check time_base.den for mpeg4
[ffmpeg.git] / libavcodec / h263.c
1 /*
2  * H263/MPEG4 backend for ffmpeg encoder and decoder
3  * Copyright (c) 2000,2001 Fabrice Bellard.
4  * H263+ support.
5  * Copyright (c) 2001 Juan J. Sierralta P.
6  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
7  *
8  * This library is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2 of the License, or (at your option) any later version.
12  *
13  * This library is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with this library; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
21  *
22  * ac prediction encoding, b-frame support, error resilience, optimizations,
23  * qpel decoding, gmc decoding, interlaced decoding, 
24  * by Michael Niedermayer <michaelni@gmx.at>
25  */
26
27 /**
28  * @file h263.c
29  * h263/mpeg4 codec.
30  */
31  
32 //#define DEBUG
33 #include <limits.h>
34
35 #include "common.h"
36 #include "dsputil.h"
37 #include "avcodec.h"
38 #include "mpegvideo.h"
39 #include "h263data.h"
40 #include "mpeg4data.h"
41
42 //#undef NDEBUG
43 //#include <assert.h>
44
45 #define INTRA_MCBPC_VLC_BITS 6
46 #define INTER_MCBPC_VLC_BITS 7
47 #define CBPY_VLC_BITS 6
48 #define MV_VLC_BITS 9
49 #define DC_VLC_BITS 9
50 #define SPRITE_TRAJ_VLC_BITS 6
51 #define MB_TYPE_B_VLC_BITS 4
52 #define TEX_VLC_BITS 9
53 #define H263_MBTYPE_B_VLC_BITS 6
54 #define CBPC_B_VLC_BITS 3
55
56 #ifdef CONFIG_ENCODERS
57 static void h263_encode_block(MpegEncContext * s, DCTELEM * block,
58                               int n);
59 static void h263p_encode_umotion(MpegEncContext * s, int val);
60 static inline void mpeg4_encode_block(MpegEncContext * s, DCTELEM * block,
61                                int n, int dc, uint8_t *scan_table, 
62                                PutBitContext *dc_pb, PutBitContext *ac_pb);
63 #endif
64
65 static int h263_decode_motion(MpegEncContext * s, int pred, int fcode);
66 static int h263p_decode_umotion(MpegEncContext * s, int pred);
67 static int h263_decode_block(MpegEncContext * s, DCTELEM * block,
68                              int n, int coded);
69 static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr);
70 static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
71                               int n, int coded, int intra, int rvlc);
72 static int mpeg4_get_block_length(MpegEncContext * s, DCTELEM * block, int n, int intra_dc, 
73                                uint8_t *scan_table);
74 static int h263_pred_dc(MpegEncContext * s, int n, uint16_t **dc_val_ptr);
75 #ifdef CONFIG_ENCODERS
76 static void mpeg4_encode_visual_object_header(MpegEncContext * s);
77 static void mpeg4_encode_vol_header(MpegEncContext * s, int vo_number, int vol_number);
78 #endif //CONFIG_ENCODERS
79 static void mpeg4_decode_sprite_trajectory(MpegEncContext * s, GetBitContext *gb);
80 static inline int ff_mpeg4_pred_dc(MpegEncContext * s, int n, int level, int *dir_ptr, int encoding);
81
82 #ifdef CONFIG_ENCODERS
83 static uint8_t uni_DCtab_lum_len[512];
84 static uint8_t uni_DCtab_chrom_len[512];
85 static uint16_t uni_DCtab_lum_bits[512];
86 static uint16_t uni_DCtab_chrom_bits[512];
87
88 static uint8_t (*mv_penalty)[MAX_MV*2+1]= NULL;
89 static uint8_t fcode_tab[MAX_MV*2+1];
90 static uint8_t umv_fcode_tab[MAX_MV*2+1];
91
92 static uint32_t uni_mpeg4_intra_rl_bits[64*64*2*2];
93 static uint8_t  uni_mpeg4_intra_rl_len [64*64*2*2];
94 static uint32_t uni_mpeg4_inter_rl_bits[64*64*2*2];
95 static uint8_t  uni_mpeg4_inter_rl_len [64*64*2*2];
96 static uint8_t  uni_h263_intra_aic_rl_len [64*64*2*2];
97 static uint8_t  uni_h263_inter_rl_len [64*64*2*2];
98 //#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128 + (run)*256 + (level))
99 //#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128*64 + (run) + (level)*64)
100 #define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128*64 + (run)*128 + (level))
101
102 /* mpeg4
103 inter
104 max level: 24/6
105 max run: 53/63
106
107 intra
108 max level: 53/16
109 max run: 29/41
110 */
111 #endif
112
113 #if 0 //3IV1 is quite rare and it slows things down a tiny bit
114 #define IS_3IV1 s->avctx->codec_tag == ff_get_fourcc("3IV1")
115 #else 
116 #define IS_3IV1 0
117 #endif
118
119 int h263_get_picture_format(int width, int height)
120 {
121     int format;
122
123     if (width == 128 && height == 96)
124         format = 1;
125     else if (width == 176 && height == 144)
126         format = 2;
127     else if (width == 352 && height == 288)
128         format = 3;
129     else if (width == 704 && height == 576)
130         format = 4;
131     else if (width == 1408 && height == 1152)
132         format = 5;
133     else
134         format = 7;
135     return format;
136 }
137
138 #ifdef CONFIG_ENCODERS
139
140 static void aspect_to_info(MpegEncContext * s, AVRational aspect){
141     int i;
142
143     if(aspect.num==0) aspect= (AVRational){1,1};
144
145     for(i=1; i<6; i++){
146         if(av_cmp_q(pixel_aspect[i], aspect) == 0){
147             s->aspect_ratio_info=i;
148             return;
149         }
150     }
151     
152     s->aspect_ratio_info= FF_ASPECT_EXTENDED;
153 }
154
155 void ff_flv_encode_picture_header(MpegEncContext * s, int picture_number)
156 {
157       int format;
158
159       align_put_bits(&s->pb);
160
161       put_bits(&s->pb, 17, 1);
162       put_bits(&s->pb, 5, (s->h263_flv-1)); /* 0: h263 escape codes 1: 11-bit escape codes */
163       put_bits(&s->pb, 8, (((int64_t)s->picture_number * 30 * s->avctx->time_base.num) / //FIXME use timestamp
164                            s->avctx->time_base.den) & 0xff); /* TemporalReference */
165       if (s->width == 352 && s->height == 288)
166         format = 2;
167       else if (s->width == 176 && s->height == 144)
168         format = 3;
169       else if (s->width == 128 && s->height == 96)
170         format = 4;
171       else if (s->width == 320 && s->height == 240)
172         format = 5;
173       else if (s->width == 160 && s->height == 120)
174         format = 6;
175       else if (s->width <= 255 && s->height <= 255)
176         format = 0; /* use 1 byte width & height */
177       else
178         format = 1; /* use 2 bytes width & height */
179       put_bits(&s->pb, 3, format); /* PictureSize */
180       if (format == 0) {
181         put_bits(&s->pb, 8, s->width);
182         put_bits(&s->pb, 8, s->height);
183       } else if (format == 1) {
184         put_bits(&s->pb, 16, s->width);
185         put_bits(&s->pb, 16, s->height);
186       }
187       put_bits(&s->pb, 2, s->pict_type == P_TYPE); /* PictureType */
188       put_bits(&s->pb, 1, 1); /* DeblockingFlag: on */
189       put_bits(&s->pb, 5, s->qscale); /* Quantizer */
190       put_bits(&s->pb, 1, 0); /* ExtraInformation */
191
192       if(s->h263_aic){
193         s->y_dc_scale_table= 
194           s->c_dc_scale_table= ff_aic_dc_scale_table;
195       }else{
196         s->y_dc_scale_table=
197           s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
198       }
199 }
200
201 void h263_encode_picture_header(MpegEncContext * s, int picture_number)
202 {
203     int format, coded_frame_rate, coded_frame_rate_base, i, temp_ref;
204     int best_clock_code=1;
205     int best_divisor=60;
206     int best_error= INT_MAX;
207    
208     if(s->h263_plus){
209         for(i=0; i<2; i++){
210             int div, error;
211             div= (s->avctx->time_base.num*1800000LL + 500LL*s->avctx->time_base.den) / ((1000LL+i)*s->avctx->time_base.den);
212             div= clip(1, div, 127);
213             error= ABS(s->avctx->time_base.num*1800000LL - (1000LL+i)*s->avctx->time_base.den*div);
214             if(error < best_error){
215                 best_error= error;
216                 best_divisor= div;
217                 best_clock_code= i;
218             }
219         }
220     }
221     s->custom_pcf= best_clock_code!=1 || best_divisor!=60;
222     coded_frame_rate= 1800000;
223     coded_frame_rate_base= (1000+best_clock_code)*best_divisor;
224
225     align_put_bits(&s->pb);
226
227     /* Update the pointer to last GOB */
228     s->ptr_lastgob = pbBufPtr(&s->pb);
229     put_bits(&s->pb, 22, 0x20); /* PSC */
230     temp_ref= s->picture_number * (int64_t)coded_frame_rate * s->avctx->time_base.num / //FIXME use timestamp
231                          (coded_frame_rate_base * (int64_t)s->avctx->time_base.den);
232     put_bits(&s->pb, 8, temp_ref & 0xff); /* TemporalReference */
233
234     put_bits(&s->pb, 1, 1);     /* marker */
235     put_bits(&s->pb, 1, 0);     /* h263 id */
236     put_bits(&s->pb, 1, 0);     /* split screen off */
237     put_bits(&s->pb, 1, 0);     /* camera  off */
238     put_bits(&s->pb, 1, 0);     /* freeze picture release off */
239     
240     format = h263_get_picture_format(s->width, s->height);
241     if (!s->h263_plus) {
242         /* H.263v1 */
243         put_bits(&s->pb, 3, format);
244         put_bits(&s->pb, 1, (s->pict_type == P_TYPE));
245         /* By now UMV IS DISABLED ON H.263v1, since the restrictions
246         of H.263v1 UMV implies to check the predicted MV after
247         calculation of the current MB to see if we're on the limits */
248         put_bits(&s->pb, 1, 0); /* Unrestricted Motion Vector: off */
249         put_bits(&s->pb, 1, 0); /* SAC: off */
250         put_bits(&s->pb, 1, s->obmc);   /* Advanced Prediction */
251         put_bits(&s->pb, 1, 0); /* only I/P frames, no PB frame */
252         put_bits(&s->pb, 5, s->qscale);
253         put_bits(&s->pb, 1, 0); /* Continuous Presence Multipoint mode: off */
254     } else {
255         int ufep=1;
256         /* H.263v2 */
257         /* H.263 Plus PTYPE */
258         
259         put_bits(&s->pb, 3, 7);
260         put_bits(&s->pb,3,ufep); /* Update Full Extended PTYPE */
261         if (format == 7)
262             put_bits(&s->pb,3,6); /* Custom Source Format */
263         else
264             put_bits(&s->pb, 3, format);
265             
266         put_bits(&s->pb,1, s->custom_pcf);
267         put_bits(&s->pb,1, s->umvplus); /* Unrestricted Motion Vector */
268         put_bits(&s->pb,1,0); /* SAC: off */
269         put_bits(&s->pb,1,s->obmc); /* Advanced Prediction Mode */
270         put_bits(&s->pb,1,s->h263_aic); /* Advanced Intra Coding */
271         put_bits(&s->pb,1,s->loop_filter); /* Deblocking Filter */
272         put_bits(&s->pb,1,s->h263_slice_structured); /* Slice Structured */
273         put_bits(&s->pb,1,0); /* Reference Picture Selection: off */
274         put_bits(&s->pb,1,0); /* Independent Segment Decoding: off */
275         put_bits(&s->pb,1,s->alt_inter_vlc); /* Alternative Inter VLC */
276         put_bits(&s->pb,1,s->modified_quant); /* Modified Quantization: */
277         put_bits(&s->pb,1,1); /* "1" to prevent start code emulation */
278         put_bits(&s->pb,3,0); /* Reserved */
279                 
280         put_bits(&s->pb, 3, s->pict_type == P_TYPE);
281                 
282         put_bits(&s->pb,1,0); /* Reference Picture Resampling: off */
283         put_bits(&s->pb,1,0); /* Reduced-Resolution Update: off */
284         put_bits(&s->pb,1,s->no_rounding); /* Rounding Type */
285         put_bits(&s->pb,2,0); /* Reserved */
286         put_bits(&s->pb,1,1); /* "1" to prevent start code emulation */
287                 
288         /* This should be here if PLUSPTYPE */
289         put_bits(&s->pb, 1, 0); /* Continuous Presence Multipoint mode: off */
290                 
291                 if (format == 7) {
292             /* Custom Picture Format (CPFMT) */
293             aspect_to_info(s, s->avctx->sample_aspect_ratio);
294
295             put_bits(&s->pb,4,s->aspect_ratio_info);
296             put_bits(&s->pb,9,(s->width >> 2) - 1);
297             put_bits(&s->pb,1,1); /* "1" to prevent start code emulation */
298             put_bits(&s->pb,9,(s->height >> 2));
299             if (s->aspect_ratio_info == FF_ASPECT_EXTENDED){
300                 put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.num);
301                 put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.den);
302             }
303         }
304         if(s->custom_pcf){
305             if(ufep){
306                 put_bits(&s->pb, 1, best_clock_code);
307                 put_bits(&s->pb, 7, best_divisor);
308             }
309             put_bits(&s->pb, 2, (temp_ref>>8)&3);
310         }
311         
312         /* Unlimited Unrestricted Motion Vectors Indicator (UUI) */
313         if (s->umvplus)
314 //            put_bits(&s->pb,1,1); /* Limited according tables of Annex D */
315 //FIXME check actual requested range
316             put_bits(&s->pb,2,1); /* unlimited */
317         if(s->h263_slice_structured)
318             put_bits(&s->pb,2,0); /* no weird submodes */
319
320         put_bits(&s->pb, 5, s->qscale);
321     }
322
323     put_bits(&s->pb, 1, 0);     /* no PEI */
324
325     if(s->h263_slice_structured){
326         put_bits(&s->pb, 1, 1);
327         
328         assert(s->mb_x == 0 && s->mb_y == 0);
329         ff_h263_encode_mba(s);
330
331         put_bits(&s->pb, 1, 1);
332     }
333
334     if(s->h263_aic){
335          s->y_dc_scale_table= 
336          s->c_dc_scale_table= ff_aic_dc_scale_table;
337     }else{
338         s->y_dc_scale_table=
339         s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
340     }
341 }
342
343 /**
344  * Encodes a group of blocks header.
345  */
346 void h263_encode_gob_header(MpegEncContext * s, int mb_line)
347 {
348     put_bits(&s->pb, 17, 1); /* GBSC */
349
350     if(s->h263_slice_structured){
351         put_bits(&s->pb, 1, 1);
352
353         ff_h263_encode_mba(s);
354
355         if(s->mb_num > 1583)
356             put_bits(&s->pb, 1, 1);
357         put_bits(&s->pb, 5, s->qscale); /* GQUANT */
358         put_bits(&s->pb, 1, 1);
359         put_bits(&s->pb, 2, s->pict_type == I_TYPE); /* GFID */
360     }else{
361         int gob_number= mb_line / s->gob_index;
362
363         put_bits(&s->pb, 5, gob_number); /* GN */
364         put_bits(&s->pb, 2, s->pict_type == I_TYPE); /* GFID */
365         put_bits(&s->pb, 5, s->qscale); /* GQUANT */
366     }
367 }
368
369 static inline int get_block_rate(MpegEncContext * s, DCTELEM block[64], int block_last_index, uint8_t scantable[64]){
370     int last=0;
371     int j;
372     int rate=0;
373
374     for(j=1; j<=block_last_index; j++){
375         const int index= scantable[j];
376         int level= block[index];
377         if(level){
378             level+= 64;
379             if((level&(~127)) == 0){
380                 if(j<block_last_index) rate+= s->intra_ac_vlc_length     [UNI_AC_ENC_INDEX(j-last-1, level)];
381                 else                   rate+= s->intra_ac_vlc_last_length[UNI_AC_ENC_INDEX(j-last-1, level)];
382             }else
383                 rate += s->ac_esc_length;
384             level-= 64;
385
386             last= j;
387         }
388     }
389     
390     return rate;
391 }
392
393 static inline int decide_ac_pred(MpegEncContext * s, DCTELEM block[6][64], int dir[6], uint8_t *st[6], int zigzag_last_index[6])
394 {
395     int score= 0;
396     int i, n;
397     int8_t * const qscale_table= s->current_picture.qscale_table;
398
399     memcpy(zigzag_last_index, s->block_last_index, sizeof(int)*6);
400     
401     for(n=0; n<6; n++){
402         int16_t *ac_val, *ac_val1;
403         
404         score -= get_block_rate(s, block[n], s->block_last_index[n], s->intra_scantable.permutated);
405
406         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
407         ac_val1= ac_val;
408         if(dir[n]){
409             const int xy= s->mb_x + s->mb_y*s->mb_stride - s->mb_stride;
410             /* top prediction */
411             ac_val-= s->block_wrap[n]*16;
412             if(s->mb_y==0 || s->qscale == qscale_table[xy] || n==2 || n==3){
413                 /* same qscale */
414                 for(i=1; i<8; i++){
415                     const int level= block[n][s->dsp.idct_permutation[i   ]];
416                     block[n][s->dsp.idct_permutation[i   ]] = level - ac_val[i+8];
417                     ac_val1[i  ]=    block[n][s->dsp.idct_permutation[i<<3]];
418                     ac_val1[i+8]= level;
419                 }
420             }else{
421                 /* different qscale, we must rescale */
422                 for(i=1; i<8; i++){
423                     const int level= block[n][s->dsp.idct_permutation[i   ]];
424                     block[n][s->dsp.idct_permutation[i   ]] = level - ROUNDED_DIV(ac_val[i + 8]*qscale_table[xy], s->qscale);
425                     ac_val1[i  ]=    block[n][s->dsp.idct_permutation[i<<3]];
426                     ac_val1[i+8]= level;
427                 }
428             }
429             st[n]= s->intra_h_scantable.permutated;
430         }else{
431             const int xy= s->mb_x-1 + s->mb_y*s->mb_stride;
432             /* left prediction */
433             ac_val-= 16;
434             if(s->mb_x==0 || s->qscale == qscale_table[xy] || n==1 || n==3){
435                 /* same qscale */
436                 for(i=1; i<8; i++){
437                     const int level= block[n][s->dsp.idct_permutation[i<<3]];
438                     block[n][s->dsp.idct_permutation[i<<3]]= level - ac_val[i];
439                     ac_val1[i  ]= level;
440                     ac_val1[i+8]=    block[n][s->dsp.idct_permutation[i   ]];
441                 }
442             }else{
443                 /* different qscale, we must rescale */
444                 for(i=1; i<8; i++){
445                     const int level= block[n][s->dsp.idct_permutation[i<<3]];
446                     block[n][s->dsp.idct_permutation[i<<3]]= level - ROUNDED_DIV(ac_val[i]*qscale_table[xy], s->qscale);
447                     ac_val1[i  ]= level;
448                     ac_val1[i+8]=    block[n][s->dsp.idct_permutation[i   ]];
449                 }
450             }
451             st[n]= s->intra_v_scantable.permutated;
452         }
453
454         for(i=63; i>0; i--) //FIXME optimize
455             if(block[n][ st[n][i] ]) break;
456         s->block_last_index[n]= i;
457
458         score += get_block_rate(s, block[n], s->block_last_index[n], st[n]);
459     }
460
461     return score < 0;
462 }
463
464 static inline void restore_ac_coeffs(MpegEncContext * s, DCTELEM block[6][64], int dir[6], uint8_t *st[6], int zigzag_last_index[6])
465 {
466     int i, n;
467     memcpy(s->block_last_index, zigzag_last_index, sizeof(int)*6);
468
469     for(n=0; n<6; n++){
470         int16_t *ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
471
472         st[n]= s->intra_scantable.permutated;
473         if(dir[n]){
474             /* top prediction */
475             for(i=1; i<8; i++){
476                 block[n][s->dsp.idct_permutation[i   ]] = ac_val[i+8];
477             }
478         }else{
479             /* left prediction */
480             for(i=1; i<8; i++){
481                 block[n][s->dsp.idct_permutation[i<<3]]= ac_val[i  ];
482             }
483         }
484     }
485 }
486
487 /**
488  * modify qscale so that encoding is acually possible in h263 (limit difference to -2..2)
489  */
490 void ff_clean_h263_qscales(MpegEncContext *s){
491     int i;
492     int8_t * const qscale_table= s->current_picture.qscale_table;
493     
494     for(i=1; i<s->mb_num; i++){
495         if(qscale_table[ s->mb_index2xy[i] ] - qscale_table[ s->mb_index2xy[i-1] ] >2)
496             qscale_table[ s->mb_index2xy[i] ]= qscale_table[ s->mb_index2xy[i-1] ]+2;
497     }
498     for(i=s->mb_num-2; i>=0; i--){
499         if(qscale_table[ s->mb_index2xy[i] ] - qscale_table[ s->mb_index2xy[i+1] ] >2)
500             qscale_table[ s->mb_index2xy[i] ]= qscale_table[ s->mb_index2xy[i+1] ]+2;
501     }
502
503     if(s->codec_id != CODEC_ID_H263P){
504         for(i=1; i<s->mb_num; i++){
505             int mb_xy= s->mb_index2xy[i];
506         
507             if(qscale_table[mb_xy] != qscale_table[s->mb_index2xy[i-1]] && (s->mb_type[mb_xy]&CANDIDATE_MB_TYPE_INTER4V)){
508                 s->mb_type[mb_xy]&= ~CANDIDATE_MB_TYPE_INTER4V;
509                 s->mb_type[mb_xy]|= CANDIDATE_MB_TYPE_INTER;
510             }
511         }
512     }
513 }
514
515 /**
516  * modify mb_type & qscale so that encoding is acually possible in mpeg4
517  */
518 void ff_clean_mpeg4_qscales(MpegEncContext *s){
519     int i;
520     int8_t * const qscale_table= s->current_picture.qscale_table;
521
522     ff_clean_h263_qscales(s);
523     
524     if(s->pict_type== B_TYPE){
525         int odd=0;
526         /* ok, come on, this isn't funny anymore, there's more code for handling this mpeg4 mess than for the actual adaptive quantization */
527         
528         for(i=0; i<s->mb_num; i++){
529             int mb_xy= s->mb_index2xy[i];
530             odd += qscale_table[mb_xy]&1;
531         }
532         
533         if(2*odd > s->mb_num) odd=1;
534         else                  odd=0;
535         
536         for(i=0; i<s->mb_num; i++){
537             int mb_xy= s->mb_index2xy[i];
538             if((qscale_table[mb_xy]&1) != odd)
539                 qscale_table[mb_xy]++;
540             if(qscale_table[mb_xy] > 31)
541                 qscale_table[mb_xy]= 31;
542         }            
543     
544         for(i=1; i<s->mb_num; i++){
545             int mb_xy= s->mb_index2xy[i];
546             if(qscale_table[mb_xy] != qscale_table[s->mb_index2xy[i-1]] && (s->mb_type[mb_xy]&CANDIDATE_MB_TYPE_DIRECT)){
547                 s->mb_type[mb_xy]&= ~CANDIDATE_MB_TYPE_DIRECT;
548                 s->mb_type[mb_xy]|= CANDIDATE_MB_TYPE_BIDIR;
549             }
550         }
551     }
552 }
553
554 #endif //CONFIG_ENCODERS
555 /**
556  *
557  * @return the mb_type
558  */
559 int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my){
560     const int mb_index= s->mb_x + s->mb_y*s->mb_stride;
561     const int colocated_mb_type= s->next_picture.mb_type[mb_index];
562     int xy= s->block_index[0];
563     uint16_t time_pp= s->pp_time;
564     uint16_t time_pb= s->pb_time;
565     int i;
566     
567     //FIXME avoid divides
568     
569     if(IS_8X8(colocated_mb_type)){
570         s->mv_type = MV_TYPE_8X8;
571         for(i=0; i<4; i++){
572             xy= s->block_index[i];
573             s->mv[0][i][0] = s->next_picture.motion_val[0][xy][0]*time_pb/time_pp + mx;
574             s->mv[0][i][1] = s->next_picture.motion_val[0][xy][1]*time_pb/time_pp + my;
575             s->mv[1][i][0] = mx ? s->mv[0][i][0] - s->next_picture.motion_val[0][xy][0]
576                                 : s->next_picture.motion_val[0][xy][0]*(time_pb - time_pp)/time_pp;
577             s->mv[1][i][1] = my ? s->mv[0][i][1] - s->next_picture.motion_val[0][xy][1] 
578                                 : s->next_picture.motion_val[0][xy][1]*(time_pb - time_pp)/time_pp;
579         }
580         return MB_TYPE_DIRECT2 | MB_TYPE_8x8 | MB_TYPE_L0L1;
581     } else if(IS_INTERLACED(colocated_mb_type)){
582         s->mv_type = MV_TYPE_FIELD;
583         for(i=0; i<2; i++){
584             int field_select= s->next_picture.ref_index[0][s->block_index[2*i]];
585             if(s->top_field_first){
586                 time_pp= s->pp_field_time - field_select + i;
587                 time_pb= s->pb_field_time - field_select + i;
588             }else{
589                 time_pp= s->pp_field_time + field_select - i;
590                 time_pb= s->pb_field_time + field_select - i;
591             }
592             s->mv[0][i][0] = s->p_field_mv_table[i][0][mb_index][0]*time_pb/time_pp + mx;
593             s->mv[0][i][1] = s->p_field_mv_table[i][0][mb_index][1]*time_pb/time_pp + my;
594             s->mv[1][i][0] = mx ? s->mv[0][i][0] - s->p_field_mv_table[i][0][mb_index][0]
595                                 : s->p_field_mv_table[i][0][mb_index][0]*(time_pb - time_pp)/time_pp;
596             s->mv[1][i][1] = my ? s->mv[0][i][1] - s->p_field_mv_table[i][0][mb_index][1] 
597                                 : s->p_field_mv_table[i][0][mb_index][1]*(time_pb - time_pp)/time_pp;
598         }
599         return MB_TYPE_DIRECT2 | MB_TYPE_16x8 | MB_TYPE_L0L1 | MB_TYPE_INTERLACED;
600     }else{
601         s->mv[0][0][0] = s->mv[0][1][0] = s->mv[0][2][0] = s->mv[0][3][0] = s->next_picture.motion_val[0][xy][0]*time_pb/time_pp + mx;
602         s->mv[0][0][1] = s->mv[0][1][1] = s->mv[0][2][1] = s->mv[0][3][1] = s->next_picture.motion_val[0][xy][1]*time_pb/time_pp + my;
603         s->mv[1][0][0] = s->mv[1][1][0] = s->mv[1][2][0] = s->mv[1][3][0] = mx ? s->mv[0][0][0] - s->next_picture.motion_val[0][xy][0]
604                             : s->next_picture.motion_val[0][xy][0]*(time_pb - time_pp)/time_pp;
605         s->mv[1][0][1] = s->mv[1][1][1] = s->mv[1][2][1] = s->mv[1][3][1] = my ? s->mv[0][0][1] - s->next_picture.motion_val[0][xy][1] 
606                             : s->next_picture.motion_val[0][xy][1]*(time_pb - time_pp)/time_pp;
607         if((s->avctx->workaround_bugs & FF_BUG_DIRECT_BLOCKSIZE) || !s->quarter_sample)
608             s->mv_type= MV_TYPE_16X16;
609         else
610             s->mv_type= MV_TYPE_8X8;
611         return MB_TYPE_DIRECT2 | MB_TYPE_16x16 | MB_TYPE_L0L1; //Note see prev line
612     }
613 }
614
615 void ff_h263_update_motion_val(MpegEncContext * s){
616     const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
617                //FIXME a lot of that is only needed for !low_delay
618     const int wrap = s->b8_stride;
619     const int xy = s->block_index[0];
620     
621     s->current_picture.mbskip_table[mb_xy]= s->mb_skipped; 
622
623     if(s->mv_type != MV_TYPE_8X8){
624         int motion_x, motion_y;
625         if (s->mb_intra) {
626             motion_x = 0;
627             motion_y = 0;
628         } else if (s->mv_type == MV_TYPE_16X16) {
629             motion_x = s->mv[0][0][0];
630             motion_y = s->mv[0][0][1];
631         } else /*if (s->mv_type == MV_TYPE_FIELD)*/ {
632             int i;
633             motion_x = s->mv[0][0][0] + s->mv[0][1][0];
634             motion_y = s->mv[0][0][1] + s->mv[0][1][1];
635             motion_x = (motion_x>>1) | (motion_x&1);
636             for(i=0; i<2; i++){
637                 s->p_field_mv_table[i][0][mb_xy][0]= s->mv[0][i][0];
638                 s->p_field_mv_table[i][0][mb_xy][1]= s->mv[0][i][1];
639             }
640             s->current_picture.ref_index[0][xy           ]=
641             s->current_picture.ref_index[0][xy        + 1]= s->field_select[0][0];
642             s->current_picture.ref_index[0][xy + wrap    ]=
643             s->current_picture.ref_index[0][xy + wrap + 1]= s->field_select[0][1];
644         }
645
646         /* no update if 8X8 because it has been done during parsing */
647         s->current_picture.motion_val[0][xy][0] = motion_x;
648         s->current_picture.motion_val[0][xy][1] = motion_y;
649         s->current_picture.motion_val[0][xy + 1][0] = motion_x;
650         s->current_picture.motion_val[0][xy + 1][1] = motion_y;
651         s->current_picture.motion_val[0][xy + wrap][0] = motion_x;
652         s->current_picture.motion_val[0][xy + wrap][1] = motion_y;
653         s->current_picture.motion_val[0][xy + 1 + wrap][0] = motion_x;
654         s->current_picture.motion_val[0][xy + 1 + wrap][1] = motion_y;
655     }
656
657     if(s->encoding){ //FIXME encoding MUST be cleaned up
658         if (s->mv_type == MV_TYPE_8X8) 
659             s->current_picture.mb_type[mb_xy]= MB_TYPE_L0 | MB_TYPE_8x8;
660         else if(s->mb_intra)
661             s->current_picture.mb_type[mb_xy]= MB_TYPE_INTRA;
662         else
663             s->current_picture.mb_type[mb_xy]= MB_TYPE_L0 | MB_TYPE_16x16;
664     }
665 }
666
667 #ifdef CONFIG_ENCODERS
668
669 static inline int h263_get_motion_length(MpegEncContext * s, int val, int f_code){
670     int l, bit_size, code;
671
672     if (val == 0) {
673         return mvtab[0][1];
674     } else {
675         bit_size = f_code - 1;
676         /* modulo encoding */
677         l= INT_BIT - 6 - bit_size;
678         val = (val<<l)>>l;
679         val--;
680         code = (val >> bit_size) + 1;
681
682         return mvtab[code][1] + 1 + bit_size;
683     }
684 }
685
686 static inline void ff_h263_encode_motion_vector(MpegEncContext * s, int x, int y, int f_code){
687     if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
688         skip_put_bits(&s->pb, 
689             h263_get_motion_length(s, x, f_code)
690            +h263_get_motion_length(s, y, f_code));
691     }else{
692         ff_h263_encode_motion(s, x, f_code);
693         ff_h263_encode_motion(s, y, f_code);
694     }
695 }
696
697 static inline int get_p_cbp(MpegEncContext * s,
698                       DCTELEM block[6][64],
699                       int motion_x, int motion_y){
700     int cbp, i;
701
702     if(s->flags & CODEC_FLAG_CBP_RD){
703         int best_cbpy_score= INT_MAX;
704         int best_cbpc_score= INT_MAX;
705         int cbpc = (-1), cbpy= (-1);
706         const int offset= (s->mv_type==MV_TYPE_16X16 ? 0 : 16) + (s->dquant ? 8 : 0);
707         const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
708
709         for(i=0; i<4; i++){
710             int score= inter_MCBPC_bits[i + offset] * lambda;
711             if(i&1) score += s->coded_score[5];
712             if(i&2) score += s->coded_score[4];
713
714             if(score < best_cbpc_score){
715                 best_cbpc_score= score;
716                 cbpc= i;
717             }
718         }
719
720         for(i=0; i<16; i++){
721             int score= cbpy_tab[i ^ 0xF][1] * lambda;
722             if(i&1) score += s->coded_score[3];
723             if(i&2) score += s->coded_score[2];
724             if(i&4) score += s->coded_score[1];
725             if(i&8) score += s->coded_score[0];
726
727             if(score < best_cbpy_score){
728                 best_cbpy_score= score;
729                 cbpy= i;
730             }
731         }
732         cbp= cbpc + 4*cbpy;
733         if ((motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16){
734             if(best_cbpy_score + best_cbpc_score + 2*lambda >= 0)
735                 cbp= 0;
736         }
737
738         for (i = 0; i < 6; i++) {
739             if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){
740                 s->block_last_index[i]= -1;
741                 memset(s->block[i], 0, sizeof(DCTELEM)*64);
742             }
743         }
744     }else{
745         cbp= 0;
746         for (i = 0; i < 6; i++) {
747             if (s->block_last_index[i] >= 0)
748                 cbp |= 1 << (5 - i);
749         }
750     }
751     return cbp;
752 }
753
754 static inline int get_b_cbp(MpegEncContext * s, DCTELEM block[6][64],
755                             int motion_x, int motion_y, int mb_type){
756     int cbp=0, i;
757
758     if(s->flags & CODEC_FLAG_CBP_RD){
759         int score=0;
760         const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
761         
762         for(i=0; i<6; i++){
763             if(s->coded_score[i] < 0){
764                 score += s->coded_score[i];
765                 cbp |= 1 << (5 - i);
766             }
767         }
768         
769         if(cbp){
770             int zero_score= -6;
771             if ((motion_x | motion_y | s->dquant | mb_type) == 0){
772                 zero_score-= 4; //2*MV + mb_type + cbp bit
773             }
774
775             zero_score*= lambda;
776             if(zero_score <= score){
777                 cbp=0;
778             }
779         }
780
781         for (i = 0; i < 6; i++) {
782             if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){
783                 s->block_last_index[i]= -1;
784                 memset(s->block[i], 0, sizeof(DCTELEM)*64);
785             }
786         }
787     }else{
788         for (i = 0; i < 6; i++) {
789             if (s->block_last_index[i] >= 0)
790                 cbp |= 1 << (5 - i);
791         }
792     }
793     return cbp;
794 }
795
796 static inline void mpeg4_encode_blocks(MpegEncContext * s, DCTELEM block[6][64], int intra_dc[6], 
797                                uint8_t **scan_table, PutBitContext *dc_pb, PutBitContext *ac_pb){
798     int i;
799     
800     if(scan_table){
801         if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
802             for (i = 0; i < 6; i++) {
803                 skip_put_bits(&s->pb, mpeg4_get_block_length(s, block[i], i, intra_dc[i], scan_table[i]));
804             }
805         }else{
806             /* encode each block */
807             for (i = 0; i < 6; i++) {
808                 mpeg4_encode_block(s, block[i], i, intra_dc[i], scan_table[i], dc_pb, ac_pb);
809             }
810         }
811     }else{
812         if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
813             for (i = 0; i < 6; i++) {
814                 skip_put_bits(&s->pb, mpeg4_get_block_length(s, block[i], i, 0, s->intra_scantable.permutated));
815             }
816         }else{
817             /* encode each block */
818             for (i = 0; i < 6; i++) {
819                 mpeg4_encode_block(s, block[i], i, 0, s->intra_scantable.permutated, dc_pb, ac_pb);
820             }
821         }
822     }
823 }
824
825 void mpeg4_encode_mb(MpegEncContext * s,
826                     DCTELEM block[6][64],
827                     int motion_x, int motion_y)
828 {
829     int cbpc, cbpy, pred_x, pred_y;
830     PutBitContext * const pb2    = s->data_partitioning                         ? &s->pb2    : &s->pb;
831     PutBitContext * const tex_pb = s->data_partitioning && s->pict_type!=B_TYPE ? &s->tex_pb : &s->pb;
832     PutBitContext * const dc_pb  = s->data_partitioning && s->pict_type!=I_TYPE ? &s->pb2    : &s->pb;
833     const int interleaved_stats= (s->flags&CODEC_FLAG_PASS1) && !s->data_partitioning ? 1 : 0;
834     const int dquant_code[5]= {1,0,9,2,3};
835     
836     //    printf("**mb x=%d y=%d\n", s->mb_x, s->mb_y);
837     if (!s->mb_intra) {
838         int i, cbp;
839         
840         if(s->pict_type==B_TYPE){
841             static const int mb_type_table[8]= {-1, 2, 3, 1,-1,-1,-1, 0}; /* convert from mv_dir to type */
842             int mb_type=  mb_type_table[s->mv_dir];
843
844             if(s->mb_x==0){
845                 for(i=0; i<2; i++){
846                     s->last_mv[i][0][0]= 
847                     s->last_mv[i][0][1]= 
848                     s->last_mv[i][1][0]= 
849                     s->last_mv[i][1][1]= 0;
850                 }
851             }
852             
853             assert(s->dquant>=-2 && s->dquant<=2);
854             assert((s->dquant&1)==0);
855             assert(mb_type>=0);
856
857             /* nothing to do if this MB was skipped in the next P Frame */
858             if(s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]){ //FIXME avoid DCT & ...
859                 s->skip_count++;
860                 s->mv[0][0][0]= 
861                 s->mv[0][0][1]= 
862                 s->mv[1][0][0]= 
863                 s->mv[1][0][1]= 0;
864                 s->mv_dir= MV_DIR_FORWARD; //doesn't matter
865                 s->qscale -= s->dquant;
866 //                s->mb_skipped=1;
867
868                 return;
869             }
870             
871             cbp= get_b_cbp(s, block, motion_x, motion_y, mb_type);
872             
873             if ((cbp | motion_x | motion_y | mb_type) ==0) {
874                 /* direct MB with MV={0,0} */
875                 assert(s->dquant==0);
876                 
877                 put_bits(&s->pb, 1, 1); /* mb not coded modb1=1 */
878
879                 if(interleaved_stats){
880                     s->misc_bits++;
881                     s->last_bits++;
882                 }
883                 s->skip_count++;
884                 return;
885             }
886             
887             put_bits(&s->pb, 1, 0);     /* mb coded modb1=0 */
888             put_bits(&s->pb, 1, cbp ? 0 : 1); /* modb2 */ //FIXME merge
889             put_bits(&s->pb, mb_type+1, 1); // this table is so simple that we don't need it :)
890             if(cbp) put_bits(&s->pb, 6, cbp);
891             
892             if(cbp && mb_type){
893                 if(s->dquant)
894                     put_bits(&s->pb, 2, (s->dquant>>2)+3);
895                 else
896                     put_bits(&s->pb, 1, 0);
897             }else
898                 s->qscale -= s->dquant;
899             
900             if(!s->progressive_sequence){
901                 if(cbp)
902                     put_bits(&s->pb, 1, s->interlaced_dct);
903                 if(mb_type) // not direct mode
904                     put_bits(&s->pb, 1, s->mv_type == MV_TYPE_FIELD);
905             }
906
907             if(interleaved_stats){
908                 s->misc_bits+= get_bits_diff(s);
909             }
910
911             if(mb_type == 0){
912                 assert(s->mv_dir & MV_DIRECT);
913                 ff_h263_encode_motion_vector(s, motion_x, motion_y, 1);
914                 s->b_count++;
915                 s->f_count++;
916             }else{
917                 assert(mb_type > 0 && mb_type < 4);
918                 if(s->mv_type != MV_TYPE_FIELD){
919                     if(s->mv_dir & MV_DIR_FORWARD){
920                         ff_h263_encode_motion_vector(s, s->mv[0][0][0] - s->last_mv[0][0][0],
921                                                         s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
922                         s->last_mv[0][0][0]= s->last_mv[0][1][0]= s->mv[0][0][0];
923                         s->last_mv[0][0][1]= s->last_mv[0][1][1]= s->mv[0][0][1];
924                         s->f_count++;
925                     }
926                     if(s->mv_dir & MV_DIR_BACKWARD){
927                         ff_h263_encode_motion_vector(s, s->mv[1][0][0] - s->last_mv[1][0][0],
928                                                         s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
929                         s->last_mv[1][0][0]= s->last_mv[1][1][0]= s->mv[1][0][0];
930                         s->last_mv[1][0][1]= s->last_mv[1][1][1]= s->mv[1][0][1];
931                         s->b_count++;
932                     }
933                 }else{
934                     if(s->mv_dir & MV_DIR_FORWARD){
935                         put_bits(&s->pb, 1, s->field_select[0][0]);
936                         put_bits(&s->pb, 1, s->field_select[0][1]);
937                     }
938                     if(s->mv_dir & MV_DIR_BACKWARD){
939                         put_bits(&s->pb, 1, s->field_select[1][0]);
940                         put_bits(&s->pb, 1, s->field_select[1][1]);
941                     }
942                     if(s->mv_dir & MV_DIR_FORWARD){
943                         for(i=0; i<2; i++){
944                             ff_h263_encode_motion_vector(s, s->mv[0][i][0] - s->last_mv[0][i][0]  ,
945                                                             s->mv[0][i][1] - s->last_mv[0][i][1]/2, s->f_code);
946                             s->last_mv[0][i][0]= s->mv[0][i][0];
947                             s->last_mv[0][i][1]= s->mv[0][i][1]*2;
948                         }
949                         s->f_count++;
950                     }
951                     if(s->mv_dir & MV_DIR_BACKWARD){
952                         for(i=0; i<2; i++){
953                             ff_h263_encode_motion_vector(s, s->mv[1][i][0] - s->last_mv[1][i][0]  ,
954                                                             s->mv[1][i][1] - s->last_mv[1][i][1]/2, s->b_code);
955                             s->last_mv[1][i][0]= s->mv[1][i][0];
956                             s->last_mv[1][i][1]= s->mv[1][i][1]*2;
957                         }
958                         s->b_count++;
959                     }
960                 }
961             }
962
963             if(interleaved_stats){
964                 s->mv_bits+= get_bits_diff(s);
965             }
966
967             mpeg4_encode_blocks(s, block, NULL, NULL, NULL, &s->pb);
968
969             if(interleaved_stats){
970                 s->p_tex_bits+= get_bits_diff(s);
971             }
972
973         }else{ /* s->pict_type==B_TYPE */
974             cbp= get_p_cbp(s, block, motion_x, motion_y);
975         
976             if ((cbp | motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16) {
977                 /* check if the B frames can skip it too, as we must skip it if we skip here 
978                    why didn't they just compress the skip-mb bits instead of reusing them ?! */
979                 if(s->max_b_frames>0){
980                     int i;
981                     int x,y, offset;
982                     uint8_t *p_pic;
983
984                     x= s->mb_x*16;
985                     y= s->mb_y*16;
986                     if(x+16 > s->width)  x= s->width-16;
987                     if(y+16 > s->height) y= s->height-16;
988
989                     offset= x + y*s->linesize;
990                     p_pic= s->new_picture.data[0] + offset;
991                     
992                     s->mb_skipped=1;
993                     for(i=0; i<s->max_b_frames; i++){
994                         uint8_t *b_pic;
995                         int diff;
996                         Picture *pic= s->reordered_input_picture[i+1];
997
998                         if(pic==NULL || pic->pict_type!=B_TYPE) break;
999
1000                         b_pic= pic->data[0] + offset + 16; //FIXME +16
1001                         diff= s->dsp.sad[0](NULL, p_pic, b_pic, s->linesize, 16);
1002                         if(diff>s->qscale*70){ //FIXME check that 70 is optimal
1003                             s->mb_skipped=0;
1004                             break;
1005                         }
1006                     }
1007                 }else
1008                     s->mb_skipped=1; 
1009
1010                 if(s->mb_skipped==1){
1011                     /* skip macroblock */
1012                     put_bits(&s->pb, 1, 1);
1013
1014                     if(interleaved_stats){
1015                         s->misc_bits++;
1016                         s->last_bits++;
1017                     }
1018                     s->skip_count++;
1019                     
1020                     return;
1021                 }
1022             }
1023
1024             put_bits(&s->pb, 1, 0);     /* mb coded */
1025             cbpc = cbp & 3;
1026             cbpy = cbp >> 2;
1027             cbpy ^= 0xf;
1028             if(s->mv_type==MV_TYPE_16X16){
1029                 if(s->dquant) cbpc+= 8;
1030                 put_bits(&s->pb,
1031                         inter_MCBPC_bits[cbpc],
1032                         inter_MCBPC_code[cbpc]);
1033
1034                 put_bits(pb2, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
1035                 if(s->dquant)
1036                     put_bits(pb2, 2, dquant_code[s->dquant+2]);
1037
1038                 if(!s->progressive_sequence){
1039                     if(cbp)
1040                         put_bits(pb2, 1, s->interlaced_dct);
1041                     put_bits(pb2, 1, 0);
1042                 }
1043                     
1044                 if(interleaved_stats){
1045                     s->misc_bits+= get_bits_diff(s);
1046                 }
1047
1048                 /* motion vectors: 16x16 mode */
1049                 h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1050             
1051                 ff_h263_encode_motion_vector(s, motion_x - pred_x,
1052                                                 motion_y - pred_y, s->f_code);
1053             }else if(s->mv_type==MV_TYPE_FIELD){
1054                 if(s->dquant) cbpc+= 8;
1055                 put_bits(&s->pb,
1056                         inter_MCBPC_bits[cbpc],
1057                         inter_MCBPC_code[cbpc]);
1058
1059                 put_bits(pb2, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
1060                 if(s->dquant)
1061                     put_bits(pb2, 2, dquant_code[s->dquant+2]);
1062
1063                 assert(!s->progressive_sequence);
1064                 if(cbp)
1065                     put_bits(pb2, 1, s->interlaced_dct);
1066                 put_bits(pb2, 1, 1);
1067                     
1068                 if(interleaved_stats){
1069                     s->misc_bits+= get_bits_diff(s);
1070                 }
1071
1072                 /* motion vectors: 16x8 interlaced mode */
1073                 h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1074                 pred_y /=2;
1075                 
1076                 put_bits(&s->pb, 1, s->field_select[0][0]);
1077                 put_bits(&s->pb, 1, s->field_select[0][1]);
1078             
1079                 ff_h263_encode_motion_vector(s, s->mv[0][0][0] - pred_x,
1080                                                 s->mv[0][0][1] - pred_y, s->f_code);
1081                 ff_h263_encode_motion_vector(s, s->mv[0][1][0] - pred_x,
1082                                                 s->mv[0][1][1] - pred_y, s->f_code);
1083             }else{
1084                 assert(s->mv_type==MV_TYPE_8X8);
1085                 put_bits(&s->pb,
1086                         inter_MCBPC_bits[cbpc+16],
1087                         inter_MCBPC_code[cbpc+16]);
1088                 put_bits(pb2, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
1089
1090                 if(!s->progressive_sequence){
1091                     if(cbp)
1092                         put_bits(pb2, 1, s->interlaced_dct);
1093                 }
1094     
1095                 if(interleaved_stats){
1096                     s->misc_bits+= get_bits_diff(s);
1097                 }
1098
1099                 for(i=0; i<4; i++){
1100                     /* motion vectors: 8x8 mode*/
1101                     h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1102
1103                     ff_h263_encode_motion_vector(s, s->current_picture.motion_val[0][ s->block_index[i] ][0] - pred_x,
1104                                                     s->current_picture.motion_val[0][ s->block_index[i] ][1] - pred_y, s->f_code);
1105                 }
1106             }
1107
1108             if(interleaved_stats){ 
1109                 s->mv_bits+= get_bits_diff(s);
1110             }
1111
1112             mpeg4_encode_blocks(s, block, NULL, NULL, NULL, tex_pb);
1113
1114             if(interleaved_stats){
1115                 s->p_tex_bits+= get_bits_diff(s);
1116             }
1117             s->f_count++;
1118         }
1119     } else {
1120         int cbp;
1121         int dc_diff[6];   //dc values with the dc prediction subtracted 
1122         int dir[6];  //prediction direction
1123         int zigzag_last_index[6];
1124         uint8_t *scan_table[6];
1125         int i;
1126
1127         for(i=0; i<6; i++){
1128             dc_diff[i]= ff_mpeg4_pred_dc(s, i, block[i][0], &dir[i], 1);
1129         }
1130
1131         if(s->flags & CODEC_FLAG_AC_PRED){
1132             s->ac_pred= decide_ac_pred(s, block, dir, scan_table, zigzag_last_index);
1133             if(!s->ac_pred)
1134                 restore_ac_coeffs(s, block, dir, scan_table, zigzag_last_index);
1135         }else{
1136             for(i=0; i<6; i++)
1137                 scan_table[i]= s->intra_scantable.permutated;
1138         }
1139
1140         /* compute cbp */
1141         cbp = 0;
1142         for (i = 0; i < 6; i++) {
1143             if (s->block_last_index[i] >= 1)
1144                 cbp |= 1 << (5 - i);
1145         }
1146
1147         cbpc = cbp & 3;
1148         if (s->pict_type == I_TYPE) {
1149             if(s->dquant) cbpc+=4;
1150             put_bits(&s->pb,
1151                 intra_MCBPC_bits[cbpc],
1152                 intra_MCBPC_code[cbpc]);
1153         } else {
1154             if(s->dquant) cbpc+=8;
1155             put_bits(&s->pb, 1, 0);     /* mb coded */
1156             put_bits(&s->pb,
1157                 inter_MCBPC_bits[cbpc + 4],
1158                 inter_MCBPC_code[cbpc + 4]);
1159         }
1160         put_bits(pb2, 1, s->ac_pred);
1161         cbpy = cbp >> 2;
1162         put_bits(pb2, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
1163         if(s->dquant)
1164             put_bits(dc_pb, 2, dquant_code[s->dquant+2]);
1165
1166         if(!s->progressive_sequence){
1167             put_bits(dc_pb, 1, s->interlaced_dct);
1168         }
1169
1170         if(interleaved_stats){
1171             s->misc_bits+= get_bits_diff(s);
1172         }
1173
1174         mpeg4_encode_blocks(s, block, dc_diff, scan_table, dc_pb, tex_pb);
1175
1176         if(interleaved_stats){
1177             s->i_tex_bits+= get_bits_diff(s);
1178         }
1179         s->i_count++;
1180
1181         /* restore ac coeffs & last_index stuff if we messed them up with the prediction */
1182         if(s->ac_pred)
1183             restore_ac_coeffs(s, block, dir, scan_table, zigzag_last_index);
1184     }
1185 }
1186
1187 void h263_encode_mb(MpegEncContext * s,
1188                     DCTELEM block[6][64],
1189                     int motion_x, int motion_y)
1190 {
1191     int cbpc, cbpy, i, cbp, pred_x, pred_y;
1192     int16_t pred_dc;
1193     int16_t rec_intradc[6];
1194     uint16_t *dc_ptr[6];
1195     const int interleaved_stats= (s->flags&CODEC_FLAG_PASS1);
1196     const int dquant_code[5]= {1,0,9,2,3};
1197            
1198     //printf("**mb x=%d y=%d\n", s->mb_x, s->mb_y);
1199     if (!s->mb_intra) {
1200         /* compute cbp */
1201         cbp= get_p_cbp(s, block, motion_x, motion_y);
1202
1203         if ((cbp | motion_x | motion_y | s->dquant | (s->mv_type - MV_TYPE_16X16)) == 0) {
1204             /* skip macroblock */
1205             put_bits(&s->pb, 1, 1);
1206             if(interleaved_stats){
1207                 s->misc_bits++;
1208                 s->last_bits++;
1209             }
1210             s->skip_count++;
1211
1212             return;
1213         }
1214         put_bits(&s->pb, 1, 0); /* mb coded */
1215         
1216         cbpc = cbp & 3;
1217         cbpy = cbp >> 2;
1218         if(s->alt_inter_vlc==0 || cbpc!=3)
1219             cbpy ^= 0xF;
1220         if(s->dquant) cbpc+= 8;
1221         if(s->mv_type==MV_TYPE_16X16){
1222             put_bits(&s->pb,
1223                     inter_MCBPC_bits[cbpc],
1224                     inter_MCBPC_code[cbpc]);
1225
1226             put_bits(&s->pb, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
1227             if(s->dquant)
1228                 put_bits(&s->pb, 2, dquant_code[s->dquant+2]);
1229                 
1230             if(interleaved_stats){
1231                 s->misc_bits+= get_bits_diff(s);
1232             }
1233
1234             /* motion vectors: 16x16 mode */
1235             h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1236             
1237             if (!s->umvplus) {  
1238                 ff_h263_encode_motion_vector(s, motion_x - pred_x,
1239                                                 motion_y - pred_y, 1);
1240             }
1241             else {
1242                 h263p_encode_umotion(s, motion_x - pred_x);
1243                 h263p_encode_umotion(s, motion_y - pred_y);
1244                 if (((motion_x - pred_x) == 1) && ((motion_y - pred_y) == 1))
1245                     /* To prevent Start Code emulation */
1246                     put_bits(&s->pb,1,1);
1247             }
1248         }else{
1249             put_bits(&s->pb,
1250                     inter_MCBPC_bits[cbpc+16],
1251                     inter_MCBPC_code[cbpc+16]);
1252             put_bits(&s->pb, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
1253             if(s->dquant)
1254                 put_bits(&s->pb, 2, dquant_code[s->dquant+2]);
1255
1256             if(interleaved_stats){
1257                 s->misc_bits+= get_bits_diff(s);
1258             }
1259
1260             for(i=0; i<4; i++){
1261                 /* motion vectors: 8x8 mode*/
1262                 h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1263
1264                 motion_x= s->current_picture.motion_val[0][ s->block_index[i] ][0];
1265                 motion_y= s->current_picture.motion_val[0][ s->block_index[i] ][1];
1266                 if (!s->umvplus) {  
1267                     ff_h263_encode_motion_vector(s, motion_x - pred_x,
1268                                                     motion_y - pred_y, 1);
1269                 }
1270                 else {
1271                     h263p_encode_umotion(s, motion_x - pred_x);
1272                     h263p_encode_umotion(s, motion_y - pred_y);
1273                     if (((motion_x - pred_x) == 1) && ((motion_y - pred_y) == 1))
1274                         /* To prevent Start Code emulation */
1275                         put_bits(&s->pb,1,1);
1276                 }
1277             }
1278         }
1279
1280         if(interleaved_stats){
1281             s->mv_bits+= get_bits_diff(s);
1282         }
1283     } else {
1284         assert(s->mb_intra);
1285         
1286         cbp = 0;
1287         if (s->h263_aic) {
1288             /* Predict DC */
1289             for(i=0; i<6; i++) {
1290                 int16_t level = block[i][0];
1291                 int scale;
1292                 
1293                 if(i<4) scale= s->y_dc_scale;
1294                 else    scale= s->c_dc_scale;
1295
1296                 pred_dc = h263_pred_dc(s, i, &dc_ptr[i]);
1297                 level -= pred_dc;
1298                 /* Quant */
1299                 if (level >= 0)
1300                     level = (level + (scale>>1))/scale;
1301                 else
1302                     level = (level - (scale>>1))/scale;
1303                     
1304                 /* AIC can change CBP */
1305                 if (level == 0 && s->block_last_index[i] == 0)
1306                     s->block_last_index[i] = -1;
1307
1308                 if(!s->modified_quant){
1309                     if (level < -127)
1310                         level = -127;
1311                     else if (level > 127)
1312                         level = 127;
1313                 }
1314
1315                 block[i][0] = level;
1316                 /* Reconstruction */ 
1317                 rec_intradc[i] = scale*level + pred_dc;
1318                 /* Oddify */
1319                 rec_intradc[i] |= 1;
1320                 //if ((rec_intradc[i] % 2) == 0)
1321                 //    rec_intradc[i]++;
1322                 /* Clipping */
1323                 if (rec_intradc[i] < 0)
1324                     rec_intradc[i] = 0;
1325                 else if (rec_intradc[i] > 2047)
1326                     rec_intradc[i] = 2047;
1327                                 
1328                 /* Update AC/DC tables */
1329                 *dc_ptr[i] = rec_intradc[i];
1330                 if (s->block_last_index[i] >= 0)
1331                     cbp |= 1 << (5 - i);
1332             }
1333         }else{
1334             for(i=0; i<6; i++) {
1335                 /* compute cbp */
1336                 if (s->block_last_index[i] >= 1)
1337                     cbp |= 1 << (5 - i);
1338             }
1339         }
1340
1341         cbpc = cbp & 3;
1342         if (s->pict_type == I_TYPE) {
1343             if(s->dquant) cbpc+=4;
1344             put_bits(&s->pb,
1345                 intra_MCBPC_bits[cbpc],
1346                 intra_MCBPC_code[cbpc]);
1347         } else {
1348             if(s->dquant) cbpc+=8;
1349             put_bits(&s->pb, 1, 0);     /* mb coded */
1350             put_bits(&s->pb,
1351                 inter_MCBPC_bits[cbpc + 4],
1352                 inter_MCBPC_code[cbpc + 4]);
1353         }
1354         if (s->h263_aic) {
1355             /* XXX: currently, we do not try to use ac prediction */
1356             put_bits(&s->pb, 1, 0);     /* no AC prediction */
1357         }
1358         cbpy = cbp >> 2;
1359         put_bits(&s->pb, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
1360         if(s->dquant)
1361             put_bits(&s->pb, 2, dquant_code[s->dquant+2]);
1362
1363         if(interleaved_stats){
1364             s->misc_bits+= get_bits_diff(s);
1365         }
1366     }
1367
1368     for(i=0; i<6; i++) {
1369         /* encode each block */
1370         h263_encode_block(s, block[i], i);
1371     
1372         /* Update INTRADC for decoding */
1373         if (s->h263_aic && s->mb_intra) {
1374             block[i][0] = rec_intradc[i];
1375             
1376         }
1377     }
1378
1379     if(interleaved_stats){
1380         if (!s->mb_intra) {
1381             s->p_tex_bits+= get_bits_diff(s);
1382             s->f_count++;
1383         }else{
1384             s->i_tex_bits+= get_bits_diff(s);
1385             s->i_count++;
1386         }
1387     }
1388 }
1389 #endif
1390
1391 void ff_h263_loop_filter(MpegEncContext * s){
1392     int qp_c;
1393     const int linesize  = s->linesize;
1394     const int uvlinesize= s->uvlinesize;
1395     const int xy = s->mb_y * s->mb_stride + s->mb_x;
1396     uint8_t *dest_y = s->dest[0];
1397     uint8_t *dest_cb= s->dest[1];
1398     uint8_t *dest_cr= s->dest[2];
1399     
1400 //    if(s->pict_type==B_TYPE && !s->readable) return;
1401
1402     /*
1403        Diag Top
1404        Left Center
1405     */
1406     if(!IS_SKIP(s->current_picture.mb_type[xy])){
1407         qp_c= s->qscale;
1408         s->dsp.h263_v_loop_filter(dest_y+8*linesize  , linesize, qp_c);
1409         s->dsp.h263_v_loop_filter(dest_y+8*linesize+8, linesize, qp_c);
1410     }else
1411         qp_c= 0;
1412
1413     if(s->mb_y){
1414         int qp_dt, qp_t, qp_tc;
1415
1416         if(IS_SKIP(s->current_picture.mb_type[xy-s->mb_stride]))
1417             qp_t=0;
1418         else 
1419             qp_t= s->current_picture.qscale_table[xy-s->mb_stride];
1420
1421         if(qp_c) 
1422             qp_tc= qp_c;
1423         else
1424             qp_tc= qp_t;
1425             
1426         if(qp_tc){
1427             const int chroma_qp= s->chroma_qscale_table[qp_tc];
1428             s->dsp.h263_v_loop_filter(dest_y  ,   linesize, qp_tc);
1429             s->dsp.h263_v_loop_filter(dest_y+8,   linesize, qp_tc);
1430         
1431             s->dsp.h263_v_loop_filter(dest_cb , uvlinesize, chroma_qp);
1432             s->dsp.h263_v_loop_filter(dest_cr , uvlinesize, chroma_qp);
1433         }
1434         
1435         if(qp_t)
1436             s->dsp.h263_h_loop_filter(dest_y-8*linesize+8  ,   linesize, qp_t);
1437         
1438         if(s->mb_x){
1439             if(qp_t || IS_SKIP(s->current_picture.mb_type[xy-1-s->mb_stride]))
1440                 qp_dt= qp_t;
1441             else
1442                 qp_dt= s->current_picture.qscale_table[xy-1-s->mb_stride];
1443             
1444             if(qp_dt){
1445                 const int chroma_qp= s->chroma_qscale_table[qp_dt];
1446                 s->dsp.h263_h_loop_filter(dest_y -8*linesize  ,   linesize, qp_dt);
1447                 s->dsp.h263_h_loop_filter(dest_cb-8*uvlinesize, uvlinesize, chroma_qp);
1448                 s->dsp.h263_h_loop_filter(dest_cr-8*uvlinesize, uvlinesize, chroma_qp);
1449             }
1450         }
1451     }
1452
1453     if(qp_c){
1454         s->dsp.h263_h_loop_filter(dest_y +8,   linesize, qp_c);
1455         if(s->mb_y + 1 == s->mb_height)
1456             s->dsp.h263_h_loop_filter(dest_y+8*linesize+8,   linesize, qp_c);
1457     }
1458     
1459     if(s->mb_x){
1460         int qp_lc;
1461         if(qp_c || IS_SKIP(s->current_picture.mb_type[xy-1]))
1462             qp_lc= qp_c;
1463         else
1464             qp_lc= s->current_picture.qscale_table[xy-1];
1465         
1466         if(qp_lc){
1467             s->dsp.h263_h_loop_filter(dest_y,   linesize, qp_lc);
1468             if(s->mb_y + 1 == s->mb_height){
1469                 const int chroma_qp= s->chroma_qscale_table[qp_lc];
1470                 s->dsp.h263_h_loop_filter(dest_y +8*  linesize,   linesize, qp_lc);
1471                 s->dsp.h263_h_loop_filter(dest_cb             , uvlinesize, chroma_qp);
1472                 s->dsp.h263_h_loop_filter(dest_cr             , uvlinesize, chroma_qp);
1473             }
1474         }
1475     }
1476 }
1477
1478 static int h263_pred_dc(MpegEncContext * s, int n, uint16_t **dc_val_ptr)
1479 {
1480     int x, y, wrap, a, c, pred_dc, scale;
1481     int16_t *dc_val, *ac_val;
1482
1483     /* find prediction */
1484     if (n < 4) {
1485         x = 2 * s->mb_x + (n & 1);
1486         y = 2 * s->mb_y + ((n & 2) >> 1);
1487         wrap = s->b8_stride;
1488         dc_val = s->dc_val[0];
1489         ac_val = s->ac_val[0][0];
1490         scale = s->y_dc_scale;
1491     } else {
1492         x = s->mb_x;
1493         y = s->mb_y;
1494         wrap = s->mb_stride;
1495         dc_val = s->dc_val[n - 4 + 1];
1496         ac_val = s->ac_val[n - 4 + 1][0];
1497         scale = s->c_dc_scale;
1498     }
1499     /* B C
1500      * A X 
1501      */
1502     a = dc_val[(x - 1) + (y) * wrap];
1503     c = dc_val[(x) + (y - 1) * wrap];
1504     
1505     /* No prediction outside GOB boundary */
1506     if(s->first_slice_line && n!=3){
1507         if(n!=2) c= 1024;
1508         if(n!=1 && s->mb_x == s->resync_mb_x) a= 1024;
1509     }
1510     pred_dc = 1024;
1511     /* just DC prediction */
1512     if (a != 1024 && c != 1024)
1513         pred_dc = (a + c) >> 1;
1514     else if (a != 1024)
1515         pred_dc = a;
1516     else
1517         pred_dc = c;
1518     
1519     /* we assume pred is positive */
1520     //pred_dc = (pred_dc + (scale >> 1)) / scale;
1521     *dc_val_ptr = &dc_val[x + y * wrap];
1522     return pred_dc;
1523 }
1524
1525 static void h263_pred_acdc(MpegEncContext * s, DCTELEM *block, int n)
1526 {
1527     int x, y, wrap, a, c, pred_dc, scale, i;
1528     int16_t *dc_val, *ac_val, *ac_val1;
1529
1530     /* find prediction */
1531     if (n < 4) {
1532         x = 2 * s->mb_x + (n & 1);
1533         y = 2 * s->mb_y + (n>> 1);
1534         wrap = s->b8_stride;
1535         dc_val = s->dc_val[0];
1536         ac_val = s->ac_val[0][0];
1537         scale = s->y_dc_scale;
1538     } else {
1539         x = s->mb_x;
1540         y = s->mb_y;
1541         wrap = s->mb_stride;
1542         dc_val = s->dc_val[n - 4 + 1];
1543         ac_val = s->ac_val[n - 4 + 1][0];
1544         scale = s->c_dc_scale;
1545     }
1546     
1547     ac_val += ((y) * wrap + (x)) * 16;
1548     ac_val1 = ac_val;
1549     
1550     /* B C
1551      * A X 
1552      */
1553     a = dc_val[(x - 1) + (y) * wrap];
1554     c = dc_val[(x) + (y - 1) * wrap];
1555     
1556     /* No prediction outside GOB boundary */
1557     if(s->first_slice_line && n!=3){
1558         if(n!=2) c= 1024;
1559         if(n!=1 && s->mb_x == s->resync_mb_x) a= 1024;
1560     }
1561     
1562     if (s->ac_pred) {
1563         pred_dc = 1024;
1564         if (s->h263_aic_dir) {
1565             /* left prediction */
1566             if (a != 1024) {
1567                 ac_val -= 16;
1568                 for(i=1;i<8;i++) {
1569                     block[s->dsp.idct_permutation[i<<3]] += ac_val[i];
1570                 }
1571                 pred_dc = a;
1572             }
1573         } else {
1574             /* top prediction */
1575             if (c != 1024) {
1576                 ac_val -= 16 * wrap;
1577                 for(i=1;i<8;i++) {
1578                     block[s->dsp.idct_permutation[i   ]] += ac_val[i + 8];
1579                 }
1580                 pred_dc = c;
1581             }
1582         }
1583     } else {
1584         /* just DC prediction */
1585         if (a != 1024 && c != 1024)
1586             pred_dc = (a + c) >> 1;
1587         else if (a != 1024)
1588             pred_dc = a;
1589         else
1590             pred_dc = c;
1591     }
1592     
1593     /* we assume pred is positive */
1594     block[0]=block[0]*scale + pred_dc;
1595     
1596     if (block[0] < 0)
1597         block[0] = 0;
1598     else 
1599         block[0] |= 1;
1600     
1601     /* Update AC/DC tables */
1602     dc_val[(x) + (y) * wrap] = block[0];
1603     
1604     /* left copy */
1605     for(i=1;i<8;i++)
1606         ac_val1[i    ] = block[s->dsp.idct_permutation[i<<3]];
1607     /* top copy */
1608     for(i=1;i<8;i++)
1609         ac_val1[8 + i] = block[s->dsp.idct_permutation[i   ]];
1610 }
1611
1612 int16_t *h263_pred_motion(MpegEncContext * s, int block, int dir,
1613                         int *px, int *py)
1614 {
1615     int wrap;
1616     int16_t *A, *B, *C, (*mot_val)[2];
1617     static const int off[4]= {2, 1, 1, -1};
1618
1619     wrap = s->b8_stride;
1620     mot_val = s->current_picture.motion_val[dir] + s->block_index[block];
1621
1622     A = mot_val[ - 1];
1623     /* special case for first (slice) line */
1624     if (s->first_slice_line && block<3) {
1625         // we can't just change some MVs to simulate that as we need them for the B frames (and ME)
1626         // and if we ever support non rectangular objects than we need to do a few ifs here anyway :(
1627         if(block==0){ //most common case
1628             if(s->mb_x  == s->resync_mb_x){ //rare
1629                 *px= *py = 0;
1630             }else if(s->mb_x + 1 == s->resync_mb_x && s->h263_pred){ //rare
1631                 C = mot_val[off[block] - wrap];
1632                 if(s->mb_x==0){
1633                     *px = C[0];
1634                     *py = C[1];
1635                 }else{
1636                     *px = mid_pred(A[0], 0, C[0]);
1637                     *py = mid_pred(A[1], 0, C[1]);
1638                 }
1639             }else{
1640                 *px = A[0];
1641                 *py = A[1];
1642             }
1643         }else if(block==1){
1644             if(s->mb_x + 1 == s->resync_mb_x && s->h263_pred){ //rare
1645                 C = mot_val[off[block] - wrap];
1646                 *px = mid_pred(A[0], 0, C[0]);
1647                 *py = mid_pred(A[1], 0, C[1]);
1648             }else{
1649                 *px = A[0];
1650                 *py = A[1];
1651             }
1652         }else{ /* block==2*/
1653             B = mot_val[ - wrap];
1654             C = mot_val[off[block] - wrap];
1655             if(s->mb_x == s->resync_mb_x) //rare
1656                 A[0]=A[1]=0;
1657     
1658             *px = mid_pred(A[0], B[0], C[0]);
1659             *py = mid_pred(A[1], B[1], C[1]);
1660         }
1661     } else {
1662         B = mot_val[ - wrap];
1663         C = mot_val[off[block] - wrap];
1664         *px = mid_pred(A[0], B[0], C[0]);
1665         *py = mid_pred(A[1], B[1], C[1]);
1666     }
1667     return *mot_val;
1668 }
1669
1670 #ifdef CONFIG_ENCODERS
1671 void ff_h263_encode_motion(MpegEncContext * s, int val, int f_code)
1672 {
1673     int range, l, bit_size, sign, code, bits;
1674
1675     if (val == 0) {
1676         /* zero vector */
1677         code = 0;
1678         put_bits(&s->pb, mvtab[code][1], mvtab[code][0]);
1679     } else {
1680         bit_size = f_code - 1;
1681         range = 1 << bit_size;
1682         /* modulo encoding */
1683         l= INT_BIT - 6 - bit_size;
1684         val = (val<<l)>>l;
1685         sign = val>>31;
1686         val= (val^sign)-sign;
1687         sign&=1;
1688
1689         val--;
1690         code = (val >> bit_size) + 1;
1691         bits = val & (range - 1);
1692
1693         put_bits(&s->pb, mvtab[code][1] + 1, (mvtab[code][0] << 1) | sign); 
1694         if (bit_size > 0) {
1695             put_bits(&s->pb, bit_size, bits);
1696         }
1697     }
1698 }
1699
1700 /* Encode MV differences on H.263+ with Unrestricted MV mode */
1701 static void h263p_encode_umotion(MpegEncContext * s, int val)
1702 {
1703     short sval = 0; 
1704     short i = 0;
1705     short n_bits = 0;
1706     short temp_val;
1707     int code = 0;
1708     int tcode;
1709     
1710     if ( val == 0)
1711         put_bits(&s->pb, 1, 1);
1712     else if (val == 1)
1713         put_bits(&s->pb, 3, 0);
1714     else if (val == -1)
1715         put_bits(&s->pb, 3, 2);
1716     else {
1717         
1718         sval = ((val < 0) ? (short)(-val):(short)val);
1719         temp_val = sval;
1720         
1721         while (temp_val != 0) {
1722             temp_val = temp_val >> 1;
1723             n_bits++;
1724         }
1725         
1726         i = n_bits - 1;
1727         while (i > 0) {
1728             tcode = (sval & (1 << (i-1))) >> (i-1);
1729             tcode = (tcode << 1) | 1;
1730             code = (code << 2) | tcode;
1731             i--;
1732         }
1733         code = ((code << 1) | (val < 0)) << 1;
1734         put_bits(&s->pb, (2*n_bits)+1, code);
1735         //printf("\nVal = %d\tCode = %d", sval, code);
1736     }
1737 }
1738
1739 static void init_mv_penalty_and_fcode(MpegEncContext *s)
1740 {
1741     int f_code;
1742     int mv;
1743     
1744     if(mv_penalty==NULL)
1745         mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) );
1746     
1747     for(f_code=1; f_code<=MAX_FCODE; f_code++){
1748         for(mv=-MAX_MV; mv<=MAX_MV; mv++){
1749             int len;
1750
1751             if(mv==0) len= mvtab[0][1];
1752             else{
1753                 int val, bit_size, range, code;
1754
1755                 bit_size = f_code - 1;
1756                 range = 1 << bit_size;
1757
1758                 val=mv;
1759                 if (val < 0) 
1760                     val = -val;
1761                 val--;
1762                 code = (val >> bit_size) + 1;
1763                 if(code<33){
1764                     len= mvtab[code][1] + 1 + bit_size;
1765                 }else{
1766                     len= mvtab[32][1] + 2 + bit_size;
1767                 }
1768             }
1769
1770             mv_penalty[f_code][mv+MAX_MV]= len;
1771         }
1772     }
1773
1774     for(f_code=MAX_FCODE; f_code>0; f_code--){
1775         for(mv=-(16<<f_code); mv<(16<<f_code); mv++){
1776             fcode_tab[mv+MAX_MV]= f_code;
1777         }
1778     }
1779
1780     for(mv=0; mv<MAX_MV*2+1; mv++){
1781         umv_fcode_tab[mv]= 1;
1782     }
1783 }
1784 #endif
1785
1786 #ifdef CONFIG_ENCODERS
1787
1788 static void init_uni_dc_tab(void)
1789 {
1790     int level, uni_code, uni_len;
1791
1792     for(level=-256; level<256; level++){
1793         int size, v, l;
1794         /* find number of bits */
1795         size = 0;
1796         v = abs(level);
1797         while (v) {
1798             v >>= 1;
1799             size++;
1800         }
1801
1802         if (level < 0)
1803             l= (-level) ^ ((1 << size) - 1);
1804         else
1805             l= level;
1806
1807         /* luminance */
1808         uni_code= DCtab_lum[size][0];
1809         uni_len = DCtab_lum[size][1];
1810
1811         if (size > 0) {
1812             uni_code<<=size; uni_code|=l;
1813             uni_len+=size;
1814             if (size > 8){
1815                 uni_code<<=1; uni_code|=1;
1816                 uni_len++;
1817             }
1818         }
1819         uni_DCtab_lum_bits[level+256]= uni_code;
1820         uni_DCtab_lum_len [level+256]= uni_len;
1821
1822         /* chrominance */
1823         uni_code= DCtab_chrom[size][0];
1824         uni_len = DCtab_chrom[size][1];
1825         
1826         if (size > 0) {
1827             uni_code<<=size; uni_code|=l;
1828             uni_len+=size;
1829             if (size > 8){
1830                 uni_code<<=1; uni_code|=1;
1831                 uni_len++;
1832             }
1833         }
1834         uni_DCtab_chrom_bits[level+256]= uni_code;
1835         uni_DCtab_chrom_len [level+256]= uni_len;
1836
1837     }
1838 }
1839
1840 #endif //CONFIG_ENCODERS
1841
1842 #ifdef CONFIG_ENCODERS
1843 static void init_uni_mpeg4_rl_tab(RLTable *rl, uint32_t *bits_tab, uint8_t *len_tab){
1844     int slevel, run, last;
1845     
1846     assert(MAX_LEVEL >= 64);
1847     assert(MAX_RUN   >= 63);
1848
1849     for(slevel=-64; slevel<64; slevel++){
1850         if(slevel==0) continue;
1851         for(run=0; run<64; run++){
1852             for(last=0; last<=1; last++){
1853                 const int index= UNI_MPEG4_ENC_INDEX(last, run, slevel+64);
1854                 int level= slevel < 0 ? -slevel : slevel;
1855                 int sign= slevel < 0 ? 1 : 0;
1856                 int bits, len, code;
1857                 int level1, run1;
1858                 
1859                 len_tab[index]= 100;
1860                      
1861                 /* ESC0 */
1862                 code= get_rl_index(rl, last, run, level);
1863                 bits= rl->table_vlc[code][0];
1864                 len=  rl->table_vlc[code][1];
1865                 bits=bits*2+sign; len++;
1866                 
1867                 if(code!=rl->n && len < len_tab[index]){
1868                     bits_tab[index]= bits;
1869                     len_tab [index]= len;
1870                 }
1871 #if 1
1872                 /* ESC1 */
1873                 bits= rl->table_vlc[rl->n][0];
1874                 len=  rl->table_vlc[rl->n][1];
1875                 bits=bits*2;    len++; //esc1
1876                 level1= level - rl->max_level[last][run];
1877                 if(level1>0){
1878                     code= get_rl_index(rl, last, run, level1);
1879                     bits<<= rl->table_vlc[code][1];
1880                     len  += rl->table_vlc[code][1];
1881                     bits += rl->table_vlc[code][0];
1882                     bits=bits*2+sign; len++;
1883                 
1884                     if(code!=rl->n && len < len_tab[index]){
1885                         bits_tab[index]= bits;
1886                         len_tab [index]= len;
1887                     }
1888                 }
1889 #endif 
1890 #if 1
1891                 /* ESC2 */
1892                 bits= rl->table_vlc[rl->n][0];
1893                 len=  rl->table_vlc[rl->n][1];
1894                 bits=bits*4+2;    len+=2; //esc2
1895                 run1 = run - rl->max_run[last][level] - 1;
1896                 if(run1>=0){
1897                     code= get_rl_index(rl, last, run1, level);
1898                     bits<<= rl->table_vlc[code][1];
1899                     len  += rl->table_vlc[code][1];
1900                     bits += rl->table_vlc[code][0];
1901                     bits=bits*2+sign; len++;
1902                 
1903                     if(code!=rl->n && len < len_tab[index]){
1904                         bits_tab[index]= bits;
1905                         len_tab [index]= len;
1906                     }
1907                 }
1908 #endif           
1909                 /* ESC3 */        
1910                 bits= rl->table_vlc[rl->n][0];
1911                 len = rl->table_vlc[rl->n][1];
1912                 bits=bits*4+3;    len+=2; //esc3
1913                 bits=bits*2+last; len++;
1914                 bits=bits*64+run; len+=6;
1915                 bits=bits*2+1;    len++;  //marker
1916                 bits=bits*4096+(slevel&0xfff); len+=12;
1917                 bits=bits*2+1;    len++;  //marker
1918                 
1919                 if(len < len_tab[index]){
1920                     bits_tab[index]= bits;
1921                     len_tab [index]= len;
1922                 }
1923             }
1924         }
1925     }
1926 }
1927
1928 static void init_uni_h263_rl_tab(RLTable *rl, uint32_t *bits_tab, uint8_t *len_tab){
1929     int slevel, run, last;
1930     
1931     assert(MAX_LEVEL >= 64);
1932     assert(MAX_RUN   >= 63);
1933
1934     for(slevel=-64; slevel<64; slevel++){
1935         if(slevel==0) continue;
1936         for(run=0; run<64; run++){
1937             for(last=0; last<=1; last++){
1938                 const int index= UNI_MPEG4_ENC_INDEX(last, run, slevel+64);
1939                 int level= slevel < 0 ? -slevel : slevel;
1940                 int sign= slevel < 0 ? 1 : 0;
1941                 int bits, len, code;
1942                 
1943                 len_tab[index]= 100;
1944                      
1945                 /* ESC0 */
1946                 code= get_rl_index(rl, last, run, level);
1947                 bits= rl->table_vlc[code][0];
1948                 len=  rl->table_vlc[code][1];
1949                 bits=bits*2+sign; len++;
1950                 
1951                 if(code!=rl->n && len < len_tab[index]){
1952                     if(bits_tab) bits_tab[index]= bits;
1953                     len_tab [index]= len;
1954                 }
1955                 /* ESC */
1956                 bits= rl->table_vlc[rl->n][0];
1957                 len = rl->table_vlc[rl->n][1];
1958                 bits=bits*2+last; len++;
1959                 bits=bits*64+run; len+=6;
1960                 bits=bits*256+(level&0xff); len+=8;
1961                 
1962                 if(len < len_tab[index]){
1963                     if(bits_tab) bits_tab[index]= bits;
1964                     len_tab [index]= len;
1965                 }
1966             }
1967         }
1968     }
1969 }
1970
1971 void h263_encode_init(MpegEncContext *s)
1972 {
1973     static int done = 0;
1974
1975     if (!done) {
1976         done = 1;
1977
1978         init_uni_dc_tab();
1979
1980         init_rl(&rl_inter, 1);
1981         init_rl(&rl_intra, 1);
1982         init_rl(&rl_intra_aic, 1);
1983         
1984         init_uni_mpeg4_rl_tab(&rl_intra, uni_mpeg4_intra_rl_bits, uni_mpeg4_intra_rl_len);
1985         init_uni_mpeg4_rl_tab(&rl_inter, uni_mpeg4_inter_rl_bits, uni_mpeg4_inter_rl_len);
1986
1987         init_uni_h263_rl_tab(&rl_intra_aic, NULL, uni_h263_intra_aic_rl_len);
1988         init_uni_h263_rl_tab(&rl_inter    , NULL, uni_h263_inter_rl_len);
1989
1990         init_mv_penalty_and_fcode(s);
1991     }
1992     s->me.mv_penalty= mv_penalty; //FIXME exact table for msmpeg4 & h263p
1993     
1994     s->intra_ac_vlc_length     =s->inter_ac_vlc_length     = uni_h263_inter_rl_len;
1995     s->intra_ac_vlc_last_length=s->inter_ac_vlc_last_length= uni_h263_inter_rl_len + 128*64;
1996     if(s->h263_aic){
1997         s->intra_ac_vlc_length     = uni_h263_intra_aic_rl_len;
1998         s->intra_ac_vlc_last_length= uni_h263_intra_aic_rl_len + 128*64;
1999     }
2000     s->ac_esc_length= 7+1+6+8;
2001
2002     // use fcodes >1 only for mpeg4 & h263 & h263p FIXME
2003     switch(s->codec_id){
2004     case CODEC_ID_MPEG4:
2005         s->fcode_tab= fcode_tab;
2006         s->min_qcoeff= -2048;
2007         s->max_qcoeff=  2047;
2008         s->intra_ac_vlc_length     = uni_mpeg4_intra_rl_len;
2009         s->intra_ac_vlc_last_length= uni_mpeg4_intra_rl_len + 128*64;
2010         s->inter_ac_vlc_length     = uni_mpeg4_inter_rl_len;
2011         s->inter_ac_vlc_last_length= uni_mpeg4_inter_rl_len + 128*64;
2012         s->luma_dc_vlc_length= uni_DCtab_lum_len;
2013         s->chroma_dc_vlc_length= uni_DCtab_chrom_len;
2014         s->ac_esc_length= 7+2+1+6+1+12+1;
2015         s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table;
2016         s->c_dc_scale_table= ff_mpeg4_c_dc_scale_table;
2017
2018         if(s->flags & CODEC_FLAG_GLOBAL_HEADER){
2019
2020             s->avctx->extradata= av_malloc(1024);
2021             init_put_bits(&s->pb, s->avctx->extradata, 1024);
2022             
2023             if(!(s->workaround_bugs & FF_BUG_MS))
2024                 mpeg4_encode_visual_object_header(s);
2025             mpeg4_encode_vol_header(s, 0, 0);
2026
2027 //            ff_mpeg4_stuffing(&s->pb); ?
2028             flush_put_bits(&s->pb);
2029             s->avctx->extradata_size= (put_bits_count(&s->pb)+7)>>3;
2030         }
2031         
2032         break;
2033     case CODEC_ID_H263P:
2034         if(s->umvplus)
2035             s->fcode_tab= umv_fcode_tab;
2036         if(s->modified_quant){
2037             s->min_qcoeff= -2047;
2038             s->max_qcoeff=  2047;
2039         }else{
2040             s->min_qcoeff= -127;
2041             s->max_qcoeff=  127;
2042         }
2043         break;
2044         //Note for mpeg4 & h263 the dc-scale table will be set per frame as needed later 
2045     case CODEC_ID_FLV1:
2046         if (s->h263_flv > 1) {
2047             s->min_qcoeff= -1023;
2048             s->max_qcoeff=  1023;
2049         } else {
2050             s->min_qcoeff= -127;
2051             s->max_qcoeff=  127;
2052         }
2053         s->y_dc_scale_table=
2054         s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
2055         break;
2056     default: //nothing needed - default table already set in mpegvideo.c
2057         s->min_qcoeff= -127;
2058         s->max_qcoeff=  127;
2059         s->y_dc_scale_table=
2060         s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
2061     }
2062 }
2063
2064 /**
2065  * encodes a 8x8 block.
2066  * @param block the 8x8 block
2067  * @param n block index (0-3 are luma, 4-5 are chroma)
2068  */
2069 static void h263_encode_block(MpegEncContext * s, DCTELEM * block, int n)
2070 {
2071     int level, run, last, i, j, last_index, last_non_zero, sign, slevel, code;
2072     RLTable *rl;
2073
2074     rl = &rl_inter;
2075     if (s->mb_intra && !s->h263_aic) {
2076         /* DC coef */
2077         level = block[0];
2078         /* 255 cannot be represented, so we clamp */
2079         if (level > 254) {
2080             level = 254;
2081             block[0] = 254;
2082         }
2083         /* 0 cannot be represented also */
2084         else if (level < 1) {
2085             level = 1;
2086             block[0] = 1;
2087         }
2088         if (level == 128) //FIXME check rv10
2089             put_bits(&s->pb, 8, 0xff);
2090         else
2091             put_bits(&s->pb, 8, level);
2092         i = 1;
2093     } else {
2094         i = 0;
2095         if (s->h263_aic && s->mb_intra)
2096             rl = &rl_intra_aic;
2097             
2098         if(s->alt_inter_vlc && !s->mb_intra){
2099             int aic_vlc_bits=0;
2100             int inter_vlc_bits=0;
2101             int wrong_pos=-1;
2102             int aic_code;
2103             
2104             last_index = s->block_last_index[n];
2105             last_non_zero = i - 1;
2106             for (; i <= last_index; i++) {
2107                 j = s->intra_scantable.permutated[i];
2108                 level = block[j];
2109                 if (level) {
2110                     run = i - last_non_zero - 1;
2111                     last = (i == last_index);
2112                     
2113                     if(level<0) level= -level;
2114                 
2115                     code = get_rl_index(rl, last, run, level);
2116                     aic_code = get_rl_index(&rl_intra_aic, last, run, level);
2117                     inter_vlc_bits += rl->table_vlc[code][1]+1;
2118                     aic_vlc_bits   += rl_intra_aic.table_vlc[aic_code][1]+1;
2119
2120                     if (code == rl->n) {
2121                         inter_vlc_bits += 1+6+8-1;
2122                     }                
2123                     if (aic_code == rl_intra_aic.n) {
2124                         aic_vlc_bits += 1+6+8-1;
2125                         wrong_pos += run + 1;
2126                     }else
2127                         wrong_pos += wrong_run[aic_code];
2128                     last_non_zero = i;
2129                 }    
2130             }
2131             i = 0;
2132             if(aic_vlc_bits < inter_vlc_bits && wrong_pos > 63)
2133                 rl = &rl_intra_aic;
2134         }
2135     }
2136    
2137     /* AC coefs */
2138     last_index = s->block_last_index[n];
2139     last_non_zero = i - 1;
2140     for (; i <= last_index; i++) {
2141         j = s->intra_scantable.permutated[i];
2142         level = block[j];
2143         if (level) {
2144             run = i - last_non_zero - 1;
2145             last = (i == last_index);
2146             sign = 0;
2147             slevel = level;
2148             if (level < 0) {
2149                 sign = 1;
2150                 level = -level;
2151             }
2152             code = get_rl_index(rl, last, run, level);
2153             put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
2154             if (code == rl->n) {
2155               if(s->h263_flv <= 1){
2156                 put_bits(&s->pb, 1, last);
2157                 put_bits(&s->pb, 6, run);
2158                 
2159                 assert(slevel != 0);
2160
2161                 if(level < 128) 
2162                     put_bits(&s->pb, 8, slevel & 0xff);
2163                 else{
2164                     put_bits(&s->pb, 8, 128);
2165                     put_bits(&s->pb, 5, slevel & 0x1f);
2166                     put_bits(&s->pb, 6, (slevel>>5)&0x3f);
2167                 }
2168               }else{
2169                 if(level < 64) { // 7-bit level
2170                         put_bits(&s->pb, 1, 0);
2171                         put_bits(&s->pb, 1, last);
2172                         put_bits(&s->pb, 6, run);
2173
2174                         put_bits(&s->pb, 7, slevel & 0x7f);
2175                     } else {
2176                         /* 11-bit level */
2177                         put_bits(&s->pb, 1, 1);
2178                         put_bits(&s->pb, 1, last);
2179                         put_bits(&s->pb, 6, run);
2180
2181                         put_bits(&s->pb, 11, slevel & 0x7ff);
2182                     }
2183               }
2184             } else {
2185                 put_bits(&s->pb, 1, sign);
2186             }
2187             last_non_zero = i;
2188         }
2189     }
2190 }
2191 #endif
2192
2193 #ifdef CONFIG_ENCODERS
2194
2195 /***************************************************/
2196 /**
2197  * add mpeg4 stuffing bits (01...1)
2198  */
2199 void ff_mpeg4_stuffing(PutBitContext * pbc)
2200 {
2201     int length;
2202     put_bits(pbc, 1, 0);
2203     length= (-put_bits_count(pbc))&7;
2204     if(length) put_bits(pbc, length, (1<<length)-1);
2205 }
2206
2207 /* must be called before writing the header */
2208 void ff_set_mpeg4_time(MpegEncContext * s, int picture_number){
2209     int time_div, time_mod;
2210
2211     assert(s->current_picture_ptr->pts != AV_NOPTS_VALUE);
2212     s->time= s->current_picture_ptr->pts*s->avctx->time_base.num;
2213
2214     time_div= s->time/s->avctx->time_base.den;
2215     time_mod= s->time%s->avctx->time_base.den;
2216
2217     if(s->pict_type==B_TYPE){
2218         s->pb_time= s->pp_time - (s->last_non_b_time - s->time);
2219         assert(s->pb_time > 0 && s->pb_time < s->pp_time);
2220     }else{
2221         s->last_time_base= s->time_base;
2222         s->time_base= time_div;
2223         s->pp_time= s->time - s->last_non_b_time;
2224         s->last_non_b_time= s->time;
2225         assert(picture_number==0 || s->pp_time > 0);
2226     }
2227 }
2228
2229 static void mpeg4_encode_gop_header(MpegEncContext * s){
2230     int hours, minutes, seconds;
2231     int64_t time;
2232     
2233     put_bits(&s->pb, 16, 0);
2234     put_bits(&s->pb, 16, GOP_STARTCODE);
2235     
2236     time= s->current_picture_ptr->pts;
2237     if(s->reordered_input_picture[1])
2238         time= FFMIN(time, s->reordered_input_picture[1]->pts);
2239     time= time*s->avctx->time_base.num;
2240
2241     seconds= time/s->avctx->time_base.den;
2242     minutes= seconds/60; seconds %= 60;
2243     hours= minutes/60; minutes %= 60;
2244     hours%=24;
2245
2246     put_bits(&s->pb, 5, hours);
2247     put_bits(&s->pb, 6, minutes);
2248     put_bits(&s->pb, 1, 1);
2249     put_bits(&s->pb, 6, seconds);
2250     
2251     put_bits(&s->pb, 1, !!(s->flags&CODEC_FLAG_CLOSED_GOP)); 
2252     put_bits(&s->pb, 1, 0); //broken link == NO
2253     
2254     s->last_time_base= time / s->avctx->time_base.den; 
2255
2256     ff_mpeg4_stuffing(&s->pb);
2257 }
2258
2259 static void mpeg4_encode_visual_object_header(MpegEncContext * s){
2260     int profile_and_level_indication;
2261     int vo_ver_id;
2262     
2263     if(s->avctx->profile != FF_PROFILE_UNKNOWN){
2264         profile_and_level_indication = s->avctx->profile << 4;
2265     }else if(s->max_b_frames || s->quarter_sample){
2266         profile_and_level_indication= 0xF0; // adv simple
2267     }else{
2268         profile_and_level_indication= 0x00; // simple
2269     }
2270
2271     if(s->avctx->level != FF_LEVEL_UNKNOWN){
2272         profile_and_level_indication |= s->avctx->level;
2273     }else{
2274         profile_and_level_indication |= 1; //level 1
2275     }
2276
2277     if(profile_and_level_indication>>4 == 0xF){
2278         vo_ver_id= 5;
2279     }else{
2280         vo_ver_id= 1;
2281     }
2282
2283     //FIXME levels
2284
2285     put_bits(&s->pb, 16, 0);
2286     put_bits(&s->pb, 16, VOS_STARTCODE);
2287
2288     put_bits(&s->pb, 8, profile_and_level_indication);
2289
2290     put_bits(&s->pb, 16, 0);
2291     put_bits(&s->pb, 16, VISUAL_OBJ_STARTCODE);
2292     
2293     put_bits(&s->pb, 1, 1);
2294         put_bits(&s->pb, 4, vo_ver_id);
2295         put_bits(&s->pb, 3, 1); //priority
2296  
2297     put_bits(&s->pb, 4, 1); //visual obj type== video obj
2298     
2299     put_bits(&s->pb, 1, 0); //video signal type == no clue //FIXME
2300
2301     ff_mpeg4_stuffing(&s->pb);
2302 }
2303
2304 static void mpeg4_encode_vol_header(MpegEncContext * s, int vo_number, int vol_number)
2305 {
2306     int vo_ver_id;
2307
2308     if(s->max_b_frames || s->quarter_sample){
2309         vo_ver_id= 5;
2310         s->vo_type= ADV_SIMPLE_VO_TYPE;
2311     }else{
2312         vo_ver_id= 1;
2313         s->vo_type= SIMPLE_VO_TYPE;
2314     }
2315
2316     put_bits(&s->pb, 16, 0);
2317     put_bits(&s->pb, 16, 0x100 + vo_number);        /* video obj */
2318     put_bits(&s->pb, 16, 0);
2319     put_bits(&s->pb, 16, 0x120 + vol_number);       /* video obj layer */
2320
2321     put_bits(&s->pb, 1, 0);             /* random access vol */
2322     put_bits(&s->pb, 8, s->vo_type);    /* video obj type indication */
2323     if(s->workaround_bugs & FF_BUG_MS) {
2324         put_bits(&s->pb, 1, 0);        /* is obj layer id= no */
2325     } else {
2326         put_bits(&s->pb, 1, 1);        /* is obj layer id= yes */
2327         put_bits(&s->pb, 4, vo_ver_id);    /* is obj layer ver id */
2328         put_bits(&s->pb, 3, 1);        /* is obj layer priority */
2329     }
2330     
2331     aspect_to_info(s, s->avctx->sample_aspect_ratio);
2332
2333     put_bits(&s->pb, 4, s->aspect_ratio_info);/* aspect ratio info */
2334     if (s->aspect_ratio_info == FF_ASPECT_EXTENDED){
2335         put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.num);
2336         put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.den);
2337     }
2338
2339     if(s->workaround_bugs & FF_BUG_MS) { //
2340         put_bits(&s->pb, 1, 0);        /* vol control parameters= no @@@ */
2341     } else {
2342         put_bits(&s->pb, 1, 1);        /* vol control parameters= yes */
2343         put_bits(&s->pb, 2, 1);        /* chroma format YUV 420/YV12 */
2344         put_bits(&s->pb, 1, s->low_delay);
2345         put_bits(&s->pb, 1, 0);        /* vbv parameters= no */
2346     }
2347
2348     put_bits(&s->pb, 2, RECT_SHAPE);    /* vol shape= rectangle */
2349     put_bits(&s->pb, 1, 1);             /* marker bit */
2350     
2351     put_bits(&s->pb, 16, s->avctx->time_base.den);
2352     if (s->time_increment_bits < 1)
2353         s->time_increment_bits = 1;
2354     put_bits(&s->pb, 1, 1);             /* marker bit */
2355     put_bits(&s->pb, 1, 0);             /* fixed vop rate=no */
2356     put_bits(&s->pb, 1, 1);             /* marker bit */
2357     put_bits(&s->pb, 13, s->width);     /* vol width */
2358     put_bits(&s->pb, 1, 1);             /* marker bit */
2359     put_bits(&s->pb, 13, s->height);    /* vol height */
2360     put_bits(&s->pb, 1, 1);             /* marker bit */
2361     put_bits(&s->pb, 1, s->progressive_sequence ? 0 : 1);
2362     put_bits(&s->pb, 1, 1);             /* obmc disable */
2363     if (vo_ver_id == 1) {
2364         put_bits(&s->pb, 1, s->vol_sprite_usage);               /* sprite enable */
2365     }else{
2366         put_bits(&s->pb, 2, s->vol_sprite_usage);               /* sprite enable */
2367     }
2368     
2369     put_bits(&s->pb, 1, 0);             /* not 8 bit == false */
2370     put_bits(&s->pb, 1, s->mpeg_quant); /* quant type= (0=h263 style)*/
2371
2372     if(s->mpeg_quant){
2373         ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
2374         ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
2375     }
2376
2377     if (vo_ver_id != 1)
2378         put_bits(&s->pb, 1, s->quarter_sample);
2379     put_bits(&s->pb, 1, 1);             /* complexity estimation disable */
2380     s->resync_marker= s->rtp_mode;
2381     put_bits(&s->pb, 1, s->resync_marker ? 0 : 1);/* resync marker disable */
2382     put_bits(&s->pb, 1, s->data_partitioning ? 1 : 0);
2383     if(s->data_partitioning){
2384         put_bits(&s->pb, 1, 0);         /* no rvlc */
2385     }
2386
2387     if (vo_ver_id != 1){
2388         put_bits(&s->pb, 1, 0);         /* newpred */
2389         put_bits(&s->pb, 1, 0);         /* reduced res vop */
2390     }
2391     put_bits(&s->pb, 1, 0);             /* scalability */
2392     
2393     ff_mpeg4_stuffing(&s->pb);
2394
2395     /* user data */
2396     if(!(s->flags & CODEC_FLAG_BITEXACT)){
2397         put_bits(&s->pb, 16, 0);
2398         put_bits(&s->pb, 16, 0x1B2);    /* user_data */
2399         put_string(&s->pb, LIBAVCODEC_IDENT, 0);
2400     }
2401 }
2402
2403 /* write mpeg4 VOP header */
2404 void mpeg4_encode_picture_header(MpegEncContext * s, int picture_number)
2405 {
2406     int time_incr;
2407     int time_div, time_mod;
2408     
2409     if(s->pict_type==I_TYPE){
2410         if(!(s->flags&CODEC_FLAG_GLOBAL_HEADER)){
2411             if(s->strict_std_compliance < FF_COMPLIANCE_VERY_STRICT) //HACK, the reference sw is buggy
2412                 mpeg4_encode_visual_object_header(s);
2413             if(s->strict_std_compliance < FF_COMPLIANCE_VERY_STRICT || picture_number==0) //HACK, the reference sw is buggy
2414                 mpeg4_encode_vol_header(s, 0, 0);
2415         }
2416         if(!(s->workaround_bugs & FF_BUG_MS))
2417             mpeg4_encode_gop_header(s);
2418     }
2419     
2420     s->partitioned_frame= s->data_partitioning && s->pict_type!=B_TYPE;
2421
2422 //printf("num:%d rate:%d base:%d\n", s->picture_number, s->time_base.den, FRAME_RATE_BASE);
2423     
2424     put_bits(&s->pb, 16, 0);            /* vop header */
2425     put_bits(&s->pb, 16, VOP_STARTCODE);        /* vop header */
2426     put_bits(&s->pb, 2, s->pict_type - 1);      /* pict type: I = 0 , P = 1 */
2427
2428     assert(s->time>=0);
2429     time_div= s->time/s->avctx->time_base.den;
2430     time_mod= s->time%s->avctx->time_base.den;
2431     time_incr= time_div - s->last_time_base;
2432     assert(time_incr >= 0);
2433     while(time_incr--)
2434         put_bits(&s->pb, 1, 1);
2435         
2436     put_bits(&s->pb, 1, 0);
2437
2438     put_bits(&s->pb, 1, 1);     /* marker */
2439     put_bits(&s->pb, s->time_increment_bits, time_mod); /* time increment */
2440     put_bits(&s->pb, 1, 1);     /* marker */
2441     put_bits(&s->pb, 1, 1);     /* vop coded */
2442     if (    s->pict_type == P_TYPE 
2443         || (s->pict_type == S_TYPE && s->vol_sprite_usage==GMC_SPRITE)) {
2444         put_bits(&s->pb, 1, s->no_rounding);    /* rounding type */
2445     }
2446     put_bits(&s->pb, 3, 0);     /* intra dc VLC threshold */
2447     if(!s->progressive_sequence){
2448          put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first);
2449          put_bits(&s->pb, 1, s->alternate_scan);
2450     }
2451     //FIXME sprite stuff
2452
2453     put_bits(&s->pb, 5, s->qscale);
2454
2455     if (s->pict_type != I_TYPE)
2456         put_bits(&s->pb, 3, s->f_code); /* fcode_for */
2457     if (s->pict_type == B_TYPE)
2458         put_bits(&s->pb, 3, s->b_code); /* fcode_back */
2459     //    printf("****frame %d\n", picture_number);
2460 }
2461
2462 #endif //CONFIG_ENCODERS
2463
2464 /**
2465  * set qscale and update qscale dependant variables.
2466  */
2467 void ff_set_qscale(MpegEncContext * s, int qscale)
2468 {
2469     if (qscale < 1)
2470         qscale = 1;
2471     else if (qscale > 31)
2472         qscale = 31;
2473         
2474     s->qscale = qscale;
2475     s->chroma_qscale= s->chroma_qscale_table[qscale];
2476
2477     s->y_dc_scale= s->y_dc_scale_table[ qscale ];
2478     s->c_dc_scale= s->c_dc_scale_table[ s->chroma_qscale ];
2479 }
2480
2481 /**
2482  * predicts the dc.
2483  * encoding quantized level -> quantized diff
2484  * decoding quantized diff -> quantized level  
2485  * @param n block index (0-3 are luma, 4-5 are chroma)
2486  * @param dir_ptr pointer to an integer where the prediction direction will be stored
2487  */
2488 static inline int ff_mpeg4_pred_dc(MpegEncContext * s, int n, int level, int *dir_ptr, int encoding)
2489 {
2490     int a, b, c, wrap, pred, scale, ret;
2491     uint16_t *dc_val;
2492
2493     /* find prediction */
2494     if (n < 4) {
2495         scale = s->y_dc_scale;
2496     } else {
2497         scale = s->c_dc_scale;
2498     }
2499     if(IS_3IV1)
2500         scale= 8;
2501
2502     wrap= s->block_wrap[n];
2503     dc_val = s->dc_val[0] + s->block_index[n];
2504
2505     /* B C
2506      * A X 
2507      */
2508     a = dc_val[ - 1];
2509     b = dc_val[ - 1 - wrap];
2510     c = dc_val[ - wrap];
2511
2512     /* outside slice handling (we can't do that by memset as we need the dc for error resilience) */
2513     if(s->first_slice_line && n!=3){
2514         if(n!=2) b=c= 1024;
2515         if(n!=1 && s->mb_x == s->resync_mb_x) b=a= 1024;
2516     }
2517     if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1){
2518         if(n==0 || n==4 || n==5)
2519             b=1024;
2520     }
2521
2522     if (abs(a - b) < abs(b - c)) {
2523         pred = c;
2524         *dir_ptr = 1; /* top */
2525     } else {
2526         pred = a;
2527         *dir_ptr = 0; /* left */
2528     }
2529     /* we assume pred is positive */
2530     pred = FASTDIV((pred + (scale >> 1)), scale);
2531
2532     if(encoding){
2533         ret = level - pred;
2534     }else{
2535         level += pred;
2536         ret= level;
2537         if(s->error_resilience>=3){
2538             if(level<0){
2539                 av_log(s->avctx, AV_LOG_ERROR, "dc<0 at %dx%d\n", s->mb_x, s->mb_y);
2540                 return -1;
2541             }
2542             if(level*scale > 2048 + scale){
2543                 av_log(s->avctx, AV_LOG_ERROR, "dc overflow at %dx%d\n", s->mb_x, s->mb_y);
2544                 return -1;
2545             }
2546         }
2547     }
2548     level *=scale;
2549     if(level&(~2047)){
2550         if(level<0) 
2551             level=0;
2552         else if(!(s->workaround_bugs&FF_BUG_DC_CLIP))
2553             level=2047;
2554     }
2555     dc_val[0]= level;
2556
2557     return ret;
2558 }
2559
2560 /**
2561  * predicts the ac.
2562  * @param n block index (0-3 are luma, 4-5 are chroma)
2563  * @param dir the ac prediction direction
2564  */
2565 void mpeg4_pred_ac(MpegEncContext * s, DCTELEM *block, int n,
2566                    int dir)
2567 {
2568     int i;
2569     int16_t *ac_val, *ac_val1;
2570     int8_t * const qscale_table= s->current_picture.qscale_table;
2571
2572     /* find prediction */
2573     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
2574     ac_val1 = ac_val;
2575     if (s->ac_pred) {
2576         if (dir == 0) {
2577             const int xy= s->mb_x-1 + s->mb_y*s->mb_stride;
2578             /* left prediction */
2579             ac_val -= 16;
2580             
2581             if(s->mb_x==0 || s->qscale == qscale_table[xy] || n==1 || n==3){
2582                 /* same qscale */
2583                 for(i=1;i<8;i++) {
2584                     block[s->dsp.idct_permutation[i<<3]] += ac_val[i];
2585                 }
2586             }else{
2587                 /* different qscale, we must rescale */
2588                 for(i=1;i<8;i++) {
2589                     block[s->dsp.idct_permutation[i<<3]] += ROUNDED_DIV(ac_val[i]*qscale_table[xy], s->qscale);
2590                 }
2591             }
2592         } else {
2593             const int xy= s->mb_x + s->mb_y*s->mb_stride - s->mb_stride;
2594             /* top prediction */
2595             ac_val -= 16 * s->block_wrap[n];
2596
2597             if(s->mb_y==0 || s->qscale == qscale_table[xy] || n==2 || n==3){
2598                 /* same qscale */
2599                 for(i=1;i<8;i++) {
2600                     block[s->dsp.idct_permutation[i]] += ac_val[i + 8];
2601                 }
2602             }else{
2603                 /* different qscale, we must rescale */
2604                 for(i=1;i<8;i++) {
2605                     block[s->dsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8]*qscale_table[xy], s->qscale);
2606                 }
2607             }
2608         }
2609     }
2610     /* left copy */
2611     for(i=1;i<8;i++)
2612         ac_val1[i    ] = block[s->dsp.idct_permutation[i<<3]];
2613
2614     /* top copy */
2615     for(i=1;i<8;i++)
2616         ac_val1[8 + i] = block[s->dsp.idct_permutation[i   ]];
2617
2618 }
2619
2620 #ifdef CONFIG_ENCODERS
2621
2622 /**
2623  * encodes the dc value.
2624  * @param n block index (0-3 are luma, 4-5 are chroma)
2625  */
2626 static inline void mpeg4_encode_dc(PutBitContext * s, int level, int n)
2627 {
2628 #if 1
2629 //    if(level<-255 || level>255) printf("dc overflow\n");
2630     level+=256;
2631     if (n < 4) {
2632         /* luminance */
2633         put_bits(s, uni_DCtab_lum_len[level], uni_DCtab_lum_bits[level]);
2634     } else {
2635         /* chrominance */
2636         put_bits(s, uni_DCtab_chrom_len[level], uni_DCtab_chrom_bits[level]);
2637     }
2638 #else
2639     int size, v;
2640     /* find number of bits */
2641     size = 0;
2642     v = abs(level);
2643     while (v) {
2644         v >>= 1;
2645         size++;
2646     }
2647
2648     if (n < 4) {
2649         /* luminance */
2650         put_bits(&s->pb, DCtab_lum[size][1], DCtab_lum[size][0]);
2651     } else {
2652         /* chrominance */
2653         put_bits(&s->pb, DCtab_chrom[size][1], DCtab_chrom[size][0]);
2654     }
2655
2656     /* encode remaining bits */
2657     if (size > 0) {
2658         if (level < 0)
2659             level = (-level) ^ ((1 << size) - 1);
2660         put_bits(&s->pb, size, level);
2661         if (size > 8)
2662             put_bits(&s->pb, 1, 1);
2663     }
2664 #endif
2665 }
2666
2667 static inline int mpeg4_get_dc_length(int level, int n){
2668     if (n < 4) {
2669         return uni_DCtab_lum_len[level + 256];
2670     } else {
2671         return uni_DCtab_chrom_len[level + 256];
2672     }
2673 }
2674
2675 /**
2676  * encodes a 8x8 block
2677  * @param n block index (0-3 are luma, 4-5 are chroma)
2678  */
2679 static inline void mpeg4_encode_block(MpegEncContext * s, DCTELEM * block, int n, int intra_dc, 
2680                                uint8_t *scan_table, PutBitContext *dc_pb, PutBitContext *ac_pb)
2681 {
2682     int i, last_non_zero;
2683 #if 0 //variables for the outcommented version
2684     int code, sign, last;
2685 #endif
2686     const RLTable *rl;
2687     uint32_t *bits_tab;
2688     uint8_t *len_tab;
2689     const int last_index = s->block_last_index[n];
2690
2691     if (s->mb_intra) { //Note gcc (3.2.1 at least) will optimize this away
2692         /* mpeg4 based DC predictor */
2693         mpeg4_encode_dc(dc_pb, intra_dc, n);
2694         if(last_index<1) return;
2695         i = 1;
2696         rl = &rl_intra;
2697         bits_tab= uni_mpeg4_intra_rl_bits;
2698         len_tab = uni_mpeg4_intra_rl_len;
2699     } else {
2700         if(last_index<0) return;
2701         i = 0;
2702         rl = &rl_inter;
2703         bits_tab= uni_mpeg4_inter_rl_bits;
2704         len_tab = uni_mpeg4_inter_rl_len;
2705     }
2706
2707     /* AC coefs */
2708     last_non_zero = i - 1;
2709 #if 1
2710     for (; i < last_index; i++) {
2711         int level = block[ scan_table[i] ];
2712         if (level) {
2713             int run = i - last_non_zero - 1;
2714             level+=64;
2715             if((level&(~127)) == 0){
2716                 const int index= UNI_MPEG4_ENC_INDEX(0, run, level);
2717                 put_bits(ac_pb, len_tab[index], bits_tab[index]);
2718             }else{ //ESC3
2719                 put_bits(ac_pb, 7+2+1+6+1+12+1, (3<<23)+(3<<21)+(0<<20)+(run<<14)+(1<<13)+(((level-64)&0xfff)<<1)+1);
2720             }
2721             last_non_zero = i;
2722         }
2723     }
2724     /*if(i<=last_index)*/{
2725         int level = block[ scan_table[i] ];
2726         int run = i - last_non_zero - 1;
2727         level+=64;
2728         if((level&(~127)) == 0){
2729             const int index= UNI_MPEG4_ENC_INDEX(1, run, level);
2730             put_bits(ac_pb, len_tab[index], bits_tab[index]);
2731         }else{ //ESC3
2732             put_bits(ac_pb, 7+2+1+6+1+12+1, (3<<23)+(3<<21)+(1<<20)+(run<<14)+(1<<13)+(((level-64)&0xfff)<<1)+1);
2733         }
2734     }
2735 #else
2736     for (; i <= last_index; i++) {
2737         const int slevel = block[ scan_table[i] ];
2738         if (slevel) {
2739             int level;
2740             int run = i - last_non_zero - 1;
2741             last = (i == last_index);
2742             sign = 0;
2743             level = slevel;
2744             if (level < 0) {
2745                 sign = 1;
2746                 level = -level;
2747             }
2748             code = get_rl_index(rl, last, run, level);
2749             put_bits(ac_pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
2750             if (code == rl->n) {
2751                 int level1, run1;
2752                 level1 = level - rl->max_level[last][run];
2753                 if (level1 < 1) 
2754                     goto esc2;
2755                 code = get_rl_index(rl, last, run, level1);
2756                 if (code == rl->n) {
2757                 esc2:
2758                     put_bits(ac_pb, 1, 1);
2759                     if (level > MAX_LEVEL)
2760                         goto esc3;
2761                     run1 = run - rl->max_run[last][level] - 1;
2762                     if (run1 < 0)
2763                         goto esc3;
2764                     code = get_rl_index(rl, last, run1, level);
2765                     if (code == rl->n) {
2766                     esc3:
2767                         /* third escape */
2768                         put_bits(ac_pb, 1, 1);
2769                         put_bits(ac_pb, 1, last);
2770                         put_bits(ac_pb, 6, run);
2771                         put_bits(ac_pb, 1, 1);
2772                         put_bits(ac_pb, 12, slevel & 0xfff);
2773                         put_bits(ac_pb, 1, 1);
2774                     } else {
2775                         /* second escape */
2776                         put_bits(ac_pb, 1, 0);
2777                         put_bits(ac_pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
2778                         put_bits(ac_pb, 1, sign);
2779                     }
2780                 } else {
2781                     /* first escape */
2782                     put_bits(ac_pb, 1, 0);
2783                     put_bits(ac_pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
2784                     put_bits(ac_pb, 1, sign);
2785                 }
2786             } else {
2787                 put_bits(ac_pb, 1, sign);
2788             }
2789             last_non_zero = i;
2790         }
2791     }
2792 #endif
2793 }
2794
2795 static int mpeg4_get_block_length(MpegEncContext * s, DCTELEM * block, int n, int intra_dc, 
2796                                uint8_t *scan_table)
2797 {
2798     int i, last_non_zero;
2799     const RLTable *rl;
2800     uint8_t *len_tab;
2801     const int last_index = s->block_last_index[n];
2802     int len=0;
2803
2804     if (s->mb_intra) { //Note gcc (3.2.1 at least) will optimize this away
2805         /* mpeg4 based DC predictor */
2806         len += mpeg4_get_dc_length(intra_dc, n);
2807         if(last_index<1) return len;
2808         i = 1;
2809         rl = &rl_intra;
2810         len_tab = uni_mpeg4_intra_rl_len;
2811     } else {
2812         if(last_index<0) return 0;
2813         i = 0;
2814         rl = &rl_inter;
2815         len_tab = uni_mpeg4_inter_rl_len;
2816     }
2817
2818     /* AC coefs */
2819     last_non_zero = i - 1;
2820     for (; i < last_index; i++) {
2821         int level = block[ scan_table[i] ];
2822         if (level) {
2823             int run = i - last_non_zero - 1;
2824             level+=64;
2825             if((level&(~127)) == 0){
2826                 const int index= UNI_MPEG4_ENC_INDEX(0, run, level);
2827                 len += len_tab[index];
2828             }else{ //ESC3
2829                 len += 7+2+1+6+1+12+1;
2830             }
2831             last_non_zero = i;
2832         }
2833     }
2834     /*if(i<=last_index)*/{
2835         int level = block[ scan_table[i] ];
2836         int run = i - last_non_zero - 1;
2837         level+=64;
2838         if((level&(~127)) == 0){
2839             const int index= UNI_MPEG4_ENC_INDEX(1, run, level);
2840             len += len_tab[index];
2841         }else{ //ESC3
2842             len += 7+2+1+6+1+12+1;
2843         }
2844     }
2845     
2846     return len;
2847 }
2848
2849 #endif
2850
2851
2852 /***********************************************/
2853 /* decoding */
2854
2855 static VLC intra_MCBPC_vlc;
2856 static VLC inter_MCBPC_vlc;
2857 static VLC cbpy_vlc;
2858 static VLC mv_vlc;
2859 static VLC dc_lum, dc_chrom;
2860 static VLC sprite_trajectory;
2861 static VLC mb_type_b_vlc;
2862 static VLC h263_mbtype_b_vlc;
2863 static VLC cbpc_b_vlc;
2864
2865 void init_vlc_rl(RLTable *rl, int use_static)
2866 {
2867     int i, q;
2868  
2869     /* Return if static table is already initialized */
2870     if(use_static && rl->rl_vlc[0])
2871         return;    
2872
2873     init_vlc(&rl->vlc, 9, rl->n + 1, 
2874              &rl->table_vlc[0][1], 4, 2,
2875              &rl->table_vlc[0][0], 4, 2, use_static);
2876
2877     
2878     for(q=0; q<32; q++){
2879         int qmul= q*2;
2880         int qadd= (q-1)|1;
2881         
2882         if(q==0){
2883             qmul=1;
2884             qadd=0;
2885         }
2886         if(use_static)        
2887             rl->rl_vlc[q]= av_mallocz_static(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
2888         else
2889             rl->rl_vlc[q]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
2890         for(i=0; i<rl->vlc.table_size; i++){
2891             int code= rl->vlc.table[i][0];
2892             int len = rl->vlc.table[i][1];
2893             int level, run;
2894         
2895             if(len==0){ // illegal code
2896                 run= 66;
2897                 level= MAX_LEVEL;
2898             }else if(len<0){ //more bits needed
2899                 run= 0;
2900                 level= code;
2901             }else{
2902                 if(code==rl->n){ //esc
2903                     run= 66;
2904                     level= 0;
2905                 }else{
2906                     run=   rl->table_run  [code] + 1;
2907                     level= rl->table_level[code] * qmul + qadd;
2908                     if(code >= rl->last) run+=192;
2909                 }
2910             }
2911             rl->rl_vlc[q][i].len= len;
2912             rl->rl_vlc[q][i].level= level;
2913             rl->rl_vlc[q][i].run= run;
2914         }
2915     }
2916 }
2917
2918 /* init vlcs */
2919
2920 /* XXX: find a better solution to handle static init */
2921 void h263_decode_init_vlc(MpegEncContext *s)
2922 {
2923     static int done = 0;
2924
2925     if (!done) {
2926         done = 1;
2927
2928         init_vlc(&intra_MCBPC_vlc, INTRA_MCBPC_VLC_BITS, 9, 
2929                  intra_MCBPC_bits, 1, 1,
2930                  intra_MCBPC_code, 1, 1, 1);
2931         init_vlc(&inter_MCBPC_vlc, INTER_MCBPC_VLC_BITS, 28, 
2932                  inter_MCBPC_bits, 1, 1,
2933                  inter_MCBPC_code, 1, 1, 1);
2934         init_vlc(&cbpy_vlc, CBPY_VLC_BITS, 16,
2935                  &cbpy_tab[0][1], 2, 1,
2936                  &cbpy_tab[0][0], 2, 1, 1);
2937         init_vlc(&mv_vlc, MV_VLC_BITS, 33,
2938                  &mvtab[0][1], 2, 1,
2939                  &mvtab[0][0], 2, 1, 1);
2940         init_rl(&rl_inter, 1);
2941         init_rl(&rl_intra, 1);
2942         init_rl(&rvlc_rl_inter, 1);
2943         init_rl(&rvlc_rl_intra, 1);
2944         init_rl(&rl_intra_aic, 1);
2945         init_vlc_rl(&rl_inter, 1);
2946         init_vlc_rl(&rl_intra, 1);
2947         init_vlc_rl(&rvlc_rl_inter, 1);
2948         init_vlc_rl(&rvlc_rl_intra, 1);
2949         init_vlc_rl(&rl_intra_aic, 1);
2950         init_vlc(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2951                  &DCtab_lum[0][1], 2, 1,
2952                  &DCtab_lum[0][0], 2, 1, 1);
2953         init_vlc(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2954                  &DCtab_chrom[0][1], 2, 1,
2955                  &DCtab_chrom[0][0], 2, 1, 1);
2956         init_vlc(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2957                  &sprite_trajectory_tab[0][1], 4, 2,
2958                  &sprite_trajectory_tab[0][0], 4, 2, 1);
2959         init_vlc(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2960                  &mb_type_b_tab[0][1], 2, 1,
2961                  &mb_type_b_tab[0][0], 2, 1, 1);
2962         init_vlc(&h263_mbtype_b_vlc, H263_MBTYPE_B_VLC_BITS, 15,
2963                  &h263_mbtype_b_tab[0][1], 2, 1,
2964                  &h263_mbtype_b_tab[0][0], 2, 1, 1);
2965         init_vlc(&cbpc_b_vlc, CBPC_B_VLC_BITS, 4,
2966                  &cbpc_b_tab[0][1], 2, 1,
2967                  &cbpc_b_tab[0][0], 2, 1, 1);
2968     }
2969 }
2970
2971 /**
2972  * Get the GOB height based on picture height.
2973  */
2974 int ff_h263_get_gob_height(MpegEncContext *s){
2975     if (s->height <= 400)
2976         return 1;
2977     else if (s->height <= 800)
2978         return  2;
2979     else
2980         return 4;
2981 }
2982
2983 int ff_h263_decode_mba(MpegEncContext *s)
2984 {
2985     int i, mb_pos;
2986
2987     for(i=0; i<6; i++){
2988         if(s->mb_num-1 <= ff_mba_max[i]) break;
2989     }
2990     mb_pos= get_bits(&s->gb, ff_mba_length[i]);
2991     s->mb_x= mb_pos % s->mb_width;
2992     s->mb_y= mb_pos / s->mb_width;
2993
2994     return mb_pos;
2995 }
2996
2997 void ff_h263_encode_mba(MpegEncContext *s)
2998 {
2999     int i, mb_pos;
3000
3001     for(i=0; i<6; i++){
3002         if(s->mb_num-1 <= ff_mba_max[i]) break;
3003     }
3004     mb_pos= s->mb_x + s->mb_width*s->mb_y;
3005     put_bits(&s->pb, ff_mba_length[i], mb_pos);
3006 }
3007
3008 /**
3009  * decodes the group of blocks header or slice header.
3010  * @return <0 if an error occured
3011  */
3012 static int h263_decode_gob_header(MpegEncContext *s)
3013 {
3014     unsigned int val, gfid, gob_number;
3015     int left;
3016     
3017     /* Check for GOB Start Code */
3018     val = show_bits(&s->gb, 16);
3019     if(val)
3020         return -1;
3021
3022         /* We have a GBSC probably with GSTUFF */
3023     skip_bits(&s->gb, 16); /* Drop the zeros */
3024     left= s->gb.size_in_bits - get_bits_count(&s->gb);
3025     //MN: we must check the bits left or we might end in a infinite loop (or segfault)
3026     for(;left>13; left--){
3027         if(get_bits1(&s->gb)) break; /* Seek the '1' bit */
3028     }
3029     if(left<=13) 
3030         return -1;
3031
3032     if(s->h263_slice_structured){
3033         if(get_bits1(&s->gb)==0)
3034             return -1;
3035
3036         ff_h263_decode_mba(s);
3037
3038         if(s->mb_num > 1583)
3039             if(get_bits1(&s->gb)==0)
3040                 return -1;
3041         
3042         s->qscale = get_bits(&s->gb, 5); /* SQUANT */
3043         if(get_bits1(&s->gb)==0)
3044             return -1;
3045         gfid = get_bits(&s->gb, 2); /* GFID */
3046     }else{
3047         gob_number = get_bits(&s->gb, 5); /* GN */
3048         s->mb_x= 0;
3049         s->mb_y= s->gob_index* gob_number;
3050         gfid = get_bits(&s->gb, 2); /* GFID */
3051         s->qscale = get_bits(&s->gb, 5); /* GQUANT */
3052     }
3053         
3054     if(s->mb_y >= s->mb_height) 
3055         return -1;
3056
3057     if(s->qscale==0) 
3058         return -1;
3059
3060     return 0;
3061 }
3062
3063 static inline void memsetw(short *tab, int val, int n)
3064 {
3065     int i;
3066     for(i=0;i<n;i++)
3067         tab[i] = val;
3068 }
3069
3070 #ifdef CONFIG_ENCODERS
3071
3072 void ff_mpeg4_init_partitions(MpegEncContext *s)
3073 {
3074     uint8_t *start= pbBufPtr(&s->pb);
3075     uint8_t *end= s->pb.buf_end;
3076     int size= end - start;
3077     int pb_size = (((long)start + size/3)&(~3)) - (long)start;
3078     int tex_size= (size - 2*pb_size)&(~3);
3079     
3080     set_put_bits_buffer_size(&s->pb, pb_size);
3081     init_put_bits(&s->tex_pb, start + pb_size           , tex_size);
3082     init_put_bits(&s->pb2   , start + pb_size + tex_size, pb_size);
3083 }
3084
3085 void ff_mpeg4_merge_partitions(MpegEncContext *s)
3086 {
3087     const int pb2_len   = put_bits_count(&s->pb2   );
3088     const int tex_pb_len= put_bits_count(&s->tex_pb);
3089     const int bits= put_bits_count(&s->pb);
3090
3091     if(s->pict_type==I_TYPE){
3092         put_bits(&s->pb, 19, DC_MARKER);
3093         s->misc_bits+=19 + pb2_len + bits - s->last_bits;
3094         s->i_tex_bits+= tex_pb_len;
3095     }else{
3096         put_bits(&s->pb, 17, MOTION_MARKER);
3097         s->misc_bits+=17 + pb2_len;
3098         s->mv_bits+= bits - s->last_bits;
3099         s->p_tex_bits+= tex_pb_len;
3100     }
3101
3102     flush_put_bits(&s->pb2);
3103     flush_put_bits(&s->tex_pb);
3104
3105     set_put_bits_buffer_size(&s->pb, s->pb2.buf_end - s->pb.buf);
3106     ff_copy_bits(&s->pb, s->pb2.buf   , pb2_len);
3107     ff_copy_bits(&s->pb, s->tex_pb.buf, tex_pb_len);
3108     s->last_bits= put_bits_count(&s->pb);
3109 }
3110
3111 #endif //CONFIG_ENCODERS
3112
3113 int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s){
3114     switch(s->pict_type){
3115         case I_TYPE:
3116             return 16;
3117         case P_TYPE:
3118         case S_TYPE:
3119             return s->f_code+15;
3120         case B_TYPE:
3121             return FFMAX(FFMAX(s->f_code, s->b_code)+15, 17);
3122         default:
3123             return -1;
3124     }
3125 }
3126
3127 #ifdef CONFIG_ENCODERS
3128
3129 void ff_mpeg4_encode_video_packet_header(MpegEncContext *s)
3130 {
3131     int mb_num_bits= av_log2(s->mb_num - 1) + 1;
3132
3133     put_bits(&s->pb, ff_mpeg4_get_video_packet_prefix_length(s), 0);
3134     put_bits(&s->pb, 1, 1);
3135     
3136     put_bits(&s->pb, mb_num_bits, s->mb_x + s->mb_y*s->mb_width);
3137     put_bits(&s->pb, s->quant_precision, s->qscale);
3138     put_bits(&s->pb, 1, 0); /* no HEC */
3139 }
3140
3141 #endif //CONFIG_ENCODERS
3142
3143 /**
3144  * check if the next stuff is a resync marker or the end.
3145  * @return 0 if not
3146  */
3147 static inline int mpeg4_is_resync(MpegEncContext *s){
3148     const int bits_count= get_bits_count(&s->gb);
3149     
3150     if(s->workaround_bugs&FF_BUG_NO_PADDING){
3151         return 0;
3152     }
3153
3154     if(bits_count + 8 >= s->gb.size_in_bits){
3155         int v= show_bits(&s->gb, 8);
3156         v|= 0x7F >> (7-(bits_count&7));
3157                 
3158         if(v==0x7F)
3159             return 1;
3160     }else{
3161         if(show_bits(&s->gb, 16) == ff_mpeg4_resync_prefix[bits_count&7]){
3162             int len;
3163             GetBitContext gb= s->gb;
3164         
3165             skip_bits(&s->gb, 1);
3166             align_get_bits(&s->gb);
3167         
3168             for(len=0; len<32; len++){
3169                 if(get_bits1(&s->gb)) break;
3170             }
3171
3172             s->gb= gb;
3173
3174             if(len>=ff_mpeg4_get_video_packet_prefix_length(s))
3175                 return 1;
3176         }
3177     }
3178     return 0;
3179 }
3180
3181 /**
3182  * decodes the next video packet.
3183  * @return <0 if something went wrong
3184  */
3185 static int mpeg4_decode_video_packet_header(MpegEncContext *s)
3186 {
3187     int mb_num_bits= av_log2(s->mb_num - 1) + 1;
3188     int header_extension=0, mb_num, len;
3189     
3190     /* is there enough space left for a video packet + header */
3191     if( get_bits_count(&s->gb) > s->gb.size_in_bits-20) return -1;
3192
3193     for(len=0; len<32; len++){
3194         if(get_bits1(&s->gb)) break;
3195     }
3196
3197     if(len!=ff_mpeg4_get_video_packet_prefix_length(s)){
3198         av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
3199         return -1;
3200     }
3201     
3202     if(s->shape != RECT_SHAPE){
3203         header_extension= get_bits1(&s->gb);
3204         //FIXME more stuff here
3205     }
3206
3207     mb_num= get_bits(&s->gb, mb_num_bits);
3208     if(mb_num>=s->mb_num){
3209         av_log(s->avctx, AV_LOG_ERROR, "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
3210         return -1;
3211     }
3212     if(s->pict_type == B_TYPE){
3213         while(s->next_picture.mbskip_table[ s->mb_index2xy[ mb_num ] ]) mb_num++;
3214         if(mb_num >= s->mb_num) return -1; // slice contains just skipped MBs which where allready decoded
3215     }
3216     
3217     s->mb_x= mb_num % s->mb_width;
3218     s->mb_y= mb_num / s->mb_width;
3219
3220     if(s->shape != BIN_ONLY_SHAPE){
3221         int qscale= get_bits(&s->gb, s->quant_precision); 
3222         if(qscale)
3223             s->chroma_qscale=s->qscale= qscale;
3224     }
3225
3226     if(s->shape == RECT_SHAPE){
3227         header_extension= get_bits1(&s->gb);
3228     }
3229     if(header_extension){
3230         int time_increment;
3231         int time_incr=0;
3232
3233         while (get_bits1(&s->gb) != 0) 
3234             time_incr++;
3235
3236         check_marker(&s->gb, "before time_increment in video packed header");
3237         time_increment= get_bits(&s->gb, s->time_increment_bits);
3238         check_marker(&s->gb, "before vop_coding_type in video packed header");
3239         
3240         skip_bits(&s->gb, 2); /* vop coding type */
3241         //FIXME not rect stuff here
3242
3243         if(s->shape != BIN_ONLY_SHAPE){
3244             skip_bits(&s->gb, 3); /* intra dc vlc threshold */
3245 //FIXME don't just ignore everything
3246             if(s->pict_type == S_TYPE && s->vol_sprite_usage==GMC_SPRITE){
3247                 mpeg4_decode_sprite_trajectory(s, &s->gb);
3248                 av_log(s->avctx, AV_LOG_ERROR, "untested\n");
3249             }
3250
3251             //FIXME reduced res stuff here
3252             
3253             if (s->pict_type != I_TYPE) {
3254                 int f_code = get_bits(&s->gb, 3);       /* fcode_for */
3255                 if(f_code==0){
3256                     av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (f_code=0)\n");
3257                 }
3258             }
3259             if (s->pict_type == B_TYPE) {
3260                 int b_code = get_bits(&s->gb, 3);
3261                 if(b_code==0){
3262                     av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (b_code=0)\n");
3263                 }
3264             }       
3265         }
3266     }
3267     //FIXME new-pred stuff
3268     
3269 //printf("parse ok %d %d %d %d\n", mb_num, s->mb_x + s->mb_y*s->mb_width, get_bits_count(gb), get_bits_count(&s->gb));
3270
3271     return 0;
3272 }
3273
3274 void ff_mpeg4_clean_buffers(MpegEncContext *s)
3275 {
3276     int c_wrap, c_xy, l_wrap, l_xy;
3277
3278     l_wrap= s->b8_stride;
3279     l_xy= (2*s->mb_y-1)*l_wrap + s->mb_x*2 - 1;
3280     c_wrap= s->mb_stride;
3281     c_xy= (s->mb_y-1)*c_wrap + s->mb_x - 1;
3282
3283 #if 0
3284     /* clean DC */
3285     memsetw(s->dc_val[0] + l_xy, 1024, l_wrap*2+1);
3286     memsetw(s->dc_val[1] + c_xy, 1024, c_wrap+1);
3287     memsetw(s->dc_val[2] + c_xy, 1024, c_wrap+1);
3288 #endif
3289
3290     /* clean AC */
3291     memset(s->ac_val[0] + l_xy, 0, (l_wrap*2+1)*16*sizeof(int16_t));
3292     memset(s->ac_val[1] + c_xy, 0, (c_wrap  +1)*16*sizeof(int16_t));
3293     memset(s->ac_val[2] + c_xy, 0, (c_wrap  +1)*16*sizeof(int16_t));
3294
3295     /* clean MV */
3296     // we can't clear the MVs as they might be needed by a b frame
3297 //    memset(s->motion_val + l_xy, 0, (l_wrap*2+1)*2*sizeof(int16_t));
3298 //    memset(s->motion_val, 0, 2*sizeof(int16_t)*(2 + s->mb_width*2)*(2 + s->mb_height*2));
3299     s->last_mv[0][0][0]=
3300     s->last_mv[0][0][1]=
3301     s->last_mv[1][0][0]=
3302     s->last_mv[1][0][1]= 0;
3303 }
3304
3305 /**
3306  * decodes the group of blocks / video packet header.
3307  * @return <0 if no resync found
3308  */
3309 int ff_h263_resync(MpegEncContext *s){
3310     int left, ret;
3311     
3312     if(s->codec_id==CODEC_ID_MPEG4){
3313         skip_bits1(&s->gb);
3314         align_get_bits(&s->gb);
3315     }
3316
3317     if(show_bits(&s->gb, 16)==0){
3318         if(s->codec_id==CODEC_ID_MPEG4)
3319             ret= mpeg4_decode_video_packet_header(s);
3320         else
3321             ret= h263_decode_gob_header(s);
3322         if(ret>=0)
3323             return 0;
3324     }
3325     //ok, it's not where its supposed to be ...
3326     s->gb= s->last_resync_gb;
3327     align_get_bits(&s->gb);
3328     left= s->gb.size_in_bits - get_bits_count(&s->gb);
3329     
3330     for(;left>16+1+5+5; left-=8){ 
3331         if(show_bits(&s->gb, 16)==0){
3332             GetBitContext bak= s->gb;
3333
3334             if(s->codec_id==CODEC_ID_MPEG4)
3335                 ret= mpeg4_decode_video_packet_header(s);
3336             else
3337                 ret= h263_decode_gob_header(s);
3338             if(ret>=0)
3339                 return 0;
3340
3341             s->gb= bak;
3342         }
3343         skip_bits(&s->gb, 8);
3344     }
3345     
3346     return -1;
3347 }
3348
3349 /**
3350  * gets the average motion vector for a GMC MB.
3351  * @param n either 0 for the x component or 1 for y
3352  * @returns the average MV for a GMC MB
3353  */
3354 static inline int get_amv(MpegEncContext *s, int n){
3355     int x, y, mb_v, sum, dx, dy, shift;
3356     int len = 1 << (s->f_code + 4);
3357     const int a= s->sprite_warping_accuracy;
3358     
3359     if(s->workaround_bugs & FF_BUG_AMV)
3360         len >>= s->quarter_sample;
3361
3362     if(s->real_sprite_warping_points==1){
3363         if(s->divx_version==500 && s->divx_build==413)
3364             sum= s->sprite_offset[0][n] / (1<<(a - s->quarter_sample));
3365         else
3366             sum= RSHIFT(s->sprite_offset[0][n]<<s->quarter_sample, a);
3367     }else{
3368         dx= s->sprite_delta[n][0];
3369         dy= s->sprite_delta[n][1];
3370         shift= s->sprite_shift[0];
3371         if(n) dy -= 1<<(shift + a + 1);
3372         else  dx -= 1<<(shift + a + 1);
3373         mb_v= s->sprite_offset[0][n] + dx*s->mb_x*16 + dy*s->mb_y*16;
3374
3375         sum=0;
3376         for(y=0; y<16; y++){
3377             int v;
3378         
3379             v= mb_v + dy*y;
3380             //XXX FIXME optimize
3381             for(x=0; x<16; x++){
3382                 sum+= v>>shift;
3383                 v+= dx;
3384             }
3385         }
3386         sum= RSHIFT(sum, a+8-s->quarter_sample);
3387     }
3388
3389     if      (sum < -len) sum= -len;
3390     else if (sum >= len) sum= len-1;
3391
3392     return sum;
3393 }
3394
3395 /**
3396  * decodes first partition.
3397  * @return number of MBs decoded or <0 if an error occured
3398  */
3399 static int mpeg4_decode_partition_a(MpegEncContext *s){
3400     int mb_num;
3401     static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
3402     
3403     /* decode first partition */
3404     mb_num=0;
3405     s->first_slice_line=1;
3406     for(; s->mb_y<s->mb_height; s->mb_y++){
3407         ff_init_block_index(s);
3408         for(; s->mb_x<s->mb_width; s->mb_x++){
3409             const int xy= s->mb_x + s->mb_y*s->mb_stride;
3410             int cbpc;
3411             int dir=0;
3412             
3413             mb_num++;
3414             ff_update_block_index(s);
3415             if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
3416                 s->first_slice_line=0;
3417             
3418             if(s->pict_type==I_TYPE){
3419                 int i;
3420
3421                 do{
3422                     if(show_bits_long(&s->gb, 19)==DC_MARKER){
3423                         return mb_num-1;
3424                     }
3425
3426                     cbpc = get_vlc2(&s->gb, intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
3427                     if (cbpc < 0){
3428                         av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
3429                         return -1;
3430                     }
3431                 }while(cbpc == 8);
3432                 
3433                 s->cbp_table[xy]= cbpc & 3;
3434                 s->current_picture.mb_type[xy]= MB_TYPE_INTRA;
3435                 s->mb_intra = 1;
3436
3437                 if(cbpc & 4) {
3438                     ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
3439                 }
3440                 s->current_picture.qscale_table[xy]= s->qscale;
3441
3442                 s->mbintra_table[xy]= 1;
3443                 for(i=0; i<6; i++){
3444                     int dc_pred_dir;
3445                     int dc= mpeg4_decode_dc(s, i, &dc_pred_dir); 
3446                     if(dc < 0){
3447                         av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
3448                         return -1;
3449                     }
3450                     dir<<=1;
3451                     if(dc_pred_dir) dir|=1;
3452                 }
3453                 s->pred_dir_table[xy]= dir;
3454             }else{ /* P/S_TYPE */
3455                 int mx, my, pred_x, pred_y, bits;
3456                 int16_t * const mot_val= s->current_picture.motion_val[0][s->block_index[0]];
3457                 const int stride= s->b8_stride*2;
3458
3459 try_again:
3460                 bits= show_bits(&s->gb, 17);
3461                 if(bits==MOTION_MARKER){
3462                     return mb_num-1;
3463                 }
3464                 skip_bits1(&s->gb);
3465                 if(bits&0x10000){
3466                     /* skip mb */
3467                     if(s->pict_type==S_TYPE && s->vol_sprite_usage==GMC_SPRITE){
3468                         s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0;
3469                         mx= get_amv(s, 0);
3470                         my= get_amv(s, 1);
3471                     }else{
3472                         s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
3473                         mx=my=0;
3474                     }
3475                     mot_val[0       ]= mot_val[2       ]=
3476                     mot_val[0+stride]= mot_val[2+stride]= mx;
3477                     mot_val[1       ]= mot_val[3       ]=
3478                     mot_val[1+stride]= mot_val[3+stride]= my;
3479
3480                     if(s->mbintra_table[xy])
3481                         ff_clean_intra_table_entries(s);
3482                     continue;
3483                 }
3484
3485                 cbpc = get_vlc2(&s->gb, inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
3486                 if (cbpc < 0){
3487                     av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
3488                     return -1;
3489                 }
3490                 if(cbpc == 20)
3491                     goto try_again;
3492
3493                 s->cbp_table[xy]= cbpc&(8+3); //8 is dquant
3494     
3495                 s->mb_intra = ((cbpc & 4) != 0);
3496         
3497                 if(s->mb_intra){
3498                     s->current_picture.mb_type[xy]= MB_TYPE_INTRA;
3499                     s->mbintra_table[xy]= 1;
3500                     mot_val[0       ]= mot_val[2       ]= 
3501                     mot_val[0+stride]= mot_val[2+stride]= 0;
3502                     mot_val[1       ]= mot_val[3       ]=
3503                     mot_val[1+stride]= mot_val[3+stride]= 0;
3504                 }else{
3505                     if(s->mbintra_table[xy])
3506                         ff_clean_intra_table_entries(s);
3507
3508                     if(s->pict_type==S_TYPE && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
3509                         s->mcsel= get_bits1(&s->gb);
3510                     else s->mcsel= 0;
3511         
3512                     if ((cbpc & 16) == 0) {
3513                         /* 16x16 motion prediction */
3514
3515                         h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
3516                         if(!s->mcsel){
3517                             mx = h263_decode_motion(s, pred_x, s->f_code);
3518                             if (mx >= 0xffff)
3519                                 return -1;
3520
3521                             my = h263_decode_motion(s, pred_y, s->f_code);
3522                             if (my >= 0xffff)
3523                                 return -1;
3524                             s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_L0;
3525                         } else {
3526                             mx = get_amv(s, 0);
3527                             my = get_amv(s, 1);
3528                             s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0;
3529                         }
3530
3531                         mot_val[0       ]= mot_val[2       ] =
3532                         mot_val[0+stride]= mot_val[2+stride]= mx;
3533                         mot_val[1       ]= mot_val[3       ]=
3534                         mot_val[1+stride]= mot_val[3+stride]= my;
3535                     } else {
3536                         int i;
3537                         s->current_picture.mb_type[xy]= MB_TYPE_8x8 | MB_TYPE_L0;
3538                         for(i=0;i<4;i++) {
3539                             int16_t *mot_val= h263_pred_motion(s, i, 0, &pred_x, &pred_y);
3540                             mx = h263_decode_motion(s, pred_x, s->f_code);
3541                             if (mx >= 0xffff)
3542                                 return -1;
3543                 
3544                             my = h263_decode_motion(s, pred_y, s->f_code);
3545                             if (my >= 0xffff)
3546                                 return -1;
3547                             mot_val[0] = mx;
3548                             mot_val[1] = my;
3549                         }
3550                     }
3551                 }
3552             }
3553         }
3554         s->mb_x= 0;
3555     }