h264_ps: Drop commented-out cruft
[ffmpeg.git] / libavcodec / h264_ps.c
1 /*
2  * H.26L/H.264/AVC/JVT/14496-10/... parameter set decoding
3  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
4  *
5  * This file is part of Libav.
6  *
7  * Libav is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * Libav is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21
22 /**
23  * @file
24  * H.264 / AVC / MPEG4 part10 parameter set decoding.
25  * @author Michael Niedermayer <michaelni@gmx.at>
26  */
27
28 #include "libavutil/imgutils.h"
29 #include "internal.h"
30 #include "avcodec.h"
31 #include "h264.h"
32 #include "h264data.h" //FIXME FIXME FIXME (just for zigzag_scan)
33 #include "golomb.h"
34
35 #define MAX_LOG2_MAX_FRAME_NUM    (12 + 4)
36 #define MIN_LOG2_MAX_FRAME_NUM    4
37
38 static const AVRational pixel_aspect[17]={
39  {0, 1},
40  {1, 1},
41  {12, 11},
42  {10, 11},
43  {16, 11},
44  {40, 33},
45  {24, 11},
46  {20, 11},
47  {32, 11},
48  {80, 33},
49  {18, 11},
50  {15, 11},
51  {64, 33},
52  {160,99},
53  {4, 3},
54  {3, 2},
55  {2, 1},
56 };
57
58 #define QP(qP,depth) ( (qP)+6*((depth)-8) )
59
60 #define CHROMA_QP_TABLE_END(d) \
61      QP(0,d),  QP(1,d),  QP(2,d),  QP(3,d),  QP(4,d),  QP(5,d),\
62      QP(6,d),  QP(7,d),  QP(8,d),  QP(9,d), QP(10,d), QP(11,d),\
63     QP(12,d), QP(13,d), QP(14,d), QP(15,d), QP(16,d), QP(17,d),\
64     QP(18,d), QP(19,d), QP(20,d), QP(21,d), QP(22,d), QP(23,d),\
65     QP(24,d), QP(25,d), QP(26,d), QP(27,d), QP(28,d), QP(29,d),\
66     QP(29,d), QP(30,d), QP(31,d), QP(32,d), QP(32,d), QP(33,d),\
67     QP(34,d), QP(34,d), QP(35,d), QP(35,d), QP(36,d), QP(36,d),\
68     QP(37,d), QP(37,d), QP(37,d), QP(38,d), QP(38,d), QP(38,d),\
69     QP(39,d), QP(39,d), QP(39,d), QP(39,d)
70
71 const uint8_t ff_h264_chroma_qp[3][QP_MAX_NUM+1] = {
72     {
73         CHROMA_QP_TABLE_END(8)
74     },
75     {
76         0, 1, 2, 3, 4, 5,
77         CHROMA_QP_TABLE_END(9)
78     },
79     {
80         0, 1, 2, 3,  4,  5,
81         6, 7, 8, 9, 10, 11,
82         CHROMA_QP_TABLE_END(10)
83     },
84 };
85
86 static const uint8_t default_scaling4[2][16]={
87 {   6,13,20,28,
88    13,20,28,32,
89    20,28,32,37,
90    28,32,37,42
91 },{
92    10,14,20,24,
93    14,20,24,27,
94    20,24,27,30,
95    24,27,30,34
96 }};
97
98 static const uint8_t default_scaling8[2][64]={
99 {   6,10,13,16,18,23,25,27,
100    10,11,16,18,23,25,27,29,
101    13,16,18,23,25,27,29,31,
102    16,18,23,25,27,29,31,33,
103    18,23,25,27,29,31,33,36,
104    23,25,27,29,31,33,36,38,
105    25,27,29,31,33,36,38,40,
106    27,29,31,33,36,38,40,42
107 },{
108     9,13,15,17,19,21,22,24,
109    13,13,17,19,21,22,24,25,
110    15,17,19,21,22,24,25,27,
111    17,19,21,22,24,25,27,28,
112    19,21,22,24,25,27,28,30,
113    21,22,24,25,27,28,30,32,
114    22,24,25,27,28,30,32,33,
115    24,25,27,28,30,32,33,35
116 }};
117
118 static inline int decode_hrd_parameters(H264Context *h, SPS *sps){
119     int cpb_count, i;
120     cpb_count = get_ue_golomb_31(&h->gb) + 1;
121
122     if(cpb_count > 32U){
123         av_log(h->avctx, AV_LOG_ERROR, "cpb_count %d invalid\n", cpb_count);
124         return -1;
125     }
126
127     get_bits(&h->gb, 4); /* bit_rate_scale */
128     get_bits(&h->gb, 4); /* cpb_size_scale */
129     for(i=0; i<cpb_count; i++){
130         get_ue_golomb_long(&h->gb); /* bit_rate_value_minus1 */
131         get_ue_golomb_long(&h->gb); /* cpb_size_value_minus1 */
132         get_bits1(&h->gb);     /* cbr_flag */
133     }
134     sps->initial_cpb_removal_delay_length = get_bits(&h->gb, 5) + 1;
135     sps->cpb_removal_delay_length = get_bits(&h->gb, 5) + 1;
136     sps->dpb_output_delay_length = get_bits(&h->gb, 5) + 1;
137     sps->time_offset_length = get_bits(&h->gb, 5);
138     sps->cpb_cnt = cpb_count;
139     return 0;
140 }
141
142 static inline int decode_vui_parameters(H264Context *h, SPS *sps){
143     int aspect_ratio_info_present_flag;
144     unsigned int aspect_ratio_idc;
145
146     aspect_ratio_info_present_flag= get_bits1(&h->gb);
147
148     if( aspect_ratio_info_present_flag ) {
149         aspect_ratio_idc= get_bits(&h->gb, 8);
150         if( aspect_ratio_idc == EXTENDED_SAR ) {
151             sps->sar.num= get_bits(&h->gb, 16);
152             sps->sar.den= get_bits(&h->gb, 16);
153         }else if(aspect_ratio_idc < FF_ARRAY_ELEMS(pixel_aspect)){
154             sps->sar=  pixel_aspect[aspect_ratio_idc];
155         }else{
156             av_log(h->avctx, AV_LOG_ERROR, "illegal aspect ratio\n");
157             return -1;
158         }
159     }else{
160         sps->sar.num=
161         sps->sar.den= 0;
162     }
163
164     if(get_bits1(&h->gb)){      /* overscan_info_present_flag */
165         get_bits1(&h->gb);      /* overscan_appropriate_flag */
166     }
167
168     sps->video_signal_type_present_flag = get_bits1(&h->gb);
169     if(sps->video_signal_type_present_flag){
170         get_bits(&h->gb, 3);    /* video_format */
171         sps->full_range = get_bits1(&h->gb); /* video_full_range_flag */
172
173         sps->colour_description_present_flag = get_bits1(&h->gb);
174         if(sps->colour_description_present_flag){
175             sps->color_primaries = get_bits(&h->gb, 8); /* colour_primaries */
176             sps->color_trc       = get_bits(&h->gb, 8); /* transfer_characteristics */
177             sps->colorspace      = get_bits(&h->gb, 8); /* matrix_coefficients */
178             if (sps->color_primaries >= AVCOL_PRI_NB)
179                 sps->color_primaries  = AVCOL_PRI_UNSPECIFIED;
180             if (sps->color_trc >= AVCOL_TRC_NB)
181                 sps->color_trc  = AVCOL_TRC_UNSPECIFIED;
182             if (sps->colorspace >= AVCOL_SPC_NB)
183                 sps->colorspace  = AVCOL_SPC_UNSPECIFIED;
184         }
185     }
186
187     if(get_bits1(&h->gb)){      /* chroma_location_info_present_flag */
188         h->avctx->chroma_sample_location = get_ue_golomb(&h->gb)+1;  /* chroma_sample_location_type_top_field */
189         get_ue_golomb(&h->gb);  /* chroma_sample_location_type_bottom_field */
190     }
191
192     sps->timing_info_present_flag = get_bits1(&h->gb);
193     if(sps->timing_info_present_flag){
194         sps->num_units_in_tick = get_bits_long(&h->gb, 32);
195         sps->time_scale = get_bits_long(&h->gb, 32);
196         if(!sps->num_units_in_tick || !sps->time_scale){
197             av_log(h->avctx, AV_LOG_ERROR, "time_scale/num_units_in_tick invalid or unsupported (%d/%d)\n", sps->time_scale, sps->num_units_in_tick);
198             return -1;
199         }
200         sps->fixed_frame_rate_flag = get_bits1(&h->gb);
201     }
202
203     sps->nal_hrd_parameters_present_flag = get_bits1(&h->gb);
204     if(sps->nal_hrd_parameters_present_flag)
205         if(decode_hrd_parameters(h, sps) < 0)
206             return -1;
207     sps->vcl_hrd_parameters_present_flag = get_bits1(&h->gb);
208     if(sps->vcl_hrd_parameters_present_flag)
209         if(decode_hrd_parameters(h, sps) < 0)
210             return -1;
211     if(sps->nal_hrd_parameters_present_flag || sps->vcl_hrd_parameters_present_flag)
212         get_bits1(&h->gb);     /* low_delay_hrd_flag */
213     sps->pic_struct_present_flag = get_bits1(&h->gb);
214
215     sps->bitstream_restriction_flag = get_bits1(&h->gb);
216     if(sps->bitstream_restriction_flag){
217         get_bits1(&h->gb);     /* motion_vectors_over_pic_boundaries_flag */
218         get_ue_golomb(&h->gb); /* max_bytes_per_pic_denom */
219         get_ue_golomb(&h->gb); /* max_bits_per_mb_denom */
220         get_ue_golomb(&h->gb); /* log2_max_mv_length_horizontal */
221         get_ue_golomb(&h->gb); /* log2_max_mv_length_vertical */
222         sps->num_reorder_frames= get_ue_golomb(&h->gb);
223         get_ue_golomb(&h->gb); /*max_dec_frame_buffering*/
224
225         if (get_bits_left(&h->gb) < 0) {
226             sps->num_reorder_frames=0;
227             sps->bitstream_restriction_flag= 0;
228         }
229
230         if(sps->num_reorder_frames > 16U /*max_dec_frame_buffering || max_dec_frame_buffering > 16*/){
231             av_log(h->avctx, AV_LOG_ERROR, "illegal num_reorder_frames %d\n", sps->num_reorder_frames);
232             return -1;
233         }
234     }
235     if (get_bits_left(&h->gb) < 0) {
236         av_log(h->avctx, AV_LOG_ERROR, "Overread VUI by %d bits\n", -get_bits_left(&h->gb));
237         return AVERROR_INVALIDDATA;
238     }
239
240     return 0;
241 }
242
243 static void decode_scaling_list(H264Context *h, uint8_t *factors, int size,
244                                 const uint8_t *jvt_list, const uint8_t *fallback_list){
245     int i, last = 8, next = 8;
246     const uint8_t *scan = size == 16 ? zigzag_scan : ff_zigzag_direct;
247     if(!get_bits1(&h->gb)) /* matrix not written, we use the predicted one */
248         memcpy(factors, fallback_list, size*sizeof(uint8_t));
249     else
250     for(i=0;i<size;i++){
251         if(next)
252             next = (last + get_se_golomb(&h->gb)) & 0xff;
253         if(!i && !next){ /* matrix not written, we use the preset one */
254             memcpy(factors, jvt_list, size*sizeof(uint8_t));
255             break;
256         }
257         last = factors[scan[i]] = next ? next : last;
258     }
259 }
260
261 static void decode_scaling_matrices(H264Context *h, SPS *sps, PPS *pps, int is_sps,
262                                    uint8_t (*scaling_matrix4)[16], uint8_t (*scaling_matrix8)[64]){
263     int fallback_sps = !is_sps && sps->scaling_matrix_present;
264     const uint8_t *fallback[4] = {
265         fallback_sps ? sps->scaling_matrix4[0] : default_scaling4[0],
266         fallback_sps ? sps->scaling_matrix4[3] : default_scaling4[1],
267         fallback_sps ? sps->scaling_matrix8[0] : default_scaling8[0],
268         fallback_sps ? sps->scaling_matrix8[3] : default_scaling8[1]
269     };
270     if(get_bits1(&h->gb)){
271         sps->scaling_matrix_present |= is_sps;
272         decode_scaling_list(h,scaling_matrix4[0],16,default_scaling4[0],fallback[0]); // Intra, Y
273         decode_scaling_list(h,scaling_matrix4[1],16,default_scaling4[0],scaling_matrix4[0]); // Intra, Cr
274         decode_scaling_list(h,scaling_matrix4[2],16,default_scaling4[0],scaling_matrix4[1]); // Intra, Cb
275         decode_scaling_list(h,scaling_matrix4[3],16,default_scaling4[1],fallback[1]); // Inter, Y
276         decode_scaling_list(h,scaling_matrix4[4],16,default_scaling4[1],scaling_matrix4[3]); // Inter, Cr
277         decode_scaling_list(h,scaling_matrix4[5],16,default_scaling4[1],scaling_matrix4[4]); // Inter, Cb
278         if(is_sps || pps->transform_8x8_mode){
279             decode_scaling_list(h,scaling_matrix8[0],64,default_scaling8[0],fallback[2]);  // Intra, Y
280             if(sps->chroma_format_idc == 3){
281                 decode_scaling_list(h,scaling_matrix8[1],64,default_scaling8[0],scaling_matrix8[0]);  // Intra, Cr
282                 decode_scaling_list(h,scaling_matrix8[2],64,default_scaling8[0],scaling_matrix8[1]);  // Intra, Cb
283             }
284             decode_scaling_list(h,scaling_matrix8[3],64,default_scaling8[1],fallback[3]);  // Inter, Y
285             if(sps->chroma_format_idc == 3){
286                 decode_scaling_list(h,scaling_matrix8[4],64,default_scaling8[1],scaling_matrix8[3]);  // Inter, Cr
287                 decode_scaling_list(h,scaling_matrix8[5],64,default_scaling8[1],scaling_matrix8[4]);  // Inter, Cb
288             }
289         }
290     }
291 }
292
293 int ff_h264_decode_seq_parameter_set(H264Context *h){
294     int profile_idc, level_idc, constraint_set_flags = 0;
295     unsigned int sps_id;
296     int i, log2_max_frame_num_minus4;
297     SPS *sps;
298
299     profile_idc= get_bits(&h->gb, 8);
300     constraint_set_flags |= get_bits1(&h->gb) << 0;   //constraint_set0_flag
301     constraint_set_flags |= get_bits1(&h->gb) << 1;   //constraint_set1_flag
302     constraint_set_flags |= get_bits1(&h->gb) << 2;   //constraint_set2_flag
303     constraint_set_flags |= get_bits1(&h->gb) << 3;   //constraint_set3_flag
304     get_bits(&h->gb, 4); // reserved
305     level_idc= get_bits(&h->gb, 8);
306     sps_id= get_ue_golomb_31(&h->gb);
307
308     if(sps_id >= MAX_SPS_COUNT) {
309         av_log(h->avctx, AV_LOG_ERROR, "sps_id (%d) out of range\n", sps_id);
310         return -1;
311     }
312     sps= av_mallocz(sizeof(SPS));
313     if(sps == NULL)
314         return -1;
315
316     sps->time_offset_length = 24;
317     sps->profile_idc= profile_idc;
318     sps->constraint_set_flags = constraint_set_flags;
319     sps->level_idc= level_idc;
320
321     memset(sps->scaling_matrix4, 16, sizeof(sps->scaling_matrix4));
322     memset(sps->scaling_matrix8, 16, sizeof(sps->scaling_matrix8));
323     sps->scaling_matrix_present = 0;
324
325     if (sps->profile_idc == 100 || sps->profile_idc == 110 ||
326         sps->profile_idc == 122 || sps->profile_idc == 244 ||
327         sps->profile_idc ==  44 || sps->profile_idc ==  83 ||
328         sps->profile_idc ==  86 || sps->profile_idc == 118 ||
329         sps->profile_idc == 128 || sps->profile_idc == 144) {
330         sps->chroma_format_idc= get_ue_golomb_31(&h->gb);
331         if(sps->chroma_format_idc > 3) {
332             av_log(h->avctx, AV_LOG_ERROR, "chroma_format_idc (%u) out of range\n", sps->chroma_format_idc);
333             goto fail;
334         } else if(sps->chroma_format_idc == 3) {
335             sps->residual_color_transform_flag = get_bits1(&h->gb);
336         }
337         sps->bit_depth_luma   = get_ue_golomb(&h->gb) + 8;
338         sps->bit_depth_chroma = get_ue_golomb(&h->gb) + 8;
339         sps->transform_bypass = get_bits1(&h->gb);
340         decode_scaling_matrices(h, sps, NULL, 1, sps->scaling_matrix4, sps->scaling_matrix8);
341     }else{
342         sps->chroma_format_idc= 1;
343         sps->bit_depth_luma   = 8;
344         sps->bit_depth_chroma = 8;
345     }
346
347     log2_max_frame_num_minus4 = get_ue_golomb(&h->gb);
348     if (log2_max_frame_num_minus4 < MIN_LOG2_MAX_FRAME_NUM - 4 ||
349         log2_max_frame_num_minus4 > MAX_LOG2_MAX_FRAME_NUM - 4) {
350         av_log(h->avctx, AV_LOG_ERROR,
351                "log2_max_frame_num_minus4 out of range (0-12): %d\n",
352                log2_max_frame_num_minus4);
353         goto fail;
354     }
355     sps->log2_max_frame_num = log2_max_frame_num_minus4 + 4;
356
357     sps->poc_type= get_ue_golomb_31(&h->gb);
358
359     if(sps->poc_type == 0){ //FIXME #define
360         sps->log2_max_poc_lsb= get_ue_golomb(&h->gb) + 4;
361     } else if(sps->poc_type == 1){//FIXME #define
362         sps->delta_pic_order_always_zero_flag= get_bits1(&h->gb);
363         sps->offset_for_non_ref_pic= get_se_golomb(&h->gb);
364         sps->offset_for_top_to_bottom_field= get_se_golomb(&h->gb);
365         sps->poc_cycle_length                = get_ue_golomb(&h->gb);
366
367         if((unsigned)sps->poc_cycle_length >= FF_ARRAY_ELEMS(sps->offset_for_ref_frame)){
368             av_log(h->avctx, AV_LOG_ERROR, "poc_cycle_length overflow %u\n", sps->poc_cycle_length);
369             goto fail;
370         }
371
372         for(i=0; i<sps->poc_cycle_length; i++)
373             sps->offset_for_ref_frame[i]= get_se_golomb(&h->gb);
374     }else if(sps->poc_type != 2){
375         av_log(h->avctx, AV_LOG_ERROR, "illegal POC type %d\n", sps->poc_type);
376         goto fail;
377     }
378
379     sps->ref_frame_count= get_ue_golomb_31(&h->gb);
380     if(sps->ref_frame_count > MAX_PICTURE_COUNT-2 || sps->ref_frame_count >= 32U){
381         av_log(h->avctx, AV_LOG_ERROR, "too many reference frames\n");
382         goto fail;
383     }
384     sps->gaps_in_frame_num_allowed_flag= get_bits1(&h->gb);
385     sps->mb_width = get_ue_golomb(&h->gb) + 1;
386     sps->mb_height= get_ue_golomb(&h->gb) + 1;
387     if((unsigned)sps->mb_width >= INT_MAX/16 || (unsigned)sps->mb_height >= INT_MAX/16 ||
388        av_image_check_size(16*sps->mb_width, 16*sps->mb_height, 0, h->avctx)){
389         av_log(h->avctx, AV_LOG_ERROR, "mb_width/height overflow\n");
390         goto fail;
391     }
392
393     sps->frame_mbs_only_flag= get_bits1(&h->gb);
394     if(!sps->frame_mbs_only_flag)
395         sps->mb_aff= get_bits1(&h->gb);
396     else
397         sps->mb_aff= 0;
398
399     sps->direct_8x8_inference_flag= get_bits1(&h->gb);
400     if(!sps->frame_mbs_only_flag && !sps->direct_8x8_inference_flag){
401         av_log(h->avctx, AV_LOG_ERROR, "This stream was generated by a broken encoder, invalid 8x8 inference\n");
402         goto fail;
403     }
404
405 #ifndef ALLOW_INTERLACE
406     if(sps->mb_aff)
407         av_log(h->avctx, AV_LOG_ERROR, "MBAFF support not included; enable it at compile-time.\n");
408 #endif
409     sps->crop= get_bits1(&h->gb);
410     if(sps->crop){
411         int crop_left   = get_ue_golomb(&h->gb);
412         int crop_right  = get_ue_golomb(&h->gb);
413         int crop_top    = get_ue_golomb(&h->gb);
414         int crop_bottom = get_ue_golomb(&h->gb);
415
416         if (h->avctx->flags2 & CODEC_FLAG2_IGNORE_CROP) {
417             av_log(h->avctx, AV_LOG_DEBUG, "discarding sps cropping, original "
418                    "values are l:%u r:%u t:%u b:%u\n", crop_left, crop_right,
419                    crop_top, crop_bottom);
420
421             sps->crop_left   =
422             sps->crop_right  =
423             sps->crop_top    =
424             sps->crop_bottom = 0;
425         } else {
426             int vsub = (sps->chroma_format_idc == 1) ? 1 : 0;
427             int hsub = (sps->chroma_format_idc == 1 || sps->chroma_format_idc == 2) ? 1 : 0;
428             int step_x = 1 << hsub;
429             int step_y = (2 - sps->frame_mbs_only_flag) << vsub;
430
431             if (crop_left & (0x1F >> (sps->bit_depth_luma > 8)) &&
432                 !(h->avctx->flags & CODEC_FLAG_UNALIGNED)) {
433                 crop_left &= ~(0x1F >> (sps->bit_depth_luma > 8));
434                 av_log(h->avctx, AV_LOG_WARNING, "Reducing left cropping to %d "
435                        "chroma samples to preserve alignment.\n",
436                        crop_left);
437             }
438
439             sps->crop_left   = crop_left   * step_x;
440             sps->crop_right  = crop_right  * step_x;
441             sps->crop_top    = crop_top    * step_y;
442             sps->crop_bottom = crop_bottom * step_y;
443         }
444     }else{
445         sps->crop_left  =
446         sps->crop_right =
447         sps->crop_top   =
448         sps->crop_bottom= 0;
449         sps->crop = 0;
450     }
451
452     sps->vui_parameters_present_flag= get_bits1(&h->gb);
453     if( sps->vui_parameters_present_flag )
454         if (decode_vui_parameters(h, sps) < 0)
455             goto fail;
456
457     if(!sps->sar.den)
458         sps->sar.den= 1;
459
460     if(h->avctx->debug&FF_DEBUG_PICT_INFO){
461         static const char csp[4][5] = { "Gray", "420", "422", "444" };
462         av_log(h->avctx, AV_LOG_DEBUG, "sps:%u profile:%d/%d poc:%d ref:%d %dx%d %s %s crop:%d/%d/%d/%d %s %s %d/%d\n",
463                sps_id, sps->profile_idc, sps->level_idc,
464                sps->poc_type,
465                sps->ref_frame_count,
466                sps->mb_width, sps->mb_height,
467                sps->frame_mbs_only_flag ? "FRM" : (sps->mb_aff ? "MB-AFF" : "PIC-AFF"),
468                sps->direct_8x8_inference_flag ? "8B8" : "",
469                sps->crop_left, sps->crop_right,
470                sps->crop_top, sps->crop_bottom,
471                sps->vui_parameters_present_flag ? "VUI" : "",
472                csp[sps->chroma_format_idc],
473                sps->timing_info_present_flag ? sps->num_units_in_tick : 0,
474                sps->timing_info_present_flag ? sps->time_scale : 0
475                );
476     }
477     sps->new = 1;
478
479     av_free(h->sps_buffers[sps_id]);
480     h->sps_buffers[sps_id] = sps;
481     h->sps                 = *sps;
482     h->current_sps_id      = sps_id;
483
484     return 0;
485 fail:
486     av_free(sps);
487     return -1;
488 }
489
490 static void
491 build_qp_table(PPS *pps, int t, int index, const int depth)
492 {
493     int i;
494     const int max_qp = 51 + 6*(depth-8);
495     for(i = 0; i < max_qp+1; i++)
496         pps->chroma_qp_table[t][i] = ff_h264_chroma_qp[depth-8][av_clip(i + index, 0, max_qp)];
497 }
498
499 int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length){
500     unsigned int pps_id= get_ue_golomb(&h->gb);
501     PPS *pps;
502     const int qp_bd_offset = 6*(h->sps.bit_depth_luma-8);
503     int bits_left;
504
505     if(pps_id >= MAX_PPS_COUNT) {
506         av_log(h->avctx, AV_LOG_ERROR, "pps_id (%d) out of range\n", pps_id);
507         return -1;
508     } else if (h->sps.bit_depth_luma > 10) {
509         av_log(h->avctx, AV_LOG_ERROR, "Unimplemented luma bit depth=%d (max=10)\n", h->sps.bit_depth_luma);
510         return AVERROR_PATCHWELCOME;
511     }
512
513     pps= av_mallocz(sizeof(PPS));
514     if(pps == NULL)
515         return -1;
516     pps->sps_id= get_ue_golomb_31(&h->gb);
517     if((unsigned)pps->sps_id>=MAX_SPS_COUNT || h->sps_buffers[pps->sps_id] == NULL){
518         av_log(h->avctx, AV_LOG_ERROR, "sps_id out of range\n");
519         goto fail;
520     }
521
522     pps->cabac= get_bits1(&h->gb);
523     pps->pic_order_present= get_bits1(&h->gb);
524     pps->slice_group_count= get_ue_golomb(&h->gb) + 1;
525     if(pps->slice_group_count > 1 ){
526         pps->mb_slice_group_map_type= get_ue_golomb(&h->gb);
527         av_log(h->avctx, AV_LOG_ERROR, "FMO not supported\n");
528         switch(pps->mb_slice_group_map_type){
529         case 0:
530 #if 0
531 |   for( i = 0; i <= num_slice_groups_minus1; i++ ) |   |        |
532 |    run_length[ i ]                                |1  |ue(v)   |
533 #endif
534             break;
535         case 2:
536 #if 0
537 |   for( i = 0; i < num_slice_groups_minus1; i++ )  |   |        |
538 |{                                                  |   |        |
539 |    top_left_mb[ i ]                               |1  |ue(v)   |
540 |    bottom_right_mb[ i ]                           |1  |ue(v)   |
541 |   }                                               |   |        |
542 #endif
543             break;
544         case 3:
545         case 4:
546         case 5:
547 #if 0
548 |   slice_group_change_direction_flag               |1  |u(1)    |
549 |   slice_group_change_rate_minus1                  |1  |ue(v)   |
550 #endif
551             break;
552         case 6:
553 #if 0
554 |   slice_group_id_cnt_minus1                       |1  |ue(v)   |
555 |   for( i = 0; i <= slice_group_id_cnt_minus1; i++ |   |        |
556 |)                                                  |   |        |
557 |    slice_group_id[ i ]                            |1  |u(v)    |
558 #endif
559             break;
560         }
561     }
562     pps->ref_count[0]= get_ue_golomb(&h->gb) + 1;
563     pps->ref_count[1]= get_ue_golomb(&h->gb) + 1;
564     if(pps->ref_count[0]-1 > 32-1 || pps->ref_count[1]-1 > 32-1){
565         av_log(h->avctx, AV_LOG_ERROR, "reference overflow (pps)\n");
566         goto fail;
567     }
568
569     pps->weighted_pred= get_bits1(&h->gb);
570     pps->weighted_bipred_idc= get_bits(&h->gb, 2);
571     pps->init_qp= get_se_golomb(&h->gb) + 26 + qp_bd_offset;
572     pps->init_qs= get_se_golomb(&h->gb) + 26 + qp_bd_offset;
573     pps->chroma_qp_index_offset[0]= get_se_golomb(&h->gb);
574     pps->deblocking_filter_parameters_present= get_bits1(&h->gb);
575     pps->constrained_intra_pred= get_bits1(&h->gb);
576     pps->redundant_pic_cnt_present = get_bits1(&h->gb);
577
578     pps->transform_8x8_mode= 0;
579     h->dequant_coeff_pps= -1; //contents of sps/pps can change even if id doesn't, so reinit
580     memcpy(pps->scaling_matrix4, h->sps_buffers[pps->sps_id]->scaling_matrix4, sizeof(pps->scaling_matrix4));
581     memcpy(pps->scaling_matrix8, h->sps_buffers[pps->sps_id]->scaling_matrix8, sizeof(pps->scaling_matrix8));
582
583     bits_left = bit_length - get_bits_count(&h->gb);
584     if (bits_left && (bits_left > 8 ||
585                       show_bits(&h->gb, bits_left) != 1 << (bits_left - 1))) {
586         pps->transform_8x8_mode= get_bits1(&h->gb);
587         decode_scaling_matrices(h, h->sps_buffers[pps->sps_id], pps, 0, pps->scaling_matrix4, pps->scaling_matrix8);
588         pps->chroma_qp_index_offset[1]= get_se_golomb(&h->gb); //second_chroma_qp_index_offset
589     } else {
590         pps->chroma_qp_index_offset[1]= pps->chroma_qp_index_offset[0];
591     }
592
593     build_qp_table(pps, 0, pps->chroma_qp_index_offset[0], h->sps.bit_depth_luma);
594     build_qp_table(pps, 1, pps->chroma_qp_index_offset[1], h->sps.bit_depth_luma);
595     if(pps->chroma_qp_index_offset[0] != pps->chroma_qp_index_offset[1])
596         pps->chroma_qp_diff= 1;
597
598     if(h->avctx->debug&FF_DEBUG_PICT_INFO){
599         av_log(h->avctx, AV_LOG_DEBUG, "pps:%u sps:%u %s slice_groups:%d ref:%d/%d %s qp:%d/%d/%d/%d %s %s %s %s\n",
600                pps_id, pps->sps_id,
601                pps->cabac ? "CABAC" : "CAVLC",
602                pps->slice_group_count,
603                pps->ref_count[0], pps->ref_count[1],
604                pps->weighted_pred ? "weighted" : "",
605                pps->init_qp, pps->init_qs, pps->chroma_qp_index_offset[0], pps->chroma_qp_index_offset[1],
606                pps->deblocking_filter_parameters_present ? "LPAR" : "",
607                pps->constrained_intra_pred ? "CONSTR" : "",
608                pps->redundant_pic_cnt_present ? "REDU" : "",
609                pps->transform_8x8_mode ? "8x8DCT" : ""
610                );
611     }
612
613     av_free(h->pps_buffers[pps_id]);
614     h->pps_buffers[pps_id]= pps;
615     return 0;
616 fail:
617     av_free(pps);
618     return -1;
619 }