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