c6587c791b5c8fb53e3b83b352790984b59be2e6
[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
36 //#undef NDEBUG
37 #include <assert.h>
38
39 #define MAX_LOG2_MAX_FRAME_NUM    (12 + 4)
40 #define MIN_LOG2_MAX_FRAME_NUM    4
41
42 static const AVRational pixel_aspect[17]={
43  {0, 1},
44  {1, 1},
45  {12, 11},
46  {10, 11},
47  {16, 11},
48  {40, 33},
49  {24, 11},
50  {20, 11},
51  {32, 11},
52  {80, 33},
53  {18, 11},
54  {15, 11},
55  {64, 33},
56  {160,99},
57  {4, 3},
58  {3, 2},
59  {2, 1},
60 };
61
62 #define QP(qP,depth) ( (qP)+6*((depth)-8) )
63
64 #define CHROMA_QP_TABLE_END(d) \
65      QP(0,d),  QP(1,d),  QP(2,d),  QP(3,d),  QP(4,d),  QP(5,d),\
66      QP(6,d),  QP(7,d),  QP(8,d),  QP(9,d), QP(10,d), QP(11,d),\
67     QP(12,d), QP(13,d), QP(14,d), QP(15,d), QP(16,d), QP(17,d),\
68     QP(18,d), QP(19,d), QP(20,d), QP(21,d), QP(22,d), QP(23,d),\
69     QP(24,d), QP(25,d), QP(26,d), QP(27,d), QP(28,d), QP(29,d),\
70     QP(29,d), QP(30,d), QP(31,d), QP(32,d), QP(32,d), QP(33,d),\
71     QP(34,d), QP(34,d), QP(35,d), QP(35,d), QP(36,d), QP(36,d),\
72     QP(37,d), QP(37,d), QP(37,d), QP(38,d), QP(38,d), QP(38,d),\
73     QP(39,d), QP(39,d), QP(39,d), QP(39,d)
74
75 const uint8_t ff_h264_chroma_qp[3][QP_MAX_NUM+1] = {
76     {
77         CHROMA_QP_TABLE_END(8)
78     },
79     {
80         0, 1, 2, 3, 4, 5,
81         CHROMA_QP_TABLE_END(9)
82     },
83     {
84         0, 1, 2, 3,  4,  5,
85         6, 7, 8, 9, 10, 11,
86         CHROMA_QP_TABLE_END(10)
87     },
88 };
89
90 static const uint8_t default_scaling4[2][16]={
91 {   6,13,20,28,
92    13,20,28,32,
93    20,28,32,37,
94    28,32,37,42
95 },{
96    10,14,20,24,
97    14,20,24,27,
98    20,24,27,30,
99    24,27,30,34
100 }};
101
102 static const uint8_t default_scaling8[2][64]={
103 {   6,10,13,16,18,23,25,27,
104    10,11,16,18,23,25,27,29,
105    13,16,18,23,25,27,29,31,
106    16,18,23,25,27,29,31,33,
107    18,23,25,27,29,31,33,36,
108    23,25,27,29,31,33,36,38,
109    25,27,29,31,33,36,38,40,
110    27,29,31,33,36,38,40,42
111 },{
112     9,13,15,17,19,21,22,24,
113    13,13,17,19,21,22,24,25,
114    15,17,19,21,22,24,25,27,
115    17,19,21,22,24,25,27,28,
116    19,21,22,24,25,27,28,30,
117    21,22,24,25,27,28,30,32,
118    22,24,25,27,28,30,32,33,
119    24,25,27,28,30,32,33,35
120 }};
121
122 static inline int decode_hrd_parameters(H264Context *h, SPS *sps){
123     int cpb_count, i;
124     cpb_count = get_ue_golomb_31(&h->gb) + 1;
125
126     if(cpb_count > 32U){
127         av_log(h->avctx, AV_LOG_ERROR, "cpb_count %d invalid\n", cpb_count);
128         return -1;
129     }
130
131     get_bits(&h->gb, 4); /* bit_rate_scale */
132     get_bits(&h->gb, 4); /* cpb_size_scale */
133     for(i=0; i<cpb_count; i++){
134         get_ue_golomb_long(&h->gb); /* bit_rate_value_minus1 */
135         get_ue_golomb_long(&h->gb); /* cpb_size_value_minus1 */
136         get_bits1(&h->gb);     /* cbr_flag */
137     }
138     sps->initial_cpb_removal_delay_length = get_bits(&h->gb, 5) + 1;
139     sps->cpb_removal_delay_length = get_bits(&h->gb, 5) + 1;
140     sps->dpb_output_delay_length = get_bits(&h->gb, 5) + 1;
141     sps->time_offset_length = get_bits(&h->gb, 5);
142     sps->cpb_cnt = cpb_count;
143     return 0;
144 }
145
146 static inline int decode_vui_parameters(H264Context *h, SPS *sps){
147     int aspect_ratio_info_present_flag;
148     unsigned int aspect_ratio_idc;
149
150     aspect_ratio_info_present_flag= get_bits1(&h->gb);
151
152     if( aspect_ratio_info_present_flag ) {
153         aspect_ratio_idc= get_bits(&h->gb, 8);
154         if( aspect_ratio_idc == EXTENDED_SAR ) {
155             sps->sar.num= get_bits(&h->gb, 16);
156             sps->sar.den= get_bits(&h->gb, 16);
157         }else if(aspect_ratio_idc < FF_ARRAY_ELEMS(pixel_aspect)){
158             sps->sar=  pixel_aspect[aspect_ratio_idc];
159         }else{
160             av_log(h->avctx, AV_LOG_ERROR, "illegal aspect ratio\n");
161             return -1;
162         }
163     }else{
164         sps->sar.num=
165         sps->sar.den= 0;
166     }
167 //            s->avctx->aspect_ratio= sar_width*s->width / (float)(s->height*sar_height);
168
169     if(get_bits1(&h->gb)){      /* overscan_info_present_flag */
170         get_bits1(&h->gb);      /* overscan_appropriate_flag */
171     }
172
173     sps->video_signal_type_present_flag = get_bits1(&h->gb);
174     if(sps->video_signal_type_present_flag){
175         get_bits(&h->gb, 3);    /* video_format */
176         sps->full_range = get_bits1(&h->gb); /* video_full_range_flag */
177
178         sps->colour_description_present_flag = get_bits1(&h->gb);
179         if(sps->colour_description_present_flag){
180             sps->color_primaries = get_bits(&h->gb, 8); /* colour_primaries */
181             sps->color_trc       = get_bits(&h->gb, 8); /* transfer_characteristics */
182             sps->colorspace      = get_bits(&h->gb, 8); /* matrix_coefficients */
183             if (sps->color_primaries >= AVCOL_PRI_NB)
184                 sps->color_primaries  = AVCOL_PRI_UNSPECIFIED;
185             if (sps->color_trc >= AVCOL_TRC_NB)
186                 sps->color_trc  = AVCOL_TRC_UNSPECIFIED;
187             if (sps->colorspace >= AVCOL_SPC_NB)
188                 sps->colorspace  = AVCOL_SPC_UNSPECIFIED;
189         }
190     }
191
192     if(get_bits1(&h->gb)){      /* chroma_location_info_present_flag */
193         h->avctx->chroma_sample_location = get_ue_golomb(&h->gb)+1;  /* chroma_sample_location_type_top_field */
194         get_ue_golomb(&h->gb);  /* chroma_sample_location_type_bottom_field */
195     }
196
197     sps->timing_info_present_flag = get_bits1(&h->gb);
198     if(sps->timing_info_present_flag){
199         sps->num_units_in_tick = get_bits_long(&h->gb, 32);
200         sps->time_scale = get_bits_long(&h->gb, 32);
201         if(!sps->num_units_in_tick || !sps->time_scale){
202             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);
203             return -1;
204         }
205         sps->fixed_frame_rate_flag = get_bits1(&h->gb);
206     }
207
208     sps->nal_hrd_parameters_present_flag = get_bits1(&h->gb);
209     if(sps->nal_hrd_parameters_present_flag)
210         if(decode_hrd_parameters(h, sps) < 0)
211             return -1;
212     sps->vcl_hrd_parameters_present_flag = get_bits1(&h->gb);
213     if(sps->vcl_hrd_parameters_present_flag)
214         if(decode_hrd_parameters(h, sps) < 0)
215             return -1;
216     if(sps->nal_hrd_parameters_present_flag || sps->vcl_hrd_parameters_present_flag)
217         get_bits1(&h->gb);     /* low_delay_hrd_flag */
218     sps->pic_struct_present_flag = get_bits1(&h->gb);
219
220     sps->bitstream_restriction_flag = get_bits1(&h->gb);
221     if(sps->bitstream_restriction_flag){
222         get_bits1(&h->gb);     /* motion_vectors_over_pic_boundaries_flag */
223         get_ue_golomb(&h->gb); /* max_bytes_per_pic_denom */
224         get_ue_golomb(&h->gb); /* max_bits_per_mb_denom */
225         get_ue_golomb(&h->gb); /* log2_max_mv_length_horizontal */
226         get_ue_golomb(&h->gb); /* log2_max_mv_length_vertical */
227         sps->num_reorder_frames= get_ue_golomb(&h->gb);
228         get_ue_golomb(&h->gb); /*max_dec_frame_buffering*/
229
230         if (get_bits_left(&h->gb) < 0) {
231             sps->num_reorder_frames=0;
232             sps->bitstream_restriction_flag= 0;
233         }
234
235         if(sps->num_reorder_frames > 16U /*max_dec_frame_buffering || max_dec_frame_buffering > 16*/){
236             av_log(h->avctx, AV_LOG_ERROR, "illegal num_reorder_frames %d\n", sps->num_reorder_frames);
237             return -1;
238         }
239     }
240     if (get_bits_left(&h->gb) < 0) {
241         av_log(h->avctx, AV_LOG_ERROR, "Overread VUI by %d bits\n", -get_bits_left(&h->gb));
242         return AVERROR_INVALIDDATA;
243     }
244
245     return 0;
246 }
247
248 static void decode_scaling_list(H264Context *h, uint8_t *factors, int size,
249                                 const uint8_t *jvt_list, const uint8_t *fallback_list){
250     int i, last = 8, next = 8;
251     const uint8_t *scan = size == 16 ? zigzag_scan : ff_zigzag_direct;
252     if(!get_bits1(&h->gb)) /* matrix not written, we use the predicted one */
253         memcpy(factors, fallback_list, size*sizeof(uint8_t));
254     else
255     for(i=0;i<size;i++){
256         if(next)
257             next = (last + get_se_golomb(&h->gb)) & 0xff;
258         if(!i && !next){ /* matrix not written, we use the preset one */
259             memcpy(factors, jvt_list, size*sizeof(uint8_t));
260             break;
261         }
262         last = factors[scan[i]] = next ? next : last;
263     }
264 }
265
266 static void decode_scaling_matrices(H264Context *h, SPS *sps, PPS *pps, int is_sps,
267                                    uint8_t (*scaling_matrix4)[16], uint8_t (*scaling_matrix8)[64]){
268     int fallback_sps = !is_sps && sps->scaling_matrix_present;
269     const uint8_t *fallback[4] = {
270         fallback_sps ? sps->scaling_matrix4[0] : default_scaling4[0],
271         fallback_sps ? sps->scaling_matrix4[3] : default_scaling4[1],
272         fallback_sps ? sps->scaling_matrix8[0] : default_scaling8[0],
273         fallback_sps ? sps->scaling_matrix8[3] : default_scaling8[1]
274     };
275     if(get_bits1(&h->gb)){
276         sps->scaling_matrix_present |= is_sps;
277         decode_scaling_list(h,scaling_matrix4[0],16,default_scaling4[0],fallback[0]); // Intra, Y
278         decode_scaling_list(h,scaling_matrix4[1],16,default_scaling4[0],scaling_matrix4[0]); // Intra, Cr
279         decode_scaling_list(h,scaling_matrix4[2],16,default_scaling4[0],scaling_matrix4[1]); // Intra, Cb
280         decode_scaling_list(h,scaling_matrix4[3],16,default_scaling4[1],fallback[1]); // Inter, Y
281         decode_scaling_list(h,scaling_matrix4[4],16,default_scaling4[1],scaling_matrix4[3]); // Inter, Cr
282         decode_scaling_list(h,scaling_matrix4[5],16,default_scaling4[1],scaling_matrix4[4]); // Inter, Cb
283         if(is_sps || pps->transform_8x8_mode){
284             decode_scaling_list(h,scaling_matrix8[0],64,default_scaling8[0],fallback[2]);  // Intra, Y
285             if(sps->chroma_format_idc == 3){
286                 decode_scaling_list(h,scaling_matrix8[1],64,default_scaling8[0],scaling_matrix8[0]);  // Intra, Cr
287                 decode_scaling_list(h,scaling_matrix8[2],64,default_scaling8[0],scaling_matrix8[1]);  // Intra, Cb
288             }
289             decode_scaling_list(h,scaling_matrix8[3],64,default_scaling8[1],fallback[3]);  // Inter, Y
290             if(sps->chroma_format_idc == 3){
291                 decode_scaling_list(h,scaling_matrix8[4],64,default_scaling8[1],scaling_matrix8[3]);  // Inter, Cr
292                 decode_scaling_list(h,scaling_matrix8[5],64,default_scaling8[1],scaling_matrix8[4]);  // Inter, Cb
293             }
294         }
295     }
296 }
297
298 int ff_h264_decode_seq_parameter_set(H264Context *h){
299     int profile_idc, level_idc, constraint_set_flags = 0;
300     unsigned int sps_id;
301     int i, log2_max_frame_num_minus4;
302     SPS *sps;
303
304     profile_idc= get_bits(&h->gb, 8);
305     constraint_set_flags |= get_bits1(&h->gb) << 0;   //constraint_set0_flag
306     constraint_set_flags |= get_bits1(&h->gb) << 1;   //constraint_set1_flag
307     constraint_set_flags |= get_bits1(&h->gb) << 2;   //constraint_set2_flag
308     constraint_set_flags |= get_bits1(&h->gb) << 3;   //constraint_set3_flag
309     get_bits(&h->gb, 4); // reserved
310     level_idc= get_bits(&h->gb, 8);
311     sps_id= get_ue_golomb_31(&h->gb);
312
313     if(sps_id >= MAX_SPS_COUNT) {
314         av_log(h->avctx, AV_LOG_ERROR, "sps_id (%d) out of range\n", sps_id);
315         return -1;
316     }
317     sps= av_mallocz(sizeof(SPS));
318     if(sps == NULL)
319         return -1;
320
321     sps->time_offset_length = 24;
322     sps->profile_idc= profile_idc;
323     sps->constraint_set_flags = constraint_set_flags;
324     sps->level_idc= level_idc;
325
326     memset(sps->scaling_matrix4, 16, sizeof(sps->scaling_matrix4));
327     memset(sps->scaling_matrix8, 16, sizeof(sps->scaling_matrix8));
328     sps->scaling_matrix_present = 0;
329
330     if (sps->profile_idc == 100 || sps->profile_idc == 110 ||
331         sps->profile_idc == 122 || sps->profile_idc == 244 ||
332         sps->profile_idc ==  44 || sps->profile_idc ==  83 ||
333         sps->profile_idc ==  86 || sps->profile_idc == 118 ||
334         sps->profile_idc == 128 || sps->profile_idc == 144) {
335         sps->chroma_format_idc= get_ue_golomb_31(&h->gb);
336         if(sps->chroma_format_idc > 3) {
337             av_log(h->avctx, AV_LOG_ERROR, "chroma_format_idc (%u) out of range\n", sps->chroma_format_idc);
338             goto fail;
339         } else if(sps->chroma_format_idc == 3) {
340             sps->residual_color_transform_flag = get_bits1(&h->gb);
341         }
342         sps->bit_depth_luma   = get_ue_golomb(&h->gb) + 8;
343         sps->bit_depth_chroma = get_ue_golomb(&h->gb) + 8;
344         sps->transform_bypass = get_bits1(&h->gb);
345         decode_scaling_matrices(h, sps, NULL, 1, sps->scaling_matrix4, sps->scaling_matrix8);
346     }else{
347         sps->chroma_format_idc= 1;
348         sps->bit_depth_luma   = 8;
349         sps->bit_depth_chroma = 8;
350     }
351
352     log2_max_frame_num_minus4 = get_ue_golomb(&h->gb);
353     if (log2_max_frame_num_minus4 < MIN_LOG2_MAX_FRAME_NUM - 4 ||
354         log2_max_frame_num_minus4 > MAX_LOG2_MAX_FRAME_NUM - 4) {
355         av_log(h->avctx, AV_LOG_ERROR,
356                "log2_max_frame_num_minus4 out of range (0-12): %d\n",
357                log2_max_frame_num_minus4);
358         goto fail;
359     }
360     sps->log2_max_frame_num = log2_max_frame_num_minus4 + 4;
361
362     sps->poc_type= get_ue_golomb_31(&h->gb);
363
364     if(sps->poc_type == 0){ //FIXME #define
365         sps->log2_max_poc_lsb= get_ue_golomb(&h->gb) + 4;
366     } else if(sps->poc_type == 1){//FIXME #define
367         sps->delta_pic_order_always_zero_flag= get_bits1(&h->gb);
368         sps->offset_for_non_ref_pic= get_se_golomb(&h->gb);
369         sps->offset_for_top_to_bottom_field= get_se_golomb(&h->gb);
370         sps->poc_cycle_length                = get_ue_golomb(&h->gb);
371
372         if((unsigned)sps->poc_cycle_length >= FF_ARRAY_ELEMS(sps->offset_for_ref_frame)){
373             av_log(h->avctx, AV_LOG_ERROR, "poc_cycle_length overflow %u\n", sps->poc_cycle_length);
374             goto fail;
375         }
376
377         for(i=0; i<sps->poc_cycle_length; i++)
378             sps->offset_for_ref_frame[i]= get_se_golomb(&h->gb);
379     }else if(sps->poc_type != 2){
380         av_log(h->avctx, AV_LOG_ERROR, "illegal POC type %d\n", sps->poc_type);
381         goto fail;
382     }
383
384     sps->ref_frame_count= get_ue_golomb_31(&h->gb);
385     if(sps->ref_frame_count > MAX_PICTURE_COUNT-2 || sps->ref_frame_count >= 32U){
386         av_log(h->avctx, AV_LOG_ERROR, "too many reference frames\n");
387         goto fail;
388     }
389     sps->gaps_in_frame_num_allowed_flag= get_bits1(&h->gb);
390     sps->mb_width = get_ue_golomb(&h->gb) + 1;
391     sps->mb_height= get_ue_golomb(&h->gb) + 1;
392     if((unsigned)sps->mb_width >= INT_MAX/16 || (unsigned)sps->mb_height >= INT_MAX/16 ||
393        av_image_check_size(16*sps->mb_width, 16*sps->mb_height, 0, h->avctx)){
394         av_log(h->avctx, AV_LOG_ERROR, "mb_width/height overflow\n");
395         goto fail;
396     }
397
398     sps->frame_mbs_only_flag= get_bits1(&h->gb);
399     if(!sps->frame_mbs_only_flag)
400         sps->mb_aff= get_bits1(&h->gb);
401     else
402         sps->mb_aff= 0;
403
404     sps->direct_8x8_inference_flag= get_bits1(&h->gb);
405     if(!sps->frame_mbs_only_flag && !sps->direct_8x8_inference_flag){
406         av_log(h->avctx, AV_LOG_ERROR, "This stream was generated by a broken encoder, invalid 8x8 inference\n");
407         goto fail;
408     }
409
410 #ifndef ALLOW_INTERLACE
411     if(sps->mb_aff)
412         av_log(h->avctx, AV_LOG_ERROR, "MBAFF support not included; enable it at compile-time.\n");
413 #endif
414     sps->crop= get_bits1(&h->gb);
415     if(sps->crop){
416         int crop_left   = get_ue_golomb(&h->gb);
417         int crop_right  = get_ue_golomb(&h->gb);
418         int crop_top    = get_ue_golomb(&h->gb);
419         int crop_bottom = get_ue_golomb(&h->gb);
420
421         if (h->avctx->flags2 & CODEC_FLAG2_IGNORE_CROP) {
422             av_log(h->avctx, AV_LOG_DEBUG, "discarding sps cropping, original "
423                    "values are l:%u r:%u t:%u b:%u\n", crop_left, crop_right,
424                    crop_top, crop_bottom);
425
426             sps->crop_left   =
427             sps->crop_right  =
428             sps->crop_top    =
429             sps->crop_bottom = 0;
430         } else {
431             int vsub = (sps->chroma_format_idc == 1) ? 1 : 0;
432             int hsub = (sps->chroma_format_idc == 1 || sps->chroma_format_idc == 2) ? 1 : 0;
433             int step_x = 1 << hsub;
434             int step_y = (2 - sps->frame_mbs_only_flag) << vsub;
435
436             if (crop_left & (0x1F >> (sps->bit_depth_luma > 8)) &&
437                 !(h->avctx->flags & CODEC_FLAG_UNALIGNED)) {
438                 crop_left &= ~(0x1F >> (sps->bit_depth_luma > 8));
439                 av_log(h->avctx, AV_LOG_WARNING, "Reducing left cropping to %d "
440                        "chroma samples to preserve alignment.\n",
441                        crop_left);
442             }
443
444             sps->crop_left   = crop_left   * step_x;
445             sps->crop_right  = crop_right  * step_x;
446             sps->crop_top    = crop_top    * step_y;
447             sps->crop_bottom = crop_bottom * step_y;
448         }
449     }else{
450         sps->crop_left  =
451         sps->crop_right =
452         sps->crop_top   =
453         sps->crop_bottom= 0;
454         sps->crop = 0;
455     }
456
457     sps->vui_parameters_present_flag= get_bits1(&h->gb);
458     if( sps->vui_parameters_present_flag )
459         if (decode_vui_parameters(h, sps) < 0)
460             goto fail;
461
462     if(!sps->sar.den)
463         sps->sar.den= 1;
464
465     if(h->avctx->debug&FF_DEBUG_PICT_INFO){
466         static const char csp[4][5] = { "Gray", "420", "422", "444" };
467         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",
468                sps_id, sps->profile_idc, sps->level_idc,
469                sps->poc_type,
470                sps->ref_frame_count,
471                sps->mb_width, sps->mb_height,
472                sps->frame_mbs_only_flag ? "FRM" : (sps->mb_aff ? "MB-AFF" : "PIC-AFF"),
473                sps->direct_8x8_inference_flag ? "8B8" : "",
474                sps->crop_left, sps->crop_right,
475                sps->crop_top, sps->crop_bottom,
476                sps->vui_parameters_present_flag ? "VUI" : "",
477                csp[sps->chroma_format_idc],
478                sps->timing_info_present_flag ? sps->num_units_in_tick : 0,
479                sps->timing_info_present_flag ? sps->time_scale : 0
480                );
481     }
482     sps->new = 1;
483
484     av_free(h->sps_buffers[sps_id]);
485     h->sps_buffers[sps_id] = sps;
486     h->sps                 = *sps;
487     h->current_sps_id      = sps_id;
488
489     return 0;
490 fail:
491     av_free(sps);
492     return -1;
493 }
494
495 static void
496 build_qp_table(PPS *pps, int t, int index, const int depth)
497 {
498     int i;
499     const int max_qp = 51 + 6*(depth-8);
500     for(i = 0; i < max_qp+1; i++)
501         pps->chroma_qp_table[t][i] = ff_h264_chroma_qp[depth-8][av_clip(i + index, 0, max_qp)];
502 }
503
504 int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length){
505     unsigned int pps_id= get_ue_golomb(&h->gb);
506     PPS *pps;
507     const int qp_bd_offset = 6*(h->sps.bit_depth_luma-8);
508     int bits_left;
509
510     if(pps_id >= MAX_PPS_COUNT) {
511         av_log(h->avctx, AV_LOG_ERROR, "pps_id (%d) out of range\n", pps_id);
512         return -1;
513     } else if (h->sps.bit_depth_luma > 10) {
514         av_log(h->avctx, AV_LOG_ERROR, "Unimplemented luma bit depth=%d (max=10)\n", h->sps.bit_depth_luma);
515         return AVERROR_PATCHWELCOME;
516     }
517
518     pps= av_mallocz(sizeof(PPS));
519     if(pps == NULL)
520         return -1;
521     pps->sps_id= get_ue_golomb_31(&h->gb);
522     if((unsigned)pps->sps_id>=MAX_SPS_COUNT || h->sps_buffers[pps->sps_id] == NULL){
523         av_log(h->avctx, AV_LOG_ERROR, "sps_id out of range\n");
524         goto fail;
525     }
526
527     pps->cabac= get_bits1(&h->gb);
528     pps->pic_order_present= get_bits1(&h->gb);
529     pps->slice_group_count= get_ue_golomb(&h->gb) + 1;
530     if(pps->slice_group_count > 1 ){
531         pps->mb_slice_group_map_type= get_ue_golomb(&h->gb);
532         av_log(h->avctx, AV_LOG_ERROR, "FMO not supported\n");
533         switch(pps->mb_slice_group_map_type){
534         case 0:
535 #if 0
536 |   for( i = 0; i <= num_slice_groups_minus1; i++ ) |   |        |
537 |    run_length[ i ]                                |1  |ue(v)   |
538 #endif
539             break;
540         case 2:
541 #if 0
542 |   for( i = 0; i < num_slice_groups_minus1; i++ )  |   |        |
543 |{                                                  |   |        |
544 |    top_left_mb[ i ]                               |1  |ue(v)   |
545 |    bottom_right_mb[ i ]                           |1  |ue(v)   |
546 |   }                                               |   |        |
547 #endif
548             break;
549         case 3:
550         case 4:
551         case 5:
552 #if 0
553 |   slice_group_change_direction_flag               |1  |u(1)    |
554 |   slice_group_change_rate_minus1                  |1  |ue(v)   |
555 #endif
556             break;
557         case 6:
558 #if 0
559 |   slice_group_id_cnt_minus1                       |1  |ue(v)   |
560 |   for( i = 0; i <= slice_group_id_cnt_minus1; i++ |   |        |
561 |)                                                  |   |        |
562 |    slice_group_id[ i ]                            |1  |u(v)    |
563 #endif
564             break;
565         }
566     }
567     pps->ref_count[0]= get_ue_golomb(&h->gb) + 1;
568     pps->ref_count[1]= get_ue_golomb(&h->gb) + 1;
569     if(pps->ref_count[0]-1 > 32-1 || pps->ref_count[1]-1 > 32-1){
570         av_log(h->avctx, AV_LOG_ERROR, "reference overflow (pps)\n");
571         goto fail;
572     }
573
574     pps->weighted_pred= get_bits1(&h->gb);
575     pps->weighted_bipred_idc= get_bits(&h->gb, 2);
576     pps->init_qp= get_se_golomb(&h->gb) + 26 + qp_bd_offset;
577     pps->init_qs= get_se_golomb(&h->gb) + 26 + qp_bd_offset;
578     pps->chroma_qp_index_offset[0]= get_se_golomb(&h->gb);
579     pps->deblocking_filter_parameters_present= get_bits1(&h->gb);
580     pps->constrained_intra_pred= get_bits1(&h->gb);
581     pps->redundant_pic_cnt_present = get_bits1(&h->gb);
582
583     pps->transform_8x8_mode= 0;
584     h->dequant_coeff_pps= -1; //contents of sps/pps can change even if id doesn't, so reinit
585     memcpy(pps->scaling_matrix4, h->sps_buffers[pps->sps_id]->scaling_matrix4, sizeof(pps->scaling_matrix4));
586     memcpy(pps->scaling_matrix8, h->sps_buffers[pps->sps_id]->scaling_matrix8, sizeof(pps->scaling_matrix8));
587
588     bits_left = bit_length - get_bits_count(&h->gb);
589     if (bits_left && (bits_left > 8 ||
590                       show_bits(&h->gb, bits_left) != 1 << (bits_left - 1))) {
591         pps->transform_8x8_mode= get_bits1(&h->gb);
592         decode_scaling_matrices(h, h->sps_buffers[pps->sps_id], pps, 0, pps->scaling_matrix4, pps->scaling_matrix8);
593         pps->chroma_qp_index_offset[1]= get_se_golomb(&h->gb); //second_chroma_qp_index_offset
594     } else {
595         pps->chroma_qp_index_offset[1]= pps->chroma_qp_index_offset[0];
596     }
597
598     build_qp_table(pps, 0, pps->chroma_qp_index_offset[0], h->sps.bit_depth_luma);
599     build_qp_table(pps, 1, pps->chroma_qp_index_offset[1], h->sps.bit_depth_luma);
600     if(pps->chroma_qp_index_offset[0] != pps->chroma_qp_index_offset[1])
601         pps->chroma_qp_diff= 1;
602
603     if(h->avctx->debug&FF_DEBUG_PICT_INFO){
604         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",
605                pps_id, pps->sps_id,
606                pps->cabac ? "CABAC" : "CAVLC",
607                pps->slice_group_count,
608                pps->ref_count[0], pps->ref_count[1],
609                pps->weighted_pred ? "weighted" : "",
610                pps->init_qp, pps->init_qs, pps->chroma_qp_index_offset[0], pps->chroma_qp_index_offset[1],
611                pps->deblocking_filter_parameters_present ? "LPAR" : "",
612                pps->constrained_intra_pred ? "CONSTR" : "",
613                pps->redundant_pic_cnt_present ? "REDU" : "",
614                pps->transform_8x8_mode ? "8x8DCT" : ""
615                );
616     }
617
618     av_free(h->pps_buffers[pps_id]);
619     h->pps_buffers[pps_id]= pps;
620     return 0;
621 fail:
622     av_free(pps);
623     return -1;
624 }