Libav
h264_ps.c
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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 
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 
72  { CHROMA_QP_TABLE_END(8) },
73  { 0, 1, 2, 3, 4, 5,
75  { 0, 1, 2, 3, 4, 5,
76  6, 7, 8, 9, 10, 11,
77  CHROMA_QP_TABLE_END(10) },
78 };
79 
80 static const uint8_t default_scaling4[2][16] = {
81  { 6, 13, 20, 28, 13, 20, 28, 32,
82  20, 28, 32, 37, 28, 32, 37, 42 },
83  { 10, 14, 20, 24, 14, 20, 24, 27,
84  20, 24, 27, 30, 24, 27, 30, 34 }
85 };
86 
87 static const uint8_t default_scaling8[2][64] = {
88  { 6, 10, 13, 16, 18, 23, 25, 27,
89  10, 11, 16, 18, 23, 25, 27, 29,
90  13, 16, 18, 23, 25, 27, 29, 31,
91  16, 18, 23, 25, 27, 29, 31, 33,
92  18, 23, 25, 27, 29, 31, 33, 36,
93  23, 25, 27, 29, 31, 33, 36, 38,
94  25, 27, 29, 31, 33, 36, 38, 40,
95  27, 29, 31, 33, 36, 38, 40, 42 },
96  { 9, 13, 15, 17, 19, 21, 22, 24,
97  13, 13, 17, 19, 21, 22, 24, 25,
98  15, 17, 19, 21, 22, 24, 25, 27,
99  17, 19, 21, 22, 24, 25, 27, 28,
100  19, 21, 22, 24, 25, 27, 28, 30,
101  21, 22, 24, 25, 27, 28, 30, 32,
102  22, 24, 25, 27, 28, 30, 32, 33,
103  24, 25, 27, 28, 30, 32, 33, 35 }
104 };
105 
106 static inline int decode_hrd_parameters(H264Context *h, SPS *sps)
107 {
108  int cpb_count, i;
109  cpb_count = get_ue_golomb_31(&h->gb) + 1;
110 
111  if (cpb_count > 32U) {
112  av_log(h->avctx, AV_LOG_ERROR, "cpb_count %d invalid\n", cpb_count);
113  return AVERROR_INVALIDDATA;
114  }
115 
116  get_bits(&h->gb, 4); /* bit_rate_scale */
117  get_bits(&h->gb, 4); /* cpb_size_scale */
118  for (i = 0; i < cpb_count; i++) {
119  get_ue_golomb_long(&h->gb); /* bit_rate_value_minus1 */
120  get_ue_golomb_long(&h->gb); /* cpb_size_value_minus1 */
121  get_bits1(&h->gb); /* cbr_flag */
122  }
123  sps->initial_cpb_removal_delay_length = get_bits(&h->gb, 5) + 1;
124  sps->cpb_removal_delay_length = get_bits(&h->gb, 5) + 1;
125  sps->dpb_output_delay_length = get_bits(&h->gb, 5) + 1;
126  sps->time_offset_length = get_bits(&h->gb, 5);
127  sps->cpb_cnt = cpb_count;
128  return 0;
129 }
130 
131 static inline int decode_vui_parameters(H264Context *h, SPS *sps)
132 {
133  int aspect_ratio_info_present_flag;
134  unsigned int aspect_ratio_idc;
135 
136  aspect_ratio_info_present_flag = get_bits1(&h->gb);
137 
138  if (aspect_ratio_info_present_flag) {
139  aspect_ratio_idc = get_bits(&h->gb, 8);
140  if (aspect_ratio_idc == EXTENDED_SAR) {
141  sps->sar.num = get_bits(&h->gb, 16);
142  sps->sar.den = get_bits(&h->gb, 16);
143  } else if (aspect_ratio_idc < FF_ARRAY_ELEMS(pixel_aspect)) {
144  sps->sar = pixel_aspect[aspect_ratio_idc];
145  } else {
146  av_log(h->avctx, AV_LOG_ERROR, "illegal aspect ratio\n");
147  return AVERROR_INVALIDDATA;
148  }
149  } else {
150  sps->sar.num =
151  sps->sar.den = 0;
152  }
153 
154  if (get_bits1(&h->gb)) /* overscan_info_present_flag */
155  get_bits1(&h->gb); /* overscan_appropriate_flag */
156 
159  get_bits(&h->gb, 3); /* video_format */
160  sps->full_range = get_bits1(&h->gb); /* video_full_range_flag */
161 
164  sps->color_primaries = get_bits(&h->gb, 8); /* colour_primaries */
165  sps->color_trc = get_bits(&h->gb, 8); /* transfer_characteristics */
166  sps->colorspace = get_bits(&h->gb, 8); /* matrix_coefficients */
167  if (sps->color_primaries >= AVCOL_PRI_NB)
169  if (sps->color_trc >= AVCOL_TRC_NB)
171  if (sps->colorspace >= AVCOL_SPC_NB)
173  }
174  }
175 
176  /* chroma_location_info_present_flag */
177  if (get_bits1(&h->gb)) {
178  /* chroma_sample_location_type_top_field */
180  get_ue_golomb(&h->gb); /* chroma_sample_location_type_bottom_field */
181  }
182 
184  if (sps->timing_info_present_flag) {
185  sps->num_units_in_tick = get_bits_long(&h->gb, 32);
186  sps->time_scale = get_bits_long(&h->gb, 32);
187  if (!sps->num_units_in_tick || !sps->time_scale) {
189  "time_scale/num_units_in_tick invalid or unsupported (%d/%d)\n",
190  sps->time_scale, sps->num_units_in_tick);
191  return AVERROR_INVALIDDATA;
192  }
193  sps->fixed_frame_rate_flag = get_bits1(&h->gb);
194  }
195 
198  if (decode_hrd_parameters(h, sps) < 0)
199  return AVERROR_INVALIDDATA;
202  if (decode_hrd_parameters(h, sps) < 0)
203  return AVERROR_INVALIDDATA;
206  get_bits1(&h->gb); /* low_delay_hrd_flag */
208 
210  if (sps->bitstream_restriction_flag) {
211  get_bits1(&h->gb); /* motion_vectors_over_pic_boundaries_flag */
212  get_ue_golomb(&h->gb); /* max_bytes_per_pic_denom */
213  get_ue_golomb(&h->gb); /* max_bits_per_mb_denom */
214  get_ue_golomb(&h->gb); /* log2_max_mv_length_horizontal */
215  get_ue_golomb(&h->gb); /* log2_max_mv_length_vertical */
216  sps->num_reorder_frames = get_ue_golomb(&h->gb);
217  get_ue_golomb(&h->gb); /*max_dec_frame_buffering*/
218 
219  if (get_bits_left(&h->gb) < 0) {
220  sps->num_reorder_frames = 0;
222  }
223 
224  if (sps->num_reorder_frames > 16U
225  /* max_dec_frame_buffering || max_dec_frame_buffering > 16 */) {
227  "Clipping illegal num_reorder_frames %d\n",
228  sps->num_reorder_frames);
229  sps->num_reorder_frames = 16;
230  return AVERROR_INVALIDDATA;
231  }
232  }
233  if (get_bits_left(&h->gb) < 0) {
235  "Overread VUI by %d bits\n", -get_bits_left(&h->gb));
236  return AVERROR_INVALIDDATA;
237  }
238 
239  return 0;
240 }
241 
242 static void decode_scaling_list(H264Context *h, uint8_t *factors, int size,
243  const uint8_t *jvt_list,
244  const uint8_t *fallback_list)
245 {
246  int i, last = 8, next = 8;
247  const uint8_t *scan = size == 16 ? zigzag_scan : ff_zigzag_direct;
248  if (!get_bits1(&h->gb)) /* matrix not written, we use the predicted one */
249  memcpy(factors, fallback_list, size * sizeof(uint8_t));
250  else
251  for (i = 0; i < size; i++) {
252  if (next)
253  next = (last + get_se_golomb(&h->gb)) & 0xff;
254  if (!i && !next) { /* matrix not written, we use the preset one */
255  memcpy(factors, jvt_list, size * sizeof(uint8_t));
256  break;
257  }
258  last = factors[scan[i]] = next ? next : last;
259  }
260 }
261 
263  PPS *pps, int is_sps,
264  uint8_t(*scaling_matrix4)[16],
265  uint8_t(*scaling_matrix8)[64])
266 {
267  int fallback_sps = !is_sps && sps->scaling_matrix_present;
268  const uint8_t *fallback[4] = {
269  fallback_sps ? sps->scaling_matrix4[0] : default_scaling4[0],
270  fallback_sps ? sps->scaling_matrix4[3] : default_scaling4[1],
271  fallback_sps ? sps->scaling_matrix8[0] : default_scaling8[0],
272  fallback_sps ? sps->scaling_matrix8[3] : default_scaling8[1]
273  };
274  if (get_bits1(&h->gb)) {
275  sps->scaling_matrix_present |= is_sps;
276  decode_scaling_list(h, scaling_matrix4[0], 16, default_scaling4[0], fallback[0]); // Intra, Y
277  decode_scaling_list(h, scaling_matrix4[1], 16, default_scaling4[0], scaling_matrix4[0]); // Intra, Cr
278  decode_scaling_list(h, scaling_matrix4[2], 16, default_scaling4[0], scaling_matrix4[1]); // Intra, Cb
279  decode_scaling_list(h, scaling_matrix4[3], 16, default_scaling4[1], fallback[1]); // Inter, Y
280  decode_scaling_list(h, scaling_matrix4[4], 16, default_scaling4[1], scaling_matrix4[3]); // Inter, Cr
281  decode_scaling_list(h, scaling_matrix4[5], 16, default_scaling4[1], scaling_matrix4[4]); // Inter, Cb
282  if (is_sps || pps->transform_8x8_mode) {
283  decode_scaling_list(h, scaling_matrix8[0], 64, default_scaling8[0], fallback[2]); // Intra, Y
284  if (sps->chroma_format_idc == 3) {
285  decode_scaling_list(h, scaling_matrix8[1], 64, default_scaling8[0], scaling_matrix8[0]); // Intra, Cr
286  decode_scaling_list(h, scaling_matrix8[2], 64, default_scaling8[0], scaling_matrix8[1]); // Intra, Cb
287  }
288  decode_scaling_list(h, scaling_matrix8[3], 64, default_scaling8[1], fallback[3]); // Inter, Y
289  if (sps->chroma_format_idc == 3) {
290  decode_scaling_list(h, scaling_matrix8[4], 64, default_scaling8[1], scaling_matrix8[3]); // Inter, Cr
291  decode_scaling_list(h, scaling_matrix8[5], 64, default_scaling8[1], scaling_matrix8[4]); // Inter, Cb
292  }
293  }
294  }
295 }
296 
298 {
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 %u out of range\n", sps_id);
315  return AVERROR_INVALIDDATA;
316  }
317  sps = av_mallocz(sizeof(SPS));
318  if (!sps)
319  return AVERROR(ENOMEM);
320 
321  sps->sps_id = sps_id;
322  sps->time_offset_length = 24;
323  sps->profile_idc = profile_idc;
324  sps->constraint_set_flags = constraint_set_flags;
325  sps->level_idc = level_idc;
326 
327  memset(sps->scaling_matrix4, 16, sizeof(sps->scaling_matrix4));
328  memset(sps->scaling_matrix8, 16, sizeof(sps->scaling_matrix8));
329  sps->scaling_matrix_present = 0;
330 
331  if (sps->profile_idc == 100 || sps->profile_idc == 110 ||
332  sps->profile_idc == 122 || sps->profile_idc == 244 ||
333  sps->profile_idc == 44 || sps->profile_idc == 83 ||
334  sps->profile_idc == 86 || sps->profile_idc == 118 ||
335  sps->profile_idc == 128 || sps->profile_idc == 144) {
337  if (sps->chroma_format_idc > 3) {
338  avpriv_request_sample(h->avctx, "chroma_format_idc %u",
339  sps->chroma_format_idc);
340  goto fail;
341  } else if (sps->chroma_format_idc == 3) {
343  }
344  sps->bit_depth_luma = get_ue_golomb(&h->gb) + 8;
345  sps->bit_depth_chroma = get_ue_golomb(&h->gb) + 8;
346  if (sps->bit_depth_chroma != sps->bit_depth_luma) {
348  "Different chroma and luma bit depth");
349  goto fail;
350  }
351  sps->transform_bypass = get_bits1(&h->gb);
352  decode_scaling_matrices(h, sps, NULL, 1,
353  sps->scaling_matrix4, sps->scaling_matrix8);
354  } else {
355  sps->chroma_format_idc = 1;
356  sps->bit_depth_luma = 8;
357  sps->bit_depth_chroma = 8;
358  }
359 
360  log2_max_frame_num_minus4 = get_ue_golomb(&h->gb);
361  if (log2_max_frame_num_minus4 < MIN_LOG2_MAX_FRAME_NUM - 4 ||
362  log2_max_frame_num_minus4 > MAX_LOG2_MAX_FRAME_NUM - 4) {
364  "log2_max_frame_num_minus4 out of range (0-12): %d\n",
365  log2_max_frame_num_minus4);
366  goto fail;
367  }
368  sps->log2_max_frame_num = log2_max_frame_num_minus4 + 4;
369 
370  sps->poc_type = get_ue_golomb_31(&h->gb);
371 
372  if (sps->poc_type == 0) { // FIXME #define
373  sps->log2_max_poc_lsb = get_ue_golomb(&h->gb) + 4;
374  } else if (sps->poc_type == 1) { // FIXME #define
378  sps->poc_cycle_length = get_ue_golomb(&h->gb);
379 
380  if ((unsigned)sps->poc_cycle_length >=
383  "poc_cycle_length overflow %u\n", sps->poc_cycle_length);
384  goto fail;
385  }
386 
387  for (i = 0; i < sps->poc_cycle_length; i++)
388  sps->offset_for_ref_frame[i] = get_se_golomb(&h->gb);
389  } else if (sps->poc_type != 2) {
390  av_log(h->avctx, AV_LOG_ERROR, "illegal POC type %d\n", sps->poc_type);
391  goto fail;
392  }
393 
394  sps->ref_frame_count = get_ue_golomb_31(&h->gb);
395  if (sps->ref_frame_count > MAX_PICTURE_COUNT - 2 ||
396  sps->ref_frame_count >= 32U) {
398  "too many reference frames %d\n", sps->ref_frame_count);
399  goto fail;
400  }
402  sps->mb_width = get_ue_golomb(&h->gb) + 1;
403  sps->mb_height = get_ue_golomb(&h->gb) + 1;
404  if ((unsigned)sps->mb_width >= INT_MAX / 16 ||
405  (unsigned)sps->mb_height >= INT_MAX / 16 ||
406  av_image_check_size(16 * sps->mb_width,
407  16 * sps->mb_height, 0, h->avctx)) {
408  av_log(h->avctx, AV_LOG_ERROR, "mb_width/height overflow\n");
409  goto fail;
410  }
411 
412  sps->frame_mbs_only_flag = get_bits1(&h->gb);
413  if (!sps->frame_mbs_only_flag)
414  sps->mb_aff = get_bits1(&h->gb);
415  else
416  sps->mb_aff = 0;
417 
419  if (!sps->frame_mbs_only_flag && !sps->direct_8x8_inference_flag) {
421  "This stream was generated by a broken encoder, invalid 8x8 inference\n");
422  goto fail;
423  }
424 
425 #ifndef ALLOW_INTERLACE
426  if (sps->mb_aff)
428  "MBAFF support not included; enable it at compile-time.\n");
429 #endif
430  sps->crop = get_bits1(&h->gb);
431  if (sps->crop) {
432  int crop_left = get_ue_golomb(&h->gb);
433  int crop_right = get_ue_golomb(&h->gb);
434  int crop_top = get_ue_golomb(&h->gb);
435  int crop_bottom = get_ue_golomb(&h->gb);
436 
438  av_log(h->avctx, AV_LOG_DEBUG, "discarding sps cropping, original "
439  "values are l:%u r:%u t:%u b:%u\n",
440  crop_left, crop_right, crop_top, crop_bottom);
441 
442  sps->crop_left =
443  sps->crop_right =
444  sps->crop_top =
445  sps->crop_bottom = 0;
446  } else {
447  int vsub = (sps->chroma_format_idc == 1) ? 1 : 0;
448  int hsub = (sps->chroma_format_idc == 1 ||
449  sps->chroma_format_idc == 2) ? 1 : 0;
450  int step_x = 1 << hsub;
451  int step_y = (2 - sps->frame_mbs_only_flag) << vsub;
452 
453  if (crop_left & (0x1F >> (sps->bit_depth_luma > 8)) &&
454  !(h->avctx->flags & CODEC_FLAG_UNALIGNED)) {
455  crop_left &= ~(0x1F >> (sps->bit_depth_luma > 8));
457  "Reducing left cropping to %d "
458  "chroma samples to preserve alignment.\n",
459  crop_left);
460  }
461 
462  sps->crop_left = crop_left * step_x;
463  sps->crop_right = crop_right * step_x;
464  sps->crop_top = crop_top * step_y;
465  sps->crop_bottom = crop_bottom * step_y;
466  }
467  } else {
468  sps->crop_left =
469  sps->crop_right =
470  sps->crop_top =
471  sps->crop_bottom =
472  sps->crop = 0;
473  }
474 
476  if (sps->vui_parameters_present_flag) {
477  int ret = decode_vui_parameters(h, sps);
478  if (ret < 0 && h->avctx->err_recognition & AV_EF_EXPLODE)
479  goto fail;
480  }
481 
482  if (!sps->sar.den)
483  sps->sar.den = 1;
484 
485  if (h->avctx->debug & FF_DEBUG_PICT_INFO) {
486  static const char csp[4][5] = { "Gray", "420", "422", "444" };
488  "sps:%u profile:%d/%d poc:%d ref:%d %dx%d %s %s crop:%d/%d/%d/%d %s %s %d/%d\n",
489  sps_id, sps->profile_idc, sps->level_idc,
490  sps->poc_type,
491  sps->ref_frame_count,
492  sps->mb_width, sps->mb_height,
493  sps->frame_mbs_only_flag ? "FRM" : (sps->mb_aff ? "MB-AFF" : "PIC-AFF"),
494  sps->direct_8x8_inference_flag ? "8B8" : "",
495  sps->crop_left, sps->crop_right,
496  sps->crop_top, sps->crop_bottom,
497  sps->vui_parameters_present_flag ? "VUI" : "",
498  csp[sps->chroma_format_idc],
500  sps->timing_info_present_flag ? sps->time_scale : 0);
501  }
502  sps->new = 1;
503 
504  av_free(h->sps_buffers[sps_id]);
505  h->sps_buffers[sps_id] = sps;
506  h->sps = *sps;
507 
508  return 0;
509 
510 fail:
511  av_free(sps);
512  return -1;
513 }
514 
515 static void build_qp_table(PPS *pps, int t, int index, const int depth)
516 {
517  int i;
518  const int max_qp = 51 + 6 * (depth - 8);
519  for (i = 0; i < max_qp + 1; i++)
520  pps->chroma_qp_table[t][i] =
521  ff_h264_chroma_qp[depth - 8][av_clip(i + index, 0, max_qp)];
522 }
523 
525 {
526  unsigned int pps_id = get_ue_golomb(&h->gb);
527  PPS *pps;
528  const int qp_bd_offset = 6 * (h->sps.bit_depth_luma - 8);
529  int bits_left;
530 
531  if (pps_id >= MAX_PPS_COUNT) {
532  av_log(h->avctx, AV_LOG_ERROR, "pps_id %u out of range\n", pps_id);
533  return AVERROR_INVALIDDATA;
534  } else if (h->sps.bit_depth_luma > 10) {
536  "Unimplemented luma bit depth=%d (max=10)\n",
537  h->sps.bit_depth_luma);
538  return AVERROR_PATCHWELCOME;
539  }
540 
541  pps = av_mallocz(sizeof(PPS));
542  if (!pps)
543  return AVERROR(ENOMEM);
544  pps->sps_id = get_ue_golomb_31(&h->gb);
545  if ((unsigned)pps->sps_id >= MAX_SPS_COUNT ||
546  h->sps_buffers[pps->sps_id] == NULL) {
547  av_log(h->avctx, AV_LOG_ERROR, "sps_id %u out of range\n", pps->sps_id);
548  goto fail;
549  }
550 
551  pps->cabac = get_bits1(&h->gb);
552  pps->pic_order_present = get_bits1(&h->gb);
553  pps->slice_group_count = get_ue_golomb(&h->gb) + 1;
554  if (pps->slice_group_count > 1) {
556  av_log(h->avctx, AV_LOG_ERROR, "FMO not supported\n");
557  switch (pps->mb_slice_group_map_type) {
558  case 0:
559 #if 0
560  | for (i = 0; i <= num_slice_groups_minus1; i++) | | |
561  | run_length[i] |1 |ue(v) |
562 #endif
563  break;
564  case 2:
565 #if 0
566  | for (i = 0; i < num_slice_groups_minus1; i++) { | | |
567  | top_left_mb[i] |1 |ue(v) |
568  | bottom_right_mb[i] |1 |ue(v) |
569  | } | | |
570 #endif
571  break;
572  case 3:
573  case 4:
574  case 5:
575 #if 0
576  | slice_group_change_direction_flag |1 |u(1) |
577  | slice_group_change_rate_minus1 |1 |ue(v) |
578 #endif
579  break;
580  case 6:
581 #if 0
582  | slice_group_id_cnt_minus1 |1 |ue(v) |
583  | for (i = 0; i <= slice_group_id_cnt_minus1; i++)| | |
584  | slice_group_id[i] |1 |u(v) |
585 #endif
586  break;
587  }
588  }
589  pps->ref_count[0] = get_ue_golomb(&h->gb) + 1;
590  pps->ref_count[1] = get_ue_golomb(&h->gb) + 1;
591  if (pps->ref_count[0] - 1 > 32 - 1 || pps->ref_count[1] - 1 > 32 - 1) {
592  av_log(h->avctx, AV_LOG_ERROR, "reference overflow (pps)\n");
593  goto fail;
594  }
595 
596  pps->weighted_pred = get_bits1(&h->gb);
597  pps->weighted_bipred_idc = get_bits(&h->gb, 2);
598  pps->init_qp = get_se_golomb(&h->gb) + 26 + qp_bd_offset;
599  pps->init_qs = get_se_golomb(&h->gb) + 26 + qp_bd_offset;
600  pps->chroma_qp_index_offset[0] = get_se_golomb(&h->gb);
602  pps->constrained_intra_pred = get_bits1(&h->gb);
604 
605  pps->transform_8x8_mode = 0;
606  // contents of sps/pps can change even if id doesn't, so reinit
607  h->dequant_coeff_pps = -1;
608  memcpy(pps->scaling_matrix4, h->sps_buffers[pps->sps_id]->scaling_matrix4,
609  sizeof(pps->scaling_matrix4));
610  memcpy(pps->scaling_matrix8, h->sps_buffers[pps->sps_id]->scaling_matrix8,
611  sizeof(pps->scaling_matrix8));
612 
613  bits_left = bit_length - get_bits_count(&h->gb);
614  if (bits_left && (bits_left > 8 ||
615  show_bits(&h->gb, bits_left) != 1 << (bits_left - 1))) {
616  pps->transform_8x8_mode = get_bits1(&h->gb);
617  decode_scaling_matrices(h, h->sps_buffers[pps->sps_id], pps, 0,
618  pps->scaling_matrix4, pps->scaling_matrix8);
619  // second_chroma_qp_index_offset
620  pps->chroma_qp_index_offset[1] = get_se_golomb(&h->gb);
621  } else {
623  }
624 
625  build_qp_table(pps, 0, pps->chroma_qp_index_offset[0],
626  h->sps.bit_depth_luma);
627  build_qp_table(pps, 1, pps->chroma_qp_index_offset[1],
628  h->sps.bit_depth_luma);
629  if (pps->chroma_qp_index_offset[0] != pps->chroma_qp_index_offset[1])
630  pps->chroma_qp_diff = 1;
631 
632  if (h->avctx->debug & FF_DEBUG_PICT_INFO) {
634  "pps:%u sps:%u %s slice_groups:%d ref:%d/%d %s qp:%d/%d/%d/%d %s %s %s %s\n",
635  pps_id, pps->sps_id,
636  pps->cabac ? "CABAC" : "CAVLC",
637  pps->slice_group_count,
638  pps->ref_count[0], pps->ref_count[1],
639  pps->weighted_pred ? "weighted" : "",
640  pps->init_qp, pps->init_qs, pps->chroma_qp_index_offset[0], pps->chroma_qp_index_offset[1],
641  pps->deblocking_filter_parameters_present ? "LPAR" : "",
642  pps->constrained_intra_pred ? "CONSTR" : "",
643  pps->redundant_pic_cnt_present ? "REDU" : "",
644  pps->transform_8x8_mode ? "8x8DCT" : "");
645  }
646 
647  av_free(h->pps_buffers[pps_id]);
648  h->pps_buffers[pps_id] = pps;
649  return 0;
650 
651 fail:
652  av_free(pps);
653  return -1;
654 }