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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 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 <inttypes.h>
29 
30 #include "libavutil/imgutils.h"
31 #include "internal.h"
32 #include "avcodec.h"
33 #include "h264.h"
34 #include "h264data.h"
35 #include "golomb.h"
36 
37 #define MAX_LOG2_MAX_FRAME_NUM (12 + 4)
38 #define MIN_LOG2_MAX_FRAME_NUM 4
39 
40 #define QP(qP, depth) ((qP) + 6 * ((depth) - 8))
41 
42 #define CHROMA_QP_TABLE_END(d) \
43  QP(0, d), QP(1, d), QP(2, d), QP(3, d), QP(4, d), QP(5, d), \
44  QP(6, d), QP(7, d), QP(8, d), QP(9, d), QP(10, d), QP(11, d), \
45  QP(12, d), QP(13, d), QP(14, d), QP(15, d), QP(16, d), QP(17, d), \
46  QP(18, d), QP(19, d), QP(20, d), QP(21, d), QP(22, d), QP(23, d), \
47  QP(24, d), QP(25, d), QP(26, d), QP(27, d), QP(28, d), QP(29, d), \
48  QP(29, d), QP(30, d), QP(31, d), QP(32, d), QP(32, d), QP(33, d), \
49  QP(34, d), QP(34, d), QP(35, d), QP(35, d), QP(36, d), QP(36, d), \
50  QP(37, d), QP(37, d), QP(37, d), QP(38, d), QP(38, d), QP(38, d), \
51  QP(39, d), QP(39, d), QP(39, d), QP(39, d)
52 
53 const uint8_t ff_h264_chroma_qp[7][QP_MAX_NUM + 1] = {
54  { CHROMA_QP_TABLE_END(8) },
55  { 0, 1, 2, 3, 4, 5,
56  CHROMA_QP_TABLE_END(9) },
57  { 0, 1, 2, 3, 4, 5,
58  6, 7, 8, 9, 10, 11,
59  CHROMA_QP_TABLE_END(10) },
60  { 0, 1, 2, 3, 4, 5,
61  6, 7, 8, 9, 10, 11,
62  12,13,14,15, 16, 17,
63  CHROMA_QP_TABLE_END(11) },
64  { 0, 1, 2, 3, 4, 5,
65  6, 7, 8, 9, 10, 11,
66  12,13,14,15, 16, 17,
67  18,19,20,21, 22, 23,
68  CHROMA_QP_TABLE_END(12) },
69  { 0, 1, 2, 3, 4, 5,
70  6, 7, 8, 9, 10, 11,
71  12,13,14,15, 16, 17,
72  18,19,20,21, 22, 23,
73  24,25,26,27, 28, 29,
74  CHROMA_QP_TABLE_END(13) },
75  { 0, 1, 2, 3, 4, 5,
76  6, 7, 8, 9, 10, 11,
77  12,13,14,15, 16, 17,
78  18,19,20,21, 22, 23,
79  24,25,26,27, 28, 29,
80  30,31,32,33, 34, 35,
81  CHROMA_QP_TABLE_END(14) },
82 };
83 
84 static const uint8_t default_scaling4[2][16] = {
85  { 6, 13, 20, 28, 13, 20, 28, 32,
86  20, 28, 32, 37, 28, 32, 37, 42 },
87  { 10, 14, 20, 24, 14, 20, 24, 27,
88  20, 24, 27, 30, 24, 27, 30, 34 }
89 };
90 
91 static const uint8_t default_scaling8[2][64] = {
92  { 6, 10, 13, 16, 18, 23, 25, 27,
93  10, 11, 16, 18, 23, 25, 27, 29,
94  13, 16, 18, 23, 25, 27, 29, 31,
95  16, 18, 23, 25, 27, 29, 31, 33,
96  18, 23, 25, 27, 29, 31, 33, 36,
97  23, 25, 27, 29, 31, 33, 36, 38,
98  25, 27, 29, 31, 33, 36, 38, 40,
99  27, 29, 31, 33, 36, 38, 40, 42 },
100  { 9, 13, 15, 17, 19, 21, 22, 24,
101  13, 13, 17, 19, 21, 22, 24, 25,
102  15, 17, 19, 21, 22, 24, 25, 27,
103  17, 19, 21, 22, 24, 25, 27, 28,
104  19, 21, 22, 24, 25, 27, 28, 30,
105  21, 22, 24, 25, 27, 28, 30, 32,
106  22, 24, 25, 27, 28, 30, 32, 33,
107  24, 25, 27, 28, 30, 32, 33, 35 }
108 };
109 
110 static inline int decode_hrd_parameters(H264Context *h, SPS *sps)
111 {
112  int cpb_count, i;
113  cpb_count = get_ue_golomb_31(&h->gb) + 1;
114 
115  if (cpb_count > 32U) {
116  av_log(h->avctx, AV_LOG_ERROR, "cpb_count %d invalid\n", cpb_count);
117  return AVERROR_INVALIDDATA;
118  }
119 
120  get_bits(&h->gb, 4); /* bit_rate_scale */
121  get_bits(&h->gb, 4); /* cpb_size_scale */
122  for (i = 0; i < cpb_count; i++) {
123  get_ue_golomb_long(&h->gb); /* bit_rate_value_minus1 */
124  get_ue_golomb_long(&h->gb); /* cpb_size_value_minus1 */
125  get_bits1(&h->gb); /* cbr_flag */
126  }
127  sps->initial_cpb_removal_delay_length = get_bits(&h->gb, 5) + 1;
128  sps->cpb_removal_delay_length = get_bits(&h->gb, 5) + 1;
129  sps->dpb_output_delay_length = get_bits(&h->gb, 5) + 1;
130  sps->time_offset_length = get_bits(&h->gb, 5);
131  sps->cpb_cnt = cpb_count;
132  return 0;
133 }
134 
135 static inline int decode_vui_parameters(H264Context *h, SPS *sps)
136 {
137  int aspect_ratio_info_present_flag;
138  unsigned int aspect_ratio_idc;
139 
140  aspect_ratio_info_present_flag = get_bits1(&h->gb);
141 
142  if (aspect_ratio_info_present_flag) {
143  aspect_ratio_idc = get_bits(&h->gb, 8);
144  if (aspect_ratio_idc == EXTENDED_SAR) {
145  sps->sar.num = get_bits(&h->gb, 16);
146  sps->sar.den = get_bits(&h->gb, 16);
147  } else if (aspect_ratio_idc < FF_ARRAY_ELEMS(ff_h264_pixel_aspect)) {
148  sps->sar = ff_h264_pixel_aspect[aspect_ratio_idc];
149  } else {
150  av_log(h->avctx, AV_LOG_ERROR, "illegal aspect ratio\n");
151  return AVERROR_INVALIDDATA;
152  }
153  } else {
154  sps->sar.num =
155  sps->sar.den = 0;
156  }
157 
158  if (get_bits1(&h->gb)) /* overscan_info_present_flag */
159  get_bits1(&h->gb); /* overscan_appropriate_flag */
160 
161  sps->video_signal_type_present_flag = get_bits1(&h->gb);
162  if (sps->video_signal_type_present_flag) {
163  get_bits(&h->gb, 3); /* video_format */
164  sps->full_range = get_bits1(&h->gb); /* video_full_range_flag */
165 
166  sps->colour_description_present_flag = get_bits1(&h->gb);
167  if (sps->colour_description_present_flag) {
168  sps->color_primaries = get_bits(&h->gb, 8); /* colour_primaries */
169  sps->color_trc = get_bits(&h->gb, 8); /* transfer_characteristics */
170  sps->colorspace = get_bits(&h->gb, 8); /* matrix_coefficients */
171  if (sps->color_primaries >= AVCOL_PRI_NB)
172  sps->color_primaries = AVCOL_PRI_UNSPECIFIED;
173  if (sps->color_trc >= AVCOL_TRC_NB)
174  sps->color_trc = AVCOL_TRC_UNSPECIFIED;
175  if (sps->colorspace >= AVCOL_SPC_NB)
176  sps->colorspace = AVCOL_SPC_UNSPECIFIED;
177  }
178  }
179 
180  /* chroma_location_info_present_flag */
181  if (get_bits1(&h->gb)) {
182  /* chroma_sample_location_type_top_field */
183  h->avctx->chroma_sample_location = get_ue_golomb(&h->gb) + 1;
184  get_ue_golomb(&h->gb); /* chroma_sample_location_type_bottom_field */
185  }
186 
187  if (show_bits1(&h->gb) && get_bits_left(&h->gb) < 10) {
188  av_log(h->avctx, AV_LOG_WARNING, "Truncated VUI\n");
189  return 0;
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,
198  "time_scale/num_units_in_tick invalid or unsupported (%"PRIu32"/%"PRIu32")\n",
199  sps->time_scale, sps->num_units_in_tick);
200  return AVERROR_INVALIDDATA;
201  }
202  sps->fixed_frame_rate_flag = get_bits1(&h->gb);
203  }
204 
205  sps->nal_hrd_parameters_present_flag = get_bits1(&h->gb);
206  if (sps->nal_hrd_parameters_present_flag)
207  if (decode_hrd_parameters(h, sps) < 0)
208  return AVERROR_INVALIDDATA;
209  sps->vcl_hrd_parameters_present_flag = get_bits1(&h->gb);
210  if (sps->vcl_hrd_parameters_present_flag)
211  if (decode_hrd_parameters(h, sps) < 0)
212  return AVERROR_INVALIDDATA;
213  if (sps->nal_hrd_parameters_present_flag ||
214  sps->vcl_hrd_parameters_present_flag)
215  get_bits1(&h->gb); /* low_delay_hrd_flag */
216  sps->pic_struct_present_flag = get_bits1(&h->gb);
217  if (!get_bits_left(&h->gb))
218  return 0;
219  sps->bitstream_restriction_flag = get_bits1(&h->gb);
220  if (sps->bitstream_restriction_flag) {
221  get_bits1(&h->gb); /* motion_vectors_over_pic_boundaries_flag */
222  get_ue_golomb(&h->gb); /* max_bytes_per_pic_denom */
223  get_ue_golomb(&h->gb); /* max_bits_per_mb_denom */
224  get_ue_golomb(&h->gb); /* log2_max_mv_length_horizontal */
225  get_ue_golomb(&h->gb); /* log2_max_mv_length_vertical */
226  sps->num_reorder_frames = get_ue_golomb(&h->gb);
227  get_ue_golomb(&h->gb); /*max_dec_frame_buffering*/
228 
229  if (get_bits_left(&h->gb) < 0) {
230  sps->num_reorder_frames = 0;
231  sps->bitstream_restriction_flag = 0;
232  }
233 
234  if (sps->num_reorder_frames > 16U
235  /* max_dec_frame_buffering || max_dec_frame_buffering > 16 */) {
236  av_log(h->avctx, AV_LOG_ERROR,
237  "Clipping illegal num_reorder_frames %d\n",
238  sps->num_reorder_frames);
239  sps->num_reorder_frames = 16;
240  return AVERROR_INVALIDDATA;
241  }
242  }
243 
244  if (get_bits_left(&h->gb) < 0) {
245  av_log(h->avctx, AV_LOG_ERROR,
246  "Overread VUI by %d bits\n", -get_bits_left(&h->gb));
247  return AVERROR_INVALIDDATA;
248  }
249 
250  return 0;
251 }
252 
253 static void decode_scaling_list(H264Context *h, uint8_t *factors, int size,
254  const uint8_t *jvt_list,
255  const uint8_t *fallback_list)
256 {
257  int i, last = 8, next = 8;
258  const uint8_t *scan = size == 16 ? zigzag_scan : ff_zigzag_direct;
259  if (!get_bits1(&h->gb)) /* matrix not written, we use the predicted one */
260  memcpy(factors, fallback_list, size * sizeof(uint8_t));
261  else
262  for (i = 0; i < size; i++) {
263  if (next)
264  next = (last + get_se_golomb(&h->gb)) & 0xff;
265  if (!i && !next) { /* matrix not written, we use the preset one */
266  memcpy(factors, jvt_list, size * sizeof(uint8_t));
267  break;
268  }
269  last = factors[scan[i]] = next ? next : last;
270  }
271 }
272 
273 static void decode_scaling_matrices(H264Context *h, SPS *sps,
274  PPS *pps, int is_sps,
275  uint8_t(*scaling_matrix4)[16],
276  uint8_t(*scaling_matrix8)[64])
277 {
278  int fallback_sps = !is_sps && sps->scaling_matrix_present;
279  const uint8_t *fallback[4] = {
280  fallback_sps ? sps->scaling_matrix4[0] : default_scaling4[0],
281  fallback_sps ? sps->scaling_matrix4[3] : default_scaling4[1],
282  fallback_sps ? sps->scaling_matrix8[0] : default_scaling8[0],
283  fallback_sps ? sps->scaling_matrix8[3] : default_scaling8[1]
284  };
285  if (get_bits1(&h->gb)) {
286  sps->scaling_matrix_present |= is_sps;
287  decode_scaling_list(h, scaling_matrix4[0], 16, default_scaling4[0], fallback[0]); // Intra, Y
288  decode_scaling_list(h, scaling_matrix4[1], 16, default_scaling4[0], scaling_matrix4[0]); // Intra, Cr
289  decode_scaling_list(h, scaling_matrix4[2], 16, default_scaling4[0], scaling_matrix4[1]); // Intra, Cb
290  decode_scaling_list(h, scaling_matrix4[3], 16, default_scaling4[1], fallback[1]); // Inter, Y
291  decode_scaling_list(h, scaling_matrix4[4], 16, default_scaling4[1], scaling_matrix4[3]); // Inter, Cr
292  decode_scaling_list(h, scaling_matrix4[5], 16, default_scaling4[1], scaling_matrix4[4]); // Inter, Cb
293  if (is_sps || pps->transform_8x8_mode) {
294  decode_scaling_list(h, scaling_matrix8[0], 64, default_scaling8[0], fallback[2]); // Intra, Y
295  decode_scaling_list(h, scaling_matrix8[3], 64, default_scaling8[1], fallback[3]); // Inter, Y
296  if (sps->chroma_format_idc == 3) {
297  decode_scaling_list(h, scaling_matrix8[1], 64, default_scaling8[0], scaling_matrix8[0]); // Intra, Cr
298  decode_scaling_list(h, scaling_matrix8[4], 64, default_scaling8[1], scaling_matrix8[3]); // Inter, Cr
299  decode_scaling_list(h, scaling_matrix8[2], 64, default_scaling8[0], scaling_matrix8[1]); // Intra, Cb
300  decode_scaling_list(h, scaling_matrix8[5], 64, default_scaling8[1], scaling_matrix8[4]); // Inter, Cb
301  }
302  }
303  }
304 }
305 
306 int ff_h264_decode_seq_parameter_set(H264Context *h)
307 {
308  int profile_idc, level_idc, constraint_set_flags = 0;
309  unsigned int sps_id;
310  int i, log2_max_frame_num_minus4;
311  SPS *sps;
312 
313  profile_idc = get_bits(&h->gb, 8);
314  constraint_set_flags |= get_bits1(&h->gb) << 0; // constraint_set0_flag
315  constraint_set_flags |= get_bits1(&h->gb) << 1; // constraint_set1_flag
316  constraint_set_flags |= get_bits1(&h->gb) << 2; // constraint_set2_flag
317  constraint_set_flags |= get_bits1(&h->gb) << 3; // constraint_set3_flag
318  constraint_set_flags |= get_bits1(&h->gb) << 4; // constraint_set4_flag
319  constraint_set_flags |= get_bits1(&h->gb) << 5; // constraint_set5_flag
320  skip_bits(&h->gb, 2); // reserved_zero_2bits
321  level_idc = get_bits(&h->gb, 8);
322  sps_id = get_ue_golomb_31(&h->gb);
323 
324  if (sps_id >= MAX_SPS_COUNT) {
325  av_log(h->avctx, AV_LOG_ERROR, "sps_id %u out of range\n", sps_id);
326  return AVERROR_INVALIDDATA;
327  }
328  sps = av_mallocz(sizeof(SPS));
329  if (!sps)
330  return AVERROR(ENOMEM);
331 
332  sps->sps_id = sps_id;
333  sps->time_offset_length = 24;
334  sps->profile_idc = profile_idc;
335  sps->constraint_set_flags = constraint_set_flags;
336  sps->level_idc = level_idc;
337  sps->full_range = -1;
338 
339  memset(sps->scaling_matrix4, 16, sizeof(sps->scaling_matrix4));
340  memset(sps->scaling_matrix8, 16, sizeof(sps->scaling_matrix8));
341  sps->scaling_matrix_present = 0;
342  sps->colorspace = 2; //AVCOL_SPC_UNSPECIFIED
343 
344  if (sps->profile_idc == 100 || // High profile
345  sps->profile_idc == 110 || // High10 profile
346  sps->profile_idc == 122 || // High422 profile
347  sps->profile_idc == 244 || // High444 Predictive profile
348  sps->profile_idc == 44 || // Cavlc444 profile
349  sps->profile_idc == 83 || // Scalable Constrained High profile (SVC)
350  sps->profile_idc == 86 || // Scalable High Intra profile (SVC)
351  sps->profile_idc == 118 || // Stereo High profile (MVC)
352  sps->profile_idc == 128 || // Multiview High profile (MVC)
353  sps->profile_idc == 138 || // Multiview Depth High profile (MVCD)
354  sps->profile_idc == 144) { // old High444 profile
355  sps->chroma_format_idc = get_ue_golomb_31(&h->gb);
356  if (sps->chroma_format_idc > 3U) {
357  avpriv_request_sample(h->avctx, "chroma_format_idc %u",
358  sps->chroma_format_idc);
359  goto fail;
360  } else if (sps->chroma_format_idc == 3) {
361  sps->residual_color_transform_flag = get_bits1(&h->gb);
362  if (sps->residual_color_transform_flag) {
363  av_log(h->avctx, AV_LOG_ERROR, "separate color planes are not supported\n");
364  goto fail;
365  }
366  }
367  sps->bit_depth_luma = get_ue_golomb(&h->gb) + 8;
368  sps->bit_depth_chroma = get_ue_golomb(&h->gb) + 8;
369  if (sps->bit_depth_chroma != sps->bit_depth_luma) {
370  avpriv_request_sample(h->avctx,
371  "Different chroma and luma bit depth");
372  goto fail;
373  }
374  if (sps->bit_depth_luma < 8 || sps->bit_depth_luma > 14 ||
375  sps->bit_depth_chroma < 8 || sps->bit_depth_chroma > 14) {
376  av_log(h->avctx, AV_LOG_ERROR, "illegal bit depth value (%d, %d)\n",
377  sps->bit_depth_luma, sps->bit_depth_chroma);
378  goto fail;
379  }
380  sps->transform_bypass = get_bits1(&h->gb);
381  decode_scaling_matrices(h, sps, NULL, 1,
382  sps->scaling_matrix4, sps->scaling_matrix8);
383  } else {
384  sps->chroma_format_idc = 1;
385  sps->bit_depth_luma = 8;
386  sps->bit_depth_chroma = 8;
387  }
388 
389  log2_max_frame_num_minus4 = get_ue_golomb(&h->gb);
390  if (log2_max_frame_num_minus4 < MIN_LOG2_MAX_FRAME_NUM - 4 ||
391  log2_max_frame_num_minus4 > MAX_LOG2_MAX_FRAME_NUM - 4) {
392  av_log(h->avctx, AV_LOG_ERROR,
393  "log2_max_frame_num_minus4 out of range (0-12): %d\n",
394  log2_max_frame_num_minus4);
395  goto fail;
396  }
397  sps->log2_max_frame_num = log2_max_frame_num_minus4 + 4;
398 
399  sps->poc_type = get_ue_golomb_31(&h->gb);
400 
401  if (sps->poc_type == 0) { // FIXME #define
402  unsigned t = get_ue_golomb(&h->gb);
403  if (t>12) {
404  av_log(h->avctx, AV_LOG_ERROR, "log2_max_poc_lsb (%d) is out of range\n", t);
405  goto fail;
406  }
407  sps->log2_max_poc_lsb = t + 4;
408  } else if (sps->poc_type == 1) { // FIXME #define
409  sps->delta_pic_order_always_zero_flag = get_bits1(&h->gb);
410  sps->offset_for_non_ref_pic = get_se_golomb(&h->gb);
411  sps->offset_for_top_to_bottom_field = get_se_golomb(&h->gb);
412  sps->poc_cycle_length = get_ue_golomb(&h->gb);
413 
414  if ((unsigned)sps->poc_cycle_length >=
415  FF_ARRAY_ELEMS(sps->offset_for_ref_frame)) {
416  av_log(h->avctx, AV_LOG_ERROR,
417  "poc_cycle_length overflow %d\n", sps->poc_cycle_length);
418  goto fail;
419  }
420 
421  for (i = 0; i < sps->poc_cycle_length; i++)
422  sps->offset_for_ref_frame[i] = get_se_golomb(&h->gb);
423  } else if (sps->poc_type != 2) {
424  av_log(h->avctx, AV_LOG_ERROR, "illegal POC type %d\n", sps->poc_type);
425  goto fail;
426  }
427 
428  sps->ref_frame_count = get_ue_golomb_31(&h->gb);
429  if (h->avctx->codec_tag == MKTAG('S', 'M', 'V', '2'))
430  sps->ref_frame_count = FFMAX(2, sps->ref_frame_count);
431  if (sps->ref_frame_count > H264_MAX_PICTURE_COUNT - 2 ||
432  sps->ref_frame_count > 16U) {
433  av_log(h->avctx, AV_LOG_ERROR,
434  "too many reference frames %d\n", sps->ref_frame_count);
435  goto fail;
436  }
437  sps->gaps_in_frame_num_allowed_flag = get_bits1(&h->gb);
438  sps->mb_width = get_ue_golomb(&h->gb) + 1;
439  sps->mb_height = get_ue_golomb(&h->gb) + 1;
440  if ((unsigned)sps->mb_width >= INT_MAX / 16 ||
441  (unsigned)sps->mb_height >= INT_MAX / 16 ||
442  av_image_check_size(16 * sps->mb_width,
443  16 * sps->mb_height, 0, h->avctx)) {
444  av_log(h->avctx, AV_LOG_ERROR, "mb_width/height overflow\n");
445  goto fail;
446  }
447 
448  sps->frame_mbs_only_flag = get_bits1(&h->gb);
449  if (!sps->frame_mbs_only_flag)
450  sps->mb_aff = get_bits1(&h->gb);
451  else
452  sps->mb_aff = 0;
453 
454  sps->direct_8x8_inference_flag = get_bits1(&h->gb);
455 
456 #ifndef ALLOW_INTERLACE
457  if (sps->mb_aff)
458  av_log(h->avctx, AV_LOG_ERROR,
459  "MBAFF support not included; enable it at compile-time.\n");
460 #endif
461  sps->crop = get_bits1(&h->gb);
462  if (sps->crop) {
463  int crop_left = get_ue_golomb(&h->gb);
464  int crop_right = get_ue_golomb(&h->gb);
465  int crop_top = get_ue_golomb(&h->gb);
466  int crop_bottom = get_ue_golomb(&h->gb);
467  int width = 16 * sps->mb_width;
468  int height = 16 * sps->mb_height * (2 - sps->frame_mbs_only_flag);
469 
470  if (h->avctx->flags2 & CODEC_FLAG2_IGNORE_CROP) {
471  av_log(h->avctx, AV_LOG_DEBUG, "discarding sps cropping, original "
472  "values are l:%d r:%d t:%d b:%d\n",
473  crop_left, crop_right, crop_top, crop_bottom);
474 
475  sps->crop_left =
476  sps->crop_right =
477  sps->crop_top =
478  sps->crop_bottom = 0;
479  } else {
480  int vsub = (sps->chroma_format_idc == 1) ? 1 : 0;
481  int hsub = (sps->chroma_format_idc == 1 ||
482  sps->chroma_format_idc == 2) ? 1 : 0;
483  int step_x = 1 << hsub;
484  int step_y = (2 - sps->frame_mbs_only_flag) << vsub;
485 
486  if (crop_left & (0x1F >> (sps->bit_depth_luma > 8)) &&
487  !(h->avctx->flags & CODEC_FLAG_UNALIGNED)) {
488  crop_left &= ~(0x1F >> (sps->bit_depth_luma > 8));
489  av_log(h->avctx, AV_LOG_WARNING,
490  "Reducing left cropping to %d "
491  "chroma samples to preserve alignment.\n",
492  crop_left);
493  }
494 
495  if (crop_left > (unsigned)INT_MAX / 4 / step_x ||
496  crop_right > (unsigned)INT_MAX / 4 / step_x ||
497  crop_top > (unsigned)INT_MAX / 4 / step_y ||
498  crop_bottom> (unsigned)INT_MAX / 4 / step_y ||
499  (crop_left + crop_right ) * step_x >= width ||
500  (crop_top + crop_bottom) * step_y >= height
501  ) {
502  av_log(h->avctx, AV_LOG_ERROR, "crop values invalid %d %d %d %d / %d %d\n", crop_left, crop_right, crop_top, crop_bottom, width, height);
503  goto fail;
504  }
505 
506  sps->crop_left = crop_left * step_x;
507  sps->crop_right = crop_right * step_x;
508  sps->crop_top = crop_top * step_y;
509  sps->crop_bottom = crop_bottom * step_y;
510  }
511  } else {
512  sps->crop_left =
513  sps->crop_right =
514  sps->crop_top =
515  sps->crop_bottom =
516  sps->crop = 0;
517  }
518 
519  sps->vui_parameters_present_flag = get_bits1(&h->gb);
520  if (sps->vui_parameters_present_flag) {
521  int ret = decode_vui_parameters(h, sps);
522  if (ret < 0)
523  goto fail;
524  }
525 
526  if (!sps->sar.den)
527  sps->sar.den = 1;
528 
529  if (h->avctx->debug & FF_DEBUG_PICT_INFO) {
530  static const char csp[4][5] = { "Gray", "420", "422", "444" };
531  av_log(h->avctx, AV_LOG_DEBUG,
532  "sps:%u profile:%d/%d poc:%d ref:%d %dx%d %s %s crop:%u/%u/%u/%u %s %s %"PRId32"/%"PRId32" b%d reo:%d\n",
533  sps_id, sps->profile_idc, sps->level_idc,
534  sps->poc_type,
535  sps->ref_frame_count,
536  sps->mb_width, sps->mb_height,
537  sps->frame_mbs_only_flag ? "FRM" : (sps->mb_aff ? "MB-AFF" : "PIC-AFF"),
538  sps->direct_8x8_inference_flag ? "8B8" : "",
539  sps->crop_left, sps->crop_right,
540  sps->crop_top, sps->crop_bottom,
541  sps->vui_parameters_present_flag ? "VUI" : "",
542  csp[sps->chroma_format_idc],
543  sps->timing_info_present_flag ? sps->num_units_in_tick : 0,
544  sps->timing_info_present_flag ? sps->time_scale : 0,
545  sps->bit_depth_luma,
546  sps->bitstream_restriction_flag ? sps->num_reorder_frames : -1
547  );
548  }
549  sps->new = 1;
550 
551  av_free(h->sps_buffers[sps_id]);
552  h->sps_buffers[sps_id] = sps;
553 
554  return 0;
555 
556 fail:
557  av_free(sps);
558  return -1;
559 }
560 
561 static void build_qp_table(PPS *pps, int t, int index, const int depth)
562 {
563  int i;
564  const int max_qp = 51 + 6 * (depth - 8);
565  for (i = 0; i < max_qp + 1; i++)
566  pps->chroma_qp_table[t][i] =
567  ff_h264_chroma_qp[depth - 8][av_clip(i + index, 0, max_qp)];
568 }
569 
570 static int more_rbsp_data_in_pps(H264Context *h, PPS *pps)
571 {
572  const SPS *sps = h->sps_buffers[pps->sps_id];
573  int profile_idc = sps->profile_idc;
574 
575  if ((profile_idc == 66 || profile_idc == 77 ||
576  profile_idc == 88) && (sps->constraint_set_flags & 7)) {
577  av_log(h->avctx, AV_LOG_VERBOSE,
578  "Current profile doesn't provide more RBSP data in PPS, skipping\n");
579  return 0;
580  }
581 
582  return 1;
583 }
584 
585 int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length)
586 {
587  unsigned int pps_id = get_ue_golomb(&h->gb);
588  PPS *pps;
589  SPS *sps;
590  int qp_bd_offset;
591  int bits_left;
592 
593  if (pps_id >= MAX_PPS_COUNT) {
594  av_log(h->avctx, AV_LOG_ERROR, "pps_id %u out of range\n", pps_id);
595  return AVERROR_INVALIDDATA;
596  }
597 
598  pps = av_mallocz(sizeof(PPS));
599  if (!pps)
600  return AVERROR(ENOMEM);
601  pps->sps_id = get_ue_golomb_31(&h->gb);
602  if ((unsigned)pps->sps_id >= MAX_SPS_COUNT ||
603  !h->sps_buffers[pps->sps_id]) {
604  av_log(h->avctx, AV_LOG_ERROR, "sps_id %u out of range\n", pps->sps_id);
605  goto fail;
606  }
607  sps = h->sps_buffers[pps->sps_id];
608  qp_bd_offset = 6 * (sps->bit_depth_luma - 8);
609  if (sps->bit_depth_luma > 14) {
610  av_log(h->avctx, AV_LOG_ERROR,
611  "Invalid luma bit depth=%d\n",
612  sps->bit_depth_luma);
613  goto fail;
614  } else if (sps->bit_depth_luma == 11 || sps->bit_depth_luma == 13) {
615  av_log(h->avctx, AV_LOG_ERROR,
616  "Unimplemented luma bit depth=%d\n",
617  sps->bit_depth_luma);
618  goto fail;
619  }
620 
621  pps->cabac = get_bits1(&h->gb);
622  pps->pic_order_present = get_bits1(&h->gb);
623  pps->slice_group_count = get_ue_golomb(&h->gb) + 1;
624  if (pps->slice_group_count > 1) {
625  pps->mb_slice_group_map_type = get_ue_golomb(&h->gb);
626  av_log(h->avctx, AV_LOG_ERROR, "FMO not supported\n");
627  switch (pps->mb_slice_group_map_type) {
628  case 0:
629 #if 0
630  | for (i = 0; i <= num_slice_groups_minus1; i++) | | |
631  | run_length[i] |1 |ue(v) |
632 #endif
633  break;
634  case 2:
635 #if 0
636  | for (i = 0; i < num_slice_groups_minus1; i++) { | | |
637  | top_left_mb[i] |1 |ue(v) |
638  | bottom_right_mb[i] |1 |ue(v) |
639  | } | | |
640 #endif
641  break;
642  case 3:
643  case 4:
644  case 5:
645 #if 0
646  | slice_group_change_direction_flag |1 |u(1) |
647  | slice_group_change_rate_minus1 |1 |ue(v) |
648 #endif
649  break;
650  case 6:
651 #if 0
652  | slice_group_id_cnt_minus1 |1 |ue(v) |
653  | for (i = 0; i <= slice_group_id_cnt_minus1; i++)| | |
654  | slice_group_id[i] |1 |u(v) |
655 #endif
656  break;
657  }
658  }
659  pps->ref_count[0] = get_ue_golomb(&h->gb) + 1;
660  pps->ref_count[1] = get_ue_golomb(&h->gb) + 1;
661  if (pps->ref_count[0] - 1 > 32 - 1 || pps->ref_count[1] - 1 > 32 - 1) {
662  av_log(h->avctx, AV_LOG_ERROR, "reference overflow (pps)\n");
663  goto fail;
664  }
665 
666  pps->weighted_pred = get_bits1(&h->gb);
667  pps->weighted_bipred_idc = get_bits(&h->gb, 2);
668  pps->init_qp = get_se_golomb(&h->gb) + 26 + qp_bd_offset;
669  pps->init_qs = get_se_golomb(&h->gb) + 26 + qp_bd_offset;
670  pps->chroma_qp_index_offset[0] = get_se_golomb(&h->gb);
671  pps->deblocking_filter_parameters_present = get_bits1(&h->gb);
672  pps->constrained_intra_pred = get_bits1(&h->gb);
673  pps->redundant_pic_cnt_present = get_bits1(&h->gb);
674 
675  pps->transform_8x8_mode = 0;
676  // contents of sps/pps can change even if id doesn't, so reinit
677  h->dequant_coeff_pps = -1;
678  memcpy(pps->scaling_matrix4, h->sps_buffers[pps->sps_id]->scaling_matrix4,
679  sizeof(pps->scaling_matrix4));
680  memcpy(pps->scaling_matrix8, h->sps_buffers[pps->sps_id]->scaling_matrix8,
681  sizeof(pps->scaling_matrix8));
682 
683  bits_left = bit_length - get_bits_count(&h->gb);
684  if (bits_left > 0 && more_rbsp_data_in_pps(h, pps)) {
685  pps->transform_8x8_mode = get_bits1(&h->gb);
686  decode_scaling_matrices(h, h->sps_buffers[pps->sps_id], pps, 0,
687  pps->scaling_matrix4, pps->scaling_matrix8);
688  // second_chroma_qp_index_offset
689  pps->chroma_qp_index_offset[1] = get_se_golomb(&h->gb);
690  } else {
691  pps->chroma_qp_index_offset[1] = pps->chroma_qp_index_offset[0];
692  }
693 
694  build_qp_table(pps, 0, pps->chroma_qp_index_offset[0], sps->bit_depth_luma);
695  build_qp_table(pps, 1, pps->chroma_qp_index_offset[1], sps->bit_depth_luma);
696  if (pps->chroma_qp_index_offset[0] != pps->chroma_qp_index_offset[1])
697  pps->chroma_qp_diff = 1;
698 
699  if (h->avctx->debug & FF_DEBUG_PICT_INFO) {
700  av_log(h->avctx, AV_LOG_DEBUG,
701  "pps:%u sps:%u %s slice_groups:%d ref:%u/%u %s qp:%d/%d/%d/%d %s %s %s %s\n",
702  pps_id, pps->sps_id,
703  pps->cabac ? "CABAC" : "CAVLC",
704  pps->slice_group_count,
705  pps->ref_count[0], pps->ref_count[1],
706  pps->weighted_pred ? "weighted" : "",
707  pps->init_qp, pps->init_qs, pps->chroma_qp_index_offset[0], pps->chroma_qp_index_offset[1],
708  pps->deblocking_filter_parameters_present ? "LPAR" : "",
709  pps->constrained_intra_pred ? "CONSTR" : "",
710  pps->redundant_pic_cnt_present ? "REDU" : "",
711  pps->transform_8x8_mode ? "8x8DCT" : "");
712  }
713 
714  av_free(h->pps_buffers[pps_id]);
715  h->pps_buffers[pps_id] = pps;
716  return 0;
717 
718 fail:
719  av_free(pps);
720  return -1;
721 }
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