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aarch64: Add assembly support for -fsanitize=hwaddress tagged globals.
[libav.git] / libavcodec / cbs_h264_syntax_template.c
blob1aa7888584eb3807b70d5662ca432f2d3f397ce0
1 /*
2 * This file is part of Libav.
3 *
4 * Libav is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * Libav is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with Libav; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 static int FUNC(rbsp_trailing_bits)(CodedBitstreamContext *ctx, RWContext *rw)
20 {
21 int err;
22 av_unused int one = 1, zero = 0;
23 xu(1, rbsp_stop_one_bit, one, 1, 1);
24 while (byte_alignment(rw) != 0)
25 xu(1, rbsp_alignment_zero_bit, zero, 0, 0);
26
27 return 0;
28 }
29
30 static int FUNC(nal_unit_header)(CodedBitstreamContext *ctx, RWContext *rw,
31 H264RawNALUnitHeader *current,
32 uint32_t valid_type_mask)
33 {
34 int err;
35
36 u(1, forbidden_zero_bit, 0, 0);
37 u(2, nal_ref_idc, 0, 3);
38 u(5, nal_unit_type, 0, 31);
39
40 if (!(1 << current->nal_unit_type & valid_type_mask)) {
41 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid NAL unit type %d.\n",
42 current->nal_unit_type);
43 return AVERROR_INVALIDDATA;
44 }
45
46 if (current->nal_unit_type == 14 ||
47 current->nal_unit_type == 20 ||
48 current->nal_unit_type == 21) {
49 if (current->nal_unit_type != 21)
50 flag(svc_extension_flag);
51 else
52 flag(avc_3d_extension_flag);
53
54 if (current->svc_extension_flag) {
55 av_log(ctx->log_ctx, AV_LOG_ERROR, "SVC not supported.\n");
56 return AVERROR_PATCHWELCOME;
57
58 } else if (current->avc_3d_extension_flag) {
59 av_log(ctx->log_ctx, AV_LOG_ERROR, "3DAVC not supported.\n");
60 return AVERROR_PATCHWELCOME;
61
62 } else {
63 av_log(ctx->log_ctx, AV_LOG_ERROR, "MVC not supported.\n");
64 return AVERROR_PATCHWELCOME;
65 }
66 }
67
68 return 0;
69 }
70
71 static int FUNC(scaling_list)(CodedBitstreamContext *ctx, RWContext *rw,
72 H264RawScalingList *current,
73 int size_of_scaling_list)
74 {
75 int err, i, scale;
76
77 scale = 8;
78 for (i = 0; i < size_of_scaling_list; i++) {
79 xse(delta_scale, current->delta_scale[i], -128, +127);
80 scale = (scale + current->delta_scale[i] + 256) % 256;
81 if (scale == 0)
82 break;
83 }
84
85 return 0;
86 }
87
88 static int FUNC(hrd_parameters)(CodedBitstreamContext *ctx, RWContext *rw,
89 H264RawHRD *current)
90 {
91 int err, i;
92
93 ue(cpb_cnt_minus1, 0, 31);
94 u(4, bit_rate_scale, 0, 15);
95 u(4, cpb_size_scale, 0, 15);
96
97 for (i = 0; i <= current->cpb_cnt_minus1; i++) {
98 ue(bit_rate_value_minus1[i], 0, UINT32_MAX - 1);
99 ue(cpb_size_value_minus1[i], 0, UINT32_MAX - 1);
100 flag(cbr_flag[i]);
101 }
102
103 u(5, initial_cpb_removal_delay_length_minus1, 0, 31);
104 u(5, cpb_removal_delay_length_minus1, 0, 31);
105 u(5, dpb_output_delay_length_minus1, 0, 31);
106 u(5, time_offset_length, 0, 31);
107
108 return 0;
109 }
110
111 static int FUNC(vui_parameters)(CodedBitstreamContext *ctx, RWContext *rw,
112 H264RawVUI *current, H264RawSPS *sps)
113 {
114 int err;
115
116 flag(aspect_ratio_info_present_flag);
117 if (current->aspect_ratio_info_present_flag) {
118 u(8, aspect_ratio_idc, 0, 255);
119 if (current->aspect_ratio_idc == 255) {
120 u(16, sar_width, 0, 65535);
121 u(16, sar_height, 0, 65535);
122 }
123 } else {
124 infer(aspect_ratio_idc, 0);
125 }
126
127 flag(overscan_info_present_flag);
128 if (current->overscan_info_present_flag)
129 flag(overscan_appropriate_flag);
130
131 flag(video_signal_type_present_flag);
132 if (current->video_signal_type_present_flag) {
133 u(3, video_format, 0, 7);
134 flag(video_full_range_flag);
135 flag(colour_description_present_flag);
136 if (current->colour_description_present_flag) {
137 u(8, colour_primaries, 0, 255);
138 u(8, transfer_characteristics, 0, 255);
139 u(8, matrix_coefficients, 0, 255);
140 }
141 } else {
142 infer(video_format, 5);
143 infer(video_full_range_flag, 0);
144 infer(colour_primaries, 2);
145 infer(transfer_characteristics, 2);
146 infer(matrix_coefficients, 2);
147 }
148
149 flag(chroma_loc_info_present_flag);
150 if (current->chroma_loc_info_present_flag) {
151 ue(chroma_sample_loc_type_top_field, 0, 5);
152 ue(chroma_sample_loc_type_bottom_field, 0, 5);
153 } else {
154 infer(chroma_sample_loc_type_top_field, 0);
155 infer(chroma_sample_loc_type_bottom_field, 0);
156 }
157
158 flag(timing_info_present_flag);
159 if (current->timing_info_present_flag) {
160 u(32, num_units_in_tick, 1, UINT32_MAX);
161 u(32, time_scale, 1, UINT32_MAX);
162 flag(fixed_frame_rate_flag);
163 } else {
164 infer(fixed_frame_rate_flag, 0);
165 }
166
167 flag(nal_hrd_parameters_present_flag);
168 if (current->nal_hrd_parameters_present_flag)
169 CHECK(FUNC(hrd_parameters)(ctx, rw, &current->nal_hrd_parameters));
170
171 flag(vcl_hrd_parameters_present_flag);
172 if (current->vcl_hrd_parameters_present_flag)
173 CHECK(FUNC(hrd_parameters)(ctx, rw, &current->vcl_hrd_parameters));
174
175 if (current->nal_hrd_parameters_present_flag ||
176 current->vcl_hrd_parameters_present_flag)
177 flag(low_delay_hrd_flag);
178 else
179 infer(low_delay_hrd_flag, 1 - current->fixed_frame_rate_flag);
180
181 flag(pic_struct_present_flag);
182
183 flag(bitstream_restriction_flag);
184 if (current->bitstream_restriction_flag) {
185 flag(motion_vectors_over_pic_boundaries_flag);
186 ue(max_bytes_per_pic_denom, 0, 16);
187 ue(max_bits_per_mb_denom, 0, 16);
188 ue(log2_max_mv_length_horizontal, 0, 16);
189 ue(log2_max_mv_length_vertical, 0, 16);
190 ue(max_num_reorder_frames, 0, H264_MAX_DPB_FRAMES);
191 ue(max_dec_frame_buffering, 0, H264_MAX_DPB_FRAMES);
192 } else {
193 infer(motion_vectors_over_pic_boundaries_flag, 1);
194 infer(max_bytes_per_pic_denom, 2);
195 infer(max_bits_per_mb_denom, 1);
196 infer(log2_max_mv_length_horizontal, 16);
197 infer(log2_max_mv_length_vertical, 16);
198
199 if ((sps->profile_idc == 44 || sps->profile_idc == 86 ||
200 sps->profile_idc == 110 || sps->profile_idc == 110 ||
201 sps->profile_idc == 122 || sps->profile_idc == 244) &&
202 sps->constraint_set3_flag) {
203 infer(max_num_reorder_frames, 0);
204 infer(max_dec_frame_buffering, 0);
205 } else {
206 infer(max_num_reorder_frames, H264_MAX_DPB_FRAMES);
207 infer(max_dec_frame_buffering, H264_MAX_DPB_FRAMES);
208 }
209 }
210
211 return 0;
212 }
213
214 static int FUNC(sps)(CodedBitstreamContext *ctx, RWContext *rw,
215 H264RawSPS *current)
216 {
217 int err, i;
218
219 HEADER("Sequence Parameter Set");
220
221 CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header,
222 1 << H264_NAL_SPS));
223
224 u(8, profile_idc, 0, 255);
225
226 flag(constraint_set0_flag);
227 flag(constraint_set1_flag);
228 flag(constraint_set2_flag);
229 flag(constraint_set3_flag);
230 flag(constraint_set4_flag);
231 flag(constraint_set5_flag);
232
233 u(2, reserved_zero_2bits, 0, 0);
234
235 u(8, level_idc, 0, 255);
236
237 ue(seq_parameter_set_id, 0, 31);
238
239 if (current->profile_idc == 100 || current->profile_idc == 110 ||
240 current->profile_idc == 122 || current->profile_idc == 244 ||
241 current->profile_idc == 44 || current->profile_idc == 83 ||
242 current->profile_idc == 86 || current->profile_idc == 118 ||
243 current->profile_idc == 128 || current->profile_idc == 138) {
244 ue(chroma_format_idc, 0, 3);
245
246 if (current->chroma_format_idc == 3)
247 flag(separate_colour_plane_flag);
248 else
249 infer(separate_colour_plane_flag, 0);
250
251 ue(bit_depth_luma_minus8, 0, 6);
252 ue(bit_depth_chroma_minus8, 0, 6);
253
254 flag(qpprime_y_zero_transform_bypass_flag);
255
256 flag(seq_scaling_matrix_present_flag);
257 if (current->seq_scaling_matrix_present_flag) {
258 for (i = 0; i < ((current->chroma_format_idc != 3) ? 8 : 12); i++) {
259 flag(seq_scaling_list_present_flag[i]);
260 if (current->seq_scaling_list_present_flag[i]) {
261 if (i < 6)
262 CHECK(FUNC(scaling_list)(ctx, rw,
263 &current->scaling_list_4x4[i],
264 16));
265 else
266 CHECK(FUNC(scaling_list)(ctx, rw,
267 &current->scaling_list_8x8[i - 6],
268 64));
269 }
270 }
271 }
272 } else {
273 infer(chroma_format_idc, current->profile_idc == 183 ? 0 : 1);
274
275 infer(separate_colour_plane_flag, 0);
276 infer(bit_depth_luma_minus8, 0);
277 infer(bit_depth_chroma_minus8, 0);
278 }
279
280 ue(log2_max_frame_num_minus4, 0, 12);
281 ue(pic_order_cnt_type, 0, 2);
282
283 if (current->pic_order_cnt_type == 0) {
284 ue(log2_max_pic_order_cnt_lsb_minus4, 0, 12);
285 } else if (current->pic_order_cnt_type == 1) {
286 flag(delta_pic_order_always_zero_flag);
287 se(offset_for_non_ref_pic, INT32_MIN + 1, INT32_MAX);
288 se(offset_for_top_to_bottom_field, INT32_MIN + 1, INT32_MAX);
289 ue(num_ref_frames_in_pic_order_cnt_cycle, 0, 255);
290
291 for (i = 0; i < current->num_ref_frames_in_pic_order_cnt_cycle; i++)
292 se(offset_for_ref_frame[i], INT32_MIN + 1, INT32_MAX);
293 }
294
295 ue(max_num_ref_frames, 0, H264_MAX_DPB_FRAMES);
296 flag(gaps_in_frame_num_allowed_flag);
297
298 ue(pic_width_in_mbs_minus1, 0, H264_MAX_MB_WIDTH);
299 ue(pic_height_in_map_units_minus1, 0, H264_MAX_MB_HEIGHT);
300
301 flag(frame_mbs_only_flag);
302 if (!current->frame_mbs_only_flag)
303 flag(mb_adaptive_frame_field_flag);
304
305 flag(direct_8x8_inference_flag);
306
307 flag(frame_cropping_flag);
308 if (current->frame_cropping_flag) {
309 ue(frame_crop_left_offset, 0, H264_MAX_WIDTH);
310 ue(frame_crop_right_offset, 0, H264_MAX_WIDTH);
311 ue(frame_crop_top_offset, 0, H264_MAX_HEIGHT);
312 ue(frame_crop_bottom_offset, 0, H264_MAX_HEIGHT);
313 }
314
315 flag(vui_parameters_present_flag);
316 if (current->vui_parameters_present_flag)
317 CHECK(FUNC(vui_parameters)(ctx, rw, &current->vui, current));
318
319 CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
320
321 return 0;
322 }
323
324 static int FUNC(sps_extension)(CodedBitstreamContext *ctx, RWContext *rw,
325 H264RawSPSExtension *current)
326 {
327 int err;
328
329 HEADER("Sequence Parameter Set Extension");
330
331 CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header,
332 1 << H264_NAL_SPS_EXT));
333
334 ue(seq_parameter_set_id, 0, 31);
335
336 ue(aux_format_idc, 0, 3);
337
338 if (current->aux_format_idc != 0) {
339 int bits;
340
341 ue(bit_depth_aux_minus8, 0, 4);
342 flag(alpha_incr_flag);
343
344 bits = current->bit_depth_aux_minus8 + 9;
345 u(bits, alpha_opaque_value, 0, (1 << bits) - 1);
346 u(bits, alpha_transparent_value, 0, (1 << bits) - 1);
347 }
348
349 flag(additional_extension_flag);
350
351 CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
352
353 return 0;
354 }
355
356 static int FUNC(pps)(CodedBitstreamContext *ctx, RWContext *rw,
357 H264RawPPS *current)
358 {
359 CodedBitstreamH264Context *h264 = ctx->priv_data;
360 const H264RawSPS *sps;
361 int err, i;
362
363 HEADER("Picture Parameter Set");
364
365 CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header,
366 1 << H264_NAL_PPS));
367
368 ue(pic_parameter_set_id, 0, 255);
369 ue(seq_parameter_set_id, 0, 31);
370
371 sps = h264->sps[current->seq_parameter_set_id];
372 if (!sps) {
373 av_log(ctx->log_ctx, AV_LOG_ERROR, "SPS id %d not available.\n",
374 current->seq_parameter_set_id);
375 return AVERROR_INVALIDDATA;
376 }
377
378 flag(entropy_coding_mode_flag);
379 flag(bottom_field_pic_order_in_frame_present_flag);
380
381 ue(num_slice_groups_minus1, 0, 7);
382 if (current->num_slice_groups_minus1 > 0) {
383 unsigned int pic_size;
384 int iGroup;
385
386 pic_size = (sps->pic_width_in_mbs_minus1 + 1) *
387 (sps->pic_height_in_map_units_minus1 + 1);
388
389 ue(slice_group_map_type, 0, 6);
390
391 if (current->slice_group_map_type == 0) {
392 for (iGroup = 0; iGroup <= current->num_slice_groups_minus1; iGroup++)
393 ue(run_length_minus1[iGroup], 0, pic_size - 1);
394
395 } else if (current->slice_group_map_type == 2) {
396 for (iGroup = 0; iGroup < current->num_slice_groups_minus1; iGroup++) {
397 ue(top_left[iGroup], 0, pic_size - 1);
398 ue(bottom_right[iGroup], current->top_left[iGroup], pic_size - 1);
399 }
400 } else if (current->slice_group_map_type == 3 ||
401 current->slice_group_map_type == 4 ||
402 current->slice_group_map_type == 5) {
403 flag(slice_group_change_direction_flag);
404 ue(slice_group_change_rate_minus1, 0, pic_size - 1);
405 } else if (current->slice_group_map_type == 6) {
406 ue(pic_size_in_map_units_minus1, pic_size - 1, pic_size - 1);
407
408 allocate(current->slice_group_id,
409 current->pic_size_in_map_units_minus1 + 1);
410 for (i = 0; i <= current->pic_size_in_map_units_minus1; i++)
411 u(av_log2(2 * current->num_slice_groups_minus1 + 1),
412 slice_group_id[i], 0, current->num_slice_groups_minus1);
413 }
414 }
415
416 ue(num_ref_idx_l0_default_active_minus1, 0, 31);
417 ue(num_ref_idx_l1_default_active_minus1, 0, 31);
418
419 flag(weighted_pred_flag);
420 u(2, weighted_bipred_idc, 0, 2);
421
422 se(pic_init_qp_minus26, -26 - 6 * sps->bit_depth_luma_minus8, +25);
423 se(pic_init_qs_minus26, -26, +25);
424 se(chroma_qp_index_offset, -12, +12);
425
426 flag(deblocking_filter_control_present_flag);
427 flag(constrained_intra_pred_flag);
428 flag(redundant_pic_cnt_present_flag);
429
430 if (more_rbsp_data(current->more_rbsp_data))
431 {
432 flag(transform_8x8_mode_flag);
433
434 flag(pic_scaling_matrix_present_flag);
435 if (current->pic_scaling_matrix_present_flag) {
436 for (i = 0; i < 6 + (((sps->chroma_format_idc != 3) ? 2 : 6) *
437 current->transform_8x8_mode_flag); i++) {
438 flag(pic_scaling_list_present_flag[i]);
439 if (current->pic_scaling_list_present_flag[i]) {
440 if (i < 6)
441 CHECK(FUNC(scaling_list)(ctx, rw,
442 &current->scaling_list_4x4[i],
443 16));
444 else
445 CHECK(FUNC(scaling_list)(ctx, rw,
446 &current->scaling_list_8x8[i - 6],
447 64));
448 }
449 }
450 }
451
452 se(second_chroma_qp_index_offset, -12, +12);
453 } else {
454 infer(transform_8x8_mode_flag, 0);
455 infer(pic_scaling_matrix_present_flag, 0);
456 infer(second_chroma_qp_index_offset, current->chroma_qp_index_offset);
457 }
458
459 CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
460
461 return 0;
462 }
463
464 static int FUNC(sei_buffering_period)(CodedBitstreamContext *ctx, RWContext *rw,
465 H264RawSEIBufferingPeriod *current)
466 {
467 CodedBitstreamH264Context *h264 = ctx->priv_data;
468 const H264RawSPS *sps;
469 int err, i, length;
470
471 ue(seq_parameter_set_id, 0, 31);
472
473 sps = h264->sps[current->seq_parameter_set_id];
474 if (!sps) {
475 av_log(ctx->log_ctx, AV_LOG_ERROR, "SPS id %d not available.\n",
476 current->seq_parameter_set_id);
477 return AVERROR_INVALIDDATA;
478 }
479 h264->active_sps = sps;
480
481 if (sps->vui.nal_hrd_parameters_present_flag) {
482 for (i = 0; i <= sps->vui.nal_hrd_parameters.cpb_cnt_minus1; i++) {
483 length = sps->vui.nal_hrd_parameters.initial_cpb_removal_delay_length_minus1 + 1;
484 xu(length, initial_cpb_removal_delay[SchedSelIdx],
485 current->nal.initial_cpb_removal_delay[i],
486 0, (1 << (uint64_t)length) - 1);
487 xu(length, initial_cpb_removal_delay_offset[SchedSelIdx],
488 current->nal.initial_cpb_removal_delay_offset[i],
489 0, (1 << (uint64_t)length) - 1);
490 }
491 }
492
493 if (sps->vui.vcl_hrd_parameters_present_flag) {
494 for (i = 0; i <= sps->vui.vcl_hrd_parameters.cpb_cnt_minus1; i++) {
495 length = sps->vui.vcl_hrd_parameters.initial_cpb_removal_delay_length_minus1 + 1;
496 xu(length, initial_cpb_removal_delay[SchedSelIdx],
497 current->vcl.initial_cpb_removal_delay[i],
498 0, (1 << (uint64_t)length) - 1);
499 xu(length, initial_cpb_removal_delay_offset[SchedSelIdx],
500 current->vcl.initial_cpb_removal_delay_offset[i],
501 0, (1 << (uint64_t)length) - 1);
502 }
503 }
504
505 return 0;
506 }
507
508 static int FUNC(sei_pic_timestamp)(CodedBitstreamContext *ctx, RWContext *rw,
509 H264RawSEIPicTimestamp *current)
510 {
511 CodedBitstreamH264Context *h264 = ctx->priv_data;
512 const H264RawSPS *sps;
513 uint8_t time_offset_length;
514 int err;
515
516 u(2, ct_type, 0, 2);
517 flag(nuit_field_based_flag);
518 u(5, counting_type, 0, 6);
519 flag(full_timestamp_flag);
520 flag(discontinuity_flag);
521 flag(cnt_dropped_flag);
522 u(8, n_frames, 0, 255);
523 if (current->full_timestamp_flag) {
524 u(6, seconds_value, 0, 59);
525 u(6, minutes_value, 0, 59);
526 u(5, hours_value, 0, 23);
527 } else {
528 flag(seconds_flag);
529 if (current->seconds_flag) {
530 u(6, seconds_value, 0, 59);
531 flag(minutes_flag);
532 if (current->minutes_flag) {
533 u(6, minutes_value, 0, 59);
534 flag(hours_flag);
535 if (current->hours_flag)
536 u(5, hours_value, 0, 23);
537 }
538 }
539 }
540
541 sps = h264->active_sps;
542 if (sps->vui.nal_hrd_parameters_present_flag)
543 time_offset_length = sps->vui.nal_hrd_parameters.time_offset_length;
544 else if (sps->vui.vcl_hrd_parameters_present_flag)
545 time_offset_length = sps->vui.vcl_hrd_parameters.time_offset_length;
546 else
547 time_offset_length = 24;
548
549 if (time_offset_length > 0)
550 u(time_offset_length, time_offset,
551 0, (1 << (uint64_t)time_offset_length) - 1);
552 else
553 infer(time_offset, 0);
554
555 return 0;
556 }
557
558 static int FUNC(sei_pic_timing)(CodedBitstreamContext *ctx, RWContext *rw,
559 H264RawSEIPicTiming *current)
560 {
561 CodedBitstreamH264Context *h264 = ctx->priv_data;
562 const H264RawSPS *sps;
563 int err;
564
565 sps = h264->active_sps;
566 if (!sps) {
567 // If there is exactly one possible SPS but it is not yet active
568 // then just assume that it should be the active one.
569 int i, k = -1;
570 for (i = 0; i < H264_MAX_SPS_COUNT; i++) {
571 if (h264->sps[i]) {
572 if (k >= 0) {
573 k = -1;
574 break;
575 }
576 k = i;
577 }
578 }
579 if (k >= 0)
580 sps = h264->sps[k];
581 }
582 if (!sps) {
583 av_log(ctx->log_ctx, AV_LOG_ERROR,
584 "No active SPS for pic_timing.\n");
585 return AVERROR_INVALIDDATA;
586 }
587
588 if (sps->vui.nal_hrd_parameters_present_flag ||
589 sps->vui.vcl_hrd_parameters_present_flag) {
590 const H264RawHRD *hrd;
591
592 if (sps->vui.nal_hrd_parameters_present_flag)
593 hrd = &sps->vui.nal_hrd_parameters;
594 else if (sps->vui.vcl_hrd_parameters_present_flag)
595 hrd = &sps->vui.vcl_hrd_parameters;
596 else {
597 av_log(ctx->log_ctx, AV_LOG_ERROR,
598 "No HRD parameters for pic_timing.\n");
599 return AVERROR_INVALIDDATA;
600 }
601
602 u(hrd->cpb_removal_delay_length_minus1 + 1, cpb_removal_delay,
603 0, (1 << (uint64_t)hrd->cpb_removal_delay_length_minus1) + 1);
604 u(hrd->dpb_output_delay_length_minus1 + 1, dpb_output_delay,
605 0, (1 << (uint64_t)hrd->dpb_output_delay_length_minus1) + 1);
606 }
607
608 if (sps->vui.pic_struct_present_flag) {
609 static const int num_clock_ts[9] = {
610 1, 1, 1, 2, 2, 3, 3, 2, 3
611 };
612 int i;
613
614 u(4, pic_struct, 0, 8);
615 if (current->pic_struct > 8)
616 return AVERROR_INVALIDDATA;
617
618 for (i = 0; i < num_clock_ts[current->pic_struct]; i++) {
619 flag(clock_timestamp_flag[i]);
620 if (current->clock_timestamp_flag[i])
621 CHECK(FUNC(sei_pic_timestamp)(ctx, rw, &current->timestamp[i]));
622 }
623 }
624
625 return 0;
626 }
627
628 static int FUNC(sei_user_data_registered)(CodedBitstreamContext *ctx, RWContext *rw,
629 H264RawSEIUserDataRegistered *current,
630 uint32_t *payload_size)
631 {
632 int err, i, j;
633
634 u(8, itu_t_t35_country_code, 0x00, 0xff);
635 if (current->itu_t_t35_country_code != 0xff)
636 i = 1;
637 else {
638 u(8, itu_t_t35_country_code_extension_byte, 0x00, 0xff);
639 i = 2;
640 }
641
642 #ifdef READ
643 if (*payload_size < i) {
644 av_log(ctx->log_ctx, AV_LOG_ERROR,
645 "Invalid SEI user data registered payload.\n");
646 return AVERROR_INVALIDDATA;
647 }
648 current->data_length = *payload_size - i;
649 #else
650 *payload_size = i + current->data_length;
651 #endif
652
653 allocate(current->data, current->data_length);
654 for (j = 0; j < current->data_length; j++)
655 xu(8, itu_t_t35_payload_byte, current->data[j], 0x00, 0xff);
656
657 return 0;
658 }
659
660 static int FUNC(sei_user_data_unregistered)(CodedBitstreamContext *ctx, RWContext *rw,
661 H264RawSEIUserDataUnregistered *current,
662 uint32_t *payload_size)
663 {
664 int err, i;
665
666 #ifdef READ
667 if (*payload_size < 16) {
668 av_log(ctx->log_ctx, AV_LOG_ERROR,
669 "Invalid SEI user data unregistered payload.\n");
670 return AVERROR_INVALIDDATA;
671 }
672 current->data_length = *payload_size - 16;
673 #else
674 *payload_size = 16 + current->data_length;
675 #endif
676
677 for (i = 0; i < 16; i++) {
678 xu(8, uuid_iso_iec_11578,
679 current->uuid_iso_iec_11578[i], 0x00, 0xff);
680 }
681
682 allocate(current->data, current->data_length);
683
684 for (i = 0; i < current->data_length; i++)
685 xu(8, user_data_payload_byte, current->data[i], 0x00, 0xff);
686
687 return 0;
688 }
689
690 static int FUNC(sei_recovery_point)(CodedBitstreamContext *ctx, RWContext *rw,
691 H264RawSEIRecoveryPoint *current)
692 {
693 int err;
694
695 ue(recovery_frame_cnt, 0, 65535);
696 flag(exact_match_flag);
697 flag(broken_link_flag);
698 u(2, changing_slice_group_idc, 0, 2);
699
700 return 0;
701 }
702
703 static int FUNC(sei_display_orientation)(CodedBitstreamContext *ctx, RWContext *rw,
704 H264RawSEIDisplayOrientation *current)
705 {
706 int err;
707
708 flag(display_orientation_cancel_flag);
709 if (!current->display_orientation_cancel_flag) {
710 flag(hor_flip);
711 flag(ver_flip);
712 u(16, anticlockwise_rotation, 0, 65535);
713 ue(display_orientation_repetition_period, 0, 16384);
714 flag(display_orientation_extension_flag);
715 }
716
717 return 0;
718 }
719
720 static int FUNC(sei_payload)(CodedBitstreamContext *ctx, RWContext *rw,
721 H264RawSEIPayload *current)
722 {
723 int err, i;
724 int start_position, end_position;
725
726 #ifdef READ
727 start_position = bitstream_tell(rw);
728 #else
729 start_position = put_bits_count(rw);
730 #endif
731
732 switch (current->payload_type) {
733 case H264_SEI_TYPE_BUFFERING_PERIOD:
734 CHECK(FUNC(sei_buffering_period)
735 (ctx, rw, &current->payload.buffering_period));
736 break;
737 case H264_SEI_TYPE_PIC_TIMING:
738 CHECK(FUNC(sei_pic_timing)
739 (ctx, rw, &current->payload.pic_timing));
740 break;
741 case H264_SEI_TYPE_FILLER_PAYLOAD:
742 {
743 av_unused int ff_byte = 0xff;
744 for (i = 0; i < current->payload_size; i++)
745 xu(8, ff_byte, ff_byte, 0xff, 0xff);
746 }
747 break;
748 case H264_SEI_TYPE_USER_DATA_REGISTERED:
749 CHECK(FUNC(sei_user_data_registered)
750 (ctx, rw, &current->payload.user_data_registered, &current->payload_size));
751 break;
752 case H264_SEI_TYPE_USER_DATA_UNREGISTERED:
753 CHECK(FUNC(sei_user_data_unregistered)
754 (ctx, rw, &current->payload.user_data_unregistered, &current->payload_size));
755 break;
756 case H264_SEI_TYPE_RECOVERY_POINT:
757 CHECK(FUNC(sei_recovery_point)
758 (ctx, rw, &current->payload.recovery_point));
759 break;
760 case H264_SEI_TYPE_DISPLAY_ORIENTATION:
761 CHECK(FUNC(sei_display_orientation)
762 (ctx, rw, &current->payload.display_orientation));
763 break;
764 default:
765 {
766 allocate(current->payload.other.data, current->payload_size);
767 for (i = 0; i < current->payload_size; i++)
768 xu(8, payload_byte, current->payload.other.data[i], 0, 255);
769 }
770 }
771
772 if (byte_alignment(rw)) {
773 av_unused int one = 1, zero = 0;
774 xu(1, bit_equal_to_one, one, 1, 1);
775 while (byte_alignment(rw))
776 xu(1, bit_equal_to_zero, zero, 0, 0);
777 }
778
779 #ifdef READ
780 end_position = bitstream_tell(rw);
781 if (end_position < start_position + 8 * current->payload_size) {
782 av_log(ctx->log_ctx, AV_LOG_ERROR, "Incorrect SEI payload length: "
783 "header %d bits, actually %d bits.\n",
784 8 * current->payload_size,
785 end_position - start_position);
786 return AVERROR_INVALIDDATA;
787 }
788 #else
789 end_position = put_bits_count(rw);
790 current->payload_size = (end_position - start_position) / 8;
791 #endif
792
793 return 0;
794 }
795
796 static int FUNC(sei)(CodedBitstreamContext *ctx, RWContext *rw,
797 H264RawSEI *current)
798 {
799 int err, k;
800
801 HEADER("Supplemental Enhancement Information");
802
803 CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header,
804 1 << H264_NAL_SEI));
805
806 #ifdef READ
807 for (k = 0; k < H264_MAX_SEI_PAYLOADS; k++) {
808 uint32_t payload_type = 0;
809 uint32_t payload_size = 0;
810 uint32_t tmp;
811
812 while (bitstream_peek(rw, 8) == 0xff) {
813 xu(8, ff_byte, tmp, 0xff, 0xff);
814 payload_type += 255;
815 }
816 xu(8, last_payload_type_byte, tmp, 0, 254);
817 payload_type += tmp;
818
819 while (bitstream_peek(rw, 8) == 0xff) {
820 xu(8, ff_byte, tmp, 0xff, 0xff);
821 payload_size += 255;
822 }
823 xu(8, last_payload_size_byte, tmp, 0, 254);
824 payload_size += tmp;
825
826 current->payload[k].payload_type = payload_type;
827 current->payload[k].payload_size = payload_size;
828
829 CHECK(FUNC(sei_payload)(ctx, rw, &current->payload[k]));
830
831 if (!cbs_h2645_read_more_rbsp_data(rw))
832 break;
833 }
834 if (k >= H264_MAX_SEI_PAYLOADS) {
835 av_log(ctx->log_ctx, AV_LOG_ERROR, "Too many payloads in "
836 "SEI message: found %d.\n", k);
837 return AVERROR_INVALIDDATA;
838 }
839 current->payload_count = k + 1;
840 #else
841 for (k = 0; k < current->payload_count; k++) {
842 PutBitContext start_state;
843 uint32_t tmp;
844 int need_size, i;
845
846 // Somewhat clumsy: we write the payload twice when
847 // we don't know the size in advance. This will mess
848 // with trace output, but is otherwise harmless.
849 start_state = *rw;
850 need_size = !current->payload[k].payload_size;
851 for (i = 0; i < 1 + need_size; i++) {
852 *rw = start_state;
853
854 tmp = current->payload[k].payload_type;
855 while (tmp >= 255) {
856 xu(8, ff_byte, 0xff, 0xff, 0xff);
857 tmp -= 255;
858 }
859 xu(8, last_payload_type_byte, tmp, 0, 254);
860
861 tmp = current->payload[k].payload_size;
862 while (tmp >= 255) {
863 xu(8, ff_byte, 0xff, 0xff, 0xff);
864 tmp -= 255;
865 }
866 xu(8, last_payload_size_byte, tmp, 0, 254);
867
868 CHECK(FUNC(sei_payload)(ctx, rw, &current->payload[k]));
869 }
870 }
871 #endif
872
873 CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
874
875 return 0;
876 }
877
878 static int FUNC(aud)(CodedBitstreamContext *ctx, RWContext *rw,
879 H264RawAUD *current)
880 {
881 int err;
882
883 HEADER("Access Unit Delimiter");
884
885 CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header,
886 1 << H264_NAL_AUD));
887
888 u(3, primary_pic_type, 0, 7);
889
890 CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
891
892 return 0;
893 }
894
895 static int FUNC(ref_pic_list_modification)(CodedBitstreamContext *ctx, RWContext *rw,
896 H264RawSliceHeader *current)
897 {
898 CodedBitstreamH264Context *h264 = ctx->priv_data;
899 const H264RawSPS *sps = h264->active_sps;
900 int err, i, mopn;
901
902 if (current->slice_type % 5 != 2 &&
903 current->slice_type % 5 != 4) {
904 flag(ref_pic_list_modification_flag_l0);
905 if (current->ref_pic_list_modification_flag_l0) {
906 for (i = 0; i < H264_MAX_RPLM_COUNT; i++) {
907 xue(modification_of_pic_nums_idc,
908 current->rplm_l0[i].modification_of_pic_nums_idc, 0, 3);
909
910 mopn = current->rplm_l0[i].modification_of_pic_nums_idc;
911 if (mopn == 3)
912 break;
913
914 if (mopn == 0 || mopn == 1)
915 xue(abs_diff_pic_num_minus1,
916 current->rplm_l0[i].abs_diff_pic_num_minus1,
917 0, (1 + current->field_pic_flag) *
918 (1 << (sps->log2_max_frame_num_minus4 + 4)));
919 else if (mopn == 2)
920 xue(long_term_pic_num,
921 current->rplm_l0[i].long_term_pic_num,
922 0, sps->max_num_ref_frames - 1);
923 }
924 }
925 }
926
927 if (current->slice_type % 5 == 1) {
928 flag(ref_pic_list_modification_flag_l1);
929 if (current->ref_pic_list_modification_flag_l1) {
930 for (i = 0; i < H264_MAX_RPLM_COUNT; i++) {
931 xue(modification_of_pic_nums_idc,
932 current->rplm_l1[i].modification_of_pic_nums_idc, 0, 3);
933
934 mopn = current->rplm_l1[i].modification_of_pic_nums_idc;
935 if (mopn == 3)
936 break;
937
938 if (mopn == 0 || mopn == 1)
939 xue(abs_diff_pic_num_minus1,
940 current->rplm_l1[i].abs_diff_pic_num_minus1,
941 0, (1 + current->field_pic_flag) *
942 (1 << (sps->log2_max_frame_num_minus4 + 4)));
943 else if (mopn == 2)
944 xue(long_term_pic_num,
945 current->rplm_l1[i].long_term_pic_num,
946 0, sps->max_num_ref_frames - 1);
947 }
948 }
949 }
950
951 return 0;
952 }
953
954 static int FUNC(pred_weight_table)(CodedBitstreamContext *ctx, RWContext *rw,
955 H264RawSliceHeader *current)
956 {
957 CodedBitstreamH264Context *h264 = ctx->priv_data;
958 const H264RawSPS *sps = h264->active_sps;
959 int chroma;
960 int err, i, j;
961
962 ue(luma_log2_weight_denom, 0, 7);
963
964 chroma = !sps->separate_colour_plane_flag && sps->chroma_format_idc != 0;
965 if (chroma)
966 ue(chroma_log2_weight_denom, 0, 7);
967
968 for (i = 0; i <= current->num_ref_idx_l0_active_minus1; i++) {
969 flag(luma_weight_l0_flag[i]);
970 if (current->luma_weight_l0_flag[i]) {
971 se(luma_weight_l0[i], -128, +127);
972 se(luma_offset_l0[i], -128, +127);
973 }
974 if (chroma) {
975 flag(chroma_weight_l0_flag[i]);
976 if (current->chroma_weight_l0_flag[i]) {
977 for (j = 0; j < 2; j++) {
978 se(chroma_weight_l0[i][j], -128, +127);
979 se(chroma_offset_l0[i][j], -128, +127);
980 }
981 }
982 }
983 }
984
985 if (current->slice_type % 5 == 1) {
986 for (i = 0; i <= current->num_ref_idx_l1_active_minus1; i++) {
987 flag(luma_weight_l1_flag[i]);
988 if (current->luma_weight_l1_flag[i]) {
989 se(luma_weight_l1[i], -128, +127);
990 se(luma_offset_l1[i], -128, +127);
991 }
992 if (chroma) {
993 flag(chroma_weight_l1_flag[i]);
994 if (current->chroma_weight_l1_flag[i]) {
995 for (j = 0; j < 2; j++) {
996 se(chroma_weight_l1[i][j], -128, +127);
997 se(chroma_offset_l1[i][j], -128, +127);
998 }
999 }
1000 }
1001 }
1002 }
1003
1004 return 0;
1005 }
1006
1007 static int FUNC(dec_ref_pic_marking)(CodedBitstreamContext *ctx, RWContext *rw,
1008 H264RawSliceHeader *current, int idr_pic_flag)
1009 {
1010 CodedBitstreamH264Context *h264 = ctx->priv_data;
1011 const H264RawSPS *sps = h264->active_sps;
1012 int err, i;
1013 uint32_t mmco;
1014
1015 if (idr_pic_flag) {
1016 flag(no_output_of_prior_pics_flag);
1017 flag(long_term_reference_flag);
1018 } else {
1019 flag(adaptive_ref_pic_marking_mode_flag);
1020 if (current->adaptive_ref_pic_marking_mode_flag) {
1021 for (i = 0; i < H264_MAX_MMCO_COUNT; i++) {
1022 xue(memory_management_control_operation,
1023 current->mmco[i].memory_management_control_operation,
1024 0, 6);
1025
1026 mmco = current->mmco[i].memory_management_control_operation;
1027 if (mmco == 0)
1028 break;
1029
1030 if (mmco == 1 || mmco == 3)
1031 xue(difference_of_pic_nums_minus1,
1032 current->mmco[i].difference_of_pic_nums_minus1,
1033 0, INT32_MAX);
1034 if (mmco == 2)
1035 xue(long_term_pic_num,
1036 current->mmco[i].long_term_pic_num,
1037 0, sps->max_num_ref_frames - 1);
1038 if (mmco == 3 || mmco == 6)
1039 xue(long_term_frame_idx,
1040 current->mmco[i].long_term_frame_idx,
1041 0, sps->max_num_ref_frames - 1);
1042 if (mmco == 4)
1043 xue(max_long_term_frame_idx_plus1,
1044 current->mmco[i].max_long_term_frame_idx_plus1,
1045 0, sps->max_num_ref_frames);
1046 }
1047 if (i == H264_MAX_MMCO_COUNT) {
1048 av_log(ctx->log_ctx, AV_LOG_ERROR, "Too many "
1049 "memory management control operations.\n");
1050 return AVERROR_INVALIDDATA;
1051 }
1052 }
1053 }
1054
1055 return 0;
1056 }
1057
1058 static int FUNC(slice_header)(CodedBitstreamContext *ctx, RWContext *rw,
1059 H264RawSliceHeader *current)
1060 {
1061 CodedBitstreamH264Context *h264 = ctx->priv_data;
1062 const H264RawSPS *sps;
1063 const H264RawPPS *pps;
1064 int err;
1065 int idr_pic_flag;
1066 int slice_type_i, slice_type_p, slice_type_b;
1067 int slice_type_si, slice_type_sp;
1068
1069 HEADER("Slice Header");
1070
1071 CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header,
1072 1 << H264_NAL_SLICE |
1073 1 << H264_NAL_IDR_SLICE |
1074 1 << H264_NAL_AUXILIARY_SLICE));
1075
1076 if (current->nal_unit_header.nal_unit_type == H264_NAL_AUXILIARY_SLICE) {
1077 if (!h264->last_slice_nal_unit_type) {
1078 av_log(ctx->log_ctx, AV_LOG_ERROR, "Auxiliary slice "
1079 "is not decodable without the main picture "
1080 "in the same access unit.\n");
1081 return AVERROR_INVALIDDATA;
1082 }
1083 } else {
1084 h264->last_slice_nal_unit_type =
1085 current->nal_unit_header.nal_unit_type;
1086 }
1087 idr_pic_flag = h264->last_slice_nal_unit_type == H264_NAL_IDR_SLICE;
1088
1089 ue(first_mb_in_slice, 0, H264_MAX_MB_PIC_SIZE - 1);
1090 ue(slice_type, 0, 9);
1091
1092 slice_type_i = current->slice_type % 5 == 2;
1093 slice_type_p = current->slice_type % 5 == 0;
1094 slice_type_b = current->slice_type % 5 == 1;
1095 slice_type_si = current->slice_type % 5 == 4;
1096 slice_type_sp = current->slice_type % 5 == 3;
1097
1098 if (idr_pic_flag && !(slice_type_i || slice_type_si)) {
1099 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid slice type %d "
1100 "for IDR picture.\n", current->slice_type);
1101 return AVERROR_INVALIDDATA;
1102 }
1103
1104 ue(pic_parameter_set_id, 0, 255);
1105
1106 pps = h264->pps[current->pic_parameter_set_id];
1107 if (!pps) {
1108 av_log(ctx->log_ctx, AV_LOG_ERROR, "PPS id %d not available.\n",
1109 current->pic_parameter_set_id);
1110 return AVERROR_INVALIDDATA;
1111 }
1112 h264->active_pps = pps;
1113
1114 sps = h264->sps[pps->seq_parameter_set_id];
1115 if (!sps) {
1116 av_log(ctx->log_ctx, AV_LOG_ERROR, "SPS id %d not available.\n",
1117 pps->seq_parameter_set_id);
1118 return AVERROR_INVALIDDATA;
1119 }
1120 h264->active_sps = sps;
1121
1122 if (sps->separate_colour_plane_flag)
1123 u(2, colour_plane_id, 0, 2);
1124
1125 u(sps->log2_max_frame_num_minus4 + 4, frame_num,
1126 0, (1 << (sps->log2_max_frame_num_minus4 + 4)) - 1);
1127
1128 if (!sps->frame_mbs_only_flag) {
1129 flag(field_pic_flag);
1130 if (current->field_pic_flag)
1131 flag(bottom_field_flag);
1132 else
1133 infer(bottom_field_flag, 0);
1134 } else {
1135 infer(field_pic_flag, 0);
1136 infer(bottom_field_flag, 0);
1137 }
1138
1139 if (idr_pic_flag)
1140 ue(idr_pic_id, 0, 65535);
1141
1142 if (sps->pic_order_cnt_type == 0) {
1143 u(sps->log2_max_pic_order_cnt_lsb_minus4 + 4, pic_order_cnt_lsb,
1144 0, (1 << (sps->log2_max_pic_order_cnt_lsb_minus4 + 4)) - 1);
1145 if (pps->bottom_field_pic_order_in_frame_present_flag &&
1146 !current->field_pic_flag)
1147 se(delta_pic_order_cnt_bottom, INT32_MIN + 1, INT32_MAX);
1148
1149 } else if (sps->pic_order_cnt_type == 1) {
1150 if (!sps->delta_pic_order_always_zero_flag) {
1151 se(delta_pic_order_cnt[0], INT32_MIN + 1, INT32_MAX);
1152 if (pps->bottom_field_pic_order_in_frame_present_flag &&
1153 !current->field_pic_flag)
1154 se(delta_pic_order_cnt[1], INT32_MIN + 1, INT32_MAX);
1155 else
1156 infer(delta_pic_order_cnt[1], 0);
1157 } else {
1158 infer(delta_pic_order_cnt[0], 0);
1159 infer(delta_pic_order_cnt[1], 0);
1160 }
1161 }
1162
1163 if (pps->redundant_pic_cnt_present_flag)
1164 ue(redundant_pic_cnt, 0, 127);
1165
1166 if (slice_type_b)
1167 flag(direct_spatial_mv_pred_flag);
1168
1169 if (slice_type_p || slice_type_sp || slice_type_b) {
1170 flag(num_ref_idx_active_override_flag);
1171 if (current->num_ref_idx_active_override_flag) {
1172 ue(num_ref_idx_l0_active_minus1, 0, 31);
1173 if (slice_type_b)
1174 ue(num_ref_idx_l1_active_minus1, 0, 31);
1175 } else {
1176 infer(num_ref_idx_l0_active_minus1,
1177 pps->num_ref_idx_l0_default_active_minus1);
1178 infer(num_ref_idx_l1_active_minus1,
1179 pps->num_ref_idx_l1_default_active_minus1);
1180 }
1181 }
1182
1183 if (current->nal_unit_header.nal_unit_type == 20 ||
1184 current->nal_unit_header.nal_unit_type == 21) {
1185 av_log(ctx->log_ctx, AV_LOG_ERROR, "MVC / 3DAVC not supported.\n");
1186 return AVERROR_PATCHWELCOME;
1187 } else {
1188 CHECK(FUNC(ref_pic_list_modification)(ctx, rw, current));
1189 }
1190
1191 if ((pps->weighted_pred_flag && (slice_type_p || slice_type_sp)) ||
1192 (pps->weighted_bipred_idc == 1 && slice_type_b)) {
1193 CHECK(FUNC(pred_weight_table)(ctx, rw, current));
1194 }
1195
1196 if (current->nal_unit_header.nal_ref_idc != 0) {
1197 CHECK(FUNC(dec_ref_pic_marking)(ctx, rw, current, idr_pic_flag));
1198 }
1199
1200 if (pps->entropy_coding_mode_flag &&
1201 !slice_type_i && !slice_type_si) {
1202 ue(cabac_init_idc, 0, 2);
1203 }
1204
1205 se(slice_qp_delta, - 51 - 6 * sps->bit_depth_luma_minus8,
1206 + 51 + 6 * sps->bit_depth_luma_minus8);
1207 if (slice_type_sp || slice_type_si) {
1208 if (slice_type_sp)
1209 flag(sp_for_switch_flag);
1210 se(slice_qs_delta, -51, +51);
1211 }
1212
1213 if (pps->deblocking_filter_control_present_flag) {
1214 ue(disable_deblocking_filter_idc, 0, 2);
1215 if (current->disable_deblocking_filter_idc != 1) {
1216 se(slice_alpha_c0_offset_div2, -6, +6);
1217 se(slice_beta_offset_div2, -6, +6);
1218 } else {
1219 infer(slice_alpha_c0_offset_div2, 0);
1220 infer(slice_beta_offset_div2, 0);
1221 }
1222 } else {
1223 infer(disable_deblocking_filter_idc, 0);
1224 infer(slice_alpha_c0_offset_div2, 0);
1225 infer(slice_beta_offset_div2, 0);
1226 }
1227
1228 if (pps->num_slice_groups_minus1 > 0 &&
1229 pps->slice_group_map_type >= 3 &&
1230 pps->slice_group_map_type <= 5) {
1231 unsigned int pic_size, max, bits;
1232
1233 pic_size = (sps->pic_width_in_mbs_minus1 + 1) *
1234 (sps->pic_height_in_map_units_minus1 + 1);
1235 max = (pic_size + pps->slice_group_change_rate_minus1) /
1236 (pps->slice_group_change_rate_minus1 + 1);
1237 bits = av_log2(2 * max - 1);
1238
1239 u(bits, slice_group_change_cycle, 0, max);
1240 }
1241
1242 if (pps->entropy_coding_mode_flag) {
1243 av_unused int one = 1;
1244 while (byte_alignment(rw))
1245 xu(1, cabac_alignment_one_bit, one, 1, 1);
1246 }
1247
1248 return 0;
1249 }
1250
1251 static int FUNC(filler)(CodedBitstreamContext *ctx, RWContext *rw,
1252 H264RawFiller *current)
1253 {
1254 av_unused int ff_byte = 0xff;
1255 int err;
1256
1257 HEADER("Filler Data");
1258
1259 CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header,
1260 1 << H264_NAL_FILLER_DATA));
1261
1262 #ifdef READ
1263 while (bitstream_peek(rw, 8) == 0xff) {
1264 xu(8, ff_byte, ff_byte, 0xff, 0xff);
1265 ++current->filler_size;
1266 }
1267 #else
1268 {
1269 uint32_t i;
1270 for (i = 0; i < current->filler_size; i++)
1271 xu(8, ff_byte, ff_byte, 0xff, 0xff);
1272 }
1273 #endif
1274
1275 CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
1276
1277 return 0;
1278 }
Modern FFMPEG