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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 / MPEG-4 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 "mathops.h"
33#include "avcodec.h"
34#include "h264data.h"
35#include "h264_ps.h"
36#include "golomb.h"
37
38#define MAX_LOG2_MAX_FRAME_NUM (12 + 4)
39#define MIN_LOG2_MAX_FRAME_NUM 4
40
41#define EXTENDED_SAR 255
42
43static const uint8_t default_scaling4[2][16] = {
44 { 6, 13, 20, 28, 13, 20, 28, 32,
45 20, 28, 32, 37, 28, 32, 37, 42 },
46 { 10, 14, 20, 24, 14, 20, 24, 27,
47 20, 24, 27, 30, 24, 27, 30, 34 }
48};
49
50static const uint8_t default_scaling8[2][64] = {
51 { 6, 10, 13, 16, 18, 23, 25, 27,
52 10, 11, 16, 18, 23, 25, 27, 29,
53 13, 16, 18, 23, 25, 27, 29, 31,
54 16, 18, 23, 25, 27, 29, 31, 33,
55 18, 23, 25, 27, 29, 31, 33, 36,
56 23, 25, 27, 29, 31, 33, 36, 38,
57 25, 27, 29, 31, 33, 36, 38, 40,
58 27, 29, 31, 33, 36, 38, 40, 42 },
59 { 9, 13, 15, 17, 19, 21, 22, 24,
60 13, 13, 17, 19, 21, 22, 24, 25,
61 15, 17, 19, 21, 22, 24, 25, 27,
62 17, 19, 21, 22, 24, 25, 27, 28,
63 19, 21, 22, 24, 25, 27, 28, 30,
64 21, 22, 24, 25, 27, 28, 30, 32,
65 22, 24, 25, 27, 28, 30, 32, 33,
66 24, 25, 27, 28, 30, 32, 33, 35 }
67};
68
69/* maximum number of MBs in the DPB for a given level */
70static const int level_max_dpb_mbs[][2] = {
71 { 10, 396 },
72 { 11, 900 },
73 { 12, 2376 },
74 { 13, 2376 },
75 { 20, 2376 },
76 { 21, 4752 },
77 { 22, 8100 },
78 { 30, 8100 },
79 { 31, 18000 },
80 { 32, 20480 },
81 { 40, 32768 },
82 { 41, 32768 },
83 { 42, 34816 },
84 { 50, 110400 },
85 { 51, 184320 },
86 { 52, 184320 },
87};
88
89static void remove_pps(H264ParamSets *s, int id)
90{
91 av_buffer_unref(&s->pps_list[id]);
92}
93
94static void remove_sps(H264ParamSets *s, int id)
95{
96#if 0
97 int i;
98 if (s->sps_list[id]) {
99 /* drop all PPS that depend on this SPS */
100 for (i = 0; i < FF_ARRAY_ELEMS(s->pps_list); i++)
101 if (s->pps_list[i] && ((PPS*)s->pps_list[i]->data)->sps_id == id)
102 remove_pps(s, i);
103 }
104#endif
105 av_buffer_unref(&s->sps_list[id]);
106}
107
108static inline int decode_hrd_parameters(GetBitContext *gb, AVCodecContext *avctx,
109 SPS *sps)
110{
111 int cpb_count, i;
112 cpb_count = get_ue_golomb_31(gb) + 1;
113
114 if (cpb_count > 32U) {
115 av_log(avctx, AV_LOG_ERROR, "cpb_count %d invalid\n", cpb_count);
116 return AVERROR_INVALIDDATA;
117 }
118
119 get_bits(gb, 4); /* bit_rate_scale */
120 get_bits(gb, 4); /* cpb_size_scale */
121 for (i = 0; i < cpb_count; i++) {
122 get_ue_golomb_long(gb); /* bit_rate_value_minus1 */
123 get_ue_golomb_long(gb); /* cpb_size_value_minus1 */
124 get_bits1(gb); /* cbr_flag */
125 }
126 sps->initial_cpb_removal_delay_length = get_bits(gb, 5) + 1;
127 sps->cpb_removal_delay_length = get_bits(gb, 5) + 1;
128 sps->dpb_output_delay_length = get_bits(gb, 5) + 1;
129 sps->time_offset_length = get_bits(gb, 5);
130 sps->cpb_cnt = cpb_count;
131 return 0;
132}
133
134static inline int decode_vui_parameters(GetBitContext *gb, AVCodecContext *avctx,
135 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(gb);
141
142 if (aspect_ratio_info_present_flag) {
143 aspect_ratio_idc = get_bits(gb, 8);
144 if (aspect_ratio_idc == EXTENDED_SAR) {
145 sps->sar.num = get_bits(gb, 16);
146 sps->sar.den = get_bits(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(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(gb)) /* overscan_info_present_flag */
159 get_bits1(gb); /* overscan_appropriate_flag */
160
161 sps->video_signal_type_present_flag = get_bits1(gb);
162 if (sps->video_signal_type_present_flag) {
163 get_bits(gb, 3); /* video_format */
164 sps->full_range = get_bits1(gb); /* video_full_range_flag */
165
166 sps->colour_description_present_flag = get_bits1(gb);
167 if (sps->colour_description_present_flag) {
168 sps->color_primaries = get_bits(gb, 8); /* colour_primaries */
169 sps->color_trc = get_bits(gb, 8); /* transfer_characteristics */
170 sps->colorspace = get_bits(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(gb)) {
182 /* chroma_sample_location_type_top_field */
183 avctx->chroma_sample_location = get_ue_golomb(gb) + 1;
184 get_ue_golomb(gb); /* chroma_sample_location_type_bottom_field */
185 }
186
187 if (show_bits1(gb) && get_bits_left(gb) < 10) {
188 av_log(avctx, AV_LOG_WARNING, "Truncated VUI\n");
189 return 0;
190 }
191
192 sps->timing_info_present_flag = get_bits1(gb);
193 if (sps->timing_info_present_flag) {
194 unsigned num_units_in_tick = get_bits_long(gb, 32);
195 unsigned time_scale = get_bits_long(gb, 32);
196 if (!num_units_in_tick || !time_scale) {
197 av_log(avctx, AV_LOG_ERROR,
198 "time_scale/num_units_in_tick invalid or unsupported (%u/%u)\n",
199 time_scale, num_units_in_tick);
200 sps->timing_info_present_flag = 0;
201 } else {
202 sps->num_units_in_tick = num_units_in_tick;
203 sps->time_scale = time_scale;
204 }
205 sps->fixed_frame_rate_flag = get_bits1(gb);
206 }
207
208 sps->nal_hrd_parameters_present_flag = get_bits1(gb);
209 if (sps->nal_hrd_parameters_present_flag)
210 if (decode_hrd_parameters(gb, avctx, sps) < 0)
211 return AVERROR_INVALIDDATA;
212 sps->vcl_hrd_parameters_present_flag = get_bits1(gb);
213 if (sps->vcl_hrd_parameters_present_flag)
214 if (decode_hrd_parameters(gb, avctx, sps) < 0)
215 return AVERROR_INVALIDDATA;
216 if (sps->nal_hrd_parameters_present_flag ||
217 sps->vcl_hrd_parameters_present_flag)
218 get_bits1(gb); /* low_delay_hrd_flag */
219 sps->pic_struct_present_flag = get_bits1(gb);
220 if (!get_bits_left(gb))
221 return 0;
222 sps->bitstream_restriction_flag = get_bits1(gb);
223 if (sps->bitstream_restriction_flag) {
224 get_bits1(gb); /* motion_vectors_over_pic_boundaries_flag */
225 get_ue_golomb(gb); /* max_bytes_per_pic_denom */
226 get_ue_golomb(gb); /* max_bits_per_mb_denom */
227 get_ue_golomb(gb); /* log2_max_mv_length_horizontal */
228 get_ue_golomb(gb); /* log2_max_mv_length_vertical */
229 sps->num_reorder_frames = get_ue_golomb(gb);
230 get_ue_golomb(gb); /*max_dec_frame_buffering*/
231
232 if (get_bits_left(gb) < 0) {
233 sps->num_reorder_frames = 0;
234 sps->bitstream_restriction_flag = 0;
235 }
236
237 if (sps->num_reorder_frames > 16U
238 /* max_dec_frame_buffering || max_dec_frame_buffering > 16 */) {
239 av_log(avctx, AV_LOG_ERROR,
240 "Clipping illegal num_reorder_frames %d\n",
241 sps->num_reorder_frames);
242 sps->num_reorder_frames = 16;
243 return AVERROR_INVALIDDATA;
244 }
245 }
246
247 return 0;
248}
249
250static int decode_scaling_list(GetBitContext *gb, uint8_t *factors, int size,
251 const uint8_t *jvt_list,
252 const uint8_t *fallback_list)
253{
254 int i, last = 8, next = 8;
255 const uint8_t *scan = size == 16 ? ff_zigzag_scan : ff_zigzag_direct;
256 if (!get_bits1(gb)) /* matrix not written, we use the predicted one */
257 memcpy(factors, fallback_list, size * sizeof(uint8_t));
258 else
259 for (i = 0; i < size; i++) {
260 if (next) {
261 int v = get_se_golomb(gb);
262 if (v < -128 || v > 127) {
263 av_log(NULL, AV_LOG_ERROR, "delta scale %d is invalid\n", v);
264 return AVERROR_INVALIDDATA;
265 }
266 next = (last + v) & 0xff;
267 }
268 if (!i && !next) { /* matrix not written, we use the preset one */
269 memcpy(factors, jvt_list, size * sizeof(uint8_t));
270 break;
271 }
272 last = factors[scan[i]] = next ? next : last;
273 }
274 return 0;
275}
276
277/* returns non zero if the provided SPS scaling matrix has been filled */
278static int decode_scaling_matrices(GetBitContext *gb, const SPS *sps,
279 const PPS *pps, int is_sps,
280 uint8_t(*scaling_matrix4)[16],
281 uint8_t(*scaling_matrix8)[64])
282{
283 int fallback_sps = !is_sps && sps->scaling_matrix_present;
284 const uint8_t *fallback[4] = {
285 fallback_sps ? sps->scaling_matrix4[0] : default_scaling4[0],
286 fallback_sps ? sps->scaling_matrix4[3] : default_scaling4[1],
287 fallback_sps ? sps->scaling_matrix8[0] : default_scaling8[0],
288 fallback_sps ? sps->scaling_matrix8[3] : default_scaling8[1]
289 };
290 int ret = 0;
291 if (get_bits1(gb)) {
292 ret |= decode_scaling_list(gb, scaling_matrix4[0], 16, default_scaling4[0], fallback[0]); // Intra, Y
293 ret |= decode_scaling_list(gb, scaling_matrix4[1], 16, default_scaling4[0], scaling_matrix4[0]); // Intra, Cr
294 ret |= decode_scaling_list(gb, scaling_matrix4[2], 16, default_scaling4[0], scaling_matrix4[1]); // Intra, Cb
295 ret |= decode_scaling_list(gb, scaling_matrix4[3], 16, default_scaling4[1], fallback[1]); // Inter, Y
296 ret |= decode_scaling_list(gb, scaling_matrix4[4], 16, default_scaling4[1], scaling_matrix4[3]); // Inter, Cr
297 ret |= decode_scaling_list(gb, scaling_matrix4[5], 16, default_scaling4[1], scaling_matrix4[4]); // Inter, Cb
298 if (is_sps || pps->transform_8x8_mode) {
299 ret |= decode_scaling_list(gb, scaling_matrix8[0], 64, default_scaling8[0], fallback[2]); // Intra, Y
300 ret |= decode_scaling_list(gb, scaling_matrix8[3], 64, default_scaling8[1], fallback[3]); // Inter, Y
301 if (sps->chroma_format_idc == 3) {
302 ret |= decode_scaling_list(gb, scaling_matrix8[1], 64, default_scaling8[0], scaling_matrix8[0]); // Intra, Cr
303 ret |= decode_scaling_list(gb, scaling_matrix8[4], 64, default_scaling8[1], scaling_matrix8[3]); // Inter, Cr
304 ret |= decode_scaling_list(gb, scaling_matrix8[2], 64, default_scaling8[0], scaling_matrix8[1]); // Intra, Cb
305 ret |= decode_scaling_list(gb, scaling_matrix8[5], 64, default_scaling8[1], scaling_matrix8[4]); // Inter, Cb
306 }
307 }
308 if (!ret)
309 ret = is_sps;
310 }
311
312 return ret;
313}
314
315void ff_h264_ps_uninit(H264ParamSets *ps)
316{
317 int i;
318
319 for (i = 0; i < MAX_SPS_COUNT; i++)
320 av_buffer_unref(&ps->sps_list[i]);
321
322 for (i = 0; i < MAX_PPS_COUNT; i++)
323 av_buffer_unref(&ps->pps_list[i]);
324
325 av_buffer_unref(&ps->sps_ref);
326 av_buffer_unref(&ps->pps_ref);
327
328 ps->pps = NULL;
329 ps->sps = NULL;
330}
331
332int ff_h264_decode_seq_parameter_set(GetBitContext *gb, AVCodecContext *avctx,
333 H264ParamSets *ps, int ignore_truncation)
334{
335 AVBufferRef *sps_buf;
336 int profile_idc, level_idc, constraint_set_flags = 0;
337 unsigned int sps_id;
338 int i, log2_max_frame_num_minus4;
339 SPS *sps;
340 int ret;
341
342 sps_buf = av_buffer_allocz(sizeof(*sps));
343 if (!sps_buf)
344 return AVERROR(ENOMEM);
345 sps = (SPS*)sps_buf->data;
346
347 sps->data_size = gb->buffer_end - gb->buffer;
348 if (sps->data_size > sizeof(sps->data)) {
349 av_log(avctx, AV_LOG_WARNING, "Truncating likely oversized SPS\n");
350 sps->data_size = sizeof(sps->data);
351 }
352 memcpy(sps->data, gb->buffer, sps->data_size);
353
354 profile_idc = get_bits(gb, 8);
355 constraint_set_flags |= get_bits1(gb) << 0; // constraint_set0_flag
356 constraint_set_flags |= get_bits1(gb) << 1; // constraint_set1_flag
357 constraint_set_flags |= get_bits1(gb) << 2; // constraint_set2_flag
358 constraint_set_flags |= get_bits1(gb) << 3; // constraint_set3_flag
359 constraint_set_flags |= get_bits1(gb) << 4; // constraint_set4_flag
360 constraint_set_flags |= get_bits1(gb) << 5; // constraint_set5_flag
361 skip_bits(gb, 2); // reserved_zero_2bits
362 level_idc = get_bits(gb, 8);
363 sps_id = get_ue_golomb_31(gb);
364
365 if (sps_id >= MAX_SPS_COUNT) {
366 av_log(avctx, AV_LOG_ERROR, "sps_id %u out of range\n", sps_id);
367 goto fail;
368 }
369
370 sps->sps_id = sps_id;
371 sps->time_offset_length = 24;
372 sps->profile_idc = profile_idc;
373 sps->constraint_set_flags = constraint_set_flags;
374 sps->level_idc = level_idc;
375 sps->full_range = -1;
376
377 memset(sps->scaling_matrix4, 16, sizeof(sps->scaling_matrix4));
378 memset(sps->scaling_matrix8, 16, sizeof(sps->scaling_matrix8));
379 sps->scaling_matrix_present = 0;
380 sps->colorspace = 2; //AVCOL_SPC_UNSPECIFIED
381
382 if (sps->profile_idc == 100 || // High profile
383 sps->profile_idc == 110 || // High10 profile
384 sps->profile_idc == 122 || // High422 profile
385 sps->profile_idc == 244 || // High444 Predictive profile
386 sps->profile_idc == 44 || // Cavlc444 profile
387 sps->profile_idc == 83 || // Scalable Constrained High profile (SVC)
388 sps->profile_idc == 86 || // Scalable High Intra profile (SVC)
389 sps->profile_idc == 118 || // Stereo High profile (MVC)
390 sps->profile_idc == 128 || // Multiview High profile (MVC)
391 sps->profile_idc == 138 || // Multiview Depth High profile (MVCD)
392 sps->profile_idc == 144) { // old High444 profile
393 sps->chroma_format_idc = get_ue_golomb_31(gb);
394 if (sps->chroma_format_idc > 3U) {
395 avpriv_request_sample(avctx, "chroma_format_idc %u",
396 sps->chroma_format_idc);
397 goto fail;
398 } else if (sps->chroma_format_idc == 3) {
399 sps->residual_color_transform_flag = get_bits1(gb);
400 if (sps->residual_color_transform_flag) {
401 av_log(avctx, AV_LOG_ERROR, "separate color planes are not supported\n");
402 goto fail;
403 }
404 }
405 sps->bit_depth_luma = get_ue_golomb(gb) + 8;
406 sps->bit_depth_chroma = get_ue_golomb(gb) + 8;
407 if (sps->bit_depth_chroma != sps->bit_depth_luma) {
408 avpriv_request_sample(avctx,
409 "Different chroma and luma bit depth");
410 goto fail;
411 }
412 if (sps->bit_depth_luma < 8 || sps->bit_depth_luma > 14 ||
413 sps->bit_depth_chroma < 8 || sps->bit_depth_chroma > 14) {
414 av_log(avctx, AV_LOG_ERROR, "illegal bit depth value (%d, %d)\n",
415 sps->bit_depth_luma, sps->bit_depth_chroma);
416 goto fail;
417 }
418 sps->transform_bypass = get_bits1(gb);
419 ret = decode_scaling_matrices(gb, sps, NULL, 1,
420 sps->scaling_matrix4, sps->scaling_matrix8);
421 if (ret < 0)
422 goto fail;
423 sps->scaling_matrix_present |= ret;
424 } else {
425 sps->chroma_format_idc = 1;
426 sps->bit_depth_luma = 8;
427 sps->bit_depth_chroma = 8;
428 }
429
430 log2_max_frame_num_minus4 = get_ue_golomb(gb);
431 if (log2_max_frame_num_minus4 < MIN_LOG2_MAX_FRAME_NUM - 4 ||
432 log2_max_frame_num_minus4 > MAX_LOG2_MAX_FRAME_NUM - 4) {
433 av_log(avctx, AV_LOG_ERROR,
434 "log2_max_frame_num_minus4 out of range (0-12): %d\n",
435 log2_max_frame_num_minus4);
436 goto fail;
437 }
438 sps->log2_max_frame_num = log2_max_frame_num_minus4 + 4;
439
440 sps->poc_type = get_ue_golomb_31(gb);
441
442 if (sps->poc_type == 0) { // FIXME #define
443 unsigned t = get_ue_golomb(gb);
444 if (t>12) {
445 av_log(avctx, AV_LOG_ERROR, "log2_max_poc_lsb (%d) is out of range\n", t);
446 goto fail;
447 }
448 sps->log2_max_poc_lsb = t + 4;
449 } else if (sps->poc_type == 1) { // FIXME #define
450 sps->delta_pic_order_always_zero_flag = get_bits1(gb);
451 sps->offset_for_non_ref_pic = get_se_golomb(gb);
452 sps->offset_for_top_to_bottom_field = get_se_golomb(gb);
453 sps->poc_cycle_length = get_ue_golomb(gb);
454
455 if ((unsigned)sps->poc_cycle_length >=
456 FF_ARRAY_ELEMS(sps->offset_for_ref_frame)) {
457 av_log(avctx, AV_LOG_ERROR,
458 "poc_cycle_length overflow %d\n", sps->poc_cycle_length);
459 goto fail;
460 }
461
462 for (i = 0; i < sps->poc_cycle_length; i++)
463 sps->offset_for_ref_frame[i] = get_se_golomb(gb);
464 } else if (sps->poc_type != 2) {
465 av_log(avctx, AV_LOG_ERROR, "illegal POC type %d\n", sps->poc_type);
466 goto fail;
467 }
468
469 sps->ref_frame_count = get_ue_golomb_31(gb);
470 if (avctx->codec_tag == MKTAG('S', 'M', 'V', '2'))
471 sps->ref_frame_count = FFMAX(2, sps->ref_frame_count);
472 if (sps->ref_frame_count > MAX_DELAYED_PIC_COUNT) {
473 av_log(avctx, AV_LOG_ERROR,
474 "too many reference frames %d\n", sps->ref_frame_count);
475 goto fail;
476 }
477 sps->gaps_in_frame_num_allowed_flag = get_bits1(gb);
478 sps->mb_width = get_ue_golomb(gb) + 1;
479 sps->mb_height = get_ue_golomb(gb) + 1;
480
481 sps->frame_mbs_only_flag = get_bits1(gb);
482
483 if (sps->mb_height >= INT_MAX / 2U) {
484 av_log(avctx, AV_LOG_ERROR, "height overflow\n");
485 goto fail;
486 }
487 sps->mb_height *= 2 - sps->frame_mbs_only_flag;
488
489 if (!sps->frame_mbs_only_flag)
490 sps->mb_aff = get_bits1(gb);
491 else
492 sps->mb_aff = 0;
493
494 if ((unsigned)sps->mb_width >= INT_MAX / 16 ||
495 (unsigned)sps->mb_height >= INT_MAX / 16 ||
496 av_image_check_size(16 * sps->mb_width,
497 16 * sps->mb_height, 0, avctx)) {
498 av_log(avctx, AV_LOG_ERROR, "mb_width/height overflow\n");
499 goto fail;
500 }
501
502 sps->direct_8x8_inference_flag = get_bits1(gb);
503
504#ifndef ALLOW_INTERLACE
505 if (sps->mb_aff)
506 av_log(avctx, AV_LOG_ERROR,
507 "MBAFF support not included; enable it at compile-time.\n");
508#endif
509 sps->crop = get_bits1(gb);
510 if (sps->crop) {
511 unsigned int crop_left = get_ue_golomb(gb);
512 unsigned int crop_right = get_ue_golomb(gb);
513 unsigned int crop_top = get_ue_golomb(gb);
514 unsigned int crop_bottom = get_ue_golomb(gb);
515 int width = 16 * sps->mb_width;
516 int height = 16 * sps->mb_height;
517
518 if (avctx->flags2 & AV_CODEC_FLAG2_IGNORE_CROP) {
519 av_log(avctx, AV_LOG_DEBUG, "discarding sps cropping, original "
520 "values are l:%d r:%d t:%d b:%d\n",
521 crop_left, crop_right, crop_top, crop_bottom);
522
523 sps->crop_left =
524 sps->crop_right =
525 sps->crop_top =
526 sps->crop_bottom = 0;
527 } else {
528 int vsub = (sps->chroma_format_idc == 1) ? 1 : 0;
529 int hsub = (sps->chroma_format_idc == 1 ||
530 sps->chroma_format_idc == 2) ? 1 : 0;
531 int step_x = 1 << hsub;
532 int step_y = (2 - sps->frame_mbs_only_flag) << vsub;
533
534 if (crop_left & (0x1F >> (sps->bit_depth_luma > 8)) &&
535 !(avctx->flags & AV_CODEC_FLAG_UNALIGNED)) {
536 crop_left &= ~(0x1F >> (sps->bit_depth_luma > 8));
537 av_log(avctx, AV_LOG_WARNING,
538 "Reducing left cropping to %d "
539 "chroma samples to preserve alignment.\n",
540 crop_left);
541 }
542
543 if (crop_left > (unsigned)INT_MAX / 4 / step_x ||
544 crop_right > (unsigned)INT_MAX / 4 / step_x ||
545 crop_top > (unsigned)INT_MAX / 4 / step_y ||
546 crop_bottom> (unsigned)INT_MAX / 4 / step_y ||
547 (crop_left + crop_right ) * step_x >= width ||
548 (crop_top + crop_bottom) * step_y >= height
549 ) {
550 av_log(avctx, AV_LOG_ERROR, "crop values invalid %d %d %d %d / %d %d\n", crop_left, crop_right, crop_top, crop_bottom, width, height);
551 goto fail;
552 }
553
554 sps->crop_left = crop_left * step_x;
555 sps->crop_right = crop_right * step_x;
556 sps->crop_top = crop_top * step_y;
557 sps->crop_bottom = crop_bottom * step_y;
558 }
559 } else {
560 sps->crop_left =
561 sps->crop_right =
562 sps->crop_top =
563 sps->crop_bottom =
564 sps->crop = 0;
565 }
566
567 sps->vui_parameters_present_flag = get_bits1(gb);
568 if (sps->vui_parameters_present_flag) {
569 int ret = decode_vui_parameters(gb, avctx, sps);
570 if (ret < 0)
571 goto fail;
572 }
573
574 if (get_bits_left(gb) < 0) {
575 av_log(avctx, ignore_truncation ? AV_LOG_WARNING : AV_LOG_ERROR,
576 "Overread %s by %d bits\n", sps->vui_parameters_present_flag ? "VUI" : "SPS", -get_bits_left(gb));
577 if (!ignore_truncation)
578 goto fail;
579 }
580
581 /* if the maximum delay is not stored in the SPS, derive it based on the
582 * level */
583 if (!sps->bitstream_restriction_flag &&
584 (sps->ref_frame_count || avctx->strict_std_compliance >= FF_COMPLIANCE_STRICT)) {
585 sps->num_reorder_frames = MAX_DELAYED_PIC_COUNT - 1;
586 for (i = 0; i < FF_ARRAY_ELEMS(level_max_dpb_mbs); i++) {
587 if (level_max_dpb_mbs[i][0] == sps->level_idc) {
588 sps->num_reorder_frames = FFMIN(level_max_dpb_mbs[i][1] / (sps->mb_width * sps->mb_height),
589 sps->num_reorder_frames);
590 break;
591 }
592 }
593 }
594
595 if (!sps->sar.den)
596 sps->sar.den = 1;
597
598 if (avctx->debug & FF_DEBUG_PICT_INFO) {
599 static const char csp[4][5] = { "Gray", "420", "422", "444" };
600 av_log(avctx, AV_LOG_DEBUG,
601 "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",
602 sps_id, sps->profile_idc, sps->level_idc,
603 sps->poc_type,
604 sps->ref_frame_count,
605 sps->mb_width, sps->mb_height,
606 sps->frame_mbs_only_flag ? "FRM" : (sps->mb_aff ? "MB-AFF" : "PIC-AFF"),
607 sps->direct_8x8_inference_flag ? "8B8" : "",
608 sps->crop_left, sps->crop_right,
609 sps->crop_top, sps->crop_bottom,
610 sps->vui_parameters_present_flag ? "VUI" : "",
611 csp[sps->chroma_format_idc],
612 sps->timing_info_present_flag ? sps->num_units_in_tick : 0,
613 sps->timing_info_present_flag ? sps->time_scale : 0,
614 sps->bit_depth_luma,
615 sps->bitstream_restriction_flag ? sps->num_reorder_frames : -1
616 );
617 }
618
619 /* check if this is a repeat of an already parsed SPS, then keep the
620 * original one.
621 * otherwise drop all PPSes that depend on it */
622 if (ps->sps_list[sps_id] &&
623 !memcmp(ps->sps_list[sps_id]->data, sps_buf->data, sps_buf->size)) {
624 av_buffer_unref(&sps_buf);
625 } else {
626 remove_sps(ps, sps_id);
627 ps->sps_list[sps_id] = sps_buf;
628 }
629
630 return 0;
631
632fail:
633 av_buffer_unref(&sps_buf);
634 return AVERROR_INVALIDDATA;
635}
636
637static void init_dequant8_coeff_table(PPS *pps, const SPS *sps)
638{
639 int i, j, q, x;
640 const int max_qp = 51 + 6 * (sps->bit_depth_luma - 8);
641
642 for (i = 0; i < 6; i++) {
643 pps->dequant8_coeff[i] = pps->dequant8_buffer[i];
644 for (j = 0; j < i; j++)
645 if (!memcmp(pps->scaling_matrix8[j], pps->scaling_matrix8[i],
646 64 * sizeof(uint8_t))) {
647 pps->dequant8_coeff[i] = pps->dequant8_buffer[j];
648 break;
649 }
650 if (j < i)
651 continue;
652
653 for (q = 0; q < max_qp + 1; q++) {
654 int shift = ff_h264_quant_div6[q];
655 int idx = ff_h264_quant_rem6[q];
656 for (x = 0; x < 64; x++)
657 pps->dequant8_coeff[i][q][(x >> 3) | ((x & 7) << 3)] =
658 ((uint32_t)ff_h264_dequant8_coeff_init[idx][ff_h264_dequant8_coeff_init_scan[((x >> 1) & 12) | (x & 3)]] *
659 pps->scaling_matrix8[i][x]) << shift;
660 }
661 }
662}
663
664static void init_dequant4_coeff_table(PPS *pps, const SPS *sps)
665{
666 int i, j, q, x;
667 const int max_qp = 51 + 6 * (sps->bit_depth_luma - 8);
668 for (i = 0; i < 6; i++) {
669 pps->dequant4_coeff[i] = pps->dequant4_buffer[i];
670 for (j = 0; j < i; j++)
671 if (!memcmp(pps->scaling_matrix4[j], pps->scaling_matrix4[i],
672 16 * sizeof(uint8_t))) {
673 pps->dequant4_coeff[i] = pps->dequant4_buffer[j];
674 break;
675 }
676 if (j < i)
677 continue;
678
679 for (q = 0; q < max_qp + 1; q++) {
680 int shift = ff_h264_quant_div6[q] + 2;
681 int idx = ff_h264_quant_rem6[q];
682 for (x = 0; x < 16; x++)
683 pps->dequant4_coeff[i][q][(x >> 2) | ((x << 2) & 0xF)] =
684 ((uint32_t)ff_h264_dequant4_coeff_init[idx][(x & 1) + ((x >> 2) & 1)] *
685 pps->scaling_matrix4[i][x]) << shift;
686 }
687 }
688}
689
690static void init_dequant_tables(PPS *pps, const SPS *sps)
691{
692 int i, x;
693 init_dequant4_coeff_table(pps, sps);
694 memset(pps->dequant8_coeff, 0, sizeof(pps->dequant8_coeff));
695
696 if (pps->transform_8x8_mode)
697 init_dequant8_coeff_table(pps, sps);
698 if (sps->transform_bypass) {
699 for (i = 0; i < 6; i++)
700 for (x = 0; x < 16; x++)
701 pps->dequant4_coeff[i][0][x] = 1 << 6;
702 if (pps->transform_8x8_mode)
703 for (i = 0; i < 6; i++)
704 for (x = 0; x < 64; x++)
705 pps->dequant8_coeff[i][0][x] = 1 << 6;
706 }
707}
708
709static void build_qp_table(PPS *pps, int t, int index, const int depth)
710{
711 int i;
712 const int max_qp = 51 + 6 * (depth - 8);
713 for (i = 0; i < max_qp + 1; i++)
714 pps->chroma_qp_table[t][i] =
715 ff_h264_chroma_qp[depth - 8][av_clip(i + index, 0, max_qp)];
716}
717
718static int more_rbsp_data_in_pps(const SPS *sps, void *logctx)
719{
720 int profile_idc = sps->profile_idc;
721
722 if ((profile_idc == 66 || profile_idc == 77 ||
723 profile_idc == 88) && (sps->constraint_set_flags & 7)) {
724 av_log(logctx, AV_LOG_VERBOSE,
725 "Current profile doesn't provide more RBSP data in PPS, skipping\n");
726 return 0;
727 }
728
729 return 1;
730}
731
732int ff_h264_decode_picture_parameter_set(GetBitContext *gb, AVCodecContext *avctx,
733 H264ParamSets *ps, int bit_length)
734{
735 AVBufferRef *pps_buf;
736 const SPS *sps;
737 unsigned int pps_id = get_ue_golomb(gb);
738 PPS *pps;
739 int qp_bd_offset;
740 int bits_left;
741 int ret;
742
743 if (pps_id >= MAX_PPS_COUNT) {
744 av_log(avctx, AV_LOG_ERROR, "pps_id %u out of range\n", pps_id);
745 return AVERROR_INVALIDDATA;
746 }
747
748 pps_buf = av_buffer_allocz(sizeof(*pps));
749 if (!pps_buf)
750 return AVERROR(ENOMEM);
751 pps = (PPS*)pps_buf->data;
752
753 pps->data_size = gb->buffer_end - gb->buffer;
754 if (pps->data_size > sizeof(pps->data)) {
755 av_log(avctx, AV_LOG_WARNING, "Truncating likely oversized PPS "
756 "(%"SIZE_SPECIFIER" > %"SIZE_SPECIFIER")\n",
757 pps->data_size, sizeof(pps->data));
758 pps->data_size = sizeof(pps->data);
759 }
760 memcpy(pps->data, gb->buffer, pps->data_size);
761
762 pps->sps_id = get_ue_golomb_31(gb);
763 if ((unsigned)pps->sps_id >= MAX_SPS_COUNT ||
764 !ps->sps_list[pps->sps_id]) {
765 av_log(avctx, AV_LOG_ERROR, "sps_id %u out of range\n", pps->sps_id);
766 ret = AVERROR_INVALIDDATA;
767 goto fail;
768 }
769 sps = (const SPS*)ps->sps_list[pps->sps_id]->data;
770 if (sps->bit_depth_luma > 14) {
771 av_log(avctx, AV_LOG_ERROR,
772 "Invalid luma bit depth=%d\n",
773 sps->bit_depth_luma);
774 ret = AVERROR_INVALIDDATA;
775 goto fail;
776 } else if (sps->bit_depth_luma == 11 || sps->bit_depth_luma == 13) {
777 avpriv_report_missing_feature(avctx,
778 "Unimplemented luma bit depth=%d",
779 sps->bit_depth_luma);
780 ret = AVERROR_PATCHWELCOME;
781 goto fail;
782 }
783
784 pps->cabac = get_bits1(gb);
785 pps->pic_order_present = get_bits1(gb);
786 pps->slice_group_count = get_ue_golomb(gb) + 1;
787 if (pps->slice_group_count > 1) {
788 pps->mb_slice_group_map_type = get_ue_golomb(gb);
789 av_log(avctx, AV_LOG_ERROR, "FMO not supported\n");
790 }
791 pps->ref_count[0] = get_ue_golomb(gb) + 1;
792 pps->ref_count[1] = get_ue_golomb(gb) + 1;
793 if (pps->ref_count[0] - 1 > 32 - 1 || pps->ref_count[1] - 1 > 32 - 1) {
794 av_log(avctx, AV_LOG_ERROR, "reference overflow (pps)\n");
795 ret = AVERROR_INVALIDDATA;
796 goto fail;
797 }
798
799 qp_bd_offset = 6 * (sps->bit_depth_luma - 8);
800
801 pps->weighted_pred = get_bits1(gb);
802 pps->weighted_bipred_idc = get_bits(gb, 2);
803 pps->init_qp = get_se_golomb(gb) + 26U + qp_bd_offset;
804 pps->init_qs = get_se_golomb(gb) + 26U + qp_bd_offset;
805 pps->chroma_qp_index_offset[0] = get_se_golomb(gb);
806 if (pps->chroma_qp_index_offset[0] < -12 || pps->chroma_qp_index_offset[0] > 12) {
807 ret = AVERROR_INVALIDDATA;
808 goto fail;
809 }
810
811 pps->deblocking_filter_parameters_present = get_bits1(gb);
812 pps->constrained_intra_pred = get_bits1(gb);
813 pps->redundant_pic_cnt_present = get_bits1(gb);
814
815 pps->transform_8x8_mode = 0;
816 memcpy(pps->scaling_matrix4, sps->scaling_matrix4,
817 sizeof(pps->scaling_matrix4));
818 memcpy(pps->scaling_matrix8, sps->scaling_matrix8,
819 sizeof(pps->scaling_matrix8));
820
821 bits_left = bit_length - get_bits_count(gb);
822 if (bits_left > 0 && more_rbsp_data_in_pps(sps, avctx)) {
823 pps->transform_8x8_mode = get_bits1(gb);
824 ret = decode_scaling_matrices(gb, sps, pps, 0,
825 pps->scaling_matrix4, pps->scaling_matrix8);
826 if (ret < 0)
827 goto fail;
828 // second_chroma_qp_index_offset
829 pps->chroma_qp_index_offset[1] = get_se_golomb(gb);
830 if (pps->chroma_qp_index_offset[1] < -12 || pps->chroma_qp_index_offset[1] > 12) {
831 ret = AVERROR_INVALIDDATA;
832 goto fail;
833 }
834 } else {
835 pps->chroma_qp_index_offset[1] = pps->chroma_qp_index_offset[0];
836 }
837
838 build_qp_table(pps, 0, pps->chroma_qp_index_offset[0],
839 sps->bit_depth_luma);
840 build_qp_table(pps, 1, pps->chroma_qp_index_offset[1],
841 sps->bit_depth_luma);
842
843 init_dequant_tables(pps, sps);
844
845 if (pps->chroma_qp_index_offset[0] != pps->chroma_qp_index_offset[1])
846 pps->chroma_qp_diff = 1;
847
848 if (avctx->debug & FF_DEBUG_PICT_INFO) {
849 av_log(avctx, AV_LOG_DEBUG,
850 "pps:%u sps:%u %s slice_groups:%d ref:%u/%u %s qp:%d/%d/%d/%d %s %s %s %s\n",
851 pps_id, pps->sps_id,
852 pps->cabac ? "CABAC" : "CAVLC",
853 pps->slice_group_count,
854 pps->ref_count[0], pps->ref_count[1],
855 pps->weighted_pred ? "weighted" : "",
856 pps->init_qp, pps->init_qs, pps->chroma_qp_index_offset[0], pps->chroma_qp_index_offset[1],
857 pps->deblocking_filter_parameters_present ? "LPAR" : "",
858 pps->constrained_intra_pred ? "CONSTR" : "",
859 pps->redundant_pic_cnt_present ? "REDU" : "",
860 pps->transform_8x8_mode ? "8x8DCT" : "");
861 }
862
863 remove_pps(ps, pps_id);
864 ps->pps_list[pps_id] = pps_buf;
865
866 return 0;
867
868fail:
869 av_buffer_unref(&pps_buf);
870 return ret;
871}
872
generated by cgit at 2024-05-17 04:46:34 (GMT)