4a56c738bff03574f6ce492a6a40aced1dd0931a
[libav.git] / libavcodec / h264_ps.c
1 /*
2 * H.26L/H.264/AVC/JVT/14496-10/... parameter set decoding
3 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
4 *
5 * This file is part of Libav.
6 *
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * H.264 / AVC / 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
43 static const AVRational pixel_aspect[17] = {
44 { 0, 1 },
45 { 1, 1 },
46 { 12, 11 },
47 { 10, 11 },
48 { 16, 11 },
49 { 40, 33 },
50 { 24, 11 },
51 { 20, 11 },
52 { 32, 11 },
53 { 80, 33 },
54 { 18, 11 },
55 { 15, 11 },
56 { 64, 33 },
57 { 160, 99 },
58 { 4, 3 },
59 { 3, 2 },
60 { 2, 1 },
61 };
62
63 static const uint8_t default_scaling4[2][16] = {
64 { 6, 13, 20, 28, 13, 20, 28, 32,
65 20, 28, 32, 37, 28, 32, 37, 42 },
66 { 10, 14, 20, 24, 14, 20, 24, 27,
67 20, 24, 27, 30, 24, 27, 30, 34 }
68 };
69
70 static const uint8_t default_scaling8[2][64] = {
71 { 6, 10, 13, 16, 18, 23, 25, 27,
72 10, 11, 16, 18, 23, 25, 27, 29,
73 13, 16, 18, 23, 25, 27, 29, 31,
74 16, 18, 23, 25, 27, 29, 31, 33,
75 18, 23, 25, 27, 29, 31, 33, 36,
76 23, 25, 27, 29, 31, 33, 36, 38,
77 25, 27, 29, 31, 33, 36, 38, 40,
78 27, 29, 31, 33, 36, 38, 40, 42 },
79 { 9, 13, 15, 17, 19, 21, 22, 24,
80 13, 13, 17, 19, 21, 22, 24, 25,
81 15, 17, 19, 21, 22, 24, 25, 27,
82 17, 19, 21, 22, 24, 25, 27, 28,
83 19, 21, 22, 24, 25, 27, 28, 30,
84 21, 22, 24, 25, 27, 28, 30, 32,
85 22, 24, 25, 27, 28, 30, 32, 33,
86 24, 25, 27, 28, 30, 32, 33, 35 }
87 };
88
89 /* maximum number of MBs in the DPB for a given level */
90 static const int level_max_dpb_mbs[][2] = {
91 { 10, 396 },
92 { 11, 900 },
93 { 12, 2376 },
94 { 13, 2376 },
95 { 20, 2376 },
96 { 21, 4752 },
97 { 22, 8100 },
98 { 30, 8100 },
99 { 31, 18000 },
100 { 32, 20480 },
101 { 40, 32768 },
102 { 41, 32768 },
103 { 42, 34816 },
104 { 50, 110400 },
105 { 51, 184320 },
106 { 52, 184320 },
107 };
108
109 static void remove_pps(H264ParamSets *s, int id)
110 {
111 if (s->pps_list[id] && s->pps == (const PPS*)s->pps_list[id]->data)
112 s->pps = NULL;
113 av_buffer_unref(&s->pps_list[id]);
114 }
115
116 static void remove_sps(H264ParamSets *s, int id)
117 {
118 int i;
119 if (s->sps_list[id]) {
120 if (s->sps == (SPS*)s->sps_list[id]->data)
121 s->sps = NULL;
122
123 /* drop all PPS that depend on this SPS */
124 for (i = 0; i < FF_ARRAY_ELEMS(s->pps_list); i++)
125 if (s->pps_list[i] && ((PPS*)s->pps_list[i]->data)->sps_id == id)
126 remove_pps(s, i);
127 }
128 av_buffer_unref(&s->sps_list[id]);
129 }
130
131 static inline int decode_hrd_parameters(GetBitContext *gb, AVCodecContext *avctx,
132 SPS *sps)
133 {
134 int cpb_count, i;
135 cpb_count = get_ue_golomb_31(gb) + 1;
136
137 if (cpb_count > 32U) {
138 av_log(avctx, AV_LOG_ERROR, "cpb_count %d invalid\n", cpb_count);
139 return AVERROR_INVALIDDATA;
140 }
141
142 get_bits(gb, 4); /* bit_rate_scale */
143 get_bits(gb, 4); /* cpb_size_scale */
144 for (i = 0; i < cpb_count; i++) {
145 get_ue_golomb_long(gb); /* bit_rate_value_minus1 */
146 get_ue_golomb_long(gb); /* cpb_size_value_minus1 */
147 get_bits1(gb); /* cbr_flag */
148 }
149 sps->initial_cpb_removal_delay_length = get_bits(gb, 5) + 1;
150 sps->cpb_removal_delay_length = get_bits(gb, 5) + 1;
151 sps->dpb_output_delay_length = get_bits(gb, 5) + 1;
152 sps->time_offset_length = get_bits(gb, 5);
153 sps->cpb_cnt = cpb_count;
154 return 0;
155 }
156
157 static inline int decode_vui_parameters(GetBitContext *gb, AVCodecContext *avctx,
158 SPS *sps)
159 {
160 int aspect_ratio_info_present_flag;
161 unsigned int aspect_ratio_idc;
162
163 aspect_ratio_info_present_flag = get_bits1(gb);
164
165 if (aspect_ratio_info_present_flag) {
166 aspect_ratio_idc = get_bits(gb, 8);
167 if (aspect_ratio_idc == EXTENDED_SAR) {
168 sps->sar.num = get_bits(gb, 16);
169 sps->sar.den = get_bits(gb, 16);
170 } else if (aspect_ratio_idc < FF_ARRAY_ELEMS(pixel_aspect)) {
171 sps->sar = pixel_aspect[aspect_ratio_idc];
172 } else {
173 av_log(avctx, AV_LOG_ERROR, "illegal aspect ratio\n");
174 return AVERROR_INVALIDDATA;
175 }
176 } else {
177 sps->sar.num =
178 sps->sar.den = 0;
179 }
180
181 if (get_bits1(gb)) /* overscan_info_present_flag */
182 get_bits1(gb); /* overscan_appropriate_flag */
183
184 sps->video_signal_type_present_flag = get_bits1(gb);
185 if (sps->video_signal_type_present_flag) {
186 get_bits(gb, 3); /* video_format */
187 sps->full_range = get_bits1(gb); /* video_full_range_flag */
188
189 sps->colour_description_present_flag = get_bits1(gb);
190 if (sps->colour_description_present_flag) {
191 sps->color_primaries = get_bits(gb, 8); /* colour_primaries */
192 sps->color_trc = get_bits(gb, 8); /* transfer_characteristics */
193 sps->colorspace = get_bits(gb, 8); /* matrix_coefficients */
194 if (sps->color_primaries >= AVCOL_PRI_NB)
195 sps->color_primaries = AVCOL_PRI_UNSPECIFIED;
196 if (sps->color_trc >= AVCOL_TRC_NB)
197 sps->color_trc = AVCOL_TRC_UNSPECIFIED;
198 if (sps->colorspace >= AVCOL_SPC_NB)
199 sps->colorspace = AVCOL_SPC_UNSPECIFIED;
200 }
201 }
202
203 /* chroma_location_info_present_flag */
204 if (get_bits1(gb)) {
205 /* chroma_sample_location_type_top_field */
206 avctx->chroma_sample_location = get_ue_golomb(gb) + 1;
207 get_ue_golomb(gb); /* chroma_sample_location_type_bottom_field */
208 }
209
210 sps->timing_info_present_flag = get_bits1(gb);
211 if (sps->timing_info_present_flag) {
212 sps->num_units_in_tick = get_bits_long(gb, 32);
213 sps->time_scale = get_bits_long(gb, 32);
214 if (!sps->num_units_in_tick || !sps->time_scale) {
215 av_log(avctx, AV_LOG_ERROR,
216 "time_scale/num_units_in_tick invalid or unsupported (%"PRIu32"/%"PRIu32")\n",
217 sps->time_scale, sps->num_units_in_tick);
218 return AVERROR_INVALIDDATA;
219 }
220 sps->fixed_frame_rate_flag = get_bits1(gb);
221 }
222
223 sps->nal_hrd_parameters_present_flag = get_bits1(gb);
224 if (sps->nal_hrd_parameters_present_flag)
225 if (decode_hrd_parameters(gb, avctx, sps) < 0)
226 return AVERROR_INVALIDDATA;
227 sps->vcl_hrd_parameters_present_flag = get_bits1(gb);
228 if (sps->vcl_hrd_parameters_present_flag)
229 if (decode_hrd_parameters(gb, avctx, sps) < 0)
230 return AVERROR_INVALIDDATA;
231 if (sps->nal_hrd_parameters_present_flag ||
232 sps->vcl_hrd_parameters_present_flag)
233 get_bits1(gb); /* low_delay_hrd_flag */
234 sps->pic_struct_present_flag = get_bits1(gb);
235
236 sps->bitstream_restriction_flag = get_bits1(gb);
237 if (sps->bitstream_restriction_flag) {
238 get_bits1(gb); /* motion_vectors_over_pic_boundaries_flag */
239 get_ue_golomb(gb); /* max_bytes_per_pic_denom */
240 get_ue_golomb(gb); /* max_bits_per_mb_denom */
241 get_ue_golomb(gb); /* log2_max_mv_length_horizontal */
242 get_ue_golomb(gb); /* log2_max_mv_length_vertical */
243 sps->num_reorder_frames = get_ue_golomb(gb);
244 get_ue_golomb(gb); /*max_dec_frame_buffering*/
245
246 if (get_bits_left(gb) < 0) {
247 sps->num_reorder_frames = 0;
248 sps->bitstream_restriction_flag = 0;
249 }
250
251 if (sps->num_reorder_frames > 16U
252 /* max_dec_frame_buffering || max_dec_frame_buffering > 16 */) {
253 av_log(avctx, AV_LOG_ERROR,
254 "Clipping illegal num_reorder_frames %d\n",
255 sps->num_reorder_frames);
256 sps->num_reorder_frames = 16;
257 return AVERROR_INVALIDDATA;
258 }
259 }
260 if (get_bits_left(gb) < 0) {
261 av_log(avctx, AV_LOG_ERROR,
262 "Overread VUI by %d bits\n", -get_bits_left(gb));
263 return AVERROR_INVALIDDATA;
264 }
265
266 return 0;
267 }
268
269 static void decode_scaling_list(GetBitContext *gb, uint8_t *factors, int size,
270 const uint8_t *jvt_list,
271 const uint8_t *fallback_list)
272 {
273 int i, last = 8, next = 8;
274 const uint8_t *scan = size == 16 ? ff_zigzag_scan : ff_zigzag_direct;
275 if (!get_bits1(gb)) /* matrix not written, we use the predicted one */
276 memcpy(factors, fallback_list, size * sizeof(uint8_t));
277 else
278 for (i = 0; i < size; i++) {
279 if (next)
280 next = (last + get_se_golomb(gb)) & 0xff;
281 if (!i && !next) { /* matrix not written, we use the preset one */
282 memcpy(factors, jvt_list, size * sizeof(uint8_t));
283 break;
284 }
285 last = factors[scan[i]] = next ? next : last;
286 }
287 }
288
289 static void decode_scaling_matrices(GetBitContext *gb, SPS *sps,
290 PPS *pps, int is_sps,
291 uint8_t(*scaling_matrix4)[16],
292 uint8_t(*scaling_matrix8)[64])
293 {
294 int fallback_sps = !is_sps && sps->scaling_matrix_present;
295 const uint8_t *fallback[4] = {
296 fallback_sps ? sps->scaling_matrix4[0] : default_scaling4[0],
297 fallback_sps ? sps->scaling_matrix4[3] : default_scaling4[1],
298 fallback_sps ? sps->scaling_matrix8[0] : default_scaling8[0],
299 fallback_sps ? sps->scaling_matrix8[3] : default_scaling8[1]
300 };
301 if (get_bits1(gb)) {
302 sps->scaling_matrix_present |= is_sps;
303 decode_scaling_list(gb, scaling_matrix4[0], 16, default_scaling4[0], fallback[0]); // Intra, Y
304 decode_scaling_list(gb, scaling_matrix4[1], 16, default_scaling4[0], scaling_matrix4[0]); // Intra, Cr
305 decode_scaling_list(gb, scaling_matrix4[2], 16, default_scaling4[0], scaling_matrix4[1]); // Intra, Cb
306 decode_scaling_list(gb, scaling_matrix4[3], 16, default_scaling4[1], fallback[1]); // Inter, Y
307 decode_scaling_list(gb, scaling_matrix4[4], 16, default_scaling4[1], scaling_matrix4[3]); // Inter, Cr
308 decode_scaling_list(gb, scaling_matrix4[5], 16, default_scaling4[1], scaling_matrix4[4]); // Inter, Cb
309 if (is_sps || pps->transform_8x8_mode) {
310 decode_scaling_list(gb, scaling_matrix8[0], 64, default_scaling8[0], fallback[2]); // Intra, Y
311 if (sps->chroma_format_idc == 3) {
312 decode_scaling_list(gb, scaling_matrix8[1], 64, default_scaling8[0], scaling_matrix8[0]); // Intra, Cr
313 decode_scaling_list(gb, scaling_matrix8[2], 64, default_scaling8[0], scaling_matrix8[1]); // Intra, Cb
314 }
315 decode_scaling_list(gb, scaling_matrix8[3], 64, default_scaling8[1], fallback[3]); // Inter, Y
316 if (sps->chroma_format_idc == 3) {
317 decode_scaling_list(gb, scaling_matrix8[4], 64, default_scaling8[1], scaling_matrix8[3]); // Inter, Cr
318 decode_scaling_list(gb, scaling_matrix8[5], 64, default_scaling8[1], scaling_matrix8[4]); // Inter, Cb
319 }
320 }
321 }
322 }
323
324 int ff_h264_decode_seq_parameter_set(GetBitContext *gb, AVCodecContext *avctx,
325 H264ParamSets *ps)
326 {
327 AVBufferRef *sps_buf;
328 int profile_idc, level_idc, constraint_set_flags = 0;
329 unsigned int sps_id;
330 int i, log2_max_frame_num_minus4;
331 SPS *sps;
332
333 profile_idc = get_bits(gb, 8);
334 constraint_set_flags |= get_bits1(gb) << 0; // constraint_set0_flag
335 constraint_set_flags |= get_bits1(gb) << 1; // constraint_set1_flag
336 constraint_set_flags |= get_bits1(gb) << 2; // constraint_set2_flag
337 constraint_set_flags |= get_bits1(gb) << 3; // constraint_set3_flag
338 constraint_set_flags |= get_bits1(gb) << 4; // constraint_set4_flag
339 constraint_set_flags |= get_bits1(gb) << 5; // constraint_set5_flag
340 skip_bits(gb, 2); // reserved_zero_2bits
341 level_idc = get_bits(gb, 8);
342 sps_id = get_ue_golomb_31(gb);
343
344 if (sps_id >= MAX_SPS_COUNT) {
345 av_log(avctx, AV_LOG_ERROR, "sps_id %u out of range\n", sps_id);
346 return AVERROR_INVALIDDATA;
347 }
348
349 sps_buf = av_buffer_allocz(sizeof(*sps));
350 if (!sps_buf)
351 return AVERROR(ENOMEM);
352 sps = (SPS*)sps_buf->data;
353
354 sps->sps_id = sps_id;
355 sps->time_offset_length = 24;
356 sps->profile_idc = profile_idc;
357 sps->constraint_set_flags = constraint_set_flags;
358 sps->level_idc = level_idc;
359
360 memset(sps->scaling_matrix4, 16, sizeof(sps->scaling_matrix4));
361 memset(sps->scaling_matrix8, 16, sizeof(sps->scaling_matrix8));
362 sps->scaling_matrix_present = 0;
363
364 if (sps->profile_idc == 100 || // High profile
365 sps->profile_idc == 110 || // High10 profile
366 sps->profile_idc == 122 || // High422 profile
367 sps->profile_idc == 244 || // High444 Predictive profile
368 sps->profile_idc == 44 || // Cavlc444 profile
369 sps->profile_idc == 83 || // Scalable Constrained High profile (SVC)
370 sps->profile_idc == 86 || // Scalable High Intra profile (SVC)
371 sps->profile_idc == 118 || // Stereo High profile (MVC)
372 sps->profile_idc == 128 || // Multiview High profile (MVC)
373 sps->profile_idc == 138 || // Multiview Depth High profile (MVCD)
374 sps->profile_idc == 144) { // old High444 profile
375 sps->chroma_format_idc = get_ue_golomb_31(gb);
376 if (sps->chroma_format_idc > 3) {
377 avpriv_request_sample(avctx, "chroma_format_idc %u",
378 sps->chroma_format_idc);
379 goto fail;
380 } else if (sps->chroma_format_idc == 3) {
381 sps->residual_color_transform_flag = get_bits1(gb);
382 }
383 sps->bit_depth_luma = get_ue_golomb(gb) + 8;
384 sps->bit_depth_chroma = get_ue_golomb(gb) + 8;
385 if (sps->bit_depth_chroma != sps->bit_depth_luma) {
386 avpriv_request_sample(avctx,
387 "Different chroma and luma bit depth");
388 goto fail;
389 }
390 sps->transform_bypass = get_bits1(gb);
391 decode_scaling_matrices(gb, sps, NULL, 1,
392 sps->scaling_matrix4, sps->scaling_matrix8);
393 } else {
394 sps->chroma_format_idc = 1;
395 sps->bit_depth_luma = 8;
396 sps->bit_depth_chroma = 8;
397 }
398
399 log2_max_frame_num_minus4 = get_ue_golomb(gb);
400 if (log2_max_frame_num_minus4 < MIN_LOG2_MAX_FRAME_NUM - 4 ||
401 log2_max_frame_num_minus4 > MAX_LOG2_MAX_FRAME_NUM - 4) {
402 av_log(avctx, AV_LOG_ERROR,
403 "log2_max_frame_num_minus4 out of range (0-12): %d\n",
404 log2_max_frame_num_minus4);
405 goto fail;
406 }
407 sps->log2_max_frame_num = log2_max_frame_num_minus4 + 4;
408
409 sps->poc_type = get_ue_golomb_31(gb);
410
411 if (sps->poc_type == 0) { // FIXME #define
412 sps->log2_max_poc_lsb = get_ue_golomb(gb) + 4;
413 } else if (sps->poc_type == 1) { // FIXME #define
414 sps->delta_pic_order_always_zero_flag = get_bits1(gb);
415 sps->offset_for_non_ref_pic = get_se_golomb(gb);
416 sps->offset_for_top_to_bottom_field = get_se_golomb(gb);
417 sps->poc_cycle_length = get_ue_golomb(gb);
418
419 if ((unsigned)sps->poc_cycle_length >=
420 FF_ARRAY_ELEMS(sps->offset_for_ref_frame)) {
421 av_log(avctx, AV_LOG_ERROR,
422 "poc_cycle_length overflow %d\n", sps->poc_cycle_length);
423 goto fail;
424 }
425
426 for (i = 0; i < sps->poc_cycle_length; i++)
427 sps->offset_for_ref_frame[i] = get_se_golomb(gb);
428 } else if (sps->poc_type != 2) {
429 av_log(avctx, AV_LOG_ERROR, "illegal POC type %d\n", sps->poc_type);
430 goto fail;
431 }
432
433 sps->ref_frame_count = get_ue_golomb_31(gb);
434 if (sps->ref_frame_count > MAX_DELAYED_PIC_COUNT) {
435 av_log(avctx, AV_LOG_ERROR,
436 "too many reference frames %d\n", sps->ref_frame_count);
437 goto fail;
438 }
439 sps->gaps_in_frame_num_allowed_flag = get_bits1(gb);
440 sps->mb_width = get_ue_golomb(gb) + 1;
441 sps->mb_height = get_ue_golomb(gb) + 1;
442 if ((unsigned)sps->mb_width >= INT_MAX / 16 ||
443 (unsigned)sps->mb_height >= INT_MAX / 16 ||
444 av_image_check_size(16 * sps->mb_width,
445 16 * sps->mb_height, 0, avctx)) {
446 av_log(avctx, AV_LOG_ERROR, "mb_width/height overflow\n");
447 goto fail;
448 }
449
450 sps->frame_mbs_only_flag = get_bits1(gb);
451 if (!sps->frame_mbs_only_flag)
452 sps->mb_aff = get_bits1(gb);
453 else
454 sps->mb_aff = 0;
455
456 sps->direct_8x8_inference_flag = get_bits1(gb);
457 if (!sps->frame_mbs_only_flag && !sps->direct_8x8_inference_flag) {
458 av_log(avctx, AV_LOG_ERROR,
459 "This stream was generated by a broken encoder, invalid 8x8 inference\n");
460 goto fail;
461 }
462
463 #ifndef ALLOW_INTERLACE
464 if (sps->mb_aff)
465 av_log(avctx, AV_LOG_ERROR,
466 "MBAFF support not included; enable it at compile-time.\n");
467 #endif
468 sps->crop = get_bits1(gb);
469 if (sps->crop) {
470 unsigned int crop_left = get_ue_golomb(gb);
471 unsigned int crop_right = get_ue_golomb(gb);
472 unsigned int crop_top = get_ue_golomb(gb);
473 unsigned int crop_bottom = get_ue_golomb(gb);
474
475 if (avctx->flags2 & AV_CODEC_FLAG2_IGNORE_CROP) {
476 av_log(avctx, AV_LOG_DEBUG, "discarding sps cropping, original "
477 "values are l:%d r:%d t:%d b:%d\n",
478 crop_left, crop_right, crop_top, crop_bottom);
479
480 sps->crop_left =
481 sps->crop_right =
482 sps->crop_top =
483 sps->crop_bottom = 0;
484 } else {
485 int vsub = (sps->chroma_format_idc == 1) ? 1 : 0;
486 int hsub = (sps->chroma_format_idc == 1 ||
487 sps->chroma_format_idc == 2) ? 1 : 0;
488 int step_x = 1 << hsub;
489 int step_y = (2 - sps->frame_mbs_only_flag) << vsub;
490
491 if (crop_left & (0x1F >> (sps->bit_depth_luma > 8)) &&
492 !(avctx->flags & AV_CODEC_FLAG_UNALIGNED)) {
493 crop_left &= ~(0x1F >> (sps->bit_depth_luma > 8));
494 av_log(avctx, AV_LOG_WARNING,
495 "Reducing left cropping to %d "
496 "chroma samples to preserve alignment.\n",
497 crop_left);
498 }
499
500 if (INT_MAX / step_x <= crop_left ||
501 INT_MAX / step_x - crop_left <= crop_right ||
502 16 * sps->mb_width <= step_x * (crop_left + crop_right) ||
503 INT_MAX / step_y <= crop_top ||
504 INT_MAX / step_y - crop_top <= crop_bottom ||
505 16 * sps->mb_height <= step_y * (crop_top + crop_bottom)) {
506 av_log(avctx, AV_LOG_WARNING, "Invalid crop parameters\n");
507 if (avctx->err_recognition & AV_EF_EXPLODE)
508 goto fail;
509 crop_left = crop_right = crop_top = crop_bottom = 0;
510 }
511
512 sps->crop_left = crop_left * step_x;
513 sps->crop_right = crop_right * step_x;
514 sps->crop_top = crop_top * step_y;
515 sps->crop_bottom = crop_bottom * step_y;
516 }
517 } else {
518 sps->crop_left =
519 sps->crop_right =
520 sps->crop_top =
521 sps->crop_bottom =
522 sps->crop = 0;
523 }
524
525 sps->vui_parameters_present_flag = get_bits1(gb);
526 if (sps->vui_parameters_present_flag) {
527 int ret = decode_vui_parameters(gb, avctx, sps);
528 if (ret < 0 && avctx->err_recognition & AV_EF_EXPLODE)
529 goto fail;
530 }
531
532 /* if the maximum delay is not stored in the SPS, derive it based on the
533 * level */
534 if (!sps->bitstream_restriction_flag &&
535 (sps->ref_frame_count || avctx->strict_std_compliance >= FF_COMPLIANCE_STRICT)) {
536 sps->num_reorder_frames = MAX_DELAYED_PIC_COUNT - 1;
537 for (i = 0; i < FF_ARRAY_ELEMS(level_max_dpb_mbs); i++) {
538 if (level_max_dpb_mbs[i][0] == sps->level_idc) {
539 sps->num_reorder_frames = FFMIN(level_max_dpb_mbs[i][1] / (sps->mb_width * sps->mb_height),
540 sps->num_reorder_frames);
541 break;
542 }
543 }
544 }
545
546 if (!sps->sar.den)
547 sps->sar.den = 1;
548
549 if (avctx->debug & FF_DEBUG_PICT_INFO) {
550 static const char csp[4][5] = { "Gray", "420", "422", "444" };
551 av_log(avctx, AV_LOG_DEBUG,
552 "sps:%u profile:%d/%d poc:%d ref:%d %dx%d %s %s crop:%u/%u/%u/%u %s %s %"PRId32"/%"PRId32"\n",
553 sps_id, sps->profile_idc, sps->level_idc,
554 sps->poc_type,
555 sps->ref_frame_count,
556 sps->mb_width, sps->mb_height,
557 sps->frame_mbs_only_flag ? "FRM" : (sps->mb_aff ? "MB-AFF" : "PIC-AFF"),
558 sps->direct_8x8_inference_flag ? "8B8" : "",
559 sps->crop_left, sps->crop_right,
560 sps->crop_top, sps->crop_bottom,
561 sps->vui_parameters_present_flag ? "VUI" : "",
562 csp[sps->chroma_format_idc],
563 sps->timing_info_present_flag ? sps->num_units_in_tick : 0,
564 sps->timing_info_present_flag ? sps->time_scale : 0);
565 }
566
567 /* check if this is a repeat of an already parsed SPS, then keep the
568 * original one.
569 * otherwise drop all PPSes that depend on it */
570 if (ps->sps_list[sps_id] &&
571 !memcmp(ps->sps_list[sps_id]->data, sps_buf->data, sps_buf->size)) {
572 av_buffer_unref(&sps_buf);
573 } else {
574 remove_sps(ps, sps_id);
575 ps->sps_list[sps_id] = sps_buf;
576 }
577
578 return 0;
579
580 fail:
581 av_buffer_unref(&sps_buf);
582 return AVERROR_INVALIDDATA;
583 }
584
585 static void init_dequant8_coeff_table(PPS *pps, const SPS *sps)
586 {
587 int i, j, q, x;
588 const int max_qp = 51 + 6 * (sps->bit_depth_luma - 8);
589
590 for (i = 0; i < 6; i++) {
591 pps->dequant8_coeff[i] = pps->dequant8_buffer[i];
592 for (j = 0; j < i; j++)
593 if (!memcmp(pps->scaling_matrix8[j], pps->scaling_matrix8[i],
594 64 * sizeof(uint8_t))) {
595 pps->dequant8_coeff[i] = pps->dequant8_buffer[j];
596 break;
597 }
598 if (j < i)
599 continue;
600
601 for (q = 0; q < max_qp + 1; q++) {
602 int shift = ff_h264_quant_div6[q];
603 int idx = ff_h264_quant_rem6[q];
604 for (x = 0; x < 64; x++)
605 pps->dequant8_coeff[i][q][(x >> 3) | ((x & 7) << 3)] =
606 ((uint32_t)ff_h264_dequant8_coeff_init[idx][ff_h264_dequant8_coeff_init_scan[((x >> 1) & 12) | (x & 3)]] *
607 pps->scaling_matrix8[i][x]) << shift;
608 }
609 }
610 }
611
612 static void init_dequant4_coeff_table(PPS *pps, const SPS *sps)
613 {
614 int i, j, q, x;
615 const int max_qp = 51 + 6 * (sps->bit_depth_luma - 8);
616 for (i = 0; i < 6; i++) {
617 pps->dequant4_coeff[i] = pps->dequant4_buffer[i];
618 for (j = 0; j < i; j++)
619 if (!memcmp(pps->scaling_matrix4[j], pps->scaling_matrix4[i],
620 16 * sizeof(uint8_t))) {
621 pps->dequant4_coeff[i] = pps->dequant4_buffer[j];
622 break;
623 }
624 if (j < i)
625 continue;
626
627 for (q = 0; q < max_qp + 1; q++) {
628 int shift = ff_h264_quant_div6[q] + 2;
629 int idx = ff_h264_quant_rem6[q];
630 for (x = 0; x < 16; x++)
631 pps->dequant4_coeff[i][q][(x >> 2) | ((x << 2) & 0xF)] =
632 ((uint32_t)ff_h264_dequant4_coeff_init[idx][(x & 1) + ((x >> 2) & 1)] *
633 pps->scaling_matrix4[i][x]) << shift;
634 }
635 }
636 }
637
638 static void init_dequant_tables(PPS *pps, const SPS *sps)
639 {
640 int i, x;
641 init_dequant4_coeff_table(pps, sps);
642 if (pps->transform_8x8_mode)
643 init_dequant8_coeff_table(pps, sps);
644 if (sps->transform_bypass) {
645 for (i = 0; i < 6; i++)
646 for (x = 0; x < 16; x++)
647 pps->dequant4_coeff[i][0][x] = 1 << 6;
648 if (pps->transform_8x8_mode)
649 for (i = 0; i < 6; i++)
650 for (x = 0; x < 64; x++)
651 pps->dequant8_coeff[i][0][x] = 1 << 6;
652 }
653 }
654
655 static void build_qp_table(PPS *pps, int t, int index, const int depth)
656 {
657 int i;
658 const int max_qp = 51 + 6 * (depth - 8);
659 for (i = 0; i < max_qp + 1; i++)
660 pps->chroma_qp_table[t][i] =
661 ff_h264_chroma_qp[depth - 8][av_clip(i + index, 0, max_qp)];
662 }
663
664 int ff_h264_decode_picture_parameter_set(GetBitContext *gb, AVCodecContext *avctx,
665 H264ParamSets *ps, int bit_length)
666 {
667 AVBufferRef *pps_buf;
668 SPS *sps;
669 unsigned int pps_id = get_ue_golomb(gb);
670 PPS *pps;
671 int qp_bd_offset;
672 int bits_left;
673 int ret;
674
675 if (pps_id >= MAX_PPS_COUNT) {
676 av_log(avctx, AV_LOG_ERROR, "pps_id %u out of range\n", pps_id);
677 return AVERROR_INVALIDDATA;
678 }
679
680 pps_buf = av_buffer_allocz(sizeof(*pps));
681 if (!pps_buf)
682 return AVERROR(ENOMEM);
683 pps = (PPS*)pps_buf->data;
684
685 pps->sps_id = get_ue_golomb_31(gb);
686 if ((unsigned)pps->sps_id >= MAX_SPS_COUNT ||
687 !ps->sps_list[pps->sps_id]) {
688 av_log(avctx, AV_LOG_ERROR, "sps_id %u out of range\n", pps->sps_id);
689 ret = AVERROR_INVALIDDATA;
690 goto fail;
691 }
692 sps = (SPS*)ps->sps_list[pps->sps_id]->data;
693
694 if (sps->bit_depth_luma > 10) {
695 av_log(avctx, AV_LOG_ERROR,
696 "Unimplemented luma bit depth=%d (max=10)\n",
697 sps->bit_depth_luma);
698 ret = AVERROR_PATCHWELCOME;
699 goto fail;
700 }
701
702 pps->cabac = get_bits1(gb);
703 pps->pic_order_present = get_bits1(gb);
704 pps->slice_group_count = get_ue_golomb(gb) + 1;
705 if (pps->slice_group_count > 1) {
706 pps->mb_slice_group_map_type = get_ue_golomb(gb);
707 av_log(avctx, AV_LOG_ERROR, "FMO not supported\n");
708 switch (pps->mb_slice_group_map_type) {
709 case 0:
710 #if 0
711 | for (i = 0; i <= num_slice_groups_minus1; i++) | | |
712 | run_length[i] |1 |ue(v) |
713 #endif
714 break;
715 case 2:
716 #if 0
717 | for (i = 0; i < num_slice_groups_minus1; i++) { | | |
718 | top_left_mb[i] |1 |ue(v) |
719 | bottom_right_mb[i] |1 |ue(v) |
720 | } | | |
721 #endif
722 break;
723 case 3:
724 case 4:
725 case 5:
726 #if 0
727 | slice_group_change_direction_flag |1 |u(1) |
728 | slice_group_change_rate_minus1 |1 |ue(v) |
729 #endif
730 break;
731 case 6:
732 #if 0
733 | slice_group_id_cnt_minus1 |1 |ue(v) |
734 | for (i = 0; i <= slice_group_id_cnt_minus1; i++)| | |
735 | slice_group_id[i] |1 |u(v) |
736 #endif
737 break;
738 }
739 }
740 pps->ref_count[0] = get_ue_golomb(gb) + 1;
741 pps->ref_count[1] = get_ue_golomb(gb) + 1;
742 if (pps->ref_count[0] - 1 > 32 - 1 || pps->ref_count[1] - 1 > 32 - 1) {
743 av_log(avctx, AV_LOG_ERROR, "reference overflow (pps)\n");
744 ret = AVERROR_INVALIDDATA;
745 goto fail;
746 }
747
748 qp_bd_offset = 6 * (sps->bit_depth_luma - 8);
749
750 pps->weighted_pred = get_bits1(gb);
751 pps->weighted_bipred_idc = get_bits(gb, 2);
752 pps->init_qp = get_se_golomb(gb) + 26 + qp_bd_offset;
753 pps->init_qs = get_se_golomb(gb) + 26 + qp_bd_offset;
754 pps->chroma_qp_index_offset[0] = get_se_golomb(gb);
755 pps->deblocking_filter_parameters_present = get_bits1(gb);
756 pps->constrained_intra_pred = get_bits1(gb);
757 pps->redundant_pic_cnt_present = get_bits1(gb);
758
759 pps->transform_8x8_mode = 0;
760 memcpy(pps->scaling_matrix4, sps->scaling_matrix4,
761 sizeof(pps->scaling_matrix4));
762 memcpy(pps->scaling_matrix8, sps->scaling_matrix8,
763 sizeof(pps->scaling_matrix8));
764
765 bits_left = bit_length - get_bits_count(gb);
766 if (bits_left && (bits_left > 8 ||
767 show_bits(gb, bits_left) != 1 << (bits_left - 1))) {
768 pps->transform_8x8_mode = get_bits1(gb);
769 decode_scaling_matrices(gb, sps, pps, 0,
770 pps->scaling_matrix4, pps->scaling_matrix8);
771 // second_chroma_qp_index_offset
772 pps->chroma_qp_index_offset[1] = get_se_golomb(gb);
773 } else {
774 pps->chroma_qp_index_offset[1] = pps->chroma_qp_index_offset[0];
775 }
776
777 build_qp_table(pps, 0, pps->chroma_qp_index_offset[0],
778 sps->bit_depth_luma);
779 build_qp_table(pps, 1, pps->chroma_qp_index_offset[1],
780 sps->bit_depth_luma);
781
782 init_dequant_tables(pps, sps);
783
784 if (pps->chroma_qp_index_offset[0] != pps->chroma_qp_index_offset[1])
785 pps->chroma_qp_diff = 1;
786
787 if (avctx->debug & FF_DEBUG_PICT_INFO) {
788 av_log(avctx, AV_LOG_DEBUG,
789 "pps:%u sps:%u %s slice_groups:%d ref:%u/%u %s qp:%d/%d/%d/%d %s %s %s %s\n",
790 pps_id, pps->sps_id,
791 pps->cabac ? "CABAC" : "CAVLC",
792 pps->slice_group_count,
793 pps->ref_count[0], pps->ref_count[1],
794 pps->weighted_pred ? "weighted" : "",
795 pps->init_qp, pps->init_qs, pps->chroma_qp_index_offset[0], pps->chroma_qp_index_offset[1],
796 pps->deblocking_filter_parameters_present ? "LPAR" : "",
797 pps->constrained_intra_pred ? "CONSTR" : "",
798 pps->redundant_pic_cnt_present ? "REDU" : "",
799 pps->transform_8x8_mode ? "8x8DCT" : "");
800 }
801
802 remove_pps(ps, pps_id);
803 ps->pps_list[pps_id] = pps_buf;
804
805 return 0;
806
807 fail:
808 av_buffer_unref(&pps_buf);
809 return ret;
810 }