h264: reset num_reorder_frames if it is invalid
[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 / MPEG4 part10 parameter set decoding.
25 * @author Michael Niedermayer <michaelni@gmx.at>
26 */
27
28 #include "libavutil/imgutils.h"
29 #include "internal.h"
30 #include "avcodec.h"
31 #include "h264.h"
32 #include "h264data.h" //FIXME FIXME FIXME (just for zigzag_scan)
33 #include "golomb.h"
34
35 #define MAX_LOG2_MAX_FRAME_NUM (12 + 4)
36 #define MIN_LOG2_MAX_FRAME_NUM 4
37
38 static const AVRational pixel_aspect[17] = {
39 { 0, 1 },
40 { 1, 1 },
41 { 12, 11 },
42 { 10, 11 },
43 { 16, 11 },
44 { 40, 33 },
45 { 24, 11 },
46 { 20, 11 },
47 { 32, 11 },
48 { 80, 33 },
49 { 18, 11 },
50 { 15, 11 },
51 { 64, 33 },
52 { 160, 99 },
53 { 4, 3 },
54 { 3, 2 },
55 { 2, 1 },
56 };
57
58 #define QP(qP, depth) ((qP) + 6 * ((depth) - 8))
59
60 #define CHROMA_QP_TABLE_END(d) \
61 QP(0, d), QP(1, d), QP(2, d), QP(3, d), QP(4, d), QP(5, d), \
62 QP(6, d), QP(7, d), QP(8, d), QP(9, d), QP(10, d), QP(11, d), \
63 QP(12, d), QP(13, d), QP(14, d), QP(15, d), QP(16, d), QP(17, d), \
64 QP(18, d), QP(19, d), QP(20, d), QP(21, d), QP(22, d), QP(23, d), \
65 QP(24, d), QP(25, d), QP(26, d), QP(27, d), QP(28, d), QP(29, d), \
66 QP(29, d), QP(30, d), QP(31, d), QP(32, d), QP(32, d), QP(33, d), \
67 QP(34, d), QP(34, d), QP(35, d), QP(35, d), QP(36, d), QP(36, d), \
68 QP(37, d), QP(37, d), QP(37, d), QP(38, d), QP(38, d), QP(38, d), \
69 QP(39, d), QP(39, d), QP(39, d), QP(39, d)
70
71 const uint8_t ff_h264_chroma_qp[3][QP_MAX_NUM + 1] = {
72 { CHROMA_QP_TABLE_END(8) },
73 { 0, 1, 2, 3, 4, 5,
74 CHROMA_QP_TABLE_END(9) },
75 { 0, 1, 2, 3, 4, 5,
76 6, 7, 8, 9, 10, 11,
77 CHROMA_QP_TABLE_END(10) },
78 };
79
80 static const uint8_t default_scaling4[2][16] = {
81 { 6, 13, 20, 28, 13, 20, 28, 32,
82 20, 28, 32, 37, 28, 32, 37, 42 },
83 { 10, 14, 20, 24, 14, 20, 24, 27,
84 20, 24, 27, 30, 24, 27, 30, 34 }
85 };
86
87 static const uint8_t default_scaling8[2][64] = {
88 { 6, 10, 13, 16, 18, 23, 25, 27,
89 10, 11, 16, 18, 23, 25, 27, 29,
90 13, 16, 18, 23, 25, 27, 29, 31,
91 16, 18, 23, 25, 27, 29, 31, 33,
92 18, 23, 25, 27, 29, 31, 33, 36,
93 23, 25, 27, 29, 31, 33, 36, 38,
94 25, 27, 29, 31, 33, 36, 38, 40,
95 27, 29, 31, 33, 36, 38, 40, 42 },
96 { 9, 13, 15, 17, 19, 21, 22, 24,
97 13, 13, 17, 19, 21, 22, 24, 25,
98 15, 17, 19, 21, 22, 24, 25, 27,
99 17, 19, 21, 22, 24, 25, 27, 28,
100 19, 21, 22, 24, 25, 27, 28, 30,
101 21, 22, 24, 25, 27, 28, 30, 32,
102 22, 24, 25, 27, 28, 30, 32, 33,
103 24, 25, 27, 28, 30, 32, 33, 35 }
104 };
105
106 static inline int decode_hrd_parameters(H264Context *h, SPS *sps)
107 {
108 int cpb_count, i;
109 cpb_count = get_ue_golomb_31(&h->gb) + 1;
110
111 if (cpb_count > 32U) {
112 av_log(h->avctx, AV_LOG_ERROR, "cpb_count %d invalid\n", cpb_count);
113 return AVERROR_INVALIDDATA;
114 }
115
116 get_bits(&h->gb, 4); /* bit_rate_scale */
117 get_bits(&h->gb, 4); /* cpb_size_scale */
118 for (i = 0; i < cpb_count; i++) {
119 get_ue_golomb_long(&h->gb); /* bit_rate_value_minus1 */
120 get_ue_golomb_long(&h->gb); /* cpb_size_value_minus1 */
121 get_bits1(&h->gb); /* cbr_flag */
122 }
123 sps->initial_cpb_removal_delay_length = get_bits(&h->gb, 5) + 1;
124 sps->cpb_removal_delay_length = get_bits(&h->gb, 5) + 1;
125 sps->dpb_output_delay_length = get_bits(&h->gb, 5) + 1;
126 sps->time_offset_length = get_bits(&h->gb, 5);
127 sps->cpb_cnt = cpb_count;
128 return 0;
129 }
130
131 static inline int decode_vui_parameters(H264Context *h, SPS *sps)
132 {
133 int aspect_ratio_info_present_flag;
134 unsigned int aspect_ratio_idc;
135
136 aspect_ratio_info_present_flag = get_bits1(&h->gb);
137
138 if (aspect_ratio_info_present_flag) {
139 aspect_ratio_idc = get_bits(&h->gb, 8);
140 if (aspect_ratio_idc == EXTENDED_SAR) {
141 sps->sar.num = get_bits(&h->gb, 16);
142 sps->sar.den = get_bits(&h->gb, 16);
143 } else if (aspect_ratio_idc < FF_ARRAY_ELEMS(pixel_aspect)) {
144 sps->sar = pixel_aspect[aspect_ratio_idc];
145 } else {
146 av_log(h->avctx, AV_LOG_ERROR, "illegal aspect ratio\n");
147 return AVERROR_INVALIDDATA;
148 }
149 } else {
150 sps->sar.num =
151 sps->sar.den = 0;
152 }
153
154 if (get_bits1(&h->gb)) /* overscan_info_present_flag */
155 get_bits1(&h->gb); /* overscan_appropriate_flag */
156
157 sps->video_signal_type_present_flag = get_bits1(&h->gb);
158 if (sps->video_signal_type_present_flag) {
159 get_bits(&h->gb, 3); /* video_format */
160 sps->full_range = get_bits1(&h->gb); /* video_full_range_flag */
161
162 sps->colour_description_present_flag = get_bits1(&h->gb);
163 if (sps->colour_description_present_flag) {
164 sps->color_primaries = get_bits(&h->gb, 8); /* colour_primaries */
165 sps->color_trc = get_bits(&h->gb, 8); /* transfer_characteristics */
166 sps->colorspace = get_bits(&h->gb, 8); /* matrix_coefficients */
167 if (sps->color_primaries >= AVCOL_PRI_NB)
168 sps->color_primaries = AVCOL_PRI_UNSPECIFIED;
169 if (sps->color_trc >= AVCOL_TRC_NB)
170 sps->color_trc = AVCOL_TRC_UNSPECIFIED;
171 if (sps->colorspace >= AVCOL_SPC_NB)
172 sps->colorspace = AVCOL_SPC_UNSPECIFIED;
173 }
174 }
175
176 /* chroma_location_info_present_flag */
177 if (get_bits1(&h->gb)) {
178 /* chroma_sample_location_type_top_field */
179 h->avctx->chroma_sample_location = get_ue_golomb(&h->gb) + 1;
180 get_ue_golomb(&h->gb); /* chroma_sample_location_type_bottom_field */
181 }
182
183 sps->timing_info_present_flag = get_bits1(&h->gb);
184 if (sps->timing_info_present_flag) {
185 sps->num_units_in_tick = get_bits_long(&h->gb, 32);
186 sps->time_scale = get_bits_long(&h->gb, 32);
187 if (!sps->num_units_in_tick || !sps->time_scale) {
188 av_log(h->avctx, AV_LOG_ERROR,
189 "time_scale/num_units_in_tick invalid or unsupported (%d/%d)\n",
190 sps->time_scale, sps->num_units_in_tick);
191 return AVERROR_INVALIDDATA;
192 }
193 sps->fixed_frame_rate_flag = get_bits1(&h->gb);
194 }
195
196 sps->nal_hrd_parameters_present_flag = get_bits1(&h->gb);
197 if (sps->nal_hrd_parameters_present_flag)
198 if (decode_hrd_parameters(h, sps) < 0)
199 return AVERROR_INVALIDDATA;
200 sps->vcl_hrd_parameters_present_flag = get_bits1(&h->gb);
201 if (sps->vcl_hrd_parameters_present_flag)
202 if (decode_hrd_parameters(h, sps) < 0)
203 return AVERROR_INVALIDDATA;
204 if (sps->nal_hrd_parameters_present_flag ||
205 sps->vcl_hrd_parameters_present_flag)
206 get_bits1(&h->gb); /* low_delay_hrd_flag */
207 sps->pic_struct_present_flag = get_bits1(&h->gb);
208
209 sps->bitstream_restriction_flag = get_bits1(&h->gb);
210 if (sps->bitstream_restriction_flag) {
211 get_bits1(&h->gb); /* motion_vectors_over_pic_boundaries_flag */
212 get_ue_golomb(&h->gb); /* max_bytes_per_pic_denom */
213 get_ue_golomb(&h->gb); /* max_bits_per_mb_denom */
214 get_ue_golomb(&h->gb); /* log2_max_mv_length_horizontal */
215 get_ue_golomb(&h->gb); /* log2_max_mv_length_vertical */
216 sps->num_reorder_frames = get_ue_golomb(&h->gb);
217 get_ue_golomb(&h->gb); /*max_dec_frame_buffering*/
218
219 if (get_bits_left(&h->gb) < 0) {
220 sps->num_reorder_frames = 0;
221 sps->bitstream_restriction_flag = 0;
222 }
223
224 if (sps->num_reorder_frames > 16U
225 /* max_dec_frame_buffering || max_dec_frame_buffering > 16 */) {
226 av_log(h->avctx, AV_LOG_ERROR,
227 "Clipping illegal num_reorder_frames %d\n",
228 sps->num_reorder_frames);
229 sps->num_reorder_frames = 16;
230 return AVERROR_INVALIDDATA;
231 }
232 }
233 if (get_bits_left(&h->gb) < 0) {
234 av_log(h->avctx, AV_LOG_ERROR,
235 "Overread VUI by %d bits\n", -get_bits_left(&h->gb));
236 return AVERROR_INVALIDDATA;
237 }
238
239 return 0;
240 }
241
242 static void decode_scaling_list(H264Context *h, uint8_t *factors, int size,
243 const uint8_t *jvt_list,
244 const uint8_t *fallback_list)
245 {
246 int i, last = 8, next = 8;
247 const uint8_t *scan = size == 16 ? zigzag_scan : ff_zigzag_direct;
248 if (!get_bits1(&h->gb)) /* matrix not written, we use the predicted one */
249 memcpy(factors, fallback_list, size * sizeof(uint8_t));
250 else
251 for (i = 0; i < size; i++) {
252 if (next)
253 next = (last + get_se_golomb(&h->gb)) & 0xff;
254 if (!i && !next) { /* matrix not written, we use the preset one */
255 memcpy(factors, jvt_list, size * sizeof(uint8_t));
256 break;
257 }
258 last = factors[scan[i]] = next ? next : last;
259 }
260 }
261
262 static void decode_scaling_matrices(H264Context *h, SPS *sps,
263 PPS *pps, int is_sps,
264 uint8_t(*scaling_matrix4)[16],
265 uint8_t(*scaling_matrix8)[64])
266 {
267 int fallback_sps = !is_sps && sps->scaling_matrix_present;
268 const uint8_t *fallback[4] = {
269 fallback_sps ? sps->scaling_matrix4[0] : default_scaling4[0],
270 fallback_sps ? sps->scaling_matrix4[3] : default_scaling4[1],
271 fallback_sps ? sps->scaling_matrix8[0] : default_scaling8[0],
272 fallback_sps ? sps->scaling_matrix8[3] : default_scaling8[1]
273 };
274 if (get_bits1(&h->gb)) {
275 sps->scaling_matrix_present |= is_sps;
276 decode_scaling_list(h, scaling_matrix4[0], 16, default_scaling4[0], fallback[0]); // Intra, Y
277 decode_scaling_list(h, scaling_matrix4[1], 16, default_scaling4[0], scaling_matrix4[0]); // Intra, Cr
278 decode_scaling_list(h, scaling_matrix4[2], 16, default_scaling4[0], scaling_matrix4[1]); // Intra, Cb
279 decode_scaling_list(h, scaling_matrix4[3], 16, default_scaling4[1], fallback[1]); // Inter, Y
280 decode_scaling_list(h, scaling_matrix4[4], 16, default_scaling4[1], scaling_matrix4[3]); // Inter, Cr
281 decode_scaling_list(h, scaling_matrix4[5], 16, default_scaling4[1], scaling_matrix4[4]); // Inter, Cb
282 if (is_sps || pps->transform_8x8_mode) {
283 decode_scaling_list(h, scaling_matrix8[0], 64, default_scaling8[0], fallback[2]); // Intra, Y
284 if (sps->chroma_format_idc == 3) {
285 decode_scaling_list(h, scaling_matrix8[1], 64, default_scaling8[0], scaling_matrix8[0]); // Intra, Cr
286 decode_scaling_list(h, scaling_matrix8[2], 64, default_scaling8[0], scaling_matrix8[1]); // Intra, Cb
287 }
288 decode_scaling_list(h, scaling_matrix8[3], 64, default_scaling8[1], fallback[3]); // Inter, Y
289 if (sps->chroma_format_idc == 3) {
290 decode_scaling_list(h, scaling_matrix8[4], 64, default_scaling8[1], scaling_matrix8[3]); // Inter, Cr
291 decode_scaling_list(h, scaling_matrix8[5], 64, default_scaling8[1], scaling_matrix8[4]); // Inter, Cb
292 }
293 }
294 }
295 }
296
297 int ff_h264_decode_seq_parameter_set(H264Context *h)
298 {
299 int profile_idc, level_idc, constraint_set_flags = 0;
300 unsigned int sps_id;
301 int i, log2_max_frame_num_minus4;
302 SPS *sps;
303
304 profile_idc = get_bits(&h->gb, 8);
305 constraint_set_flags |= get_bits1(&h->gb) << 0; // constraint_set0_flag
306 constraint_set_flags |= get_bits1(&h->gb) << 1; // constraint_set1_flag
307 constraint_set_flags |= get_bits1(&h->gb) << 2; // constraint_set2_flag
308 constraint_set_flags |= get_bits1(&h->gb) << 3; // constraint_set3_flag
309 get_bits(&h->gb, 4); // reserved
310 level_idc = get_bits(&h->gb, 8);
311 sps_id = get_ue_golomb_31(&h->gb);
312
313 if (sps_id >= MAX_SPS_COUNT) {
314 av_log(h->avctx, AV_LOG_ERROR, "sps_id (%d) out of range\n", sps_id);
315 return AVERROR_INVALIDDATA;
316 }
317 sps = av_mallocz(sizeof(SPS));
318 if (!sps)
319 return AVERROR(ENOMEM);
320
321 sps->time_offset_length = 24;
322 sps->profile_idc = profile_idc;
323 sps->constraint_set_flags = constraint_set_flags;
324 sps->level_idc = level_idc;
325
326 memset(sps->scaling_matrix4, 16, sizeof(sps->scaling_matrix4));
327 memset(sps->scaling_matrix8, 16, sizeof(sps->scaling_matrix8));
328 sps->scaling_matrix_present = 0;
329
330 if (sps->profile_idc == 100 || sps->profile_idc == 110 ||
331 sps->profile_idc == 122 || sps->profile_idc == 244 ||
332 sps->profile_idc == 44 || sps->profile_idc == 83 ||
333 sps->profile_idc == 86 || sps->profile_idc == 118 ||
334 sps->profile_idc == 128 || sps->profile_idc == 144) {
335 sps->chroma_format_idc = get_ue_golomb_31(&h->gb);
336 if (sps->chroma_format_idc > 3) {
337 av_log(h->avctx, AV_LOG_ERROR,
338 "chroma_format_idc (%u) out of range\n",
339 sps->chroma_format_idc);
340 goto fail;
341 } else if (sps->chroma_format_idc == 3) {
342 sps->residual_color_transform_flag = get_bits1(&h->gb);
343 }
344 sps->bit_depth_luma = get_ue_golomb(&h->gb) + 8;
345 sps->bit_depth_chroma = get_ue_golomb(&h->gb) + 8;
346 if (sps->bit_depth_chroma != sps->bit_depth_luma) {
347 avpriv_request_sample(h->avctx,
348 "Different chroma and luma bit depth");
349 goto fail;
350 }
351 sps->transform_bypass = get_bits1(&h->gb);
352 decode_scaling_matrices(h, sps, NULL, 1,
353 sps->scaling_matrix4, sps->scaling_matrix8);
354 } else {
355 sps->chroma_format_idc = 1;
356 sps->bit_depth_luma = 8;
357 sps->bit_depth_chroma = 8;
358 }
359
360 log2_max_frame_num_minus4 = get_ue_golomb(&h->gb);
361 if (log2_max_frame_num_minus4 < MIN_LOG2_MAX_FRAME_NUM - 4 ||
362 log2_max_frame_num_minus4 > MAX_LOG2_MAX_FRAME_NUM - 4) {
363 av_log(h->avctx, AV_LOG_ERROR,
364 "log2_max_frame_num_minus4 out of range (0-12): %d\n",
365 log2_max_frame_num_minus4);
366 goto fail;
367 }
368 sps->log2_max_frame_num = log2_max_frame_num_minus4 + 4;
369
370 sps->poc_type = get_ue_golomb_31(&h->gb);
371
372 if (sps->poc_type == 0) { // FIXME #define
373 sps->log2_max_poc_lsb = get_ue_golomb(&h->gb) + 4;
374 } else if (sps->poc_type == 1) { // FIXME #define
375 sps->delta_pic_order_always_zero_flag = get_bits1(&h->gb);
376 sps->offset_for_non_ref_pic = get_se_golomb(&h->gb);
377 sps->offset_for_top_to_bottom_field = get_se_golomb(&h->gb);
378 sps->poc_cycle_length = get_ue_golomb(&h->gb);
379
380 if ((unsigned)sps->poc_cycle_length >=
381 FF_ARRAY_ELEMS(sps->offset_for_ref_frame)) {
382 av_log(h->avctx, AV_LOG_ERROR,
383 "poc_cycle_length overflow %u\n", sps->poc_cycle_length);
384 goto fail;
385 }
386
387 for (i = 0; i < sps->poc_cycle_length; i++)
388 sps->offset_for_ref_frame[i] = get_se_golomb(&h->gb);
389 } else if (sps->poc_type != 2) {
390 av_log(h->avctx, AV_LOG_ERROR, "illegal POC type %d\n", sps->poc_type);
391 goto fail;
392 }
393
394 sps->ref_frame_count = get_ue_golomb_31(&h->gb);
395 if (sps->ref_frame_count > MAX_PICTURE_COUNT - 2 ||
396 sps->ref_frame_count >= 32U) {
397 av_log(h->avctx, AV_LOG_ERROR, "too many reference frames\n");
398 goto fail;
399 }
400 sps->gaps_in_frame_num_allowed_flag = get_bits1(&h->gb);
401 sps->mb_width = get_ue_golomb(&h->gb) + 1;
402 sps->mb_height = get_ue_golomb(&h->gb) + 1;
403 if ((unsigned)sps->mb_width >= INT_MAX / 16 ||
404 (unsigned)sps->mb_height >= INT_MAX / 16 ||
405 av_image_check_size(16 * sps->mb_width,
406 16 * sps->mb_height, 0, h->avctx)) {
407 av_log(h->avctx, AV_LOG_ERROR, "mb_width/height overflow\n");
408 goto fail;
409 }
410
411 sps->frame_mbs_only_flag = get_bits1(&h->gb);
412 if (!sps->frame_mbs_only_flag)
413 sps->mb_aff = get_bits1(&h->gb);
414 else
415 sps->mb_aff = 0;
416
417 sps->direct_8x8_inference_flag = get_bits1(&h->gb);
418 if (!sps->frame_mbs_only_flag && !sps->direct_8x8_inference_flag) {
419 av_log(h->avctx, AV_LOG_ERROR,
420 "This stream was generated by a broken encoder, invalid 8x8 inference\n");
421 goto fail;
422 }
423
424 #ifndef ALLOW_INTERLACE
425 if (sps->mb_aff)
426 av_log(h->avctx, AV_LOG_ERROR,
427 "MBAFF support not included; enable it at compile-time.\n");
428 #endif
429 sps->crop = get_bits1(&h->gb);
430 if (sps->crop) {
431 int crop_left = get_ue_golomb(&h->gb);
432 int crop_right = get_ue_golomb(&h->gb);
433 int crop_top = get_ue_golomb(&h->gb);
434 int crop_bottom = get_ue_golomb(&h->gb);
435
436 if (h->avctx->flags2 & CODEC_FLAG2_IGNORE_CROP) {
437 av_log(h->avctx, AV_LOG_DEBUG, "discarding sps cropping, original "
438 "values are l:%u r:%u t:%u b:%u\n",
439 crop_left, crop_right, crop_top, crop_bottom);
440
441 sps->crop_left =
442 sps->crop_right =
443 sps->crop_top =
444 sps->crop_bottom = 0;
445 } else {
446 int vsub = (sps->chroma_format_idc == 1) ? 1 : 0;
447 int hsub = (sps->chroma_format_idc == 1 ||
448 sps->chroma_format_idc == 2) ? 1 : 0;
449 int step_x = 1 << hsub;
450 int step_y = (2 - sps->frame_mbs_only_flag) << vsub;
451
452 if (crop_left & (0x1F >> (sps->bit_depth_luma > 8)) &&
453 !(h->avctx->flags & CODEC_FLAG_UNALIGNED)) {
454 crop_left &= ~(0x1F >> (sps->bit_depth_luma > 8));
455 av_log(h->avctx, AV_LOG_WARNING,
456 "Reducing left cropping to %d "
457 "chroma samples to preserve alignment.\n",
458 crop_left);
459 }
460
461 sps->crop_left = crop_left * step_x;
462 sps->crop_right = crop_right * step_x;
463 sps->crop_top = crop_top * step_y;
464 sps->crop_bottom = crop_bottom * step_y;
465 }
466 } else {
467 sps->crop_left =
468 sps->crop_right =
469 sps->crop_top =
470 sps->crop_bottom =
471 sps->crop = 0;
472 }
473
474 sps->vui_parameters_present_flag = get_bits1(&h->gb);
475 if (sps->vui_parameters_present_flag) {
476 int ret = decode_vui_parameters(h, sps);
477 if (ret < 0 && h->avctx->err_recognition & AV_EF_EXPLODE)
478 goto fail;
479 }
480
481 if (!sps->sar.den)
482 sps->sar.den = 1;
483
484 if (h->avctx->debug & FF_DEBUG_PICT_INFO) {
485 static const char csp[4][5] = { "Gray", "420", "422", "444" };
486 av_log(h->avctx, AV_LOG_DEBUG,
487 "sps:%u profile:%d/%d poc:%d ref:%d %dx%d %s %s crop:%d/%d/%d/%d %s %s %d/%d\n",
488 sps_id, sps->profile_idc, sps->level_idc,
489 sps->poc_type,
490 sps->ref_frame_count,
491 sps->mb_width, sps->mb_height,
492 sps->frame_mbs_only_flag ? "FRM" : (sps->mb_aff ? "MB-AFF" : "PIC-AFF"),
493 sps->direct_8x8_inference_flag ? "8B8" : "",
494 sps->crop_left, sps->crop_right,
495 sps->crop_top, sps->crop_bottom,
496 sps->vui_parameters_present_flag ? "VUI" : "",
497 csp[sps->chroma_format_idc],
498 sps->timing_info_present_flag ? sps->num_units_in_tick : 0,
499 sps->timing_info_present_flag ? sps->time_scale : 0);
500 }
501 sps->new = 1;
502
503 av_free(h->sps_buffers[sps_id]);
504 h->sps_buffers[sps_id] = sps;
505 h->sps = *sps;
506 h->current_sps_id = sps_id;
507
508 return 0;
509
510 fail:
511 av_free(sps);
512 return -1;
513 }
514
515 static void build_qp_table(PPS *pps, int t, int index, const int depth)
516 {
517 int i;
518 const int max_qp = 51 + 6 * (depth - 8);
519 for (i = 0; i < max_qp + 1; i++)
520 pps->chroma_qp_table[t][i] =
521 ff_h264_chroma_qp[depth - 8][av_clip(i + index, 0, max_qp)];
522 }
523
524 int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length)
525 {
526 unsigned int pps_id = get_ue_golomb(&h->gb);
527 PPS *pps;
528 const int qp_bd_offset = 6 * (h->sps.bit_depth_luma - 8);
529 int bits_left;
530
531 if (pps_id >= MAX_PPS_COUNT) {
532 av_log(h->avctx, AV_LOG_ERROR, "pps_id (%d) out of range\n", pps_id);
533 return AVERROR_INVALIDDATA;
534 } else if (h->sps.bit_depth_luma > 10) {
535 av_log(h->avctx, AV_LOG_ERROR,
536 "Unimplemented luma bit depth=%d (max=10)\n",
537 h->sps.bit_depth_luma);
538 return AVERROR_PATCHWELCOME;
539 }
540
541 pps = av_mallocz(sizeof(PPS));
542 if (!pps)
543 return AVERROR(ENOMEM);
544 pps->sps_id = get_ue_golomb_31(&h->gb);
545 if ((unsigned)pps->sps_id >= MAX_SPS_COUNT ||
546 h->sps_buffers[pps->sps_id] == NULL) {
547 av_log(h->avctx, AV_LOG_ERROR, "sps_id out of range\n");
548 goto fail;
549 }
550
551 pps->cabac = get_bits1(&h->gb);
552 pps->pic_order_present = get_bits1(&h->gb);
553 pps->slice_group_count = get_ue_golomb(&h->gb) + 1;
554 if (pps->slice_group_count > 1) {
555 pps->mb_slice_group_map_type = get_ue_golomb(&h->gb);
556 av_log(h->avctx, AV_LOG_ERROR, "FMO not supported\n");
557 switch (pps->mb_slice_group_map_type) {
558 case 0:
559 #if 0
560 | for (i = 0; i <= num_slice_groups_minus1; i++) | | |
561 | run_length[i] |1 |ue(v) |
562 #endif
563 break;
564 case 2:
565 #if 0
566 | for (i = 0; i < num_slice_groups_minus1; i++) { | | |
567 | top_left_mb[i] |1 |ue(v) |
568 | bottom_right_mb[i] |1 |ue(v) |
569 | } | | |
570 #endif
571 break;
572 case 3:
573 case 4:
574 case 5:
575 #if 0
576 | slice_group_change_direction_flag |1 |u(1) |
577 | slice_group_change_rate_minus1 |1 |ue(v) |
578 #endif
579 break;
580 case 6:
581 #if 0
582 | slice_group_id_cnt_minus1 |1 |ue(v) |
583 | for (i = 0; i <= slice_group_id_cnt_minus1; i++)| | |
584 | slice_group_id[i] |1 |u(v) |
585 #endif
586 break;
587 }
588 }
589 pps->ref_count[0] = get_ue_golomb(&h->gb) + 1;
590 pps->ref_count[1] = get_ue_golomb(&h->gb) + 1;
591 if (pps->ref_count[0] - 1 > 32 - 1 || pps->ref_count[1] - 1 > 32 - 1) {
592 av_log(h->avctx, AV_LOG_ERROR, "reference overflow (pps)\n");
593 goto fail;
594 }
595
596 pps->weighted_pred = get_bits1(&h->gb);
597 pps->weighted_bipred_idc = get_bits(&h->gb, 2);
598 pps->init_qp = get_se_golomb(&h->gb) + 26 + qp_bd_offset;
599 pps->init_qs = get_se_golomb(&h->gb) + 26 + qp_bd_offset;
600 pps->chroma_qp_index_offset[0] = get_se_golomb(&h->gb);
601 pps->deblocking_filter_parameters_present = get_bits1(&h->gb);
602 pps->constrained_intra_pred = get_bits1(&h->gb);
603 pps->redundant_pic_cnt_present = get_bits1(&h->gb);
604
605 pps->transform_8x8_mode = 0;
606 // contents of sps/pps can change even if id doesn't, so reinit
607 h->dequant_coeff_pps = -1;
608 memcpy(pps->scaling_matrix4, h->sps_buffers[pps->sps_id]->scaling_matrix4,
609 sizeof(pps->scaling_matrix4));
610 memcpy(pps->scaling_matrix8, h->sps_buffers[pps->sps_id]->scaling_matrix8,
611 sizeof(pps->scaling_matrix8));
612
613 bits_left = bit_length - get_bits_count(&h->gb);
614 if (bits_left && (bits_left > 8 ||
615 show_bits(&h->gb, bits_left) != 1 << (bits_left - 1))) {
616 pps->transform_8x8_mode = get_bits1(&h->gb);
617 decode_scaling_matrices(h, h->sps_buffers[pps->sps_id], pps, 0,
618 pps->scaling_matrix4, pps->scaling_matrix8);
619 // second_chroma_qp_index_offset
620 pps->chroma_qp_index_offset[1] = get_se_golomb(&h->gb);
621 } else {
622 pps->chroma_qp_index_offset[1] = pps->chroma_qp_index_offset[0];
623 }
624
625 build_qp_table(pps, 0, pps->chroma_qp_index_offset[0],
626 h->sps.bit_depth_luma);
627 build_qp_table(pps, 1, pps->chroma_qp_index_offset[1],
628 h->sps.bit_depth_luma);
629 if (pps->chroma_qp_index_offset[0] != pps->chroma_qp_index_offset[1])
630 pps->chroma_qp_diff = 1;
631
632 if (h->avctx->debug & FF_DEBUG_PICT_INFO) {
633 av_log(h->avctx, AV_LOG_DEBUG,
634 "pps:%u sps:%u %s slice_groups:%d ref:%d/%d %s qp:%d/%d/%d/%d %s %s %s %s\n",
635 pps_id, pps->sps_id,
636 pps->cabac ? "CABAC" : "CAVLC",
637 pps->slice_group_count,
638 pps->ref_count[0], pps->ref_count[1],
639 pps->weighted_pred ? "weighted" : "",
640 pps->init_qp, pps->init_qs, pps->chroma_qp_index_offset[0], pps->chroma_qp_index_offset[1],
641 pps->deblocking_filter_parameters_present ? "LPAR" : "",
642 pps->constrained_intra_pred ? "CONSTR" : "",
643 pps->redundant_pic_cnt_present ? "REDU" : "",
644 pps->transform_8x8_mode ? "8x8DCT" : "");
645 }
646
647 av_free(h->pps_buffers[pps_id]);
648 h->pps_buffers[pps_id] = pps;
649 return 0;
650
651 fail:
652 av_free(pps);
653 return -1;
654 }