FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/h264_parse.c
Date: 2024-02-16 17:37:06
Exec Total Coverage
Lines: 218 294 74.1%
Functions: 9 9 100.0%
Branches: 151 200 75.5%

Line Branch Exec Source
1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg 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 * FFmpeg 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 FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #include "bytestream.h"
20 #include "get_bits.h"
21 #include "golomb.h"
22 #include "h264.h"
23 #include "h264pred.h"
24 #include "h264_parse.h"
25 #include "h264_ps.h"
26 #include "h2645_parse.h"
27 #include "mpegutils.h"
28
29 6445 int ff_h264_pred_weight_table(GetBitContext *gb, const SPS *sps,
30 const int *ref_count, int slice_type_nos,
31 H264PredWeightTable *pwt,
32 int picture_structure, void *logctx)
33 {
34 int list, i, j;
35 int luma_def, chroma_def;
36
37 6445 pwt->use_weight = 0;
38 6445 pwt->use_weight_chroma = 0;
39
40 6445 pwt->luma_log2_weight_denom = get_ue_golomb_31(gb);
41
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6445 if (pwt->luma_log2_weight_denom > 7U) {
42 av_log(logctx, AV_LOG_ERROR, "luma_log2_weight_denom %d is out of range\n", pwt->luma_log2_weight_denom);
43 pwt->luma_log2_weight_denom = 0;
44 }
45 6445 luma_def = 1 << pwt->luma_log2_weight_denom;
46
47
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6445 if (sps->chroma_format_idc) {
48 6445 pwt->chroma_log2_weight_denom = get_ue_golomb_31(gb);
49
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6445 if (pwt->chroma_log2_weight_denom > 7U) {
50 av_log(logctx, AV_LOG_ERROR, "chroma_log2_weight_denom %d is out of range\n", pwt->chroma_log2_weight_denom);
51 pwt->chroma_log2_weight_denom = 0;
52 }
53 6445 chroma_def = 1 << pwt->chroma_log2_weight_denom;
54 }
55
56
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7265 for (list = 0; list < 2; list++) {
57 6855 pwt->luma_weight_flag[list] = 0;
58 6855 pwt->chroma_weight_flag[list] = 0;
59
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27871 for (i = 0; i < ref_count[list]; i++) {
60 int luma_weight_flag, chroma_weight_flag;
61
62 21016 luma_weight_flag = get_bits1(gb);
63
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21016 if (luma_weight_flag) {
64 6730 pwt->luma_weight[i][list][0] = get_se_golomb(gb);
65 6730 pwt->luma_weight[i][list][1] = get_se_golomb(gb);
66
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6730 if ((int8_t)pwt->luma_weight[i][list][0] != pwt->luma_weight[i][list][0] ||
67
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6730 (int8_t)pwt->luma_weight[i][list][1] != pwt->luma_weight[i][list][1])
68 goto out_range_weight;
69
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6730 if (pwt->luma_weight[i][list][0] != luma_def ||
70
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2470 pwt->luma_weight[i][list][1] != 0) {
71 5950 pwt->use_weight = 1;
72 5950 pwt->luma_weight_flag[list] = 1;
73 }
74 } else {
75 14286 pwt->luma_weight[i][list][0] = luma_def;
76 14286 pwt->luma_weight[i][list][1] = 0;
77 }
78
79
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21016 if (sps->chroma_format_idc) {
80 21016 chroma_weight_flag = get_bits1(gb);
81
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21016 if (chroma_weight_flag) {
82 int j;
83
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8679 for (j = 0; j < 2; j++) {
84 5786 pwt->chroma_weight[i][list][j][0] = get_se_golomb(gb);
85 5786 pwt->chroma_weight[i][list][j][1] = get_se_golomb(gb);
86
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5786 if ((int8_t)pwt->chroma_weight[i][list][j][0] != pwt->chroma_weight[i][list][j][0] ||
87
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5786 (int8_t)pwt->chroma_weight[i][list][j][1] != pwt->chroma_weight[i][list][j][1]) {
88 pwt->chroma_weight[i][list][j][0] = chroma_def;
89 pwt->chroma_weight[i][list][j][1] = 0;
90 goto out_range_weight;
91 }
92
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5786 if (pwt->chroma_weight[i][list][j][0] != chroma_def ||
93
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623 pwt->chroma_weight[i][list][j][1] != 0) {
94 5745 pwt->use_weight_chroma = 1;
95 5745 pwt->chroma_weight_flag[list] = 1;
96 }
97 }
98 } else {
99 int j;
100
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54369 for (j = 0; j < 2; j++) {
101 36246 pwt->chroma_weight[i][list][j][0] = chroma_def;
102 36246 pwt->chroma_weight[i][list][j][1] = 0;
103 }
104 }
105 }
106
107 // for MBAFF
108
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21016 if (picture_structure == PICT_FRAME) {
109 18810 pwt->luma_weight[16 + 2 * i][list][0] = pwt->luma_weight[16 + 2 * i + 1][list][0] = pwt->luma_weight[i][list][0];
110 18810 pwt->luma_weight[16 + 2 * i][list][1] = pwt->luma_weight[16 + 2 * i + 1][list][1] = pwt->luma_weight[i][list][1];
111
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18810 if (sps->chroma_format_idc) {
112
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56430 for (j = 0; j < 2; j++) {
113 37620 pwt->chroma_weight[16 + 2 * i][list][j][0] = pwt->chroma_weight[16 + 2 * i + 1][list][j][0] = pwt->chroma_weight[i][list][j][0];
114 37620 pwt->chroma_weight[16 + 2 * i][list][j][1] = pwt->chroma_weight[16 + 2 * i + 1][list][j][1] = pwt->chroma_weight[i][list][j][1];
115 }
116 }
117 }
118 }
119
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6855 if (slice_type_nos != AV_PICTURE_TYPE_B)
120 6035 break;
121 }
122
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6445 pwt->use_weight = pwt->use_weight || pwt->use_weight_chroma;
123 6445 return 0;
124 out_range_weight:
125 avpriv_request_sample(logctx, "Out of range weight");
126 return AVERROR_INVALIDDATA;
127 }
128
129 /**
130 * Check if the top & left blocks are available if needed and
131 * change the dc mode so it only uses the available blocks.
132 */
133 3111332 int ff_h264_check_intra4x4_pred_mode(int8_t *pred_mode_cache, void *logctx,
134 int top_samples_available, int left_samples_available)
135 {
136 static const int8_t top[12] = {
137 -1, 0, LEFT_DC_PRED, -1, -1, -1, -1, -1, 0
138 };
139 static const int8_t left[12] = {
140 0, -1, TOP_DC_PRED, 0, -1, -1, -1, 0, -1, DC_128_PRED
141 };
142 int i;
143
144
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3111332 if (!(top_samples_available & 0x8000)) {
145
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1072785 for (i = 0; i < 4; i++) {
146 858228 int status = top[pred_mode_cache[scan8[0] + i]];
147
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858228 if (status < 0) {
148 av_log(logctx, AV_LOG_ERROR,
149 "top block unavailable for requested intra mode %d\n",
150 status);
151 return AVERROR_INVALIDDATA;
152
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858228 } else if (status) {
153 555802 pred_mode_cache[scan8[0] + i] = status;
154 }
155 }
156 }
157
158
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3111332 if ((left_samples_available & 0x8888) != 0x8888) {
159 static const int mask[4] = { 0x8000, 0x2000, 0x80, 0x20 };
160
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341400 for (i = 0; i < 4; i++)
161
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273120 if (!(left_samples_available & mask[i])) {
162 273066 int status = left[pred_mode_cache[scan8[0] + 8 * i]];
163
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273066 if (status < 0) {
164 av_log(logctx, AV_LOG_ERROR,
165 "left block unavailable for requested intra4x4 mode %d\n",
166 status);
167 return AVERROR_INVALIDDATA;
168
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273066 } else if (status) {
169 100790 pred_mode_cache[scan8[0] + 8 * i] = status;
170 }
171 }
172 }
173
174 3111332 return 0;
175 }
176
177 /**
178 * Check if the top & left blocks are available if needed and
179 * change the dc mode so it only uses the available blocks.
180 */
181 4998788 int ff_h264_check_intra_pred_mode(void *logctx, int top_samples_available,
182 int left_samples_available,
183 int mode, int is_chroma)
184 {
185 static const int8_t top[4] = { LEFT_DC_PRED8x8, 1, -1, -1 };
186 static const int8_t left[5] = { TOP_DC_PRED8x8, -1, 2, -1, DC_128_PRED8x8 };
187
188
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4998788 if (mode > 3U) {
189 av_log(logctx, AV_LOG_ERROR,
190 "out of range intra chroma pred mode\n");
191 return AVERROR_INVALIDDATA;
192 }
193
194
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4998788 if (!(top_samples_available & 0x8000)) {
195 387588 mode = top[mode];
196
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387588 if (mode < 0) {
197 av_log(logctx, AV_LOG_ERROR,
198 "top block unavailable for requested intra mode\n");
199 return AVERROR_INVALIDDATA;
200 }
201 }
202
203
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4998788 if ((left_samples_available & 0x8080) != 0x8080) {
204 106559 mode = left[mode];
205
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106559 if (mode < 0) {
206 av_log(logctx, AV_LOG_ERROR,
207 "left block unavailable for requested intra mode\n");
208 return AVERROR_INVALIDDATA;
209 }
210
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106559 if (is_chroma && (left_samples_available & 0x8080)) {
211 // mad cow disease mode, aka MBAFF + constrained_intra_pred
212 54 mode = ALZHEIMER_DC_L0T_PRED8x8 +
213
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27 (!(left_samples_available & 0x8000)) +
214
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27 2 * (mode == DC_128_PRED8x8);
215 }
216 }
217
218 4998788 return mode;
219 }
220
221 57852 int ff_h264_parse_ref_count(int *plist_count, int ref_count[2],
222 GetBitContext *gb, const PPS *pps,
223 int slice_type_nos, int picture_structure, void *logctx)
224 {
225 int list_count;
226 int num_ref_idx_active_override_flag;
227
228 // set defaults, might be overridden a few lines later
229 57852 ref_count[0] = pps->ref_count[0];
230 57852 ref_count[1] = pps->ref_count[1];
231
232
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57852 if (slice_type_nos != AV_PICTURE_TYPE_I) {
233 unsigned max[2];
234
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51565 max[0] = max[1] = picture_structure == PICT_FRAME ? 15 : 31;
235
236 51565 num_ref_idx_active_override_flag = get_bits1(gb);
237
238
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51565 if (num_ref_idx_active_override_flag) {
239 21852 ref_count[0] = get_ue_golomb(gb) + 1;
240
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21852 if (slice_type_nos == AV_PICTURE_TYPE_B) {
241 6814 ref_count[1] = get_ue_golomb(gb) + 1;
242 } else
243 // full range is spec-ok in this case, even for frames
244 15038 ref_count[1] = 1;
245 }
246
247
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51565 if (slice_type_nos == AV_PICTURE_TYPE_B)
248 14153 list_count = 2;
249 else
250 37412 list_count = 1;
251
252
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51565 if (ref_count[0] - 1 > max[0] || (list_count == 2 && (ref_count[1] - 1 > max[1]))) {
253 av_log(logctx, AV_LOG_ERROR, "reference overflow %u > %u or %u > %u\n",
254 ref_count[0] - 1, max[0], ref_count[1] - 1, max[1]);
255 ref_count[0] = ref_count[1] = 0;
256 *plist_count = 0;
257 goto fail;
258
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51565 } else if (ref_count[1] - 1 > max[1]) {
259 av_log(logctx, AV_LOG_DEBUG, "reference overflow %u > %u \n",
260 ref_count[1] - 1, max[1]);
261 ref_count[1] = 0;
262 }
263
264 } else {
265 6287 list_count = 0;
266 6287 ref_count[0] = ref_count[1] = 0;
267 }
268
269 57852 *plist_count = list_count;
270
271 57852 return 0;
272 fail:
273 *plist_count = 0;
274 ref_count[0] = 0;
275 ref_count[1] = 0;
276 return AVERROR_INVALIDDATA;
277 }
278
279 60707 int ff_h264_init_poc(int pic_field_poc[2], int *pic_poc,
280 const SPS *sps, H264POCContext *pc,
281 int picture_structure, int nal_ref_idc)
282 {
283 60707 const int max_frame_num = 1 << sps->log2_max_frame_num;
284 int64_t field_poc[2];
285
286 60707 pc->frame_num_offset = pc->prev_frame_num_offset;
287
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60707 if (pc->frame_num < pc->prev_frame_num)
288 488 pc->frame_num_offset += max_frame_num;
289
290
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60707 if (sps->poc_type == 0) {
291 45773 const int max_poc_lsb = 1 << sps->log2_max_poc_lsb;
292
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45773 if (pc->prev_poc_lsb < 0)
293 805 pc->prev_poc_lsb = pc->poc_lsb;
294
295
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45773 if (pc->poc_lsb < pc->prev_poc_lsb &&
296
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21124 pc->prev_poc_lsb - pc->poc_lsb >= max_poc_lsb / 2)
297 474 pc->poc_msb = pc->prev_poc_msb + max_poc_lsb;
298
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45299 else if (pc->poc_lsb > pc->prev_poc_lsb &&
299
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21985 pc->prev_poc_lsb - pc->poc_lsb < -max_poc_lsb / 2)
300 338 pc->poc_msb = pc->prev_poc_msb - max_poc_lsb;
301 else
302 44961 pc->poc_msb = pc->prev_poc_msb;
303 45773 field_poc[0] =
304 45773 field_poc[1] = pc->poc_msb + pc->poc_lsb;
305
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45773 if (picture_structure == PICT_FRAME)
306 33685 field_poc[1] += pc->delta_poc_bottom;
307
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14934 } else if (sps->poc_type == 1) {
308 int abs_frame_num;
309 int64_t expected_delta_per_poc_cycle, expectedpoc;
310 int i;
311
312
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6173 if (sps->poc_cycle_length != 0)
313 6173 abs_frame_num = pc->frame_num_offset + pc->frame_num;
314 else
315 abs_frame_num = 0;
316
317
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6173 if (nal_ref_idc == 0 && abs_frame_num > 0)
318 397 abs_frame_num--;
319
320 6173 expected_delta_per_poc_cycle = 0;
321
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16180 for (i = 0; i < sps->poc_cycle_length; i++)
322 // FIXME integrate during sps parse
323 10007 expected_delta_per_poc_cycle += sps->offset_for_ref_frame[i];
324
325
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6173 if (abs_frame_num > 0) {
326 6091 int poc_cycle_cnt = (abs_frame_num - 1) / sps->poc_cycle_length;
327 6091 int frame_num_in_poc_cycle = (abs_frame_num - 1) % sps->poc_cycle_length;
328
329 6091 expectedpoc = poc_cycle_cnt * expected_delta_per_poc_cycle;
330
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14004 for (i = 0; i <= frame_num_in_poc_cycle; i++)
331 7913 expectedpoc = expectedpoc + sps->offset_for_ref_frame[i];
332 } else
333 82 expectedpoc = 0;
334
335
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6173 if (nal_ref_idc == 0)
336 397 expectedpoc = expectedpoc + sps->offset_for_non_ref_pic;
337
338 6173 field_poc[0] = expectedpoc + pc->delta_poc[0];
339 6173 field_poc[1] = field_poc[0] + sps->offset_for_top_to_bottom_field;
340
341
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6173 if (picture_structure == PICT_FRAME)
342 5242 field_poc[1] += pc->delta_poc[1];
343 } else {
344 8761 int poc = 2 * (pc->frame_num_offset + pc->frame_num);
345
346
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8761 if (!nal_ref_idc)
347 poc--;
348
349 8761 field_poc[0] = poc;
350 8761 field_poc[1] = poc;
351 }
352
353
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60707 if ( field_poc[0] != (int)field_poc[0]
354
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60707 || field_poc[1] != (int)field_poc[1])
355 return AVERROR_INVALIDDATA;
356
357
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60707 if (picture_structure != PICT_BOTTOM_FIELD)
358 54297 pic_field_poc[0] = field_poc[0];
359
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60707 if (picture_structure != PICT_TOP_FIELD)
360 54098 pic_field_poc[1] = field_poc[1];
361 60707 *pic_poc = FFMIN(pic_field_poc[0], pic_field_poc[1]);
362
363 60707 return 0;
364 }
365
366 921 static int decode_extradata_ps(const uint8_t *data, int size, H264ParamSets *ps,
367 int is_avc, void *logctx)
368 {
369 921 H2645Packet pkt = { 0 };
370 921 int i, ret = 0;
371
372 921 ret = ff_h2645_packet_split(&pkt, data, size, logctx, is_avc, 2, AV_CODEC_ID_H264, 1, 0);
373
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921 if (ret < 0) {
374 ret = 0;
375 goto fail;
376 }
377
378
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2064 for (i = 0; i < pkt.nb_nals; i++) {
379 1143 H2645NAL *nal = &pkt.nals[i];
380
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1143 switch (nal->type) {
381 571 case H264_NAL_SPS: {
382 571 GetBitContext tmp_gb = nal->gb;
383 571 ret = ff_h264_decode_seq_parameter_set(&tmp_gb, logctx, ps, 0);
384
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571 if (ret >= 0)
385 571 break;
386 3 av_log(logctx, AV_LOG_DEBUG,
387 "SPS decoding failure, trying again with the complete NAL\n");
388 3 init_get_bits8(&tmp_gb, nal->raw_data + 1, nal->raw_size - 1);
389 3 ret = ff_h264_decode_seq_parameter_set(&tmp_gb, logctx, ps, 0);
390
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3 if (ret >= 0)
391 3 break;
392 ret = ff_h264_decode_seq_parameter_set(&nal->gb, logctx, ps, 1);
393 if (ret < 0)
394 goto fail;
395 break;
396 }
397 572 case H264_NAL_PPS:
398 572 ret = ff_h264_decode_picture_parameter_set(&nal->gb, logctx, ps,
399 nal->size_bits);
400
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572 if (ret < 0)
401 goto fail;
402 572 break;
403 default:
404 av_log(logctx, AV_LOG_VERBOSE, "Ignoring NAL type %d in extradata\n",
405 nal->type);
406 break;
407 }
408 }
409
410 921 fail:
411 921 ff_h2645_packet_uninit(&pkt);
412 921 return ret;
413 }
414
415 /* There are (invalid) samples in the wild with mp4-style extradata, where the
416 * parameter sets are stored unescaped (i.e. as RBSP).
417 * This function catches the parameter set decoding failure and tries again
418 * after escaping it */
419 700 static int decode_extradata_ps_mp4(const uint8_t *buf, int buf_size, H264ParamSets *ps,
420 int err_recognition, void *logctx)
421 {
422 int ret;
423
424 700 ret = decode_extradata_ps(buf, buf_size, ps, 1, logctx);
425
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700 if (ret < 0 && !(err_recognition & AV_EF_EXPLODE)) {
426 GetByteContext gbc;
427 PutByteContext pbc;
428 uint8_t *escaped_buf;
429 int escaped_buf_size;
430
431 av_log(logctx, AV_LOG_WARNING,
432 "SPS decoding failure, trying again after escaping the NAL\n");
433
434 if (buf_size / 2 >= (INT16_MAX - AV_INPUT_BUFFER_PADDING_SIZE) / 3)
435 return AVERROR(ERANGE);
436 escaped_buf_size = buf_size * 3 / 2 + AV_INPUT_BUFFER_PADDING_SIZE;
437 escaped_buf = av_mallocz(escaped_buf_size);
438 if (!escaped_buf)
439 return AVERROR(ENOMEM);
440
441 bytestream2_init(&gbc, buf, buf_size);
442 bytestream2_init_writer(&pbc, escaped_buf, escaped_buf_size);
443
444 while (bytestream2_get_bytes_left(&gbc)) {
445 if (bytestream2_get_bytes_left(&gbc) >= 3 &&
446 bytestream2_peek_be24(&gbc) <= 3) {
447 bytestream2_put_be24(&pbc, 3);
448 bytestream2_skip(&gbc, 2);
449 } else
450 bytestream2_put_byte(&pbc, bytestream2_get_byte(&gbc));
451 }
452
453 escaped_buf_size = bytestream2_tell_p(&pbc);
454 AV_WB16(escaped_buf, escaped_buf_size - 2);
455
456 (void)decode_extradata_ps(escaped_buf, escaped_buf_size, ps, 1, logctx);
457 // lorex.mp4 decodes ok even with extradata decoding failing
458 av_freep(&escaped_buf);
459 }
460
461 700 return 0;
462 }
463
464 576 int ff_h264_decode_extradata(const uint8_t *data, int size, H264ParamSets *ps,
465 int *is_avc, int *nal_length_size,
466 int err_recognition, void *logctx)
467 {
468 int ret;
469
470
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576 if (!data || size <= 0)
471 return -1;
472
473
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576 if (data[0] == 1) {
474 int i, cnt, nalsize;
475 355 const uint8_t *p = data;
476
477 355 *is_avc = 1;
478
479
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355 if (size < 7) {
480 av_log(logctx, AV_LOG_ERROR, "avcC %d too short\n", size);
481 return AVERROR_INVALIDDATA;
482 }
483
484 // Decode sps from avcC
485 355 cnt = *(p + 5) & 0x1f; // Number of sps
486 355 p += 6;
487
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705 for (i = 0; i < cnt; i++) {
488 350 nalsize = AV_RB16(p) + 2;
489
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350 if (nalsize > size - (p - data))
490 return AVERROR_INVALIDDATA;
491 350 ret = decode_extradata_ps_mp4(p, nalsize, ps, err_recognition, logctx);
492
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350 if (ret < 0) {
493 av_log(logctx, AV_LOG_ERROR,
494 "Decoding sps %d from avcC failed\n", i);
495 return ret;
496 }
497 350 p += nalsize;
498 }
499 // Decode pps from avcC
500 355 cnt = *(p++); // Number of pps
501
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705 for (i = 0; i < cnt; i++) {
502 350 nalsize = AV_RB16(p) + 2;
503
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350 if (nalsize > size - (p - data))
504 return AVERROR_INVALIDDATA;
505 350 ret = decode_extradata_ps_mp4(p, nalsize, ps, err_recognition, logctx);
506
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350 if (ret < 0) {
507 av_log(logctx, AV_LOG_ERROR,
508 "Decoding pps %d from avcC failed\n", i);
509 return ret;
510 }
511 350 p += nalsize;
512 }
513 // Store right nal length size that will be used to parse all other nals
514 355 *nal_length_size = (data[4] & 0x03) + 1;
515 } else {
516 221 *is_avc = 0;
517 221 ret = decode_extradata_ps(data, size, ps, 0, logctx);
518
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221 if (ret < 0)
519 return ret;
520 }
521 576 return size;
522 }
523
524 /**
525 * Compute profile from profile_idc and constraint_set?_flags.
526 *
527 * @param sps SPS
528 *
529 * @return profile as defined by AV_PROFILE_H264_*
530 */
531 60707 int ff_h264_get_profile(const SPS *sps)
532 {
533 60707 int profile = sps->profile_idc;
534
535
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60707 switch (sps->profile_idc) {
536 14387 case AV_PROFILE_H264_BASELINE:
537 // constraint_set1_flag set to 1
538 14387 profile |= (sps->constraint_set_flags & 1 << 1) ? AV_PROFILE_H264_CONSTRAINED : 0;
539 14387 break;
540 2371 case AV_PROFILE_H264_HIGH_10:
541 case AV_PROFILE_H264_HIGH_422:
542 case AV_PROFILE_H264_HIGH_444_PREDICTIVE:
543 // constraint_set3_flag set to 1
544 2371 profile |= (sps->constraint_set_flags & 1 << 3) ? AV_PROFILE_H264_INTRA : 0;
545 2371 break;
546 }
547
548 60707 return profile;
549 }
550