FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/h264_parse.c
Date: 2021-09-24 03:35:22
Exec Total Coverage
Lines: 218 294 74.1%
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 "h264dec.h"
24 #include "h264_parse.h"
25 #include "h264_ps.h"
26
27 3689 int ff_h264_pred_weight_table(GetBitContext *gb, const SPS *sps,
28 const int *ref_count, int slice_type_nos,
29 H264PredWeightTable *pwt,
30 int picture_structure, void *logctx)
31 {
32 int list, i, j;
33 int luma_def, chroma_def;
34
35 3689 pwt->use_weight = 0;
36 3689 pwt->use_weight_chroma = 0;
37
38 3689 pwt->luma_log2_weight_denom = get_ue_golomb_31(gb);
39
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3689 if (pwt->luma_log2_weight_denom > 7U) {
40 av_log(logctx, AV_LOG_ERROR, "luma_log2_weight_denom %d is out of range\n", pwt->luma_log2_weight_denom);
41 pwt->luma_log2_weight_denom = 0;
42 }
43 3689 luma_def = 1 << pwt->luma_log2_weight_denom;
44
45
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3689 if (sps->chroma_format_idc) {
46 3689 pwt->chroma_log2_weight_denom = get_ue_golomb_31(gb);
47
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3689 if (pwt->chroma_log2_weight_denom > 7U) {
48 av_log(logctx, AV_LOG_ERROR, "chroma_log2_weight_denom %d is out of range\n", pwt->chroma_log2_weight_denom);
49 pwt->chroma_log2_weight_denom = 0;
50 }
51 3689 chroma_def = 1 << pwt->chroma_log2_weight_denom;
52 }
53
54
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4281 for (list = 0; list < 2; list++) {
55 3985 pwt->luma_weight_flag[list] = 0;
56 3985 pwt->chroma_weight_flag[list] = 0;
57
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18977 for (i = 0; i < ref_count[list]; i++) {
58 int luma_weight_flag, chroma_weight_flag;
59
60 14992 luma_weight_flag = get_bits1(gb);
61
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14992 if (luma_weight_flag) {
62 5869 pwt->luma_weight[i][list][0] = get_se_golomb(gb);
63 5869 pwt->luma_weight[i][list][1] = get_se_golomb(gb);
64
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5869 if ((int8_t)pwt->luma_weight[i][list][0] != pwt->luma_weight[i][list][0] ||
65
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5869 (int8_t)pwt->luma_weight[i][list][1] != pwt->luma_weight[i][list][1])
66 goto out_range_weight;
67
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5869 if (pwt->luma_weight[i][list][0] != luma_def ||
68
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2074 pwt->luma_weight[i][list][1] != 0) {
69 5344 pwt->use_weight = 1;
70 5344 pwt->luma_weight_flag[list] = 1;
71 }
72 } else {
73 9123 pwt->luma_weight[i][list][0] = luma_def;
74 9123 pwt->luma_weight[i][list][1] = 0;
75 }
76
77
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14992 if (sps->chroma_format_idc) {
78 14992 chroma_weight_flag = get_bits1(gb);
79
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14992 if (chroma_weight_flag) {
80 int j;
81
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8589 for (j = 0; j < 2; j++) {
82 5726 pwt->chroma_weight[i][list][j][0] = get_se_golomb(gb);
83 5726 pwt->chroma_weight[i][list][j][1] = get_se_golomb(gb);
84
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5726 if ((int8_t)pwt->chroma_weight[i][list][j][0] != pwt->chroma_weight[i][list][j][0] ||
85
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5726 (int8_t)pwt->chroma_weight[i][list][j][1] != pwt->chroma_weight[i][list][j][1]) {
86 pwt->chroma_weight[i][list][j][0] = chroma_def;
87 pwt->chroma_weight[i][list][j][1] = 0;
88 goto out_range_weight;
89 }
90
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5726 if (pwt->chroma_weight[i][list][j][0] != chroma_def ||
91
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599 pwt->chroma_weight[i][list][j][1] != 0) {
92 5709 pwt->use_weight_chroma = 1;
93 5709 pwt->chroma_weight_flag[list] = 1;
94 }
95 }
96 } else {
97 int j;
98
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36387 for (j = 0; j < 2; j++) {
99 24258 pwt->chroma_weight[i][list][j][0] = chroma_def;
100 24258 pwt->chroma_weight[i][list][j][1] = 0;
101 }
102 }
103 }
104
105 // for MBAFF
106
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14992 if (picture_structure == PICT_FRAME) {
107 13494 pwt->luma_weight[16 + 2 * i][list][0] = pwt->luma_weight[16 + 2 * i + 1][list][0] = pwt->luma_weight[i][list][0];
108 13494 pwt->luma_weight[16 + 2 * i][list][1] = pwt->luma_weight[16 + 2 * i + 1][list][1] = pwt->luma_weight[i][list][1];
109
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13494 if (sps->chroma_format_idc) {
110
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40482 for (j = 0; j < 2; j++) {
111 26988 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];
112 26988 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];
113 }
114 }
115 }
116 }
117
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3985 if (slice_type_nos != AV_PICTURE_TYPE_B)
118 3393 break;
119 }
120
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3689 pwt->use_weight = pwt->use_weight || pwt->use_weight_chroma;
121 3689 return 0;
122 out_range_weight:
123 avpriv_request_sample(logctx, "Out of range weight");
124 return AVERROR_INVALIDDATA;
125 }
126
127 /**
128 * Check if the top & left blocks are available if needed and
129 * change the dc mode so it only uses the available blocks.
130 */
131 3004518 int ff_h264_check_intra4x4_pred_mode(int8_t *pred_mode_cache, void *logctx,
132 int top_samples_available, int left_samples_available)
133 {
134 static const int8_t top[12] = {
135 -1, 0, LEFT_DC_PRED, -1, -1, -1, -1, -1, 0
136 };
137 static const int8_t left[12] = {
138 0, -1, TOP_DC_PRED, 0, -1, -1, -1, 0, -1, DC_128_PRED
139 };
140 int i;
141
142
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3004518 if (!(top_samples_available & 0x8000)) {
143
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1026905 for (i = 0; i < 4; i++) {
144 821524 int status = top[pred_mode_cache[scan8[0] + i]];
145
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821524 if (status < 0) {
146 av_log(logctx, AV_LOG_ERROR,
147 "top block unavailable for requested intra mode %d\n",
148 status);
149 return AVERROR_INVALIDDATA;
150
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821524 } else if (status) {
151 532134 pred_mode_cache[scan8[0] + i] = status;
152 }
153 }
154 }
155
156
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3004518 if ((left_samples_available & 0x8888) != 0x8888) {
157 static const int mask[4] = { 0x8000, 0x2000, 0x80, 0x20 };
158
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333290 for (i = 0; i < 4; i++)
159
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266632 if (!(left_samples_available & mask[i])) {
160 266578 int status = left[pred_mode_cache[scan8[0] + 8 * i]];
161
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266578 if (status < 0) {
162 av_log(logctx, AV_LOG_ERROR,
163 "left block unavailable for requested intra4x4 mode %d\n",
164 status);
165 return AVERROR_INVALIDDATA;
166
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266578 } else if (status) {
167 96976 pred_mode_cache[scan8[0] + 8 * i] = status;
168 }
169 }
170 }
171
172 3004518 return 0;
173 }
174
175 /**
176 * Check if the top & left blocks are available if needed and
177 * change the dc mode so it only uses the available blocks.
178 */
179 4599251 int ff_h264_check_intra_pred_mode(void *logctx, int top_samples_available,
180 int left_samples_available,
181 int mode, int is_chroma)
182 {
183 static const int8_t top[4] = { LEFT_DC_PRED8x8, 1, -1, -1 };
184 static const int8_t left[5] = { TOP_DC_PRED8x8, -1, 2, -1, DC_128_PRED8x8 };
185
186
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4599251 if (mode > 3U) {
187 av_log(logctx, AV_LOG_ERROR,
188 "out of range intra chroma pred mode\n");
189 return AVERROR_INVALIDDATA;
190 }
191
192
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4599251 if (!(top_samples_available & 0x8000)) {
193 338030 mode = top[mode];
194
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338030 if (mode < 0) {
195 av_log(logctx, AV_LOG_ERROR,
196 "top block unavailable for requested intra mode\n");
197 return AVERROR_INVALIDDATA;
198 }
199 }
200
201
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4599251 if ((left_samples_available & 0x8080) != 0x8080) {
202 100493 mode = left[mode];
203
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100493 if (mode < 0) {
204 av_log(logctx, AV_LOG_ERROR,
205 "left block unavailable for requested intra mode\n");
206 return AVERROR_INVALIDDATA;
207 }
208
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100493 if (is_chroma && (left_samples_available & 0x8080)) {
209 // mad cow disease mode, aka MBAFF + constrained_intra_pred
210 54 mode = ALZHEIMER_DC_L0T_PRED8x8 +
211
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27 (!(left_samples_available & 0x8000)) +
212
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27 2 * (mode == DC_128_PRED8x8);
213 }
214 }
215
216 4599251 return mode;
217 }
218
219 52549 int ff_h264_parse_ref_count(int *plist_count, int ref_count[2],
220 GetBitContext *gb, const PPS *pps,
221 int slice_type_nos, int picture_structure, void *logctx)
222 {
223 int list_count;
224 int num_ref_idx_active_override_flag;
225
226 // set defaults, might be overridden a few lines later
227 52549 ref_count[0] = pps->ref_count[0];
228 52549 ref_count[1] = pps->ref_count[1];
229
230
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52549 if (slice_type_nos != AV_PICTURE_TYPE_I) {
231 unsigned max[2];
232
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46558 max[0] = max[1] = picture_structure == PICT_FRAME ? 15 : 31;
233
234 46558 num_ref_idx_active_override_flag = get_bits1(gb);
235
236
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46558 if (num_ref_idx_active_override_flag) {
237 20909 ref_count[0] = get_ue_golomb(gb) + 1;
238
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20909 if (slice_type_nos == AV_PICTURE_TYPE_B) {
239 6296 ref_count[1] = get_ue_golomb(gb) + 1;
240 } else
241 // full range is spec-ok in this case, even for frames
242 14613 ref_count[1] = 1;
243 }
244
245
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46558 if (slice_type_nos == AV_PICTURE_TYPE_B)
246 12926 list_count = 2;
247 else
248 33632 list_count = 1;
249
250
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46558 if (ref_count[0] - 1 > max[0] || (list_count == 2 && (ref_count[1] - 1 > max[1]))) {
251 av_log(logctx, AV_LOG_ERROR, "reference overflow %u > %u or %u > %u\n",
252 ref_count[0] - 1, max[0], ref_count[1] - 1, max[1]);
253 ref_count[0] = ref_count[1] = 0;
254 *plist_count = 0;
255 goto fail;
256
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46558 } else if (ref_count[1] - 1 > max[1]) {
257 av_log(logctx, AV_LOG_DEBUG, "reference overflow %u > %u \n",
258 ref_count[1] - 1, max[1]);
259 ref_count[1] = 0;
260 }
261
262 } else {
263 5991 list_count = 0;
264 5991 ref_count[0] = ref_count[1] = 0;
265 }
266
267 52549 *plist_count = list_count;
268
269 52549 return 0;
270 fail:
271 *plist_count = 0;
272 ref_count[0] = 0;
273 ref_count[1] = 0;
274 return AVERROR_INVALIDDATA;
275 }
276
277 55451 int ff_h264_init_poc(int pic_field_poc[2], int *pic_poc,
278 const SPS *sps, H264POCContext *pc,
279 int picture_structure, int nal_ref_idc)
280 {
281 55451 const int max_frame_num = 1 << sps->log2_max_frame_num;
282 int64_t field_poc[2];
283
284 55451 pc->frame_num_offset = pc->prev_frame_num_offset;
285
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55451 if (pc->frame_num < pc->prev_frame_num)
286 347 pc->frame_num_offset += max_frame_num;
287
288
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55451 if (sps->poc_type == 0) {
289 42124 const int max_poc_lsb = 1 << sps->log2_max_poc_lsb;
290
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42124 if (pc->prev_poc_lsb < 0)
291 749 pc->prev_poc_lsb = pc->poc_lsb;
292
293
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42124 if (pc->poc_lsb < pc->prev_poc_lsb &&
294
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19579 pc->prev_poc_lsb - pc->poc_lsb >= max_poc_lsb / 2)
295 296 pc->poc_msb = pc->prev_poc_msb + max_poc_lsb;
296
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41828 else if (pc->poc_lsb > pc->prev_poc_lsb &&
297
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19980 pc->prev_poc_lsb - pc->poc_lsb < -max_poc_lsb / 2)
298 257 pc->poc_msb = pc->prev_poc_msb - max_poc_lsb;
299 else
300 41571 pc->poc_msb = pc->prev_poc_msb;
301 42124 field_poc[0] =
302 42124 field_poc[1] = pc->poc_msb + pc->poc_lsb;
303
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42124 if (picture_structure == PICT_FRAME)
304 30164 field_poc[1] += pc->delta_poc_bottom;
305
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13327 } else if (sps->poc_type == 1) {
306 int abs_frame_num;
307 int64_t expected_delta_per_poc_cycle, expectedpoc;
308 int i;
309
310
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6180 if (sps->poc_cycle_length != 0)
311 6180 abs_frame_num = pc->frame_num_offset + pc->frame_num;
312 else
313 abs_frame_num = 0;
314
315
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6180 if (nal_ref_idc == 0 && abs_frame_num > 0)
316 397 abs_frame_num--;
317
318 6180 expected_delta_per_poc_cycle = 0;
319
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16194 for (i = 0; i < sps->poc_cycle_length; i++)
320 // FIXME integrate during sps parse
321 10014 expected_delta_per_poc_cycle += sps->offset_for_ref_frame[i];
322
323
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6180 if (abs_frame_num > 0) {
324 6098 int poc_cycle_cnt = (abs_frame_num - 1) / sps->poc_cycle_length;
325 6098 int frame_num_in_poc_cycle = (abs_frame_num - 1) % sps->poc_cycle_length;
326
327 6098 expectedpoc = poc_cycle_cnt * expected_delta_per_poc_cycle;
328
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14018 for (i = 0; i <= frame_num_in_poc_cycle; i++)
329 7920 expectedpoc = expectedpoc + sps->offset_for_ref_frame[i];
330 } else
331 82 expectedpoc = 0;
332
333
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6180 if (nal_ref_idc == 0)
334 397 expectedpoc = expectedpoc + sps->offset_for_non_ref_pic;
335
336 6180 field_poc[0] = expectedpoc + pc->delta_poc[0];
337 6180 field_poc[1] = field_poc[0] + sps->offset_for_top_to_bottom_field;
338
339
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6180 if (picture_structure == PICT_FRAME)
340 5249 field_poc[1] += pc->delta_poc[1];
341 } else {
342 7147 int poc = 2 * (pc->frame_num_offset + pc->frame_num);
343
344
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7147 if (!nal_ref_idc)
345 poc--;
346
347 7147 field_poc[0] = poc;
348 7147 field_poc[1] = poc;
349 }
350
351
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55451 if ( field_poc[0] != (int)field_poc[0]
352
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55451 || field_poc[1] != (int)field_poc[1])
353 return AVERROR_INVALIDDATA;
354
355
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55451 if (picture_structure != PICT_BOTTOM_FIELD)
356 49100 pic_field_poc[0] = field_poc[0];
357
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55451 if (picture_structure != PICT_TOP_FIELD)
358 48911 pic_field_poc[1] = field_poc[1];
359 55451 *pic_poc = FFMIN(pic_field_poc[0], pic_field_poc[1]);
360
361 55451 return 0;
362 }
363
364 811 static int decode_extradata_ps(const uint8_t *data, int size, H264ParamSets *ps,
365 int is_avc, void *logctx)
366 {
367 811 H2645Packet pkt = { 0 };
368 811 int i, ret = 0;
369
370 811 ret = ff_h2645_packet_split(&pkt, data, size, logctx, is_avc, 2, AV_CODEC_ID_H264, 1, 0);
371
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811 if (ret < 0) {
372 ret = 0;
373 goto fail;
374 }
375
376
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1832 for (i = 0; i < pkt.nb_nals; i++) {
377 1021 H2645NAL *nal = &pkt.nals[i];
378
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1021 switch (nal->type) {
379 510 case H264_NAL_SPS: {
380 510 GetBitContext tmp_gb = nal->gb;
381 510 ret = ff_h264_decode_seq_parameter_set(&tmp_gb, logctx, ps, 0);
382
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510 if (ret >= 0)
383 510 break;
384 3 av_log(logctx, AV_LOG_DEBUG,
385 "SPS decoding failure, trying again with the complete NAL\n");
386 3 init_get_bits8(&tmp_gb, nal->raw_data + 1, nal->raw_size - 1);
387 3 ret = ff_h264_decode_seq_parameter_set(&tmp_gb, logctx, ps, 0);
388
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3 if (ret >= 0)
389 3 break;
390 ret = ff_h264_decode_seq_parameter_set(&nal->gb, logctx, ps, 1);
391 if (ret < 0)
392 goto fail;
393 break;
394 }
395 511 case H264_NAL_PPS:
396 511 ret = ff_h264_decode_picture_parameter_set(&nal->gb, logctx, ps,
397 nal->size_bits);
398
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511 if (ret < 0)
399 goto fail;
400 511 break;
401 default:
402 av_log(logctx, AV_LOG_VERBOSE, "Ignoring NAL type %d in extradata\n",
403 nal->type);
404 break;
405 }
406 }
407
408 811 fail:
409 811 ff_h2645_packet_uninit(&pkt);
410 811 return ret;
411 }
412
413 /* There are (invalid) samples in the wild with mp4-style extradata, where the
414 * parameter sets are stored unescaped (i.e. as RBSP).
415 * This function catches the parameter set decoding failure and tries again
416 * after escaping it */
417 602 static int decode_extradata_ps_mp4(const uint8_t *buf, int buf_size, H264ParamSets *ps,
418 int err_recognition, void *logctx)
419 {
420 int ret;
421
422 602 ret = decode_extradata_ps(buf, buf_size, ps, 1, logctx);
423
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602 if (ret < 0 && !(err_recognition & AV_EF_EXPLODE)) {
424 GetByteContext gbc;
425 PutByteContext pbc;
426 uint8_t *escaped_buf;
427 int escaped_buf_size;
428
429 av_log(logctx, AV_LOG_WARNING,
430 "SPS decoding failure, trying again after escaping the NAL\n");
431
432 if (buf_size / 2 >= (INT16_MAX - AV_INPUT_BUFFER_PADDING_SIZE) / 3)
433 return AVERROR(ERANGE);
434 escaped_buf_size = buf_size * 3 / 2 + AV_INPUT_BUFFER_PADDING_SIZE;
435 escaped_buf = av_mallocz(escaped_buf_size);
436 if (!escaped_buf)
437 return AVERROR(ENOMEM);
438
439 bytestream2_init(&gbc, buf, buf_size);
440 bytestream2_init_writer(&pbc, escaped_buf, escaped_buf_size);
441
442 while (bytestream2_get_bytes_left(&gbc)) {
443 if (bytestream2_get_bytes_left(&gbc) >= 3 &&
444 bytestream2_peek_be24(&gbc) <= 3) {
445 bytestream2_put_be24(&pbc, 3);
446 bytestream2_skip(&gbc, 2);
447 } else
448 bytestream2_put_byte(&pbc, bytestream2_get_byte(&gbc));
449 }
450
451 escaped_buf_size = bytestream2_tell_p(&pbc);
452 AV_WB16(escaped_buf, escaped_buf_size - 2);
453
454 (void)decode_extradata_ps(escaped_buf, escaped_buf_size, ps, 1, logctx);
455 // lorex.mp4 decodes ok even with extradata decoding failing
456 av_freep(&escaped_buf);
457 }
458
459 602 return 0;
460 }
461
462 513 int ff_h264_decode_extradata(const uint8_t *data, int size, H264ParamSets *ps,
463 int *is_avc, int *nal_length_size,
464 int err_recognition, void *logctx)
465 {
466 int ret;
467
468
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513 if (!data || size <= 0)
469 return -1;
470
471
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513 if (data[0] == 1) {
472 int i, cnt, nalsize;
473 304 const uint8_t *p = data;
474
475 304 *is_avc = 1;
476
477
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304 if (size < 7) {
478 av_log(logctx, AV_LOG_ERROR, "avcC %d too short\n", size);
479 return AVERROR_INVALIDDATA;
480 }
481
482 // Decode sps from avcC
483 304 cnt = *(p + 5) & 0x1f; // Number of sps
484 304 p += 6;
485
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605 for (i = 0; i < cnt; i++) {
486 301 nalsize = AV_RB16(p) + 2;
487
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301 if (nalsize > size - (p - data))
488 return AVERROR_INVALIDDATA;
489 301 ret = decode_extradata_ps_mp4(p, nalsize, ps, err_recognition, logctx);
490
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301 if (ret < 0) {
491 av_log(logctx, AV_LOG_ERROR,
492 "Decoding sps %d from avcC failed\n", i);
493 return ret;
494 }
495 301 p += nalsize;
496 }
497 // Decode pps from avcC
498 304 cnt = *(p++); // Number of pps
499
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605 for (i = 0; i < cnt; i++) {
500 301 nalsize = AV_RB16(p) + 2;
501
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301 if (nalsize > size - (p - data))
502 return AVERROR_INVALIDDATA;
503 301 ret = decode_extradata_ps_mp4(p, nalsize, ps, err_recognition, logctx);
504
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301 if (ret < 0) {
505 av_log(logctx, AV_LOG_ERROR,
506 "Decoding pps %d from avcC failed\n", i);
507 return ret;
508 }
509 301 p += nalsize;
510 }
511 // Store right nal length size that will be used to parse all other nals
512 304 *nal_length_size = (data[4] & 0x03) + 1;
513 } else {
514 209 *is_avc = 0;
515 209 ret = decode_extradata_ps(data, size, ps, 0, logctx);
516
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209 if (ret < 0)
517 return ret;
518 }
519 513 return size;
520 }
521
522 /**
523 * Compute profile from profile_idc and constraint_set?_flags.
524 *
525 * @param sps SPS
526 *
527 * @return profile as defined by FF_PROFILE_H264_*
528 */
529 55451 int ff_h264_get_profile(const SPS *sps)
530 {
531 55451 int profile = sps->profile_idc;
532
533
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55451 switch (sps->profile_idc) {
534 13843 case FF_PROFILE_H264_BASELINE:
535 // constraint_set1_flag set to 1
536 13843 profile |= (sps->constraint_set_flags & 1 << 1) ? FF_PROFILE_H264_CONSTRAINED : 0;
537 13843 break;
538 2130 case FF_PROFILE_H264_HIGH_10:
539 case FF_PROFILE_H264_HIGH_422:
540 case FF_PROFILE_H264_HIGH_444_PREDICTIVE:
541 // constraint_set3_flag set to 1
542 2130 profile |= (sps->constraint_set_flags & 1 << 3) ? FF_PROFILE_H264_INTRA : 0;
543 2130 break;
544 }
545
546 55451 return profile;
547 }
548