FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/parser.c
Date: 2025-10-16 05:50:53
Exec Total Coverage
Lines: 142 159 89.3%
Functions: 6 6 100.0%
Branches: 105 116 90.5%
Line Branch Exec Source
1 /*
2 * Audio and Video frame extraction
3 * Copyright (c) 2003 Fabrice Bellard
4 * Copyright (c) 2003 Michael Niedermayer
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #include <inttypes.h>
24 #include <stdint.h>
25 #include <string.h>
26
27 #include "libavutil/attributes.h"
28 #include "libavutil/avassert.h"
29 #include "libavutil/mem.h"
30
31 #include "parser.h"
32
33 10779 av_cold AVCodecParserContext *av_parser_init(int codec_id)
34 {
35 10779 AVCodecParserContext *s = NULL;
36 const AVCodecParser *parser;
37 10779 void *i = 0;
38 int ret;
39
40
2/2
✓ Branch 0 taken 64 times.
✓ Branch 1 taken 10715 times.
 10779 if (codec_id == AV_CODEC_ID_NONE)
41 64 return NULL;
42
43
2/2
✓ Branch 1 taken 531587 times.
✓ Branch 2 taken 3487 times.
 535074 while ((parser = av_parser_iterate(&i))) {
44
2/2
✓ Branch 0 taken 528422 times.
✓ Branch 1 taken 3165 times.
 531587 if (parser->codec_ids[0] == codec_id ||
45
2/2
✓ Branch 0 taken 524536 times.
✓ Branch 1 taken 3886 times.
 528422 parser->codec_ids[1] == codec_id ||
46
2/2
✓ Branch 0 taken 524379 times.
✓ Branch 1 taken 157 times.
 524536 parser->codec_ids[2] == codec_id ||
47
2/2
✓ Branch 0 taken 524371 times.
✓ Branch 1 taken 8 times.
 524379 parser->codec_ids[3] == codec_id ||
48
2/2
✓ Branch 0 taken 524363 times.
✓ Branch 1 taken 8 times.
 524371 parser->codec_ids[4] == codec_id ||
49
2/2
✓ Branch 0 taken 524359 times.
✓ Branch 1 taken 4 times.
 524363 parser->codec_ids[5] == codec_id ||
50
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 524359 times.
 524359 parser->codec_ids[6] == codec_id)
51 7228 goto found;
52 }
53 3487 return NULL;
54
55 7228 found:
56 7228 s = av_mallocz(sizeof(AVCodecParserContext));
57
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 7228 times.
 7228 if (!s)
58 ✗ goto err_out;
59 7228 s->parser = parser;
60 7228 s->priv_data = av_mallocz(parser->priv_data_size);
61
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 7228 times.
 7228 if (!s->priv_data)
62 ✗ goto err_out;
63 7228 s->fetch_timestamp=1;
64 7228 s->pict_type = AV_PICTURE_TYPE_I;
65
2/2
✓ Branch 0 taken 2237 times.
✓ Branch 1 taken 4991 times.
 7228 if (parser->parser_init) {
66 2237 ret = parser->parser_init(s);
67
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 2237 times.
 2237 if (ret != 0)
68 ✗ goto err_out;
69 }
70 7228 s->key_frame = -1;
71 7228 s->dts_sync_point = INT_MIN;
72 7228 s->dts_ref_dts_delta = INT_MIN;
73 7228 s->pts_dts_delta = INT_MIN;
74 7228 s->format = -1;
75
76 7228 return s;
77
78 ✗ err_out:
79 ✗ if (s)
80 ✗ av_freep(&s->priv_data);
81 ✗ av_free(s);
82 ✗ return NULL;
83 }
84
85 205540 void ff_fetch_timestamp(AVCodecParserContext *s, int off, int remove, int fuzzy)
86 {
87 int i;
88
89
2/2
✓ Branch 0 taken 204707 times.
✓ Branch 1 taken 833 times.
 205540 if (!fuzzy) {
90 204707 s->dts =
91 204707 s->pts = AV_NOPTS_VALUE;
92 204707 s->pos = -1;
93 204707 s->offset = 0;
94 }
95
2/2
✓ Branch 0 taken 609953 times.
✓ Branch 1 taken 65100 times.
 675053 for (i = 0; i < AV_PARSER_PTS_NB; i++) {
96
2/2
✓ Branch 0 taken 600218 times.
✓ Branch 1 taken 9735 times.
 609953 if (s->cur_offset + off >= s->cur_frame_offset[i] &&
97
2/2
✓ Branch 0 taken 405075 times.
✓ Branch 1 taken 195143 times.
 600218 (s->frame_offset < s->cur_frame_offset[i] ||
98
4/4
✓ Branch 0 taken 5766 times.
✓ Branch 1 taken 399309 times.
✓ Branch 2 taken 2164 times.
✓ Branch 3 taken 3602 times.
 405075 (!s->frame_offset && !s->next_frame_offset)) && // first field/frame
99 // check disabled since MPEG-TS does not send complete PES packets
100
2/2
✓ Branch 0 taken 196213 times.
✓ Branch 1 taken 1094 times.
 197307 /*s->next_frame_offset + off <*/ s->cur_frame_end[i]){
101
102
4/4
✓ Branch 0 taken 1129 times.
✓ Branch 1 taken 195084 times.
✓ Branch 2 taken 256 times.
✓ Branch 3 taken 873 times.
 196213 if (!fuzzy || s->cur_frame_dts[i] != AV_NOPTS_VALUE) {
103 195340 s->dts = s->cur_frame_dts[i];
104 195340 s->pts = s->cur_frame_pts[i];
105 195340 s->pos = s->cur_frame_pos[i];
106 195340 s->offset = s->next_frame_offset - s->cur_frame_offset[i];
107 }
108
2/2
✓ Branch 0 taken 12546 times.
✓ Branch 1 taken 183667 times.
 196213 if (remove)
109 12546 s->cur_frame_offset[i] = INT64_MAX;
110
2/2
✓ Branch 0 taken 140440 times.
✓ Branch 1 taken 55773 times.
 196213 if (s->cur_offset + off < s->cur_frame_end[i])
111 140440 break;
112 }
113 }
114 205540 }
115
116 829609 int av_parser_parse2(AVCodecParserContext *s, AVCodecContext *avctx,
117 uint8_t **poutbuf, int *poutbuf_size,
118 const uint8_t *buf, int buf_size,
119 int64_t pts, int64_t dts, int64_t pos)
120 {
121 int index, i;
122 uint8_t dummy_buf[AV_INPUT_BUFFER_PADDING_SIZE];
123
124 av_assert1(avctx->codec_id != AV_CODEC_ID_NONE);
125
126 /* Parsers only work for the specified codec ids. */
127 av_assert1(avctx->codec_id == s->parser->codec_ids[0] ||
128 avctx->codec_id == s->parser->codec_ids[1] ||
129 avctx->codec_id == s->parser->codec_ids[2] ||
130 avctx->codec_id == s->parser->codec_ids[3] ||
131 avctx->codec_id == s->parser->codec_ids[4] ||
132 avctx->codec_id == s->parser->codec_ids[5] ||
133 avctx->codec_id == s->parser->codec_ids[6]);
134
135
2/2
✓ Branch 0 taken 3553 times.
✓ Branch 1 taken 826056 times.
 829609 if (!(s->flags & PARSER_FLAG_FETCHED_OFFSET)) {
136 3553 s->next_frame_offset =
137 3553 s->cur_offset = pos;
138 3553 s->flags |= PARSER_FLAG_FETCHED_OFFSET;
139 }
140
141
2/2
✓ Branch 0 taken 3303 times.
✓ Branch 1 taken 826306 times.
 829609 if (buf_size == 0) {
142 /* padding is always necessary even if EOF, so we add it here */
143 3303 memset(dummy_buf, 0, sizeof(dummy_buf));
144 3303 buf = dummy_buf;
145
2/2
✓ Branch 0 taken 701567 times.
✓ Branch 1 taken 124739 times.
 826306 } else if (s->cur_offset + buf_size != s->cur_frame_end[s->cur_frame_start_index]) { /* skip remainder packets */
146 /* add a new packet descriptor */
147 701567 i = (s->cur_frame_start_index + 1) & (AV_PARSER_PTS_NB - 1);
148 701567 s->cur_frame_start_index = i;
149 701567 s->cur_frame_offset[i] = s->cur_offset;
150 701567 s->cur_frame_end[i] = s->cur_offset + buf_size;
151 701567 s->cur_frame_pts[i] = pts;
152 701567 s->cur_frame_dts[i] = dts;
153 701567 s->cur_frame_pos[i] = pos;
154 }
155
156
2/2
✓ Branch 0 taken 198308 times.
✓ Branch 1 taken 631301 times.
 829609 if (s->fetch_timestamp) {
157 198308 s->fetch_timestamp = 0;
158 198308 s->last_pts = s->pts;
159 198308 s->last_dts = s->dts;
160 198308 s->last_pos = s->pos;
161 198308 ff_fetch_timestamp(s, 0, 0, 0);
162 }
163 /* WARNING: the returned index can be negative */
164 829609 index = s->parser->parser_parse(s, avctx, (const uint8_t **) poutbuf,
165 poutbuf_size, buf, buf_size);
166
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 829609 times.
 829609 av_assert0(index > -0x20000000); // The API does not allow returning AVERROR codes
167 #define FILL(name) if(s->name > 0 && avctx->name <= 0) avctx->name = s->name
168
2/2
✓ Branch 0 taken 627693 times.
✓ Branch 1 taken 201916 times.
 829609 if (avctx->codec_type == AVMEDIA_TYPE_VIDEO) {
169
4/4
✓ Branch 0 taken 236587 times.
✓ Branch 1 taken 391106 times.
✓ Branch 2 taken 483 times.
✓ Branch 3 taken 236104 times.
 627693 FILL(field_order);
170
4/4
✓ Branch 0 taken 331827 times.
✓ Branch 1 taken 295866 times.
✓ Branch 2 taken 829 times.
✓ Branch 3 taken 330998 times.
 627693 FILL(coded_width);
171
4/4
✓ Branch 0 taken 331827 times.
✓ Branch 1 taken 295866 times.
✓ Branch 2 taken 829 times.
✓ Branch 3 taken 330998 times.
 627693 FILL(coded_height);
172
4/4
✓ Branch 0 taken 334964 times.
✓ Branch 1 taken 292729 times.
✓ Branch 2 taken 536 times.
✓ Branch 3 taken 334428 times.
 627693 FILL(width);
173
4/4
✓ Branch 0 taken 334964 times.
✓ Branch 1 taken 292729 times.
✓ Branch 2 taken 536 times.
✓ Branch 3 taken 334428 times.
 627693 FILL(height);
174 }
175
176 /* update the file pointer */
177
2/2
✓ Branch 0 taken 195742 times.
✓ Branch 1 taken 633867 times.
 829609 if (*poutbuf_size) {
178 /* fill the data for the current frame */
179 195742 s->frame_offset = s->next_frame_offset;
180
181 /* offset of the next frame */
182 195742 s->next_frame_offset = s->cur_offset + index;
183 195742 s->fetch_timestamp = 1;
184 } else {
185 /* Don't return a pointer to dummy_buf. */
186 633867 *poutbuf = NULL;
187 }
188
2/2
✓ Branch 0 taken 4858 times.
✓ Branch 1 taken 824751 times.
 829609 if (index < 0)
189 4858 index = 0;
190 829609 s->cur_offset += index;
191 829609 return index;
192 }
193
194 21042 av_cold void av_parser_close(AVCodecParserContext *s)
195 {
196
2/2
✓ Branch 0 taken 7228 times.
✓ Branch 1 taken 13814 times.
 21042 if (s) {
197
2/2
✓ Branch 0 taken 6887 times.
✓ Branch 1 taken 341 times.
 7228 if (s->parser->parser_close)
198 6887 s->parser->parser_close(s);
199 7228 av_freep(&s->priv_data);
200 7228 av_free(s);
201 }
202 21042 }
203
204 768023 int ff_combine_frame(ParseContext *pc, int next,
205 const uint8_t **buf, int *buf_size)
206 {
207 768023 if (pc->overread) {
208 ff_dlog(NULL, "overread %d, state:%"PRIX32" next:%d index:%d o_index:%d\n",
209 pc->overread, pc->state, next, pc->index, pc->overread_index);
210 ff_dlog(NULL, "%X %X %X %X\n",
211 (*buf)[0], (*buf)[1], (*buf)[2], (*buf)[3]);
212 }
213
214 /* Copy overread bytes from last frame into buffer. */
215
2/2
✓ Branch 0 taken 1370 times.
✓ Branch 1 taken 768023 times.
 769393 for (; pc->overread > 0; pc->overread--)
216 1370 pc->buffer[pc->index++] = pc->buffer[pc->overread_index++];
217
218
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 768023 times.
 768023 if (next > *buf_size)
219 ✗ return AVERROR(EINVAL);
220
221 /* flush remaining if EOF */
222
4/4
✓ Branch 0 taken 2169 times.
✓ Branch 1 taken 765854 times.
✓ Branch 2 taken 1720 times.
✓ Branch 3 taken 449 times.
 768023 if (!*buf_size && next == END_NOT_FOUND)
223 1720 next = 0;
224
225 768023 pc->last_index = pc->index;
226
227 /* copy into buffer end return */
228
2/2
✓ Branch 0 taken 623639 times.
✓ Branch 1 taken 144384 times.
 768023 if (next == END_NOT_FOUND) {
229 623639 void *new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size,
230 623639 *buf_size + pc->index +
231 AV_INPUT_BUFFER_PADDING_SIZE);
232
233
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 623639 times.
 623639 if (!new_buffer) {
234 ✗ av_log(NULL, AV_LOG_ERROR, "Failed to reallocate parser buffer to %d\n", *buf_size + pc->index + AV_INPUT_BUFFER_PADDING_SIZE);
235 ✗ pc->index = 0;
236 ✗ return AVERROR(ENOMEM);
237 }
238 623639 pc->buffer = new_buffer;
239 623639 memcpy(&pc->buffer[pc->index], *buf, *buf_size);
240 623639 memset(&pc->buffer[pc->index + *buf_size], 0, AV_INPUT_BUFFER_PADDING_SIZE);
241 623639 pc->index += *buf_size;
242 623639 return -1;
243 }
244
245
3/4
✓ Branch 0 taken 272 times.
✓ Branch 1 taken 144112 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 272 times.
 144384 av_assert0(next >= 0 || pc->buffer);
246
247 144384 *buf_size =
248 144384 pc->overread_index = pc->index + next;
249
250 /* append to buffer */
251
2/2
✓ Branch 0 taken 60748 times.
✓ Branch 1 taken 83636 times.
 144384 if (pc->index) {
252 60748 void *new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size,
253 60748 next + pc->index +
254 AV_INPUT_BUFFER_PADDING_SIZE);
255
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 60748 times.
 60748 if (!new_buffer) {
256 ✗ av_log(NULL, AV_LOG_ERROR, "Failed to reallocate parser buffer to %d\n", next + pc->index + AV_INPUT_BUFFER_PADDING_SIZE);
257 ✗ *buf_size =
258 ✗ pc->overread_index =
259 ✗ pc->index = 0;
260 ✗ return AVERROR(ENOMEM);
261 }
262 60748 pc->buffer = new_buffer;
263
2/2
✓ Branch 0 taken 60743 times.
✓ Branch 1 taken 5 times.
 60748 if (next > -AV_INPUT_BUFFER_PADDING_SIZE)
264 60743 memcpy(&pc->buffer[pc->index], *buf,
265 60743 next + AV_INPUT_BUFFER_PADDING_SIZE);
266 60748 pc->index = 0;
267 60748 *buf = pc->buffer;
268 }
269
270
2/2
✓ Branch 0 taken 38 times.
✓ Branch 1 taken 144346 times.
 144384 if (next < -8) {
271 38 pc->overread += -8 - next;
272 38 next = -8;
273 }
274 /* store overread bytes */
275
2/2
✓ Branch 0 taken 975 times.
✓ Branch 1 taken 144384 times.
 145359 for (; next < 0; next++) {
276 975 pc->state = pc->state << 8 | pc->buffer[pc->last_index + next];
277 975 pc->state64 = pc->state64 << 8 | pc->buffer[pc->last_index + next];
278 975 pc->overread++;
279 }
280
281 144384 if (pc->overread) {
282 ff_dlog(NULL, "overread %d, state:%"PRIX32" next:%d index:%d o_index:%d\n",
283 pc->overread, pc->state, next, pc->index, pc->overread_index);
284 ff_dlog(NULL, "%X %X %X %X\n",
285 (*buf)[0], (*buf)[1], (*buf)[2], (*buf)[3]);
286 }
287
288 144384 return 0;
289 }
290
291 5587 av_cold void ff_parse_close(AVCodecParserContext *s)
292 {
293 5587 ParseContext *pc = s->priv_data;
294
295 5587 av_freep(&pc->buffer);
296 5587 }
297