FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/parser.c
Date: 2026-04-21 18:58:04
Exec Total Coverage
Lines: 145 163 89.0%
Functions: 6 6 100.0%
Branches: 107 124 86.3%
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 "codec_desc.h"
32 #include "parser.h"
33 #include "parser_internal.h"
34
35 #if FF_API_PARSER_CODECID
36 10964 av_cold AVCodecParserContext *av_parser_init(int codec_id)
37 #else
38 av_cold AVCodecParserContext *av_parser_init(enum AVCodecID codec_id)
39 #endif
40 {
41 10964 AVCodecParserContext *s = NULL;
42 const AVCodecParser *parser;
43 const FFCodecParser *ffparser;
44 10964 void *i = 0;
45 int ret;
46
47
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 10964 if (codec_id == AV_CODEC_ID_NONE)
48 64 return NULL;
49
50
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 566803 while ((parser = av_parser_iterate(&i))) {
51
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 563314 if (parser->codec_ids[0] == codec_id ||
52
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 559979 parser->codec_ids[1] == codec_id ||
53
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 556082 parser->codec_ids[2] == codec_id ||
54
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 555923 parser->codec_ids[3] == codec_id ||
55
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 555915 parser->codec_ids[4] == codec_id ||
56
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 555907 parser->codec_ids[5] == codec_id ||
57
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 555903 parser->codec_ids[6] == codec_id)
58 7411 goto found;
59 }
60 3489 return NULL;
61
62 7411 found:
63 7411 ffparser = ffcodecparser(parser);
64 7411 s = av_mallocz(sizeof(AVCodecParserContext));
65
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 7411 if (!s)
66 ✗ goto err_out;
67 7411 s->parser = parser;
68 7411 s->priv_data = av_mallocz(ffparser->priv_data_size);
69
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 7411 if (!s->priv_data)
70 ✗ goto err_out;
71 7411 s->fetch_timestamp=1;
72 7411 s->pict_type = AV_PICTURE_TYPE_I;
73
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 7411 if (ffparser->init) {
74 2308 ret = ffparser->init(s);
75
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 2308 if (ret != 0)
76 ✗ goto err_out;
77 }
78 7411 s->key_frame = -1;
79 7411 s->dts_sync_point = INT_MIN;
80 7411 s->dts_ref_dts_delta = INT_MIN;
81 7411 s->pts_dts_delta = INT_MIN;
82 7411 s->format = -1;
83
84 7411 return s;
85
86 ✗ err_out:
87 ✗ if (s)
88 ✗ av_freep(&s->priv_data);
89 ✗ av_free(s);
90 ✗ return NULL;
91 }
92
93 241457 void ff_fetch_timestamp(AVCodecParserContext *s, int off, int remove, int fuzzy)
94 {
95 int i;
96
97
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 241457 if (!fuzzy) {
98 240618 s->dts =
99 240618 s->pts = AV_NOPTS_VALUE;
100 240618 s->pos = -1;
101 240618 s->offset = 0;
102 }
103
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 845672 for (i = 0; i < AV_PARSER_PTS_NB; i++) {
104
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 748199 if (s->cur_offset + off >= s->cur_frame_offset[i] &&
105
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 738456 (s->frame_offset < s->cur_frame_offset[i] ||
106
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 539105 (!s->frame_offset && !s->next_frame_offset)) && // first field/frame
107 // check disabled since MPEG-TS does not send complete PES packets
108
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 201541 /*s->next_frame_offset + off <*/ s->cur_frame_end[i]){
109
110
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 200426 if (!fuzzy || s->cur_frame_dts[i] != AV_NOPTS_VALUE) {
111 199553 s->dts = s->cur_frame_dts[i];
112 199553 s->pts = s->cur_frame_pts[i];
113 199553 s->pos = s->cur_frame_pos[i];
114 199553 s->offset = s->next_frame_offset - s->cur_frame_offset[i];
115 }
116
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 200426 if (remove)
117 12690 s->cur_frame_offset[i] = INT64_MAX;
118
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 200426 if (s->cur_offset + off < s->cur_frame_end[i])
119 143984 break;
120 }
121 }
122 241457 }
123
124 870787 int av_parser_parse2(AVCodecParserContext *s, AVCodecContext *avctx,
125 uint8_t **poutbuf, int *poutbuf_size,
126 const uint8_t *buf, int buf_size,
127 int64_t pts, int64_t dts, int64_t pos)
128 {
129 const AVCodecDescriptor *desc;
130 int index, i;
131 uint8_t dummy_buf[AV_INPUT_BUFFER_PADDING_SIZE];
132
133 av_assert1(avctx->codec_id != AV_CODEC_ID_NONE);
134
135 /* Parsers only work for the specified codec ids. */
136 av_assert1(avctx->codec_id == s->parser->codec_ids[0] ||
137 avctx->codec_id == s->parser->codec_ids[1] ||
138 avctx->codec_id == s->parser->codec_ids[2] ||
139 avctx->codec_id == s->parser->codec_ids[3] ||
140 avctx->codec_id == s->parser->codec_ids[4] ||
141 avctx->codec_id == s->parser->codec_ids[5] ||
142 avctx->codec_id == s->parser->codec_ids[6]);
143
144 870787 desc = avcodec_descriptor_get(avctx->codec_id);
145
146
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 870787 if (!(s->flags & PARSER_FLAG_FETCHED_OFFSET)) {
147 3659 s->next_frame_offset =
148 3659 s->cur_offset = pos;
149 3659 s->flags |= PARSER_FLAG_FETCHED_OFFSET;
150 }
151
152
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 870787 if (buf_size == 0) {
153 /* padding is always necessary even if EOF, so we add it here */
154 3434 memset(dummy_buf, 0, sizeof(dummy_buf));
155 3434 buf = dummy_buf;
156
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 867353 } else if (s->cur_offset + buf_size != s->cur_frame_end[s->cur_frame_start_index]) { /* skip remainder packets */
157 /* add a new packet descriptor */
158 708318 i = (s->cur_frame_start_index + 1) & (AV_PARSER_PTS_NB - 1);
159 708318 s->cur_frame_start_index = i;
160 708318 s->cur_frame_offset[i] = s->cur_offset;
161 708318 s->cur_frame_end[i] = s->cur_offset + buf_size;
162 708318 s->cur_frame_pts[i] = pts;
163 708318 s->cur_frame_dts[i] = dts;
164 708318 s->cur_frame_pos[i] = pos;
165 }
166
167
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 870787 if (s->fetch_timestamp) {
168 234146 s->fetch_timestamp = 0;
169 234146 s->last_pts = s->pts;
170 234146 s->last_dts = s->dts;
171 234146 s->last_pos = s->pos;
172 234146 ff_fetch_timestamp(s, 0, 0, 0);
173 }
174 /* WARNING: the returned index can be negative */
175 870787 index = ffcodecparser(s->parser)->parse(s, avctx, (const uint8_t **) poutbuf,
176 poutbuf_size, buf, buf_size);
177
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 870787 av_assert0(index > -0x20000000); // The API does not allow returning AVERROR codes
178 #define FILL(name) if(s->name > 0 && avctx->name <= 0) avctx->name = s->name
179
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 870787 if (avctx->codec_type == AVMEDIA_TYPE_VIDEO) {
180
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 632804 FILL(field_order);
181
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 632804 FILL(coded_width);
182
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 632804 FILL(coded_height);
183
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 632804 FILL(width);
184
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 632804 FILL(height);
185
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 632804 if (desc && (desc->props & AV_CODEC_PROP_ENHANCEMENT) &&
186 ✗ s->format >= 0 && avctx->pix_fmt < 0) avctx->pix_fmt = s->format;
187 }
188
189 /* update the file pointer */
190
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 870787 if (*poutbuf_size) {
191 /* fill the data for the current frame */
192 231492 s->frame_offset = s->next_frame_offset;
193
194 /* offset of the next frame */
195 231492 s->next_frame_offset = s->cur_offset + index;
196 231492 s->fetch_timestamp = 1;
197 } else {
198 /* Don't return a pointer to dummy_buf. */
199 639295 *poutbuf = NULL;
200 }
201
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 870787 if (index < 0)
202 4943 index = 0;
203 870787 s->cur_offset += index;
204 870787 return index;
205 }
206
207 21477 av_cold void av_parser_close(AVCodecParserContext *s)
208 {
209
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 21477 if (s) {
210
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 7411 if (ffcodecparser(s->parser)->close)
211 7028 ffcodecparser(s->parser)->close(s);
212 7411 av_freep(&s->priv_data);
213 7411 av_free(s);
214 }
215 21477 }
216
217 807882 int ff_combine_frame(ParseContext *pc, int next,
218 const uint8_t **buf, int *buf_size)
219 {
220 807882 if (pc->overread) {
221 ff_dlog(NULL, "overread %d, state:%"PRIX32" next:%d index:%d o_index:%d\n",
222 pc->overread, pc->state, next, pc->index, pc->overread_index);
223 ff_dlog(NULL, "%X %X %X %X\n",
224 (*buf)[0], (*buf)[1], (*buf)[2], (*buf)[3]);
225 }
226
227 /* Copy overread bytes from last frame into buffer. */
228
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 809273 for (; pc->overread > 0; pc->overread--)
229 1391 pc->buffer[pc->index++] = pc->buffer[pc->overread_index++];
230
231
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 807882 if (next > *buf_size)
232 ✗ return AVERROR(EINVAL);
233
234 /* flush remaining if EOF */
235
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 807882 if (!*buf_size && next == END_NOT_FOUND)
236 1793 next = 0;
237
238 807882 pc->last_index = pc->index;
239
240 /* copy into buffer end return */
241
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 807882 if (next == END_NOT_FOUND) {
242 628981 void *new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size,
243 628981 *buf_size + pc->index +
244 AV_INPUT_BUFFER_PADDING_SIZE);
245
246
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 628981 if (!new_buffer) {
247 ✗ av_log(NULL, AV_LOG_ERROR, "Failed to reallocate parser buffer to %d\n", *buf_size + pc->index + AV_INPUT_BUFFER_PADDING_SIZE);
248 ✗ pc->index = 0;
249 ✗ return AVERROR(ENOMEM);
250 }
251 628981 pc->buffer = new_buffer;
252 628981 memcpy(&pc->buffer[pc->index], *buf, *buf_size);
253 628981 memset(&pc->buffer[pc->index + *buf_size], 0, AV_INPUT_BUFFER_PADDING_SIZE);
254 628981 pc->index += *buf_size;
255 628981 return -1;
256 }
257
258
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 178901 av_assert0(next >= 0 || pc->buffer);
259
260 178901 *buf_size =
261 178901 pc->overread_index = pc->index + next;
262
263 /* append to buffer */
264
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 178901 if (pc->index) {
265 62810 void *new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size,
266 62810 next + pc->index +
267 AV_INPUT_BUFFER_PADDING_SIZE);
268
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 62810 if (!new_buffer) {
269 ✗ av_log(NULL, AV_LOG_ERROR, "Failed to reallocate parser buffer to %d\n", next + pc->index + AV_INPUT_BUFFER_PADDING_SIZE);
270 ✗ *buf_size =
271 ✗ pc->overread_index =
272 ✗ pc->index = 0;
273 ✗ return AVERROR(ENOMEM);
274 }
275 62810 pc->buffer = new_buffer;
276
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 62810 if (next > -AV_INPUT_BUFFER_PADDING_SIZE)
277 62805 memcpy(&pc->buffer[pc->index], *buf,
278 62805 next + AV_INPUT_BUFFER_PADDING_SIZE);
279 62810 pc->index = 0;
280 62810 *buf = pc->buffer;
281 }
282
283
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 178901 if (next < -8) {
284 38 pc->overread += -8 - next;
285 38 next = -8;
286 }
287 /* store overread bytes */
288
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 179897 for (; next < 0; next++) {
289 996 pc->state = pc->state << 8 | pc->buffer[pc->last_index + next];
290 996 pc->state64 = pc->state64 << 8 | pc->buffer[pc->last_index + next];
291 996 pc->overread++;
292 }
293
294 178901 if (pc->overread) {
295 ff_dlog(NULL, "overread %d, state:%"PRIX32" next:%d index:%d o_index:%d\n",
296 pc->overread, pc->state, next, pc->index, pc->overread_index);
297 ff_dlog(NULL, "%X %X %X %X\n",
298 (*buf)[0], (*buf)[1], (*buf)[2], (*buf)[3]);
299 }
300
301 178901 return 0;
302 }
303
304 5668 av_cold void ff_parse_close(AVCodecParserContext *s)
305 {
306 5668 ParseContext *pc = s->priv_data;
307
308 5668 av_freep(&pc->buffer);
309 5668 }
310