FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/parser.c
Date: 2026-07-21 08:37:06
Exec Total Coverage
Lines: 146 163 89.6%
Functions: 6 6 100.0%
Branches: 112 124 90.3%
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 11271 av_cold AVCodecParserContext *av_parser_init(enum AVCodecID codec_id)
36 {
37 11271 AVCodecParserContext *s = NULL;
38 const AVCodecParser *parser;
39 const FFCodecParser *ffparser;
40 11271 void *i = 0;
41 int ret;
42
43
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 11271 if (codec_id == AV_CODEC_ID_NONE)
44 74 return NULL;
45
46
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 580514 while ((parser = av_parser_iterate(&i))) {
47
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 576956 if (parser->codec_ids[0] == codec_id ||
48
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 573514 parser->codec_ids[1] == codec_id ||
49
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 569536 parser->codec_ids[2] == codec_id ||
50
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 569337 parser->codec_ids[3] == codec_id ||
51
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 569329 parser->codec_ids[4] == codec_id ||
52
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 569321 parser->codec_ids[5] == codec_id ||
53
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 569317 parser->codec_ids[6] == codec_id)
54 7639 goto found;
55 }
56 3558 return NULL;
57
58 7639 found:
59 7639 ffparser = ffcodecparser(parser);
60 7639 s = av_mallocz(sizeof(AVCodecParserContext));
61
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 7639 if (!s)
62 ✗ goto err_out;
63 7639 s->parser = parser;
64 7639 s->priv_data = av_mallocz(ffparser->priv_data_size);
65
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 7639 if (!s->priv_data)
66 ✗ goto err_out;
67 7639 s->fetch_timestamp=1;
68 7639 s->pict_type = AV_PICTURE_TYPE_I;
69
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 7639 if (ffparser->init) {
70 2401 ret = ffparser->init(s);
71
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 2401 if (ret != 0)
72 ✗ goto err_out;
73 }
74 7639 s->key_frame = -1;
75 7639 s->dts_sync_point = INT_MIN;
76 7639 s->dts_ref_dts_delta = INT_MIN;
77 7639 s->pts_dts_delta = INT_MIN;
78 7639 s->format = -1;
79
80 7639 return s;
81
82 ✗ err_out:
83 ✗ if (s)
84 ✗ av_freep(&s->priv_data);
85 ✗ av_free(s);
86 ✗ return NULL;
87 }
88
89 243705 void ff_fetch_timestamp(AVCodecParserContext *s, int off, int remove, int fuzzy)
90 {
91 int i;
92
93
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 243705 if (!fuzzy) {
94 242827 s->dts =
95 242827 s->pts = AV_NOPTS_VALUE;
96 242827 s->pos = -1;
97 242827 s->offset = 0;
98 }
99
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 854176 for (i = 0; i < AV_PARSER_PTS_NB; i++) {
100
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 755485 if (s->cur_offset + off >= s->cur_frame_offset[i] &&
101
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 745150 (s->frame_offset < s->cur_frame_offset[i] ||
102
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 543534 (!s->frame_offset && !s->next_frame_offset)) && // first field/frame
103 // check disabled since MPEG-TS does not send complete PES packets
104
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 203798 /*s->next_frame_offset + off <*/ s->cur_frame_end[i]){
105
106
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 202687 if (!fuzzy || s->cur_frame_dts[i] != AV_NOPTS_VALUE) {
107 201814 s->dts = s->cur_frame_dts[i];
108 201814 s->pts = s->cur_frame_pts[i];
109 201814 s->pos = s->cur_frame_pos[i];
110 201814 s->offset = s->next_frame_offset - s->cur_frame_offset[i];
111 }
112
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 202687 if (remove)
113 12928 s->cur_frame_offset[i] = INT64_MAX;
114
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 202687 if (s->cur_offset + off < s->cur_frame_end[i])
115 145014 break;
116 }
117 }
118 243705 }
119
120 886005 int av_parser_parse2(AVCodecParserContext *s, AVCodecContext *avctx,
121 uint8_t **poutbuf, int *poutbuf_size,
122 const uint8_t *buf, int buf_size,
123 int64_t pts, int64_t dts, int64_t pos)
124 {
125 const AVCodecDescriptor *desc;
126 int index, i;
127 uint8_t dummy_buf[AV_INPUT_BUFFER_PADDING_SIZE];
128
129 av_assert1(avctx->codec_id != AV_CODEC_ID_NONE);
130
131 /* Parsers only work for the specified codec ids. */
132 av_assert1(avctx->codec_id == s->parser->codec_ids[0] ||
133 avctx->codec_id == s->parser->codec_ids[1] ||
134 avctx->codec_id == s->parser->codec_ids[2] ||
135 avctx->codec_id == s->parser->codec_ids[3] ||
136 avctx->codec_id == s->parser->codec_ids[4] ||
137 avctx->codec_id == s->parser->codec_ids[5] ||
138 avctx->codec_id == s->parser->codec_ids[6]);
139
140 886005 desc = avcodec_descriptor_get(avctx->codec_id);
141
142
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 886005 if (!(s->flags & PARSER_FLAG_FETCHED_OFFSET)) {
143 3771 s->next_frame_offset =
144 3771 s->cur_offset = pos;
145 3771 s->flags |= PARSER_FLAG_FETCHED_OFFSET;
146 }
147
148
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 886005 if (buf_size == 0) {
149 /* padding is always necessary even if EOF, so we add it here */
150 3524 memset(dummy_buf, 0, sizeof(dummy_buf));
151 3524 buf = dummy_buf;
152
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 882481 } else if (s->cur_offset + buf_size != s->cur_frame_end[s->cur_frame_start_index]) { /* skip remainder packets */
153 /* add a new packet descriptor */
154 719516 i = (s->cur_frame_start_index + 1) & (AV_PARSER_PTS_NB - 1);
155 719516 s->cur_frame_start_index = i;
156 719516 s->cur_frame_offset[i] = s->cur_offset;
157 719516 s->cur_frame_end[i] = s->cur_offset + buf_size;
158 719516 s->cur_frame_pts[i] = pts;
159 719516 s->cur_frame_dts[i] = dts;
160 719516 s->cur_frame_pos[i] = pos;
161 }
162
163
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 886005 if (s->fetch_timestamp) {
164 236158 s->fetch_timestamp = 0;
165 236158 s->last_pts = s->pts;
166 236158 s->last_dts = s->dts;
167 236158 s->last_pos = s->pos;
168 236158 ff_fetch_timestamp(s, 0, 0, 0);
169 }
170 /* WARNING: the returned index can be negative */
171 886005 index = ffcodecparser(s->parser)->parse(s, avctx, (const uint8_t **) poutbuf,
172 poutbuf_size, buf, buf_size);
173
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 886005 av_assert0(index > -0x20000000); // The API does not allow returning AVERROR codes
174 #define FILL(name) if(s->name > 0 && avctx->name <= 0) avctx->name = s->name
175
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 886005 if (avctx->codec_type == AVMEDIA_TYPE_VIDEO) {
176
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 634941 FILL(field_order);
177
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 634941 FILL(coded_width);
178
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 634941 FILL(coded_height);
179
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 634941 FILL(width);
180
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 634941 FILL(height);
181
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 634941 if (desc && (desc->props & AV_CODEC_PROP_ENHANCEMENT) &&
182
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 549 s->format >= 0 && avctx->pix_fmt < 0) avctx->pix_fmt = s->format;
183 }
184
185 /* update the file pointer */
186
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 886005 if (*poutbuf_size) {
187 /* fill the data for the current frame */
188 233409 s->frame_offset = s->next_frame_offset;
189
190 /* offset of the next frame */
191 233409 s->next_frame_offset = s->cur_offset + index;
192 233409 s->fetch_timestamp = 1;
193 } else {
194 /* Don't return a pointer to dummy_buf. */
195 652596 *poutbuf = NULL;
196 }
197
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 886005 if (index < 0)
198 4778 index = 0;
199 886005 s->cur_offset += index;
200 886005 return index;
201 }
202
203 21985 av_cold void av_parser_close(AVCodecParserContext *s)
204 {
205
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 21985 if (s) {
206
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 7639 if (ffcodecparser(s->parser)->close)
207 7207 ffcodecparser(s->parser)->close(s);
208 7639 av_freep(&s->priv_data);
209 7639 av_free(s);
210 }
211 21985 }
212
213 818436 int ff_combine_frame(ParseContext *pc, int next,
214 const uint8_t **buf, int *buf_size)
215 {
216 818436 if (pc->overread) {
217 ff_dlog(NULL, "overread %d, state:%"PRIX32" next:%d index:%d o_index:%d\n",
218 pc->overread, pc->state, next, pc->index, pc->overread_index);
219 ff_dlog(NULL, "%X %X %X %X\n",
220 (*buf)[0], (*buf)[1], (*buf)[2], (*buf)[3]);
221 }
222
223 /* Copy overread bytes from last frame into buffer. */
224
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 819847 for (; pc->overread > 0; pc->overread--)
225 1411 pc->buffer[pc->index++] = pc->buffer[pc->overread_index++];
226
227
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 818436 if (next > *buf_size)
228 ✗ return AVERROR(EINVAL);
229
230 /* flush remaining if EOF */
231
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 818436 if (!*buf_size && next == END_NOT_FOUND)
232 1881 next = 0;
233
234 818436 pc->last_index = pc->index;
235
236 /* copy into buffer end return */
237
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 818436 if (next == END_NOT_FOUND) {
238 637397 void *new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size,
239 637397 *buf_size + pc->index +
240 AV_INPUT_BUFFER_PADDING_SIZE);
241
242
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 637397 if (!new_buffer) {
243 ✗ av_log(NULL, AV_LOG_ERROR, "Failed to reallocate parser buffer to %d\n", *buf_size + pc->index + AV_INPUT_BUFFER_PADDING_SIZE);
244 ✗ pc->index = 0;
245 ✗ return AVERROR(ENOMEM);
246 }
247 637397 pc->buffer = new_buffer;
248 637397 memcpy(&pc->buffer[pc->index], *buf, *buf_size);
249 637397 memset(&pc->buffer[pc->index + *buf_size], 0, AV_INPUT_BUFFER_PADDING_SIZE);
250 637397 pc->index += *buf_size;
251 637397 return -1;
252 }
253
254
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 181039 av_assert0(next >= 0 || pc->buffer);
255
256 181039 *buf_size =
257 181039 pc->overread_index = pc->index + next;
258
259 /* append to buffer */
260
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 181039 if (pc->index) {
261 65882 void *new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size,
262 65882 next + pc->index +
263 AV_INPUT_BUFFER_PADDING_SIZE);
264
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 65882 if (!new_buffer) {
265 ✗ av_log(NULL, AV_LOG_ERROR, "Failed to reallocate parser buffer to %d\n", next + pc->index + AV_INPUT_BUFFER_PADDING_SIZE);
266 ✗ *buf_size =
267 ✗ pc->overread_index =
268 ✗ pc->index = 0;
269 ✗ return AVERROR(ENOMEM);
270 }
271 65882 pc->buffer = new_buffer;
272
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 65882 if (next > -AV_INPUT_BUFFER_PADDING_SIZE)
273 65877 memcpy(&pc->buffer[pc->index], *buf,
274 65877 next + AV_INPUT_BUFFER_PADDING_SIZE);
275 65882 pc->index = 0;
276 65882 *buf = pc->buffer;
277 }
278
279
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 181039 if (next < -8) {
280 38 pc->overread += -8 - next;
281 38 next = -8;
282 }
283 /* store overread bytes */
284
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 182055 for (; next < 0; next++) {
285 1016 pc->state = pc->state << 8 | pc->buffer[pc->last_index + next];
286 1016 pc->state64 = pc->state64 << 8 | pc->buffer[pc->last_index + next];
287 1016 pc->overread++;
288 }
289
290 181039 if (pc->overread) {
291 ff_dlog(NULL, "overread %d, state:%"PRIX32" next:%d index:%d o_index:%d\n",
292 pc->overread, pc->state, next, pc->index, pc->overread_index);
293 ff_dlog(NULL, "%X %X %X %X\n",
294 (*buf)[0], (*buf)[1], (*buf)[2], (*buf)[3]);
295 }
296
297 181039 return 0;
298 }
299
300 5836 av_cold void ff_parse_close(AVCodecParserContext *s)
301 {
302 5836 ParseContext *pc = s->priv_data;
303
304 5836 av_freep(&pc->buffer);
305 5836 }
306