FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/parser.c
Date: 2025-09-19 19:05:09
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 10777 av_cold AVCodecParserContext *av_parser_init(int codec_id)
34 {
35 10777 AVCodecParserContext *s = NULL;
36 const AVCodecParser *parser;
37 10777 void *i = 0;
38 int ret;
39
40
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 10777 if (codec_id == AV_CODEC_ID_NONE)
41 64 return NULL;
42
43
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 524510 while ((parser = av_parser_iterate(&i))) {
44
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 521024 if (parser->codec_ids[0] == codec_id ||
45
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 517860 parser->codec_ids[1] == codec_id ||
46
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 513974 parser->codec_ids[2] == codec_id ||
47
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 513817 parser->codec_ids[3] == codec_id ||
48
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 513809 parser->codec_ids[4] == codec_id ||
49
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 513801 parser->codec_ids[5] == codec_id ||
50
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 513797 parser->codec_ids[6] == codec_id)
51 7227 goto found;
52 }
53 3486 return NULL;
54
55 7227 found:
56 7227 s = av_mallocz(sizeof(AVCodecParserContext));
57
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 7227 if (!s)
58 ✗ goto err_out;
59 7227 s->parser = parser;
60 7227 s->priv_data = av_mallocz(parser->priv_data_size);
61
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 7227 if (!s->priv_data)
62 ✗ goto err_out;
63 7227 s->fetch_timestamp=1;
64 7227 s->pict_type = AV_PICTURE_TYPE_I;
65
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 7227 if (parser->parser_init) {
66 2237 ret = parser->parser_init(s);
67
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 2237 if (ret != 0)
68 ✗ goto err_out;
69 }
70 7227 s->key_frame = -1;
71 7227 s->dts_sync_point = INT_MIN;
72 7227 s->dts_ref_dts_delta = INT_MIN;
73 7227 s->pts_dts_delta = INT_MIN;
74 7227 s->format = -1;
75
76 7227 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 197271 void ff_fetch_timestamp(AVCodecParserContext *s, int off, int remove, int fuzzy)
86 {
87 int i;
88
89
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 197271 if (!fuzzy) {
90 196438 s->dts =
91 196438 s->pts = AV_NOPTS_VALUE;
92 196438 s->pos = -1;
93 196438 s->offset = 0;
94 }
95
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 633889 for (i = 0; i < AV_PARSER_PTS_NB; i++) {
96
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 576985 if (s->cur_offset + off >= s->cur_frame_offset[i] &&
97
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 567250 (s->frame_offset < s->cur_frame_offset[i] ||
98
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 372174 (!s->frame_offset && !s->next_frame_offset)) && // first field/frame
99 // check disabled since MPEG-TS does not send complete PES packets
100
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 197240 /*s->next_frame_offset + off <*/ s->cur_frame_end[i]){
101
102
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 196146 if (!fuzzy || s->cur_frame_dts[i] != AV_NOPTS_VALUE) {
103 195273 s->dts = s->cur_frame_dts[i];
104 195273 s->pts = s->cur_frame_pts[i];
105 195273 s->pos = s->cur_frame_pos[i];
106 195273 s->offset = s->next_frame_offset - s->cur_frame_offset[i];
107 }
108
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 196146 if (remove)
109 12551 s->cur_frame_offset[i] = INT64_MAX;
110
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 196146 if (s->cur_offset + off < s->cur_frame_end[i])
111 140367 break;
112 }
113 }
114 197271 }
115
116 821335 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
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 821335 if (!(s->flags & PARSER_FLAG_FETCHED_OFFSET)) {
136 3551 s->next_frame_offset =
137 3551 s->cur_offset = pos;
138 3551 s->flags |= PARSER_FLAG_FETCHED_OFFSET;
139 }
140
141
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 821335 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
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 818032 } 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 701522 i = (s->cur_frame_start_index + 1) & (AV_PARSER_PTS_NB - 1);
148 701522 s->cur_frame_start_index = i;
149 701522 s->cur_frame_offset[i] = s->cur_offset;
150 701522 s->cur_frame_end[i] = s->cur_offset + buf_size;
151 701522 s->cur_frame_pts[i] = pts;
152 701522 s->cur_frame_dts[i] = dts;
153 701522 s->cur_frame_pos[i] = pos;
154 }
155
156
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 821335 if (s->fetch_timestamp) {
157 190037 s->fetch_timestamp = 0;
158 190037 s->last_pts = s->pts;
159 190037 s->last_dts = s->dts;
160 190037 s->last_pos = s->pos;
161 190037 ff_fetch_timestamp(s, 0, 0, 0);
162 }
163 /* WARNING: the returned index can be negative */
164 821335 index = s->parser->parser_parse(s, avctx, (const uint8_t **) poutbuf,
165 poutbuf_size, buf, buf_size);
166
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 821335 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
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 821335 if (avctx->codec_type == AVMEDIA_TYPE_VIDEO) {
169
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 627653 FILL(field_order);
170
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 627653 FILL(coded_width);
171
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 627653 FILL(coded_height);
172
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 627653 FILL(width);
173
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 627653 FILL(height);
174 }
175
176 /* update the file pointer */
177
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 821335 if (*poutbuf_size) {
178 /* fill the data for the current frame */
179 187474 s->frame_offset = s->next_frame_offset;
180
181 /* offset of the next frame */
182 187474 s->next_frame_offset = s->cur_offset + index;
183 187474 s->fetch_timestamp = 1;
184 } else {
185 /* Don't return a pointer to dummy_buf. */
186 633861 *poutbuf = NULL;
187 }
188
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 821335 if (index < 0)
189 4858 index = 0;
190 821335 s->cur_offset += index;
191 821335 return index;
192 }
193
194 21037 av_cold void av_parser_close(AVCodecParserContext *s)
195 {
196
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 21037 if (s) {
197
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 7227 if (s->parser->parser_close)
198 6886 s->parser->parser_close(s);
199 7227 av_freep(&s->priv_data);
200 7227 av_free(s);
201 }
202 21037 }
203
204 759743 int ff_combine_frame(ParseContext *pc, int next,
205 const uint8_t **buf, int *buf_size)
206 {
207 759743 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
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 761113 for (; pc->overread > 0; pc->overread--)
216 1370 pc->buffer[pc->index++] = pc->buffer[pc->overread_index++];
217
218
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 759743 if (next > *buf_size)
219 ✗ return AVERROR(EINVAL);
220
221 /* flush remaining if EOF */
222
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 759743 if (!*buf_size && next == END_NOT_FOUND)
223 1719 next = 0;
224
225 759743 pc->last_index = pc->index;
226
227 /* copy into buffer end return */
228
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 759743 if (next == END_NOT_FOUND) {
229 623634 void *new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size,
230 623634 *buf_size + pc->index +
231 AV_INPUT_BUFFER_PADDING_SIZE);
232
233
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 623634 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 623634 pc->buffer = new_buffer;
239 623634 memcpy(&pc->buffer[pc->index], *buf, *buf_size);
240 623634 memset(&pc->buffer[pc->index + *buf_size], 0, AV_INPUT_BUFFER_PADDING_SIZE);
241 623634 pc->index += *buf_size;
242 623634 return -1;
243 }
244
245
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 136109 av_assert0(next >= 0 || pc->buffer);
246
247 136109 *buf_size =
248 136109 pc->overread_index = pc->index + next;
249
250 /* append to buffer */
251
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 136109 if (pc->index) {
252 60715 void *new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size,
253 60715 next + pc->index +
254 AV_INPUT_BUFFER_PADDING_SIZE);
255
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 60715 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 60715 pc->buffer = new_buffer;
263
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 60715 if (next > -AV_INPUT_BUFFER_PADDING_SIZE)
264 60710 memcpy(&pc->buffer[pc->index], *buf,
265 60710 next + AV_INPUT_BUFFER_PADDING_SIZE);
266 60715 pc->index = 0;
267 60715 *buf = pc->buffer;
268 }
269
270
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 136109 if (next < -8) {
271 38 pc->overread += -8 - next;
272 38 next = -8;
273 }
274 /* store overread bytes */
275
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 137084 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 136109 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 136109 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