FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/parser.c
Date: 2025-04-25 22:50:00
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/avassert.h"
28 #include "libavutil/mem.h"
29
30 #include "parser.h"
31
32 10580 AVCodecParserContext *av_parser_init(int codec_id)
33 {
34 10580 AVCodecParserContext *s = NULL;
35 const AVCodecParser *parser;
36 10580 void *i = 0;
37 int ret;
38
39
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 10580 if (codec_id == AV_CODEC_ID_NONE)
40 65 return NULL;
41
42
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 500376 while ((parser = av_parser_iterate(&i))) {
43
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 496954 if (parser->codec_ids[0] == codec_id ||
44
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 493825 parser->codec_ids[1] == codec_id ||
45
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 490038 parser->codec_ids[2] == codec_id ||
46
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 489881 parser->codec_ids[3] == codec_id ||
47
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 489873 parser->codec_ids[4] == codec_id ||
48
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 489865 parser->codec_ids[5] == codec_id ||
49
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 489861 parser->codec_ids[6] == codec_id)
50 7093 goto found;
51 }
52 3422 return NULL;
53
54 7093 found:
55 7093 s = av_mallocz(sizeof(AVCodecParserContext));
56
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 7093 if (!s)
57 ✗ goto err_out;
58 7093 s->parser = parser;
59 7093 s->priv_data = av_mallocz(parser->priv_data_size);
60
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 7093 if (!s->priv_data)
61 ✗ goto err_out;
62 7093 s->fetch_timestamp=1;
63 7093 s->pict_type = AV_PICTURE_TYPE_I;
64
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 7093 if (parser->parser_init) {
65 2217 ret = parser->parser_init(s);
66
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 2217 if (ret != 0)
67 ✗ goto err_out;
68 }
69 7093 s->key_frame = -1;
70 7093 s->dts_sync_point = INT_MIN;
71 7093 s->dts_ref_dts_delta = INT_MIN;
72 7093 s->pts_dts_delta = INT_MIN;
73 7093 s->format = -1;
74
75 7093 return s;
76
77 ✗ err_out:
78 ✗ if (s)
79 ✗ av_freep(&s->priv_data);
80 ✗ av_free(s);
81 ✗ return NULL;
82 }
83
84 196538 void ff_fetch_timestamp(AVCodecParserContext *s, int off, int remove, int fuzzy)
85 {
86 int i;
87
88
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 196538 if (!fuzzy) {
89 195711 s->dts =
90 195711 s->pts = AV_NOPTS_VALUE;
91 195711 s->pos = -1;
92 195711 s->offset = 0;
93 }
94
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 631868 for (i = 0; i < AV_PARSER_PTS_NB; i++) {
95
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 575039 if (s->cur_offset + off >= s->cur_frame_offset[i] &&
96
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 565974 (s->frame_offset < s->cur_frame_offset[i] ||
97
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 371746 (!s->frame_offset && !s->next_frame_offset)) && // first field/frame
98 // check disabled since MPEG-TS does not send complete PES packets
99
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 196360 /*s->next_frame_offset + off <*/ s->cur_frame_end[i]){
100
101
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 195282 if (!fuzzy || s->cur_frame_dts[i] != AV_NOPTS_VALUE) {
102 194409 s->dts = s->cur_frame_dts[i];
103 194409 s->pts = s->cur_frame_pts[i];
104 194409 s->pos = s->cur_frame_pos[i];
105 194409 s->offset = s->next_frame_offset - s->cur_frame_offset[i];
106 }
107
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 195282 if (remove)
108 12322 s->cur_frame_offset[i] = INT64_MAX;
109
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 195282 if (s->cur_offset + off < s->cur_frame_end[i])
110 139709 break;
111 }
112 }
113 196538 }
114
115 816398 int av_parser_parse2(AVCodecParserContext *s, AVCodecContext *avctx,
116 uint8_t **poutbuf, int *poutbuf_size,
117 const uint8_t *buf, int buf_size,
118 int64_t pts, int64_t dts, int64_t pos)
119 {
120 int index, i;
121 uint8_t dummy_buf[AV_INPUT_BUFFER_PADDING_SIZE];
122
123 av_assert1(avctx->codec_id != AV_CODEC_ID_NONE);
124
125 /* Parsers only work for the specified codec ids. */
126 av_assert1(avctx->codec_id == s->parser->codec_ids[0] ||
127 avctx->codec_id == s->parser->codec_ids[1] ||
128 avctx->codec_id == s->parser->codec_ids[2] ||
129 avctx->codec_id == s->parser->codec_ids[3] ||
130 avctx->codec_id == s->parser->codec_ids[4] ||
131 avctx->codec_id == s->parser->codec_ids[5] ||
132 avctx->codec_id == s->parser->codec_ids[6]);
133
134
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 816398 if (!(s->flags & PARSER_FLAG_FETCHED_OFFSET)) {
135 3530 s->next_frame_offset =
136 3530 s->cur_offset = pos;
137 3530 s->flags |= PARSER_FLAG_FETCHED_OFFSET;
138 }
139
140
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 816398 if (buf_size == 0) {
141 /* padding is always necessary even if EOF, so we add it here */
142 3274 memset(dummy_buf, 0, sizeof(dummy_buf));
143 3274 buf = dummy_buf;
144
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 813124 } else if (s->cur_offset + buf_size != s->cur_frame_end[s->cur_frame_start_index]) { /* skip remainder packets */
145 /* add a new packet descriptor */
146 697065 i = (s->cur_frame_start_index + 1) & (AV_PARSER_PTS_NB - 1);
147 697065 s->cur_frame_start_index = i;
148 697065 s->cur_frame_offset[i] = s->cur_offset;
149 697065 s->cur_frame_end[i] = s->cur_offset + buf_size;
150 697065 s->cur_frame_pts[i] = pts;
151 697065 s->cur_frame_dts[i] = dts;
152 697065 s->cur_frame_pos[i] = pos;
153 }
154
155
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 816398 if (s->fetch_timestamp) {
156 189531 s->fetch_timestamp = 0;
157 189531 s->last_pts = s->pts;
158 189531 s->last_dts = s->dts;
159 189531 s->last_pos = s->pos;
160 189531 ff_fetch_timestamp(s, 0, 0, 0);
161 }
162 /* WARNING: the returned index can be negative */
163 816398 index = s->parser->parser_parse(s, avctx, (const uint8_t **) poutbuf,
164 poutbuf_size, buf, buf_size);
165
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 816398 av_assert0(index > -0x20000000); // The API does not allow returning AVERROR codes
166 #define FILL(name) if(s->name > 0 && avctx->name <= 0) avctx->name = s->name
167
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 816398 if (avctx->codec_type == AVMEDIA_TYPE_VIDEO) {
168
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 622760 FILL(field_order);
169
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 622760 FILL(coded_width);
170
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 622760 FILL(coded_height);
171
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 622760 FILL(width);
172
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 622760 FILL(height);
173 }
174
175 /* update the file pointer */
176
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 816398 if (*poutbuf_size) {
177 /* fill the data for the current frame */
178 186990 s->frame_offset = s->next_frame_offset;
179
180 /* offset of the next frame */
181 186990 s->next_frame_offset = s->cur_offset + index;
182 186990 s->fetch_timestamp = 1;
183 } else {
184 /* Don't return a pointer to dummy_buf. */
185 629408 *poutbuf = NULL;
186 }
187
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 816398 if (index < 0)
188 4845 index = 0;
189 816398 s->cur_offset += index;
190 816398 return index;
191 }
192
193 20629 void av_parser_close(AVCodecParserContext *s)
194 {
195
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 20629 if (s) {
196
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 7093 if (s->parser->parser_close)
197 6752 s->parser->parser_close(s);
198 7093 av_freep(&s->priv_data);
199 7093 av_free(s);
200 }
201 20629 }
202
203 754827 int ff_combine_frame(ParseContext *pc, int next,
204 const uint8_t **buf, int *buf_size)
205 {
206 754827 if (pc->overread) {
207 ff_dlog(NULL, "overread %d, state:%"PRIX32" next:%d index:%d o_index:%d\n",
208 pc->overread, pc->state, next, pc->index, pc->overread_index);
209 ff_dlog(NULL, "%X %X %X %X\n",
210 (*buf)[0], (*buf)[1], (*buf)[2], (*buf)[3]);
211 }
212
213 /* Copy overread bytes from last frame into buffer. */
214
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 756196 for (; pc->overread > 0; pc->overread--)
215 1369 pc->buffer[pc->index++] = pc->buffer[pc->overread_index++];
216
217
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 754827 if (next > *buf_size)
218 ✗ return AVERROR(EINVAL);
219
220 /* flush remaining if EOF */
221
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 754827 if (!*buf_size && next == END_NOT_FOUND)
222 1707 next = 0;
223
224 754827 pc->last_index = pc->index;
225
226 /* copy into buffer end return */
227
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 754827 if (next == END_NOT_FOUND) {
228 619201 void *new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size,
229 619201 *buf_size + pc->index +
230 AV_INPUT_BUFFER_PADDING_SIZE);
231
232
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 619201 if (!new_buffer) {
233 ✗ av_log(NULL, AV_LOG_ERROR, "Failed to reallocate parser buffer to %d\n", *buf_size + pc->index + AV_INPUT_BUFFER_PADDING_SIZE);
234 ✗ pc->index = 0;
235 ✗ return AVERROR(ENOMEM);
236 }
237 619201 pc->buffer = new_buffer;
238 619201 memcpy(&pc->buffer[pc->index], *buf, *buf_size);
239 619201 memset(&pc->buffer[pc->index + *buf_size], 0, AV_INPUT_BUFFER_PADDING_SIZE);
240 619201 pc->index += *buf_size;
241 619201 return -1;
242 }
243
244
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 135626 av_assert0(next >= 0 || pc->buffer);
245
246 135626 *buf_size =
247 135626 pc->overread_index = pc->index + next;
248
249 /* append to buffer */
250
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 135626 if (pc->index) {
251 60308 void *new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size,
252 60308 next + pc->index +
253 AV_INPUT_BUFFER_PADDING_SIZE);
254
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 60308 if (!new_buffer) {
255 ✗ av_log(NULL, AV_LOG_ERROR, "Failed to reallocate parser buffer to %d\n", next + pc->index + AV_INPUT_BUFFER_PADDING_SIZE);
256 ✗ *buf_size =
257 ✗ pc->overread_index =
258 ✗ pc->index = 0;
259 ✗ return AVERROR(ENOMEM);
260 }
261 60308 pc->buffer = new_buffer;
262
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 60308 if (next > -AV_INPUT_BUFFER_PADDING_SIZE)
263 60303 memcpy(&pc->buffer[pc->index], *buf,
264 60303 next + AV_INPUT_BUFFER_PADDING_SIZE);
265 60308 pc->index = 0;
266 60308 *buf = pc->buffer;
267 }
268
269
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 135626 if (next < -8) {
270 38 pc->overread += -8 - next;
271 38 next = -8;
272 }
273 /* store overread bytes */
274
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 136600 for (; next < 0; next++) {
275 974 pc->state = pc->state << 8 | pc->buffer[pc->last_index + next];
276 974 pc->state64 = pc->state64 << 8 | pc->buffer[pc->last_index + next];
277 974 pc->overread++;
278 }
279
280 135626 if (pc->overread) {
281 ff_dlog(NULL, "overread %d, state:%"PRIX32" next:%d index:%d o_index:%d\n",
282 pc->overread, pc->state, next, pc->index, pc->overread_index);
283 ff_dlog(NULL, "%X %X %X %X\n",
284 (*buf)[0], (*buf)[1], (*buf)[2], (*buf)[3]);
285 }
286
287 135626 return 0;
288 }
289
290 5476 void ff_parse_close(AVCodecParserContext *s)
291 {
292 5476 ParseContext *pc = s->priv_data;
293
294 5476 av_freep(&pc->buffer);
295 5476 }
296