FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/parser.c
Date: 2022-07-04 19:11:22
Exec Total Coverage
Lines: 137 153 89.5%
Branches: 89 100 89.0%

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 9327 AVCodecParserContext *av_parser_init(int codec_id)
33 {
34 9327 AVCodecParserContext *s = NULL;
35 const AVCodecParser *parser;
36 9327 void *i = 0;
37 int ret;
38
39
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9327 if (codec_id == AV_CODEC_ID_NONE)
40 61 return NULL;
41
42
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385535 while ((parser = av_parser_iterate(&i))) {
43
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382303 if (parser->codec_ids[0] == codec_id ||
44
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379700 parser->codec_ids[1] == codec_id ||
45
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376440 parser->codec_ids[2] == codec_id ||
46
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376289 parser->codec_ids[3] == codec_id ||
47
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376281 parser->codec_ids[4] == codec_id ||
48
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376273 parser->codec_ids[5] == codec_id ||
49
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376269 parser->codec_ids[6] == codec_id)
50 6034 goto found;
51 }
52 3232 return NULL;
53
54 6034 found:
55 6034 s = av_mallocz(sizeof(AVCodecParserContext));
56
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6034 if (!s)
57 goto err_out;
58 6034 s->parser = parser;
59 6034 s->priv_data = av_mallocz(parser->priv_data_size);
60
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6034 if (!s->priv_data)
61 goto err_out;
62 6034 s->fetch_timestamp=1;
63 6034 s->pict_type = AV_PICTURE_TYPE_I;
64
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6034 if (parser->parser_init) {
65 1941 ret = parser->parser_init(s);
66
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1941 if (ret != 0)
67 goto err_out;
68 }
69 6034 s->key_frame = -1;
70 6034 s->dts_sync_point = INT_MIN;
71 6034 s->dts_ref_dts_delta = INT_MIN;
72 6034 s->pts_dts_delta = INT_MIN;
73 6034 s->format = -1;
74
75 6034 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 158887 void ff_fetch_timestamp(AVCodecParserContext *s, int off, int remove, int fuzzy)
85 {
86 int i;
87
88
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158887 if (!fuzzy) {
89 158104 s->dts =
90 158104 s->pts = AV_NOPTS_VALUE;
91 158104 s->pos = -1;
92 158104 s->offset = 0;
93 }
94
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497133 for (i = 0; i < AV_PARSER_PTS_NB; i++) {
95
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456702 if (s->cur_offset + off >= s->cur_frame_offset[i] &&
96
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447708 (s->frame_offset < s->cur_frame_offset[i] ||
97
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284992 (!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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164478 /*s->next_frame_offset + off <*/ s->cur_frame_end[i]){
100
101
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163585 if (!fuzzy || s->cur_frame_dts[i] != AV_NOPTS_VALUE) {
102 162752 s->dts = s->cur_frame_dts[i];
103 162752 s->pts = s->cur_frame_pts[i];
104 162752 s->pos = s->cur_frame_pos[i];
105 162752 s->offset = s->next_frame_offset - s->cur_frame_offset[i];
106 }
107
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163585 if (remove)
108 10934 s->cur_frame_offset[i] = INT64_MAX;
109
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163585 if (s->cur_offset + off < s->cur_frame_end[i])
110 118456 break;
111 }
112 }
113 158887 }
114
115 676842 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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676842 if (!(s->flags & PARSER_FLAG_FETCHED_OFFSET)) {
135 3153 s->next_frame_offset =
136 3153 s->cur_offset = pos;
137 3153 s->flags |= PARSER_FLAG_FETCHED_OFFSET;
138 }
139
140
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676842 if (buf_size == 0) {
141 /* padding is always necessary even if EOF, so we add it here */
142 2760 memset(dummy_buf, 0, sizeof(dummy_buf));
143 2760 buf = dummy_buf;
144
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674082 } 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 586837 i = (s->cur_frame_start_index + 1) & (AV_PARSER_PTS_NB - 1);
147 586837 s->cur_frame_start_index = i;
148 586837 s->cur_frame_offset[i] = s->cur_offset;
149 586837 s->cur_frame_end[i] = s->cur_offset + buf_size;
150 586837 s->cur_frame_pts[i] = pts;
151 586837 s->cur_frame_dts[i] = dts;
152 586837 s->cur_frame_pos[i] = pos;
153 }
154
155
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676842 if (s->fetch_timestamp) {
156 152482 s->fetch_timestamp = 0;
157 152482 s->last_pts = s->pts;
158 152482 s->last_dts = s->dts;
159 152482 s->last_pos = s->pos;
160 152482 ff_fetch_timestamp(s, 0, 0, 0);
161 }
162 /* WARNING: the returned index can be negative */
163 676842 index = s->parser->parser_parse(s, avctx, (const uint8_t **) poutbuf,
164 poutbuf_size, buf, buf_size);
165
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676842 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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676842 if (avctx->codec_type == AVMEDIA_TYPE_VIDEO) {
168
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533230 FILL(field_order);
169 }
170
171 /* update the file pointer */
172
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676842 if (*poutbuf_size) {
173 /* fill the data for the current frame */
174 150284 s->frame_offset = s->next_frame_offset;
175
176 /* offset of the next frame */
177 150284 s->next_frame_offset = s->cur_offset + index;
178 150284 s->fetch_timestamp = 1;
179 } else {
180 /* Don't return a pointer to dummy_buf. */
181 526558 *poutbuf = NULL;
182 }
183
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676842 if (index < 0)
184 4180 index = 0;
185 676842 s->cur_offset += index;
186 676842 return index;
187 }
188
189 16825 void av_parser_close(AVCodecParserContext *s)
190 {
191
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16825 if (s) {
192
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6034 if (s->parser->parser_close)
193 5723 s->parser->parser_close(s);
194 6034 av_freep(&s->priv_data);
195 6034 av_free(s);
196 }
197 16825 }
198
199 627078 int ff_combine_frame(ParseContext *pc, int next,
200 const uint8_t **buf, int *buf_size)
201 {
202 627078 if (pc->overread) {
203 ff_dlog(NULL, "overread %d, state:%"PRIX32" next:%d index:%d o_index:%d\n",
204 pc->overread, pc->state, next, pc->index, pc->overread_index);
205 ff_dlog(NULL, "%X %X %X %X\n",
206 (*buf)[0], (*buf)[1], (*buf)[2], (*buf)[3]);
207 }
208
209 /* Copy overread bytes from last frame into buffer. */
210
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627544 for (; pc->overread > 0; pc->overread--)
211 466 pc->buffer[pc->index++] = pc->buffer[pc->overread_index++];
212
213
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627078 if (next > *buf_size)
214 return AVERROR(EINVAL);
215
216 /* flush remaining if EOF */
217
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627078 if (!*buf_size && next == END_NOT_FOUND)
218 1418 next = 0;
219
220 627078 pc->last_index = pc->index;
221
222 /* copy into buffer end return */
223
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627078 if (next == END_NOT_FOUND) {
224 521304 void *new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size,
225 521304 *buf_size + pc->index +
226 AV_INPUT_BUFFER_PADDING_SIZE);
227
228
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521304 if (!new_buffer) {
229 av_log(NULL, AV_LOG_ERROR, "Failed to reallocate parser buffer to %d\n", *buf_size + pc->index + AV_INPUT_BUFFER_PADDING_SIZE);
230 pc->index = 0;
231 return AVERROR(ENOMEM);
232 }
233 521304 pc->buffer = new_buffer;
234 521304 memcpy(&pc->buffer[pc->index], *buf, *buf_size);
235 521304 pc->index += *buf_size;
236 521304 return -1;
237 }
238
239
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105774 av_assert0(next >= 0 || pc->buffer);
240
241 105774 *buf_size =
242 105774 pc->overread_index = pc->index + next;
243
244 /* append to buffer */
245
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105774 if (pc->index) {
246 47733 void *new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size,
247 47733 next + pc->index +
248 AV_INPUT_BUFFER_PADDING_SIZE);
249
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47733 if (!new_buffer) {
250 av_log(NULL, AV_LOG_ERROR, "Failed to reallocate parser buffer to %d\n", next + pc->index + AV_INPUT_BUFFER_PADDING_SIZE);
251 pc->overread_index =
252 pc->index = 0;
253 return AVERROR(ENOMEM);
254 }
255 47733 pc->buffer = new_buffer;
256
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47733 if (next > -AV_INPUT_BUFFER_PADDING_SIZE)
257 47729 memcpy(&pc->buffer[pc->index], *buf,
258 47729 next + AV_INPUT_BUFFER_PADDING_SIZE);
259 47733 pc->index = 0;
260 47733 *buf = pc->buffer;
261 }
262
263
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105774 if (next < -8) {
264 37 pc->overread += -8 - next;
265 37 next = -8;
266 }
267 /* store overread bytes */
268
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106536 for (; next < 0; next++) {
269 762 pc->state = pc->state << 8 | pc->buffer[pc->last_index + next];
270 762 pc->state64 = pc->state64 << 8 | pc->buffer[pc->last_index + next];
271 762 pc->overread++;
272 }
273
274 105774 if (pc->overread) {
275 ff_dlog(NULL, "overread %d, state:%"PRIX32" next:%d index:%d o_index:%d\n",
276 pc->overread, pc->state, next, pc->index, pc->overread_index);
277 ff_dlog(NULL, "%X %X %X %X\n",
278 (*buf)[0], (*buf)[1], (*buf)[2], (*buf)[3]);
279 }
280
281 105774 return 0;
282 }
283
284 4797 void ff_parse_close(AVCodecParserContext *s)
285 {
286 4797 ParseContext *pc = s->priv_data;
287
288 4797 av_freep(&pc->buffer);
289 4797 }
290