FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/format.c
Date: 2022-12-05 03:11:11
Exec Total Coverage
Lines: 148 173 85.5%
Functions: 8 9 88.9%
Branches: 115 144 79.9%

Line Branch Exec Source
1 /*
2 * Format register and lookup
3 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "config_components.h"
23
24 #include "libavutil/avstring.h"
25 #include "libavutil/bprint.h"
26 #include "libavutil/opt.h"
27 #include "libavutil/thread.h"
28
29 #include "avio_internal.h"
30 #include "avformat.h"
31 #include "id3v2.h"
32 #include "internal.h"
33
34
35 /**
36 * @file
37 * Format register and lookup
38 */
39
40 1075668 int av_match_ext(const char *filename, const char *extensions)
41 {
42 const char *ext;
43
44
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1075668 if (!filename)
45 445380 return 0;
46
47 630288 ext = strrchr(filename, '.');
48
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630288 if (ext)
49 625299 return av_match_name(ext + 1, extensions);
50 4989 return 0;
51 }
52
53 6564 const AVOutputFormat *av_guess_format(const char *short_name, const char *filename,
54 const char *mime_type)
55 {
56 6564 const AVOutputFormat *fmt = NULL;
57 6564 const AVOutputFormat *fmt_found = NULL;
58 6564 void *i = 0;
59 int score_max, score;
60
61 /* specific test for image sequences */
62 #if CONFIG_IMAGE2_MUXER
63
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6741 if (!short_name && filename &&
64
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233 av_filename_number_test(filename) &&
65 56 ff_guess_image2_codec(filename) != AV_CODEC_ID_NONE) {
66 51 return av_guess_format("image2", NULL, NULL);
67 }
68 #endif
69 /* Find the proper file type. */
70 6513 score_max = 0;
71
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1178643 while ((fmt = av_muxer_iterate(&i))) {
72 1172130 score = 0;
73
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1172130 if (fmt->name && short_name && av_match_name(short_name, fmt->name))
74 6414 score += 100;
75
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1172130 if (fmt->mime_type && mime_type && !strcmp(fmt->mime_type, mime_type))
76 score += 10;
77
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1189026 if (filename && fmt->extensions &&
78 16896 av_match_ext(filename, fmt->extensions)) {
79 138 score += 5;
80 }
81
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1172130 if (score > score_max) {
82 6513 score_max = score;
83 6513 fmt_found = fmt;
84 }
85 }
86 6513 return fmt_found;
87 }
88
89 21408 enum AVCodecID av_guess_codec(const AVOutputFormat *fmt, const char *short_name,
90 const char *filename, const char *mime_type,
91 enum AVMediaType type)
92 {
93
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21408 if (av_match_name("segment", fmt->name) || av_match_name("ssegment", fmt->name)) {
94 const AVOutputFormat *fmt2 = av_guess_format(NULL, filename, NULL);
95 if (fmt2)
96 fmt = fmt2;
97 }
98
99
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21408 if (type == AVMEDIA_TYPE_VIDEO) {
100 8269 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
101
102 #if CONFIG_IMAGE2_MUXER || CONFIG_IMAGE2PIPE_MUXER
103
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8269 if (!strcmp(fmt->name, "image2") || !strcmp(fmt->name, "image2pipe")) {
104 121 codec_id = ff_guess_image2_codec(filename);
105 }
106 #endif
107
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8269 if (codec_id == AV_CODEC_ID_NONE)
108 8151 codec_id = fmt->video_codec;
109 8269 return codec_id;
110
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13139 } else if (type == AVMEDIA_TYPE_AUDIO)
111 6765 return fmt->audio_codec;
112
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6374 else if (type == AVMEDIA_TYPE_SUBTITLE)
113 29 return fmt->subtitle_codec;
114
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6345 else if (type == AVMEDIA_TYPE_DATA)
115 6345 return fmt->data_codec;
116 else
117 return AV_CODEC_ID_NONE;
118 }
119
120 3230 const AVInputFormat *av_find_input_format(const char *short_name)
121 {
122 3230 const AVInputFormat *fmt = NULL;
123 3230 void *i = 0;
124
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469976 while ((fmt = av_demuxer_iterate(&i)))
125
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469976 if (av_match_name(short_name, fmt->name))
126 3230 return fmt;
127 return NULL;
128 }
129
130 10381 const AVInputFormat *av_probe_input_format3(const AVProbeData *pd,
131 int is_opened, int *score_ret)
132 {
133 10381 AVProbeData lpd = *pd;
134 10381 const AVInputFormat *fmt1 = NULL;
135 10381 const AVInputFormat *fmt = NULL;
136 10381 int score, score_max = 0;
137 10381 void *i = 0;
138 const static uint8_t zerobuffer[AVPROBE_PADDING_SIZE];
139 enum nodat {
140 NO_ID3,
141 ID3_ALMOST_GREATER_PROBE,
142 ID3_GREATER_PROBE,
143 ID3_GREATER_MAX_PROBE,
144 10381 } nodat = NO_ID3;
145
146
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10381 if (!lpd.buf)
147 3599 lpd.buf = (unsigned char *) zerobuffer;
148
149
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10381 if (lpd.buf_size > 10 && ff_id3v2_match(lpd.buf, ID3v2_DEFAULT_MAGIC)) {
150 51 int id3len = ff_id3v2_tag_len(lpd.buf);
151
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51 if (lpd.buf_size > id3len + 16) {
152
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30 if (lpd.buf_size < 2LL*id3len + 16)
153 13 nodat = ID3_ALMOST_GREATER_PROBE;
154 30 lpd.buf += id3len;
155 30 lpd.buf_size -= id3len;
156
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21 } else if (id3len >= PROBE_BUF_MAX) {
157 nodat = ID3_GREATER_MAX_PROBE;
158 } else
159 21 nodat = ID3_GREATER_PROBE;
160 }
161
162
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3579663 while ((fmt1 = av_demuxer_iterate(&i))) {
163
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3569282 if (fmt1->flags & AVFMT_EXPERIMENTAL)
164 continue;
165
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3569282 if (!is_opened == !(fmt1->flags & AVFMT_NOFILE) && strcmp(fmt1->name, "image2"))
166 1262102 continue;
167 2307180 score = 0;
168
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2307180 if (fmt1->read_probe) {
169 1957517 score = fmt1->read_probe(&lpd);
170
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1957517 if (score)
171 6608 av_log(NULL, AV_LOG_TRACE, "Probing %s score:%d size:%d\n", fmt1->name, score, lpd.buf_size);
172
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1957517 if (fmt1->extensions && av_match_ext(lpd.filename, fmt1->extensions)) {
173
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2168 switch (nodat) {
174 2138 case NO_ID3:
175 2138 score = FFMAX(score, 1);
176 2138 break;
177 30 case ID3_GREATER_PROBE:
178 case ID3_ALMOST_GREATER_PROBE:
179 30 score = FFMAX(score, AVPROBE_SCORE_EXTENSION / 2 - 1);
180 30 break;
181 case ID3_GREATER_MAX_PROBE:
182 score = FFMAX(score, AVPROBE_SCORE_EXTENSION);
183 break;
184 }
185 }
186
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349663 } else if (fmt1->extensions) {
187
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183114 if (av_match_ext(lpd.filename, fmt1->extensions))
188 26 score = AVPROBE_SCORE_EXTENSION;
189 }
190
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2307180 if (av_match_name(lpd.mime_type, fmt1->mime_type)) {
191 if (AVPROBE_SCORE_MIME > score) {
192 av_log(NULL, AV_LOG_DEBUG, "Probing %s score:%d increased to %d due to MIME type\n", fmt1->name, score, AVPROBE_SCORE_MIME);
193 score = AVPROBE_SCORE_MIME;
194 }
195 }
196
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2307180 if (score > score_max) {
197 6051 score_max = score;
198 6051 fmt = fmt1;
199
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2301129 } else if (score == score_max)
200 1228087 fmt = NULL;
201 }
202
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10381 if (nodat == ID3_GREATER_PROBE)
203 21 score_max = FFMIN(AVPROBE_SCORE_EXTENSION / 2 - 1, score_max);
204 10381 *score_ret = score_max;
205
206 10381 return fmt;
207 }
208
209 7526 const AVInputFormat *av_probe_input_format2(const AVProbeData *pd,
210 int is_opened, int *score_max)
211 {
212 int score_ret;
213 7526 const AVInputFormat *fmt = av_probe_input_format3(pd, is_opened, &score_ret);
214
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7526 if (score_ret > *score_max) {
215 3611 *score_max = score_ret;
216 3611 return fmt;
217 } else
218 3915 return NULL;
219 }
220
221 const AVInputFormat *av_probe_input_format(const AVProbeData *pd, int is_opened)
222 {
223 int score = 0;
224 return av_probe_input_format2(pd, is_opened, &score);
225 }
226
227 3423 int av_probe_input_buffer2(AVIOContext *pb, const AVInputFormat **fmt,
228 const char *filename, void *logctx,
229 unsigned int offset, unsigned int max_probe_size)
230 {
231
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3423 AVProbeData pd = { filename ? filename : "" };
232 3423 uint8_t *buf = NULL;
233 3423 int ret = 0, probe_size, buf_offset = 0;
234 3423 int score = 0;
235 int ret2;
236
237
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3423 if (!max_probe_size)
238 12 max_probe_size = PROBE_BUF_MAX;
239
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3411 else if (max_probe_size < PROBE_BUF_MIN) {
240 av_log(logctx, AV_LOG_ERROR,
241 "Specified probe size value %u cannot be < %u\n", max_probe_size, PROBE_BUF_MIN);
242 return AVERROR(EINVAL);
243 }
244
245
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3423 if (offset >= max_probe_size)
246 return AVERROR(EINVAL);
247
248
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3423 if (pb->av_class) {
249 3411 uint8_t *mime_type_opt = NULL;
250 char *semi;
251 3411 av_opt_get(pb, "mime_type", AV_OPT_SEARCH_CHILDREN, &mime_type_opt);
252 3411 pd.mime_type = (const char *)mime_type_opt;
253
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3411 semi = pd.mime_type ? strchr(pd.mime_type, ';') : NULL;
254
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3411 if (semi) {
255 *semi = '\0';
256 }
257 }
258
259
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7350 for (probe_size = PROBE_BUF_MIN; probe_size <= max_probe_size && !*fmt;
260 3927 probe_size = FFMIN(probe_size << 1,
261 FFMAX(max_probe_size, probe_size + 1))) {
262
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3927 score = probe_size < max_probe_size ? AVPROBE_SCORE_RETRY : 0;
263
264 /* Read probe data. */
265
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3927 if ((ret = av_reallocp(&buf, probe_size + AVPROBE_PADDING_SIZE)) < 0)
266 goto fail;
267
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3927 if ((ret = avio_read(pb, buf + buf_offset,
268 probe_size - buf_offset)) < 0) {
269 /* Fail if error was not end of file, otherwise, lower score. */
270
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10 if (ret != AVERROR_EOF)
271 goto fail;
272
273 10 score = 0;
274 10 ret = 0; /* error was end of file, nothing read */
275 }
276 3927 buf_offset += ret;
277
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3927 if (buf_offset < offset)
278 continue;
279 3927 pd.buf_size = buf_offset - offset;
280 3927 pd.buf = &buf[offset];
281
282 3927 memset(pd.buf + pd.buf_size, 0, AVPROBE_PADDING_SIZE);
283
284 /* Guess file format. */
285 3927 *fmt = av_probe_input_format2(&pd, 1, &score);
286
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3927 if (*fmt) {
287 /* This can only be true in the last iteration. */
288
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3423 if (score <= AVPROBE_SCORE_RETRY) {
289 11 av_log(logctx, AV_LOG_WARNING,
290 "Format %s detected only with low score of %d, "
291 11 "misdetection possible!\n", (*fmt)->name, score);
292 } else
293 3412 av_log(logctx, AV_LOG_DEBUG,
294 "Format %s probed with size=%d and score=%d\n",
295 3412 (*fmt)->name, probe_size, score);
296 #if 0
297 FILE *f = fopen("probestat.tmp", "ab");
298 fprintf(f, "probe_size:%d format:%s score:%d filename:%s\n", probe_size, (*fmt)->name, score, filename);
299 fclose(f);
300 #endif
301 }
302 }
303
304
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3423 if (!*fmt)
305 ret = AVERROR_INVALIDDATA;
306
307 3423 fail:
308 /* Rewind. Reuse probe buffer to avoid seeking. */
309 3423 ret2 = ffio_rewind_with_probe_data(pb, &buf, buf_offset);
310
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3423 if (ret >= 0)
311 3423 ret = ret2;
312
313 3423 av_freep(&pd.mime_type);
314
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3423 return ret < 0 ? ret : score;
315 }
316
317 12 int av_probe_input_buffer(AVIOContext *pb, const AVInputFormat **fmt,
318 const char *filename, void *logctx,
319 unsigned int offset, unsigned int max_probe_size)
320 {
321 12 int ret = av_probe_input_buffer2(pb, fmt, filename, logctx, offset, max_probe_size);
322 12 return ret < 0 ? ret : 0;
323 }
324