FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/format.c
Date: 2026-08-28 18:35:09
Exec Total Coverage
Lines: 161 191 84.3%
Functions: 9 10 90.0%
Branches: 121 162 74.7%
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/mem.h"
26 #include "libavutil/opt.h"
27
28 #include "avio_internal.h"
29 #include "avformat.h"
30 #include "demux.h"
31 #include "id3v2.h"
32 #include "internal.h"
33 #include "url.h"
34
35
36 /**
37 * @file
38 * Format register and lookup
39 */
40
41 1423503 int av_match_ext(const char *filename, const char *extensions)
42 {
43 const char *ext;
44
45
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 1423503 if (!filename)
46 593120 return 0;
47
48 830383 ext = strrchr(filename, '.');
49
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 830383 if (ext)
50 823402 return av_match_name(ext + 1, extensions);
51 6981 return 0;
52 }
53
54 241 int ff_match_url_ext(const char *url, const char *extensions)
55 {
56 const char *ext;
57 URLComponents uc;
58 int ret;
59 char scratchpad[128];
60
61
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 241 if (!url)
62 ✗ return 0;
63
64 241 ret = ff_url_decompose(&uc, url, NULL);
65
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 241 if (ret < 0 || !URL_COMPONENT_HAVE(uc, scheme))
66 241 return ret;
67 ✗ for (ext = uc.query; *ext != '.' && ext > uc.path; ext--)
68 ;
69
70 ✗ if (*ext != '.')
71 ✗ return 0;
72 ✗ if (uc.query - ext > sizeof(scratchpad))
73 ✗ return AVERROR(ENOMEM); //not enough memory in our scratchpad
74 ✗ av_strlcpy(scratchpad, ext + 1, uc.query - ext);
75
76 ✗ return av_match_name(scratchpad, extensions);
77 }
78
79 8859 const AVOutputFormat *av_guess_format(const char *short_name, const char *filename,
80 const char *mime_type)
81 {
82 8859 const AVOutputFormat *fmt = NULL;
83 8859 const AVOutputFormat *fmt_found = NULL;
84 8859 void *i = 0;
85 int score_max, score;
86
87 /* specific test for image sequences */
88 #if CONFIG_IMAGE2_MUXER
89
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 9071 if (!short_name && filename &&
90
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 269 av_filename_number_test(filename) &&
91 57 ff_guess_image2_codec(filename) != AV_CODEC_ID_NONE) {
92 52 return av_guess_format("image2", NULL, NULL);
93 }
94 #endif
95 /* Find the proper file type. */
96 8807 score_max = 0;
97
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 1673170 while ((fmt = av_muxer_iterate(&i))) {
98
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 1664363 if (fmt->flags & AVFMT_EXPERIMENTAL && !short_name)
99 ✗ continue;
100 1664363 score = 0;
101
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 1664363 if (fmt->name && short_name && av_match_name(short_name, fmt->name))
102 8682 score += 100;
103
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 1664363 if (fmt->mime_type && mime_type && !strcmp(fmt->mime_type, mime_type))
104 ✗ score += 10;
105
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 1686557 if (filename && fmt->extensions &&
106 22194 av_match_ext(filename, fmt->extensions)) {
107 177 score += 5;
108 }
109
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 1664363 if (score > score_max) {
110 8807 score_max = score;
111 8807 fmt_found = fmt;
112 }
113 }
114 8807 return fmt_found;
115 }
116
117 28178 enum AVCodecID av_guess_codec(const AVOutputFormat *fmt, const char *short_name,
118 const char *filename, const char *mime_type,
119 enum AVMediaType type)
120 {
121
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 28178 if (av_match_name("segment", fmt->name) || av_match_name("ssegment", fmt->name)) {
122 ✗ const AVOutputFormat *fmt2 = av_guess_format(NULL, filename, NULL);
123 ✗ if (fmt2)
124 ✗ fmt = fmt2;
125 }
126
127
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 28178 if (type == AVMEDIA_TYPE_VIDEO) {
128 10606 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
129
130 #if CONFIG_IMAGE2_MUXER || CONFIG_IMAGE2PIPE_MUXER
131
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 10606 if (!strcmp(fmt->name, "image2") || !strcmp(fmt->name, "image2pipe")) {
132 126 codec_id = ff_guess_image2_codec(filename);
133 }
134 #endif
135
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 10606 if (codec_id == AV_CODEC_ID_NONE)
136 10487 codec_id = fmt->video_codec;
137 10606 return codec_id;
138
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 17572 } else if (type == AVMEDIA_TYPE_AUDIO)
139 9038 return fmt->audio_codec;
140
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 8534 else if (type == AVMEDIA_TYPE_SUBTITLE)
141 32 return fmt->subtitle_codec;
142 else
143 8502 return AV_CODEC_ID_NONE;
144 }
145
146 3954 const AVInputFormat *av_find_input_format(const char *short_name)
147 {
148 3954 const AVInputFormat *fmt = NULL;
149 3954 void *i = 0;
150
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 605769 while ((fmt = av_demuxer_iterate(&i)))
151
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 605769 if (av_match_name(short_name, fmt->name))
152 3954 return fmt;
153 ✗ return NULL;
154 }
155
156 12143 const AVInputFormat *av_probe_input_format3(const AVProbeData *pd,
157 int is_opened, int *score_ret)
158 {
159 12143 AVProbeData lpd = *pd;
160 12143 const AVInputFormat *fmt1 = NULL;
161 12143 const AVInputFormat *fmt = NULL;
162 12143 int score, score_max = 0;
163 12143 void *i = 0;
164 const static uint8_t zerobuffer[AVPROBE_PADDING_SIZE];
165 enum nodat {
166 NO_ID3,
167 ID3_ALMOST_GREATER_PROBE,
168 ID3_GREATER_PROBE,
169 ID3_GREATER_MAX_PROBE,
170 12143 } nodat = NO_ID3;
171
172
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 12143 if (!lpd.buf)
173 4188 lpd.buf = (unsigned char *) zerobuffer;
174
175
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 12226 while (lpd.buf_size > 10 && ff_id3v2_match(lpd.buf, ID3v2_DEFAULT_MAGIC)) {
176 126 int id3len = ff_id3v2_tag_len(lpd.buf);
177
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 126 if (lpd.buf_size > id3len + 16) {
178
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 83 if (lpd.buf_size < 2LL*id3len + 16)
179 30 nodat = ID3_ALMOST_GREATER_PROBE;
180 83 lpd.buf += id3len;
181 83 lpd.buf_size -= id3len;
182
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 43 } else if (id3len >= PROBE_BUF_MAX) {
183 1 nodat = ID3_GREATER_MAX_PROBE;
184 1 break;
185 } else {
186 42 nodat = ID3_GREATER_PROBE;
187 42 break;
188 }
189 }
190
191
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 4466384 while ((fmt1 = av_demuxer_iterate(&i))) {
192
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 4454241 if (fmt1->flags & AVFMT_EXPERIMENTAL)
193 ✗ continue;
194
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 4454241 if (!is_opened == !(fmt1->flags & AVFMT_NOFILE) && strcmp(fmt1->name, "image2"))
195 1569211 continue;
196 2885030 score = 0;
197
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 2885030 if (ffifmt(fmt1)->read_probe) {
198 2470941 score = ffifmt(fmt1)->read_probe(&lpd);
199
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 2470941 if (score)
200 7758 av_log(NULL, AV_LOG_TRACE, "Probing %s score:%d size:%d\n", fmt1->name, score, lpd.buf_size);
201
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 2470941 if (fmt1->extensions && av_match_ext(lpd.filename, fmt1->extensions)) {
202
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 2795 switch (nodat) {
203 2733 case NO_ID3:
204 2733 score = FFMAX(score, 1);
205 2733 break;
206 61 case ID3_GREATER_PROBE:
207 case ID3_ALMOST_GREATER_PROBE:
208 61 score = FFMAX(score, AVPROBE_SCORE_EXTENSION / 2 - 1);
209 61 break;
210 1 case ID3_GREATER_MAX_PROBE:
211 1 score = FFMAX(score, AVPROBE_SCORE_EXTENSION);
212 1 break;
213 }
214 }
215
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 414089 } else if (fmt1->extensions) {
216
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 214785 if (av_match_ext(lpd.filename, fmt1->extensions))
217 33 score = AVPROBE_SCORE_EXTENSION;
218 }
219
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 2885030 if (av_match_name(lpd.mime_type, fmt1->mime_type)) {
220 ✗ int old_score = score;
221 ✗ score += AVPROBE_SCORE_MIME_BONUS;
222 ✗ if (score > AVPROBE_SCORE_MAX) score = AVPROBE_SCORE_MAX;
223 ✗ av_log(NULL, AV_LOG_DEBUG, "Probing %s score:%d increased to %d due to MIME type\n", fmt1->name, old_score, score);
224 }
225
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 2885030 if (score > score_max) {
226 7176 score_max = score;
227 7176 fmt = fmt1;
228
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 2877854 } else if (score == score_max)
229 1496587 fmt = NULL;
230 }
231
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 12143 if (nodat == ID3_GREATER_PROBE)
232 42 score_max = FFMIN(AVPROBE_SCORE_EXTENSION / 2 - 1, score_max);
233 12143 *score_ret = score_max;
234
235 12143 return fmt;
236 }
237
238 8773 const AVInputFormat *av_probe_input_format2(const AVProbeData *pd,
239 int is_opened, int *score_max)
240 {
241 int score_ret;
242 8773 const AVInputFormat *fmt = av_probe_input_format3(pd, is_opened, &score_ret);
243
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 8773 if (score_ret > *score_max) {
244 4205 *score_max = score_ret;
245 4205 return fmt;
246 } else
247 4568 return NULL;
248 }
249
250 ✗ const AVInputFormat *av_probe_input_format(const AVProbeData *pd, int is_opened)
251 {
252 ✗ int score = 0;
253 ✗ return av_probe_input_format2(pd, is_opened, &score);
254 }
255
256 4006 int av_probe_input_buffer2(AVIOContext *pb, const AVInputFormat **fmt,
257 const char *filename, void *logctx,
258 unsigned int offset, unsigned int max_probe_size)
259 {
260
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 4006 AVProbeData pd = { filename ? filename : "" };
261 4006 uint8_t *buf = NULL;
262 4006 int ret = 0, probe_size, buf_offset = 0;
263 4006 int score = 0;
264 int ret2;
265 4006 int eof = 0;
266
267
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 4006 if (!max_probe_size)
268 17 max_probe_size = PROBE_BUF_MAX;
269
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 3989 else if (max_probe_size < PROBE_BUF_MIN) {
270 ✗ av_log(logctx, AV_LOG_ERROR,
271 "Specified probe size value %u cannot be < %u\n", max_probe_size, PROBE_BUF_MIN);
272 ✗ return AVERROR(EINVAL);
273 }
274
275
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 4006 if (offset >= max_probe_size)
276 ✗ return AVERROR(EINVAL);
277
278
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 4006 if (pb->av_class) {
279 3989 uint8_t *mime_type_opt = NULL;
280 char *semi;
281 3989 av_opt_get(pb, "mime_type", AV_OPT_SEARCH_CHILDREN, &mime_type_opt);
282 3989 pd.mime_type = (const char *)mime_type_opt;
283
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 3989 semi = pd.mime_type ? strchr(mime_type_opt, ';') : NULL;
284
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 3989 if (semi) {
285 ✗ *semi = '\0';
286 }
287 }
288
289
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 8591 for (probe_size = PROBE_BUF_MIN; probe_size <= max_probe_size && !*fmt && !eof;
290 4585 probe_size = FFMIN(probe_size << 1,
291 FFMAX(max_probe_size, probe_size + 1))) {
292
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 4585 score = probe_size < max_probe_size ? AVPROBE_SCORE_RETRY : 0;
293
294 /* Read probe data. */
295
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 4585 if ((ret = av_reallocp(&buf, probe_size + AVPROBE_PADDING_SIZE)) < 0)
296 ✗ goto fail;
297
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 4585 if ((ret = avio_read(pb, buf + buf_offset,
298 probe_size - buf_offset)) < 0) {
299 /* Fail if error was not end of file, otherwise, lower score. */
300
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 11 if (ret != AVERROR_EOF)
301 ✗ goto fail;
302
303 11 score = 0;
304 11 ret = 0; /* error was end of file, nothing read */
305 11 eof = 1;
306 }
307 4585 buf_offset += ret;
308
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 4585 if (buf_offset < offset)
309 ✗ continue;
310 4585 pd.buf_size = buf_offset - offset;
311 4585 pd.buf = &buf[offset];
312
313 4585 memset(pd.buf + pd.buf_size, 0, AVPROBE_PADDING_SIZE);
314
315 /* Guess file format. */
316 4585 *fmt = av_probe_input_format2(&pd, 1, &score);
317
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 4585 if (*fmt) {
318 /* This can only be true in the last iteration. */
319
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 4006 if (score <= AVPROBE_SCORE_RETRY) {
320 13 av_log(logctx, AV_LOG_WARNING,
321 "Format %s detected only with low score of %d, "
322 13 "misdetection possible!\n", (*fmt)->name, score);
323 } else
324 3993 av_log(logctx, AV_LOG_DEBUG,
325 "Format %s probed with size=%d and score=%d\n",
326 3993 (*fmt)->name, probe_size, score);
327 #if 0
328 FILE *f = fopen("probestat.tmp", "ab");
329 fprintf(f, "probe_size:%d format:%s score:%d filename:%s\n", probe_size, (*fmt)->name, score, filename);
330 fclose(f);
331 #endif
332 }
333 }
334
335
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 4006 if (!*fmt)
336 ✗ ret = AVERROR_INVALIDDATA;
337
338 4006 fail:
339 /* Rewind. Reuse probe buffer to avoid seeking. */
340 4006 ret2 = ffio_rewind_with_probe_data(pb, &buf, buf_offset);
341
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 4006 if (ret >= 0)
342 4006 ret = ret2;
343
344 4006 av_freep(&pd.mime_type);
345
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 4006 return ret < 0 ? ret : score;
346 }
347
348 17 int av_probe_input_buffer(AVIOContext *pb, const AVInputFormat **fmt,
349 const char *filename, void *logctx,
350 unsigned int offset, unsigned int max_probe_size)
351 {
352 17 int ret = av_probe_input_buffer2(pb, fmt, filename, logctx, offset, max_probe_size);
353 17 return ret < 0 ? ret : 0;
354 }
355