FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/format.c
Date: 2025-08-19 23:55:23
Exec Total Coverage
Lines: 155 189 82.0%
Functions: 9 10 90.0%
Branches: 119 162 73.5%
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 1282796 int av_match_ext(const char *filename, const char *extensions)
42 {
43 const char *ext;
44
45
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 1282796 if (!filename)
46 528438 return 0;
47
48 754358 ext = strrchr(filename, '.');
49
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 754358 if (ext)
50 749031 return av_match_name(ext + 1, extensions);
51 5327 return 0;
52 }
53
54 199 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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 199 if (!url)
62 ✗ return 0;
63
64 199 ret = ff_url_decompose(&uc, url, NULL);
65
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 199 if (ret < 0 || !URL_COMPONENT_HAVE(uc, scheme))
66 199 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 8499 const AVOutputFormat *av_guess_format(const char *short_name, const char *filename,
80 const char *mime_type)
81 {
82 8499 const AVOutputFormat *fmt = NULL;
83 8499 const AVOutputFormat *fmt_found = NULL;
84 8499 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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 8684 if (!short_name && filename &&
90
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 241 av_filename_number_test(filename) &&
91 56 ff_guess_image2_codec(filename) != AV_CODEC_ID_NONE) {
92 51 return av_guess_format("image2", NULL, NULL);
93 }
94 #endif
95 /* Find the proper file type. */
96 8448 score_max = 0;
97
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 1588064 while ((fmt = av_muxer_iterate(&i))) {
98
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 1579616 if (fmt->flags & AVFMT_EXPERIMENTAL && !short_name)
99 ✗ continue;
100 1579616 score = 0;
101
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 1579616 if (fmt->name && short_name && av_match_name(short_name, fmt->name))
102 8347 score += 100;
103
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 1579616 if (fmt->mime_type && mime_type && !strcmp(fmt->mime_type, mime_type))
104 ✗ score += 10;
105
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 1598112 if (filename && fmt->extensions &&
106 18496 av_match_ext(filename, fmt->extensions)) {
107 150 score += 5;
108 }
109
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 1579616 if (score > score_max) {
110 8448 score_max = score;
111 8448 fmt_found = fmt;
112 }
113 }
114 8448 return fmt_found;
115 }
116
117 27252 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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 27252 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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 27252 if (type == AVMEDIA_TYPE_VIDEO) {
128 10290 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
129
130 #if CONFIG_IMAGE2_MUXER || CONFIG_IMAGE2PIPE_MUXER
131
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 10290 if (!strcmp(fmt->name, "image2") || !strcmp(fmt->name, "image2pipe")) {
132 122 codec_id = ff_guess_image2_codec(filename);
133 }
134 #endif
135
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 10290 if (codec_id == AV_CODEC_ID_NONE)
136 10172 codec_id = fmt->video_codec;
137 10290 return codec_id;
138
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 16962 } else if (type == AVMEDIA_TYPE_AUDIO)
139 8716 return fmt->audio_codec;
140
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 8246 else if (type == AVMEDIA_TYPE_SUBTITLE)
141 32 return fmt->subtitle_codec;
142 else
143 8214 return AV_CODEC_ID_NONE;
144 }
145
146 3827 const AVInputFormat *av_find_input_format(const char *short_name)
147 {
148 3827 const AVInputFormat *fmt = NULL;
149 3827 void *i = 0;
150
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 575787 while ((fmt = av_demuxer_iterate(&i)))
151
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 575787 if (av_match_name(short_name, fmt->name))
152 3827 return fmt;
153 ✗ return NULL;
154 }
155
156 11155 const AVInputFormat *av_probe_input_format3(const AVProbeData *pd,
157 int is_opened, int *score_ret)
158 {
159 11155 AVProbeData lpd = *pd;
160 11155 const AVInputFormat *fmt1 = NULL;
161 11155 const AVInputFormat *fmt = NULL;
162 11155 int score, score_max = 0;
163 11155 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 11155 } nodat = NO_ID3;
171
172
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 11155 if (!lpd.buf)
173 3895 lpd.buf = (unsigned char *) zerobuffer;
174
175
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 11155 if (lpd.buf_size > 10 && ff_id3v2_match(lpd.buf, ID3v2_DEFAULT_MAGIC)) {
176 51 int id3len = ff_id3v2_tag_len(lpd.buf);
177
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 51 if (lpd.buf_size > id3len + 16) {
178
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 30 if (lpd.buf_size < 2LL*id3len + 16)
179 13 nodat = ID3_ALMOST_GREATER_PROBE;
180 30 lpd.buf += id3len;
181 30 lpd.buf_size -= id3len;
182
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 21 } else if (id3len >= PROBE_BUF_MAX) {
183 ✗ nodat = ID3_GREATER_MAX_PROBE;
184 } else
185 21 nodat = ID3_GREATER_PROBE;
186 }
187
188
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 4058306 while ((fmt1 = av_demuxer_iterate(&i))) {
189
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 4047151 if (fmt1->flags & AVFMT_EXPERIMENTAL)
190 ✗ continue;
191
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 4047151 if (!is_opened == !(fmt1->flags & AVFMT_NOFILE) && strcmp(fmt1->name, "image2"))
192 1442457 continue;
193 2604694 score = 0;
194
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 2604694 if (ffifmt(fmt1)->read_probe) {
195 2226382 score = ffifmt(fmt1)->read_probe(&lpd);
196
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 2226382 if (score)
197 7073 av_log(NULL, AV_LOG_TRACE, "Probing %s score:%d size:%d\n", fmt1->name, score, lpd.buf_size);
198
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 2226382 if (fmt1->extensions && av_match_ext(lpd.filename, fmt1->extensions)) {
199
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 2416 switch (nodat) {
200 2386 case NO_ID3:
201 2386 score = FFMAX(score, 1);
202 2386 break;
203 30 case ID3_GREATER_PROBE:
204 case ID3_ALMOST_GREATER_PROBE:
205 30 score = FFMAX(score, AVPROBE_SCORE_EXTENSION / 2 - 1);
206 30 break;
207 ✗ case ID3_GREATER_MAX_PROBE:
208 ✗ score = FFMAX(score, AVPROBE_SCORE_EXTENSION);
209 ✗ break;
210 }
211 }
212
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 378312 } else if (fmt1->extensions) {
213
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 196020 if (av_match_ext(lpd.filename, fmt1->extensions))
214 26 score = AVPROBE_SCORE_EXTENSION;
215 }
216
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 2604694 if (av_match_name(lpd.mime_type, fmt1->mime_type)) {
217 ✗ int old_score = score;
218 ✗ score += AVPROBE_SCORE_MIME_BONUS;
219 ✗ if (score > AVPROBE_SCORE_MAX) score = AVPROBE_SCORE_MAX;
220 ✗ av_log(NULL, AV_LOG_DEBUG, "Probing %s score:%d increased to %d due to MIME type\n", fmt1->name, old_score, score);
221 }
222
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 2604694 if (score > score_max) {
223 6512 score_max = score;
224 6512 fmt = fmt1;
225
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 2598182 } else if (score == score_max)
226 1378164 fmt = NULL;
227 }
228
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 11155 if (nodat == ID3_GREATER_PROBE)
229 21 score_max = FFMIN(AVPROBE_SCORE_EXTENSION / 2 - 1, score_max);
230 11155 *score_ret = score_max;
231
232 11155 return fmt;
233 }
234
235 8118 const AVInputFormat *av_probe_input_format2(const AVProbeData *pd,
236 int is_opened, int *score_max)
237 {
238 int score_ret;
239 8118 const AVInputFormat *fmt = av_probe_input_format3(pd, is_opened, &score_ret);
240
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 8118 if (score_ret > *score_max) {
241 3908 *score_max = score_ret;
242 3908 return fmt;
243 } else
244 4210 return NULL;
245 }
246
247 ✗ const AVInputFormat *av_probe_input_format(const AVProbeData *pd, int is_opened)
248 {
249 ✗ int score = 0;
250 ✗ return av_probe_input_format2(pd, is_opened, &score);
251 }
252
253 3715 int av_probe_input_buffer2(AVIOContext *pb, const AVInputFormat **fmt,
254 const char *filename, void *logctx,
255 unsigned int offset, unsigned int max_probe_size)
256 {
257
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 3715 AVProbeData pd = { filename ? filename : "" };
258 3715 uint8_t *buf = NULL;
259 3715 int ret = 0, probe_size, buf_offset = 0;
260 3715 int score = 0;
261 int ret2;
262 3715 int eof = 0;
263
264
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 3715 if (!max_probe_size)
265 13 max_probe_size = PROBE_BUF_MAX;
266
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 3702 else if (max_probe_size < PROBE_BUF_MIN) {
267 ✗ av_log(logctx, AV_LOG_ERROR,
268 "Specified probe size value %u cannot be < %u\n", max_probe_size, PROBE_BUF_MIN);
269 ✗ return AVERROR(EINVAL);
270 }
271
272
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 3715 if (offset >= max_probe_size)
273 ✗ return AVERROR(EINVAL);
274
275
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 3715 if (pb->av_class) {
276 3702 uint8_t *mime_type_opt = NULL;
277 char *semi;
278 3702 av_opt_get(pb, "mime_type", AV_OPT_SEARCH_CHILDREN, &mime_type_opt);
279 3702 pd.mime_type = (const char *)mime_type_opt;
280
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 3702 semi = pd.mime_type ? strchr(pd.mime_type, ';') : NULL;
281
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 3702 if (semi) {
282 ✗ *semi = '\0';
283 }
284 }
285
286
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 7938 for (probe_size = PROBE_BUF_MIN; probe_size <= max_probe_size && !*fmt && !eof;
287 4223 probe_size = FFMIN(probe_size << 1,
288 FFMAX(max_probe_size, probe_size + 1))) {
289
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 4223 score = probe_size < max_probe_size ? AVPROBE_SCORE_RETRY : 0;
290
291 /* Read probe data. */
292
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 4223 if ((ret = av_reallocp(&buf, probe_size + AVPROBE_PADDING_SIZE)) < 0)
293 ✗ goto fail;
294
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 4223 if ((ret = avio_read(pb, buf + buf_offset,
295 probe_size - buf_offset)) < 0) {
296 /* Fail if error was not end of file, otherwise, lower score. */
297
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 8 if (ret != AVERROR_EOF)
298 ✗ goto fail;
299
300 8 score = 0;
301 8 ret = 0; /* error was end of file, nothing read */
302 8 eof = 1;
303 }
304 4223 buf_offset += ret;
305
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 4223 if (buf_offset < offset)
306 ✗ continue;
307 4223 pd.buf_size = buf_offset - offset;
308 4223 pd.buf = &buf[offset];
309
310 4223 memset(pd.buf + pd.buf_size, 0, AVPROBE_PADDING_SIZE);
311
312 /* Guess file format. */
313 4223 *fmt = av_probe_input_format2(&pd, 1, &score);
314
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 4223 if (*fmt) {
315 /* This can only be true in the last iteration. */
316
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 3715 if (score <= AVPROBE_SCORE_RETRY) {
317 10 av_log(logctx, AV_LOG_WARNING,
318 "Format %s detected only with low score of %d, "
319 10 "misdetection possible!\n", (*fmt)->name, score);
320 } else
321 3705 av_log(logctx, AV_LOG_DEBUG,
322 "Format %s probed with size=%d and score=%d\n",
323 3705 (*fmt)->name, probe_size, score);
324 #if 0
325 FILE *f = fopen("probestat.tmp", "ab");
326 fprintf(f, "probe_size:%d format:%s score:%d filename:%s\n", probe_size, (*fmt)->name, score, filename);
327 fclose(f);
328 #endif
329 }
330 }
331
332
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 3715 if (!*fmt)
333 ✗ ret = AVERROR_INVALIDDATA;
334
335 3715 fail:
336 /* Rewind. Reuse probe buffer to avoid seeking. */
337 3715 ret2 = ffio_rewind_with_probe_data(pb, &buf, buf_offset);
338
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 3715 if (ret >= 0)
339 3715 ret = ret2;
340
341 3715 av_freep(&pd.mime_type);
342
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 3715 return ret < 0 ? ret : score;
343 }
344
345 13 int av_probe_input_buffer(AVIOContext *pb, const AVInputFormat **fmt,
346 const char *filename, void *logctx,
347 unsigned int offset, unsigned int max_probe_size)
348 {
349 13 int ret = av_probe_input_buffer2(pb, fmt, filename, logctx, offset, max_probe_size);
350 13 return ret < 0 ? ret : 0;
351 }
352