FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/format.c
Date: 2025-03-08 20:38:41
Exec Total Coverage
Lines: 154 187 82.4%
Functions: 9 10 90.0%
Branches: 118 158 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 1258094 int av_match_ext(const char *filename, const char *extensions)
42 {
43 const char *ext;
44
45
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 1258094 if (!filename)
46 520300 return 0;
47
48 737794 ext = strrchr(filename, '.');
49
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 737794 if (ext)
50 732873 return av_match_name(ext + 1, extensions);
51 4921 return 0;
52 }
53
54 195 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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 195 if (!url)
62 ✗ return 0;
63
64 195 ret = ff_url_decompose(&uc, url, NULL);
65
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 195 if (ret < 0 || !URL_COMPONENT_HAVE(uc, scheme))
66 195 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 8030 const AVOutputFormat *av_guess_format(const char *short_name, const char *filename,
80 const char *mime_type)
81 {
82 8030 const AVOutputFormat *fmt = NULL;
83 8030 const AVOutputFormat *fmt_found = NULL;
84 8030 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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 8213 if (!short_name && filename &&
90
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 239 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 7979 score_max = 0;
97
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 1491881 while ((fmt = av_muxer_iterate(&i))) {
98 1483902 score = 0;
99
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 1483902 if (fmt->name && short_name && av_match_name(short_name, fmt->name))
100 7879 score += 100;
101
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 1483902 if (fmt->mime_type && mime_type && !strcmp(fmt->mime_type, mime_type))
102 ✗ score += 10;
103
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 1501858 if (filename && fmt->extensions &&
104 17956 av_match_ext(filename, fmt->extensions)) {
105 147 score += 5;
106 }
107
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 1483902 if (score > score_max) {
108 7979 score_max = score;
109 7979 fmt_found = fmt;
110 }
111 }
112 7979 return fmt_found;
113 }
114
115 25866 enum AVCodecID av_guess_codec(const AVOutputFormat *fmt, const char *short_name,
116 const char *filename, const char *mime_type,
117 enum AVMediaType type)
118 {
119
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 25866 if (av_match_name("segment", fmt->name) || av_match_name("ssegment", fmt->name)) {
120 ✗ const AVOutputFormat *fmt2 = av_guess_format(NULL, filename, NULL);
121 ✗ if (fmt2)
122 ✗ fmt = fmt2;
123 }
124
125
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 25866 if (type == AVMEDIA_TYPE_VIDEO) {
126 9814 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
127
128 #if CONFIG_IMAGE2_MUXER || CONFIG_IMAGE2PIPE_MUXER
129
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 9814 if (!strcmp(fmt->name, "image2") || !strcmp(fmt->name, "image2pipe")) {
130 122 codec_id = ff_guess_image2_codec(filename);
131 }
132 #endif
133
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 9814 if (codec_id == AV_CODEC_ID_NONE)
134 9696 codec_id = fmt->video_codec;
135 9814 return codec_id;
136
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 16052 } else if (type == AVMEDIA_TYPE_AUDIO)
137 8262 return fmt->audio_codec;
138
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 7790 else if (type == AVMEDIA_TYPE_SUBTITLE)
139 30 return fmt->subtitle_codec;
140 else
141 7760 return AV_CODEC_ID_NONE;
142 }
143
144 3692 const AVInputFormat *av_find_input_format(const char *short_name)
145 {
146 3692 const AVInputFormat *fmt = NULL;
147 3692 void *i = 0;
148
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 549369 while ((fmt = av_demuxer_iterate(&i)))
149
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 549369 if (av_match_name(short_name, fmt->name))
150 3692 return fmt;
151 ✗ return NULL;
152 }
153
154 11056 const AVInputFormat *av_probe_input_format3(const AVProbeData *pd,
155 int is_opened, int *score_ret)
156 {
157 11056 AVProbeData lpd = *pd;
158 11056 const AVInputFormat *fmt1 = NULL;
159 11056 const AVInputFormat *fmt = NULL;
160 11056 int score, score_max = 0;
161 11056 void *i = 0;
162 const static uint8_t zerobuffer[AVPROBE_PADDING_SIZE];
163 enum nodat {
164 NO_ID3,
165 ID3_ALMOST_GREATER_PROBE,
166 ID3_GREATER_PROBE,
167 ID3_GREATER_MAX_PROBE,
168 11056 } nodat = NO_ID3;
169
170
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 11056 if (!lpd.buf)
171 3852 lpd.buf = (unsigned char *) zerobuffer;
172
173
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 11056 if (lpd.buf_size > 10 && ff_id3v2_match(lpd.buf, ID3v2_DEFAULT_MAGIC)) {
174 51 int id3len = ff_id3v2_tag_len(lpd.buf);
175
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 51 if (lpd.buf_size > id3len + 16) {
176
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 30 if (lpd.buf_size < 2LL*id3len + 16)
177 13 nodat = ID3_ALMOST_GREATER_PROBE;
178 30 lpd.buf += id3len;
179 30 lpd.buf_size -= id3len;
180
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 21 } else if (id3len >= PROBE_BUF_MAX) {
181 ✗ nodat = ID3_GREATER_MAX_PROBE;
182 } else
183 21 nodat = ID3_GREATER_PROBE;
184 }
185
186
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 4000200 while ((fmt1 = av_demuxer_iterate(&i))) {
187
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 3989144 if (fmt1->flags & AVFMT_EXPERIMENTAL)
188 ✗ continue;
189
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 3989144 if (!is_opened == !(fmt1->flags & AVFMT_NOFILE) && strcmp(fmt1->name, "image2"))
190 1419078 continue;
191 2570066 score = 0;
192
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 2570066 if (ffifmt(fmt1)->read_probe) {
193 2201942 score = ffifmt(fmt1)->read_probe(&lpd);
194
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 2201942 if (score)
195 6989 av_log(NULL, AV_LOG_TRACE, "Probing %s score:%d size:%d\n", fmt1->name, score, lpd.buf_size);
196
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 2201942 if (fmt1->extensions && av_match_ext(lpd.filename, fmt1->extensions)) {
197
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 2386 switch (nodat) {
198 2356 case NO_ID3:
199 2356 score = FFMAX(score, 1);
200 2356 break;
201 30 case ID3_GREATER_PROBE:
202 case ID3_ALMOST_GREATER_PROBE:
203 30 score = FFMAX(score, AVPROBE_SCORE_EXTENSION / 2 - 1);
204 30 break;
205 ✗ case ID3_GREATER_MAX_PROBE:
206 ✗ score = FFMAX(score, AVPROBE_SCORE_EXTENSION);
207 ✗ break;
208 }
209 }
210
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 368124 } else if (fmt1->extensions) {
211
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 187304 if (av_match_ext(lpd.filename, fmt1->extensions))
212 25 score = AVPROBE_SCORE_EXTENSION;
213 }
214
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 2570066 if (av_match_name(lpd.mime_type, fmt1->mime_type)) {
215 ✗ int old_score = score;
216 ✗ score += AVPROBE_SCORE_MIME_BONUS;
217 ✗ if (score > AVPROBE_SCORE_MAX) score = AVPROBE_SCORE_MAX;
218 ✗ av_log(NULL, AV_LOG_DEBUG, "Probing %s score:%d increased to %d due to MIME type\n", fmt1->name, old_score, score);
219 }
220
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 2570066 if (score > score_max) {
221 6443 score_max = score;
222 6443 fmt = fmt1;
223
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 2563623 } else if (score == score_max)
224 1360900 fmt = NULL;
225 }
226
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 11056 if (nodat == ID3_GREATER_PROBE)
227 21 score_max = FFMIN(AVPROBE_SCORE_EXTENSION / 2 - 1, score_max);
228 11056 *score_ret = score_max;
229
230 11056 return fmt;
231 }
232
233 8031 const AVInputFormat *av_probe_input_format2(const AVProbeData *pd,
234 int is_opened, int *score_max)
235 {
236 int score_ret;
237 8031 const AVInputFormat *fmt = av_probe_input_format3(pd, is_opened, &score_ret);
238
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 8031 if (score_ret > *score_max) {
239 3864 *score_max = score_ret;
240 3864 return fmt;
241 } else
242 4167 return NULL;
243 }
244
245 ✗ const AVInputFormat *av_probe_input_format(const AVProbeData *pd, int is_opened)
246 {
247 ✗ int score = 0;
248 ✗ return av_probe_input_format2(pd, is_opened, &score);
249 }
250
251 3671 int av_probe_input_buffer2(AVIOContext *pb, const AVInputFormat **fmt,
252 const char *filename, void *logctx,
253 unsigned int offset, unsigned int max_probe_size)
254 {
255
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 3671 AVProbeData pd = { filename ? filename : "" };
256 3671 uint8_t *buf = NULL;
257 3671 int ret = 0, probe_size, buf_offset = 0;
258 3671 int score = 0;
259 int ret2;
260 3671 int eof = 0;
261
262
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 3671 if (!max_probe_size)
263 12 max_probe_size = PROBE_BUF_MAX;
264
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 3659 else if (max_probe_size < PROBE_BUF_MIN) {
265 ✗ av_log(logctx, AV_LOG_ERROR,
266 "Specified probe size value %u cannot be < %u\n", max_probe_size, PROBE_BUF_MIN);
267 ✗ return AVERROR(EINVAL);
268 }
269
270
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 3671 if (offset >= max_probe_size)
271 ✗ return AVERROR(EINVAL);
272
273
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 3671 if (pb->av_class) {
274 3659 uint8_t *mime_type_opt = NULL;
275 char *semi;
276 3659 av_opt_get(pb, "mime_type", AV_OPT_SEARCH_CHILDREN, &mime_type_opt);
277 3659 pd.mime_type = (const char *)mime_type_opt;
278
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 3659 semi = pd.mime_type ? strchr(pd.mime_type, ';') : NULL;
279
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 3659 if (semi) {
280 ✗ *semi = '\0';
281 }
282 }
283
284
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 7850 for (probe_size = PROBE_BUF_MIN; probe_size <= max_probe_size && !*fmt && !eof;
285 4179 probe_size = FFMIN(probe_size << 1,
286 FFMAX(max_probe_size, probe_size + 1))) {
287
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 4179 score = probe_size < max_probe_size ? AVPROBE_SCORE_RETRY : 0;
288
289 /* Read probe data. */
290
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 4179 if ((ret = av_reallocp(&buf, probe_size + AVPROBE_PADDING_SIZE)) < 0)
291 ✗ goto fail;
292
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 4179 if ((ret = avio_read(pb, buf + buf_offset,
293 probe_size - buf_offset)) < 0) {
294 /* Fail if error was not end of file, otherwise, lower score. */
295
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 8 if (ret != AVERROR_EOF)
296 ✗ goto fail;
297
298 8 score = 0;
299 8 ret = 0; /* error was end of file, nothing read */
300 8 eof = 1;
301 }
302 4179 buf_offset += ret;
303
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 4179 if (buf_offset < offset)
304 ✗ continue;
305 4179 pd.buf_size = buf_offset - offset;
306 4179 pd.buf = &buf[offset];
307
308 4179 memset(pd.buf + pd.buf_size, 0, AVPROBE_PADDING_SIZE);
309
310 /* Guess file format. */
311 4179 *fmt = av_probe_input_format2(&pd, 1, &score);
312
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 4179 if (*fmt) {
313 /* This can only be true in the last iteration. */
314
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 3671 if (score <= AVPROBE_SCORE_RETRY) {
315 10 av_log(logctx, AV_LOG_WARNING,
316 "Format %s detected only with low score of %d, "
317 10 "misdetection possible!\n", (*fmt)->name, score);
318 } else
319 3661 av_log(logctx, AV_LOG_DEBUG,
320 "Format %s probed with size=%d and score=%d\n",
321 3661 (*fmt)->name, probe_size, score);
322 #if 0
323 FILE *f = fopen("probestat.tmp", "ab");
324 fprintf(f, "probe_size:%d format:%s score:%d filename:%s\n", probe_size, (*fmt)->name, score, filename);
325 fclose(f);
326 #endif
327 }
328 }
329
330
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 3671 if (!*fmt)
331 ✗ ret = AVERROR_INVALIDDATA;
332
333 3671 fail:
334 /* Rewind. Reuse probe buffer to avoid seeking. */
335 3671 ret2 = ffio_rewind_with_probe_data(pb, &buf, buf_offset);
336
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 3671 if (ret >= 0)
337 3671 ret = ret2;
338
339 3671 av_freep(&pd.mime_type);
340
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 3671 return ret < 0 ? ret : score;
341 }
342
343 12 int av_probe_input_buffer(AVIOContext *pb, const AVInputFormat **fmt,
344 const char *filename, void *logctx,
345 unsigned int offset, unsigned int max_probe_size)
346 {
347 12 int ret = av_probe_input_buffer2(pb, fmt, filename, logctx, offset, max_probe_size);
348 12 return ret < 0 ? ret : 0;
349 }
350