2 * Format register and lookup
3 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/avstring.h"
23 #include "libavutil/bprint.h"
24 #include "libavutil/opt.h"
25 #include "libavutil/thread.h"
27 #include "avio_internal.h"
35 * Format register and lookup
38 int av_match_ext(const char *filename, const char *extensions)
45 ext = strrchr(filename, '.');
47 return av_match_name(ext + 1, extensions);
51 AVOutputFormat *av_guess_format(const char *short_name, const char *filename,
52 const char *mime_type)
54 AVOutputFormat *fmt = NULL, *fmt_found;
60 /* specific test for image sequences */
61 #if CONFIG_IMAGE2_MUXER
62 if (!short_name && filename &&
63 av_filename_number_test(filename) &&
64 ff_guess_image2_codec(filename) != AV_CODEC_ID_NONE) {
65 return av_guess_format("image2", NULL, NULL);
68 /* Find the proper file type. */
72 FF_DISABLE_DEPRECATION_WARNINGS
73 while ((fmt = av_oformat_next(fmt)))
75 while ((fmt = av_muxer_iterate(&i)))
79 if (fmt->name && short_name && av_match_name(short_name, fmt->name))
81 if (fmt->mime_type && mime_type && !strcmp(fmt->mime_type, mime_type))
83 if (filename && fmt->extensions &&
84 av_match_ext(filename, fmt->extensions)) {
87 if (score > score_max) {
93 FF_ENABLE_DEPRECATION_WARNINGS
98 enum AVCodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
99 const char *filename, const char *mime_type,
100 enum AVMediaType type)
102 if (av_match_name("segment", fmt->name) || av_match_name("ssegment", fmt->name)) {
103 AVOutputFormat *fmt2 = av_guess_format(NULL, filename, NULL);
108 if (type == AVMEDIA_TYPE_VIDEO) {
109 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
111 #if CONFIG_IMAGE2_MUXER
112 if (!strcmp(fmt->name, "image2") || !strcmp(fmt->name, "image2pipe")) {
113 codec_id = ff_guess_image2_codec(filename);
116 if (codec_id == AV_CODEC_ID_NONE)
117 codec_id = fmt->video_codec;
119 } else if (type == AVMEDIA_TYPE_AUDIO)
120 return fmt->audio_codec;
121 else if (type == AVMEDIA_TYPE_SUBTITLE)
122 return fmt->subtitle_codec;
123 else if (type == AVMEDIA_TYPE_DATA)
124 return fmt->data_codec;
126 return AV_CODEC_ID_NONE;
129 AVInputFormat *av_find_input_format(const char *short_name)
131 AVInputFormat *fmt = NULL;
133 FF_DISABLE_DEPRECATION_WARNINGS
134 while ((fmt = av_iformat_next(fmt)))
135 if (av_match_name(short_name, fmt->name))
137 FF_ENABLE_DEPRECATION_WARNINGS
140 while ((fmt = av_demuxer_iterate(&i)))
141 if (av_match_name(short_name, fmt->name))
147 AVInputFormat *av_probe_input_format3(AVProbeData *pd, int is_opened,
150 AVProbeData lpd = *pd;
151 AVInputFormat *fmt1 = NULL, *fmt;
152 int score, score_max = 0;
154 const static uint8_t zerobuffer[AVPROBE_PADDING_SIZE];
157 ID3_ALMOST_GREATER_PROBE,
159 ID3_GREATER_MAX_PROBE,
163 lpd.buf = (unsigned char *) zerobuffer;
165 if (lpd.buf_size > 10 && ff_id3v2_match(lpd.buf, ID3v2_DEFAULT_MAGIC)) {
166 int id3len = ff_id3v2_tag_len(lpd.buf);
167 if (lpd.buf_size > id3len + 16) {
168 if (lpd.buf_size < 2LL*id3len + 16)
169 nodat = ID3_ALMOST_GREATER_PROBE;
171 lpd.buf_size -= id3len;
172 } else if (id3len >= PROBE_BUF_MAX) {
173 nodat = ID3_GREATER_MAX_PROBE;
175 nodat = ID3_GREATER_PROBE;
179 while ((fmt1 = av_demuxer_iterate(&i))) {
180 if (!is_opened == !(fmt1->flags & AVFMT_NOFILE) && strcmp(fmt1->name, "image2"))
183 if (fmt1->read_probe) {
184 score = fmt1->read_probe(&lpd);
186 av_log(NULL, AV_LOG_TRACE, "Probing %s score:%d size:%d\n", fmt1->name, score, lpd.buf_size);
187 if (fmt1->extensions && av_match_ext(lpd.filename, fmt1->extensions)) {
190 score = FFMAX(score, 1);
192 case ID3_GREATER_PROBE:
193 case ID3_ALMOST_GREATER_PROBE:
194 score = FFMAX(score, AVPROBE_SCORE_EXTENSION / 2 - 1);
196 case ID3_GREATER_MAX_PROBE:
197 score = FFMAX(score, AVPROBE_SCORE_EXTENSION);
201 } else if (fmt1->extensions) {
202 if (av_match_ext(lpd.filename, fmt1->extensions))
203 score = AVPROBE_SCORE_EXTENSION;
205 if (av_match_name(lpd.mime_type, fmt1->mime_type)) {
206 if (AVPROBE_SCORE_MIME > score) {
207 av_log(NULL, AV_LOG_DEBUG, "Probing %s score:%d increased to %d due to MIME type\n", fmt1->name, score, AVPROBE_SCORE_MIME);
208 score = AVPROBE_SCORE_MIME;
211 if (score > score_max) {
214 } else if (score == score_max)
217 if (nodat == ID3_GREATER_PROBE)
218 score_max = FFMIN(AVPROBE_SCORE_EXTENSION / 2 - 1, score_max);
219 *score_ret = score_max;
224 AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max)
227 AVInputFormat *fmt = av_probe_input_format3(pd, is_opened, &score_ret);
228 if (score_ret > *score_max) {
229 *score_max = score_ret;
235 AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened)
238 return av_probe_input_format2(pd, is_opened, &score);
241 int av_probe_input_buffer2(AVIOContext *pb, AVInputFormat **fmt,
242 const char *filename, void *logctx,
243 unsigned int offset, unsigned int max_probe_size)
245 AVProbeData pd = { filename ? filename : "" };
247 int ret = 0, probe_size, buf_offset = 0;
252 max_probe_size = PROBE_BUF_MAX;
253 else if (max_probe_size < PROBE_BUF_MIN) {
254 av_log(logctx, AV_LOG_ERROR,
255 "Specified probe size value %u cannot be < %u\n", max_probe_size, PROBE_BUF_MIN);
256 return AVERROR(EINVAL);
259 if (offset >= max_probe_size)
260 return AVERROR(EINVAL);
263 uint8_t *mime_type_opt = NULL;
265 av_opt_get(pb, "mime_type", AV_OPT_SEARCH_CHILDREN, &mime_type_opt);
266 pd.mime_type = (const char *)mime_type_opt;
267 semi = pd.mime_type ? strchr(pd.mime_type, ';') : NULL;
273 if (!*fmt && pb->av_class && av_opt_get(pb, "mime_type", AV_OPT_SEARCH_CHILDREN, &mime_type) >= 0 && mime_type) {
274 if (!av_strcasecmp(mime_type, "audio/aacp")) {
275 *fmt = av_find_input_format("aac");
277 av_freep(&mime_type);
281 for (probe_size = PROBE_BUF_MIN; probe_size <= max_probe_size && !*fmt;
282 probe_size = FFMIN(probe_size << 1,
283 FFMAX(max_probe_size, probe_size + 1))) {
284 score = probe_size < max_probe_size ? AVPROBE_SCORE_RETRY : 0;
286 /* Read probe data. */
287 if ((ret = av_reallocp(&buf, probe_size + AVPROBE_PADDING_SIZE)) < 0)
289 if ((ret = avio_read(pb, buf + buf_offset,
290 probe_size - buf_offset)) < 0) {
291 /* Fail if error was not end of file, otherwise, lower score. */
292 if (ret != AVERROR_EOF)
296 ret = 0; /* error was end of file, nothing read */
299 if (buf_offset < offset)
301 pd.buf_size = buf_offset - offset;
302 pd.buf = &buf[offset];
304 memset(pd.buf + pd.buf_size, 0, AVPROBE_PADDING_SIZE);
306 /* Guess file format. */
307 *fmt = av_probe_input_format2(&pd, 1, &score);
309 /* This can only be true in the last iteration. */
310 if (score <= AVPROBE_SCORE_RETRY) {
311 av_log(logctx, AV_LOG_WARNING,
312 "Format %s detected only with low score of %d, "
313 "misdetection possible!\n", (*fmt)->name, score);
315 av_log(logctx, AV_LOG_DEBUG,
316 "Format %s probed with size=%d and score=%d\n",
317 (*fmt)->name, probe_size, score);
319 FILE *f = fopen("probestat.tmp", "ab");
320 fprintf(f, "probe_size:%d format:%s score:%d filename:%s\n", probe_size, (*fmt)->name, score, filename);
327 ret = AVERROR_INVALIDDATA;
330 /* Rewind. Reuse probe buffer to avoid seeking. */
331 ret2 = ffio_rewind_with_probe_data(pb, &buf, buf_offset);
335 av_freep(&pd.mime_type);
336 return ret < 0 ? ret : score;
339 int av_probe_input_buffer(AVIOContext *pb, AVInputFormat **fmt,
340 const char *filename, void *logctx,
341 unsigned int offset, unsigned int max_probe_size)
343 int ret = av_probe_input_buffer2(pb, fmt, filename, logctx, offset, max_probe_size);
344 return ret < 0 ? ret : 0;