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 "config_components.h"
24 #include "libavutil/avstring.h"
25 #include "libavutil/bprint.h"
26 #include "libavutil/opt.h"
27 #include "libavutil/thread.h"
29 #include "avio_internal.h"
38 * Format register and lookup
41 int av_match_ext(const char *filename, const char *extensions)
48 ext = strrchr(filename, '.');
50 return av_match_name(ext + 1, extensions);
54 int ff_match_url_ext(const char *url, const char *extensions)
64 ret = ff_url_decompose(&uc, url, NULL);
65 if (ret < 0 || !URL_COMPONENT_HAVE(uc, scheme))
67 for (ext = uc.query; *ext != '.' && ext > uc.path; ext--)
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);
76 return av_match_name(scratchpad, extensions);
79 const AVOutputFormat *av_guess_format(const char *short_name, const char *filename,
80 const char *mime_type)
82 const AVOutputFormat *fmt = NULL;
83 const AVOutputFormat *fmt_found = NULL;
87 /* specific test for image sequences */
88 #if CONFIG_IMAGE2_MUXER
89 if (!short_name && filename &&
90 av_filename_number_test(filename) &&
91 ff_guess_image2_codec(filename) != AV_CODEC_ID_NONE) {
92 return av_guess_format("image2", NULL, NULL);
95 /* Find the proper file type. */
97 while ((fmt = av_muxer_iterate(&i))) {
99 if (fmt->name && short_name && av_match_name(short_name, fmt->name))
101 if (fmt->mime_type && mime_type && !strcmp(fmt->mime_type, mime_type))
103 if (filename && fmt->extensions &&
104 av_match_ext(filename, fmt->extensions)) {
107 if (score > score_max) {
115 enum AVCodecID av_guess_codec(const AVOutputFormat *fmt, const char *short_name,
116 const char *filename, const char *mime_type,
117 enum AVMediaType type)
119 if (av_match_name("segment", fmt->name) || av_match_name("ssegment", fmt->name)) {
120 const AVOutputFormat *fmt2 = av_guess_format(NULL, filename, NULL);
125 if (type == AVMEDIA_TYPE_VIDEO) {
126 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
128 #if CONFIG_IMAGE2_MUXER || CONFIG_IMAGE2PIPE_MUXER
129 if (!strcmp(fmt->name, "image2") || !strcmp(fmt->name, "image2pipe")) {
130 codec_id = ff_guess_image2_codec(filename);
133 if (codec_id == AV_CODEC_ID_NONE)
134 codec_id = fmt->video_codec;
136 } else if (type == AVMEDIA_TYPE_AUDIO)
137 return fmt->audio_codec;
138 else if (type == AVMEDIA_TYPE_SUBTITLE)
139 return fmt->subtitle_codec;
141 return AV_CODEC_ID_NONE;
144 const AVInputFormat *av_find_input_format(const char *short_name)
146 const AVInputFormat *fmt = NULL;
148 while ((fmt = av_demuxer_iterate(&i)))
149 if (av_match_name(short_name, fmt->name))
154 const AVInputFormat *av_probe_input_format3(const AVProbeData *pd,
155 int is_opened, int *score_ret)
157 AVProbeData lpd = *pd;
158 const AVInputFormat *fmt1 = NULL;
159 const AVInputFormat *fmt = NULL;
160 int score, score_max = 0;
162 const static uint8_t zerobuffer[AVPROBE_PADDING_SIZE];
165 ID3_ALMOST_GREATER_PROBE,
167 ID3_GREATER_MAX_PROBE,
171 lpd.buf = (unsigned char *) zerobuffer;
173 if (lpd.buf_size > 10 && ff_id3v2_match(lpd.buf, ID3v2_DEFAULT_MAGIC)) {
174 int id3len = ff_id3v2_tag_len(lpd.buf);
175 if (lpd.buf_size > id3len + 16) {
176 if (lpd.buf_size < 2LL*id3len + 16)
177 nodat = ID3_ALMOST_GREATER_PROBE;
179 lpd.buf_size -= id3len;
180 } else if (id3len >= PROBE_BUF_MAX) {
181 nodat = ID3_GREATER_MAX_PROBE;
183 nodat = ID3_GREATER_PROBE;
186 while ((fmt1 = av_demuxer_iterate(&i))) {
187 if (fmt1->flags & AVFMT_EXPERIMENTAL)
189 if (!is_opened == !(fmt1->flags & AVFMT_NOFILE) && strcmp(fmt1->name, "image2"))
192 if (fmt1->read_probe) {
193 score = fmt1->read_probe(&lpd);
195 av_log(NULL, AV_LOG_TRACE, "Probing %s score:%d size:%d\n", fmt1->name, score, lpd.buf_size);
196 if (fmt1->extensions && av_match_ext(lpd.filename, fmt1->extensions)) {
199 score = FFMAX(score, 1);
201 case ID3_GREATER_PROBE:
202 case ID3_ALMOST_GREATER_PROBE:
203 score = FFMAX(score, AVPROBE_SCORE_EXTENSION / 2 - 1);
205 case ID3_GREATER_MAX_PROBE:
206 score = FFMAX(score, AVPROBE_SCORE_EXTENSION);
210 } else if (fmt1->extensions) {
211 if (av_match_ext(lpd.filename, fmt1->extensions))
212 score = AVPROBE_SCORE_EXTENSION;
214 if (av_match_name(lpd.mime_type, fmt1->mime_type)) {
215 if (AVPROBE_SCORE_MIME > score) {
216 av_log(NULL, AV_LOG_DEBUG, "Probing %s score:%d increased to %d due to MIME type\n", fmt1->name, score, AVPROBE_SCORE_MIME);
217 score = AVPROBE_SCORE_MIME;
220 if (score > score_max) {
223 } else if (score == score_max)
226 if (nodat == ID3_GREATER_PROBE)
227 score_max = FFMIN(AVPROBE_SCORE_EXTENSION / 2 - 1, score_max);
228 *score_ret = score_max;
233 const AVInputFormat *av_probe_input_format2(const AVProbeData *pd,
234 int is_opened, int *score_max)
237 const AVInputFormat *fmt = av_probe_input_format3(pd, is_opened, &score_ret);
238 if (score_ret > *score_max) {
239 *score_max = score_ret;
245 const AVInputFormat *av_probe_input_format(const AVProbeData *pd, int is_opened)
248 return av_probe_input_format2(pd, is_opened, &score);
251 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)
255 AVProbeData pd = { filename ? filename : "" };
257 int ret = 0, probe_size, buf_offset = 0;
263 max_probe_size = PROBE_BUF_MAX;
264 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);
270 if (offset >= max_probe_size)
271 return AVERROR(EINVAL);
274 uint8_t *mime_type_opt = NULL;
276 av_opt_get(pb, "mime_type", AV_OPT_SEARCH_CHILDREN, &mime_type_opt);
277 pd.mime_type = (const char *)mime_type_opt;
278 semi = pd.mime_type ? strchr(pd.mime_type, ';') : NULL;
284 for (probe_size = PROBE_BUF_MIN; probe_size <= max_probe_size && !*fmt && !eof;
285 probe_size = FFMIN(probe_size << 1,
286 FFMAX(max_probe_size, probe_size + 1))) {
287 score = probe_size < max_probe_size ? AVPROBE_SCORE_RETRY : 0;
289 /* Read probe data. */
290 if ((ret = av_reallocp(&buf, probe_size + AVPROBE_PADDING_SIZE)) < 0)
292 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 if (ret != AVERROR_EOF)
299 ret = 0; /* error was end of file, nothing read */
303 if (buf_offset < offset)
305 pd.buf_size = buf_offset - offset;
306 pd.buf = &buf[offset];
308 memset(pd.buf + pd.buf_size, 0, AVPROBE_PADDING_SIZE);
310 /* Guess file format. */
311 *fmt = av_probe_input_format2(&pd, 1, &score);
313 /* This can only be true in the last iteration. */
314 if (score <= AVPROBE_SCORE_RETRY) {
315 av_log(logctx, AV_LOG_WARNING,
316 "Format %s detected only with low score of %d, "
317 "misdetection possible!\n", (*fmt)->name, score);
319 av_log(logctx, AV_LOG_DEBUG,
320 "Format %s probed with size=%d and score=%d\n",
321 (*fmt)->name, probe_size, score);
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);
331 ret = AVERROR_INVALIDDATA;
334 /* Rewind. Reuse probe buffer to avoid seeking. */
335 ret2 = ffio_rewind_with_probe_data(pb, &buf, buf_offset);
339 av_freep(&pd.mime_type);
340 return ret < 0 ? ret : score;
343 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)
347 int ret = av_probe_input_buffer2(pb, fmt, filename, logctx, offset, max_probe_size);
348 return ret < 0 ? ret : 0;