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
37 /** head of registered input format linked list */
38 static AVInputFormat *first_iformat = NULL;
39 /** head of registered output format linked list */
40 static AVOutputFormat *first_oformat = NULL;
42 static AVInputFormat **last_iformat = &first_iformat;
43 static AVOutputFormat **last_oformat = &first_oformat;
45 AVInputFormat *av_iformat_next(const AVInputFormat *f)
53 AVOutputFormat *av_oformat_next(const AVOutputFormat *f)
61 static AVMutex iformat_register_mutex = AV_MUTEX_INITIALIZER;
63 void av_register_input_format(AVInputFormat *format)
67 ff_mutex_lock(&iformat_register_mutex);
74 last_iformat = &format->next;
76 ff_mutex_unlock(&iformat_register_mutex);
79 static AVMutex oformat_register_mutex = AV_MUTEX_INITIALIZER;
81 void av_register_output_format(AVOutputFormat *format)
85 ff_mutex_lock(&oformat_register_mutex);
92 last_oformat = &format->next;
94 ff_mutex_unlock(&oformat_register_mutex);
97 int av_match_ext(const char *filename, const char *extensions)
104 ext = strrchr(filename, '.');
106 return av_match_name(ext + 1, extensions);
110 AVOutputFormat *av_guess_format(const char *short_name, const char *filename,
111 const char *mime_type)
113 AVOutputFormat *fmt = NULL, *fmt_found;
114 int score_max, score;
116 /* specific test for image sequences */
117 #if CONFIG_IMAGE2_MUXER
118 if (!short_name && filename &&
119 av_filename_number_test(filename) &&
120 ff_guess_image2_codec(filename) != AV_CODEC_ID_NONE) {
121 return av_guess_format("image2", NULL, NULL);
124 /* Find the proper file type. */
127 while ((fmt = av_oformat_next(fmt))) {
129 if (fmt->name && short_name && av_match_name(short_name, fmt->name))
131 if (fmt->mime_type && mime_type && !strcmp(fmt->mime_type, mime_type))
133 if (filename && fmt->extensions &&
134 av_match_ext(filename, fmt->extensions)) {
137 if (score > score_max) {
145 enum AVCodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
146 const char *filename, const char *mime_type,
147 enum AVMediaType type)
149 if (av_match_name("segment", fmt->name) || av_match_name("ssegment", fmt->name)) {
150 AVOutputFormat *fmt2 = av_guess_format(NULL, filename, NULL);
155 if (type == AVMEDIA_TYPE_VIDEO) {
156 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
158 #if CONFIG_IMAGE2_MUXER
159 if (!strcmp(fmt->name, "image2") || !strcmp(fmt->name, "image2pipe")) {
160 codec_id = ff_guess_image2_codec(filename);
163 if (codec_id == AV_CODEC_ID_NONE)
164 codec_id = fmt->video_codec;
166 } else if (type == AVMEDIA_TYPE_AUDIO)
167 return fmt->audio_codec;
168 else if (type == AVMEDIA_TYPE_SUBTITLE)
169 return fmt->subtitle_codec;
170 else if (type == AVMEDIA_TYPE_DATA)
171 return fmt->data_codec;
173 return AV_CODEC_ID_NONE;
176 AVInputFormat *av_find_input_format(const char *short_name)
178 AVInputFormat *fmt = NULL;
179 while ((fmt = av_iformat_next(fmt)))
180 if (av_match_name(short_name, fmt->name))
185 AVInputFormat *av_probe_input_format3(AVProbeData *pd, int is_opened,
188 AVProbeData lpd = *pd;
189 AVInputFormat *fmt1 = NULL, *fmt;
190 int score, score_max = 0;
191 const static uint8_t zerobuffer[AVPROBE_PADDING_SIZE];
194 ID3_ALMOST_GREATER_PROBE,
196 ID3_GREATER_MAX_PROBE,
200 lpd.buf = (unsigned char *) zerobuffer;
202 if (lpd.buf_size > 10 && ff_id3v2_match(lpd.buf, ID3v2_DEFAULT_MAGIC)) {
203 int id3len = ff_id3v2_tag_len(lpd.buf);
204 if (lpd.buf_size > id3len + 16) {
205 if (lpd.buf_size < 2LL*id3len + 16)
206 nodat = ID3_ALMOST_GREATER_PROBE;
208 lpd.buf_size -= id3len;
209 } else if (id3len >= PROBE_BUF_MAX) {
210 nodat = ID3_GREATER_MAX_PROBE;
212 nodat = ID3_GREATER_PROBE;
216 while ((fmt1 = av_iformat_next(fmt1))) {
217 if (!is_opened == !(fmt1->flags & AVFMT_NOFILE) && strcmp(fmt1->name, "image2"))
220 if (fmt1->read_probe) {
221 score = fmt1->read_probe(&lpd);
223 av_log(NULL, AV_LOG_TRACE, "Probing %s score:%d size:%d\n", fmt1->name, score, lpd.buf_size);
224 if (fmt1->extensions && av_match_ext(lpd.filename, fmt1->extensions)) {
227 score = FFMAX(score, 1);
229 case ID3_GREATER_PROBE:
230 case ID3_ALMOST_GREATER_PROBE:
231 score = FFMAX(score, AVPROBE_SCORE_EXTENSION / 2 - 1);
233 case ID3_GREATER_MAX_PROBE:
234 score = FFMAX(score, AVPROBE_SCORE_EXTENSION);
238 } else if (fmt1->extensions) {
239 if (av_match_ext(lpd.filename, fmt1->extensions))
240 score = AVPROBE_SCORE_EXTENSION;
242 if (av_match_name(lpd.mime_type, fmt1->mime_type)) {
243 if (AVPROBE_SCORE_MIME > score) {
244 av_log(NULL, AV_LOG_DEBUG, "Probing %s score:%d increased to %d due to MIME type\n", fmt1->name, score, AVPROBE_SCORE_MIME);
245 score = AVPROBE_SCORE_MIME;
248 if (score > score_max) {
251 } else if (score == score_max)
254 if (nodat == ID3_GREATER_PROBE)
255 score_max = FFMIN(AVPROBE_SCORE_EXTENSION / 2 - 1, score_max);
256 *score_ret = score_max;
261 AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max)
264 AVInputFormat *fmt = av_probe_input_format3(pd, is_opened, &score_ret);
265 if (score_ret > *score_max) {
266 *score_max = score_ret;
272 AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened)
275 return av_probe_input_format2(pd, is_opened, &score);
278 int av_probe_input_buffer2(AVIOContext *pb, AVInputFormat **fmt,
279 const char *filename, void *logctx,
280 unsigned int offset, unsigned int max_probe_size)
282 AVProbeData pd = { filename ? filename : "" };
284 int ret = 0, probe_size, buf_offset = 0;
289 max_probe_size = PROBE_BUF_MAX;
290 else if (max_probe_size < PROBE_BUF_MIN) {
291 av_log(logctx, AV_LOG_ERROR,
292 "Specified probe size value %u cannot be < %u\n", max_probe_size, PROBE_BUF_MIN);
293 return AVERROR(EINVAL);
296 if (offset >= max_probe_size)
297 return AVERROR(EINVAL);
300 uint8_t *mime_type_opt = NULL;
302 av_opt_get(pb, "mime_type", AV_OPT_SEARCH_CHILDREN, &mime_type_opt);
303 pd.mime_type = (const char *)mime_type_opt;
304 semi = pd.mime_type ? strchr(pd.mime_type, ';') : NULL;
310 if (!*fmt && pb->av_class && av_opt_get(pb, "mime_type", AV_OPT_SEARCH_CHILDREN, &mime_type) >= 0 && mime_type) {
311 if (!av_strcasecmp(mime_type, "audio/aacp")) {
312 *fmt = av_find_input_format("aac");
314 av_freep(&mime_type);
318 for (probe_size = PROBE_BUF_MIN; probe_size <= max_probe_size && !*fmt;
319 probe_size = FFMIN(probe_size << 1,
320 FFMAX(max_probe_size, probe_size + 1))) {
321 score = probe_size < max_probe_size ? AVPROBE_SCORE_RETRY : 0;
323 /* Read probe data. */
324 if ((ret = av_reallocp(&buf, probe_size + AVPROBE_PADDING_SIZE)) < 0)
326 if ((ret = avio_read(pb, buf + buf_offset,
327 probe_size - buf_offset)) < 0) {
328 /* Fail if error was not end of file, otherwise, lower score. */
329 if (ret != AVERROR_EOF)
333 ret = 0; /* error was end of file, nothing read */
336 if (buf_offset < offset)
338 pd.buf_size = buf_offset - offset;
339 pd.buf = &buf[offset];
341 memset(pd.buf + pd.buf_size, 0, AVPROBE_PADDING_SIZE);
343 /* Guess file format. */
344 *fmt = av_probe_input_format2(&pd, 1, &score);
346 /* This can only be true in the last iteration. */
347 if (score <= AVPROBE_SCORE_RETRY) {
348 av_log(logctx, AV_LOG_WARNING,
349 "Format %s detected only with low score of %d, "
350 "misdetection possible!\n", (*fmt)->name, score);
352 av_log(logctx, AV_LOG_DEBUG,
353 "Format %s probed with size=%d and score=%d\n",
354 (*fmt)->name, probe_size, score);
356 FILE *f = fopen("probestat.tmp", "ab");
357 fprintf(f, "probe_size:%d format:%s score:%d filename:%s\n", probe_size, (*fmt)->name, score, filename);
364 ret = AVERROR_INVALIDDATA;
367 /* Rewind. Reuse probe buffer to avoid seeking. */
368 ret2 = ffio_rewind_with_probe_data(pb, &buf, buf_offset);
372 av_freep(&pd.mime_type);
373 return ret < 0 ? ret : score;
376 int av_probe_input_buffer(AVIOContext *pb, AVInputFormat **fmt,
377 const char *filename, void *logctx,
378 unsigned int offset, unsigned int max_probe_size)
380 int ret = av_probe_input_buffer2(pb, fmt, filename, logctx, offset, max_probe_size);
381 return ret < 0 ? ret : 0;