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avformat: Use the mime type information in input probe 

It should provide a quicker guess for elementary streams provided
by http.
This commit is contained in:
Luca Barbato 2014-03-13 22:11:12 +01:00
parent 69e7336b8e
commit 3a19405d57
3 changed files with 37 additions and 12 deletions
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11
libavformat/avformat.h
View File

@ -391,9 +391,13 @@ typedef struct AVProbeData {
const char *filename;
unsigned char *buf; /**< Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero. */
int buf_size; /**< Size of buf except extra allocated bytes */
#ifdef FF_API_PROBE_MIME
uint8_t *mime_type; /**< mime_type, when known. */
#endif
} AVProbeData;
#define AVPROBE_SCORE_EXTENSION 50 ///< score for file extension
#define AVPROBE_SCORE_MIME 75 ///< score for file mime type
#define AVPROBE_SCORE_MAX 100 ///< maximum score
#define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer
@ -535,6 +539,13 @@ typedef struct AVInputFormat {
const AVClass *priv_class; ///< AVClass for the private context
/**
* Comma-separated list of mime types.
* It is used check for matching mime types while probing.
* @see av_probe_input_format2
*/
const char *mime_type;
/*****************************************************************
* No fields below this line are part of the public API. They
* may not be used outside of libavformat and can be changed and

34
libavformat/format.c
View File

@ -20,6 +20,7 @@
*/
#include "libavutil/avstring.h"
#include "libavutil/opt.h"
#include "avio_internal.h"
#include "avformat.h"
@ -194,6 +195,10 @@ AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened,
if (av_match_ext(lpd.filename, fmt1->extensions))
score = AVPROBE_SCORE_EXTENSION;
}
#ifdef FF_API_PROBE_MIME
if (av_match_name(lpd.mime_type, fmt1->mime_type))
score = FFMAX(score, AVPROBE_SCORE_EXTENSION);
#endif
if (score > *score_max) {
*score_max = score;
fmt = fmt1;
@ -251,7 +256,10 @@ int av_probe_input_buffer(AVIOContext *pb, AVInputFormat **fmt,
return AVERROR(EINVAL);
avio_skip(pb, offset);
max_probe_size -= offset;
#ifdef FF_API_PROBE_MIME
if (pb->av_class)
av_opt_get(pb, "mime_type", AV_OPT_SEARCH_CHILDREN, &pd.mime_type);
#endif
for (probe_size = PROBE_BUF_MIN; probe_size <= max_probe_size && !*fmt;
probe_size = FFMIN(probe_size << 1,
FFMAX(max_probe_size, probe_size + 1))) {
@ -259,14 +267,13 @@ int av_probe_input_buffer(AVIOContext *pb, AVInputFormat **fmt,
/* Read probe data. */
if ((ret = av_reallocp(&buf, probe_size + AVPROBE_PADDING_SIZE)) < 0)
return ret;
goto fail;
if ((ret = avio_read(pb, buf + pd.buf_size,
probe_size - pd.buf_size)) < 0) {
/* Fail if error was not end of file, otherwise, lower score. */
if (ret != AVERROR_EOF) {
av_free(buf);
return ret;
}
if (ret != AVERROR_EOF)
goto fail;
score = 0;
ret = 0; /* error was end of file, nothing read */
}
@ -289,14 +296,17 @@ int av_probe_input_buffer(AVIOContext *pb, AVInputFormat **fmt,
}
}
if (!*fmt) {
av_free(buf);
return AVERROR_INVALIDDATA;
}
if (!*fmt)
ret = AVERROR_INVALIDDATA;
fail:
/* Rewind. Reuse probe buffer to avoid seeking. */
if ((ret = ffio_rewind_with_probe_data(pb, buf, pd.buf_size)) < 0)
if (ret < 0 ||
(ret = ffio_rewind_with_probe_data(pb, buf, pd.buf_size)) < 0) {
av_free(buf);
}
#ifdef FF_API_PROBE_MIME
av_free(pd.mime_type);
#endif
return ret;
}

4
libavformat/version.h
View File

@ -61,4 +61,8 @@
#define FF_API_LAVF_CODEC_TB (LIBAVFORMAT_VERSION_MAJOR < 57)
#endif
#ifndef FF_API_PROBE_MIME
#define FF_API_PROBE_MIME (LIBAVFORMAT_VERSION_MAJOR > 55)
#endif
#endif /* AVFORMAT_VERSION_H */