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Code Issues Releases Activity

Revert "Move the probe loop from av_open_input_file() into its own method"

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This reverts r22296.  This change made some files to fail to open.
The patch submitter has promised to investigate next week.

Originally committed as revision 22315 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Måns Rullgård 2010-03-08 03:46:37 +00:00
parent 1250fcc862
commit f19341e17a
2 changed files with 31 additions and 82 deletions
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20
libavformat/internal.h
View File

@ -37,24 +37,4 @@ void ff_interleave_add_packet(AVFormatContext *s, AVPacket *pkt,
void av_read_frame_flush(AVFormatContext *s);
/**
* Probes a bytestream to determine the input format. Each time a
* probe returns with a score that is too low, the probe buffer size
* is increased and another attempt is made. When the maximum probe
* size is reached, the input format with the highest score is
* returned.
*
* @param pb the bytestream to probe, it may be closed and opened again
* @param fmt the input format is put here
* @param filename the filename of the stream
* @param logctx the log context
* @param offset the offset within the bytestream to probe from
* @param max_probe_size the maximum probe buffer size (zero for default)
* @return 0 if OK, a negative value corresponding to an AVERROR(xxx)
* code otherwise
*/
int ff_probe_input_buffer(ByteIOContext **pb, AVInputFormat **fmt,
const char *filename, void *logctx,
unsigned int offset, unsigned int max_probe_size);
#endif /* AVFORMAT_INTERNAL_H */

91
libavformat/utils.c
View File

@ -465,71 +465,12 @@ int av_open_input_stream(AVFormatContext **ic_ptr,
#define PROBE_BUF_MIN 2048
#define PROBE_BUF_MAX (1<<20)
int ff_probe_input_buffer(ByteIOContext **pb, AVInputFormat **fmt,
const char *filename, void *logctx,
unsigned int offset, unsigned int max_probe_size)
{
AVProbeData pd = { filename ? filename : "", NULL, -offset };
unsigned char *buf = NULL;
int probe_size;
if (!max_probe_size) {
max_probe_size = PROBE_BUF_MAX;
} else if (max_probe_size > PROBE_BUF_MAX) {
max_probe_size = PROBE_BUF_MAX;
} else if (max_probe_size < PROBE_BUF_MIN) {
return AVERROR(EINVAL);
}
if (offset >= max_probe_size) {
return AVERROR(EINVAL);
}
for(probe_size= PROBE_BUF_MIN; probe_size<=max_probe_size && !*fmt; probe_size<<=1){
int ret, score = probe_size < max_probe_size ? AVPROBE_SCORE_MAX/4 : 0;
int buf_offset = (probe_size == PROBE_BUF_MIN) ? 0 : probe_size>>1;
if (probe_size < offset) {
continue;
}
/* read probe data */
buf = av_realloc(buf, probe_size + AVPROBE_PADDING_SIZE);
if ((ret = get_buffer(*pb, buf + buf_offset, probe_size - buf_offset)) < 0) {
av_free(buf);
return ret;
}
pd.buf_size += ret;
pd.buf = &buf[offset];
memset(pd.buf + pd.buf_size, 0, AVPROBE_PADDING_SIZE);
/* guess file format */
*fmt = av_probe_input_format2(&pd, 1, &score);
if(*fmt){
if(score <= AVPROBE_SCORE_MAX/4){ //this can only be true in the last iteration
av_log(logctx, AV_LOG_WARNING, "Format detected only with low score of %d, misdetection possible!\n", score);
}else
av_log(logctx, AV_LOG_DEBUG, "Probed with size=%d and score=%d\n", probe_size, score);
}
}
av_free(buf);
if (url_fseek(*pb, 0, SEEK_SET) < 0) {
url_fclose(*pb);
if (url_fopen(pb, filename, URL_RDONLY) < 0)
return AVERROR(EIO);
}
return 0;
}
int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
AVInputFormat *fmt,
int buf_size,
AVFormatParameters *ap)
{
int err;
int err, probe_size;
AVProbeData probe_data, *pd = &probe_data;
ByteIOContext *pb = NULL;
void *logctx= ap && ap->prealloced_context ? *ic_ptr : NULL;
@ -555,9 +496,37 @@ int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
if (buf_size > 0) {
url_setbufsize(pb, buf_size);
}
if ((err = ff_probe_input_buffer(&pb, &fmt, filename, logctx, 0, 0)) < 0) {
for(probe_size= PROBE_BUF_MIN; probe_size<=PROBE_BUF_MAX && !fmt; probe_size<<=1){
int score= probe_size < PROBE_BUF_MAX ? AVPROBE_SCORE_MAX/4 : 0;
/* read probe data */
pd->buf= av_realloc(pd->buf, probe_size + AVPROBE_PADDING_SIZE);
pd->buf_size = get_buffer(pb, pd->buf, probe_size);
if ((int)pd->buf_size < 0) {
err = pd->buf_size;
goto fail;
}
memset(pd->buf+pd->buf_size, 0, AVPROBE_PADDING_SIZE);
if (url_fseek(pb, 0, SEEK_SET) < 0) {
url_fclose(pb);
if (url_fopen(&pb, filename, URL_RDONLY) < 0) {
pb = NULL;
err = AVERROR(EIO);
goto fail;
}
}
/* guess file format */
fmt = av_probe_input_format2(pd, 1, &score);
if(fmt){
if(score <= AVPROBE_SCORE_MAX/4){ //this can only be true in the last iteration
av_log(logctx, AV_LOG_WARNING, "Format detected only with low score of %d, misdetection possible!\n", score);
}else
av_log(logctx, AV_LOG_DEBUG, "Probed with size=%d and score=%d\n", probe_size, score);
}
}
av_freep(&pd->buf);
}
/* if still no format found, error */