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Code Issues Releases Activity

avidec: calculate missing bitrates from index

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-03-11 19:04:45 +01:00
parent 52b6db848d
commit 01000064c9
1 changed files with 41 additions and 0 deletions
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41
libavformat/avidec.c
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@ -379,6 +379,46 @@ static void avi_read_nikon(AVFormatContext *s, uint64_t end)
}
}
static int calculate_bitrate(AVFormatContext *s)
{
AVIContext *avi = s->priv_data;
int i, j;
int64_t lensum = 0;
int64_t maxpos = 0;
for (i = 0; i<s->nb_streams; i++) {
int64_t len = 0;
AVStream *st = s->streams[i];
if (!st->nb_index_entries)
continue;
for (j = 0; j < st->nb_index_entries; j++)
len += st->index_entries[j].size;
maxpos = FFMAX(maxpos, st->index_entries[j-1].pos);
lensum += len;
}
if (maxpos < avi->io_fsize*9/10) // index doesnt cover the whole file
return 0;
if (lensum*9/10 > maxpos || lensum < maxpos*9/10) // frame sum and filesize mismatch
return 0;
for (i = 0; i<s->nb_streams; i++) {
int64_t len = 0;
AVStream *st = s->streams[i];
int64_t duration;
for (j = 0; j < st->nb_index_entries; j++)
len += st->index_entries[j].size;
if (st->nb_index_entries < 2 || st->codec->bit_rate > 0)
continue;
duration = st->index_entries[j-1].timestamp - st->index_entries[0].timestamp;
st->codec->bit_rate = av_rescale(8*len, st->time_base.den, duration * st->time_base.num);
}
return 1;
}
static int avi_read_header(AVFormatContext *s)
{
AVIContext *avi = s->priv_data;
@ -863,6 +903,7 @@ fail:
if (!avi->index_loaded && pb->seekable)
avi_load_index(s);
calculate_bitrate(s);
avi->index_loaded |= 1;
avi->non_interleaved |= guess_ni_flag(s) | (s->flags & AVFMT_FLAG_SORT_DTS);