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avformat/aviobuf: optimize sequential backward seeking 

This reduces the number of protocol seeks

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-03-01 23:09:40 +01:00
parent 2adf422ce2
commit 9600486d10
1 changed files with 12 additions and 1 deletions
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13
libavformat/aviobuf.c
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@ -234,9 +234,20 @@ int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
if (s->eof_reached)
return AVERROR_EOF;
s->buf_ptr = s->buf_end + offset - s->pos;
} else {
} else if(!s->write_flag && offset1 < 0 && -offset1 < buffer_size>>1 && s->seek && offset > 0) {
int64_t res;
pos -= FFMIN(buffer_size>>1, pos);
if ((res = s->seek(s->opaque, pos, SEEK_SET)) < 0)
return res;
s->buf_end =
s->buf_ptr = s->buffer;
s->pos = pos;
s->eof_reached = 0;
fill_buffer(s);
return avio_seek(s, offset, SEEK_SET | force);
} else {
int64_t res;
if (s->write_flag) {
flush_buffer(s);
s->must_flush = 1;