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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>
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1 parent 2adf422 commit 9600486d10a9728f1503363334268ecfafa9b0e5 @michaelni michaelni committed Mar 1, 2014
Showing with 12 additions and 1 deletion.
  1. +12 −1 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;

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