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author | Michael Niedermayer <michaelni@gmx.at> | 2014-03-01 23:09:40 +0100 |
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committer | Michael Niedermayer <michaelni@gmx.at> | 2014-03-01 23:57:40 +0100 |
commit | 9600486d10a9728f1503363334268ecfafa9b0e5 (patch) | |
tree | 08bd28641d97631952f43bde89c7e52bb7a7772e /libavformat/aviobuf.c | |
parent | 2adf422ce24bd8038d5d2f50549d0d3fb4170171 (diff) | |
download | ffmpeg-9600486d10a9728f1503363334268ecfafa9b0e5.tar.gz |
avformat/aviobuf: optimize sequential backward seeking
This reduces the number of protocol seeks
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavformat/aviobuf.c')
-rw-r--r-- | libavformat/aviobuf.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/libavformat/aviobuf.c b/libavformat/aviobuf.c index 18431e7086..95fdf200ef 100644 --- a/libavformat/aviobuf.c +++ b/libavformat/aviobuf.c @@ -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; |