[FFmpeg-cvslog] ffmdec: handle wrapped file in ffm_seek
Yan Jing
git at videolan.org
Thu Sep 8 21:01:47 CEST 2011
ffmpeg | branch: master | Yan Jing <yanjng at 21cn.com> | Thu Sep 8 20:09:40 2011 +0200| [59810f8388ab4e746229b2e0048aa9eb4f36bdd7] | committer: Michael Niedermayer
ffmdec: handle wrapped file in ffm_seek
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=59810f8388ab4e746229b2e0048aa9eb4f36bdd7
---
libavformat/ffmdec.c | 18 ++++++++++++++++--
1 files changed, 16 insertions(+), 2 deletions(-)
diff --git a/libavformat/ffmdec.c b/libavformat/ffmdec.c
index 2fd154f..0747f8d 100644
--- a/libavformat/ffmdec.c
+++ b/libavformat/ffmdec.c
@@ -461,11 +461,25 @@ static int ffm_seek(AVFormatContext *s, int stream_index, int64_t wanted_pts, in
av_dlog(s, "wanted_pts=%0.6f\n", wanted_pts / 1000000.0);
/* find the position using linear interpolation (better than
dichotomy in typical cases) */
- pos_min = FFM_PACKET_SIZE;
- pos_max = ffm->file_size - FFM_PACKET_SIZE;
+ if (ffm->write_index < ffm->file_size) {
+ if (get_dts(s, FFM_PACKET_SIZE) < wanted_pts) {
+ pos_min = FFM_PACKET_SIZE;
+ pos_max = ffm->write_index - FFM_PACKET_SIZE;
+ } else {
+ pos_min = ffm->write_index;
+ pos_max = ffm->file_size - FFM_PACKET_SIZE;
+ }
+ } else {
+ pos_min = FFM_PACKET_SIZE;
+ pos_max = ffm->file_size - FFM_PACKET_SIZE;
+ }
while (pos_min <= pos_max) {
pts_min = get_dts(s, pos_min);
pts_max = get_dts(s, pos_max);
+ if (pts_min > wanted_pts || pts_max < wanted_pts) {
+ pos = pts_min > wanted_pts ? pos_min : pos_max;
+ goto found;
+ }
/* linear interpolation */
pos1 = (double)(pos_max - pos_min) * (double)(wanted_pts - pts_min) /
(double)(pts_max - pts_min);
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