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Implement librtmp seek support.

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Implement flv_read_seek(), add a missing check on stream_index
and fix timestamp rounding in rtmp_read_seek().

Also add the flv_read_seek2() function, which is not enabled but is
useful as reference.
To actually implement flv_read_seek2() correctly, there would need to
be some corresponding av_url_read_fseek2() function to propagate the
timestamps down to the ByteIOContext and URLContext.

Patch by Howard Chu <hyc <at> highlandsun.com>.

See the thread:
Subject: [FFmpeg-devel] RTMP seek support
Date: 2010-03-28 23:35:02 GMT

Originally committed as revision 22904 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Howard Chu 2010-04-18 19:09:25 +00:00 committed by Stefano Sabatini
parent d79fc8403b
commit fc8fa007fb
2 changed files with 41 additions and 1 deletions
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37
libavformat/flvdec.c
View File

@ -449,6 +449,39 @@ leave:
return ret;
}
static int flv_read_seek(AVFormatContext *s, int stream_index,
int64_t ts, int flags)
{
return av_url_read_fseek(s->pb, stream_index, ts, flags);
}
#if 0 /* don't know enough to implement this */
static int flv_read_seek2(AVFormatContext *s, int stream_index,
int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
{
int ret = AVERROR(ENOSYS);
if (ts - min_ts > (uint64_t)(max_ts - ts)) flags |= AVSEEK_FLAG_BACKWARD;
if (url_is_streamed(s->pb)) {
if (stream_index < 0) {
stream_index = av_find_default_stream_index(s);
if (stream_index < 0)
return -1;
/* timestamp for default must be expressed in AV_TIME_BASE units */
ts = av_rescale_rnd(ts, 1000, AV_TIME_BASE,
flags & AVSEEK_FLAG_BACKWARD ? AV_ROUND_DOWN : AV_ROUND_UP);
}
ret = av_url_read_fseek(s->pb, stream_index, ts, flags);
}
if (ret == AVERROR(ENOSYS))
ret = av_seek_frame(s, stream_index, ts, flags);
return ret;
}
#endif
AVInputFormat flv_demuxer = {
"flv",
NULL_IF_CONFIG_SMALL("FLV format"),
@ -456,6 +489,10 @@ AVInputFormat flv_demuxer = {
flv_probe,
flv_read_header,
flv_read_packet,
.read_seek = flv_read_seek,
#if 0
.read_seek2 = flv_read_seek2,
#endif
.extensions = "flv",
.value = CODEC_ID_FLV1,
};

5
libavformat/librtmp.c
View File

@ -144,7 +144,10 @@ static int64_t rtmp_read_seek(URLContext *s, int stream_index,
return AVERROR(ENOSYS);
/* seeks are in milliseconds */
timestamp = av_rescale(timestamp, AV_TIME_BASE, 1000);
if (stream_index < 0)
timestamp = av_rescale_rnd(timestamp, 1000, AV_TIME_BASE,
flags & AVSEEK_FLAG_BACKWARD ? AV_ROUND_DOWN : AV_ROUND_UP);
if (!RTMP_SendSeek(r, timestamp))
return -1;
return timestamp;