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Enhance HLS seeking.

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Enhances seeking by demuxing until the requested timestamp is reached within
the segment selected by the seek code using the playlist info.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Panagiotis H.M. Issaris 2012-01-10 14:48:57 +01:00 committed by Michael Niedermayer
parent ebc9ff8e7d
commit 811de351ea
1 changed files with 50 additions and 8 deletions
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58
libavformat/applehttp.c
View File

@ -100,6 +100,8 @@ typedef struct AppleHTTPContext {
int end_of_segment;
int first_packet;
int64_t first_timestamp;
int64_t seek_timestamp;
int seek_flags;
AVIOInterruptCB *interrupt_callback;
} AppleHTTPContext;
@ -545,6 +547,7 @@ static int applehttp_read_header(AVFormatContext *s, AVFormatParameters *ap)
c->first_packet = 1;
c->first_timestamp = AV_NOPTS_VALUE;
c->seek_timestamp = AV_NOPTS_VALUE;
return 0;
fail:
@ -604,14 +607,44 @@ start:
/* Make sure we've got one buffered packet from each open variant
* stream */
if (var->needed && !var->pkt.data) {
ret = av_read_frame(var->ctx, &var->pkt);
if (ret < 0) {
if (!url_feof(&var->pb))
return ret;
reset_packet(&var->pkt);
} else {
if (c->first_timestamp == AV_NOPTS_VALUE)
c->first_timestamp = var->pkt.dts;
while (1) {
int64_t ts_diff;
ret = av_read_frame(var->ctx, &var->pkt);
if (ret < 0) {
if (!url_feof(&var->pb)) {
return ret;
} else {
if ((var->cur_seq_no - var->start_seq_no) == (var->n_segments)) {
return AVERROR_EOF;
}
}
reset_packet(&var->pkt);
} else {
if (c->first_timestamp == AV_NOPTS_VALUE)
c->first_timestamp = var->pkt.dts;
}
if (c->seek_timestamp == AV_NOPTS_VALUE)
break;
if (var->pkt.dts == AV_NOPTS_VALUE) {
c->seek_timestamp = AV_NOPTS_VALUE;
break;
}
ts_diff = var->pkt.dts - c->seek_timestamp;
if (ts_diff >= 0) {
if (c->seek_flags & AVSEEK_FLAG_ANY) {
c->seek_timestamp = AV_NOPTS_VALUE;
break;
}
/* Seek to keyframe */
if (var->pkt.flags & AV_PKT_FLAG_KEY) {
c->seek_timestamp = AV_NOPTS_VALUE;
break;
}
}
}
}
/* Check if this stream has the packet with the lowest dts */
@ -652,10 +685,17 @@ static int applehttp_read_seek(AVFormatContext *s, int stream_index,
if ((flags & AVSEEK_FLAG_BYTE) || !c->variants[0]->finished)
return AVERROR(ENOSYS);
c->seek_timestamp = timestamp;
c->seek_flags = flags;
timestamp = av_rescale_rnd(timestamp, 1, stream_index >= 0 ?
s->streams[stream_index]->time_base.den :
AV_TIME_BASE, flags & AVSEEK_FLAG_BACKWARD ?
AV_ROUND_DOWN : AV_ROUND_UP);
if (s->duration < c->seek_timestamp) {
c->seek_timestamp = AV_NOPTS_VALUE;
return AVERROR(EIO);
}
ret = AVERROR(EIO);
for (i = 0; i < c->n_variants; i++) {
/* Reset reading */
@ -683,6 +723,8 @@ static int applehttp_read_seek(AVFormatContext *s, int stream_index,
}
pos += var->segments[j]->duration;
}
if (ret != 0)
c->seek_timestamp = AV_NOPTS_VALUE;
}
return ret;
}