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Code Issues Releases Activity

avformat/hls: track seeking on a per-playlist basis

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Seeking needs to be tracked on a per-playlist basis, since the resyncing
code in hls_read_packet() has to sync each playlist to the seek
timestamp instead of stopping after the first playlist has reached it.

Signed-off-by: Anssi Hannula <anssi.hannula@iki.fi>
This commit is contained in:
Anssi Hannula 2013-12-30 11:13:56 +02:00
parent 01b184e68d
commit 61e1a70278
1 changed files with 69 additions and 37 deletions
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106
libavformat/hls.c
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@ -117,6 +117,9 @@ struct playlist {
int id3_changed; /* ID3 tag data has changed at some point */
ID3v2ExtraMeta *id3_deferred_extra; /* stored here until subdemuxer is opened */
int64_t seek_timestamp;
int seek_flags;
/* Renditions associated with this playlist, if any.
* Alternative rendition playlists have a single rendition associated
* with them, and variant main Media Playlists may have
@ -164,8 +167,6 @@ typedef struct HLSContext {
int end_of_segment;
int first_packet;
int64_t first_timestamp;
int64_t seek_timestamp;
int seek_flags;
AVIOInterruptCB *interrupt_callback;
char *user_agent; ///< holds HTTP user agent set as an AVOption to the HTTP protocol context
char *cookies; ///< holds HTTP cookie values set in either the initial response or as an AVOption to the HTTP protocol context
@ -254,6 +255,7 @@ static struct playlist *new_playlist(HLSContext *c, const char *url,
return NULL;
reset_packet(&pls->pkt);
ff_make_absolute_url(pls->url, sizeof(pls->url), base, url);
pls->seek_timestamp = AV_NOPTS_VALUE;
pls->is_id3_timestamped = -1;
pls->id3_mpegts_timestamp = AV_NOPTS_VALUE;
@ -1111,6 +1113,34 @@ static void add_metadata_from_renditions(AVFormatContext *s, struct playlist *pl
}
}
/* if timestamp was in valid range: returns 1 and sets seq_no
* if not: returns 0 and sets seq_no to closest segment */
static int find_timestamp_in_playlist(HLSContext *c, struct playlist *pls,
int64_t timestamp, int *seq_no)
{
int i;
int64_t pos = c->first_timestamp == AV_NOPTS_VALUE ?
0 : c->first_timestamp;
if (timestamp < pos) {
*seq_no = pls->start_seq_no;
return 0;
}
for (i = 0; i < pls->n_segments; i++) {
int64_t diff = pos + pls->segments[i]->duration - timestamp;
if (diff > 0) {
*seq_no = pls->start_seq_no + i;
return 1;
}
pos += pls->segments[i]->duration;
}
*seq_no = pls->start_seq_no + pls->n_segments - 1;
return 0;
}
static int hls_read_header(AVFormatContext *s)
{
URLContext *u = (s->flags & AVFMT_FLAG_CUSTOM_IO) ? NULL : s->pb->opaque;
@ -1302,7 +1332,6 @@ static int hls_read_header(AVFormatContext *s)
c->first_packet = 1;
c->first_timestamp = AV_NOPTS_VALUE;
c->seek_timestamp = AV_NOPTS_VALUE;
return 0;
fail:
@ -1419,21 +1448,21 @@ start:
get_timebase(pls), AV_TIME_BASE_Q);
}
if (c->seek_timestamp == AV_NOPTS_VALUE)
if (pls->seek_timestamp == AV_NOPTS_VALUE)
break;
if (pls->pkt.dts == AV_NOPTS_VALUE) {
c->seek_timestamp = AV_NOPTS_VALUE;
pls->seek_timestamp = AV_NOPTS_VALUE;
break;
}
tb = get_timebase(pls);
ts_diff = av_rescale_rnd(pls->pkt.dts, AV_TIME_BASE,
tb.den, AV_ROUND_DOWN) -
c->seek_timestamp;
if (ts_diff >= 0 && (c->seek_flags & AVSEEK_FLAG_ANY ||
pls->seek_timestamp;
if (ts_diff >= 0 && (pls->seek_flags & AVSEEK_FLAG_ANY ||
pls->pkt.flags & AV_PKT_FLAG_KEY)) {
c->seek_timestamp = AV_NOPTS_VALUE;
pls->seek_timestamp = AV_NOPTS_VALUE;
break;
}
av_free_packet(&pls->pkt);
@ -1498,32 +1527,40 @@ static int hls_read_seek(AVFormatContext *s, int stream_index,
int64_t timestamp, int flags)
{
HLSContext *c = s->priv_data;
int i, j, ret;
int i;
int64_t seek_timestamp;
int valid_for = -1;
if ((flags & AVSEEK_FLAG_BYTE) || !c->variants[0]->playlists[0]->finished)
return AVERROR(ENOSYS);
c->seek_flags = flags;
c->seek_timestamp = stream_index < 0 ? timestamp :
av_rescale_rnd(timestamp, AV_TIME_BASE,
s->streams[stream_index]->time_base.den,
flags & AVSEEK_FLAG_BACKWARD ?
AV_ROUND_DOWN : AV_ROUND_UP);
timestamp = av_rescale_rnd(timestamp, AV_TIME_BASE, 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;
seek_timestamp = stream_index < 0 ? timestamp :
av_rescale_rnd(timestamp, AV_TIME_BASE,
s->streams[stream_index]->time_base.den,
flags & AVSEEK_FLAG_BACKWARD ?
AV_ROUND_DOWN : AV_ROUND_UP);
if (s->duration < seek_timestamp)
return AVERROR(EIO);
for (i = 0; i < c->n_playlists; i++) {
/* check first that the timestamp is valid for some playlist */
struct playlist *pls = c->playlists[i];
int seq_no;
if (find_timestamp_in_playlist(c, pls, seek_timestamp, &seq_no)) {
/* set segment now so we do not need to search again below */
pls->cur_seq_no = seq_no;
valid_for = i;
break;
}
}
ret = AVERROR(EIO);
if (valid_for < 0)
return AVERROR(EIO);
for (i = 0; i < c->n_playlists; i++) {
/* Reset reading */
struct playlist *pls = c->playlists[i];
int64_t pos = c->first_timestamp == AV_NOPTS_VALUE ?
0 : c->first_timestamp;
if (pls->input) {
ffurl_close(pls->input);
pls->input = NULL;
@ -1536,20 +1573,15 @@ static int hls_read_seek(AVFormatContext *s, int stream_index,
/* Reset the pos, to let the mpegts demuxer know we've seeked. */
pls->pb.pos = 0;
/* Locate the segment that contains the target timestamp */
for (j = 0; j < pls->n_segments; j++) {
if (timestamp >= pos &&
timestamp < pos + pls->segments[j]->duration) {
pls->cur_seq_no = pls->start_seq_no + j;
ret = 0;
break;
}
pos += pls->segments[j]->duration;
}
if (ret)
c->seek_timestamp = AV_NOPTS_VALUE;
pls->seek_timestamp = seek_timestamp;
pls->seek_flags = flags;
/* set closest segment seq_no for playlists not handled above */
if (valid_for != i)
find_timestamp_in_playlist(c, pls, seek_timestamp, &pls->cur_seq_no);
}
return ret;
return 0;
}
static int hls_probe(AVProbeData *p)