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avformat/hls: support for seeking on event playlists

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This allows clients to seek between first played segment
and the last one in the live stream playlist with #EXT-X-PLAYLIST-TYPE:EVENT attribute.
This commit is contained in:
Vladlen Y. Koshelev 2014-01-05 02:18:12 +04:00 committed by Anssi Hannula
parent f29cb45bf2
commit cdbd9e218d
1 changed files with 26 additions and 3 deletions
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29
libavformat/hls.c
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@ -76,6 +76,12 @@ struct segment {
struct rendition; struct rendition;
enum PlaylistType {
PLS_TYPE_UNSPECIFIED,
PLS_TYPE_EVENT,
PLS_TYPE_VOD
};
/* /*
* Each playlist has its own demuxer. If it currently is active, * Each playlist has its own demuxer. If it currently is active,
* it has an open AVIOContext too, and potentially an AVPacket * it has an open AVIOContext too, and potentially an AVPacket
@ -93,6 +99,7 @@ struct playlist {
int stream_offset; int stream_offset;
int finished; int finished;
enum PlaylistType type;
int64_t target_duration; int64_t target_duration;
int start_seq_no; int start_seq_no;
int n_segments; int n_segments;
@ -528,6 +535,7 @@ static int parse_playlist(HLSContext *c, const char *url,
if (pls) { if (pls) {
free_segment_list(pls); free_segment_list(pls);
pls->finished = 0; pls->finished = 0;
pls->type = PLS_TYPE_UNSPECIFIED;
} }
while (!url_feof(in)) { while (!url_feof(in)) {
read_chomp_line(in, line, sizeof(line)); read_chomp_line(in, line, sizeof(line));
@ -564,6 +572,14 @@ static int parse_playlist(HLSContext *c, const char *url,
if (ret < 0) if (ret < 0)
goto fail; goto fail;
pls->start_seq_no = atoi(ptr); pls->start_seq_no = atoi(ptr);
} else if (av_strstart(line, "#EXT-X-PLAYLIST-TYPE:", &ptr)) {
ret = ensure_playlist(c, &pls, url);
if (ret < 0)
goto fail;
if (!strcmp(ptr, "EVENT"))
pls->type = PLS_TYPE_EVENT;
else if (!strcmp(ptr, "VOD"))
pls->type = PLS_TYPE_VOD;
} else if (av_strstart(line, "#EXT-X-ENDLIST", &ptr)) { } else if (av_strstart(line, "#EXT-X-ENDLIST", &ptr)) {
if (pls) if (pls)
pls->finished = 1; pls->finished = 1;
@ -1584,17 +1600,24 @@ static int hls_read_seek(AVFormatContext *s, int stream_index,
HLSContext *c = s->priv_data; HLSContext *c = s->priv_data;
struct playlist *seek_pls = NULL; struct playlist *seek_pls = NULL;
int i, seq_no; int i, seq_no;
int64_t seek_timestamp; int64_t first_timestamp, seek_timestamp, duration;
if ((flags & AVSEEK_FLAG_BYTE) || !c->variants[0]->playlists[0]->finished) if ((flags & AVSEEK_FLAG_BYTE) ||
!(c->variants[0]->playlists[0]->finished || c->variants[0]->playlists[0]->type == PLS_TYPE_EVENT))
return AVERROR(ENOSYS); return AVERROR(ENOSYS);
first_timestamp = c->first_timestamp == AV_NOPTS_VALUE ?
0 : c->first_timestamp;
seek_timestamp = av_rescale_rnd(timestamp, AV_TIME_BASE, seek_timestamp = av_rescale_rnd(timestamp, AV_TIME_BASE,
s->streams[stream_index]->time_base.den, s->streams[stream_index]->time_base.den,
flags & AVSEEK_FLAG_BACKWARD ? flags & AVSEEK_FLAG_BACKWARD ?
AV_ROUND_DOWN : AV_ROUND_UP); AV_ROUND_DOWN : AV_ROUND_UP);
if (s->duration < seek_timestamp) duration = s->duration == AV_NOPTS_VALUE ?
0 : s->duration;
if (0 < duration && duration < seek_timestamp - first_timestamp)
return AVERROR(EIO); return AVERROR(EIO);
/* find the playlist with the specified stream */ /* find the playlist with the specified stream */