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avformat/hls: allow seeking within live playlists

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Live (and EVENT) playlists are seekable within the currently known
segment list. Seeks before the list start clamp to the oldest segment,
past the end to the live edge. Live playlist can evict old segments, we
track that by reading EXT-X-MEDIA-SEQUENCE. Previusly the code assumed
that the live playlist, don't have past segments, however some servers
has very deep usable timeshift.

Signed-off-by: Kacper Michajłow <kasper93@gmail.com>
This commit is contained in:
Kacper Michajłow
2026-07-08 03:51:44 +02:00
parent 2526ac4771
commit ede944b362
1 changed files with 23 additions and 9 deletions
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32
libavformat/hls.c
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@@ -1165,8 +1165,7 @@ fail:
ff_format_io_close(c->ctx, &in);
c->ctx->ctx_flags = c->ctx->ctx_flags & ~(unsigned)AVFMTCTX_UNSEEKABLE;
if (!c->n_variants || !c->variants[0]->n_playlists ||
!(c->variants[0]->playlists[0]->finished ||
c->variants[0]->playlists[0]->type == PLS_TYPE_EVENT))
!c->variants[0]->playlists[0]->n_segments)
c->ctx->ctx_flags |= AVFMTCTX_UNSEEKABLE;
if (c->n_variants && c->variants[0]->n_playlists &&
@@ -2070,6 +2069,12 @@ static int find_timestamp_in_playlist(HLSContext *c, struct playlist *pls,
*seq_no = pls->start_seq_no + pls->n_segments - 1;
if (!pls->finished && pls->n_segments > 0) {
if (seg_start_ts)
*seg_start_ts = pos - pls->segments[pls->n_segments - 1]->duration;
return 1;
}
return 0;
}
@@ -2907,12 +2912,6 @@ static int hls_read_seek(AVFormatContext *s, int stream_index,
s->streams[stream_index]->time_base,
AV_TIME_BASE_Q, AV_ROUND_DOWN);
duration = s->duration == AV_NOPTS_VALUE ?
0 : s->duration;
if (0 < duration && duration < seek_timestamp - first_timestamp)
return AVERROR(EIO);
/* find the playlist with the specified stream */
for (i = 0; i < c->n_playlists; i++) {
struct playlist *pls = c->playlists[i];
@@ -2924,9 +2923,20 @@ static int hls_read_seek(AVFormatContext *s, int stream_index,
}
}
}
if (!seek_pls)
return AVERROR(EIO);
duration = s->duration == AV_NOPTS_VALUE ?
0 : s->duration;
/* Only finished playlists cannot grow past the known duration. */
if (seek_pls->finished &&
0 < duration && duration < seek_timestamp - first_timestamp)
return AVERROR(EIO);
/* check if the timestamp is valid for the playlist with the
* specified stream index */
if (!seek_pls || !find_timestamp_in_playlist(c, seek_pls, seek_timestamp, &seq_no, &seg_start_ts))
if (!find_timestamp_in_playlist(c, seek_pls, seek_timestamp, &seq_no, &seg_start_ts))
return AVERROR(EIO);
if (s->streams[stream_index]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
@@ -2936,6 +2946,10 @@ static int hls_read_seek(AVFormatContext *s, int stream_index,
seek_timestamp = seg_start_ts;
}
av_log(s, AV_LOG_DEBUG, "Seek to %"PRId64" mapped to segment %"PRId64
" of playlist %d (start %"PRId64")\n",
seek_timestamp, seq_no, seek_pls->index, seg_start_ts);
/* set segment now so we do not need to search again below */
seek_pls->cur_seq_no = seq_no;
seek_pls->seek_stream_index = stream_subdemuxer_index;