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avformat/hls: Sync starting segment across variants on live streams
This will avoid a large time difference between variants in the most common case.
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@ -1520,6 +1520,7 @@ static int hls_read_header(AVFormatContext *s)
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void *u = (s->flags & AVFMT_FLAG_CUSTOM_IO) ? NULL : s->pb;
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HLSContext *c = s->priv_data;
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int ret = 0, i, j, stream_offset = 0;
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int highest_cur_seq_no = 0;
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c->ctx = s;
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c->interrupt_callback = &s->interrupt_callback;
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@ -1594,6 +1595,17 @@ static int hls_read_header(AVFormatContext *s)
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add_renditions_to_variant(c, var, AVMEDIA_TYPE_SUBTITLE, var->subtitles_group);
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}
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/* Select the starting segments */
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for (i = 0; i < c->n_playlists; i++) {
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struct playlist *pls = c->playlists[i];
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if (pls->n_segments == 0)
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continue;
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pls->cur_seq_no = select_cur_seq_no(c, pls);
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highest_cur_seq_no = FFMAX(highest_cur_seq_no, pls->cur_seq_no);
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}
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/* Open the demuxer for each playlist */
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for (i = 0; i < c->n_playlists; i++) {
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struct playlist *pls = c->playlists[i];
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@ -1610,7 +1622,18 @@ static int hls_read_header(AVFormatContext *s)
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pls->index = i;
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pls->needed = 1;
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pls->parent = s;
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pls->cur_seq_no = select_cur_seq_no(c, pls);
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/*
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* If this is a live stream and this playlist looks like it is one segment
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* behind, try to sync it up so that every substream starts at the same
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* time position (so e.g. avformat_find_stream_info() will see packets from
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* all active streams within the first few seconds). This is not very generic,
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* though, as the sequence numbers are technically independent.
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*/
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if (!pls->finished && pls->cur_seq_no == highest_cur_seq_no - 1 &&
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highest_cur_seq_no < pls->start_seq_no + pls->n_segments) {
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pls->cur_seq_no = highest_cur_seq_no;
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}
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pls->read_buffer = av_malloc(INITIAL_BUFFER_SIZE);
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if (!pls->read_buffer){
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