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hlsdemux2: Fix position tracking

Browse source 
Remove the "pending advance" hack and instead rely on the base stream current
position to track our position (instead of a potentially NULL "current
segment").

Also ensure the media playlists are always refreshed with valid stream time,
even if there is no current segment.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2679>
This commit is contained in:
Edward Hervey 2022-05-17 07:16:48 +02:00 committed by GStreamer Marge Bot
parent 8fd2dcd266
commit 5271603852
2 changed files with 57 additions and 54 deletions
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108
subprojects/gst-plugins-good/ext/adaptivedemux2/hls/gsthlsdemux.c
View file

@ -491,9 +491,6 @@ gst_hls_demux_stream_seek (GstAdaptiveDemux2Stream * stream, gboolean forward,
}
}
/* We seeked, reset pending_advance */
hls_stream->pending_advance = FALSE;
new_position =
gst_hls_media_playlist_seek (hls_stream->playlist, forward, flags, ts);
if (new_position) {
@ -1719,13 +1716,13 @@ gst_hls_demux_advance_fragment (GstAdaptiveDemux2Stream * stream)
GST_STIME_FORMAT " uri:%s", hlsdemux_stream->current_segment->sequence,
GST_STIME_ARGS (hlsdemux_stream->current_segment->stream_time),
hlsdemux_stream->current_segment->uri);
hlsdemux_stream->pending_advance = FALSE;
return GST_FLOW_OK;
}
GST_LOG_OBJECT (stream, "Could not advance to next fragment");
if (GST_HLS_MEDIA_PLAYLIST_IS_LIVE (hlsdemux_stream->playlist)) {
hlsdemux_stream->pending_advance = TRUE;
gst_m3u8_media_segment_unref (hlsdemux_stream->current_segment);
hlsdemux_stream->current_segment = NULL;
return GST_FLOW_OK;
}
@ -1933,6 +1930,17 @@ gst_hls_demux_stream_update_media_playlist (GstHLSDemux * demux,
*uri = g_strdup (new_playlist->uri);
}
/* Synchronize playlist with previous one */
if (stream->playlist) {
if (!gst_hls_media_playlist_sync_to_playlist (new_playlist,
stream->playlist)) {
/* FIXME : We need to have a way to re-calculate sync ! */
GST_ERROR_OBJECT (stream,
"Could not synchronize new playlist with previous one !");
return FALSE;
}
}
if (stream->current_segment) {
GstM3U8MediaSegment *new_segment;
GST_DEBUG_OBJECT (stream,
@ -1961,30 +1969,25 @@ gst_hls_demux_stream_update_media_playlist (GstHLSDemux * demux,
GST_STIME_ARGS (stream->current_segment->stream_time));
} else {
/* Not finding a matching segment only happens in live (otherwise we would
* have found a match by stream time). In order to fix this, we pick a new
* starting segment, give it the current segment stream time and hope for
* the best */
GST_WARNING_OBJECT (stream,
"Could not find a matching segment, picking a new initial one");
new_segment = gst_hls_media_playlist_get_starting_segment (new_playlist);
new_segment->stream_time = stream->current_segment->stream_time;
gst_hls_media_playlist_recalculate_stream_time (new_playlist,
new_segment);
* have found a match by stream time) when we are at the live edge. This is normal*/
GST_DEBUG_OBJECT (stream, "Could not find a matching segment");
}
gst_m3u8_media_segment_unref (stream->current_segment);
stream->current_segment = new_segment;
} else {
GST_DEBUG_OBJECT (stream, "No current segment, doing initial selection");
/* Initial choice */
stream->current_segment =
gst_hls_media_playlist_get_starting_segment (new_playlist);
GST_DEBUG_OBJECT (stream, "No current segment");
}
if (stream->playlist) {
gst_hls_media_playlist_unref (stream->playlist);
stream->playlist = new_playlist;
gst_hls_media_playlist_dump (new_playlist);
} else {
GST_DEBUG_OBJECT (stream, "Setting up initial playlist");
stream->playlist = new_playlist;
setup_initial_playlist_and_mapping (demux, new_playlist);
}
if (stream->playlist)
gst_hls_media_playlist_unref (stream->playlist);
stream->playlist = new_playlist;
gst_hls_media_playlist_dump (new_playlist);
if (stream->current_segment) {
GST_DEBUG_OBJECT (stream,
@ -2062,27 +2065,42 @@ gst_hls_demux_update_fragment_info (GstAdaptiveDemux2Stream * stream)
return GST_FLOW_ERROR;
}
if (hlsdemux_stream->pending_advance) {
GST_DEBUG_OBJECT (stream, "Applying pending advance_fragment");
gst_hls_demux_advance_fragment (stream);
/* If we are still waiting to advance, return EOS to trigger the appropriate
* playlist update (if live) or real EOS */
if (hlsdemux_stream->pending_advance)
return GST_FLOW_EOS;
}
GST_DEBUG_OBJECT (stream, "Updating fragment information");
GST_DEBUG_OBJECT (hlsdemux, "Updating for %s stream '%s'",
hlsdemux_stream->is_variant ? "MAIN" : "MEDIA",
hlsdemux_stream->is_variant ?
hlsdemux->current_variant->name : hlsdemux_stream->
current_rendition->name);
/* Find the current segment if we don't already have it */
if (hlsdemux_stream->current_segment == NULL) {
if (stream->current_position == GST_CLOCK_TIME_NONE) {
GST_DEBUG_OBJECT (stream, "Setting up initial segment");
hlsdemux_stream->current_segment =
gst_hls_media_playlist_get_starting_segment
(hlsdemux_stream->playlist);
setup_initial_playlist_and_mapping (hlsdemux, hlsdemux_stream->playlist);
} else {
GST_DEBUG_OBJECT (stream,
"Looking up segment for position %" GST_TIME_FORMAT,
GST_TIME_ARGS (stream->current_position));
hlsdemux_stream->current_segment =
gst_hls_media_playlist_seek (hlsdemux_stream->playlist, TRUE,
GST_SEEK_FLAG_SNAP_NEAREST, stream->current_position);
if (hlsdemux_stream->current_segment == NULL) {
GST_INFO_OBJECT (hlsdemux,
"This playlist doesn't contain more fragments");
return GST_FLOW_EOS;
}
/* Update time mapping. If it already exists it will be ignored */
gst_hls_demux_add_time_mapping (hlsdemux,
hlsdemux_stream->current_segment->discont_sequence,
hlsdemux_stream->current_segment->stream_time,
hlsdemux_stream->current_segment->datetime);
}
}
file = hlsdemux_stream->current_segment;
if (file == NULL) {
GST_INFO_OBJECT (hlsdemux, "This playlist doesn't contain more fragments");
return GST_FLOW_EOS;
}
GST_DEBUG_OBJECT (stream, "Current segment stream_time %" GST_STIME_FORMAT,
GST_STIME_ARGS (file->stream_time));
discont = file->discont || stream->discont;
@ -2302,18 +2320,6 @@ gst_hls_demux_update_playlist (GstHLSDemux * demux, gboolean update,
err))
return FALSE;
if (demux->main_stream->pending_advance) {
GST_DEBUG_OBJECT (demux, "Applying variant pending advance_fragment");
if (gst_hls_demux_advance_fragment ((GstAdaptiveDemux2Stream *)
demux->main_stream) != GST_FLOW_OK) {
/* We return now without updating variant streams for update since we
* couldn't advance. But we return TRUE since we *did* update the
* playlist */
GST_DEBUG_OBJECT (demux, "Couldn't apply pending advance yet");
return TRUE;
}
}
if (update && gst_hls_demux_is_live (adaptive_demux)) {
GList *tmp;
GST_DEBUG_OBJECT (demux,

3
subprojects/gst-plugins-good/ext/adaptivedemux2/hls/gsthlsdemux.h
View file

@ -113,9 +113,6 @@ struct _GstHLSDemuxStream
/* The segment (from the above playlist) currently being used */
GstM3U8MediaSegment *current_segment;
/* The previous ::advance_fragment() failed for live stream */
gboolean pending_advance;
/* Whether we need to typefind the next buffer */
gboolean do_typefind;