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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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adaptivedemux: Preroll streams before exposing them
To ensure that pads have caps when they are exposed, do the exposing when all pending streams have prerolled an output buffer, and only then EOS and remove any old pads. Improves the switching sequence by making caps available as soon as a pad appears. With fixes from Seungha Yang <sh.yang@lge.com> https://bugzilla.gnome.org/show_bug.cgi?id=758257
This commit is contained in:
Jan Schmidt
parent
9b778f7264
commit
b2113f69c6
2 changed files with 180 additions and 31 deletions
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@ -198,6 +198,11 @@ struct _GstAdaptiveDemuxPrivate
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GCond manifest_cond;
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GMutex manifest_update_lock;
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/* Lock and condition for prerolling streams before exposing */
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GMutex preroll_lock;
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GCond preroll_cond;
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gint preroll_pending;
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GMutex api_lock;
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/* Protects demux and stream segment information
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@ -242,8 +247,9 @@ static void gst_adaptive_demux_updates_loop (GstAdaptiveDemux * demux);
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static void gst_adaptive_demux_stream_download_loop (GstAdaptiveDemuxStream *
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stream);
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static void gst_adaptive_demux_reset (GstAdaptiveDemux * demux);
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static gboolean gst_adaptive_demux_expose_streams (GstAdaptiveDemux * demux,
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static gboolean gst_adaptive_demux_prepare_streams (GstAdaptiveDemux * demux,
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gboolean first_and_live);
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static gboolean gst_adaptive_demux_expose_streams (GstAdaptiveDemux * demux);
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static gboolean gst_adaptive_demux_is_live (GstAdaptiveDemux * demux);
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static GstFlowReturn gst_adaptive_demux_stream_seek (GstAdaptiveDemux * demux,
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GstAdaptiveDemuxStream * stream, gboolean forward, GstSeekFlags flags,
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@ -270,7 +276,8 @@ static GstFlowReturn
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gst_adaptive_demux_stream_push_event (GstAdaptiveDemuxStream * stream,
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GstEvent * event);
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static void gst_adaptive_demux_start_tasks (GstAdaptiveDemux * demux);
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static void gst_adaptive_demux_start_tasks (GstAdaptiveDemux * demux,
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gboolean start_preroll_streams);
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static void gst_adaptive_demux_stop_tasks (GstAdaptiveDemux * demux);
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static GstFlowReturn gst_adaptive_demux_combine_flows (GstAdaptiveDemux *
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demux);
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@ -483,6 +490,9 @@ gst_adaptive_demux_init (GstAdaptiveDemux * demux,
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g_mutex_init (&demux->priv->api_lock);
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g_mutex_init (&demux->priv->segment_lock);
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g_cond_init (&demux->priv->preroll_cond);
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g_mutex_init (&demux->priv->preroll_lock);
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pad_template =
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gst_element_class_get_pad_template (GST_ELEMENT_CLASS (klass), "sink");
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g_return_if_fail (pad_template != NULL);
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@ -525,6 +535,9 @@ gst_adaptive_demux_finalize (GObject * object)
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demux->realtime_clock = NULL;
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}
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g_cond_clear (&demux->priv->preroll_cond);
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g_mutex_clear (&demux->priv->preroll_lock);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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@ -684,9 +697,9 @@ gst_adaptive_demux_sink_event (GstPad * pad, GstObject * parent,
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}
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if (demux->next_streams) {
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gst_adaptive_demux_expose_streams (demux,
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gst_adaptive_demux_prepare_streams (demux,
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gst_adaptive_demux_is_live (demux));
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gst_adaptive_demux_start_tasks (demux);
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gst_adaptive_demux_start_tasks (demux, TRUE);
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if (gst_adaptive_demux_is_live (demux)) {
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g_mutex_lock (&demux->priv->updates_timed_lock);
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demux->priv->stop_updates_task = FALSE;
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@ -775,6 +788,16 @@ gst_adaptive_demux_reset (GstAdaptiveDemux * demux)
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gst_event_unref (eos);
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g_list_free (demux->streams);
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demux->streams = NULL;
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if (demux->prepared_streams) {
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g_list_free_full (demux->prepared_streams,
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(GDestroyNotify) gst_adaptive_demux_stream_free);
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demux->prepared_streams = NULL;
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}
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if (demux->next_streams) {
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g_list_free_full (demux->next_streams,
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(GDestroyNotify) gst_adaptive_demux_stream_free);
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demux->next_streams = NULL;
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}
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if (old_streams) {
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g_list_free_full (old_streams,
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@ -872,10 +895,9 @@ gst_adaptive_demux_set_stream_struct_size (GstAdaptiveDemux * demux,
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/* must be called with manifest_lock taken */
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static gboolean
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gst_adaptive_demux_expose_stream (GstAdaptiveDemux * demux,
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gst_adaptive_demux_prepare_stream (GstAdaptiveDemux * demux,
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GstAdaptiveDemuxStream * stream)
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{
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gboolean ret;
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GstPad *pad = stream->pad;
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gchar *name = gst_pad_get_name (pad);
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GstEvent *event;
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@ -907,16 +929,33 @@ gst_adaptive_demux_expose_stream (GstAdaptiveDemux * demux,
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g_free (stream_id);
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g_free (name);
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GST_DEBUG_OBJECT (demux, "Adding srcpad %s:%s with caps %" GST_PTR_FORMAT,
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GST_DEBUG_PAD_NAME (pad), stream->pending_caps);
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GST_DEBUG_OBJECT (demux, "Preparing srcpad %s:%s", GST_DEBUG_PAD_NAME (pad));
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stream->discont = TRUE;
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return TRUE;
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}
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static gboolean
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gst_adaptive_demux_expose_stream (GstAdaptiveDemux * demux,
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GstAdaptiveDemuxStream * stream)
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{
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gboolean ret;
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GstPad *pad = stream->pad;
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GstCaps *caps;
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if (stream->pending_caps) {
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gst_pad_set_caps (pad, stream->pending_caps);
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gst_caps_unref (stream->pending_caps);
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caps = stream->pending_caps;
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stream->pending_caps = NULL;
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} else {
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caps = gst_pad_get_current_caps (pad);
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}
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stream->discont = TRUE;
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GST_DEBUG_OBJECT (demux, "Exposing srcpad %s:%s with caps %" GST_PTR_FORMAT,
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GST_DEBUG_PAD_NAME (pad), caps);
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if (caps)
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gst_caps_unref (caps);
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gst_object_ref (pad);
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@ -959,17 +998,21 @@ gst_adaptive_demux_get_period_start_time (GstAdaptiveDemux * demux)
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/* must be called with manifest_lock taken */
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static gboolean
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gst_adaptive_demux_expose_streams (GstAdaptiveDemux * demux,
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gst_adaptive_demux_prepare_streams (GstAdaptiveDemux * demux,
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gboolean first_and_live)
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{
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GList *iter;
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GList *old_streams;
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GstClockTime period_start, min_pts = GST_CLOCK_TIME_NONE;
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g_return_val_if_fail (demux->next_streams != NULL, FALSE);
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if (demux->prepared_streams != NULL) {
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/* Old streams that were never exposed, due to a seek or so */
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GST_FIXME_OBJECT (demux,
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"Preparing new streams without cleaning up old ones!");
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return FALSE;
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}
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old_streams = demux->streams;
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demux->streams = demux->next_streams;
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demux->prepared_streams = demux->next_streams;
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demux->next_streams = NULL;
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if (!demux->running) {
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@ -977,10 +1020,12 @@ gst_adaptive_demux_expose_streams (GstAdaptiveDemux * demux,
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return TRUE;
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}
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for (iter = demux->streams; iter; iter = g_list_next (iter)) {
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for (iter = demux->prepared_streams; iter; iter = g_list_next (iter)) {
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GstAdaptiveDemuxStream *stream = iter->data;
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if (!gst_adaptive_demux_expose_stream (demux,
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stream->do_block = TRUE;
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if (!gst_adaptive_demux_prepare_stream (demux,
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GST_ADAPTIVE_DEMUX_STREAM_CAST (stream))) {
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/* TODO act on error */
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}
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@ -1011,7 +1056,7 @@ gst_adaptive_demux_expose_streams (GstAdaptiveDemux * demux,
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GST_SEEK_TYPE_NONE, -1, NULL);
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}
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for (iter = demux->streams; iter; iter = g_list_next (iter)) {
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for (iter = demux->prepared_streams; iter; iter = g_list_next (iter)) {
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GstAdaptiveDemuxStream *stream = iter->data;
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GstClockTime offset;
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@ -1091,8 +1136,36 @@ gst_adaptive_demux_expose_streams (GstAdaptiveDemux * demux,
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stream->pending_segment = gst_event_new_segment (&stream->segment);
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gst_event_set_seqnum (stream->pending_segment, demux->priv->segment_seqnum);
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GST_DEBUG ("Prepared segment %" GST_SEGMENT_FORMAT " for stream %p",
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&stream->segment, stream);
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}
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return TRUE;
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}
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static gboolean
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gst_adaptive_demux_expose_streams (GstAdaptiveDemux * demux)
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{
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GList *iter;
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GList *old_streams;
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g_return_val_if_fail (demux->prepared_streams != NULL, FALSE);
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old_streams = demux->streams;
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demux->streams = demux->prepared_streams;
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demux->prepared_streams = NULL;
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for (iter = demux->streams; iter; iter = g_list_next (iter)) {
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GstAdaptiveDemuxStream *stream = iter->data;
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if (!gst_adaptive_demux_expose_stream (demux,
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GST_ADAPTIVE_DEMUX_STREAM_CAST (stream))) {
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/* TODO act on error */
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}
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}
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demux->priv->preroll_pending = 0;
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GST_MANIFEST_UNLOCK (demux);
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gst_element_no_more_pads (GST_ELEMENT_CAST (demux));
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GST_MANIFEST_LOCK (demux);
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@ -1142,6 +1215,14 @@ gst_adaptive_demux_expose_streams (GstAdaptiveDemux * demux,
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g_list_concat (demux->priv->old_streams, old_streams);
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}
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/* Unblock after removing oldstreams */
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for (iter = demux->streams; iter; iter = g_list_next (iter)) {
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GstAdaptiveDemuxStream *stream = iter->data;
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stream->do_block = FALSE;
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}
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GST_DEBUG_OBJECT (demux, "All streams are exposed");
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return TRUE;
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}
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@ -1166,6 +1247,11 @@ gst_adaptive_demux_stream_new (GstAdaptiveDemux * demux, GstPad * pad)
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g_malloc0 (sizeof (guint64) * NUM_LOOKBACK_FRAGMENTS);
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gst_pad_set_element_private (pad, stream);
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g_mutex_lock (&demux->priv->preroll_lock);
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stream->do_block = TRUE;
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demux->priv->preroll_pending++;
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g_mutex_unlock (&demux->priv->preroll_lock);
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gst_pad_set_query_function (pad,
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GST_DEBUG_FUNCPTR (gst_adaptive_demux_src_query));
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gst_pad_set_event_function (pad,
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@ -1509,7 +1595,10 @@ gst_adaptive_demux_handle_seek_event (GstAdaptiveDemux * demux, GstPad * pad,
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}
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if (demux->next_streams) {
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gst_adaptive_demux_expose_streams (demux, FALSE);
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/* If the seek generated new streams, get them
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* to preroll */
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gst_adaptive_demux_prepare_streams (demux, FALSE);
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gst_adaptive_demux_start_tasks (demux, TRUE);
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} else {
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GList *iter;
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GstClockTime period_start =
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@ -1540,10 +1629,11 @@ gst_adaptive_demux_handle_seek_event (GstAdaptiveDemux * demux, GstPad * pad,
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}
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GST_ADAPTIVE_DEMUX_SEGMENT_UNLOCK (demux);
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/* Restart the demux */
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gst_adaptive_demux_start_tasks (demux, FALSE);
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}
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/* Restart the demux */
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gst_adaptive_demux_start_tasks (demux);
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if (gst_adaptive_demux_is_live (demux)) {
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g_mutex_lock (&demux->priv->updates_timed_lock);
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demux->priv->stop_updates_task = FALSE;
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@ -1730,7 +1820,8 @@ gst_adaptive_demux_src_query (GstPad * pad, GstObject * parent,
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/* must be called with manifest_lock taken */
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static void
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gst_adaptive_demux_start_tasks (GstAdaptiveDemux * demux)
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gst_adaptive_demux_start_tasks (GstAdaptiveDemux * demux,
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gboolean start_preroll_streams)
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{
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GList *iter;
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@ -1740,12 +1831,17 @@ gst_adaptive_demux_start_tasks (GstAdaptiveDemux * demux)
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}
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GST_INFO_OBJECT (demux, "Starting streams' tasks");
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for (iter = demux->streams; iter; iter = g_list_next (iter)) {
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iter = start_preroll_streams ? demux->prepared_streams : demux->streams;
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for (; iter; iter = g_list_next (iter)) {
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GstAdaptiveDemuxStream *stream = iter->data;
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g_mutex_lock (&stream->fragment_download_lock);
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stream->cancelled = FALSE;
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g_mutex_unlock (&stream->fragment_download_lock);
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if (!start_preroll_streams) {
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g_mutex_lock (&stream->fragment_download_lock);
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stream->cancelled = FALSE;
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g_mutex_unlock (&stream->fragment_download_lock);
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}
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stream->last_ret = GST_FLOW_OK;
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gst_task_start (stream->download_task);
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@ -1770,8 +1866,6 @@ gst_adaptive_demux_stop_tasks (GstAdaptiveDemux * demux)
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g_cond_signal (&demux->priv->updates_timed_cond);
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g_mutex_unlock (&demux->priv->updates_timed_lock);
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gst_uri_downloader_cancel (demux->downloader);
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GST_LOG_OBJECT (demux, "Stopping tasks");
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for (iter = demux->streams; iter; iter = g_list_next (iter)) {
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@ -1784,6 +1878,12 @@ gst_adaptive_demux_stop_tasks (GstAdaptiveDemux * demux)
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g_mutex_unlock (&stream->fragment_download_lock);
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}
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g_mutex_lock (&demux->priv->preroll_lock);
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g_cond_broadcast (&demux->priv->preroll_cond);
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g_mutex_unlock (&demux->priv->preroll_lock);
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gst_uri_downloader_cancel (demux->downloader);
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g_mutex_lock (&demux->priv->manifest_update_lock);
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g_cond_broadcast (&demux->priv->manifest_cond);
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g_mutex_unlock (&demux->priv->manifest_update_lock);
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@ -1973,6 +2073,21 @@ gst_adaptive_demux_combine_flows (GstAdaptiveDemux * demux)
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return GST_FLOW_OK;
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}
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/* Called with preroll_lock */
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static void
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gst_adaptive_demux_handle_preroll (GstAdaptiveDemux * demux,
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GstAdaptiveDemuxStream * stream)
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{
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demux->priv->preroll_pending--;
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if (demux->priv->preroll_pending == 0) {
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/* That was the last one, time to release all streams
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* and expose them */
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GST_DEBUG_OBJECT (demux, "All streams prerolled. exposing");
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gst_adaptive_demux_expose_streams (demux);
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g_cond_broadcast (&demux->priv->preroll_cond);
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}
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}
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/* must be called with manifest_lock taken.
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* Temporarily releases manifest_lock
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*/
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@ -2043,6 +2158,35 @@ gst_adaptive_demux_stream_push_buffer (GstAdaptiveDemuxStream * stream,
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gst_caps_unref (stream->pending_caps);
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stream->pending_caps = NULL;
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}
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if (stream->do_block) {
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g_mutex_lock (&demux->priv->preroll_lock);
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/* If we are preroll state, set caps in here */
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if (pending_caps) {
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gst_pad_push_event (stream->pad, pending_caps);
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pending_caps = NULL;
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}
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gst_adaptive_demux_handle_preroll (demux, stream);
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GST_MANIFEST_UNLOCK (demux);
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while (stream->do_block && !stream->cancelled) {
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GST_LOG_OBJECT (demux, "Stream %p sleeping for preroll", stream);
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g_cond_wait (&demux->priv->preroll_cond, &demux->priv->preroll_lock);
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}
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if (stream->cancelled) {
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GST_LOG_OBJECT (demux, "stream %p cancelled", stream);
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gst_buffer_unref (buffer);
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g_mutex_unlock (&demux->priv->preroll_lock);
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return GST_FLOW_FLUSHING;
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}
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g_mutex_unlock (&demux->priv->preroll_lock);
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GST_MANIFEST_LOCK (demux);
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}
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if (G_UNLIKELY (stream->pending_segment)) {
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GST_ADAPTIVE_DEMUX_SEGMENT_LOCK (demux);
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pending_segment = stream->pending_segment;
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@ -2098,6 +2242,8 @@ gst_adaptive_demux_stream_push_buffer (GstAdaptiveDemuxStream * stream,
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pending_events = g_list_delete_link (pending_events, pending_events);
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}
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/* Wait for preroll if blocking */
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ret = gst_pad_push (stream->pad, buffer);
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GST_MANIFEST_LOCK (demux);
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@ -3786,8 +3932,8 @@ gst_adaptive_demux_stream_advance_fragment_unlocked (GstAdaptiveDemux * demux,
|
|||
if (can_expose) {
|
||||
GST_DEBUG_OBJECT (demux, "Subclass wants new pads "
|
||||
"to do bitrate switching");
|
||||
gst_adaptive_demux_expose_streams (demux, FALSE);
|
||||
gst_adaptive_demux_start_tasks (demux);
|
||||
gst_adaptive_demux_prepare_streams (demux, FALSE);
|
||||
gst_adaptive_demux_start_tasks (demux, TRUE);
|
||||
} else {
|
||||
GST_LOG_OBJECT (demux, "Not switching yet - ongoing downloads");
|
||||
}
|
||||
|
|
@ -3946,8 +4092,8 @@ gst_adaptive_demux_advance_period (GstAdaptiveDemux * demux)
|
|||
|
||||
GST_DEBUG_OBJECT (demux, "Advancing to next period");
|
||||
klass->advance_period (demux);
|
||||
gst_adaptive_demux_expose_streams (demux, FALSE);
|
||||
gst_adaptive_demux_start_tasks (demux);
|
||||
gst_adaptive_demux_prepare_streams (demux, FALSE);
|
||||
gst_adaptive_demux_start_tasks (demux, TRUE);
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
|
|||
|
|
@ -185,6 +185,8 @@ struct _GstAdaptiveDemuxStream
|
|||
|
||||
/* TODO check if used */
|
||||
gboolean eos;
|
||||
|
||||
gboolean do_block; /* TRUE if stream should block on preroll */
|
||||
};
|
||||
|
||||
/**
|
||||
|
|
@ -207,6 +209,7 @@ struct _GstAdaptiveDemux
|
|||
GstUriDownloader *downloader;
|
||||
|
||||
GList *streams;
|
||||
GList *prepared_streams;
|
||||
GList *next_streams;
|
||||
|
||||
GstSegment segment;
|
||||
|
|
|
|||
Loading…
Reference in a new issue