Commit cc470dfb authored by Wim Taymans's avatar Wim Taymans
Browse files

libvisual: add latency query

Add our own latency to the latency query reply from upstream.
parent 0e395146
......@@ -136,6 +136,8 @@ static GstFlowReturn gst_visual_chain (GstPad * pad, GstBuffer * buffer);
static gboolean gst_visual_sink_event (GstPad * pad, GstEvent * event);
static gboolean gst_visual_src_event (GstPad * pad, GstEvent * event);
static gboolean gst_visual_src_query (GstPad * pad, GstQuery * query);
static gboolean gst_visual_sink_setcaps (GstPad * pad, GstCaps * caps);
static gboolean gst_visual_src_setcaps (GstPad * pad, GstCaps * caps);
static GstCaps *gst_visual_getcaps (GstPad * pad);
......@@ -220,6 +222,7 @@ gst_visual_init (GstVisual * visual)
gst_pad_set_setcaps_function (visual->srcpad, gst_visual_src_setcaps);
gst_pad_set_getcaps_function (visual->srcpad, gst_visual_getcaps);
gst_pad_set_event_function (visual->srcpad, gst_visual_src_event);
gst_pad_set_query_function (visual->srcpad, gst_visual_src_query);
gst_element_add_pad (GST_ELEMENT (visual), visual->srcpad);
visual->adapter = gst_adapter_new ();
......@@ -522,6 +525,63 @@ gst_visual_src_event (GstPad * pad, GstEvent * event)
return res;
}
static gboolean
gst_visual_src_query (GstPad * pad, GstQuery * query)
{
gboolean res;
GstVisual *visual;
visual = GST_VISUAL (gst_pad_get_parent (pad));
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_LATENCY:
{
/* We need to send the query upstream and add the returned latency to our
* own */
GstClockTime min_latency, max_latency;
gboolean us_live;
GstClockTime our_latency;
guint max_samples;
if ((res = gst_pad_peer_query (visual->sinkpad, query))) {
gst_query_parse_latency (query, &us_live, &min_latency, &max_latency);
GST_DEBUG_OBJECT (visual, "Peer latency: min %"
GST_TIME_FORMAT " max %" GST_TIME_FORMAT,
GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
/* the max samples we must buffer buffer */
max_samples = MAX (VISUAL_SAMPLES, visual->spf);
our_latency =
gst_util_uint64_scale_int (max_samples, GST_SECOND, visual->rate);
GST_DEBUG_OBJECT (visual, "Our latency: %" GST_TIME_FORMAT,
GST_TIME_ARGS (our_latency));
/* we add some latency but only if we need to buffer more than what
* upstream gives us */
min_latency += our_latency;
if (max_latency != -1)
max_latency += our_latency;
GST_DEBUG_OBJECT (visual, "Calculated total latency : min %"
GST_TIME_FORMAT " max %" GST_TIME_FORMAT,
GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
gst_query_set_latency (query, TRUE, min_latency, max_latency);
}
break;
}
default:
res = gst_pad_peer_query (visual->sinkpad, query);
break;
}
gst_object_unref (visual);
return res;
}
/* allocate and output buffer, if no format was negotiated, this
* function will negotiate one. After calling this function, a
* reverse negotiation could have happened. */
......
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