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pad: Implement more useful default handling for the LATENCY query

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Before we just took the values from the first pad that succeded the query,
now we accumulate the results of every sinkpad properly and return that
result.
This commit is contained in:
Sebastian Dröge 2015-02-12 13:55:36 +02:00
parent fd3a064c97
commit 1937d09a95
1 changed files with 105 additions and 1 deletions
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106
gst/gstpad.c
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@ -3050,6 +3050,107 @@ done:
return TRUE;
}
/* Default latency implementation */
typedef struct
{
gboolean live;
GstClockTime min, max;
} LatencyFoldData;
static gboolean
query_latency_default_fold (const GValue * item, GValue * ret,
gpointer user_data)
{
GstPad *pad = g_value_get_object (item);
LatencyFoldData *fold_data = user_data;
GstQuery *query;
gboolean res;
query = gst_query_new_latency ();
res = gst_pad_peer_query (pad, query);
if (res) {
gboolean live;
GstClockTime min, max;
gst_query_parse_latency (query, &live, &min, &max);
GST_LOG_OBJECT (pad, "got latency live:%s min:%" G_GINT64_FORMAT
" max:%" G_GINT64_FORMAT, live ? "true" : "false", min, max);
if (live) {
if (min > fold_data->min)
fold_data->min = min;
if (fold_data->max == GST_CLOCK_TIME_NONE)
fold_data->max = max;
else if (max < fold_data->max)
fold_data->max = max;
fold_data->live = TRUE;
}
g_value_set_boolean (ret, TRUE);
}
gst_query_unref (query);
return TRUE;
}
static gboolean
gst_pad_query_latency_default (GstPad * pad, GstQuery * query)
{
GstIterator *it;
GstIteratorResult res;
GValue ret = G_VALUE_INIT;
gboolean query_ret;
LatencyFoldData fold_data;
it = gst_pad_iterate_internal_links (pad);
retry:
fold_data.live = FALSE;
fold_data.min = 0;
fold_data.max = GST_CLOCK_TIME_NONE;
g_value_init (&ret, G_TYPE_BOOLEAN);
g_value_set_boolean (&ret, FALSE);
res = gst_iterator_fold (it, query_latency_default_fold, &ret, &fold_data);
switch (res) {
case GST_ITERATOR_OK:
g_assert_not_reached ();
break;
case GST_ITERATOR_DONE:
break;
case GST_ITERATOR_ERROR:
g_value_set_boolean (&ret, FALSE);
break;
case GST_ITERATOR_RESYNC:
gst_iterator_resync (it);
goto retry;
default:
g_assert_not_reached ();
break;
}
gst_iterator_free (it);
query_ret = g_value_get_boolean (&ret);
if (query_ret) {
GST_LOG_OBJECT (pad, "got latency live:%s min:%" G_GINT64_FORMAT
" max:%" G_GINT64_FORMAT, fold_data.live ? "true" : "false",
fold_data.min, fold_data.max);
if (fold_data.min > fold_data.max) {
GST_ERROR_OBJECT (pad, "minimum latency bigger than maximum latency");
}
gst_query_set_latency (query, fold_data.live, fold_data.min, fold_data.max);
} else {
GST_LOG_OBJECT (pad, "latency query failed");
}
return query_ret;
}
typedef struct
{
GstQuery *query;
@ -3105,10 +3206,13 @@ gst_pad_query_default (GstPad * pad, GstObject * parent, GstQuery * query)
ret = gst_pad_query_caps_default (pad, query);
forward = FALSE;
break;
case GST_QUERY_LATENCY:
ret = gst_pad_query_latency_default (pad, query);
forward = FALSE;
break;
case GST_QUERY_POSITION:
case GST_QUERY_SEEKING:
case GST_QUERY_FORMATS:
case GST_QUERY_LATENCY:
case GST_QUERY_JITTER:
case GST_QUERY_RATE:
case GST_QUERY_CONVERT: