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v4l2: add ALLOCATION query to the sink

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This commit is contained in:
Wim Taymans 2011-07-15 11:30:25 +02:00
parent 21f532ae10
commit 549a4ddc8f
1 changed files with 76 additions and 1 deletions
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77
sys/v4l2/gstv4l2sink.c
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@ -53,6 +53,7 @@
#include <config.h>
#endif
#include "gst/video/gstmetavideo.h"
#include "gstv4l2colorbalance.h"
#include "gstv4l2tuner.h"
@ -133,11 +134,12 @@ static void gst_v4l2sink_set_property (GObject * object, guint prop_id,
static void gst_v4l2sink_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
/* GstElement methods: */
static GstStateChangeReturn gst_v4l2sink_change_state (GstElement * element,
GstStateChange transition);
static gboolean gst_v4l2sink_sink_query (GstPad * sinkpad, GstQuery * query);
/* GstBaseSink methods: */
static GstCaps *gst_v4l2sink_get_caps (GstBaseSink * bsink, GstCaps * filter);
static gboolean gst_v4l2sink_set_caps (GstBaseSink * bsink, GstCaps * caps);
@ -234,6 +236,10 @@ gst_v4l2sink_class_init (GstV4l2SinkClass * klass)
static void
gst_v4l2sink_init (GstV4l2Sink * v4l2sink)
{
/* for the ALLOCATION query */
gst_pad_set_query_function (GST_BASE_SINK (v4l2sink)->sinkpad,
gst_v4l2sink_sink_query);
v4l2sink->v4l2object = gst_v4l2_object_new (GST_ELEMENT (v4l2sink),
V4L2_BUF_TYPE_VIDEO_OUTPUT, DEFAULT_PROP_DEVICE,
gst_v4l2_get_output, gst_v4l2_set_output, NULL);
@ -662,6 +668,75 @@ invalid_format:
}
}
static gboolean
gst_v4l2sink_sink_query (GstPad * sinkpad, GstQuery * query)
{
GstV4l2Sink *v4l2sink = GST_V4L2SINK (GST_PAD_PARENT (sinkpad));
GstV4l2Object *obj = v4l2sink->v4l2object;
gboolean res = TRUE;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_ALLOCATION:
{
GstBufferPool *pool;
GstStructure *config;
GstCaps *caps;
guint size = 0;
gboolean need_pool;
gst_query_parse_allocation (query, &caps, &need_pool);
if (caps == NULL)
goto no_caps;
if ((pool = obj->pool))
gst_object_ref (pool);
if (pool != NULL) {
const GstCaps *pcaps;
/* we had a pool, check caps */
config = gst_buffer_pool_get_config (pool);
gst_buffer_pool_config_get (config, &pcaps, &size, NULL, NULL, NULL,
NULL);
GST_DEBUG_OBJECT (v4l2sink,
"we had a pool with caps %" GST_PTR_FORMAT, pcaps);
if (!gst_caps_is_equal (caps, pcaps)) {
gst_object_unref (pool);
goto different_caps;
}
}
gst_query_set_allocation_params (query, size, 0, 0, 0, 15, pool);
/* we also support various metadata */
gst_query_add_allocation_meta (query, GST_META_API_VIDEO);
gst_query_add_allocation_meta (query, GST_META_API_VIDEO_CROP);
if (pool)
gst_object_unref (pool);
break;
}
default:
res = FALSE;
break;
}
return res;
/* ERRORS */
no_caps:
{
GST_DEBUG_OBJECT (sinkpad, "no caps specified");
return FALSE;
}
different_caps:
{
/* different caps, we can't use this pool */
GST_DEBUG_OBJECT (v4l2sink, "pool has different caps");
return FALSE;
}
}
/* called after A/V sync to render frame */
static GstFlowReturn
gst_v4l2sink_show_frame (GstBaseSink * bsink, GstBuffer * buf)