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From 39bb299bd638b78fdf8c4054bcc90f9f915d7ff8 Mon Sep 17 00:00:00 2001
From: Kazunori Kobayashi <kkobayas@igel.co.jp>
Date: Thu, 10 May 2012 10:46:20 +0900
Subject: [PATCH 06/31] videocrop: send a query whether the rowstride
capability is supported
This patch sends a query which asks downstream plugins whether
can handle the rowstride capability.
gst_video_crop_start() can be invoked when the pad is enabled.
The query is issued by gst_video_crop_start() once at initialization.
This patch is preliminary for the zero-copy cropping.
---
gst/videocrop/gstvideocrop.c | 38 ++++++++++++++++++++++++++++++++++++++
gst/videocrop/gstvideocrop.h | 4 ++++
2 files changed, 42 insertions(+)
diff --git a/gst/videocrop/gstvideocrop.c b/gst/videocrop/gstvideocrop.c
index 1f09f8d..b0c3a68 100644
--- a/gst/videocrop/gstvideocrop.c
+++ b/gst/videocrop/gstvideocrop.c
@@ -136,6 +136,7 @@ static gboolean gst_video_crop_set_caps (GstBaseTransform * trans,
GstCaps * in_caps, GstCaps * outcaps);
static gboolean gst_video_crop_src_event (GstBaseTransform * trans,
GstEvent * event);
+static gboolean gst_video_crop_start (GstBaseTransform * trans);
static void
gst_video_crop_base_init (gpointer g_class)
@@ -228,6 +229,7 @@ gst_video_crop_class_init (GstVideoCropClass * klass)
basetransform_class->set_caps = GST_DEBUG_FUNCPTR (gst_video_crop_set_caps);
basetransform_class->get_unit_size =
GST_DEBUG_FUNCPTR (gst_video_crop_get_unit_size);
+ basetransform_class->start = GST_DEBUG_FUNCPTR (gst_video_crop_start);
basetransform_class->passthrough_on_same_caps = FALSE;
basetransform_class->src_event = GST_DEBUG_FUNCPTR (gst_video_crop_src_event);
@@ -240,6 +242,10 @@ gst_video_crop_init (GstVideoCrop * vcrop, GstVideoCropClass * klass)
vcrop->crop_left = 0;
vcrop->crop_top = 0;
vcrop->crop_bottom = 0;
+
+ /* register query type for rowstride */
+ vcrop->query_type_stride = gst_query_type_register ("stride-supported",
+ "whether dealing with rowstride as a capability or not");
}
static gboolean
@@ -669,6 +675,38 @@ cropping_too_much:
}
}
+static gboolean
+gst_video_crop_query_stride_supported (GstVideoCrop * vcrop)
+{
+ gboolean result = FALSE;
+ GstPad *peer = gst_pad_get_peer (GST_BASE_TRANSFORM (vcrop)->srcpad);
+ GstStructure *structure;
+ GstQuery *query;
+
+ structure = gst_structure_empty_new ("GstQueryStrideSupported");
+ gst_structure_set (structure, "stride-supported", G_TYPE_BOOLEAN, FALSE,
+ NULL);
+
+ query = gst_query_new_application (vcrop->query_type_stride, structure);
+ if (gst_pad_query (peer, query))
+ gst_structure_get_boolean (structure, "stride-supported", &result);
+
+ gst_query_unref (query);
+ gst_object_unref (peer);
+
+ return result;
+}
+
+static gboolean
+gst_video_crop_start (GstBaseTransform * trans)
+{
+ GstVideoCrop *vcrop = GST_VIDEO_CROP (trans);
+
+ vcrop->stride_supported = gst_video_crop_query_stride_supported (vcrop);
+
+ return TRUE;
+}
+
static void
gst_video_crop_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
diff --git a/gst/videocrop/gstvideocrop.h b/gst/videocrop/gstvideocrop.h
index f05649d..5cfe03e 100644
--- a/gst/videocrop/gstvideocrop.h
+++ b/gst/videocrop/gstvideocrop.h
@@ -76,6 +76,10 @@ struct _GstVideoCrop
GstVideoCropImageDetails in; /* details of input image */
GstVideoCropImageDetails out; /* details of output image */
+
+ /* query for rowstride */
+ GstQueryType query_type_stride;
+ gboolean stride_supported;
};
struct _GstVideoCropClass
--
1.7.9.5
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