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videofilter: implement propose_allocation

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With the new video bufferpool we can now implement the propose_allocation
vmethod on some video filter elements so that we can also use video metadata and
bufferpools when not operating in passthrough mode.
This commit is contained in:
Wim Taymans 2011-12-21 18:58:42 +01:00
parent 13a579a03c
commit 8a9c4ed69f
3 changed files with 100 additions and 0 deletions
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48
gst/videoconvert/gstvideoconvert.c
View file

@ -159,6 +159,52 @@ gst_video_convert_transform_caps (GstBaseTransform * btrans,
return result;
}
/* Answer the allocation query downstream. This is only called for
* non-passthrough cases */
static gboolean
gst_video_convert_propose_allocation (GstBaseTransform * trans,
GstQuery * query)
{
GstVideoConvert *space = GST_VIDEO_CONVERT_CAST (trans);
GstBufferPool *pool;
GstCaps *caps;
gboolean need_pool;
guint size;
gst_query_parse_allocation (query, &caps, &need_pool);
size = GST_VIDEO_INFO_SIZE (&space->from_info);
if (need_pool) {
GstStructure *structure;
pool = gst_video_buffer_pool_new ();
structure = gst_buffer_pool_get_config (pool);
gst_buffer_pool_config_set (structure, caps, size, 0, 0, 0, 15);
if (!gst_buffer_pool_set_config (pool, structure))
goto config_failed;
} else
pool = NULL;
gst_query_set_allocation_params (query, size, 0, 0, 0, 15, pool);
gst_object_unref (pool);
gst_query_add_allocation_meta (query, GST_VIDEO_META_API);
return TRUE;
/* ERRORS */
config_failed:
{
GST_ERROR_OBJECT (space, "failed to set config.");
gst_object_unref (pool);
return FALSE;
}
}
/* configure the allocation query that was answered downstream, we can configure
* some properties on it. Only called in passthrough mode. */
static gboolean
gst_video_convert_decide_allocation (GstBaseTransform * trans, GstQuery * query)
{
@ -369,6 +415,8 @@ gst_video_convert_class_init (GstVideoConvertClass * klass)
GST_DEBUG_FUNCPTR (gst_video_convert_set_caps);
gstbasetransform_class->transform_size =
GST_DEBUG_FUNCPTR (gst_video_convert_transform_size);
gstbasetransform_class->propose_allocation =
GST_DEBUG_FUNCPTR (gst_video_convert_propose_allocation);
gstbasetransform_class->decide_allocation =
GST_DEBUG_FUNCPTR (gst_video_convert_decide_allocation);
gstbasetransform_class->transform =

50
gst/videoscale/gstvideoscale.c
View file

@ -190,6 +190,8 @@ static gboolean gst_video_scale_set_caps (GstBaseTransform * trans,
GstCaps * in, GstCaps * out);
static gboolean gst_video_scale_get_unit_size (GstBaseTransform * trans,
GstCaps * caps, gsize * size);
static gboolean gst_video_scale_propose_allocation (GstBaseTransform * trans,
GstQuery * query);
static gboolean gst_video_scale_decide_allocation (GstBaseTransform * trans,
GstQuery * query);
static GstFlowReturn gst_video_scale_transform (GstBaseTransform * trans,
@ -271,6 +273,8 @@ gst_video_scale_class_init (GstVideoScaleClass * klass)
trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_video_scale_set_caps);
trans_class->get_unit_size =
GST_DEBUG_FUNCPTR (gst_video_scale_get_unit_size);
trans_class->propose_allocation =
GST_DEBUG_FUNCPTR (gst_video_scale_propose_allocation);
trans_class->decide_allocation =
GST_DEBUG_FUNCPTR (gst_video_scale_decide_allocation);
trans_class->transform = GST_DEBUG_FUNCPTR (gst_video_scale_transform);
@ -446,7 +450,51 @@ gst_video_scale_transform_caps (GstBaseTransform * trans,
return ret;
}
/* Answer the allocation query downstream. This is only called for
* non-passthrough cases */
static gboolean
gst_video_scale_propose_allocation (GstBaseTransform * trans, GstQuery * query)
{
GstVideoScale *scale = GST_VIDEO_SCALE_CAST (trans);
GstBufferPool *pool;
GstCaps *caps;
gboolean need_pool;
guint size;
gst_query_parse_allocation (query, &caps, &need_pool);
size = GST_VIDEO_INFO_SIZE (&scale->from_info);
if (need_pool) {
GstStructure *structure;
pool = gst_video_buffer_pool_new ();
structure = gst_buffer_pool_get_config (pool);
gst_buffer_pool_config_set (structure, caps, size, 0, 0, 0, 15);
if (!gst_buffer_pool_set_config (pool, structure))
goto config_failed;
} else
pool = NULL;
gst_query_set_allocation_params (query, size, 0, 0, 0, 15, pool);
gst_object_unref (pool);
gst_query_add_allocation_meta (query, GST_VIDEO_META_API);
return TRUE;
/* ERRORS */
config_failed:
{
GST_ERROR_OBJECT (scale, "failed to set config.");
gst_object_unref (pool);
return FALSE;
}
}
/* configure the allocation query that was answered downstream, we can configure
* some properties on it. Only called in passthrough mode. */
static gboolean
gst_video_scale_decide_allocation (GstBaseTransform * trans, GstQuery * query)
{
@ -571,6 +619,8 @@ gst_video_scale_fixate_caps (GstBaseTransform * base, GstPadDirection direction,
g_return_if_fail (gst_caps_is_fixed (caps));
gst_caps_truncate (othercaps);
GST_DEBUG_OBJECT (base, "trying to fixate othercaps %" GST_PTR_FORMAT
" based on caps %" GST_PTR_FORMAT, othercaps, caps);

2
gst/videoscale/gstvideoscale.h
View file

@ -41,6 +41,8 @@ GST_DEBUG_CATEGORY_EXTERN (video_scale_debug);
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_VIDEO_SCALE))
#define GST_IS_VIDEO_SCALE_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_VIDEO_SCALE))
#define GST_VIDEO_SCALE_CAST(obj) ((GstVideoScale *)(obj))
/**
* GstVideoScaleMethod: