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basesrc: add alloc vmethod

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Make an alloc vmethod so that subclasses can override or call the default
implementation when they want.
This commit is contained in:
Wim Taymans 2011-08-04 18:00:02 +02:00
parent 6e5b113fbd
commit 10485ea803
2 changed files with 13 additions and 4 deletions
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11
libs/gst/base/gstbasesrc.c
View file

@ -305,6 +305,8 @@ static gboolean gst_base_src_default_prepare_seek_segment (GstBaseSrc * src,
GstEvent * event, GstSegment * segment);
static GstFlowReturn gst_base_src_default_create (GstBaseSrc * basesrc,
guint64 offset, guint size, GstBuffer ** buf);
static GstFlowReturn gst_base_src_default_alloc (GstBaseSrc * basesrc,
guint64 offset, guint size, GstBuffer ** buf);
static gboolean gst_base_src_set_flushing (GstBaseSrc * basesrc,
gboolean flushing, gboolean live_play, gboolean unlock, gboolean * playing);
@ -374,6 +376,7 @@ gst_base_src_class_init (GstBaseSrcClass * klass)
klass->prepare_seek_segment =
GST_DEBUG_FUNCPTR (gst_base_src_default_prepare_seek_segment);
klass->create = GST_DEBUG_FUNCPTR (gst_base_src_default_create);
klass->alloc = GST_DEBUG_FUNCPTR (gst_base_src_default_alloc);
/* Registering debug symbols for function pointers */
GST_DEBUG_REGISTER_FUNCPTR (gst_base_src_activate_push);
@ -1264,7 +1267,7 @@ gst_base_src_prepare_seek_segment (GstBaseSrc * src, GstEvent * event,
}
static GstFlowReturn
gst_base_src_alloc_buffer (GstBaseSrc * src, guint64 offset,
gst_base_src_default_alloc (GstBaseSrc * src, guint64 offset,
guint size, GstBuffer ** buffer)
{
GstFlowReturn ret;
@ -1298,10 +1301,12 @@ gst_base_src_default_create (GstBaseSrc * src, guint64 offset,
bclass = GST_BASE_SRC_GET_CLASS (src);
if (G_UNLIKELY (!bclass->alloc))
goto no_function;
if (G_UNLIKELY (!bclass->fill))
goto no_function;
ret = gst_base_src_alloc_buffer (src, offset, size, buffer);
ret = bclass->alloc (src, offset, size, buffer);
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto alloc_failed;
@ -1317,7 +1322,7 @@ gst_base_src_default_create (GstBaseSrc * src, guint64 offset,
/* ERRORS */
no_function:
{
GST_DEBUG_OBJECT (src, "no fill function");
GST_DEBUG_OBJECT (src, "no fill or alloc function");
return GST_FLOW_NOT_SUPPORTED;
}
alloc_failed:

6
libs/gst/base/gstbasesrc.h
View file

@ -205,9 +205,13 @@ struct _GstBaseSrcClass {
gboolean (*event) (GstBaseSrc *src, GstEvent *event);
/* ask the subclass to create a buffer with offset and size, the default
* implementation will use the negotiated allocator and call fill. */
* implementation will call alloc and fill. */
GstFlowReturn (*create) (GstBaseSrc *src, guint64 offset, guint size,
GstBuffer **buf);
/* ask the subclass to allocate an output buffer. The default implementation
* will use the negotiated allocator. */
GstFlowReturn (*alloc) (GstBaseSrc *src, guint64 offset, guint size,
GstBuffer **buf);
/* ask the subclass to fill the buffer with data from offset and size */
GstFlowReturn (*fill) (GstBaseSrc *src, guint64 offset, guint size,
GstBuffer *buf);