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collectpads: add ability to install clipping functions

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Add a method to install a clipping function that is called when a buffer is
received. Users of collectpads can then perform clipping on the incomming
buffers.

Also retab the header file a little.

See #590265
This commit is contained in:
Wim Taymans 2009-12-24 15:25:14 +01:00 committed by Wim Taymans
parent bdaadd4352
commit 4718b7ef09
4 changed files with 133 additions and 40 deletions
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3
docs/libs/gstreamer-libs-sections.txt
View file

@ -607,9 +607,11 @@ GST_BYTE_WRITER
GstCollectData
GstCollectPads
GstCollectPadsFunction
GstCollectPadsClipFunction
GstCollectDataDestroyNotify
gst_collect_pads_new
gst_collect_pads_set_function
gst_collect_pads_set_clip_function
gst_collect_pads_add_pad
gst_collect_pads_add_pad_full
gst_collect_pads_remove_pad
@ -628,6 +630,7 @@ gst_collect_pads_take_buffer
gst_collect_pads_flush
<SUBSECTION Standard>
GstCollectPadsClass
GstCollectPadsPrivate
GST_COLLECT_PADS
GST_IS_COLLECT_PADS
GST_TYPE_COLLECT_PADS

60
libs/gst/base/gstcollectpads.c
View file

@ -77,6 +77,15 @@
GST_DEBUG_CATEGORY_STATIC (collect_pads_debug);
#define GST_CAT_DEFAULT collect_pads_debug
#define GST_COLLECT_PADS_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_COLLECT_PADS, GstCollectPadsPrivate))
struct _GstCollectPadsPrivate
{
GstCollectPadsClipFunction clipfunc;
gpointer clipfunc_user_data;
};
GST_BOILERPLATE (GstCollectPads, gst_collect_pads, GstObject, GST_TYPE_OBJECT);
static void gst_collect_pads_clear (GstCollectPads * pads,
@ -101,6 +110,8 @@ gst_collect_pads_class_init (GstCollectPadsClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
g_type_class_add_private (klass, sizeof (GstCollectPadsPrivate));
GST_DEBUG_CATEGORY_INIT (collect_pads_debug, "collectpads", 0,
"GstCollectPads");
@ -110,6 +121,8 @@ gst_collect_pads_class_init (GstCollectPadsClass * klass)
static void
gst_collect_pads_init (GstCollectPads * pads, GstCollectPadsClass * g_class)
{
pads->abidata.ABI.priv = GST_COLLECT_PADS_GET_PRIVATE (pads);
pads->cond = g_cond_new ();
pads->data = NULL;
pads->cookie = 0;
@ -238,6 +251,10 @@ unref_data (GstCollectData * data)
* gst_collect_pads_remove_pad() to remove the pad from the collection
* again.
*
* This function will override the chain and event functions of the pad
* along with the element_private data, which is used to store private
* information for the collectpads.
*
* You specify a size for the returned #GstCollectData structure
* so that you can use it to store additional information.
*
@ -343,6 +360,32 @@ find_pad (GstCollectData * data, GstPad * pad)
return 1;
}
/**
* gst_collect_pads_set_clip_function:
* @pads: the collectspads to use
* @clipfunc: clip function to install
* @user_data: user data to pass to @clip_func
*
* Install a clipping function that is called right after a buffer is received
* on a pad managed by @pads. See #GstCollectDataClipFunction for more info.
*
* Since: 0.10.26
*/
void
gst_collect_pads_set_clip_function (GstCollectPads * pads,
GstCollectPadsClipFunction clipfunc, gpointer user_data)
{
GstCollectPadsPrivate *priv;
g_return_if_fail (pads != NULL);
g_return_if_fail (GST_IS_COLLECT_PADS (pads));
priv = pads->abidata.ABI.priv;
priv->clipfunc = clipfunc;
priv->clipfunc_user_data = user_data;
}
/**
* gst_collect_pads_remove_pad:
* @pads: the collectspads to use
@ -1257,6 +1300,7 @@ gst_collect_pads_chain (GstPad * pad, GstBuffer * buffer)
{
GstCollectData *data;
GstCollectPads *pads;
GstCollectPadsPrivate *priv;
GstFlowReturn ret;
GstBuffer **buffer_p;
@ -1271,6 +1315,7 @@ gst_collect_pads_chain (GstPad * pad, GstBuffer * buffer)
GST_OBJECT_UNLOCK (pad);
pads = data->collect;
priv = pads->abidata.ABI.priv;
GST_OBJECT_LOCK (pads);
/* if not started, bail out */
@ -1283,6 +1328,14 @@ gst_collect_pads_chain (GstPad * pad, GstBuffer * buffer)
if (G_UNLIKELY (data->abidata.ABI.eos))
goto unexpected;
/* see if we need to clip */
if (priv->clipfunc) {
buffer = priv->clipfunc (pads, data, buffer, priv->clipfunc_user_data);
if (G_UNLIKELY (buffer == NULL))
goto clipped;
}
GST_DEBUG ("Queuing buffer %p for pad %s:%s", buffer,
GST_DEBUG_PAD_NAME (pad));
@ -1387,6 +1440,13 @@ unexpected:
ret = GST_FLOW_UNEXPECTED;
goto unlock_done;
}
clipped:
{
GST_DEBUG ("clipped buffer on pad %s:%s", GST_DEBUG_PAD_NAME (pad));
GST_OBJECT_UNLOCK (pads);
unref_data (data);
return GST_FLOW_OK;
}
error:
{
/* we print the error, the element should post a reasonable error

109
libs/gst/base/gstcollectpads.h
View file

@ -26,15 +26,16 @@
G_BEGIN_DECLS
#define GST_TYPE_COLLECT_PADS (gst_collect_pads_get_type())
#define GST_COLLECT_PADS(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_COLLECT_PADS,GstCollectPads))
#define GST_COLLECT_PADS_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_COLLECT_PADS,GstCollectPadsClass))
#define GST_TYPE_COLLECT_PADS (gst_collect_pads_get_type())
#define GST_COLLECT_PADS(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_COLLECT_PADS,GstCollectPads))
#define GST_COLLECT_PADS_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_COLLECT_PADS,GstCollectPadsClass))
#define GST_COLLECT_PADS_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj),GST_TYPE_COLLECT_PADS,GstCollectPadsClass))
#define GST_IS_COLLECT_PADS(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_COLLECT_PADS))
#define GST_IS_COLLECT_PADS(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_COLLECT_PADS))
#define GST_IS_COLLECT_PADS_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_COLLECT_PADS))
typedef struct _GstCollectData GstCollectData;
typedef struct _GstCollectPads GstCollectPads;
typedef struct _GstCollectPadsPrivate GstCollectPadsPrivate;
typedef struct _GstCollectPadsClass GstCollectPadsClass;
/**
@ -49,6 +50,29 @@ typedef struct _GstCollectPadsClass GstCollectPadsClass;
*/
typedef void (*GstCollectDataDestroyNotify) (GstCollectData *data);
/**
* GstCollectPadsClipFunction:
* @pads: a #GstCollectPads
* @data: a #GstCollectData
* @buffer: a #GstBuffer
* @user_data: user data
*
* A function that will be called when @buffer is received on the pad managed
* by @data in the collecpad object @pads.
*
* The function should use the segment of @data and the negotiated media type on
* the pad to perform clipping of @buffer.
*
* This function takes ownership of @buffer.
*
* Returns: a #GstBuffer that contains the clipped data of @buffer or NULL when
* the buffer has been clipped completely.
*
* Since: 0.10.26
*/
typedef GstBuffer * (*GstCollectPadsClipFunction) (GstCollectPads *pads, GstCollectData *data,
GstBuffer *buffer, gpointer user_data);
/**
* GstCollectData:
* @collect: owner #GstCollectPads
@ -62,10 +86,10 @@ typedef void (*GstCollectDataDestroyNotify) (GstCollectData *data);
struct _GstCollectData
{
/* with LOCK of @collect */
GstCollectPads *collect;
GstPad *pad;
GstBuffer *buffer;
guint pos;
GstCollectPads *collect;
GstPad *pad;
GstBuffer *buffer;
guint pos;
GstSegment segment;
/*< private >*/
@ -111,31 +135,32 @@ struct _GstCollectPads {
GstObject object;
/*< public >*/ /* with LOCK */
GSList *data; /* list of CollectData items */
GSList *data; /* list of CollectData items */
/*< private >*/
guint32 cookie; /* @data list cookie */
guint32 cookie; /* @data list cookie */
/* with LOCK */
GCond *cond; /* to signal removal of data */
GCond *cond; /* to signal removal of data */
GstCollectPadsFunction func; /* function and user_data for callback */
gpointer user_data;
GstCollectPadsFunction func; /* function and user_data for callback */
gpointer user_data;
guint numpads; /* number of pads in @data */
guint queuedpads; /* number of pads with a buffer */
guint eospads; /* number of pads that are EOS */
guint numpads; /* number of pads in @data */
guint queuedpads; /* number of pads with a buffer */
guint eospads; /* number of pads that are EOS */
/* with LOCK and PAD_LOCK*/
gboolean started;
gboolean started;
/*< private >*/
union {
struct {
/* since 0.10.6 */ /* with PAD_LOCK */
GMutex *pad_lock; /* used to serialize add/remove */
GMutex *pad_lock; /* used to serialize add/remove */
GSList *pad_list; /* updated pad list */
guint32 pad_cookie; /* updated cookie */
guint32 pad_cookie; /* updated cookie */
GstCollectPadsPrivate *priv;
} ABI;
/* adding + 0 to mark ABI change to be undone later */
gpointer _gst_reserved[GST_PADDING + 0];
@ -152,40 +177,44 @@ struct _GstCollectPadsClass {
GType gst_collect_pads_get_type(void);
/* creating the object */
GstCollectPads* gst_collect_pads_new (void);
GstCollectPads* gst_collect_pads_new (void);
/* set the callback */
void gst_collect_pads_set_function (GstCollectPads *pads, GstCollectPadsFunction func,
gpointer user_data);
/* set the callbacks */
void gst_collect_pads_set_function (GstCollectPads *pads, GstCollectPadsFunction func,
gpointer user_data);
void gst_collect_pads_set_clip_function (GstCollectPads *pads, GstCollectPadsClipFunction clipfunc,
gpointer user_data);
/* pad management */
GstCollectData* gst_collect_pads_add_pad (GstCollectPads *pads, GstPad *pad, guint size);
GstCollectData* gst_collect_pads_add_pad (GstCollectPads *pads, GstPad *pad, guint size);
GstCollectData* gst_collect_pads_add_pad_full (GstCollectPads *pads, GstPad *pad, guint size, GstCollectDataDestroyNotify destroy_notify);
gboolean gst_collect_pads_remove_pad (GstCollectPads *pads, GstPad *pad);
gboolean gst_collect_pads_is_active (GstCollectPads *pads, GstPad *pad);
gboolean gst_collect_pads_remove_pad (GstCollectPads *pads, GstPad *pad);
gboolean gst_collect_pads_is_active (GstCollectPads *pads, GstPad *pad);
/* start/stop collection */
GstFlowReturn gst_collect_pads_collect (GstCollectPads *pads);
GstFlowReturn gst_collect_pads_collect_range (GstCollectPads *pads, guint64 offset, guint length);
GstFlowReturn gst_collect_pads_collect (GstCollectPads *pads);
GstFlowReturn gst_collect_pads_collect_range (GstCollectPads *pads, guint64 offset, guint length);
void gst_collect_pads_start (GstCollectPads *pads);
void gst_collect_pads_stop (GstCollectPads *pads);
void gst_collect_pads_set_flushing (GstCollectPads *pads, gboolean flushing);
void gst_collect_pads_start (GstCollectPads *pads);
void gst_collect_pads_stop (GstCollectPads *pads);
void gst_collect_pads_set_flushing (GstCollectPads *pads, gboolean flushing);
/* get collected buffers */
GstBuffer* gst_collect_pads_peek (GstCollectPads *pads, GstCollectData *data);
GstBuffer* gst_collect_pads_pop (GstCollectPads *pads, GstCollectData *data);
GstBuffer* gst_collect_pads_peek (GstCollectPads *pads, GstCollectData *data);
GstBuffer* gst_collect_pads_pop (GstCollectPads *pads, GstCollectData *data);
/* get collected bytes */
guint gst_collect_pads_available (GstCollectPads *pads);
guint gst_collect_pads_read (GstCollectPads *pads, GstCollectData *data,
guint8 **bytes, guint size);
guint gst_collect_pads_available (GstCollectPads *pads);
guint gst_collect_pads_read (GstCollectPads *pads, GstCollectData *data,
guint8 **bytes, guint size);
GstBuffer * gst_collect_pads_read_buffer (GstCollectPads * pads, GstCollectData * data,
guint size);
guint size);
GstBuffer * gst_collect_pads_take_buffer (GstCollectPads * pads, GstCollectData * data,
guint size);
guint gst_collect_pads_flush (GstCollectPads *pads, GstCollectData *data,
guint size);
guint size);
guint gst_collect_pads_flush (GstCollectPads *pads, GstCollectData *data,
guint size);
G_END_DECLS

1
win32/common/libgstbase.def
View file

@ -197,6 +197,7 @@ EXPORTS
gst_collect_pads_read
gst_collect_pads_read_buffer
gst_collect_pads_remove_pad
gst_collect_pads_set_clip_function
gst_collect_pads_set_flushing
gst_collect_pads_set_function
gst_collect_pads_start