/* GStreamer * Copyright (C) 1999,2000 Erik Walthinsen * 2005 Wim Taymans * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #ifndef __GST_BASE_TRANSFORM_H__ #define __GST_BASE_TRANSFORM_H__ #include G_BEGIN_DECLS #define GST_TYPE_BASE_TRANSFORM (gst_base_transform_get_type()) #define GST_BASE_TRANSFORM(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_BASE_TRANSFORM,GstBaseTransform)) #define GST_BASE_TRANSFORM_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_BASE_TRANSFORM,GstBaseTransformClass)) #define GST_BASE_TRANSFORM_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj),GST_TYPE_BASE_TRANSFORM,GstBaseTransformClass)) #define GST_IS_BASE_TRANSFORM(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_BASE_TRANSFORM)) #define GST_IS_BASE_TRANSFORM_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_BASE_TRANSFORM)) /* since 0.10.4 */ #define GST_BASE_TRANSFORM_CAST(obj) ((GstBaseTransform *)(obj)) /** * GST_BASE_TRANSFORM_SINK_NAME: * * The name of the templates for the sink pad. */ #define GST_BASE_TRANSFORM_SINK_NAME "sink" /** * GST_BASE_TRANSFORM_SRC_NAME: * * The name of the templates for the source pad. */ #define GST_BASE_TRANSFORM_SRC_NAME "src" /** * GST_BASE_TRANSFORM_SRC_PAD: * @obj: base transform instance * * Gives the pointer to the source #GstPad object of the element. * * Since: 0.10.4 */ #define GST_BASE_TRANSFORM_SRC_PAD(obj) (GST_BASE_TRANSFORM_CAST (obj)->srcpad) /** * GST_BASE_TRANSFORM_SINK_PAD: * @obj: base transform instance * * Gives the pointer to the sink #GstPad object of the element. * * Since: 0.10.4 */ #define GST_BASE_TRANSFORM_SINK_PAD(obj) (GST_BASE_TRANSFORM_CAST (obj)->sinkpad) /** * GST_BASE_TRANSFORM_FLOW_DROPPED: * * A #GstFlowReturn that can be returned from transform and transform_ip to * indicate that no output buffer was generated. * * Since: 0.10.13 */ #define GST_BASE_TRANSFORM_FLOW_DROPPED GST_FLOW_CUSTOM_SUCCESS /** * GST_BASE_TRANSFORM_LOCK: * @obj: base transform instance * * Obtain a lock to protect the transform function from concurrent access. * * Since: 0.10.13 */ #define GST_BASE_TRANSFORM_LOCK(obj) g_mutex_lock (GST_BASE_TRANSFORM_CAST (obj)->transform_lock) /** * GST_BASE_TRANSFORM_UNLOCK: * @obj: base transform instance * * Release the lock that protects the transform function from concurrent access. * * Since: 0.10.13 */ #define GST_BASE_TRANSFORM_UNLOCK(obj) g_mutex_unlock (GST_BASE_TRANSFORM_CAST (obj)->transform_lock) typedef struct _GstBaseTransform GstBaseTransform; typedef struct _GstBaseTransformClass GstBaseTransformClass; typedef struct _GstBaseTransformPrivate GstBaseTransformPrivate; /** * GstBaseTransform: * @element: the parent element. * * The opaque #GstBaseTransform data structure. */ struct _GstBaseTransform { GstElement element; /*< protected >*/ /* source and sink pads */ GstPad *sinkpad; GstPad *srcpad; /* Set by sub-class */ gboolean passthrough; gboolean always_in_place; GstCaps *cache_caps1; guint cache_caps1_size; GstCaps *cache_caps2; guint cache_caps2_size; gboolean have_same_caps; gboolean delay_configure; gboolean pending_configure; gboolean negotiated; gboolean have_newsegment; /* MT-protected (with STREAM_LOCK) */ GstSegment segment; GMutex *transform_lock; /*< private >*/ GstBaseTransformPrivate *priv; gpointer _gst_reserved[GST_PADDING_LARGE - 1]; }; /** * GstBaseTransformClass: * @transform_caps: Optional. Given the pad in this direction and the given * caps, what caps are allowed on the other pad in this * element ? * @fixate_caps: Optional. Given the pad in this direction and the given * caps, fixate the caps on the other pad. * @transform_size: Optional. Given the size of a buffer in the given direction * with the given caps, calculate the size in bytes of a buffer * on the other pad with the given other caps. * The default implementation uses get_unit_size and keeps * the number of units the same. * @get_unit_size: Required if the transform is not in-place. * get the size in bytes of one unit for the given caps. * @set_caps: allows the subclass to be notified of the actual caps set. * @start: Optional. * Called when the element starts processing. * Allows opening external resources. * @stop: Optional. * Called when the element stops processing. * Allows closing external resources. * @transform: Required if the element does not operate in-place. * Transforms one incoming buffer to one outgoing buffer. * The function is allowed to change size/timestamp/duration * of the outgoing buffer. * @transform_ip: Required if the element operates in-place. * Transform the incoming buffer in-place. * @event: Optional. * Event handler on the sink pad. This function should return * TRUE if the base class should forward the event. * @src_event: Optional. * Event handler on the source pad. * @passthrough_on_same_caps: If set to TRUE, passthrough mode will be * automatically enabled if the caps are the same. * @prepare_output_buffer: Optional. * Subclasses can override this to do their own * allocation of output buffers. Elements that only do * analysis can return a subbuffer or even just * increment the reference to the input buffer (if in * passthrough mode) * * Subclasses can override any of the available virtual methods or not, as * needed. At minimum either @transform or @transform_ip need to be overridden. * If the element can overwrite the input data with the results (data is of the * same type and quantity) it should provide @transform_ip. */ struct _GstBaseTransformClass { GstElementClass parent_class; /*< public >*/ /* virtual methods for subclasses */ GstCaps* (*transform_caps) (GstBaseTransform *trans, GstPadDirection direction, GstCaps *caps); void (*fixate_caps) (GstBaseTransform *trans, GstPadDirection direction, GstCaps *caps, GstCaps *othercaps); gboolean (*transform_size) (GstBaseTransform *trans, GstPadDirection direction, GstCaps *caps, guint size, GstCaps *othercaps, guint *othersize); gboolean (*get_unit_size) (GstBaseTransform *trans, GstCaps *caps, guint *size); gboolean (*set_caps) (GstBaseTransform *trans, GstCaps *incaps, GstCaps *outcaps); gboolean (*start) (GstBaseTransform *trans); gboolean (*stop) (GstBaseTransform *trans); gboolean (*event) (GstBaseTransform *trans, GstEvent *event); GstFlowReturn (*transform) (GstBaseTransform *trans, GstBuffer *inbuf, GstBuffer *outbuf); GstFlowReturn (*transform_ip) (GstBaseTransform *trans, GstBuffer *buf); /* FIXME: When adjusting the padding, move these to nicer places in the class */ gboolean passthrough_on_same_caps; GstFlowReturn (*prepare_output_buffer) (GstBaseTransform * trans, GstBuffer *input, gint size, GstCaps *caps, GstBuffer **buf); /* src event */ gboolean (*src_event) (GstBaseTransform *trans, GstEvent *event); /*< private >*/ gpointer _gst_reserved[GST_PADDING_LARGE - 1]; }; GType gst_base_transform_get_type (void); void gst_base_transform_set_passthrough (GstBaseTransform *trans, gboolean passthrough); gboolean gst_base_transform_is_passthrough (GstBaseTransform *trans); void gst_base_transform_set_in_place (GstBaseTransform *trans, gboolean in_place); gboolean gst_base_transform_is_in_place (GstBaseTransform *trans); void gst_base_transform_update_qos (GstBaseTransform *trans, gdouble proportion, GstClockTimeDiff diff, GstClockTime timestamp); void gst_base_transform_set_qos_enabled (GstBaseTransform *trans, gboolean enabled); gboolean gst_base_transform_is_qos_enabled (GstBaseTransform *trans); void gst_base_transform_set_gap_aware (GstBaseTransform *trans, gboolean gap_aware); G_END_DECLS #endif /* __GST_BASE_TRANSFORM_H__ */