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10485ea803
Make an alloc vmethod so that subclasses can override or call the default implementation when they want.
250 lines
10 KiB
C
250 lines
10 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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* 2005 Wim Taymans <wim@fluendo.com>
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*
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* gstbasesrc.h:
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_BASE_SRC_H__
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#define __GST_BASE_SRC_H__
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#include <gst/gst.h>
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G_BEGIN_DECLS
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#define GST_TYPE_BASE_SRC (gst_base_src_get_type())
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#define GST_BASE_SRC(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_BASE_SRC,GstBaseSrc))
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#define GST_BASE_SRC_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_BASE_SRC,GstBaseSrcClass))
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#define GST_BASE_SRC_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_BASE_SRC, GstBaseSrcClass))
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#define GST_IS_BASE_SRC(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_BASE_SRC))
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#define GST_IS_BASE_SRC_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_BASE_SRC))
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#define GST_BASE_SRC_CAST(obj) ((GstBaseSrc *)(obj))
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/**
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* GstBaseSrcFlags:
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* @GST_BASE_SRC_STARTED: has source been started
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* @GST_BASE_SRC_FLAG_LAST: offset to define more flags
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*
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* The #GstElement flags that a basesrc element may have.
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*/
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typedef enum {
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GST_BASE_SRC_STARTED = (GST_ELEMENT_FLAG_LAST << 0),
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/* padding */
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GST_BASE_SRC_FLAG_LAST = (GST_ELEMENT_FLAG_LAST << 2)
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} GstBaseSrcFlags;
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typedef struct _GstBaseSrc GstBaseSrc;
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typedef struct _GstBaseSrcClass GstBaseSrcClass;
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typedef struct _GstBaseSrcPrivate GstBaseSrcPrivate;
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/**
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* GST_BASE_SRC_PAD:
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* @obj: base source instance
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*
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* Gives the pointer to the #GstPad object of the element.
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*/
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#define GST_BASE_SRC_PAD(obj) (GST_BASE_SRC_CAST (obj)->srcpad)
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/**
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* GstBaseSrc:
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*
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* The opaque #GstBaseSrc data structure.
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*/
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struct _GstBaseSrc {
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GstElement element;
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/*< protected >*/
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GstPad *srcpad;
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/* available to subclass implementations */
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/* MT-protected (with LIVE_LOCK) */
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GMutex *live_lock;
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GCond *live_cond;
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gboolean is_live;
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gboolean live_running;
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/* MT-protected (with LOCK) */
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guint blocksize; /* size of buffers when operating push based */
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gboolean can_activate_push; /* some scheduling properties */
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gboolean random_access;
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GstClockID clock_id; /* for syncing */
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/* MT-protected (with STREAM_LOCK *and* OBJECT_LOCK) */
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GstSegment segment;
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/* MT-protected (with STREAM_LOCK) */
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gboolean need_newsegment;
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gint num_buffers;
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gint num_buffers_left;
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gboolean typefind;
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gboolean running;
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GstEvent *pending_seek;
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GstBaseSrcPrivate *priv;
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING_LARGE];
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};
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/**
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* GstBaseSrcClass:
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* @parent_class: Element parent class
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* @get_caps: Called to get the caps to report
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* @negotiate: Negotiated the caps with the peer.
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* @fixate: Called during negotiation if caps need fixating. Implement instead of
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* setting a fixate function on the source pad.
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* @set_caps: Notify subclass of changed output caps
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* @setup_allocation: configure the allocation query
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* @start: Start processing. Subclasses should open resources and prepare
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* to produce data.
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* @stop: Stop processing. Subclasses should use this to close resources.
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* @get_times: Given a buffer, return the start and stop time when it
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* should be pushed out. The base class will sync on the clock using
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* these times.
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* @get_size: Return the total size of the resource, in the configured format.
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* @is_seekable: Check if the source can seek
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* @prepare_seek_segment: Prepare the GstSegment that will be passed to the
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* do_seek vmethod for executing a seek request. Sub-classes should override
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* this if they support seeking in formats other than the configured native
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* format. By default, it tries to convert the seek arguments to the
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* configured native format and prepare a segment in that format.
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* Since: 0.10.13
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* @do_seek: Perform seeking on the resource to the indicated segment.
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* @unlock: Unlock any pending access to the resource. Subclasses should
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* unblock any blocked function ASAP. In particular, any create() function in
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* progress should be unblocked and should return GST_FLOW_WRONG_STATE. Any
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* future @create<!-- -->() function call should also return GST_FLOW_WRONG_STATE
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* until the @unlock_stop<!-- -->() function has been called.
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* @unlock_stop: Clear the previous unlock request. Subclasses should clear
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* any state they set during unlock(), such as clearing command queues.
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* @query: Handle a requested query.
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* @event: Override this to implement custom event handling.
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* @create: Ask the subclass to create a buffer with offset and size.
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* When the subclass returns GST_FLOW_OK, it MUST return a buffer of the
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* requested size unless fewer bytes are available because an EOS condition
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* is near. No buffer should be returned when the return value is different
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* from GST_FLOW_OK. A return value of GST_FLOW_UNEXPECTED signifies that the
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* end of stream is reached. The default implementation will create a new
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* buffer from the negotiated allocator and will call @fill.
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* @fill: Ask the subclass to fill the buffer with data for offset and size. The
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* passed buffer is guaranteed to hold the requested amount of bytes.
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*
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* Subclasses can override any of the available virtual methods or not, as
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* needed. At the minimum, the @create method should be overridden to produce
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* buffers.
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*/
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struct _GstBaseSrcClass {
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GstElementClass parent_class;
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/*< public >*/
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/* virtual methods for subclasses */
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/* get caps from subclass */
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GstCaps* (*get_caps) (GstBaseSrc *src, GstCaps *filter);
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/* decide on caps */
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gboolean (*negotiate) (GstBaseSrc *src);
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/* called if, in negotiation, caps need fixating */
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void (*fixate) (GstBaseSrc *src, GstCaps *caps);
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/* notify the subclass of new caps */
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gboolean (*set_caps) (GstBaseSrc *src, GstCaps *caps);
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/* setup allocation query */
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gboolean (*setup_allocation) (GstBaseSrc *src, GstQuery *query);
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/* start and stop processing, ideal for opening/closing the resource */
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gboolean (*start) (GstBaseSrc *src);
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gboolean (*stop) (GstBaseSrc *src);
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/* given a buffer, return start and stop time when it should be pushed
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* out. The base class will sync on the clock using these times. */
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void (*get_times) (GstBaseSrc *src, GstBuffer *buffer,
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GstClockTime *start, GstClockTime *end);
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/* get the total size of the resource in bytes */
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gboolean (*get_size) (GstBaseSrc *src, guint64 *size);
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/* check if the resource is seekable */
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gboolean (*is_seekable) (GstBaseSrc *src);
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/* Prepare the segment on which to perform do_seek(), converting to the
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* current basesrc format. */
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gboolean (*prepare_seek_segment) (GstBaseSrc *src, GstEvent *seek,
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GstSegment *segment);
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/* notify subclasses of a seek */
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gboolean (*do_seek) (GstBaseSrc *src, GstSegment *segment);
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/* unlock any pending access to the resource. subclasses should unlock
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* any function ASAP. */
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gboolean (*unlock) (GstBaseSrc *src);
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/* Clear any pending unlock request, as we succeeded in unlocking */
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gboolean (*unlock_stop) (GstBaseSrc *src);
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/* notify subclasses of a query */
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gboolean (*query) (GstBaseSrc *src, GstQuery *query);
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/* notify subclasses of an event */
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gboolean (*event) (GstBaseSrc *src, GstEvent *event);
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/* ask the subclass to create a buffer with offset and size, the default
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* implementation will call alloc and fill. */
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GstFlowReturn (*create) (GstBaseSrc *src, guint64 offset, guint size,
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GstBuffer **buf);
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/* ask the subclass to allocate an output buffer. The default implementation
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* will use the negotiated allocator. */
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GstFlowReturn (*alloc) (GstBaseSrc *src, guint64 offset, guint size,
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GstBuffer **buf);
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/* ask the subclass to fill the buffer with data from offset and size */
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GstFlowReturn (*fill) (GstBaseSrc *src, guint64 offset, guint size,
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GstBuffer *buf);
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING_LARGE];
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};
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GType gst_base_src_get_type (void);
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GstFlowReturn gst_base_src_wait_playing (GstBaseSrc *src);
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void gst_base_src_set_live (GstBaseSrc *src, gboolean live);
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gboolean gst_base_src_is_live (GstBaseSrc *src);
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void gst_base_src_set_format (GstBaseSrc *src, GstFormat format);
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void gst_base_src_set_dynamic_size (GstBaseSrc * src, gboolean dynamic);
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gboolean gst_base_src_query_latency (GstBaseSrc *src, gboolean * live,
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GstClockTime * min_latency,
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GstClockTime * max_latency);
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void gst_base_src_set_blocksize (GstBaseSrc *src, guint blocksize);
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guint gst_base_src_get_blocksize (GstBaseSrc *src);
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void gst_base_src_set_do_timestamp (GstBaseSrc *src, gboolean timestamp);
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gboolean gst_base_src_get_do_timestamp (GstBaseSrc *src);
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gboolean gst_base_src_new_seamless_segment (GstBaseSrc *src, gint64 start, gint64 stop, gint64 position);
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gboolean gst_base_src_set_caps (GstBaseSrc *src, GstCaps *caps);
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G_END_DECLS
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#endif /* __GST_BASE_SRC_H__ */
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