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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <>
* 2000 Wim Taymans <>
* 2005 Wim Taymans <>
* gstbasesrc.h:
* 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
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
#ifndef __GST_BASE_SRC_H__
#define __GST_BASE_SRC_H__
#include <gst/gst.h>
#define GST_TYPE_BASE_SRC (gst_base_src_get_type())
#define GST_BASE_SRC_CAST(obj) ((GstBaseSrc *)(obj))
* GstBaseSrcFlags:
* @GST_BASE_SRC_FLAG_STARTING: has source is starting
* @GST_BASE_SRC_FLAG_STARTED: has source been started
* @GST_BASE_SRC_FLAG_LAST: offset to define more flags
* The #GstElement flags that a basesrc element may have.
typedef enum {
/* padding */
} GstBaseSrcFlags;
typedef struct _GstBaseSrc GstBaseSrc;
typedef struct _GstBaseSrcClass GstBaseSrcClass;
typedef struct _GstBaseSrcPrivate GstBaseSrcPrivate;
* @obj: base source instance
* Gives the pointer to the #GstPad object of the element.
#define GST_BASE_SRC_PAD(obj) (GST_BASE_SRC_CAST (obj)->srcpad)
* GstBaseSrc:
* The opaque #GstBaseSrc data structure.
struct _GstBaseSrc {
GstElement element;
/*< protected >*/
GstPad *srcpad;
/* available to subclass implementations */
/* MT-protected (with LIVE_LOCK) */
GMutex live_lock;
GCond live_cond;
gboolean is_live;
gboolean live_running;
/* MT-protected (with LOCK) */
guint blocksize; /* size of buffers when operating push based */
gboolean can_activate_push; /* some scheduling properties */
gboolean random_access;
GstClockID clock_id; /* for syncing */
/* MT-protected (with STREAM_LOCK *and* OBJECT_LOCK) */
GstSegment segment;
/* MT-protected (with STREAM_LOCK) */
gboolean need_newsegment;
gint num_buffers;
gint num_buffers_left;
gboolean typefind;
gboolean running;
GstEvent *pending_seek;
GstBaseSrcPrivate *priv;
/*< private >*/
gpointer _gst_reserved[GST_PADDING_LARGE];
* GstBaseSrcClass:
* @parent_class: Element parent class
* @get_caps: Called to get the caps to report
* @negotiate: Negotiated the caps with the peer.
* @fixate: Called during negotiation if caps need fixating. Implement instead of
* setting a fixate function on the source pad.
* @set_caps: Notify subclass of changed output caps
* @decide_allocation: configure the allocation query
* @start: Start processing. Subclasses should open resources and prepare
* to produce data. Implementation should call gst_base_src_start_complete()
* when the operation completes, either from the current thread or any other
* thread that finishes the start operation asynchronously.
* @stop: Stop processing. Subclasses should use this to close resources.
* @get_times: Given a buffer, return the start and stop time when it
* should be pushed out. The base class will sync on the clock using
* these times.
* @get_size: Return the total size of the resource, in the format set by
* gst_base_src_set_format().
* @is_seekable: Check if the source can seek
* @prepare_seek_segment: Prepare the #GstSegment that will be passed to the
* #GstBaseSrcClass.do_seek() vmethod for executing a seek
* request. Sub-classes should override this if they support seeking in
* formats other than the configured native format. By default, it tries to
* convert the seek arguments to the configured native format and prepare a
* segment in that format.
* @do_seek: Perform seeking on the resource to the indicated segment.
* @unlock: Unlock any pending access to the resource. Subclasses should unblock
* any blocked function ASAP. In particular, any create() function in
* progress should be unblocked and should return GST_FLOW_FLUSHING. Any
* future #GstBaseSrcClass.create() function call should also return
* GST_FLOW_FLUSHING until the #GstBaseSrcClass.unlock_stop() function has
* been called.
* @unlock_stop: Clear the previous unlock request. Subclasses should clear any
* state they set during #GstBaseSrcClass.unlock(), such as clearing command
* queues.
* @query: Handle a requested query.
* @event: Override this to implement custom event handling.
* @create: Ask the subclass to create a buffer with offset and size. When the
* subclass returns GST_FLOW_OK, it MUST return a buffer of the requested size
* unless fewer bytes are available because an EOS condition is near. No
* buffer should be returned when the return value is different from
* GST_FLOW_OK. A return value of GST_FLOW_EOS signifies that the end of
* stream is reached. The default implementation will call
* #GstBaseSrcClass.alloc() and then call #GstBaseSrcClass.fill().
* @alloc: Ask the subclass to allocate a buffer with for offset and size. The
* default implementation will create a new buffer from the negotiated allocator.
* @fill: Ask the subclass to fill the buffer with data for offset and size. The
* passed buffer is guaranteed to hold the requested amount of bytes.
* Subclasses can override any of the available virtual methods or not, as
* needed. At the minimum, the @create method should be overridden to produce
* buffers.
struct _GstBaseSrcClass {
GstElementClass parent_class;
/*< public >*/
/* virtual methods for subclasses */
/* get caps from subclass */
GstCaps* (*get_caps) (GstBaseSrc *src, GstCaps *filter);
/* decide on caps */
gboolean (*negotiate) (GstBaseSrc *src);
/* called if, in negotiation, caps need fixating */
GstCaps * (*fixate) (GstBaseSrc *src, GstCaps *caps);
/* notify the subclass of new caps */
gboolean (*set_caps) (GstBaseSrc *src, GstCaps *caps);
/* setup allocation query */
gboolean (*decide_allocation) (GstBaseSrc *src, GstQuery *query);
/* start and stop processing, ideal for opening/closing the resource */
gboolean (*start) (GstBaseSrc *src);
gboolean (*stop) (GstBaseSrc *src);
/* given a buffer, return start and stop time when it should be pushed
* out. The base class will sync on the clock using these times. */
void (*get_times) (GstBaseSrc *src, GstBuffer *buffer,
GstClockTime *start, GstClockTime *end);
/* get the total size of the resource in the format set by
* gst_base_src_set_format() */
gboolean (*get_size) (GstBaseSrc *src, guint64 *size);
/* check if the resource is seekable */
gboolean (*is_seekable) (GstBaseSrc *src);
/* Prepare the segment on which to perform do_seek(), converting to the
* current basesrc format. */
gboolean (*prepare_seek_segment) (GstBaseSrc *src, GstEvent *seek,
GstSegment *segment);
/* notify subclasses of a seek */
gboolean (*do_seek) (GstBaseSrc *src, GstSegment *segment);
/* unlock any pending access to the resource. subclasses should unlock
* any function ASAP. */
gboolean (*unlock) (GstBaseSrc *src);
/* Clear any pending unlock request, as we succeeded in unlocking */
gboolean (*unlock_stop) (GstBaseSrc *src);
/* notify subclasses of a query */
gboolean (*query) (GstBaseSrc *src, GstQuery *query);
/* notify subclasses of an event */
gboolean (*event) (GstBaseSrc *src, GstEvent *event);
/* ask the subclass to create a buffer with offset and size, the default
* 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);
/*< private >*/
gpointer _gst_reserved[GST_PADDING_LARGE];
GType gst_base_src_get_type (void);
GstFlowReturn gst_base_src_wait_playing (GstBaseSrc *src);
void gst_base_src_set_live (GstBaseSrc *src, gboolean live);
gboolean gst_base_src_is_live (GstBaseSrc *src);
void gst_base_src_set_format (GstBaseSrc *src, GstFormat format);
void gst_base_src_set_dynamic_size (GstBaseSrc * src, gboolean dynamic);
void gst_base_src_set_automatic_eos (GstBaseSrc * src, gboolean automatic_eos);
void gst_base_src_set_async (GstBaseSrc *src, gboolean async);
gboolean gst_base_src_is_async (GstBaseSrc *src);
void gst_base_src_start_complete (GstBaseSrc * basesrc, GstFlowReturn ret);
GstFlowReturn gst_base_src_start_wait (GstBaseSrc * basesrc);
gboolean gst_base_src_query_latency (GstBaseSrc *src, gboolean * live,
GstClockTime * min_latency,
GstClockTime * max_latency);
void gst_base_src_set_blocksize (GstBaseSrc *src, guint blocksize);
guint gst_base_src_get_blocksize (GstBaseSrc *src);
void gst_base_src_set_do_timestamp (GstBaseSrc *src, gboolean timestamp);
gboolean gst_base_src_get_do_timestamp (GstBaseSrc *src);
gboolean gst_base_src_new_seamless_segment (GstBaseSrc *src, gint64 start, gint64 stop, gint64 time);
gboolean gst_base_src_set_caps (GstBaseSrc *src, GstCaps *caps);
GstBufferPool * gst_base_src_get_buffer_pool (GstBaseSrc *src);
void gst_base_src_get_allocator (GstBaseSrc *src,
GstAllocator **allocator,
GstAllocationParams *params);
G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstBaseSrc, gst_object_unref)
#endif /* __GST_BASE_SRC_H__ */