mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-18 06:16:36 +00:00
cf4fbc005c
Pass a GstQuery ** to the query handlers so that they can make the query writable before using a setter on it. Port code to new API.
251 lines
10 KiB
C
251 lines
10 KiB
C
/* GStreamer
|
|
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
|
|
* 2000 Wim Taymans <wtay@chello.be>
|
|
* 2005 Wim Taymans <wim@fluendo.com>
|
|
*
|
|
* 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
|
|
* 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_SRC_H__
|
|
#define __GST_BASE_SRC_H__
|
|
|
|
#include <gst/gst.h>
|
|
|
|
G_BEGIN_DECLS
|
|
|
|
#define GST_TYPE_BASE_SRC (gst_base_src_get_type())
|
|
#define GST_BASE_SRC(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_BASE_SRC,GstBaseSrc))
|
|
#define GST_BASE_SRC_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_BASE_SRC,GstBaseSrcClass))
|
|
#define GST_BASE_SRC_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_BASE_SRC, GstBaseSrcClass))
|
|
#define GST_IS_BASE_SRC(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_BASE_SRC))
|
|
#define GST_IS_BASE_SRC_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_BASE_SRC))
|
|
#define GST_BASE_SRC_CAST(obj) ((GstBaseSrc *)(obj))
|
|
|
|
/**
|
|
* GstBaseSrcFlags:
|
|
* @GST_BASE_SRC_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 {
|
|
GST_BASE_SRC_STARTED = (GST_ELEMENT_FLAG_LAST << 0),
|
|
/* padding */
|
|
GST_BASE_SRC_FLAG_LAST = (GST_ELEMENT_FLAG_LAST << 2)
|
|
} GstBaseSrcFlags;
|
|
|
|
typedef struct _GstBaseSrc GstBaseSrc;
|
|
typedef struct _GstBaseSrcClass GstBaseSrcClass;
|
|
typedef struct _GstBaseSrcPrivate GstBaseSrcPrivate;
|
|
|
|
/**
|
|
* GST_BASE_SRC_PAD:
|
|
* @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) */
|
|
gint blocksize; /* size of buffers when operating push based */
|
|
gboolean can_activate_push; /* some scheduling properties */
|
|
GstActivateMode pad_mode;
|
|
gboolean seekable; /* not used anymore */
|
|
gboolean random_access;
|
|
|
|
GstClockID clock_id; /* for syncing */
|
|
GstClockTime end_time;
|
|
|
|
/* MT-protected (with STREAM_LOCK *and* OBJECT_LOCK) */
|
|
GstSegment segment;
|
|
/* MT-protected (with STREAM_LOCK) */
|
|
gboolean need_newsegment;
|
|
|
|
guint64 offset; /* current offset in the resource, unused */
|
|
guint64 size; /* total size of the resource, unused */
|
|
|
|
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
|
|
* @set_caps: Notify subclass of changed output caps
|
|
* @negotiate: Negotiated the caps with the peer.
|
|
* @newsegment: Generate and send a new_segment event (UNUSED)
|
|
* @start: Start processing. Subclasses should open resources and prepare
|
|
* to produce data.
|
|
* @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 configured format.
|
|
* @is_seekable: Check if the source can seek
|
|
* @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_WRONG_STATE. Any
|
|
* future @create<!-- -->() function call should also return GST_FLOW_WRONG_STATE
|
|
* until the @unlock_stop<!-- -->() function has been called.
|
|
* @unlock_stop: Clear the previous unlock request. Subclasses should clear
|
|
* any state they set during unlock(), such as clearing command queues.
|
|
* @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_UNEXPECTED signifies that the
|
|
* end of stream is reached.
|
|
* @do_seek: Perform seeking on the resource to the indicated segment.
|
|
* @prepare_seek_segment: Prepare the GstSegment that will be passed to the
|
|
* 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.
|
|
* Since: 0.10.13
|
|
* @query: Handle a requested query.
|
|
* @check_get_range: Check whether the source would support pull-based
|
|
* operation if it were to be opened now. This vfunc is optional, but
|
|
* should be implemented if possible to avoid unnecessary start/stop
|
|
* cycles. The default implementation will open and close the resource
|
|
* to find out whether get_range is supported, and that is usually
|
|
* undesirable.
|
|
* @fixate: Called during negotiation if caps need fixating. Implement instead of
|
|
* setting a fixate function on the source pad.
|
|
*
|
|
* 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);
|
|
/* notify the subclass of new caps */
|
|
gboolean (*set_caps) (GstBaseSrc *src, GstCaps *caps);
|
|
|
|
/* decide on caps */
|
|
gboolean (*negotiate) (GstBaseSrc *src);
|
|
/* called if, in negotiation, caps need fixating */
|
|
void (*fixate) (GstBaseSrc *src, GstCaps *caps);
|
|
|
|
/* 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 bytes */
|
|
gboolean (*get_size) (GstBaseSrc *src, guint64 *size);
|
|
|
|
/* check if the resource is seekable */
|
|
gboolean (*is_seekable) (GstBaseSrc *src);
|
|
/* check whether the source would support pull-based operation if
|
|
* it were to be opened now. This vfunc is optional, but should be
|
|
* implemented if possible to avoid unnecessary start/stop cycles.
|
|
* The default implementation will open and close the resource to
|
|
* find out whether get_range is supported and that is usually
|
|
* undesirable. */
|
|
gboolean (*check_get_range) (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 */
|
|
GstFlowReturn (*create) (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);
|
|
|
|
gboolean gst_base_src_query_latency (GstBaseSrc *src, gboolean * live,
|
|
GstClockTime * min_latency,
|
|
GstClockTime * max_latency);
|
|
|
|
void gst_base_src_set_blocksize (GstBaseSrc *src, gulong blocksize);
|
|
gulong 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 position);
|
|
G_END_DECLS
|
|
|
|
#endif /* __GST_BASE_SRC_H__ */
|