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95 lines
3.3 KiB
C
95 lines
3.3 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2005 Wim Taymans <wim@fluendo.com>
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*
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* gstaudiosink.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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/* a base class for simple audio sinks.
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*
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* This base class only requires subclasses to implement a set
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* of simple functions.
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*
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* - open: open the device with the specified caps
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* - write: write the samples to the audio device
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* - close: close the device
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* - delay: the number of samples queued in the device
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* - reset: unblock a write to the device and reset.
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*
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* All scheduling of samples and timestamps is done in this
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* base class together with the GstBaseAudioSink using a
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* default implementation of a ringbuffer that uses threads.
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*/
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#ifndef __GST_AUDIO_SINK_H__
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#define __GST_AUDIO_SINK_H__
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#include <gst/gst.h>
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#include <gst/audio/gstbaseaudiosink.h>
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G_BEGIN_DECLS
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#define GST_TYPE_AUDIO_SINK (gst_audio_sink_get_type())
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#define GST_AUDIO_SINK(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AUDIO_SINK,GstAudioSink))
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#define GST_AUDIO_SINK_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_AUDIO_SINK,GstAudioSinkClass))
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#define GST_AUDIO_SINK_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj),GST_TYPE_AUDIO_SINK,GstAudioSinkClass))
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#define GST_IS_AUDIO_SINK(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AUDIO_SINK))
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#define GST_IS_AUDIO_SINK_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_AUDIO_SINK))
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typedef struct _GstAudioSink GstAudioSink;
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typedef struct _GstAudioSinkClass GstAudioSinkClass;
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struct _GstAudioSink {
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GstBaseAudioSink element;
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/*< private >*/ /* with LOCK */
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GThread *thread;
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING];
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};
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struct _GstAudioSinkClass {
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GstBaseAudioSinkClass parent_class;
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/* vtable */
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/* open the device with given specs */
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gboolean (*open) (GstAudioSink *sink);
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/* prepare resources and state to operate with the given specs */
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gboolean (*prepare) (GstAudioSink *sink, GstRingBufferSpec *spec);
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/* undo anything that was done in prepare() */
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gboolean (*unprepare) (GstAudioSink *sink);
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/* close the device */
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gboolean (*close) (GstAudioSink *sink);
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/* write samples to the device */
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guint (*write) (GstAudioSink *sink, gpointer data, guint length);
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/* get number of samples queued in the device */
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guint (*delay) (GstAudioSink *sink);
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/* reset the audio device, unblock from a write */
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void (*reset) (GstAudioSink *sink);
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING];
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};
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GType gst_audio_sink_get_type(void);
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G_END_DECLS
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#endif /* __GST_AUDIO_SINK_H__ */
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