author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 31 Aug 2010 15:30:33 +0300 | |
branch | RCL_3 |
changeset 29 | 567bb019e3e3 |
parent 0 | 0e761a78d257 |
child 30 | 7e817e7e631c |
permissions | -rw-r--r-- |
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/* 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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* gstbaseaudiosink.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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|
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/* a base class for audio sinks. |
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* |
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* It uses a ringbuffer to schedule playback of samples. This makes |
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* it very easy to drop or insert samples to align incoming |
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* buffers to the exact playback timestamp. |
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* |
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* Subclasses must provide a ringbuffer pointing to either DMA |
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* memory or regular memory. A subclass should also call a callback |
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* function when it has played N segments in the buffer. The subclass |
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* is free to use a thread to signal this callback, use EIO or any |
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* other mechanism. |
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* |
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* The base class is able to operate in push or pull mode. The chain |
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* mode will queue the samples in the ringbuffer as much as possible. |
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* The available space is calculated in the callback function. |
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* |
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* The pull mode will pull_range() a new buffer of N samples with a |
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* configurable latency. This allows for high-end real time |
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* audio processing pipelines driven by the audiosink. The callback |
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* function will be used to perform a pull_range() on the sinkpad. |
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* The thread scheduling the callback can be a real-time thread. |
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* |
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* Subclasses must implement a GstRingBuffer in addition to overriding |
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* the methods in GstBaseSink and this class. |
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*/ |
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#ifndef __GST_BASE_AUDIO_SINK_H__ |
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#define __GST_BASE_AUDIO_SINK_H__ |
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#include <gst/gst.h> |
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#include <gst/base/gstbasesink.h> |
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#include "gstringbuffer.h" |
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#include "gstaudioclock.h" |
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G_BEGIN_DECLS |
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#define GST_TYPE_BASE_AUDIO_SINK (gst_base_audio_sink_get_type()) |
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#define GST_BASE_AUDIO_SINK(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_BASE_AUDIO_SINK,GstBaseAudioSink)) |
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#define GST_BASE_AUDIO_SINK_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_BASE_AUDIO_SINK,GstBaseAudioSinkClass)) |
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#define GST_BASE_AUDIO_SINK_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_BASE_AUDIO_SINK, GstBaseAudioSinkClass)) |
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#define GST_IS_BASE_AUDIO_SINK(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_BASE_AUDIO_SINK)) |
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#define GST_IS_BASE_AUDIO_SINK_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_BASE_AUDIO_SINK)) |
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/** |
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* GST_BASE_AUDIO_SINK_CLOCK: |
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* @obj: a #GstBaseAudioSink |
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* |
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* Get the #GstClock of @obj. |
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*/ |
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#define GST_BASE_AUDIO_SINK_CLOCK(obj) (GST_BASE_AUDIO_SINK (obj)->clock) |
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/** |
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* GST_BASE_AUDIO_SINK_PAD: |
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* @obj: a #GstBaseAudioSink |
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* |
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* Get the sink #GstPad of @obj. |
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*/ |
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#define GST_BASE_AUDIO_SINK_PAD(obj) (GST_BASE_SINK (obj)->sinkpad) |
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/** |
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* GstBaseAudioSinkSlaveMethod: |
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* @GST_BASE_AUDIO_SINK_SLAVE_RESAMPLE: Resample to match the master clock |
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* @GST_BASE_AUDIO_SINK_SLAVE_SKEW: Adjust playout pointer when master clock |
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* drifts too much. |
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* @GST_BASE_AUDIO_SINK_SLAVE_NONE: No adjustment is done. |
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* |
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* Different possible clock slaving algorithms used when the internal audio |
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* clock is not selected as the pipeline master clock. |
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*/ |
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typedef enum |
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{ |
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GST_BASE_AUDIO_SINK_SLAVE_RESAMPLE, |
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GST_BASE_AUDIO_SINK_SLAVE_SKEW, |
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GST_BASE_AUDIO_SINK_SLAVE_NONE |
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} GstBaseAudioSinkSlaveMethod; |
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#define GST_TYPE_BASE_AUDIO_SINK_SLAVE_METHOD (gst_base_audio_sink_slave_method_get_type ()) |
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typedef struct _GstBaseAudioSink GstBaseAudioSink; |
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typedef struct _GstBaseAudioSinkClass GstBaseAudioSinkClass; |
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typedef struct _GstBaseAudioSinkPrivate GstBaseAudioSinkPrivate; |
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/** |
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* GstBaseAudioSink: |
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* |
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* Opaque #GstBaseAudioSink. |
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*/ |
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struct _GstBaseAudioSink { |
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GstBaseSink element; |
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/*< protected >*/ /* with LOCK */ |
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/* our ringbuffer */ |
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GstRingBuffer *ringbuffer; |
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/* required buffer and latency in microseconds */ |
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guint64 buffer_time; |
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guint64 latency_time; |
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/* the next sample to write */ |
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guint64 next_sample; |
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/* clock */ |
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gboolean provide_clock; |
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GstClock *provided_clock; |
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/*< private >*/ |
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GstBaseAudioSinkPrivate *priv; |
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gpointer _gst_reserved[GST_PADDING - 1]; |
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}; |
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/** |
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* GstBaseAudioSinkClass: |
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* @parent_class: the parent class. |
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* @create_ringbuffer: create and return a #GstRingBuffer to write to. |
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* |
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* #GstBaseAudioSink class. Override the vmethod to implement |
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* functionality. |
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*/ |
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struct _GstBaseAudioSinkClass { |
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GstBaseSinkClass parent_class; |
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/* subclass ringbuffer allocation */ |
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GstRingBuffer* (*create_ringbuffer) (GstBaseAudioSink *sink); |
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/*< private >*/ |
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gpointer _gst_reserved[GST_PADDING]; |
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}; |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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GType gst_base_audio_sink_get_type(void); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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GType gst_base_audio_sink_slave_method_get_type (void); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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GstRingBuffer *gst_base_audio_sink_create_ringbuffer (GstBaseAudioSink *sink); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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void gst_base_audio_sink_set_provide_clock (GstBaseAudioSink *sink, gboolean provide); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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gboolean gst_base_audio_sink_get_provide_clock (GstBaseAudioSink *sink); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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void gst_base_audio_sink_set_slave_method (GstBaseAudioSink *sink, |
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GstBaseAudioSinkSlaveMethod method); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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GstBaseAudioSinkSlaveMethod |
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gst_base_audio_sink_get_slave_method (GstBaseAudioSink *sink); |
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G_END_DECLS |
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#endif /* __GST_BASE_AUDIO_SINK_H__ */ |