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GObject ╰── GInitiallyUnowned ╰── GstObject ╰── GstElement ╰── GstBaseSink ╰── GstAudioBaseSink ╰── GstAudioSink
This is the most simple base class for audio sinks that only requires subclasses to implement a set of simple functions:
open()
prepare()
write()
reset()
delay()
unprepare()
close()
All scheduling of samples and timestamps is done in this base class together with GstAudioBaseSink using a default implementation of a GstAudioRingBuffer that uses threads.
struct GstAudioSinkClass {
  GstAudioBaseSinkClass parent_class;
  /* vtable */
  /* open the device with given specs */
  gboolean (*open)      (GstAudioSink *sink);
  /* prepare resources and state to operate with the given specs */
  gboolean (*prepare)   (GstAudioSink *sink, GstAudioRingBufferSpec *spec);
  /* undo anything that was done in prepare() */
  gboolean (*unprepare) (GstAudioSink *sink);
  /* close the device */
  gboolean (*close)     (GstAudioSink *sink);
  /* write samples to the device */
  gint     (*write)     (GstAudioSink *sink, gpointer data, guint length);
  /* get number of frames queued in the device */
  guint    (*delay)     (GstAudioSink *sink);
  /* reset the audio device, unblock from a write */
  void     (*reset)     (GstAudioSink *sink);
};
GstAudioSink class. Override the vmethods to implement functionality.
| Open the device. No configuration needs to be done at this point. This function is also used to check if the device is available. | ||
| Prepare the device to operate with the specified parameters. | ||
| Undo operations done in prepare. | ||
| Close the device. | ||
| Write data to the device. | ||
| Return how many frames are still in the device. This is used to drive the synchronisation. | ||
| Returns as quickly as possible from a write and flush any pending samples from the device. |