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GStreamer Base Plugins 0.10 Library Reference Manual | |
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GObject
+----GstObject
+----GstElement
+----GstBaseSrc
+----GstPushSrc
+----GstBaseAudioSrc
+----GstAudioSrc
This is the most simple base class for audio sources that only requires subclasses to implement a set of simple functions:
open() |
Open the device. |
prepare() |
Configure the device with the specified format. |
read() |
Read samples from the device. |
reset() |
Unblock reads and flush the device. |
delay() |
Get the number of samples in the device but not yet read. |
unprepare() |
Undo operations done by prepare. |
close() |
Close the device. |
All scheduling of samples and timestamps is done in this base class together with GstBaseAudioSrc using a default implementation of a GstRingBuffer that uses threads.
Last reviewed on 2006-09-27 (0.10.12)
typedef struct {
GstBaseAudioSrcClass parent_class;
/* vtable */
/* open the device with given specs */
gboolean (*open) (GstAudioSrc *src);
/* prepare resources and state to operate with the given specs */
gboolean (*prepare) (GstAudioSrc *src, GstRingBufferSpec *spec);
/* undo anything that was done in prepare() */
gboolean (*unprepare) (GstAudioSrc *src);
/* close the device */
gboolean (*close) (GstAudioSrc *src);
/* read samples from the device */
guint (*read) (GstAudioSrc *src, gpointer data, guint length);
/* get number of samples queued in the device */
guint (*delay) (GstAudioSrc *src);
/* reset the audio device, unblock from a write */
void (*reset) (GstAudioSrc *src);
} GstAudioSrcClass;
GstAudioSrc class. Override the vmethod to implement functionality.
GstBaseAudioSrcClass parent_class; |
the parent class. |
open () |
open the device with the specified caps |
prepare () |
configure device with format |
unprepare () |
undo the configuration |
close () |
close the device |
read () |
read samples to the audio device |
delay () |
the number of samples queued in the device |
reset () |
unblock a read to the device and reset. |