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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;