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Object Hierarchy
GObject ╰── GInitiallyUnowned ╰── GstObject ╰── GstElement ╰── GstBaseSrc ╰── GstPushSrc ╰── GstAudioBaseSrc ╰── GstAudioSrc
Description
This is the most simple base class for audio sources that only requires subclasses to implement a set of simple functions:
:Open the device.open()
:Configure the device with the specified format.prepare()
:Read samples from the device.read()
:Unblock reads and flush the device.reset()
:Get the number of samples in the device but not yet read.delay()
:Undo operations done by prepare.unprepare()
:Close the device.close()
All scheduling of samples and timestamps is done in this base class together with GstAudioBaseSrc using a default implementation of a GstAudioRingBuffer that uses threads.
Types and Values
struct GstAudioSrcClass
struct GstAudioSrcClass { GstAudioBaseSrcClass 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, GstAudioRingBufferSpec *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, GstClockTime *timestamp); /* get number of frames queued in the device */ guint (*delay) (GstAudioSrc *src); /* reset the audio device, unblock from a write */ void (*reset) (GstAudioSrc *src); };
GstAudioSrc class. Override the vmethod to implement functionality.