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GStreamer Base Plugins 0.10 Library Reference Manual | ![]() |
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Top | Description | Object Hierarchy |
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:
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Open the device. |
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Configure the device with the specified format. |
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Read samples from the device. |
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Unblock reads and flush the device. |
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Get the number of samples in the device but not yet read. |
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Undo operations done by prepare. |
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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 |
the parent class. |
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open the device with the specified caps |
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configure device with format |
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undo the configuration |
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close the device |
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read samples to the audio device |
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the number of samples queued in the device |
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unblock a read to the device and reset. |