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AudioCodec Class Reference

The codec class is a virtual used for transcoding audio samples between linear frames (or other known format) and an encoded "sample" buffer. process codec interface. More...

#include <audio.h>

Inheritance diagram for AudioCodec:

List of all members.

Public Methods
virtual void	Encode (unsigned short *buffer, unsigned samples=0, int channel=0)=0
	Encode a linear sample frame into the codec sample buffer. More...
virtual unsigned	Decode (unsigned short *buffer, int channel=0)=0
	Decode the sample frame into linear samples. More...
virtual unsigned	Load (unsigned char *data, unsigned length)
	Load a codec from a byte stream data source. More...
virtual unsigned	Save (unsigned char *data, unsigned length)
	Save a codec to a byte stream data source. More...
unsigned	getLength (void)
	Get current number of samples of data, based on load or encode. More...
unsigned	getFrameSize (void)
	Get size of the audio frame.
virtual unsigned	getChannels (void)
	Check if stereo/multi-channel codec.
Protected Methods
	AudioCodec (unsigned frames, audioencoding_t encoding, unsigned rate)
Protected Attributes
unsigned	length

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Detailed Description

The codec class is a virtual used for transcoding audio samples between linear frames (or other known format) and an encoded "sample" buffer. process codec interface.

This class is only abstract and describes the core interface for loadable codec modules. This class is normally merged with AudioSample. A derived AudioCodecXXX will typically include a AudioRegisterXXX static class to automatically initialize and register the codec with the codec registry.

Author(s):

David Sugar <dyfet@ostel.com>

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Constructor & Destructor Documentation

AudioCodec::AudioCodec ( unsigned frames, audioencoding_t encoding, unsigned rate ) [protected]

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Member Function Documentation

unsigned AudioCodec::Decode ( unsigned short * buffer, int channel = 0 ) [pure virtual]

Decode the sample frame into linear samples. Returns: number of samples extracted. Parameters: sample   buffer to save linear samples into. channel   number or 0 for all channels.

void AudioCodec::Encode ( unsigned short * buffer, unsigned samples = 0, int channel = 0 ) [pure virtual]

Encode a linear sample frame into the codec sample buffer. Parameters: linear   sample buffer to encode. number   of samples, or use default count. channel   number or 0 for all channels.

unsigned AudioCodec::Load ( unsigned char * data, unsigned length ) [virtual]

Load a codec from a byte stream data source. This is used for streaming of compressed codec's where frames are of irregular sizes. Returns: number of bytes actually read into codec workspace. Parameters: pointer   to byte data stream. number   of data bytes.

unsigned AudioCodec::Save ( unsigned char * data, unsigned length ) [virtual]

Save a codec to a byte stream data source. This is used for streaming of compressed codec's where frames are of irregular sizes. Returns: number of bytes actually written to workspace. Parameters: pointer   to byte data stream. size   of byte data stream.

unsigned AudioCodec::getChannels ( void ) [virtual]

Check if stereo/multi-channel codec.

unsigned AudioCodec::getFrameSize ( void )

Get size of the audio frame.

unsigned AudioCodec::getLength ( void ) [inline]

Get current number of samples of data, based on load or encode. Returns: length.

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Member Data Documentation

unsigned AudioCodec::length [protected]

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The documentation for this class was generated from the following file:

• audio.h

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