audio.hch File Reference

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Data Structures
struct	audiodata_t
Defines
#define	_AUDIO_HCH   1
#define	AUDIO_NOT_READY   0
#define	AUDIO_READY   1
#define	LINE_IN   RC200AudioInLineIn
#define	MIC_IN   RC200AudioInMicrophone
#define	SR_8000   RC200AudioSampleRate8000
#define	SR_11025   RC200AudioSampleRate11025
#define	SR_16000   RC200AudioSampleRate16000
#define	SR_22050   RC200AudioSampleRate22050
#define	SR_44100   RC200AudioSampleRate44100
#define	SR_48000   RC200AudioSampleRate48000
Functions
macro proc	audio_init (gain_level, input_source, sample_rate, AUDIOIN, AUDIOOUT)
	Set some inital values to the audio hardware.
macro proc	audio_main (audiodata, AUDIOIN, AUDIOOUT)
	Main audiodriver. This function never returns! It calls the audiohandlers and stores samples into a global array. Once 64 Samples are collected it raises a signal AUDIO_READY to let other processes know it's ready. We use quadruple buffering for audio input and double buffering for audio output.

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Detailed Description

Graphic Equalizer API

Project information.

Project Graphic Equalizer

Author:

O.M. Schinagl

Date:

20041021

Version:

0.1

Copyright

Copyright ©2004 Koninklijke Philips Electronics N.V. All rights reserved

Change history

20041021: O.M. Schinagl
Initial version

Definition in file audio.hch.

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Define Documentation

#define _AUDIO_HCH   1

Definition at line 20 of file audio.hch.

#define AUDIO_NOT_READY   0

Definition at line 44 of file audio.hch.

#define AUDIO_READY   1

Definition at line 45 of file audio.hch.

#define LINE_IN   RC200AudioInLineIn

Definition at line 52 of file audio.hch. Referenced by main().

#define MIC_IN   RC200AudioInMicrophone

Definition at line 53 of file audio.hch.

#define SR_8000   RC200AudioSampleRate8000

Definition at line 60 of file audio.hch.

#define SR_11025   RC200AudioSampleRate11025

Definition at line 61 of file audio.hch.

#define SR_16000   RC200AudioSampleRate16000

Definition at line 62 of file audio.hch.

#define SR_22050   RC200AudioSampleRate22050

Definition at line 63 of file audio.hch.

#define SR_44100   RC200AudioSampleRate44100

Definition at line 64 of file audio.hch. Referenced by main().

#define SR_48000   RC200AudioSampleRate48000

Definition at line 65 of file audio.hch.

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Function Documentation

macro proc audio_init (  gain_level  , input_source  , sample_rate  , AUDIOIN  , AUDIOOUT  )

Set some inital values to the audio hardware. Parameters: gain_level  Set the input amplifier to this amplification level. input_source  Choose between microphone input or linein input. sample_rate  Set the sample rate between 8000 and 48000 Returns: void Return values: void  Definition at line 45 of file audio.hcc. Referenced by main().

macro proc audio_main (  audiodata  , AUDIOIN  , AUDIOOUT  )

Main audiodriver. This function never returns! It calls the audiohandlers and stores samples into a global array. Once 64 Samples are collected it raises a signal AUDIO_READY to let other processes know it's ready. We use quadruple buffering for audio input and double buffering for audio output. Parameters: *audiodata  pointer to audio information structure. AUDIOIN  Audio Input Handler AUDIOOUT  Audio Output Handler Returns: Never Returns. Return values: void  Definition at line 76 of file audio.hcc. Referenced by main().

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