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/*! \file audio.hch
*
* \section generic Graphic Equalizer API
*
* \section project Project information.
* Project Graphic Equalizer\n
* \author O.M. Schinagl
* \date 20041021
* \version 0.1
*
* \section copyright Copyright
* Copyright ©2004 Koninklijke Philips Electronics N.V. All rights reserved
*
* \section history Change history
* 20041021: O.M. Schinagl\n Initial version
*
********************************************************************/
#ifndef _AUDIO_HCH
#define _AUDIO_HCH 1
/*
* Type definition of the shared memory to be used in various processes
*/
typedef struct {
mpram {
ram unsigned 7 write[256];
rom unsigned 7 read[256];
} fft_info with { block = "BlockRAM"};
mpram {
ram unsigned 6 write[256];
rom unsigned 6 read[256];
} ifft_info with { block = "BlockRAM"};
unsigned 4 *equalizer_levels_ptr;
unsigned 1 display_log;
unsigned 1 saturated;
unsigned 1 play;
} audiodata_t;
/*
* States used to indicate wether audio data is sampled.
*/
#define AUDIO_NOT_READY 0
#define AUDIO_READY 1
/*
* Line in or Mic in aliases for audio_init.
*/
#define LINE_IN RC200AudioInLineIn
#define MIC_IN RC200AudioInMicrophone
/*
* Sample Rate Aliases for audio_init.
*/
#define SR_8000 RC200AudioSampleRate8000
#define SR_11025 RC200AudioSampleRate11025
#define SR_16000 RC200AudioSampleRate16000
#define SR_22050 RC200AudioSampleRate22050
#define SR_44100 RC200AudioSampleRate44100
#define SR_48000 RC200AudioSampleRate48000
/*
* Convert microseconds to something our code understands.
*/
#define AUDIOINITDELAY ((PAL_ACTUAL_CLOCK_RATE *AUDIOINIT_MICROSECONDS) /1000000)
/*
* Initialize the Audio sub-system. Input_source chooses between line in or mic
* in. The sample_rate is set to supplied rate. Defines for these are mentioned
* above.
*/
macro proc audio_init(input_source, sample_rate, AUDIOIN, AUDIOOUT);
/*
* Main audiodriver loop. This procedure never returns! It handles audio io and
* updates the shared memory. It needs Audio I/O handlers passed.
*/
macro proc audio_main(audiodata, AUDIOIN, AUDIOOUT);
/*
* FFT loop, waits until 64 samples are read from the audio input
* before switching the pointers needed for double and quadruple buffering, after that
* sequentially calling the perform_fft, equalize_audio and perform_ifft functions.
*/
macro proc run_fft(audiodata);
/*
* Sampling loop, fills the audio input and output arrays and uses FFT_Sync
* to notify the FFT when 64 samples are read from the audio input.
*/
macro proc sample_audio(audiodata, AUDIOOIN);
/*
* Audio output loop, writes the modified audio samples to the audio output.
*/
macro proc output_audio(AUDIOOUT);
#else
#error "ERROR file audio.hch multiple times included"
#endif /* --- _AUDIO_HCH --- */
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