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/*! \file runfft.hcc
*
* \section generic This module will handle the audio I/O. It will ensure the
* audiosamples are correctly buffered and fed correctly to the FFT.\n
* This module will also handle the output of the modified audio samples.
*
* \section project Project information.
* Project Graphic Equalizer\n
* \author M. Lauwerijssen
* \date 20041110
* \version 0.1
*
* \section copyright Copyright
* Copyright ©2004 Koninklijke Philips Electronics N.V. All rights reserved
*
* \section history Change history
* 20041110: M. Lauwerijssen\n Initial version
*
********************************************************************/
#include <stdlib.hch>
#include "pal_master.hch"
#include "configuration.hch"
#if USE_RUNFFT
#include "audio.hch"
#include "fft.hch"
#if HAVE_DEBUG
#include "debug.hch"
#endif
/*
* Forward declarations
*/
static macro expr ClockRate = PAL_ACTUAL_CLOCK_RATE;
#if HARDWARE_MULTIPLY
//input buffer
ram signed 18 audio_buffer_in[256] with { block = "BlockRAM"};
//output buffer
ram signed 18 audio_buffer_out[128] with { block = "BlockRAM"};
#else
//input buffer
ram signed 16 audio_buffer_in[256] with { block = "BlockRAM"};
//output buffer
ram signed 16 audio_buffer_out[128] with { block = "BlockRAM"};
#endif
//EQ settings for the FFT
ram unsigned 4 EQ_info[128] with { block = "BlockRAM"};
//EQ settings received from the display
#if HARDWARE_MULTIPLY
signed 18 *audioptr_in1,*audioptr_in2,*audioptr_in3,*audioptr_in4;
signed 18 *audioptr_out1,*audioptr_out2;
unsigned 6 *displayptr1,*displayptr2,*displayptr3,*displayptr4;
#else
signed 16 *audioptr_in1,*audioptr_in2,*audioptr_in3,*audioptr_in4;
signed 16 *audioptr_out1,*audioptr_out2;
unsigned 6 *displayptr1,*displayptr2,*displayptr3,*displayptr4;
#endif
/*! \fn macro proc audio_main(AUDIOIN, AUDIOOUT);
* \brief Audio I/O component main.
*
* \param audiodata Pointer to audiodata struct
* \param AUDIOIN Handle to audio-input
* \param AUDIOOUT Handle to audio-output
*
* \return Never Returns.
* \retval void
*/
macro proc audio_main(audiodata, AUDIOIN, AUDIOOUT)
{
signed 18 sample;
unsigned 6 sample_count;
unsigned 8 i,cycle;
unsigned 4 eqinfo;
unsigned 1 FFT_Sync, first;
macro expr OW = PalAudioOutGetMaxDataWidthCT ();
macro expr IW = PalAudioInGetMaxDataWidthCT ();
signed LeftNew, RightNew;
signed Output_sample;
ram unsigned 6 input[64];
//pointers for double and quadruple buffering:
audioptr_in1 = &audio_buffer_in[0];
audioptr_in2 = &audio_buffer_in[64];
audioptr_in3 = &audio_buffer_in[128];
audioptr_in4 = &audio_buffer_in[192];
audioptr_out1 = &audio_buffer_out[0];
audioptr_out2 = &audio_buffer_out[64];
displayptr1 = &audiodata.ifft_info.write[0];
displayptr2 = &audiodata.ifft_info.write[64];
displayptr3 = &audiodata.ifft_info.write[128];
displayptr4 = &audiodata.ifft_info.write[192];
FFT_Sync=0;
par
{
/*
* 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.
*/
for(;;)
{
if (FFT_Sync) //if 64 samples are read from ADC...
{
par
{
// switch pointers
audioptr_in1 = audioptr_in2;
audioptr_in2 = audioptr_in3;
audioptr_in3 = audioptr_in4;
audioptr_in4 = audioptr_in1;
audioptr_out1 = audioptr_out2;
audioptr_out2 = audioptr_out1;
displayptr1=displayptr2;
displayptr2=displayptr3;
displayptr3=displayptr4;
displayptr4=displayptr1;
FFT_Sync = 0;
}
// FFT calculation
perform_fft(audioptr_in1);
#if PERFORM_FFT_CALCULATION
equalize_audio(&audiodata);
#endif
// inverse FFT calculation
perform_ifft(audioptr_out1,displayptr1);
}
else
delay;
}
/*
* 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.
*/
for(sample_count=0;;)//store the samples in the inputbuffer
{
if (!FFT_Sync)
{
par
{
seq
{
PalAudioInRead(AUDIOIN, &LeftNew, &RightNew);
#if HARDWARE_MULTIPLY
audioptr_in1[sample_count] = LeftNew;
#else
audioptr_in1[sample_count] = (LeftNew\\2);//drop 2 LSB's
#endif
sample_count++;
if (!sample_count)
{
FFT_Sync = 1;
}
}
seq
{
Output_sample = audioptr_out2[sample_count];
}
}
}
else
{
delay;
}
}
/*
* Audio output loop, writes the modified audio samples to the audio output.
*/
for(;;)
{
PalAudioOutWrite(AUDIOOUT,(signed OW)(Output_sample @ 0),(signed OW)(Output_sample @ 0));
}
}//end par
}// end function
#endif
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