Graphic Equalizer 2: C:/Project Marcel & Oliver/Graphic_Equalizer/include/fft.hch Source File

00001 #define NUMBER_OF_COLUMNS       8
00002 #define NUMBER_OF_POINTS        (1<<NUMBER_OF_COLUMNS)
00003 #define NUMBER_OF_FREQUENCIES   (NUMBER_OF_POINTS>>1)
00004 
00005 #if HARDWARE_MULTIPLY
00006 /*
00007  * This routine obtains the audio data from the audio I/O component and copies this  
00008  * data to local arrays for calculating purposes, and calls the FFT algorithm.
00009 */
00010 void perform_fft(signed 18 *pcm_audio);
00011 
00012 /* This routine calls the ifft algorithm and after completing that it obtains the 
00013  * modified audio data and copies that to the output arrays of the audio I/O component. 
00014  * Besides that it also fills the array used by the display routine for displaying the waveform.
00015 */
00016 void perform_ifft(signed 18 *modified_audio ,unsigned 6 *ifft_info);
00017 #else
00018 /*
00019  * This routine obtains the audio data from the audio I/O component and copies this  
00020  * data to local arrays for calculating purposes, and calls the FFT algorithm.
00021 */
00022 void perform_fft(signed 16 *pcm_audio);
00023 
00024 /* This routine calls the ifft algorithm and after completing that it obtains the 
00025  * modified audio data and copies that to the output arrays of the audio I/O component. 
00026  * Besides that it also fills the array used by the display routine for displaying the waveform.
00027 */
00028 void perform_ifft(signed 16 *modified_audio ,unsigned 6 *ifft_info);
00029 #endif
00030 
00031 /* This routine equalizes the frequencies derived by the FFT calculation, 
00032  * according to the settings of the equalizer bars.
00033 */
00034 void equalize_audio(audiodata_t *audiodata);