audio/maxmod/audio_modes/source/main.c

/***********************************************
 * this example demonstrates the 3 audio modes
 *
 * functions used:
 *   mmInitDefaultMem(soundbank)
 *     Initialize with default settings
 *
 *   mmLoad( module )
 *     Loads a module to be played
 *
 *   mmStart( module )
 *     Starts playback of a module
 *
 *   mmStop()
 *     Stops module playback
 *
 *   mmSelectMode( mode )
 *     Selects the audio mode
 *     modes:
 *       0: MM_MODE_A, hardware audio mode
 *       1: MM_MODE_B, interpolated audio mode
 *       2: MM_MODE_C, extended audio mode
 *********************************************************/
 
#include <nds.h>
#include <maxmod9.h>

#include <stdio.h>

#include "soundbank_bin.h"
#include "soundbank.h"

//---------------------------------------------
const char *SHOW_TEXT = "\n"

"   Maxmod Audio Modes Example\n\n"

" Song: \n"
" Mode: \n\n"

" Left/Right: Select Song\n"
" Up/Down: Change Audio Mode\n"
" A: Start Playback\n"
" B: Stop Playback\n\n"

" Tip: Play subtonal with the\n"
" extended mode or else it won't\n"
" sound right.\n\n"

" Another Tip: The interpolated\n"
" mode doesn't work in current\n"
" emulators.";
//---------------------------------------------

void print_song( int song );
void print_mode( int mode );

// song order
const short song_order[] = { MOD_KEYG_SUBTONAL, MOD_REZ_MONDAY, MOD_PURPLE_MOTION_INSPIRATION };

// rez-monday.mod is a bit loud, so we will lower the volume to 500 (normal volume is 1024)
const short song_volumes[] = { 1024, 500, 1024 };

// strings for the "Song: " display
const char *song_titles[] = { 
    "subtonal (30ch)  ",
    "monday (14ch)    ",
    "inspiration (4ch)"
};

// strings for the "Mode: " display
const char *audiomode_names[] = {
    "A - Hardware (16ch)    ",
    "B - Interpolated (16ch)",
    "C - Extended (30ch)    "
};

//---------------------------------------------------------------------------------
// program entry point
//---------------------------------------------------------------------------------
int main(void) {
//---------------------------------------------------------------------------------
    
    //---------------------------------------------------------
    // setup console
    //---------------------------------------------------------
    consoleDemoInit();
    
    // set a dark blue backdrop
    BG_PALETTE_SUB[0] = RGB15( 0, 0, 10 );
    
    //---------------------------------------------------------
    // init maxmod with default settings
    //---------------------------------------------------------
    mmInitDefaultMem( (mm_addr)soundbank_bin );
    
    //---------------------------------------------------------
    // load songs (must be loaded before using with mmStart)
    //---------------------------------------------------------
    mmLoad( MOD_KEYG_SUBTONAL );
    mmLoad( MOD_REZ_MONDAY );
    mmLoad( MOD_PURPLE_MOTION_INSPIRATION );
    
    int song = 0;
    int mode = 0;
    
    //---------------------------------------------------------
    // display screen info
    //---------------------------------------------------------
    iprintf( SHOW_TEXT );
    print_song( song );
    print_mode( mode );
    
    //---------------------------------------------------------
    // main loop
    //---------------------------------------------------------
    while(1)
    {
        //-----------------------------------------------------
        // get new keypad input
        //-----------------------------------------------------
        scanKeys();
        int keys = keysDown();
        
        //-----------------------------------------------------
        // LEFT: select previous song
        //-----------------------------------------------------
        if( keys & KEY_LEFT )
        {
            song--;
            if( song < 0 ) song = 2;
            print_song( song );
        }
        
        //-----------------------------------------------------
        // RIGHT: select next song
        //-----------------------------------------------------
        if( keys & KEY_RIGHT )
        {
            song++;
            if( song > 2 ) song = 0;
            print_song( song );
        }
        
        //-----------------------------------------------------
        // A: start song
        //-----------------------------------------------------
        if( keys & KEY_A )
        {
            mmSetModuleVolume( song_volumes[song] );
            
            // loop module until stopped with B keypress
            mmStart( song_order[song], MM_PLAY_LOOP );
        }
        
        //-----------------------------------------------------
        // B: stop song
        //-----------------------------------------------------
        if( keys & KEY_B )
        {
            mmStop();
        }
    
        //-----------------------------------------------------
        // UP: next audio mode
        //-----------------------------------------------------
        if( keys & KEY_UP )
        {
            mode++;
            if( mode > 2 ) mode = 0;
            print_mode( mode );
            
            // switch audio mode
            mmSelectMode( mode );
        }
        
        //-----------------------------------------------------
        // DOWN: previous audio mode
        //-----------------------------------------------------
        if( keys & KEY_DOWN )
        {
            mode--;
            if( mode < 0 ) mode = 2;
            print_mode( mode );
            
            // switch audio mode
            mmSelectMode( mode );
        }
        
        //-----------------------------------------------------
        // wait until next frame
        //-----------------------------------------------------
        swiWaitForVBlank();
    }
    
    return 0;
}

//---------------------------------------------------------------------------------
// print song title
//---------------------------------------------------------------------------------
void print_song( int song ) {
//---------------------------------------------------------------------------------
    iprintf("\x1b[3;7H%s", song_titles[song] );
}

//---------------------------------------------------------------------------------
// print audio mode
//---------------------------------------------------------------------------------
void print_mode( int mode ) {
//---------------------------------------------------------------------------------
    iprintf("\x1b[4;7H%s", audiomode_names[mode] );
}