audio/mic/source/main.c

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <malloc.h>
#include <3ds.h>
 
int main()
{
    gfxInitDefault();
    consoleInit(GFX_BOTTOM, NULL);
 
    bool initialized = true;
 
    u32 micbuf_size = 0x30000;
    u32 micbuf_pos = 0;
    u8* micbuf = memalign(0x1000, micbuf_size);
 
    printf("Initializing CSND...\n");
    if(R_FAILED(csndInit()))
    {
        initialized = false;
        printf("Could not initialize CSND.\n");
    } else printf("CSND initialized.\n");
 
    printf("Initializing MIC...\n");
    if(R_FAILED(micInit(micbuf, micbuf_size)))
    {
        initialized = false;
        printf("Could not initialize MIC.\n");
    } else printf("MIC initialized.\n");
 
    u32 micbuf_datasize = micGetSampleDataSize();
 
    u32 audiobuf_size = 0x100000;
    u32 audiobuf_pos = 0;
    u8* audiobuf = linearAlloc(audiobuf_size);
 
    if(initialized) printf("Hold A to record, release to play.\n");
    printf("Press START to exit.\n");
 
    while(aptMainLoop())
    {
        hidScanInput();
        gspWaitForVBlank();
 
        u32 kDown = hidKeysDown();
        if (kDown & KEY_START)
            break; // break in order to return to hbmenu
 
        if(initialized)
        {
            if(kDown & KEY_A)
            {
                audiobuf_pos = 0;
                micbuf_pos = 0;
 
                printf("Stopping audio playback...\n");
                CSND_SetPlayState(0x8, 0);
                if(R_FAILED(CSND_UpdateInfo(0))) printf("Failed to stop audio playback.\n");
 
                printf("Starting sampling...\n");
                if(R_SUCCEEDED(MICU_StartSampling(MICU_ENCODING_PCM16_SIGNED, MICU_SAMPLE_RATE_16360, 0, micbuf_datasize, true))) printf("Now recording.\n");
                else printf("Failed to start sampling.\n");
            }
 
            if((hidKeysHeld() & KEY_A) && audiobuf_pos < audiobuf_size)
            {
                u32 micbuf_readpos = micbuf_pos;
                micbuf_pos = micGetLastSampleOffset();
                while(audiobuf_pos < audiobuf_size && micbuf_readpos != micbuf_pos)
                {
                    audiobuf[audiobuf_pos] = micbuf[micbuf_readpos];
                    audiobuf_pos++;
                    micbuf_readpos = (micbuf_readpos + 1) % micbuf_datasize;
                }
            }
 
            if(hidKeysUp() & KEY_A)
            {
                printf("Stoping sampling...\n");
                if(R_FAILED(MICU_StopSampling())) printf("Failed to stop sampling.\n");
 
                printf("Starting audio playback...\n");
                if(R_SUCCEEDED(GSPGPU_FlushDataCache(audiobuf, audiobuf_pos)) && R_SUCCEEDED(csndPlaySound(0x8, SOUND_ONE_SHOT | SOUND_FORMAT_16BIT, 16360, 1.0, 0.0, (u32*)audiobuf, NULL, audiobuf_pos))) printf("Now playing.\n");
                else printf("Failed to start playback.\n");
            }
        }
 
        gfxFlushBuffers();
        gfxSwapBuffers();
    }
 
    linearFree(audiobuf);
 
    micExit();
    free(micbuf);
 
    csndExit();
    gfxExit();
    return 0;
}