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;
}