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#include <nds.h>
#include <stdio.h>

//the record sample rate
#define sample_rate  8000

//buffer to hold sound data for playback
u16* sound_buffer = 0;

//buffer which is written to by the arm7
u16* mic_buffer = 0;

//the length of the current data
u32 data_length = 0;

//enough hold 5 seconds of 16bit audio
u32 sound_buffer_size = sample_rate * 2 * 5;

//the mic buffer sent to the arm7 is a double buffer
//every time it is half full the arm7 signals us so we can read the
//data.  I want the buffer to swap about once per frame so i chose a
//buffer size large enough to hold two frames of 16bit mic data
u32 mic_buffer_size = sample_rate * 2 / 30;

//------ live ------
void live_micHandler(void* data, int length)
{
        if(!sound_buffer || data_length > sound_buffer_size) return;
        DC_InvalidateRange(data, length);
        dmaCopy(data, ((u8*)sound_buffer) + data_length, length);
        iprintf("+");
        soundPlaySample(sound_buffer, SoundFormat_16Bit, length, sample_rate, 127, 64, false, 0);
}

void live_start()
{
	data_length = 0;
	soundEnable();
	soundMicRecord(mic_buffer, mic_buffer_size, MicFormat_12Bit, sample_rate, live_micHandler);
}

void live_stop()
{
	soundMicOff();
}

//----------------------------

int main(void) 
{
	int key;
	bool recording = false;

	sound_buffer = (u16*)malloc(sound_buffer_size);
	mic_buffer = (u16*)malloc(mic_buffer_size);

	consoleDemoInit();

	iprintf("Press B for live streaming\n");

	while(1) 
	{
		scanKeys();
		key = keysDown();
		
		if(key & KEY_B)
		{
			recording ? live_stop() : live_start();
			recording = !recording;
			iprintf("LIVE %s\n", recording ? "start" : "stop");
		}

		swiWaitForVBlank();

	}
}