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/*
Copyright 2016-2023 melonDS team
This file is part of melonDS.
melonDS is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option)
any later version.
melonDS is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with melonDS. If not, see http://www.gnu.org/licenses/.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "FrontendUtil.h"
#include "NDS.h"
#include "mic_blow.h"
using namespace melonDS;
namespace Frontend
{
int AudioOut_Freq;
float AudioOut_SampleFrac;
s16* MicBuffer;
u32 MicBufferLength;
u32 MicBufferReadPos;
void Init_Audio(int outputfreq)
{
AudioOut_Freq = outputfreq;
AudioOut_SampleFrac = 0;
MicBuffer = nullptr;
MicBufferLength = 0;
MicBufferReadPos = 0;
}
int AudioOut_GetNumSamples(int outlen)
{
float f_len_in = (outlen * 32823.6328125) / (float)AudioOut_Freq;
f_len_in += AudioOut_SampleFrac;
int len_in = (int)floor(f_len_in);
AudioOut_SampleFrac = f_len_in - len_in;
return len_in;
}
void AudioOut_Resample(s16* inbuf, int inlen, s16* outbuf, int outlen, int volume)
{
double factor = (double) inlen / (double) outlen;
double inpos = -(factor / 2);
double vol = (double) volume / 256.f;
for (int i = 0; i < outlen * 2; i += 2)
{
double intpart_d;
double frac = modf(inpos, &intpart_d);
int intpart = (int) intpart_d;
double l1 = inbuf[ intpart * 2];
double l2 = inbuf[(intpart * 2) + 2];
double r1 = inbuf[(intpart * 2) + 1];
double r2 = inbuf[(intpart * 2) + 3];
double ldiff = l2 - l1;
double rdiff = r2 - r1;
outbuf[i] = (s16) round((l1 + ldiff * frac) * vol);
outbuf[i+1] = (s16) round((r1 + rdiff * frac) * vol);
inpos += factor;
}
}
void Mic_FeedSilence(NDS& nds)
{
MicBufferReadPos = 0;
nds.MicInputFrame(NULL, 0);
}
void Mic_FeedNoise(NDS& nds)
{
int sample_len = sizeof(mic_blow) / sizeof(u16);
static int sample_pos = 0;
s16 tmp[735];
for (int i = 0; i < 735; i++)
{
tmp[i] = mic_blow[sample_pos];
sample_pos++;
if (sample_pos >= sample_len) sample_pos = 0;
}
nds.MicInputFrame(tmp, 735);
}
void Mic_FeedExternalBuffer(NDS& nds)
{
if (!MicBuffer) return Mic_FeedSilence(nds);
if ((MicBufferReadPos + 735) > MicBufferLength)
{
s16 tmp[735];
u32 len1 = MicBufferLength - MicBufferReadPos;
memcpy(&tmp[0], &MicBuffer[MicBufferReadPos], len1*sizeof(s16));
memcpy(&tmp[len1], &MicBuffer[0], (735 - len1)*sizeof(s16));
nds.MicInputFrame(tmp, 735);
MicBufferReadPos = 735 - len1;
}
else
{
nds.MicInputFrame(&MicBuffer[MicBufferReadPos], 735);
MicBufferReadPos += 735;
}
}
void Mic_SetExternalBuffer(s16* buffer, u32 len)
{
MicBuffer = buffer;
MicBufferLength = len;
MicBufferReadPos = 0;
}
}
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