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diff --git a/util/audio.cpp b/util/audio.cpp
index 241fb907..5d681b27 100644
--- a/util/audio.cpp
+++ b/util/audio.cpp
@@ -1,151 +1,153 @@
+#include <string.h>
+
#include "audio.h"
#include "debug.h"
namespace Util{
#ifdef USE_SDL1
AudioConverter::AudioConverter(Encoding inputEncoding, int inputChannels, int inputFrequency,
Encoding outputEncoding, int outputChannels, int outputFrequency){
SDL_BuildAudioCVT(&conversion, inputEncoding, inputChannels, inputFrequency,
outputEncoding, outputChannels, outputFrequency);
}
AudioConverter::~AudioConverter(){
}
int AudioConverter::convertedLength(int length){
return length;
}
int AudioConverter::convert(void * input, int length){
if (conversion.needed){
conversion.buf = (Uint8*) input;
conversion.len = length;
/* then convert to whatever the real output wants */
SDL_ConvertAudio(&conversion);
return conversion.len_cvt;
} else {
return length;
}
}
#else
AudioConverter::AudioConverter(Encoding inputEncoding, int inputChannels, int inputFrequency,
Encoding outputEncoding, int outputChannels, int outputFrequency){
input.bytes = inputEncoding;
input.channels = inputChannels;
input.frequency = inputFrequency;
output.bytes = outputEncoding;
output.channels = outputChannels;
output.frequency = outputFrequency;
sizeRatio = (double) byteSize(output) * output.frequency / ((double) byteSize(input) * input.frequency);
}
int AudioConverter::byteSize(const Format & what){
return encodingBytes(what.bytes) * what.channels;
}
/* how many bytes an encoding takes up */
int AudioConverter::encodingBytes(Encoding what){
switch (what){
case Signed16: return 2;
}
return 1;
}
int AudioConverter::convertedLength(int length){
return length * sizeRatio;
}
double CubicInterpolate(double y0,double y1,
double y2,double y3,
double mu){
double a0,a1,a2,a3,mu2;
mu2 = mu*mu;
a0 = y3 - y2 - y0 + y1;
a1 = y0 - y1 - a0;
a2 = y2 - y0;
a3 = y1;
return (a0*mu*mu2+a1*mu2+a2*mu+a3);
}
template <class Size>
Size clamp(double input){
Size top = (1 << (sizeof(Size) * 8 - 1)) - 1;
Size bottom = -(1 << (sizeof(Size) * 8 - 1));
if (input > top){
return top;
}
if (input < bottom){
return bottom;
}
return input;
}
template <class Size>
void doConvertStereo(Size * input, Size * buffer, int length, double ratio){
int maximum = length * ratio;
for (int sample = 0; sample < maximum; sample += 1){
double inputSample = sample / ratio;
for (int channel = 0; channel < 2; channel += 1){
int sample0 = ((int) inputSample - 1) * 2 + channel;
int sample1 = ((int) inputSample + 0) * 2 + channel;
int sample2 = ((int) inputSample + 1) * 2 + channel;
int sample3 = ((int) inputSample + 2) * 2 + channel;
if (sample0 < 0){
sample0 = sample1;
}
if (sample2 >= length * 2){
sample2 = sample1;
}
if (sample3 >= length * 2){
sample3 = sample2;
}
buffer[sample * 2 + channel] = clamp<Size>(CubicInterpolate(input[sample0], input[sample1], input[sample2], input[sample3], inputSample - (int) inputSample));
// Global::debug(0) << "Input[" << sample << "] " << channel << ": " << input[sample1] << " Output: " << buffer[sample * 2 + channel] << std::endl;
}
}
}
int AudioConverter::convert(void * input, int length){
/* no conversion needed */
if (this->input == this->output){
return length;
}
int total = convertedLength(length);
char * buffer = new char[total];
switch (this->input.bytes){
case Signed16: doConvertStereo<signed short>((signed short*) input, (signed short*) buffer, length / 4, sizeRatio); break;
}
memcpy(input, buffer, total);
delete[] buffer;
return total;
}
AudioConverter::~AudioConverter(){
}
bool AudioConverter::Format::operator==(const AudioConverter::Format & him) const {
return this->bytes == him.bytes &&
this->channels == him.channels &&
this->frequency == him.frequency;
}
#endif
}

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