ref: d6888040a2db4065a2550c147f754258e8ac0a5c
dir: /src/Sound.cpp/
// Some of the original source code for this file can be found here:
// https://github.com/shbow/organya/blob/master/source/Sound.cpp
#include "Sound.h"
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "SDL.h"
#include "WindowsWrapper.h"
#include "Organya.h"
#include "PixTone.h"
#define FREQUENCY 44100
#ifdef RASPBERRY_PI
#define STREAM_SIZE 0x400 // Larger buffer to prevent stutter
#else
#define STREAM_SIZE 0x100 // FREQUENCY/200 rounded to the nearest power of 2 (SDL2 *needs* a power-of-2 buffer size)
#endif
#define clamp(x, y, z) (((x) > (z)) ? (z) : ((x) < (y)) ? (y) : (x))
//Audio device
SDL_AudioDeviceID audioDevice;
//Keep track of all existing sound buffers
SOUNDBUFFER *soundBuffers;
//Sound buffer code
SOUNDBUFFER::SOUNDBUFFER(size_t bufSize)
{
//Lock audio buffer
SDL_LockAudioDevice(audioDevice);
//Set parameters
size = bufSize;
playing = false;
looping = false;
looped = false;
frequency = 0.0;
volume = 1.0;
volume_l = 1.0;
volume_r = 1.0;
samplePosition = 0.0;
//Create waveform buffer
data = new unsigned char[bufSize];
memset(data, 0x80, bufSize);
//Add to buffer list
this->next = soundBuffers;
soundBuffers = this;
//Unlock audio buffer
SDL_UnlockAudioDevice(audioDevice);
}
SOUNDBUFFER::~SOUNDBUFFER()
{
//Lock audio buffer
SDL_LockAudioDevice(audioDevice);
//Free buffer
if (data)
delete[] data;
//Remove from buffer list
for (SOUNDBUFFER **soundBuffer = &soundBuffers; *soundBuffer != NULL; soundBuffer = &(*soundBuffer)->next)
{
if (*soundBuffer == this)
{
*soundBuffer = this->next;
break;
}
}
//Unlock audio buffer
SDL_UnlockAudioDevice(audioDevice);
}
void SOUNDBUFFER::Release()
{
//TODO: find a better and more stable(?) way to handle this function
delete this;
}
void SOUNDBUFFER::Lock(unsigned char **outBuffer, size_t *outSize)
{
SDL_LockAudioDevice(audioDevice);
if (outBuffer != NULL)
*outBuffer = data;
if (outSize != NULL)
*outSize = size;
}
void SOUNDBUFFER::Unlock()
{
SDL_UnlockAudioDevice(audioDevice);
}
void SOUNDBUFFER::SetCurrentPosition(unsigned long dwNewPosition)
{
SDL_LockAudioDevice(audioDevice);
samplePosition = dwNewPosition;
SDL_UnlockAudioDevice(audioDevice);
}
void SOUNDBUFFER::SetFrequency(unsigned long dwFrequency)
{
SDL_LockAudioDevice(audioDevice);
frequency = (double)dwFrequency;
SDL_UnlockAudioDevice(audioDevice);
}
float MillibelToVolume(long lVolume)
{
//Volume is in hundredths of decibels, from 0 to -10000
lVolume = clamp(lVolume, (long)-10000, (long)0);
return (float)pow(10.0, lVolume / 2000.0);
}
void SOUNDBUFFER::SetVolume(long lVolume)
{
SDL_LockAudioDevice(audioDevice);
volume = MillibelToVolume(lVolume);
SDL_UnlockAudioDevice(audioDevice);
}
void SOUNDBUFFER::SetPan(long lPan)
{
SDL_LockAudioDevice(audioDevice);
volume_l = MillibelToVolume(-lPan);
volume_r = MillibelToVolume(lPan);
SDL_UnlockAudioDevice(audioDevice);
}
void SOUNDBUFFER::Play(bool bLooping)
{
SDL_LockAudioDevice(audioDevice);
playing = true;
looping = bLooping;
SDL_UnlockAudioDevice(audioDevice);
}
void SOUNDBUFFER::Stop()
{
SDL_LockAudioDevice(audioDevice);
playing = false;
SDL_UnlockAudioDevice(audioDevice);
}
void SOUNDBUFFER::Mix(float *buffer, size_t frames)
{
if (!playing) //This sound buffer isn't playing
return;
for (size_t i = 0; i < frames; ++i)
{
const double freqPosition = frequency / FREQUENCY; //This is added to position at the end
//Get the in-between sample this is (linear interpolation)
const float sample1 = ((looped || ((size_t)samplePosition) >= 1) ? data[(size_t)samplePosition] : 128.0f);
const float sample2 = ((looping || (((size_t)samplePosition) + 1) < size) ? data[(((size_t)samplePosition) + 1) % size] : 128.0f);
//Interpolate sample
const float subPos = (float)fmod(samplePosition, 1.0);
const float sampleA = sample1 + (sample2 - sample1) * subPos;
//Convert sample to float32
const float sampleConvert = (sampleA - 128.0f) / 128.0f;
//Mix
*buffer++ += (float)(sampleConvert * volume * volume_l);
*buffer++ += (float)(sampleConvert * volume * volume_r);
//Increment position
samplePosition += freqPosition;
if (samplePosition >= size)
{
if (looping)
{
samplePosition = fmod(samplePosition, size);
looped = true;
}
else
{
samplePosition = 0.0;
playing = false;
looped = false;
break;
}
}
}
}
//Sound mixer
void AudioCallback(void *userdata, Uint8 *stream, int len)
{
(void)userdata;
float *buffer = (float*)stream;
const size_t frames = len / (sizeof(float) * 2);
//Clear stream
for (size_t i = 0; i < frames * 2; ++i)
buffer[i] = 0.0f;
//Mix sounds to primary buffer
for (SOUNDBUFFER *sound = soundBuffers; sound != NULL; sound = sound->next)
sound->Mix(buffer, frames);
}
//Sound things
SOUNDBUFFER* lpSECONDARYBUFFER[SOUND_NO];
BOOL InitDirectSound()
{
//Init sound
SDL_InitSubSystem(SDL_INIT_AUDIO);
//Open audio device
SDL_AudioSpec want, have;
//Set specifications we want
SDL_memset(&want, 0, sizeof(want));
want.freq = FREQUENCY;
want.format = AUDIO_F32;
want.channels = 2;
want.samples = STREAM_SIZE;
want.callback = AudioCallback;
audioDevice = SDL_OpenAudioDevice(NULL, 0, &want, &have, 0);
if (audioDevice == 0)
{
printf("Failed to open audio device\nSDL Error: %s\n", SDL_GetError());
return FALSE;
}
//Unpause audio device
SDL_PauseAudioDevice(audioDevice, 0);
//Start organya
StartOrganya();
return TRUE;
}
void EndDirectSound()
{
//Quit sub-system
SDL_QuitSubSystem(SDL_INIT_AUDIO);
//Close audio device
SDL_CloseAudioDevice(audioDevice);
//End organya
EndOrganya();
}
//Sound effects playing
void PlaySoundObject(int no, int mode)
{
if (lpSECONDARYBUFFER[no])
{
switch (mode)
{
case 0:
lpSECONDARYBUFFER[no]->Stop();
break;
case 1:
lpSECONDARYBUFFER[no]->Stop();
lpSECONDARYBUFFER[no]->SetCurrentPosition(0);
lpSECONDARYBUFFER[no]->Play(false);
break;
case -1:
lpSECONDARYBUFFER[no]->Play(true);
break;
}
}
}
void ChangeSoundFrequency(int no, unsigned long rate)
{
if (lpSECONDARYBUFFER[no])
lpSECONDARYBUFFER[no]->SetFrequency(10 * rate + 100);
}
void ChangeSoundVolume(int no, long volume)
{
if (lpSECONDARYBUFFER[no])
lpSECONDARYBUFFER[no]->SetVolume(8 * volume - 2400);
}
void ChangeSoundPan(int no, long pan)
{
if (lpSECONDARYBUFFER[no])
lpSECONDARYBUFFER[no]->SetPan(10 * (pan - 256));
}
int MakePixToneObject(const PIXTONEPARAMETER *ptp, int ptp_num, int no)
{
int sample_count = 0;
for (int i = 0; i < ptp_num; ++i)
{
if (ptp[i].size > sample_count)
sample_count = ptp[i].size;
}
unsigned char *pcm_buffer = (unsigned char*)malloc(sample_count);
unsigned char *mixed_pcm_buffer = (unsigned char*)malloc(sample_count);
memset(pcm_buffer, 0x80, sample_count);
memset(mixed_pcm_buffer, 0x80, sample_count);
for (int i = 0; i < ptp_num; ++i)
{
if (!MakePixelWaveData(&ptp[i], pcm_buffer))
{
free(pcm_buffer);
free(mixed_pcm_buffer);
return -1;
}
for (int j = 0; j < ptp[i].size; ++j)
{
if (pcm_buffer[j] + mixed_pcm_buffer[j] - 0x100 < -0x7F)
mixed_pcm_buffer[j] = 0;
else if (pcm_buffer[j] + mixed_pcm_buffer[j] - 0x100 > 0x7F)
mixed_pcm_buffer[j] = 0xFF;
else
mixed_pcm_buffer[j] += pcm_buffer[j] + -0x80;
}
}
lpSECONDARYBUFFER[no] = new SOUNDBUFFER(sample_count);
unsigned char *buf;
lpSECONDARYBUFFER[no]->Lock(&buf, NULL);
memcpy(buf, mixed_pcm_buffer, sample_count);
lpSECONDARYBUFFER[no]->Unlock();
lpSECONDARYBUFFER[no]->SetFrequency(22050);
free(pcm_buffer);
free(mixed_pcm_buffer);
return sample_count;
}