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/*
* Mixer.cpp
*
* Created on: 11 Apr 2015
* Author: jeremy
*/
#include "Mixer.h"
#include <algorithm>
namespace Sound
{
Mixer::Mixer() noexcept
{
return;
}
Mixer::~Mixer()
{
return;
}
void Mixer::PlaySound(int id, float volume)
{
auto s = std::find_if(playList.begin(), playList.end(), [&id](SoundState& s)
{
return id == s.id && !s.isPlaying.load(std::memory_order_relaxed);
});
if(s != playList.end())
{
// The sound is already in playList
//soundBank->sounds[s->id].Seek(0);
s->volume = volume;
s->index = 0;
s->isPlaying.store(true, std::memory_order_release);
}
else
{
// Add sound to playList
//playList.emplace_back(id, volume, true);
const auto index = playListIndex.fetch_add(1, std::memory_order_relaxed);
// Protect from overflow (ignore new sound...)
if(index >= playList.size())
{
return;
}
playList[index].id = id;
playList[index].volume = volume;
playList[index].isPlaying.store(true, std::memory_order_release);
}
return;
}
void Mixer::StopSound(int id)
{
// Stop sound in the play list
for(auto& sound : playList)
{
if(sound.id == id)
{
sound.isPlaying.store(false, std::memory_order_relaxed);
}
}
return;
}
void Mixer::Mix(std::vector<short>& buffer) noexcept
{
// Fill buffer with zeros
std::fill(buffer.begin(), buffer.end(), 0);
std::size_t periodSize = buffer.size();
// Mix sounds
for(std::size_t si = 0; si < playList.size(); si++)
{
if(playList[si].isPlaying.load(std::memory_order_acquire))
{
SoundState& soundState = playList[si];
Sound& sound = soundBank->sounds[soundState.id];
if(sound.HasMoreData(soundState.index, periodSize))
{
const float volume = sound.GetVolume();
const float mix_volume = soundState.volume;
if(sound.IsLoop())
{
std::size_t prevIdx = sound.LoadIndex();
if(prevIdx % sound.GetLength() < periodSize)
{
sound.SetStartTime();
}
for(std::size_t i = 0; i < periodSize; i++)
{
buffer[i] += volume * mix_volume * sound.GetValue(i + soundState.index);
}
sound.StoreIndex(soundState.index);
}
else
{
const short* data = sound.GetData();
const std::size_t idx = soundState.index;
for(std::size_t i = 0; i < periodSize; i++)
{
buffer[i] += volume * mix_volume * data[idx + i];
}
}
soundState.index += periodSize;
//sound.AddToIndex(periodSize);
}
else
{
soundState.isPlaying.store(false, std::memory_order_relaxed);
}
}
}
return;
}
/**
* @brief Stops all sounds (must be done after the mixer has been stopped).
*
*/
void Mixer::Clear() noexcept
{
playListIndex.store(0, std::memory_order_relaxed);
for(auto& s : playList)
{
s.isPlaying.store(false, std::memory_order_relaxed);
}
}
}
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