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/*
* Gearboy - Nintendo Game Boy Emulator
* Copyright (C) 2012 Ignacio Sanchez
* This program 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
* any later version.
* This program 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 this program. If not, see http://www.gnu.org/licenses/
*
*/
#include "Audio.h"
#include "Memory.h"
Audio::Audio()
{
m_bCGB = false;
m_ElapsedCycles = 0;
m_SampleRate = 44100;
InitPointer(m_pApu);
InitPointer(m_pBuffer);
InitPointer(m_pSampleBuffer);
}
Audio::~Audio()
{
SafeDelete(m_pApu);
SafeDelete(m_pBuffer);
SafeDeleteArray(m_pSampleBuffer);
}
void Audio::Init()
{
m_pSampleBuffer = new blip_sample_t[AUDIO_BUFFER_SIZE];
m_pApu = new Gb_Apu();
m_pBuffer = new Stereo_Buffer();
m_pBuffer->clock_rate(4194304);
m_pBuffer->set_sample_rate(m_SampleRate);
//m_pApu->treble_eq(-15.0);
//m_pBuffer->bass_freq(100);
m_pApu->set_output(m_pBuffer->center(), m_pBuffer->left(), m_pBuffer->right());
}
void Audio::Reset(bool bCGB)
{
m_bCGB = bCGB;
Gb_Apu::mode_t mode = m_bCGB ? Gb_Apu::mode_cgb : Gb_Apu::mode_dmg;
m_pApu->reset(mode);
m_pBuffer->clear();
for (int reg = 0xFF10; reg <= 0xFF3F; reg++)
{
u8 value = m_bCGB ? kInitialValuesForColorFFXX[reg - 0xFF00] : kInitialValuesForFFXX[reg - 0xFF00];
m_pApu->write_register(0, reg, value);
}
m_ElapsedCycles = 0;
}
void Audio::SetSampleRate(int rate)
{
if (rate != m_SampleRate)
{
m_SampleRate = rate;
m_pBuffer->set_sample_rate(m_SampleRate);
}
}
void Audio::SetVolume(float volume)
{
m_pApu->volume(volume);
}
void Audio::EndFrame(s16* pSampleBuffer, int* pSampleCount)
{
m_pApu->end_frame(m_ElapsedCycles);
m_pBuffer->end_frame(m_ElapsedCycles);
int count = static_cast<int>(m_pBuffer->read_samples(m_pSampleBuffer, AUDIO_BUFFER_SIZE));
if (IsValidPointer(pSampleBuffer) && IsValidPointer(pSampleCount))
{
*pSampleCount = count;
for (int i=0; i<count; i++)
{
pSampleBuffer[i] = m_pSampleBuffer[i];
}
}
m_ElapsedCycles = 0;
}
void Audio::SaveState(std::ostream& stream)
{
using namespace std;
gb_apu_state_t apu_state;
m_pApu->save_state(&apu_state);
stream.write(reinterpret_cast<const char*> (&m_ElapsedCycles), sizeof(m_ElapsedCycles));
stream.write(reinterpret_cast<const char*> (m_pSampleBuffer), sizeof(blip_sample_t) * AUDIO_BUFFER_SIZE);
stream.write(reinterpret_cast<const char*> (&apu_state), sizeof(apu_state));
}
void Audio::LoadState(std::istream& stream)
{
using namespace std;
gb_apu_state_t apu_state;
stream.read(reinterpret_cast<char*> (&m_ElapsedCycles), sizeof(m_ElapsedCycles));
stream.read(reinterpret_cast<char*> (m_pSampleBuffer), sizeof(blip_sample_t) * AUDIO_BUFFER_SIZE);
stream.read(reinterpret_cast<char*> (&apu_state), sizeof(apu_state));
Gb_Apu::mode_t mode = m_bCGB ? Gb_Apu::mode_cgb : Gb_Apu::mode_dmg;
m_pApu->reset(mode);
m_pApu->load_state(apu_state);
m_pBuffer->clear();
}
Gb_Apu* Audio::GetApu()
{
return m_pApu;
}
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