1 files changed, 139 insertions, 0 deletions
diff --git a/gearboy/src/Audio.cpp b/gearboy/src/Audio.cpp
new file mode 100644
index 00000000..c35b605d
--- /dev/null
+++ b/gearboy/src/Audio.cpp
@@ -0,0 +1,139 @@
+/*
+ * 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;
+}