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////////////////////////////////////////////////////////////////////////////////////////
//
// Nestopia - NES/Famicom emulator written in C++
//
// Copyright (C) 2003-2008 Martin Freij
//
// This file is part of Nestopia.
//
// Nestopia 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 2 of the License, or
// (at your option) any later version.
//
// Nestopia 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 Nestopia; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
////////////////////////////////////////////////////////////////////////////////////////
#include "NstCpu.hpp"
#include "NstSoundPcm.hpp"
namespace Nes
{
namespace Core
{
namespace Sound
{
#ifdef NST_MSVC_OPTIMIZE
#pragma optimize("s", on)
#endif
Pcm::Pcm(Apu& a)
: Channel(a)
{
Connect( UpdateSettings() );
}
bool Pcm::CanDo(uint bits,dword rate)
{
return (bits == 8 || bits == 16) && (rate >= 8000 && rate <= 96000);
}
void Pcm::Reset()
{
Stop();
}
bool Pcm::UpdateSettings()
{
Stop();
rate = GetSampleRate();
muted = IsMuted();
return true;
}
#ifdef NST_MSVC_OPTIMIZE
#pragma optimize("", on)
#endif
void Pcm::Play(const iword* w,dword l,dword r)
{
NST_ASSERT( w && l && CanDo(16,r) );
pos = 0;
wave.data = w;
wave.length = l;
wave.rate = r;
}
void Pcm::Stop()
{
pos = 0;
wave.data = NULL;
wave.length = 0;
wave.rate = 0;
}
Pcm::Sample Pcm::GetSample()
{
if (wave.data)
{
const dword i = pos / rate;
if (i < wave.length)
{
pos += wave.rate;
return !muted ? wave.data[i] : 0;
}
wave.data = NULL;
}
return 0;
}
}
}
}
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