116 lines
2.6 KiB
C++
116 lines
2.6 KiB
C++
/*
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* $Id$
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*
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* Copyright 2009-2011 Jörg Hermann Müller
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*
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* This file is part of AudaSpace.
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*
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* Audaspace is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* AudaSpace is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Audaspace; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* ***** END GPL LICENSE BLOCK *****
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*/
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/** \file audaspace/intern/AUD_Mixer.cpp
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* \ingroup audaspaceintern
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*/
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#include "AUD_Mixer.h"
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#include "AUD_IReader.h"
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#include <cstring>
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AUD_Mixer::AUD_Mixer(AUD_DeviceSpecs specs) :
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m_specs(specs)
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{
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int bigendian = 1;
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bigendian = (((char*)&bigendian)[0]) ? 0: 1; // 1 if Big Endian
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switch(m_specs.format)
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{
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case AUD_FORMAT_U8:
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m_convert = AUD_convert_float_u8;
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break;
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case AUD_FORMAT_S16:
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m_convert = AUD_convert_float_s16;
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break;
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case AUD_FORMAT_S24:
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if(bigendian)
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m_convert = AUD_convert_float_s24_be;
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else
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m_convert = AUD_convert_float_s24_le;
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break;
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case AUD_FORMAT_S32:
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m_convert = AUD_convert_float_s32;
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break;
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case AUD_FORMAT_FLOAT32:
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m_convert = AUD_convert_copy<float>;
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break;
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case AUD_FORMAT_FLOAT64:
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m_convert = AUD_convert_float_double;
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break;
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default:
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break;
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}
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}
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AUD_DeviceSpecs AUD_Mixer::getSpecs() const
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{
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return m_specs;
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}
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void AUD_Mixer::add(sample_t* buffer, int start, int length, float volume)
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{
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AUD_MixerBuffer buf;
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buf.buffer = buffer;
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buf.start = start;
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buf.length = length;
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buf.volume = volume;
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m_buffers.push_back(buf);
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}
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void AUD_Mixer::superpose(data_t* buffer, int length, float volume)
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{
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AUD_MixerBuffer buf;
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int channels = m_specs.channels;
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if(m_buffer.getSize() < length * channels * 4)
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m_buffer.resize(length * channels * 4);
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sample_t* out = m_buffer.getBuffer();
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sample_t* in;
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memset(out, 0, length * channels * 4);
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int end;
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while(!m_buffers.empty())
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{
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buf = m_buffers.front();
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m_buffers.pop_front();
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end = buf.length * channels;
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in = buf.buffer;
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for(int i = 0; i < end; i++)
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out[i + buf.start * channels] += in[i] * buf.volume * volume;
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}
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m_convert(buffer, (data_t*) out, length * channels);
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}
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