Differential D2716 Diff 9122 extern/audaspace/src/respec/Mixer.cpp

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extern/audaspace/src/respec/Mixer.cpp

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				/*******************************************************************************
				* Copyright 2009-2016 Jörg Müller
				*
				* Licensed under the Apache License, Version 2.0 (the "License");
				* you may not use this file except in compliance with the License.
				* You may obtain a copy of the License at
				*
				* http://www.apache.org/licenses/LICENSE-2.0
				*
				* Unless required by applicable law or agreed to in writing, software
				* distributed under the License is distributed on an "AS IS" BASIS,
				* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
				* See the License for the specific language governing permissions and
				* limitations under the License.
				******************************************************************************/

				#include "respec/Mixer.h"

				#include <algorithm>
				#include <cstring>

				AUD_NAMESPACE_BEGIN

				Mixer::Mixer(DeviceSpecs specs) :
				m_specs(specs)
				{
				switch(m_specs.format)
				{
				case FORMAT_U8:
				m_convert = convert_float_u8;
				break;
				case FORMAT_S16:
				m_convert = convert_float_s16;
				break;
				case FORMAT_S24:

				#ifdef __BIG_ENDIAN__
				m_convert = convert_float_s24_be;
				#else
				m_convert = convert_float_s24_le;
				#endif
				break;
				case FORMAT_S32:
				m_convert = convert_float_s32;
				break;
				case FORMAT_FLOAT32:
				m_convert = convert_copy<float>;
				break;
				case FORMAT_FLOAT64:
				m_convert = convert_float_double;
				break;
				default:
				break;
				}
				}

				DeviceSpecs Mixer::getSpecs() const
				{
				return m_specs;
				}

				void Mixer::setSpecs(Specs specs)
				{
				m_specs.specs = specs;
				}

				void Mixer::clear(int length)
				{
				m_buffer.assureSize(length * m_specs.channels * AUD_SAMPLE_SIZE(m_specs));

				m_length = length;

				std::memset(m_buffer.getBuffer(), 0, length * m_specs.channels * AUD_SAMPLE_SIZE(m_specs));
				}

				void Mixer::mix(sample_t* buffer, int start, int length, float volume)
				{
				sample_t* out = m_buffer.getBuffer();

				length = (std::min(m_length, length + start) - start) * m_specs.channels;
				start *= m_specs.channels;

				for(int i = 0; i < length; i++)
				out[i + start] += buffer[i] * volume;
				}

				void Mixer::mix(sample_t* buffer, int start, int length, float volume_to, float volume_from)
				{
				sample_t* out = m_buffer.getBuffer();

				length = (std::min(m_length, length + start) - start);

				for(int i = 0; i < length; i++)
				{
				float volume = volume_from * (1.0f - i / float(length)) + volume_to * (i / float(length));

				for(int c = 0; c < m_specs.channels; c++)
				out[(i + start) * m_specs.channels + c] += buffer[i * m_specs.channels + c] * volume;
				}
				}

				void Mixer::read(data_t* buffer, float volume)
				{
				sample_t* out = m_buffer.getBuffer();

				for(int i = 0; i < m_length * m_specs.channels; i++)
				out[i] *= volume;

				m_convert(buffer, (data_t) out, m_length m_specs.channels);
				}

				AUD_NAMESPACE_END