52 lines
1.8 KiB
C++
52 lines
1.8 KiB
C++
/*
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* SampleCopy.h
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* ------------
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* Purpose: Functions for copying sample data.
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* Notes : (currently none)
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* Authors: OpenMPT Devs
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* The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
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*/
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#pragma once
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#include "openmpt/all/BuildSettings.hpp"
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#include "openmpt/soundbase/SampleConvert.hpp"
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#include "openmpt/soundbase/SampleDecode.hpp"
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OPENMPT_NAMESPACE_BEGIN
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// Copy a sample data buffer.
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// targetBuffer: Buffer in which the sample should be copied into.
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// numSamples: Number of samples of size T that should be copied. targetBuffer is expected to be able to hold "numSamples * incTarget" samples.
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// incTarget: Number of samples by which the target data pointer is increased each time.
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// sourceBuffer: Buffer from which the samples should be read.
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// sourceSize: Size of source buffer, in bytes.
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// incSource: Number of samples by which the source data pointer is increased each time.
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//
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// Template arguments:
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// SampleConversion: Functor of type SampleConversionFunctor to apply sample conversion (see above for existing functors).
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template <typename SampleConversion>
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size_t CopySample(typename SampleConversion::output_t *MPT_RESTRICT outBuf, size_t numSamples, size_t incTarget, const typename SampleConversion::input_t *MPT_RESTRICT inBuf, size_t sourceSize, size_t incSource, SampleConversion conv = SampleConversion())
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{
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const size_t sampleSize = incSource * SampleConversion::input_inc * sizeof(typename SampleConversion::input_t);
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LimitMax(numSamples, sourceSize / sampleSize);
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const size_t copySize = numSamples * sampleSize;
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SampleConversion sampleConv(conv);
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while(numSamples--)
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{
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*outBuf = sampleConv(inBuf);
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outBuf += incTarget;
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inBuf += incSource * SampleConversion::input_inc;
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}
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return copySize;
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}
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OPENMPT_NAMESPACE_END
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