space normalization and coding style guidelines
Dimitri Diakopoulos
11 years ago
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2d8d4543b7
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28ef233715
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/*
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Copyright (c) 2015, Dimitri Diakopoulos All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "Common.h"
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/*
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AudioSampleBuffer can be backed by a memory store such as standard vector,
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a file, such as NyquistFileBuffer, or some platform specific DMA backed
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thingamajig, or a memmaped file.
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*/
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template <typename Buffer>
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struct AudioSampleBuffer
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{
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// RAII object to temporarily map a data buffer into R/O memory
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struct Data
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{
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Data(AudioSampleBuffer&); // map data into CPU memory
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~Data(); // unmap data
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void *data();
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size_t size();
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};
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// RAII object to temporarily map a data buffer into R/W memory
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struct MutableData
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{
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MutableData(AudioSampleBuffer&); // map data into CPU memory
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~MutableData(); // unmap data after copying contents back to backing store
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void *data();
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size_t size();
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};
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AudioSampleBuffer(std::function<size_t(size_t, Buffer)> resize,
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std::function<void()> dealloc)
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: resize(resize), dealloc(dealloc)
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{
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}
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~AudioSampleBuffer()
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{
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if (dealloc)
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dealloc();
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}
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size_t resize(size_t sz)
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{
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if (resize)
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return resize(sz, &buffer);
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return buffer.size();
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}
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private:
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AudioSampleBuffer() = 0;
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Buffer buffer;
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std::function<size_t(size_t, Buffer*)> _resize;
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std::function<void()> _dealloc;
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};
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struct AudioData
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{
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AudioData() : channelCount(0), sampleRate(0), bitDepth(0), lengthSeconds(0), frameSize(0) { }
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AudioData(const AudioData& rhs)
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: channelCount(rhs.channelCount), sampleRate(rhs.sampleRate), bitDepth(rhs.bitDepth)
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, lengthInSeconds(rhs.lengthInSeconds), frameSize(rhs.frameSize), samples(rhs.samples) { }
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int channelCount; // unsigned?
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int sampleRate; // ditto?
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int bitDepth; // ditto?
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double lengthSeconds;
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// since it does make sense to set this (does it?) it should probably be a function not a data value
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size_t frameSize; // channels * bits per sample
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AudioSampleBuffer samples;
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//@todo: add field: streamable
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//@todo: add field: channel layout
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//@todo: add field: lossy / lossless
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void mixToChannels(int channelCount);
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void resample(int sampleRate);
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void setBitDepth(int bitDepth);
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void setLength(double lengthInSeconds);
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};
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// in general nice to pass string ref
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void LoadFile(AudioData * dataResult, const std::string & path)
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{
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string extension = path.substr(path.rfind('.') + 1, path.length());
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if (!extension.length())
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return;
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if (extension == "ogg")
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{
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VorbisDecoder::LoadFile(dataResult, path);
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}
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else if (extension == "wav")
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{
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VorbisDecoder::LoadFile(dataResult, path);
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}
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else
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{
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// etc.
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}
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}
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void LoadFile(AudioData * dataResult, const std::string & path, bool conformToData)
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{
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if (!conformToData)
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{
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LoadFile(dataResult, path);
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}
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else
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{
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AudioData * conform = new dataResult(dataResult); // add copy constructor
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LoadFile(dataResult, path);
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if (conform->channelCount && (conform->channelCount != dataResult->channelCount))
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dataResult->mixToChannels(conform->channelCount);
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if (conform->sampleRate && (conform->sampleRate != dataResult->sampleRate))
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dataResult->resample(conform->sampleRate);
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if (conform->bitDepth && (conform->bitDepth != dataResult->bitDepth))
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dataResult->setBitDepth(conform->bitDepth);
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if (conform->lengthInSeconds > 0 && (conform->lengthSeconds != dataResult->lengthSeconds))
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dataResult->setLength(conform->lengthSeconds);
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}
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}
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