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89 lines
2.8 KiB
C++
89 lines
2.8 KiB
C++
/*
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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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#ifndef WAVE_ENCODER_H
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#define WAVE_ENCODER_H
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#include "Common.h"
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#include "WavDecoder.h"
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#include "RiffUtils.h"
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namespace nqr
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{
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static inline void linear_resample(const double rate, const std::vector<float> & input, std::vector<float> & output, size_t samplesToProcess)
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{
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float * source = const_cast<float *>(input.data());
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double virtualReadIndex = 0;
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// Linear Interpolate
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int n = samplesToProcess - 1;
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while (n--)
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{
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unsigned readIndex = static_cast<unsigned>(virtualReadIndex);
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double interpolationFactor = virtualReadIndex - readIndex;
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double sample1 = source[readIndex];
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double sample2 = source[readIndex + 1];
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double sample = (1.0 - interpolationFactor) * sample1 + interpolationFactor * sample2;
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output.push_back(sample);
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virtualReadIndex += rate;
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}
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}
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enum EncoderError
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{
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NoError,
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InsufficientSampleData,
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FileIOError,
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UnsupportedSamplerate,
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UnsupportedChannelConfiguration,
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UnsupportedBitdepth,
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UnsupportedChannelMix,
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BufferTooBig,
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};
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// A simplistic encoder that takes a blob of data, conforms it to the user's
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// EncoderParams preference, and writes to disk. Be warned, does not support resampling!
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// @todo support dithering, samplerate conversion, etc.
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struct WavEncoder
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{
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// Assume data adheres to EncoderParams, except for bit depth and fmt
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static int WriteFile(const EncoderParams p, const AudioData * d, const std::string & path);
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};
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struct OggOpusEncoder
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{
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static int WriteFile(const EncoderParams p, const AudioData * d, const std::string & path);
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};
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} // end namespace nqr
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#endif
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