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67 lines
2.6 KiB
C++
67 lines
2.6 KiB
C++
/*
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Copyright (c) 2019, 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 "RiffUtils.h"
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using namespace nqr;
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ChunkHeaderInfo nqr::ScanForChunk(const std::vector<uint8_t> & fileData, uint32_t chunkMarker)
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{
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// D[n] aligned to 16 bytes now
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const uint16_t * d = reinterpret_cast<const uint16_t *>(fileData.data());
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for (size_t i = 0; i < fileData.size() / sizeof(uint16_t); i++)
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{
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// This will be in machine endianess
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uint32_t m = Pack(Read16(d[i]), Read16(d[i+1]));
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if (m == chunkMarker)
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{
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uint32_t cSz = Pack(Read16(d[i+2]), Read16(d[i+3]));
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return {(uint32_t (i * sizeof(uint16_t))), cSz}; // return i in bytes to the start of the data
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}
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else continue;
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}
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return {0, 0};
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};
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WaveChunkHeader nqr::MakeWaveHeader(const EncoderParams param, const int sampleRate)
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{
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WaveChunkHeader header;
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int bitdepth = GetFormatBitsPerSample(param.targetFormat);
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header.fmt_id = GenerateChunkCode('f', 'm', 't', ' ');
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header.chunk_size = 16;
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header.format = (param.targetFormat <= PCMFormat::PCM_32) ? WaveFormatCode::FORMAT_PCM : WaveFormatCode::FORMAT_IEEE;
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header.channel_count = param.channelCount;
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header.sample_rate = sampleRate;
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header.data_rate = sampleRate * param.channelCount * (bitdepth / 8);
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header.frame_size = param.channelCount * (bitdepth / 8);
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header.bit_depth = bitdepth;
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return header;
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}
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