kopia lustrzana https://github.com/markondej/fm_transmitter
89 wiersze
3.0 KiB
C++
89 wiersze
3.0 KiB
C++
/*
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FM Transmitter - use Raspberry Pi as FM transmitter
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Copyright (c) 2021, Marcin Kondej
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All rights reserved.
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See https://github.com/markondej/fm_transmitter
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Redistribution and use in source and binary forms, with or without modification, are
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permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice, this list
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of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice, this
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list of conditions and the following disclaimer in the documentation and/or other
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materials provided with the distribution.
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3. Neither the name of the copyright holder nor the names of its contributors may be
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used to endorse or promote products derived from this software without specific
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prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
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WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <cstdint>
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#include <string>
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#include <vector>
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#include <mutex>
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#define WAVE_FORMAT_PCM 0x0001
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struct WaveHeader
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{
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uint8_t chunkID[4];
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uint32_t chunkSize;
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uint8_t format[4];
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uint8_t subchunk1ID[4];
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uint32_t subchunk1Size;
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uint16_t audioFormat;
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uint16_t channels;
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uint32_t sampleRate;
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uint32_t byteRate;
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uint16_t blockAlign;
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uint16_t bitsPerSample;
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uint8_t subchunk2ID[4];
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uint32_t subchunk2Size;
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};
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class Sample
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{
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public:
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Sample(uint8_t *data, unsigned channels, unsigned bitsPerChannel);
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float GetMonoValue() const;
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protected:
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float value;
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};
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class WaveReader
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{
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public:
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WaveReader(const std::string &filename, bool &enable, std::mutex &mtx);
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virtual ~WaveReader();
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WaveReader(const WaveReader &) = delete;
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WaveReader(WaveReader &&) = delete;
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WaveReader &operator=(const WaveReader &) = delete;
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std::string GetFilename() const;
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const WaveHeader &GetHeader() const;
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std::vector<Sample> GetSamples(unsigned quantity, bool &enable, std::mutex &mtx);
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bool SetSampleOffset(unsigned offset);
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private:
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std::vector<uint8_t> ReadData(unsigned bytesToRead, bool headerBytes, bool &enable, std::mutex &mtx);
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std::string filename;
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WaveHeader header;
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unsigned dataOffset, headerOffset, currentDataOffset;
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int fileDescriptor;
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};
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