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https://github.com/mudita/MuditaOS.git
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871b250d86
Refactor audio data path to fix several synchronization issues and excessive copy operations on large memory blocks. Introduce audio::Stream data structure to allow connecting audio source and sink with a zero-copy capability. Introduce system mechanisms: - critical section guard lock needed for stream synchronization - non-cacheable memory allocator to allocate memory for DMA safe buffers Update the Googletest CMake template to match the capabilities of the Catch2 template. Signed-off-by: Marcin Smoczyński <smoczynski.marcin@gmail.com> Signed-off-by: Hubert Chrzaniuk <hubert.chrzaniuk@mudita.com>
81 lines
2.1 KiB
C++
81 lines
2.1 KiB
C++
// Copyright (c) 2017-2020, Mudita Sp. z.o.o. All rights reserved.
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// For licensing, see https://github.com/mudita/MuditaOS/LICENSE.md
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#include "decoderWAV.hpp"
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#include "Audio/AudioCommon.hpp"
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namespace audio
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{
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decoderWAV::decoderWAV(const char *fileName) : Decoder(fileName)
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{
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if (fileSize == 0) {
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return;
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}
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if (fd == NULL) {
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return;
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}
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if (std::fread(&waveHeader, 1, sizeof(waveHeader), fd) != sizeof(WAVE_FormatTypeDef)) {
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return;
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}
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// TODO:M.P; implement support for sample size different than 16bit
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// pcmsamplesbuffer.reserve(1024);
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sampleRate = waveHeader.SampleRate;
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bitsPerSample = waveHeader.BitPerSample;
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chanNumber = waveHeader.NbrChannels;
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isInitialized = true;
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}
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uint32_t decoderWAV::decode(uint32_t samplesToRead, int16_t *pcmData)
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{
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uint32_t samples_read = 0;
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/* TODO:M.P; implement support for sample size different than 16bit
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if(samplesToRead > pcmsamplesbuffer.max_size()){
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pcmsamplesbuffer.resize(samplesToRead);
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}*/
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switch (bitsPerSample) {
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case 8:
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// TODO:M.P not supported
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break;
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case 16:
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samples_read = std::fread(pcmData, sizeof(int16_t), samplesToRead, fd);
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break;
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case 24:
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// TODO:M.P not supported
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break;
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case 32:
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// TODO:M.P not supported
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break;
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}
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if (samples_read) {
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/* Calculate frame duration in seconds */
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position +=
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(float)((float)(chanNumber == 2 ? samplesToRead / chanNumber : samplesToRead) / (float)(sampleRate));
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}
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return samples_read;
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}
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void decoderWAV::setPosition(float pos)
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{
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std::fseek(fd, (fileSize * pos) + sizeof(WAVE_FormatTypeDef), SEEK_SET);
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// Calculate new position
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position = (float)((float)(std::ftell(fd) / sizeof(int16_t) / chanNumber) / (float)(sampleRate));
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}
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} // namespace audio
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