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https://github.com/mudita/MuditaOS.git
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9b7d5be07a
Fix of the issue that only files with extension in lowercase were detected and listed in the music player's library. Additionally code cleanup.
74 lines
2.3 KiB
C++
74 lines
2.3 KiB
C++
// Copyright (c) 2017-2022, 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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#define DR_MP3_IMPLEMENTATION
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#define DR_MP3_NO_STDIO
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#include "decoderMP3.hpp"
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#include <cstdio>
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namespace audio
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{
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decoderMP3::decoderMP3(const std::string &filePath) : Decoder(filePath)
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{
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if (fileSize == 0) {
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return;
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}
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mp3 = std::make_unique<drmp3>();
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drmp3_init(mp3.get(), drmp3_read, drmp3_seek, this, nullptr);
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if (mp3 == nullptr) {
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LOG_ERROR("Unable to initialize MP3 decoder");
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return;
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}
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chanNumber = mp3->channels;
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sampleRate = mp3->sampleRate;
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// NOTE: Always convert to S16LE as internal format
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bitsPerSample = 16;
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isInitialized = true;
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}
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decoderMP3::~decoderMP3()
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{
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drmp3_uninit(mp3.get());
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}
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void decoderMP3::setPosition(float pos)
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{
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if (!isInitialized) {
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LOG_ERROR("MP3 decoder not initialized");
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return;
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}
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auto totalFramesCount = drmp3_get_pcm_frame_count(mp3.get());
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drmp3_seek_to_pcm_frame(mp3.get(), totalFramesCount * pos);
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position = static_cast<float>(totalFramesCount) * pos / static_cast<float>(sampleRate);
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}
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std::uint32_t decoderMP3::decode(std::uint32_t samplesToRead, std::int16_t *pcmData)
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{
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std::uint32_t samplesRead =
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drmp3_read_pcm_frames_s16(mp3.get(), samplesToRead / chanNumber, reinterpret_cast<drmp3_int16 *>(pcmData));
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if (samplesRead > 0) {
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position += static_cast<float>(samplesRead) / static_cast<float>(sampleRate);
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}
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return samplesRead * chanNumber;
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}
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size_t decoderMP3::drmp3_read(void *pUserData, void *pBufferOut, size_t bytesToRead)
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{
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const auto decoderContext = reinterpret_cast<decoderMP3 *>(pUserData);
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return std::fread(pBufferOut, 1, bytesToRead, decoderContext->fd);
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}
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drmp3_bool32 decoderMP3::drmp3_seek(void *pUserData, int offset, drmp3_seek_origin origin)
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{
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const auto decoderContext = reinterpret_cast<decoderMP3 *>(pUserData);
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const int seekError =
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std::fseek(decoderContext->fd, offset, origin == drmp3_seek_origin_start ? SEEK_SET : SEEK_CUR);
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return (seekError == 0) ? DRMP3_TRUE : DRMP3_FALSE;
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}
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} // namespace audio
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