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https://github.com/mudita/MuditaOS.git
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36b0228de2
* Fix of the issue that seeking in large MP3 file would cause OOM error when creating MP3 indexes. This caused OS crash when looping large MP3 file in Relaxation. * Minor cleanups.
108 lines
3.6 KiB
C++
108 lines
3.6 KiB
C++
// Copyright (c) 2017-2025, Mudita Sp. z.o.o. All rights reserved.
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// For licensing, see https://github.com/mudita/MuditaOS/blob/master/LICENSE.md
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#define MINIMP3_IMPLEMENTATION
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#define MINIMP3_NO_STDIO
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#include "DecoderCommon.hpp"
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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)
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: Decoder(filePath), dec(std::make_unique<mp3dec_ex_t>()), io(std::make_unique<mp3dec_io_t>())
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{
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if (fileSize == 0) {
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return;
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}
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io->read = mp3Read;
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io->read_data = this;
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io->seek = mp3Seek;
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io->seek_data = this;
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dec->io = io.get();
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const auto decoderStatus = mp3dec_ex_open_cb(dec.get(), dec->io, MP3D_SEEK_TO_SAMPLE | MP3D_DO_NOT_SCAN);
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if (decoderStatus != 0) {
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LOG_ERROR("Failed to open minimp3, error %d", decoderStatus);
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return;
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}
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/* NOTE: Always convert to S16LE as an internal format */
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channelCount = dec->info.channels;
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sampleRate = dec->info.hz;
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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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if (!isInitialized) {
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return;
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}
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mp3dec_ex_close(dec.get());
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isInitialized = false;
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}
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auto DecoderMP3::setPosition(float pos) -> void
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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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const auto sampleToSeek = static_cast<std::uint64_t>(dec->samples * pos);
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const auto frameToSeek = sampleToSeek / channelCount;
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const auto status = mp3dec_ex_seek(dec.get(), sampleToSeek);
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if (status != 0) {
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LOG_ERROR(
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"Failed to seek to frame %" PRIu64 " in file '%s', error %d!", frameToSeek, filePath.c_str(), status);
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}
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position = frameToSeek / static_cast<float>(sampleRate);
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}
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auto DecoderMP3::rewind() -> void
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{
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setPosition(0.0f);
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}
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auto DecoderMP3::decode(std::uint32_t samplesToRead, std::int16_t *pcmData) -> std::int32_t
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{
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const auto samplesRead = mp3dec_ex_read(dec.get(), reinterpret_cast<mp3d_sample_t *>(pcmData), samplesToRead);
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if (samplesRead > 0) {
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/* Calculate frame duration in seconds */
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const auto framesRead = static_cast<float>(samplesRead) / static_cast<float>(channelCount);
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position += framesRead / static_cast<float>(sampleRate);
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}
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else if (!fileExists(fd)) {
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/* Unfortunately this second check of file existence is needed
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* to verify whether lack of new samples was caused by EOF or by
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* deletion of the file. */
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LOG_WARN("File '%s' was deleted during playback!", filePath.c_str());
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return fileDeletedRetCode;
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}
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return samplesRead;
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}
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auto DecoderMP3::mp3Read(void *pBufferOut, std::size_t bytesToRead, void *pUserData) -> std::size_t
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{
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const auto decoderContext = static_cast<DecoderMP3 *>(pUserData);
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/* Check if the file exists - std::fread happily returns bytesToRead if
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* requested to read from deleted file, what causes decoding library
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* to enter infinite loop of reading. */
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if (!fileExists(decoderContext->fd)) {
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return 0;
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}
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return std::fread(pBufferOut, 1, bytesToRead, decoderContext->fd);
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}
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auto DecoderMP3::mp3Seek(std::uint64_t offset, void *pUserData) -> int
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{
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const auto decoderContext = static_cast<DecoderMP3 *>(pUserData);
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return std::fseek(decoderContext->fd, offset, SEEK_SET);
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}
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} // namespace audio
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