mirror of
https://github.com/mudita/MuditaOS.git
synced 2026-02-20 07:55:27 -05:00
1cf85c7686
* add minimp3 for decoding mp3 files * add a gapless transition between the end and beginning of the track * add a loop option to the playback mode
93 lines
3.0 KiB
C++
93 lines
3.0 KiB
C++
// Copyright (c) 2017-2024, Mudita Sp. z.o.o. All rights reserved.
|
|
// For licensing, see https://github.com/mudita/MuditaOS/LICENSE.md
|
|
|
|
#define MINIMP3_IMPLEMENTATION
|
|
#define MINIMP3_NO_STDIO
|
|
|
|
#include "DecoderCommon.hpp"
|
|
#include "DecoderMP3.hpp"
|
|
#include <cstdio>
|
|
|
|
namespace audio
|
|
{
|
|
DecoderMP3::DecoderMP3(const std::string &filePath)
|
|
: Decoder(filePath), dec(std::make_unique<mp3dec_ex_t>()), io(std::make_unique<mp3dec_io_t>())
|
|
{
|
|
if (fileSize == 0) {
|
|
return;
|
|
}
|
|
|
|
io->read = mp3Read;
|
|
io->read_data = this;
|
|
io->seek = mp3Seek;
|
|
io->seek_data = this;
|
|
dec->io = io.get();
|
|
|
|
if (mp3dec_ex_open_cb(dec.get(), dec->io, MP3D_SEEK_TO_SAMPLE)) {
|
|
LOG_ERROR("Failed to open minimp3");
|
|
return;
|
|
}
|
|
|
|
/* NOTE: Always convert to S16LE as an internal format */
|
|
channelCount = dec->info.channels;
|
|
sampleRate = dec->info.hz;
|
|
bitsPerSample = 16;
|
|
isInitialized = true;
|
|
}
|
|
|
|
DecoderMP3::~DecoderMP3()
|
|
{
|
|
if (!isInitialized) {
|
|
return;
|
|
}
|
|
mp3dec_ex_close(dec.get());
|
|
isInitialized = false;
|
|
}
|
|
|
|
void DecoderMP3::setPosition(float pos)
|
|
{
|
|
if (!isInitialized) {
|
|
LOG_ERROR("MP3 decoder not initialized");
|
|
return;
|
|
}
|
|
mp3dec_ex_seek(dec.get(), pos);
|
|
}
|
|
|
|
std::int32_t DecoderMP3::decode(std::uint32_t samplesToRead, std::int16_t *pcmData)
|
|
{
|
|
const auto samplesRead = mp3dec_ex_read(dec.get(), reinterpret_cast<mp3d_sample_t *>(pcmData), samplesToRead);
|
|
if (samplesRead > 0) {
|
|
/* Calculate frame duration in seconds */
|
|
const auto samplesPerChannel = static_cast<float>(samplesRead) / static_cast<float>(channelCount);
|
|
position += samplesPerChannel / static_cast<float>(sampleRate);
|
|
}
|
|
else if (!fileExists(fd)) {
|
|
/* Unfortunately this second check of file existence is needed
|
|
* to verify whether lack of new samples was caused by EOF or by
|
|
* deletion of the file. */
|
|
LOG_WARN("File '%s' was deleted during playback!", filePath.c_str());
|
|
return fileDeletedRetCode;
|
|
}
|
|
return samplesRead;
|
|
}
|
|
|
|
std::size_t DecoderMP3::mp3Read(void *pBufferOut, std::size_t bytesToRead, void *pUserData)
|
|
{
|
|
const auto decoderContext = reinterpret_cast<DecoderMP3 *>(pUserData);
|
|
|
|
/* Check if the file exists - std::fread happily returns bytesToRead if
|
|
* requested to read from deleted file, what causes decoding library
|
|
* to enter infinite loop of reading. */
|
|
if (!fileExists(decoderContext->fd)) {
|
|
return 0;
|
|
}
|
|
return std::fread(pBufferOut, 1, bytesToRead, decoderContext->fd);
|
|
}
|
|
|
|
int DecoderMP3::mp3Seek(std::uint64_t offset, void *pUserData)
|
|
{
|
|
const auto decoderContext = reinterpret_cast<DecoderMP3 *>(pUserData);
|
|
return std::fseek(decoderContext->fd, offset, SEEK_SET);
|
|
}
|
|
} // namespace audio
|