Method open

core/audio/AudioDecoderMp3.cpp:128–241

}

bool AudioDecoderMp3::open(std::string_view fullPath)
{
#if !AX_USE_MPG123
    do
    {
        _fileStream = FileUtils::getInstance()->openFileStream(fullPath, IFileStream::Mode::READ);
        if (!_fileStream)
        {
            AXLOGE("Trouble with minimp3(1): {}\n", strerror(errno));
            break;
        }

        auto handle = new mp3dec_impl();

        handle->_decIO.read      = minimp3_read_r;
        handle->_decIO.seek      = minimp3_seek_r;
        handle->_decIO.read_data = handle->_decIO.seek_data = _fileStream.get();

        if (mp3dec_ex_open_cb(&handle->_dec, &handle->_decIO, MP3D_SEEK_TO_SAMPLE) != 0)
        {
            delete handle;
            break;
        }

        auto& info    = handle->_dec.info;
        _channelCount = info.channels;  // the _channelCount is samplesPerFrame
        _sampleRate   = info.hz;
#    ifndef MINIMP3_FLOAT_OUTPUT
        _sourceFormat  = AUDIO_SOURCE_FORMAT::PCM_16;
        _bytesPerBlock = sizeof(uint16_t) * _channelCount;
#    else
        _sourceFormat  = AUDIO_SOURCE_FORMAT::PCM_FLT32;
        _bytesPerBlock = sizeof(float) * _channelCount;
#    endif
        // samples
        _totalFrames = handle->_dec.samples / _channelCount;

        // store the handle
        _handle = handle;

        _isOpened = true;
        return true;
    } while (false);

    return false;
#else
    int32_t rate    = 0;
    int error       = MPG123_OK;
    int mp3Encoding = 0;
    int channel     = 0;
    do
    {
        _handle = mpg123_new(nullptr, &error);
        if (nullptr == _handle)
        {
            AXLOGE("Basic setup goes wrong: {}", mpg123_plain_strerror(error));
            break;
        }