Function drmp3_init_internal

extlibs/soloud/src/audiosource/wav/dr_mp3.h:2585–2639

}

drmp3_bool32 drmp3_init_internal(drmp3* pMP3, drmp3_read_proc onRead, drmp3_seek_proc onSeek, void* pUserData, const drmp3_config* pConfig)
{
    drmp3_assert(pMP3 != NULL);
    drmp3_assert(onRead != NULL);

    // This function assumes the output object has already been reset to 0. Do not do that here, otherwise things will break.
    drmp3dec_init(&pMP3->decoder);

    // The config can be null in which case we use defaults.
    drmp3_config config;
    if (pConfig != NULL) {
        config = *pConfig;
    } else {
        drmp3_zero_object(&config);
    }

    pMP3->channels = config.outputChannels;
    if (pMP3->channels == 0) {
        pMP3->channels = DR_MP3_DEFAULT_CHANNELS;
    }

    // Cannot have more than 2 channels.
    if (pMP3->channels > 2) {
        pMP3->channels = 2;
    }

    pMP3->sampleRate = config.outputSampleRate;
    if (pMP3->sampleRate == 0) {
        pMP3->sampleRate = DR_MP3_DEFAULT_SAMPLE_RATE;
    }

    pMP3->onRead = onRead;
    pMP3->onSeek = onSeek;
    pMP3->pUserData = pUserData;

    // We need a sample rate converter for converting the sample rate from the MP3 frames to the requested output sample rate.
    drmp3_src_config srcConfig;
    drmp3_zero_object(&srcConfig);
    srcConfig.sampleRateIn = DR_MP3_DEFAULT_SAMPLE_RATE;
    srcConfig.sampleRateOut = pMP3->sampleRate;
    srcConfig.channels = pMP3->channels;
    srcConfig.algorithm = drmp3_src_algorithm_linear;
    if (!drmp3_src_init(&srcConfig, drmp3_read_src, pMP3, &pMP3->src)) {
        drmp3_uninit(pMP3);
        return DRMP3_FALSE;
    }
    
    // Decode the first frame to confirm that it is indeed a valid MP3 stream.
    if (!drmp3_decode_next_frame(pMP3)) {
        drmp3_uninit(pMP3);
        return DRMP3_FALSE; // Not a valid MP3 stream.
    }

    return DRMP3_TRUE;
}

drmp3_bool32 drmp3_init(drmp3* pMP3, drmp3_read_proc onRead, drmp3_seek_proc onSeek, void* pUserData, const drmp3_config* pConfig)
{