Method seek

src/SFML/Audio/SoundFileReaderFlac.cpp:331–357

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void SoundFileReaderFlac::seek(std::uint64_t sampleOffset)
{
    assert(m_decoder && "No decoder available. Call SoundFileReaderFlac::open() to create a new one.");

    // Reset the callback data (the "write" callback will be called)
    m_clientData.buffer    = nullptr;
    m_clientData.remaining = 0;
    m_clientData.leftovers.clear();

    // FLAC decoder expects absolute sample offset, so we take the channel count out
    if (sampleOffset < m_clientData.info.sampleCount)
    {
        // The "write" callback will populate the leftovers buffer with the first batch of samples from the
        // seek destination, and since we want that data in this typical case, we don't re-clear it afterward
        FLAC__stream_decoder_seek_absolute(m_decoder.get(), sampleOffset / m_clientData.info.channelCount);
    }
    else
    {
        // FLAC decoder can't skip straight to EOF, so we short-seek by one sample and skip the rest
        FLAC__stream_decoder_seek_absolute(m_decoder.get(),
                                           (m_clientData.info.sampleCount / m_clientData.info.channelCount) - 1);
        FLAC__stream_decoder_skip_single_frame(m_decoder.get());

        // This was re-populated during the seek, but we're skipping everything in this, so we need it emptied
        m_clientData.leftovers.clear();
    }
}


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