Function get_frames_remaining

src/main/main.cpp:267–288

}

size_t get_frames_remaining() {
    constexpr float buffer_offset_frames = 1.0f;
    // Get the number of remaining buffered audio bytes.
    uint64_t buffered_byte_count = SDL_GetQueuedAudioSize(audio_device);

    // Scale the byte count based on the ratio of sample rates and channel counts.
    buffered_byte_count = buffered_byte_count * 2 * sample_rate / output_sample_rate / output_channels;

    // Adjust the reported count to be some number of refreshes in the future, which helps ensure that
    // there are enough samples even if the audio thread experiences a small amount of lag. This prevents
    // audio popping on games that use the buffered audio byte count to determine how many samples
    // to generate.
    uint32_t frames_per_vi = (sample_rate / 60);
    if (buffered_byte_count > (buffer_offset_frames * bytes_per_frame * frames_per_vi)) {
        buffered_byte_count -= (buffer_offset_frames * bytes_per_frame * frames_per_vi);
    }
    else {
        buffered_byte_count = 0;
    }
    // Convert from byte count to sample count.
    return static_cast<uint32_t>(buffered_byte_count / bytes_per_frame);
}

void update_audio_converter() {
    int ret = SDL_BuildAudioCVT(&audio_convert, AUDIO_F32, input_channels, sample_rate, AUDIO_F32, output_channels, output_sample_rate);