drain_resampler_init()

void MayaFlux::IO::AudioStreamContext::drain_resampler_init

(

)

Drain any samples buffered inside the resampler.

swr_init() and seek+flush sequences can leave delay-compensation samples inside SwrContext. Calling this discards them so that the next decode_frames() call starts from a clean resampler state. Must be called after open() and after every seek+flush pair.

Definition at line 152 of file AudioStreamContext.cpp.

{
    if (!swr_context || channels == 0)
        return;
 
    constexpr int k_drain_samples = 2048;
    uint8_t** buf = nullptr;
    int linesize = 0;
 
    int alloc = av_samples_alloc_array_and_samples(
        &buf, &linesize,
        static_cast<int>(channels), k_drain_samples,
        AV_SAMPLE_FMT_DBL, 0);
 
    if (alloc < 0 || !buf)
        return;
 
    while (swr_convert(swr_context, buf, k_drain_samples, nullptr, 0) > 0) { }
 
    av_freep(&buf[0]);
    av_freep(&buf);
}

References channels, and swr_context.

Referenced by open().

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