Method playSample

src/engine/AudioEngine.cpp:535–617

}

std::weak_ptr<Effect> Xaudio2Implementation::playSample(IXAudio2SubmixVoice * submix, EffectDesc const & desc)
{
    std::weak_ptr<Effect> result;

    if (!canPlaySample(desc.sample))
        return result;

    uint32_t key = makeKey(desc.sample);

    WAVEFORMATEX wfx;
    getFormatEX(desc.sample, &wfx);

    std::lock_guard<std::mutex> guard(m_voicePoolMutex);

    if (IXAudio2SourceVoice * voice = allocateVoice(key, wfx))
    {
        HRESULT hr;
        if (FAILED(hr = voice->SetSourceSampleRate(desc.sample->sampleRate)))
        {
#ifdef _DEBUG
            // manuelk : not sure why sometimes Xaudio2 returns XAUDIO2_E_INVALID_CALL here
            // when queuing many effects too quickly - setting to fail silently in release mode
            log::warning("AudioEngine : failed to set sample rate for audio sample (%08x)", hr);
#endif
            return result;
        }

        if (!setOutputVoice(submix, voice))
            return result;

        XAUDIO2_BUFFER buffer = { 0 };
        buffer.pAudioData = (BYTE const *)desc.sample->samples;
        buffer.Flags = XAUDIO2_END_OF_STREAM;
        buffer.AudioBytes = desc.sample->samplesSize;
        buffer.LoopCount = desc.loop == 1 ? XAUDIO2_NO_LOOP_REGION : std::min(desc.loop, (uint32_t)XAUDIO2_LOOP_INFINITE);

        if (voice->SubmitSourceBuffer(&buffer) != S_OK) {
            log::warning("AudioEngine : error SubmitSourceBuffer");
            return result;
        }

        if (desc.volume!=1.f)
            voice->SetVolume(desc.volume);
        if (desc.pitch!=1.f)
            voice->SetFrequencyRatio(desc.pitch);
        if (desc.pan != 0.f)
            applyPan(desc.pan, voice, desc.sample->nchannels);

        if (FAILED(hr = voice->Start(0)))
        {
            log::warning("Error starting voice for audio sample");
            return result;
        }

        std::shared_ptr<Xaudio2Effect> effect;

        if (!m_options.use3D || !desc.transform)
            effect = std::make_shared<Xaudio2Effect>();