Method totalPitchRate

src/core/SampledAudioNode.cpp:551–582

@TODO change the interface: // if true is returned, rate_array[0] applies to the entire quantum // if the computed total rate has any illegal values, true will be returned, and a default rate of 1.f bool SampledAudioNode::totalPitchRate(ContextRenderLock& r, float*& rate);

    /// // if the computed total rate has any illegal values, true will be returned, and a default rate of 1.f
    /// bool SampledAudioNode::totalPitchRate(ContextRenderLock& r, float*& rate);
    float SampledAudioNode::totalPitchRate(ContextRenderLock& r)
    {
        std::shared_ptr<AudioBus> srcBus = m_sourceBus->valueBus();

        // if there's no bus, pitchrate is defaulted.
        if (!srcBus)
            return 1.f;

        double sampleRateFactor = sampleRateFactor = srcBus->sampleRate() / r.context()->sampleRate();

        /// @fixme these values should be per sample, not per quantum
        /// -or- they should be settings if they don't vary per sample
        double basePitchRate = playbackRate()->value();

        /// @fixme these values should be per sample, not per quantum
        double totalRate = m_dopplerRate->value() * sampleRateFactor * basePitchRate;
        totalRate *= pow(2, detune()->value() / 1200);

        // Sanity check the total rate.  It's very important that the resampler not get any bad rate values.
        totalRate = std::max(0.0, totalRate);

        // Revisit these lower bounds if ever this node can compute ultra low resampling rates.
        if (totalRate < 1.e-2f)
            totalRate = 1;  // a value of zero is considered an illegal value so the default is imposed
        totalRate = std::min(100.0, totalRate);

        bool isTotalRateValid = !std::isnan(totalRate) && !std::isinf(totalRate);
        if (!isTotalRateValid)
            totalRate = 1.0;

        return (float) totalRate;
    }

} // namespace lab