Method Process

libraries/lib-mixer/Mix.cpp:295–342

}

size_t Mixer::Process(const size_t maxToProcess)
{
   assert(maxToProcess <= BufferSize());

   // MB: this is wrong! mT represented warped time, and mTime is too inaccurate to use
   // it here. It's also unnecessary I think.
   //if (mT >= mT1)
   //   return 0;

   auto &[mT0, mT1, _, mTime] = *mTimesAndSpeed;
   auto oldTime = mTime;
   // backwards (as possibly in scrubbing)
   const auto backwards = (mT0 > mT1);

   Clear();

   std::optional<size_t> maxOut;
   
   maxOut = mDownstream->Acquire(mTemp, maxToProcess);
   mDownstream->Release();

   if (!maxOut)
      return 0;

   if (backwards)
      mTime = std::clamp(mTime, mT1, oldTime);
   else
      mTime = std::clamp(mTime, oldTime, mT1);

   const auto dstStride = (mInterleaved ? mNumChannels : 1);
   auto ditherType = mNeedsDither
      ? (mHighQuality ? gHighQualityDither : gLowQualityDither)
      : DitherType::none;
   for (size_t c = 0; c < mNumChannels; ++c)
      CopySamples(mTemp.GetReadPosition(c), floatSample,
         (mInterleaved
            ? mBuffer[0].ptr() + (c * SAMPLE_SIZE(mFormat))
            : mBuffer[c].ptr()
         ),
         mFormat, *maxOut, ditherType,
         1, dstStride);

   // MB: this doesn't take warping into account, replaced with code based on mSamplePos
   //mT += (maxOut / mRate);

   assert(*maxOut <= maxToProcess);
   return *maxOut;
}

constSamplePtr Mixer::GetBuffer()
{