Ask about the "mac pro sound rendering" question

qidong liang

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Dec 4, 2021, 2:47:51 PM12/4/21

to discuss-webrtc

Reading the audio_device_mac.cc code of webrtc mac, I don’t understand why this is done? The code is as follows:

 if (_macBookProPanRight 
      && (_playChannels == 2)) {
    // Mix entirely into the right channel and zero the left channel.
    SInt32 sampleInt32 = 0;
    for (uint32_t sampleIdx = 0; sampleIdx < nOutSamples; sampleIdx += 2) {
      sampleInt32 = pPlayBuffer[sampleIdx];
      sampleInt32 += pPlayBuffer[sampleIdx + 1];
      sampleInt32 /= 2;

      if (sampleInt32 > 32767) {
        sampleInt32 = 32767;
      } else if (sampleInt32 < -32768) {
        sampleInt32 = -32768;
      }

      pPlayBuffer[sampleIdx] = 0;
      pPlayBuffer[sampleIdx + 1] = static_cast<SInt16>(sampleInt32);
    }
  }

Jozsef Vass

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Dec 15, 2021, 10:16:46 PM12/15/21

to discuss...@googlegroups.com

I am pretty sure it is done since the microphone is under the left speaker and it helps echo cancellation.

https://www.macbookproslow.com/macbook-pro-microphone-location/

Jozsef

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qidong liang

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Dec 28, 2021, 4:06:00 AM12/28/21

to discuss-webrtc

Thank you very much for your answer. I tested and found that the webrtc version used by Google Chrome is MAC pro. There is sound in both the left and right channels. Is the client for a better compatible meeting scene?

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