From c802017a0a35503b68a48dd806460819fa27124a Mon Sep 17 00:00:00 2001
From: Hiroshi Horie <548776+hiroshihorie@users.noreply.github.com>
Date: Sun, 13 Mar 2022 02:41:42 +0900
Subject: [PATCH] remove mbp pan right code

---
 modules/audio_device/mac/audio_device_mac.cc | 93 +-------------------
 1 file changed, 1 insertion(+), 92 deletions(-)

diff --git a/modules/audio_device/mac/audio_device_mac.cc b/modules/audio_device/mac/audio_device_mac.cc
index e0d4419c81..29ffb457d1 100644
--- a/modules/audio_device/mac/audio_device_mac.cc
+++ b/modules/audio_device/mac/audio_device_mac.cc
@@ -138,8 +138,6 @@ AudioDeviceMac::AudioDeviceMac()
       _twoDevices(true),
       _doStop(false),
       _doStopRec(false),
-      _macBookPro(false),
-      _macBookProPanRight(false),
       _captureLatencyUs(0),
       _renderLatencyUs(0),
       _captureDelayUs(0),
@@ -313,23 +311,6 @@ AudioDeviceGeneric::InitStatus AudioDeviceMac::Init() {
   WEBRTC_CA_LOG_ERR(AudioObjectAddPropertyListener(
       kAudioObjectSystemObject, &propertyAddress, &objectListenerProc, this));
 
-  // Determine if this is a MacBook Pro
-  _macBookPro = false;
-  _macBookProPanRight = false;
-  char buf[128];
-  size_t length = sizeof(buf);
-  memset(buf, 0, length);
-
-  int intErr = sysctlbyname("hw.model", buf, &length, NULL, 0);
-  if (intErr != 0) {
-    RTC_LOG(LS_ERROR) << "Error in sysctlbyname(): " << err;
-  } else {
-    RTC_LOG(LS_VERBOSE) << "Hardware model: " << buf;
-    if (strncmp(buf, "MacBookPro", 10) == 0) {
-      _macBookPro = true;
-    }
-  }
-
   _initialized = true;
 
   return InitStatus::OK;
@@ -996,34 +977,8 @@ int32_t AudioDeviceMac::InitPlayout() {
   _renderDeviceIsAlive = 1;
   _doStop = false;
 
-  // The internal microphone of a MacBook Pro is located under the left speaker
-  // grille. When the internal speakers are in use, we want to fully stereo
-  // pan to the right.
   AudioObjectPropertyAddress propertyAddress = {
       kAudioDevicePropertyDataSource, kAudioDevicePropertyScopeOutput, 0};
-  if (_macBookPro) {
-    _macBookProPanRight = false;
-    Boolean hasProperty =
-        AudioObjectHasProperty(_outputDeviceID, &propertyAddress);
-    if (hasProperty) {
-      UInt32 dataSource = 0;
-      size = sizeof(dataSource);
-      WEBRTC_CA_LOG_WARN(AudioObjectGetPropertyData(
-          _outputDeviceID, &propertyAddress, 0, NULL, &size, &dataSource));
-
-      if (dataSource == 'ispk') {
-        _macBookProPanRight = true;
-        RTC_LOG(LS_VERBOSE)
-            << "MacBook Pro using internal speakers; stereo panning right";
-      } else {
-        RTC_LOG(LS_VERBOSE) << "MacBook Pro not using internal speakers";
-      }
-
-      // Add a listener to determine if the status changes.
-      WEBRTC_CA_LOG_WARN(AudioObjectAddPropertyListener(
-          _outputDeviceID, &propertyAddress, &objectListenerProc, this));
-    }
-  }
 
   // Get current stream description
   propertyAddress.mSelector = kAudioDevicePropertyStreamFormat;
@@ -1528,16 +1483,6 @@ int32_t AudioDeviceMac::StopPlayout() {
   WEBRTC_CA_LOG_WARN(AudioObjectRemovePropertyListener(
       _outputDeviceID, &propertyAddress, &objectListenerProc, this));
 
-  if (_macBookPro) {
-    Boolean hasProperty =
-        AudioObjectHasProperty(_outputDeviceID, &propertyAddress);
-    if (hasProperty) {
-      propertyAddress.mSelector = kAudioDevicePropertyDataSource;
-      WEBRTC_CA_LOG_WARN(AudioObjectRemovePropertyListener(
-          _outputDeviceID, &propertyAddress, &objectListenerProc, this));
-    }
-  }
-
   _playIsInitialized = false;
   _playing = false;
 
@@ -2076,28 +2021,10 @@ int32_t AudioDeviceMac::HandleStreamFormatChange(
 int32_t AudioDeviceMac::HandleDataSourceChange(
     const AudioObjectID objectId,
     const AudioObjectPropertyAddress propertyAddress) {
-  OSStatus err = noErr;
-
-  if (_macBookPro &&
-      propertyAddress.mScope == kAudioDevicePropertyScopeOutput) {
-    RTC_LOG(LS_VERBOSE) << "Data source changed";
-
-    _macBookProPanRight = false;
-    UInt32 dataSource = 0;
-    UInt32 size = sizeof(UInt32);
-    WEBRTC_CA_RETURN_ON_ERR(AudioObjectGetPropertyData(
-        objectId, &propertyAddress, 0, NULL, &size, &dataSource));
-    if (dataSource == 'ispk') {
-      _macBookProPanRight = true;
-      RTC_LOG(LS_VERBOSE)
-          << "MacBook Pro using internal speakers; stereo panning right";
-    } else {
-      RTC_LOG(LS_VERBOSE) << "MacBook Pro not using internal speakers";
-    }
-  }
 
   return 0;
 }
+
 int32_t AudioDeviceMac::HandleProcessorOverload(
     const AudioObjectPropertyAddress propertyAddress) {
   // TODO(xians): we probably want to notify the user in some way of the
@@ -2415,24 +2342,6 @@ bool AudioDeviceMac::RenderWorkerThread() {
   uint32_t nOutSamples = nSamples * _outDesiredFormat.mChannelsPerFrame;
 
   SInt16* pPlayBuffer = (SInt16*)&playBuffer;
-  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);
-    }
-  }
 
   PaUtil_WriteRingBuffer(_paRenderBuffer, pPlayBuffer, nOutSamples);