From 17859a3c99c8828b8de1f9e8835591f57637fbb9 Mon Sep 17 00:00:00 2001
From: peng <peng@example.com>
Date: Mon, 14 Sep 2020 16:23:47 +0800
Subject: [PATCH] audio_quality_enhancement

---
 src/sdk/base/mediastream-factory.js | 21 ++++++++++++++++++++-
 src/sdk/base/sdputils.js            | 24 ++++++++++++++++++++++++
 src/sdk/conference/channel.js       |  2 ++
 3 files changed, 46 insertions(+), 1 deletion(-)

diff --git a/src/sdk/base/mediastream-factory.js b/src/sdk/base/mediastream-factory.js
index a579041f..0099ec47 100644
--- a/src/sdk/base/mediastream-factory.js
+++ b/src/sdk/base/mediastream-factory.js
@@ -177,7 +177,26 @@ export class MediaStreamFactory {
       }
     } else {
       if (constraints.audio.source === MediaFormatModule.AudioSourceInfo.SCREENCAST) {
-        mediaConstraints.audio = true;
+       mediaConstraints.audio = {};
+       if (constraints.audio.echoCancellation === false) {
+           mediaConstraints.audio.echoCancellation = constraints.audio.echoCancellation;
+         }
+       if (constraints.audio.autoGainControl === false) {
+           mediaConstraints.audio.autoGainControl = constraints.audio.autoGainControl;
+         }
+       if (constraints.audio.noiseSuppression === false) {
+           mediaConstraints.audio.noiseSuppression = constraints.audio.noiseSuppression;
+         }
+       if (constraints.audio.channelCount) {
+           mediaConstraints.audio.channelCount = constraints.audio.channelCount;
+         }
+       if (constraints.audio.sampleRate) {
+          mediaConstraints.audio.sampleRate = constraints.audio.sampleRate;
+         }
+       if (!constraints.audio.echoCancellation && !constraints.audio.autoGainControl && !constraints.audio.noiseSuppression && !constraints.audio.channelCount && !constraints.audio.sampleRate) {
+           mediaConstraints.audio = true;
+         }
+
       } else {
         mediaConstraints.audio = constraints.audio;
       }
diff --git a/src/sdk/base/sdputils.js b/src/sdk/base/sdputils.js
index ef1a9251..34ad1410 100644
--- a/src/sdk/base/sdputils.js
+++ b/src/sdk/base/sdputils.js
@@ -685,6 +685,30 @@ export function addLegacySimulcast(sdp, type, numStreams) {
   return sdp;
 }
 
+export function setOpusParam(sdp, audioOptions) {
+    let maxAverageBitrateKB;
+    if(audioOptions.__proto__  === Array.prototype){
+      if(audioOptions[0].maxAverageBitrate !== undefined){
+        maxAverageBitrateKB = audioOptions[0].maxAverageBitrate*1000;
+        sdp = setCodecParam(
+           sdp, 'opus/48000', 'maxaveragebitrate', maxAverageBitrateKB);
+      }
+      if(audioOptions[0].stereo && audioOptions[0].stereo === true){
+        sdp = maybeSetOpusOptions(sdp, {
+           opusStereo: 'true'
+      });
+     }
+    }
+    else{
+        if(audioOptions.stereo && audioOptions.stereo === true){
+            sdp = maybeSetOpusOptions(sdp, {
+               opusStereo: 'true'
+          });
+         }
+    }
+    return sdp;
+  }
+
 export function setMaxBitrate(sdp, encodingParametersList) {
   for (const encodingParameters of encodingParametersList) {
     if (encodingParameters.maxBitrate) {
diff --git a/src/sdk/conference/channel.js b/src/sdk/conference/channel.js
index cd41f1a1..056f29c7 100644
--- a/src/sdk/conference/channel.js
+++ b/src/sdk/conference/channel.js
@@ -732,10 +732,12 @@ export class ConferencePeerConnectionChannel extends EventDispatcher {
       return sdp;
     }
     sdp = this._setMaxBitrate(sdp, options);
+    sdp = SdpUtils.setOpusParam(sdp, options.audio);
     return sdp;
   }
 
   _setRtpReceiverOptions(sdp, options) {
+    sdp = SdpUtils.setOpusParam(sdp, options.audio);
     // Add legacy simulcast in SDP for safari.
     if (this._isRtpEncodingParameters(options.video) && Utils.isSafari()) {
       if (options.video.length > 1) {