| Index: webrtc/modules/audio_coding/main/acm2/rent_a_codec.cc
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| diff --git a/webrtc/modules/audio_coding/main/acm2/rent_a_codec.cc b/webrtc/modules/audio_coding/main/acm2/rent_a_codec.cc
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| index 328181428bb6bc4eb7af21188222615915b20344..b31092cb1129427ac05a495b4966797a081dc733 100644
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| --- a/webrtc/modules/audio_coding/main/acm2/rent_a_codec.cc
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| +++ b/webrtc/modules/audio_coding/main/acm2/rent_a_codec.cc
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| @@ -259,7 +259,8 @@ AudioEncoder* RentACodec::RentEncoderStack(AudioEncoder* speech_encoder,
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|                           : rtc::Optional<int>(it->second);
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|    };
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|    auto cng_pt = pt(param->cng_payload_types);
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| -  param->use_cng = param->use_cng && cng_pt;
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| +  param->use_cng =
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| +      param->use_cng && cng_pt && speech_encoder->NumChannels() == 1;
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|    auto red_pt = pt(param->red_payload_types);
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|    param->use_red = param->use_red && red_pt;
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|  
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| 
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