环境信息 #

• 设备：Hotwav R8平板（Unisoc八核芯片、4GB内存）
• 系统：Android 14（API 34）
• Linphone SDK版本：5.4.5

已尝试的解决方法 #

• 使用Android AudioManager处理回声，无效果
• 调用Linphone core.config设置回声相关参数、调整麦克风增益至0.01f，均无变化；仅能关闭麦克风，无法修改增益
• 将配置代码放在Call.State.StreamsRunning回调中，确保通话启动时生效，但日志显示代码执行后麦克风增益仍未改变

测试情况 #

• 平板发起通话，被叫方静音后，10英尺外声音仍被平板麦克风拾取，被叫方音量无变化
• 关闭平板麦克风后回声消失，无声音传输
• 被叫方在30英尺外（平板无拾音可能）时，仍出现回声
• 封住平板两个麦克风及扬声器后，被叫方听不到平板声音但回声仍存在，且被叫设备靠近平板时仍会触发反馈回路
• Logcat无报错信息

已投入3个月适配该硬件开发门禁定制软件，希望找到软件解决方案而非更换设备。相关配置代码如下：

fun start

///////////////////\

// --- THE FIX FOR MANUAL GAIN CONTROL ---
// We MUST disable system processing for the 'mic_gain' config to be respected.
config.setBool("sound", "android_audio_processing_allowed", false) 

// Because we disabled hardware processing, we enable Linphone's software AEC
config.setBool("sound", "echo_cancellation", true)
config.setBool("sound", "echo_limiter", true)

// Now the 0.01 setting will actually be applied by the SDK's software mixer
config.setBool("sound", "agc", false) 
config.setFloat("sound", "mic_gain", 0.01f) 
config.setFloat("sound", "playback_gain", 1.0f) 

config.setString("sound", "audio_backend", "opensles")
config.setInt("sound", "android_stream", 0) 

/////////////////\

Call.State.StreamsRunning -> {
                        _callState.value = CallStatus.Connected
                        audioManager.mode = AudioManager.MODE_IN_COMMUNICATION
                        setSpeakerphoneOn(audioManager, true)

                        val maxVol = audioManager.getStreamMaxVolume(AudioManager.STREAM_VOICE_CALL)

                        core.activateAudioSession(true) //linphone

                        core.isMicEnabled = true //linphone
                        core.config.setFloat("sound", "echo_cancellation", 1f)//linphone
                        core.config.setFloat("sound", "mic_gain", 0.01f)//linphone

                         Log.i("[SipCallManager]", "Call connected. Software AEC and 0.01 Mic Gain forced.")
                    }

内容的提问来源于stack exchange，提问作者Monica Martino