前一陣做音視頻會(huì)議，底層用webRTC實(shí)現(xiàn)的，音頻通話(huà)實(shí)現(xiàn)揚(yáng)聲器和聽(tīng)筒切換時(shí)遇到了不少問(wèn)題，查了很多的資料的，但都不能很好的實(shí)現(xiàn)揚(yáng)聲器和聽(tīng)筒的切換，下面寫(xiě)一下我們最后的實(shí)現(xiàn)方案，供跟我一樣正在研究聽(tīng)筒和揚(yáng)聲器切換的程序員參考指正，然而，雖然實(shí)現(xiàn)了基本功能，但還是存在一定的問(wèn)題，希望大家能給出好的建議。下面直接上程序代碼：

//監(jiān)聽(tīng)聲道的變化
- (void)observeHeadset {
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(roteChange:) name:AVAudioSessionRouteChangeNotification object:nil];
}

- (void)roteChange:(NSNotification *)noti {
    if (![self isHeadPhoneEnable]) {//沒(méi)有耳機(jī)根據(jù)當(dāng)前狀態(tài)切換
        if (self.isSpeaker) {
            [self switchAudioCategaryWithSpeaker:YES];
        } else {
           [self switchAudioCategaryWithSpeaker:NO];
        }
    } else {//有耳機(jī)走聽(tīng)筒
       [self switchAudioCategaryWithSpeaker:NO];
    }
}

- (BOOL)isHeadPhoneEnable {//判斷是否插入耳機(jī)
    AVAudioSessionRouteDescription *route = [[AVAudioSession sharedInstance] currentRoute];
    BOOL isHeadPhoneEnable = NO;
    for (AVAudioSessionPortDescription *desc in [route outputs]) {
        if ([[desc portType] isEqualToString:AVAudioSessionPortHeadphones]) {
            isHeadPhoneEnable = YES;
        }
    }
    return isHeadPhoneEnable;
}
//揚(yáng)聲器和聽(tīng)筒的切換
- (void)switchAudioCategaryWithSpeaker:(BOOL)isSpeaker {
    AVAudioSession* audioSession = [AVAudioSession sharedInstance];
    if (isSpeaker) {
        [[UIDevice currentDevice] setProximityMonitoringEnabled:NO];
        [audioSession overrideOutputAudioPort:AVAudioSessionPortOverrideSpeaker error:nil];
    } else {
        [[UIDevice currentDevice] setProximityMonitoringEnabled:YES];
        [audioSession overrideOutputAudioPort:AVAudioSessionPortOverrideNone error:nil];
    }
}

每次點(diǎn)擊按鈕切換揚(yáng)聲器和聽(tīng)筒時(shí)，調(diào)用- (void)switchAudioCategaryWithSpeaker:(BOOL)isSpeaker方法對(duì)揚(yáng)聲器和聽(tīng)筒進(jìn)行切換，但此時(shí)的切換好像并沒(méi)有真正的生效，而是通過(guò)系統(tǒng)的通知，監(jiān)聽(tīng)到roteChange:然后進(jìn)行揚(yáng)聲器和聽(tīng)筒的實(shí)現(xiàn)真正切換。猜測(cè)是因?yàn)閣ebRTC的底層對(duì)音頻做了操作，但沒(méi)有仔細(xì)的去研究webRTC底層的代碼，如果有什么問(wèn)題歡迎大家批評(píng)指正，謝謝。