如何在不使用AudioSessionSetProperty的情况下将音频路由到扬声器？ [英] How Do I Route Audio to Speaker without using AudioSessionSetProperty?

问题描述

由于 AudioSessionSetProperty 可能会变成已弃用，我正在尝试查找如何将音频路由到的代码示例发言人使用其他方式。

As AudioSessionSetProperty may become deprecated, I'm trying to find an code example of how to route audio to the speaker using other means.

之前我做了以下事情：

-(void)setSpeakerEnabled
{
    debugLog(@"%s",__FUNCTION__);
    UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;

    AudioSessionSetProperty (
                         kAudioSessionProperty_OverrideAudioRoute,
                         sizeof (audioRouteOverride),
                         &audioRouteOverride
                         );
}

尝试获得相同的结果，但没有通话到 AudioSessionSetProperty 。

Trying to get same result but without call to AudioSessionSetProperty.

推荐答案

在每个版本的iOS，更多的audioSession属性被迁移到AVFoundation，因此您应该在可用时优先使用这些属性。

On each release of iOS, more of the audioSession properties are migrated to AVFoundation, so you should use those in preference whenever available.

由于iOS 6 kAudioSessionProperty_OverrideAudioRoute 通过方法在AVAudioSession中表示

Since iOS 6 kAudioSessionProperty_OverrideAudioRoute is represented in AVAudioSession by the method

- (BOOL)overrideOutputAudioPort:error:

可用值 AVAudioSessionPortOverrideNone 和 AVAudioSessionPortOverrideSpeaker

这是一个完全通过AVFoundation配置的示例音频会话：

Here is an example audio session configured entirely via AVFoundation:

 - (void)configureAVAudioSession
{
   // Get your app's audioSession singleton object
    AVAudioSession *session = [AVAudioSession sharedInstance];

    // Error handling
    BOOL success;
    NSError *error;

    // set the audioSession category. 
    // Needs to be Record or PlayAndRecord to use audioRouteOverride:  

    success = [session setCategory:AVAudioSessionCategoryPlayAndRecord
                             error:&error];

   if (!success) {
       NSLog(@"AVAudioSession error setting category:%@",error);
   }

    // Set the audioSession override
    success = [session overrideOutputAudioPort:AVAudioSessionPortOverrideSpeaker
                                          error:&error];
    if (!success) {
        NSLog(@"AVAudioSession error overrideOutputAudioPort:%@",error);
    }

    // Activate the audio session
    success = [session setActive:YES error:&error];
    if (!success) {
        NSLog(@"AVAudioSession error activating: %@",error);
    }
    else {
         NSLog(@"AudioSession active");
    }

}

UPDATE

自iOS 7.0起，音频会话服务C API现已完全弃用，转而支持AVAudioSession。

Since iOS 7.0, the Audio Session Services C API is now fully deprecated in favour of AVAudioSession.

更新2

- (BOOL)overrideOutputAudioPort:error:  

是一个方法，而不是属性，它设置了一个底层的只写 UInt32值。您无法获取当前值，您应该将该方法视为设置临时状态。如果音频路由更改或中断，该属性将重置为其默认值（ AVAudioSessionPortOverrideNone ）。您可以通过 AVAudioSessionDelegate 获得中断通知。

is a method, not a property, and it sets an underlying write-only UInt32 value. You can't get the current value, and you should treat the method as setting a temporary state. If the audio route changes or is interrupted, the property resets to its default (AVAudioSessionPortOverrideNone). You can get interruption notifications via AVAudioSessionDelegate.

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