如何播放音频通过扬声器而不是更弱的入耳式扬声器？(How to play audio over sp

我学的核心音频。出于某种原因，处理图形的声音只能通过弱“入耳式扬声器”中扮演（当你持有设备到你的耳朵），但不超过iPhone的扬声器定期。

这是设置了音频部分的代码，但我无法看到它配置音频路径：

- (void) setupAudioSession {

    AVAudioSession *mySession = [AVAudioSession sharedInstance];

    // Specify that this object is the delegate of the audio session, so that
    //    this object's endInterruption method will be invoked when needed.
    [mySession setDelegate: self];

    // Assign the Playback category to the audio session.
    NSError *audioSessionError = nil;
    [mySession setCategory: AVAudioSessionCategoryPlayAndRecord//AVAudioSessionCategoryPlayback
                     error: &audioSessionError];

    if (audioSessionError != nil) {

        NSLog (@"Error setting audio session category.");
        return;
    }

    // Request the desired hardware sample rate.
    self.graphSampleRate = 44100.0;    // Hertz

    [mySession setPreferredHardwareSampleRate: graphSampleRate
                                        error: &audioSessionError];

    if (audioSessionError != nil) {

        NSLog (@"Error setting preferred hardware sample rate.");
        return;
    }

    // Activate the audio session
    [mySession setActive: YES
                   error: &audioSessionError];

    if (audioSessionError != nil) {

        NSLog (@"Error activating audio session during initial setup.");
        return;
    }

    // Obtain the actual hardware sample rate and store it for later use in the audio processing graph.
    self.graphSampleRate = [mySession currentHardwareSampleRate];

    // Register the audio route change listener callback function with the audio session.
    AudioSessionAddPropertyListener (
        kAudioSessionProperty_AudioRouteChange,
        audioRouteChangeListenerCallback,
        self
    );
}

在这一点核心音频你说“打过来的扬声器”与音频设备播放声音的时候？

Answer 1:

您可以使用setCategory withOption:

[mySession setCategory:AVAudioSessionCategoryPlayAndRecord withOptions:AVAudioSessionCategoryOptionDefaultToSpeaker error:&audioSessionError];

Answer 2:

我有同样的问题。原来，这是值得做的“播放和录制”类别。只需要重定向音频输出。

UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;

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

资源：

http://developer.apple.com/library/ios/#documentation/Audio/Conceptual/AudioSessionProgrammingGuide/Cookbook/Cookbook.html#//apple_ref/doc/uid/TP40007875-CH6-SW35