iPhone音频:音量微弱(但耳机可以) [英] IPhone audio: Volume faint ( but okay with headphones )

问题描述

我收到了意外的音频行为:

I'm getting unexpected audio behaviour:

问题-iPhone设备的音量非常微弱，但是如果我插入耳机，则音量非常完美

1. 首先，在未插入任何内容的情况下在iPhone上启动应用.
2. 音频有效，但是它是如此微弱，确实好像是在最小音量下.但已达到最大音量.
3. 现在我插入了耳机.全量.很棒！
4. 拔下耳机.转到(2)

无论是否插入耳机都没关系.这似乎是一个不相关的问题

It doesn't matter whether I start with the headphones plugged in or not. It seems to be an unrelated problem

此行为是我的应用程序所特有的.我已经尝试过Apple的AVTouch示例，无论是否戴耳机，此举都能正常工作.

this behaviour is peculiar to my app. I have tried Apple's AVTouch sample, and this behaves correctly with and without headphones.

推荐答案

wooHoo！

// kAudioSessionOverrideAudioRoute_Speaker would only work once.  
// kAudioSessionProperty_OverrideCategoryDefaultToSpeaker works
//     until the session changes.
SET_PROPERTY( kAudioSessionProperty_OverrideCategoryDefaultToSpeaker,        UInt32,   (UInt32) YES );

基本上，iPhone有2个内置扬声器，接收器"在接听电话时会卡在您的耳朵上，还有一个更大的外接扬声器(这2个格栅在电源插槽的两侧，左侧是外接扬声器)扬声器，最合适的扬声器是麦克风-令人困惑:我曾经将iPhone送到泰国的一家维修店，因为我的正确的扬声器"无法正常工作，他们甚至愿意为我修理它?！幸运的是，我没有就像价格...)

basically the iPhone has 2 internal speakers, the ' receiver ' which jams up against your ear when you receive a call, and a far bigger external speaker ( those 2 grills either side of the power slot, the left one is the external speaker, the right one is the mic -- confusing: I once took my iPhone to a repair shop in Thailand because my ' right speaker ' wasn't functioning, and they even offered to fix it for me?! luckily I didn't like the price... )

无论如何，我绝对没有充分的理由想到

anyway, for absolutely no good reason I can think of, the

SET_PROPERTY( kAudioSessionProperty_AudioCategory,  UInt32,  
                 kAudioSessionCategory_PlayAndRecord );

会话默认使用接收器，因此只需要告诉它使用扬声器即可.

session defaults to using the receiver, so it just needs to be told to use the speaker instead.

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