使用音频的背景和前景应用

问题描述

我做了一些初步测试，并且有个好主意，答案是否定的。但是只需确认一下：后台和前景应用程序可以共享音频播放设备吗？ （后台应用程序将是我的。前台应用程序将来自第三方）

I did some preliminary test and have a good idea the answer is no. But just need to confirm: Can a background and foreground app share audio playback device? (The background app will be mine. The foreground app will be from third party)

推荐答案

这是可行的，方法如下：

That is possible and here is how:

1. 通过执行以下操作，确保应用在后台播放时继续播放音频：

1. Make sure that app continues playing audio when left in background by doing this:

a）将以下内容添加到您的Info plist文件中：

a) add the following to your Info plist file:

所需的背景模式
项目0->应用播放音频

"Required background modes" "Item 0" -> "App plays audio"

b）为应用程序的AVAudioSession调用setCategory：error：

b) Call setCategory:error: for AVAudioSession of your app:

NSError * setCategoryError = nil;

NSError *setCategoryError = nil;

[[AVAudioSession sharedInstance] setCategory：AVAudioSessionCategoryPlayback错误：& setCategoryError];

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:&setCategoryError];

允许您通过调用AudioSessionSetProperty（）将音频与其他应用程序的音频混合：

Allow your audio to be mixed with audio from other apps by calling AudioSessionSetProperty():

OSStatus propertySetError = 0;

OSStatus propertySetError = 0;

UInt32 allowMixing = true;

UInt32 allowMixing = true;

propertySetError = AudioSessionSetProperty（kAudioSessionProperty_OverrideCategoryMixWithOthers，
sizeof（allowMixing），
和amp; allowMixing
）;

propertySetError = AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryMixWithOthers, sizeof (allowMixing), &allowMixing );

您需要链接针对此代码针对AVFoundation和AudioToolbox框架。

You will need to link against AVFoundation and AudioToolbox frameworks for this code.

这篇关于使用音频的背景和前景应用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！