blocks|key|3141878|text|目前，操作系统只允许应用程序一次连接到一个音频源路由。在库存iOS设备上记录2通道的唯一方法是使用连接器(旧型号的相机连接工具包)和标准的USB立体声ADC或具有多个麦克风输入的音频混合面板。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3141879|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

The OS currently only allows an app to connect to one audio source route at a time. The only way to record 2-channels on a stock iOS device is by using an Apple USB to Lightning connector (Camera Connection kit on older models) with a standard USB stereo ADC or an audio mixing panel which has multiple mic inputs.

blocks|key|2451786|text|我在Apple库中找到了一些关于如何从不同的麦克风端口选择数据源的常见问题，这些可能会有所帮助：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2451787|index.html|offset|length|2451788|iOS+7在选择特定内置麦克风方面为开发人员提供了更大的灵活性。
使用iOS+7中引入的API，开发人员可以执行以下任务:定位表示内置麦克风的端口描述、定位特定的麦克风(如“前端”、“后”或“底部”)、设置您选择的麦克风作为首选数据源、将内置麦克风端口设置为首选输入，甚至在硬件支持的情况下选择首选麦克风极性模式。见AVAudioSession.h.
|blockquote|2451789|2451790|清单1演示了应用程序如何找到表示内置麦克风的AVAudioSessionPortDescription，定位前端麦克风(在iPhone+5或具有前置麦克风的其他设备上)，将前端麦克风设置为首选数据源，并将内置麦克风端口设置为首选输入。|2451791|清单1演示了输入选择。|2451792|#import+<AVFoundation/AVAudioSession.h>
-+(void)+demonstrateInputSelection
{
++++NSError*+theError+=+nil;
++++BOOL+result+=+YES;
++++AVAudioSession*+myAudioSession+=+[AVAudioSession+sharedInstance];
++++result+=+[myAudioSession+setCategory:AVAudioSessionCategoryPlayAndRecord+error:&theError];
++++if+(!result)
++++{
++++++++NSLog(@"setCategory+failed");
++++}
++++result+=+[myAudioSession+setActive:YES+error:&theError];
++++if+(!result)
++++{
++++++++NSLog(@"setActive+failed");
++++}
++++//+Get+the+set+of+available+inputs.+If+there+are+no+audio+accessories+attached,+there+will+be
++++//+only+one+available+input+--+the+built+in+microphone.
++++NSArray*+inputs+=+[myAudioSession+availableInputs];
++++//+Locate+the+Port+corresponding+to+the+built-in+microphone.
++++AVAudioSessionPortDescription*+builtInMicPort+=+nil;
++++for+(AVAudioSessionPortDescription*+port+in+inputs)
++++{
++++++++if+([port.portType+isEqualToString:AVAudioSessionPortBuiltInMic])
++++++++{
++++++++++++builtInMicPort+=+port;
++++++++++++break;
++++++++}
++++}
++++//+Print+out+a+description+of+the+data+sources+for+the+built-in+microphone
++++NSLog(@"There+are+%25u+data+sources+for+port+:\"%25@\"",+(unsigned)[builtInMicPort.dataSources+count],+builtInMicPort);
++++NSLog(@"%25@",+builtInMicPort.dataSources);
++++//+loop+over+the+built-in+mic's+data+sources+and+attempt+to+locate+the+front+microphone
++++AVAudioSessionDataSourceDescription*+frontDataSource+=+nil;
++++for+(AVAudioSessionDataSourceDescription*+source+in+builtInMicPort.dataSources)
++++{
++++++++if+([source.orientation+isEqual:AVAudioSessionOrientationFront])
++++++++{
++++++++++++frontDataSource+=+source;
++++++++++++break;
++++++++}
++++}+//+end+data+source+iteration
++++if+(frontDataSource)
++++{
++++++++NSLog(@"Currently+selected+source+is+\"%25@\"+for+port+\"%25@\"",+builtInMicPort.selectedDataSource.dataSourceName,+builtInMicPort.portName);
++++++++NSLog(@"Attempting+to+select+source+\"%25@\"+on+port+\"%25@\"",+frontDataSource,+builtInMicPort.portName);
++++++++//+Set+a+preference+for+the+front+data+source.
++++++++theError+=+nil;
++++++++result+=+[builtInMicPort+setPreferredDataSource:frontDataSource+error:&theError];
++++++++if+(!result)
++++++++{
++++++++++++//+an+error+occurred.+Handle+it!
++++++++++++NSLog(@"setPreferredDataSource+failed");
++++++++}
++++}
++++//+Make+sure+the+built-in+mic+is+selected+for+input.+This+will+be+a+no-op+if+the+built-in+mic+is
++++//+already+the+current+input+Port.
++++theError+=+nil;
++++result+=+[myAudioSession+setPreferredInput:builtInMicPort+error:&theError];
++++if+(!result)
++++{
++++++++//+an+error+occurred.+Handle+it!
++++++++NSLog(@"setPreferredInput+failed");
++++}
}|code-block|syntax|javascript|2451793|清单1将在iPhone+5上运行时生成以下控制台输出：|2451794|There+are+3+data+sources+for+port+:"<AVAudioSessionPortDescription:+0x14d935a0,+type+=+MicrophoneBuiltIn;+name+=+iPhone+Microphone;+UID+=+Built-In+Microphone;+selectedDataSource+=+Bottom>"
(
++++"<AVAudioSessionDataSourceDescription:+0x14d93800,+ID+=+1835216945;+name+=+Bottom>",
++++"<AVAudioSessionDataSourceDescription:+0x14d938d0,+ID+=+1835216946;+name+=+Front>",
++++"<AVAudioSessionDataSourceDescription:+0x14d93a10,+ID+=+1835216947;+name+=+Back>"
)
Currently+selected+source+is+"Bottom"+for+port+"iPhone+Microphone"
Attempting+to+select+source+"<AVAudioSessionDataSourceDescription:+0x14d938d0,+ID+=+1835216946;+name+=+Front>"+on+port+"iPhone+Microphone”|2451795|UPDATE+14+Nov|style|CODE|2451796|使用前面的代码，我可以在iPhone上设置特定的内置麦克风来录制声音，现在我正在尝试频繁地更改iPhone上的特定麦克风，以模拟立体声唱片。|2451797|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.apple.com/library/ios/qa/qa1799/_index.html^0|0|0|A|0|0|0|0|0|0|0|0|0|0|D|0|0^^$0|@$1|2|3|4|5|6|7|1A|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1B|8|@]|9|@$D|1C|E|1D|1|1E]]|A|$]]|$1|F|3|G|5|H|7|1F|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|1H|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|1I|8|@]|9|@]|A|$]]|$1|N|3|O|5|P|7|1J|8|@]|9|@]|A|$Q|R]]|$1|S|3|T|5|6|7|1K|8|@]|9|@]|A|$]]|$1|U|3|V|5|P|7|1L|8|@]|9|@]|A|$Q|R]]|$1|W|3|X|5|6|7|1M|8|@$D|1N|E|1O|Y|Z]]|9|@]|A|$]]|$1|10|3|11|5|6|7|1P|8|@]|9|@]|A|$]]|$1|12|3|-4|5|6|7|1Q|8|@]|9|@]|A|$]]]|13|$14|$5|15|16|17|A|$18|19]]]]

I have found some FAQ on Apple library about how to choose data source from different microphone port, maybe these will be helpful:
<a href="https://developer.apple.com/library/ios/qa/qa1799/_index.html" rel="nofollow noreferrer">https://developer.apple.com/library/ios/qa/qa1799/_index.html</a>
<blockquote>
iOS 7 offers developers more flexibility in terms of selecting specific built-in microphones.
Using APIs introduced in iOS 7, developers can perform tasks such as locating a port description that represents the built-in microphone, locating specific microphones like the &quot;front&quot;, &quot;back&quot; or &quot;bottom&quot;, setting your choice of microphone as the preferred data source, setting the built-in microphone port as the preferred input and even selecting a preferred microphone polar pattern if the hardware supports it. See AVAudioSession.h.
</blockquote>
Listing 1 demonstrates how applications can find the AVAudioSessionPortDescription that represents the built-in microphone, locate the front microphone (on iPhone 5 or another device that has a front facing microphone), set the front microphone as the preferred data source and set the built-in microphone port as the preferred input.
Listing 1  Demonstrate Input Selection.
<pre><code>#import &lt;AVFoundation/AVAudioSession.h&gt;
- (void) demonstrateInputSelection
{
 NSError* theError = nil;
 BOOL result = YES;
 AVAudioSession* myAudioSession = [AVAudioSession sharedInstance];
 result = [myAudioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:&amp;theError];
 if (!result)
 {
 NSLog(@&quot;setCategory failed&quot;);
 }
 result = [myAudioSession setActive:YES error:&amp;theError];
 if (!result)
 {
 NSLog(@&quot;setActive failed&quot;);
 }
 // Get the set of available inputs. If there are no audio accessories attached, there will be
 // only one available input -- the built in microphone.
 NSArray* inputs = [myAudioSession availableInputs];
 // Locate the Port corresponding to the built-in microphone.
 AVAudioSessionPortDescription* builtInMicPort = nil;
 for (AVAudioSessionPortDescription* port in inputs)
 {
 if ([port.portType isEqualToString:AVAudioSessionPortBuiltInMic])
 {
 builtInMicPort = port;
 break;
 }
 }
 // Print out a description of the data sources for the built-in microphone
 NSLog(@&quot;There are %u data sources for port :\&quot;%@\&quot;&quot;, (unsigned)[builtInMicPort.dataSources count], builtInMicPort);
 NSLog(@&quot;%@&quot;, builtInMicPort.dataSources);
 // loop over the built-in mic's data sources and attempt to locate the front microphone
 AVAudioSessionDataSourceDescription* frontDataSource = nil;
 for (AVAudioSessionDataSourceDescription* source in builtInMicPort.dataSources)
 {
 if ([source.orientation isEqual:AVAudioSessionOrientationFront])
 {
 frontDataSource = source;
 break;
 }
 } // end data source iteration
 if (frontDataSource)
 {
 NSLog(@&quot;Currently selected source is \&quot;%@\&quot; for port \&quot;%@\&quot;&quot;, builtInMicPort.selectedDataSource.dataSourceName, builtInMicPort.portName);
 NSLog(@&quot;Attempting to select source \&quot;%@\&quot; on port \&quot;%@\&quot;&quot;, frontDataSource, builtInMicPort.portName);
 // Set a preference for the front data source.
 theError = nil;
 result = [builtInMicPort setPreferredDataSource:frontDataSource error:&amp;theError];
 if (!result)
 {
 // an error occurred. Handle it!
 NSLog(@&quot;setPreferredDataSource failed&quot;);
 }
 }
 // Make sure the built-in mic is selected for input. This will be a no-op if the built-in mic is
 // already the current input Port.
 theError = nil;
 result = [myAudioSession setPreferredInput:builtInMicPort error:&amp;theError];
 if (!result)
 {
 // an error occurred. Handle it!
 NSLog(@&quot;setPreferredInput failed&quot;);
 }
}
</code></pre>
Listing 1 will produce the following console output when run on an iPhone 5:
<pre><code>There are 3 data sources for port :&quot;&lt;AVAudioSessionPortDescription: 0x14d935a0, type = MicrophoneBuiltIn; name = iPhone Microphone; UID = Built-In Microphone; selectedDataSource = Bottom&gt;&quot;
(
 &quot;&lt;AVAudioSessionDataSourceDescription: 0x14d93800, ID = 1835216945; name = Bottom&gt;&quot;,
 &quot;&lt;AVAudioSessionDataSourceDescription: 0x14d938d0, ID = 1835216946; name = Front&gt;&quot;,
 &quot;&lt;AVAudioSessionDataSourceDescription: 0x14d93a10, ID = 1835216947; name = Back&gt;&quot;
)
Currently selected source is &quot;Bottom&quot; for port &quot;iPhone Microphone&quot;
Attempting to select source &quot;&lt;AVAudioSessionDataSourceDescription: 0x14d938d0, ID = 1835216946; name = Front&gt;&quot; on port &quot;iPhone Microphone”
</code></pre>
<code>UPDATE 14 Nov</code>
Use the code in the front I can set the specific built-in mic on iPhone to record sound, now I’m trying to change the specific mic on iPhone frequently to simulate a stereo record.

For an app, we have a requirement to record from two different audio sources. One mic is a special (throat) mic and it comes with the same connector that the iPhone headset with mic uses.

On a second channel, we would like to record the ambient sounds and the best thing would be if we could just record from the iPhone's/iPad's built-in mic at the same time as we record from the throat mic headset.

Is there any way this is possible? Any other tips?

Two-channel recording on the iPhone/iPad: headset + built-in mic

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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社区新版编辑器体验调研

对于一个应用程序，我们有一个要求记录从两个不同的音频来源。一个麦克风是一种特殊的(喉)麦克风，它与带有麦克风的iPhone耳机具有相同的连接器。在第二个频道上，我们想要记录周围的声音，最好的办法是我们可以在用iPhone/iPad内置的麦克风录制声音的同时，用喉式麦克风进行录音。这有可能吗？还有其他建议吗？

问iPhone/iPad上的双通道录音:耳机+内置麦克风
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