AudioQueue 和 iOS4？
以下代码过去对我有用。我现在正在尝试使用 iOS4，但没有运气。它正在模拟器中工作，但我在设备本身上听不到任何声音。我首先尝试将一些样本记录到 NSMutableData 变量中，然后尝试回放它们。
我已经尝试过 Apple 的 SpeakHere 示例 - 它可以工作（但它从文件播放 - 而不是内存）。
知道我错过了什么吗？
AudioSessionInitialize(NULL, NULL, NULL, NULL);
UInt32 sessionCategory = kAudioSessionCategory_PlayAndRecord;
AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(sessionCategory), &sessionCategory);
AudioSessionSetActive(true);
AudioQueueNewOutput(&m_format,&OutputCallback,self,CFRunLoopGetCurrent(), kCFRunLoopCommonModes,0,&m_device);
AudioQueueBufferRef nBuffer=NULL;
AudioQueueAllocateBuffer(m_device,[data length],&nBuffer);
nBuffer->mAudioDataByteSize=[data length];
[data getBytes:(nBuffer->mAudioData) length:(nBuffer->mAudioDataByteSize)];
AudioQueueEnqueueBuffer(m_device,nBuffer,0,NULL);
AudioQueueStart(m_device,NULL);
The following code used to work for me in the past. I'm trying it now with iOS4 without luck. It is working in the simulator, but I don't hear anything on the device itself. I first try to record few samples into a NSMutableData variable, and then I try to play them back.
I've tried the SpeakHere sample from Apple - which works (but it playbacks from a file - not memory).
Any idea what am I missing?
AudioSessionInitialize(NULL, NULL, NULL, NULL);
UInt32 sessionCategory = kAudioSessionCategory_PlayAndRecord;
AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(sessionCategory), &sessionCategory);
AudioSessionSetActive(true);
AudioQueueNewOutput(&m_format,&OutputCallback,self,CFRunLoopGetCurrent(), kCFRunLoopCommonModes,0,&m_device);
AudioQueueBufferRef nBuffer=NULL;
AudioQueueAllocateBuffer(m_device,[data length],&nBuffer);
nBuffer->mAudioDataByteSize=[data length];
[data getBytes:(nBuffer->mAudioData) length:(nBuffer->mAudioDataByteSize)];
AudioQueueEnqueueBuffer(m_device,nBuffer,0,NULL);
AudioQueueStart(m_device,NULL);
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我可以建议的主要内容是：
（1）确保设备未静音并且音量已调高
（2）检查结果代码。例如：
其他可以为您提供更多信息的东西：
当它应该运行时，尝试调整音量。如果它调整铃声音量，则音频队列无法正确播放和/或设置。如果它调整播放音量，则 AudioQueue 在请求时可能无法获取数据。
作为记录，我有一个在所有设备上的 iOS 4 上使用 AudioQueue 的应用程序，所以我知道它可以工作并且不是一个错误。
坚持下去：AudioQueue 有时会非常非常烦人。
The main things I can suggest are:
(1) make sure the device is not muted and the volume is up
(2) Check the result codes. For instance:
Something else that would give you a little bit more information:
While it is supposed to be running, try adjusting the volume. If it adjusts the ringer volume, the AudioQueue is not playing and/or setup correctly. If it adjusts the playback volume, than the AudioQueue is probably not getting data when it asks for it.
For the record, I have a an application that's using the AudioQueue on iOS 4 on all devices, so I know it works and it's not a bug.
Keep at it: the AudioQueue can be very, very annoying at times.