[英]Recording voice in background using AVAudioRecorder
我正在嘗試使用AVAudioRecorder
在后台錄制用戶語音,但每次調用recordForDuration
方法時都會收到NO
。 我將“音頻”添加到UIBackgroundModes
但這沒有幫助。 順便說一句,Everything在前景中完美無缺。 我正在使用以下代碼初始化AVAudioRecorder
:
NSError* error;
if (![[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryRecord error:&error])
{
NSLog(@"Error while setting audio session category. Code - %d, description - \"%@\".", [error code], [error localizedDescription]);
return;
}
NSURL* outputFileURL = [VKMFileSystemHelper uniqueFileInPath:[[VKMFileSystemHelper subdirectoryInsideLibrary:DIR_AUDIO] path] withExtension:@"m4a"];
NSDictionary* recordSettings = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:kAudioFormatMPEG4AAC], AVFormatIDKey,
[NSNumber numberWithInt:AVAudioQualityMin] , AVEncoderAudioQualityKey,
[NSNumber numberWithInt:16] , AVEncoderBitRateKey,
[NSNumber numberWithInt:1] , AVNumberOfChannelsKey,
[NSNumber numberWithFloat:12000.0] , AVSampleRateKey,
nil];
_recorder = [[AVAudioRecorder alloc] initWithURL:outputFileURL settings:recordSettings error:&error];
[_recorder setDelegate:self];
if (error)
{
NSLog(@"Error occured during audio recorder initialization. Error code - %d, description - \"%@\".", [error code], [error localizedDescription]);
}
else
{
NSLog(@"Start recording.");
if ([_recorder recordForDuration:[shedule execLength]])
{
NSLog(@"Record started.");
}
else
{
NSLog(@"Record failed.");
}
}
如何從背景麥克風錄制? 這可能嗎?
嘗試這個,
***Appdelegate.m***
- (void)applicationDidEnterBackground:(UIApplication *)application
{
__block UIBackgroundTaskIdentifier task = 0;
task=[application beginBackgroundTaskWithExpirationHandler:^{
NSLog(@"Expiration handler called %f",[application backgroundTimeRemaining]);
[application endBackgroundTask:task];
task=UIBackgroundTaskInvalid;
}];
}
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