音频会话中断结束后，AVAudioRecorder无法在后台录制 [英] AVAudioRecorder not recording in background after audio session interruption ended

问题描述

我正在我的应用中录制音频，包括前景和后台。我还处理AVAudioSessionInterruptionNotification以在中断开始时停止录制并在结束时再次开始。虽然在前台它按预期工作，当应用程序在后台录制并且我接到一个呼叫时，它不会在呼叫结束后再次开始录制。我的代码如下：

I am recording audio in my app, both in foreground and in background. I also handle AVAudioSessionInterruptionNotification to stop recording when interruption begins and start again when it ends. Although in foreground it works as expected, when app is recording in background and I receive a call it doesn't start again recording after call ends. My code is the following:

        - (void)p_handleAudioSessionInterruptionNotification:(NSNotification *)notification
        {
            NSUInteger interruptionType = [[[notification userInfo] objectForKey:AVAudioSessionInterruptionTypeKey] unsignedIntegerValue];

            if (interruptionType == AVAudioSessionInterruptionTypeBegan) {
                if (self.isRecording && !self.interruptedWhileRecording) {

                    [self.recorder stop];

                    self.interruptedWhileRecording = YES;
                    return;
                }
            }

            if (interruptionType == AVAudioSessionInterruptionTypeEnded) {
                if (self.interruptedWhileRecording) {
                    NSError *error = nil;
                    [[AVAudioSession sharedInstance] setActive:YES error:&error];

                    NSDictionary *settings = @{
                                       AVEncoderAudioQualityKey: @(AVAudioQualityMax),
                                       AVSampleRateKey: @8000,
                                       AVFormatIDKey: @(kAudioFormatLinearPCM),
                                       AVNumberOfChannelsKey: @1,
                                       AVLinearPCMBitDepthKey: @16,
                                       AVLinearPCMIsBigEndianKey: @NO,
                                       AVLinearPCMIsFloatKey: @NO
                                       };

                    _recorder = [[AVAudioRecorder alloc] initWithURL:fileURL settings:settings error:nil];

                    [self.recorder record];

                    self.interruptedWhileRecording = NO;
                    return;
                }
            }
        }

请注意，fileURL指向新的NSDocumentDirectory子目录中的caf文件。配置背景模式音频。我也试过voip和播放沉默，都没有成功。

Note that fileURL points to new caf file in a NSDocumentDirectory subdirectory. Background mode audio is configured. I also tried voip and play silence, both to no success.

AVAudioSessionInterruptionTypeEnded块中的NSError是OSStatus错误560557684，我还没有找到解决方法。

The NSError in AVAudioSessionInterruptionTypeEnded block is a OSStatus error 560557684 which I haven't found how to tackle.

非常感谢任何帮助。

推荐答案

我添加了以下

[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];

并且它有效。仍然不知道可能会出现什么错误。

before configuring AVAudioSession and it worked. Still don't know what bugs may appear.

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