c# - AVAudioRecorder 始终为空

Question

我一直在尝试以 xamarin 形式录制音频，但没有直接的方法，所以我试图通过自定义渲染来实现它，我遵循了 here 中的示例.

//AVAudioRecorder创建

        //set up the NSObject Array of values that will be combined with the keys to make the NSDictionary
        NSObject[] values = new NSObject[]
        {
            NSNumber.FromFloat (16000.0f), //Sample Rate
            NSNumber.FromInt32 ((int)AudioToolbox.AudioFormatType.MPEG4AAC), //AVFormat
            NSNumber.FromInt32 (1), //Channels
            NSNumber.FromInt32 (16), //PCMBitDepth  
            NSNumber.FromBoolean (false), //IsBigEndianKey
            NSNumber.FromBoolean (false) //IsFloatKey
        };

        //Set up the NSObject Array of keys that will be combined with the values to make the NSDictionary
        NSObject[] keys = new NSObject[]
        {
            AVAudioSettings.AVSampleRateKey,
            AVAudioSettings.AVFormatIDKey,
            AVAudioSettings.AVNumberOfChannelsKey,
            AVAudioSettings.AVLinearPCMBitDepthKey,
            AVAudioSettings.AVLinearPCMIsBigEndianKey,
            AVAudioSettings.AVLinearPCMIsFloatKey
        };

        //Set Settings with the Values and Keys to create the NSDictionary
        settings = NSDictionary.FromObjectsAndKeys (values, keys);

        //Set recorder parameters
        recorder = AVAudioRecorder.Create(url, new AudioSettings(settings), out error);

但是在代码中"recorder = AVAudioRecorder.Create(url, new AudioSettings(settings), out error);"总是空的

如有任何帮助，我们将不胜感激。

Answer 1

我自己修复了它，通过如下更改音频设置使其工作

    `var settings = new AudioSettings
        {
            SampleRate = 44100.0f,
            Format = AudioFormatType.LinearPCM,
            NumberChannels = 1,
            LinearPcmBitDepth = 16,
            AudioQuality = AVAudioQuality.High,
        };`