Question

我一直在尝试以xamarin形式录制音频，没有直接的方法可以做到这一点所以我试图通过自定义渲染来实现它，我已经跟随了here的示例。

//创建AVAudioRecorder

        //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＆＃34; recorder = AVAudioRecorder.Create（url，new AudioSettings（settings），out error）;＆＃34; 始终为null

非常感谢任何帮助。

Answer 1

我自己修复了它，通过更改音频设置使其工作如下

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

AVAudioRecorder始终为空

1 个答案: