android AudioRecorder简单心得分享

2020-04-11 12:02:32

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1.如何创建一个有效的AudioRecorder实例
Android各种设备的采样频率不同，输入的声道数也不同，如果采用固定的采样频率和声道数，那么得到的AudioRecorder不一定能够正常初始化。
为了正常使用，需要尝试各种不同的参数，得到在此设备上可以用的AudioRecorder实例。代码如下：

复制代码代码如下:

private void createAudioRecord() {   
           for (int sampleRate : new int[]{44100, 8000, 11025, 16000, 22050, 32000,   
            47250, 48000}) {   
        for (short audioFormat : new short[]{   
                AudioFormat.ENCODING_PCM_16BIT,   
                AudioFormat.ENCODING_PCM_8BIT}) {   
            for (short channelConfig : new short[]{   
                    AudioFormat.CHANNEL_IN_MONO,   
                    AudioFormat.CHANNEL_IN_STEREO}) {   

                // Try to initialize   
                try {   
                    recBufSize = AudioRecord.getMinBufferSize(sampleRate,   
                            channelConfig, audioFormat);   

                    if (recBufSize < 0) {   
                        continue;   
                    }   

                    audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC,   
                            sampleRate, channelConfig, audioFormat,   
                            recBufSize * 2);   

                    if (audioRecord.getState() == AudioRecord.STATE_INITIALIZED) {   

                        return;   
                    }   

                    audioRecord.release();   
                    audioRecord = null;   
                } catch (Exception e) {   
                    // Do nothing   
                }   
            }   
        }   
    }   

    throw new IllegalStateException(   
            "getInstance() failed : no suitable audio configurations on this device.");   
}