android AudioRecorder简单心得分享

2019-10-24 20:43:02

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这篇文章介绍了android AudioRecorder简单心得，有需要的朋友可以参考一下

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.");   
		}