JavaCV 采集摄麦克风音频数据

上一次介绍 JavaCV采集摄像头及桌面视频数据，同样的，采集音频数据也可以使用JavaCV。

引入依赖

引入JavaCV 1.5.5 maven依赖：

<properties><javacpp.version>1.5.5</javacpp.version></properties><dependencies><dependency><groupId>org.bytedeco</groupId><artifactId>javacv</artifactId><version>${javacpp.version}</version></dependency><dependency><groupId>org.bytedeco</groupId><artifactId>javacv-platform</artifactId><version>${javacpp.version}</version></dependency></dependencies>

采用FFmpeg采集麦克风数据

跟采集视频一样，麦克风音频数据也可以使用ffmpeg采集，同样使用dshow，这里有点不同的是采集的数据使用AAC编码后存储。

如果想采集PCM数据，可以查看我的另外一篇文章 JavaCV FFmpeg采集麦克风PCM音频数据

public class Sample02 {public static void main(String[] args) throws Exception {FFmpegFrameGrabber grabber = new FFmpegFrameGrabber("audio=麦克风阵列 (Realtek(R) Audio)");grabber.setFormat("dshow");FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(new File("Test01.aac"), 2);recorder.setAudioOption("crf", "0");recorder.setAudioQuality(0);recorder.setAudioBitrate(192000);recorder.setSampleRate(44100);recorder.setAudioChannels(2);// AACrecorder.setAudioCodec(avcodec.AV_CODEC_ID_AAC);grabber.start();recorder.start();Frame frame = null;int count = 0;while ((frame = grabber.grab()) != null) {recorder.record(frame);if (count++ > 100) {break;}}grabber.close();recorder.close();}}

直接读取麦克风音频数据

除了使用FFmpeg采集麦克风音频数据外，还是采用直接读取麦克风音频字节数据的方式，采集音频数据，同样进行AAC编码。

public class Sample01 {public static void main(String[] args) throws Exception {FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(new File("Test01.aac"), 2);recorder.setAudioOption("crf", "0");recorder.setAudioQuality(0);recorder.setAudioBitrate(192000);recorder.setSampleRate(44100);recorder.setAudioChannels(2);// AACrecorder.setAudioCodec(avcodec.AV_CODEC_ID_AAC);recorder.start();AudioFormat format = new AudioFormat(44100.0F, 16, 2, true, false);TargetDataLine line = (TargetDataLine) AudioSystem.getLine(new DataLine.Info(TargetDataLine.class, format));line.open(format);line.start();int sampleRate = (int) format.getSampleRate();int numChannels = format.getChannels();byte[] buffer = new byte[sampleRate * numChannels];int count = 0;while (count++ < 100) {int nBytesRead = 0;while (nBytesRead == 0) {nBytesRead = line.read(buffer, 0, line.available());}int nSamplesRead = nBytesRead / 2;short[] samples = new short[nSamplesRead];ByteBuffer.wrap(buffer).order(ByteOrder.LITTLE_ENDIAN).asShortBuffer().get(samples);ShortBuffer sBuff = ShortBuffer.wrap(samples, 0, nSamplesRead);recorder.recordSamples(sampleRate, numChannels, sBuff);}recorder.close();}}