Android 使用librtmp推流【音频采集模块】

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1.音频采集模块的接口initAudioDevice在RtmpPublisher初始化init()时被调用。

initAudioDevice中会创建AudioRecord对象

mAudioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, sampleRate, channelConfig,audioFormat, buffsize);

2.音频采集模块的接口start在RtmpPublisher中调用startGather()时被调用。

start函数中开启一个音频采集线程

音频采集线程每次都调用mAudioRecord.read(buffer,0, buffer.length)读取音频数据。

读取到音频数据后调用mCallback.audioData(audio)将采集到的音频数据转发给音频编码模块。

具体的音频采集代码如下：

public class AudioGatherer {    private static final String TAG = "AudioGatherer";    private Config mConfig;    private AudioRecord mAudioRecord;    private byte[] buffer;    private Thread workThread;    private boolean loop;    private Callback mCallback;    public static AudioGatherer newInstance(Config config) {        return new AudioGatherer(config);    }    private AudioGatherer(Config config){        this.mConfig =config;    }    public static class Params {        public final int sampleRate;        public final int channelCount;        public Params(int sampleRate, int channelCount) {            this.sampleRate = sampleRate;            this.channelCount = channelCount;        }    }    /**     * 初始化录音     */    public Params initAudioDevice() {        int[] sampleRates = {44100, 22050, 16000, 11025};        for (int sampleRate :                sampleRates) {            //编码制式            int audioFormat = mConfig.audioFormat;            // stereo 立体声，            int channelConfig = mConfig.channelConfig;            int buffsize = 2 * AudioRecord.getMinBufferSize(sampleRate, channelConfig, audioFormat);            mAudioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, sampleRate, channelConfig,                    audioFormat, buffsize);            if (mAudioRecord.getState() != AudioRecord.STATE_INITIALIZED) {                continue;            }            this.buffer = new byte[Math.min(4096, buffsize)];            return new Params(sampleRate,                    channelConfig == AudioFormat.CHANNEL_CONFIGURATION_STEREO ? 2 : 1);        }        return null;    }    /**     * 开始录音     */    public void start() {        workThread = new Thread() {            @Override            public void run() {                mAudioRecord.startRecording();                while (loop && !Thread.interrupted()) {                    int size = mAudioRecord.read(buffer, 0, buffer.length);                    if (size < 0) {                        Log.i(TAG, "audio ignore ,no data to read");                        break;                    }                    if (loop) {                        byte[] audio = new byte[size];                        System.arraycopy(buffer, 0, audio, 0, size);                        if (mCallback != null) {                            mCallback.audioData(audio);                        }                    }                }            }        };        loop = true;        workThread.start();    }    public void stop() {        loop = false;        workThread.interrupt();        Log.i(TAG, "run: 调用stop");        mAudioRecord.stop();    }    public void release() {        mAudioRecord.release();    }    public void setCallback(Callback callback) {        this.mCallback = callback;    }    public interface Callback {        void audioData(byte[] data);    }}

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