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DingRTC為您提供了輸入外部音視頻流的功能。通過閱讀本文，您可以了解輸入外部音視頻流的方法。

輸入外部視頻流

說明

SDK允許先推流然后開啟外部視頻輸入，但這種情況下，默認開始推流時，先推送出的是本地原始采集源（攝像頭或屏幕捕獲）的視頻數據，直到啟用外部輸入。

調用 setExternalVideoSource注冊外部視頻接口回調。

//獲取DingRtcEngine實例
DingRtcEngine mRtcEngine = DingRtcEngine.create(getApplicationContext(),"");
mRtcEngine.setExternalVideoSource(
    boolean enable,
    boolean useTexture,
    DingRtcEngine.DingRtcVideoTrack.DingRtcVideoTrackCamera,
    DingRtcEngine.DingRtcRenderMode.DingRtcRenderModeAuto);

輸入視頻數據。

接口說明如下所示。

public abstract int pushExternalVideoFrame(DingRtcRawDataFrame rawDataFrame,DingRtcVideoTrack streameType);

參數說明，AliRawDataFrame 必填項如下所示。

參數	類型	描述
rawDataFrame	DingRtcRawDataFrame	幀數據。
streameType	DingRtcVideoTrack	視頻流類型。

示例方法如下所示。

private void pushVideoFrame() {
    String yuvPath = "<!-請輸入yuv文件地址->";
    if (TextUtils.isEmpty(yuvPath)) {
        // 請先選擇YUV文件！！！
        return;
    }
    File yuvDataFile = new File(yuvPath);
    if (!yuvDataFile.exists()) {
        //  文件不存在！！！
        return;
    }

    //此處僅為示例代碼做法，請使用正確的流角度
    int rotation = 90;
    //此處僅為示例代碼做法，請使用正確的流寬高
    int width = 480;
    int height = 640;
    int fps = 25;
    //start push yuv
    new Thread() {
        @Override
        public void run() {
            File yuvDataFile = new File(yuvPath);
            RandomAccessFile raf = null;
            try {
                raf = new RandomAccessFile(yuvDataFile, "r");
            } catch (FileNotFoundException e) {
                e.printStackTrace();
                return;
            }
            try {
                byte[] buffer = new byte[width * height * 3 / 2];
                while (!mIsStopPushVideo) { // mIsStopPushVideo 控制開始或者停止視頻推流
                    long start = System.currentTimeMillis();
                    int len = raf.read(buffer);
                    if (len == -1) {
                        raf.seek(0);
                    }
                    DingRtcEngine.DingRtcRawDataFrame rawDataFrame = new DingRtcEngine.DingRtcRawDataFrame();
                    rawDataFrame.format = DingRtcEngine.DingRtcVideoFormat.DingRtcVideoFormatI420;// 支持I420
                    rawDataFrame.frame = buffer;
                    rawDataFrame.width = width;
                    rawDataFrame.height = height;
                    rawDataFrame.lineSize[0] = width;
                    rawDataFrame.lineSize[1] = width / 2;
                    rawDataFrame.lineSize[2] = height / 2;
                    rawDataFrame.lineSize[3] = 0;
                    rawDataFrame.rotation = rotation;
                    rawDataFrame.videoFrameLength = buffer.length;
                    rawDataFrame.timestamp = System.nanoTime() / 1000;
                    if (mRtcEngine != null) {
                        mRtcEngine.pushExternalVideoFrame(rawDataFrame, DingRtcEngine.DingRtcVideoTrack.DingRtcVideoTrackCamera);
                    }
                    //通過sleep的時間來控制發送的幀率
                    long use = System.currentTimeMillis() - start;
                    long delay = 1000/fps - use;
                    if(delay < 0) {
                    	delay = 0;
                    }
                    Thread.sleep(delay);
                }
            } catch (IOException | InterruptedException ex) {
                ex.printStackTrace();
            } finally {
                try {
                    raf.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }.start();
}

調用setExternalVideoSource取消注冊外部視頻接口回調。

//獲取DingRtcEngine實例
DingRtcEngine mRtcEngine = DingRtcEngine.create(getApplicationContext(),"");
mRtcEngine.setExternalVideoSource(
    boolean enable,
    boolean useTexture,
    DingRtcEngine.DingRtcVideoTrack.DingRtcVideoTrackCamera,
    DingRtcEngine.DingRtcRenderMode.DingRtcRenderModeAuto);

參數	類型	描述
enable	boolean	啟用外部視頻輸入源，取值：true：啟用。false（默認值）：關閉。
useTexture	boolean	是否使用texture模式，取值：true：使用。false（默認值）：不使用。
type	AliRtcVideoTrack	視頻流類型。
renderMode	AliRtcRenderMode	渲染模式。

輸入外部音頻流

調用 setExternalAudioSource啟用外部音頻輸入。

//獲取DingRtcEngine實例
DingRtcEngine mRtcEngine = DingRtcEngine.create(getApplicationContext(),"");
//設置開啟外部音頻輸入源
mRtcEngine.setExternalAudioSource(true, 44100, 1);

調用pushExternalAudioFrame輸入音頻數據。

private void decodePCMRawData(){
    String pcmPath = "/sdcard/123.pcm";
    if (TextUtils.isEmpty(pcmPath)) {
        ToastUtils.LongToast("請先選擇PCM文件！！！");
        return;
    }
    File pcmDataFile = new File(pcmPath);
    if (!pcmDataFile.exists()) {
        ToastUtils.LongToast(pcmPath + " 文件不存在！！！");
        return;
    }
    ToastUtils.LongToast("inputing pcm data");

    new Thread() {
        @Override
        public void run() {
            File pcmDataFile = new File(pcmPath);
            RandomAccessFile raf = null;
            try {
                raf = new RandomAccessFile(pcmDataFile, "r");
            } catch (FileNotFoundException e) {
                e.printStackTrace();
                return;
            }
            try {
                int sampleRate = 44100;
                int length_ms = 10;
                int numChannels = 1;
                int bytePerSample = 2 * numChannels;
                ByteBuffer byteBuffer = ByteBuffer.allocateDirect(sampleRate * length_ms * numChannels * bytePerSample / 1000);
                final int sizeInBytes = byteBuffer.capacity();
                while (true) {
                    long start = System.currentTimeMillis();
                    int len = raf.read(byteBuffer.array());
                    if (len == -1) {
                        raf.seek(0);
                    }
                    DingRtcEngine.DingRtcAudioFrame audioFrame = new DingRtcEngine.DingRtcAudioFrame();
                    audioFrame.data = byteBuffer;
                    audioFrame.numSamples = sampleRate * length_ms /1000;
                    audioFrame.bytesPerSample = bytePerSample;
                    audioFrame.numChannels = numChannels;
                    audioFrame.samplesPerSec = sampleRate;
                    mRtcEngine.pushExternalAudioFrame(audioFrame);
                    byteBuffer.rewind();
                    long end = System.currentTimeMillis();
                    long sleep = 10 - (end - start);
                    if(sleep > 0) {
                        SystemClock.sleep(sleep);
                    }
                }
            } catch (IOException | InterruptedException ex) {
                ex.printStackTrace();
            } finally {
                try {
                    raf.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }.start();
}

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Android

輸入外部視頻流

輸入外部音頻流