previewCallback不打在回调previewFrame

previewCallback不打在回调previewFrame

本文介绍了setOneShot previewCallback不打在回调previewFrame()的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我创建了一个应用程序我正在做一个视频采集活动,我想捕捉preVIEW框架,以及一个播放按钮来使用。我给自己定了 SurfaceView 的onCreate(...)并迷上了相机的preVIEW显示在 SurfaceHolder.Callback

I'm creating a video capture activity for an app I'm making, and I want to capture a preview frame as well to use as a playback button. I've set the SurfaceView up in onCreate(...) and hooked up the camera's preview display in the SurfaceHolder.Callback:

private Callback mSurfaceViewCallback = new Callback() {

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        mSurfaceCreated = false;
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        try {
            mSurfaceCreated = true;
            mCamera.setPreviewDisplay(mHolder);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width,
            int height) {
        try {
            mSurfaceCreated = true;
            mCamera.setPreviewDisplay(mHolder);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
};

这对于静态相机应用工作的罚款。相机preVIEW开启和关闭的onPause() onResume()

@Override
protected void onResume() {
    super.onResume();
    if(mCamera!=null)
        mCamera.startPreview();
}

@Override
protected void onPause() {
    if(mCamera!=null)
        mCamera.stopPreview();
    super.onPause();
}

和我已经设置了 MediaRecorder 像这样的:

and I've set the MediaRecorder up like this:

protected void startRecording() {
    mMediaRecorder = new MediaRecorder();
    mCamera.unlock();
    mMediaRecorder.setCamera(mCamera);
    mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
    mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
    mMediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_LOW));

    mMediaRecorder.setMaxDuration(10000);
    mMediaRecorder.setOutputFile(new File(getFilesDir(), mChallengeUUID + ".mp4").getAbsolutePath());
    mMediaRecorder.setPreviewDisplay(mHolder.getSurface());
    try {
        mMediaRecorder.prepare();
    } catch (IllegalStateException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    mCamera.setOneShotPreviewCallback(mPreviewCallback);
    mMediaRecorder.start();
}

这是倒数第二行,但是,不工作。我的相机。previewCallback 在previewFrame(...)方法被错过。

That penultimate line, however, isn't working. My Camera.PreviewCallback's onPreviewFrame(...) method is being missed.

有它的目的是,正如我所说,以获得当正在录像,显示给用户的起始帧。为什么没有回调被打?

The purpose of having it is, as I say, to get a frame from the beginning of when the video is being recorded to display to the user. Why isn't the callback being hit?

推荐答案

mCamera.unlock()从分离过程中的相机。因此有必要呼吁:

mCamera.unlock() detaches the camera from the process. It's necessary to call:

mCamera.reconnect();

在调用之前:

before calling:

mCamera.setOneShotPreviewCallback(mPreviewCallback);

(但一切后)。

(but after everything else).

这篇关于setOneShot previewCallback不打在回调previewFrame()的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

07-30 16:52