Android Open Source - LandscapeVideoCamera Capture Preview

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Back to project page LandscapeVideoCamera.

License

The source code is released under:

Apache License

Java Source Code

/**
 * Copyright 2014 Jeroen Mols/*from www  .ja v  a  2s  .  c om*/
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.jmolsmobile.landscapevideocapture.preview;

import android.view.SurfaceHolder;

import com.jmolsmobile.landscapevideocapture.CLog;
import com.jmolsmobile.landscapevideocapture.camera.CameraWrapper;

import java.io.IOException;

public class CapturePreview implements SurfaceHolder.Callback {

  private boolean              mPreviewRunning  = false;
  private final CapturePreviewInterface  mInterface;
  public final CameraWrapper        mCameraWrapper;

  public CapturePreview(CapturePreviewInterface capturePreviewInterface, CameraWrapper cameraWrapper,
      SurfaceHolder holder) {
    mInterface = capturePreviewInterface;
    mCameraWrapper = cameraWrapper;

    initalizeSurfaceHolder(holder);
  }

  @SuppressWarnings("deprecation")
  private void initalizeSurfaceHolder(final SurfaceHolder surfaceHolder) {
    surfaceHolder.addCallback(this);
    surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); // Necessary for older API's
  }

  @Override
  public void surfaceCreated(final SurfaceHolder holder) {
    // NOP
  }

  @Override
  public void surfaceChanged(final SurfaceHolder holder, final int format, final int width, final int height) {
    if (mPreviewRunning) {
      try {
        mCameraWrapper.stopPreview();
      } catch (final Exception e) {
        e.printStackTrace();
      }
    }

    try {
      mCameraWrapper.configureForPreview(width, height);
      CLog.d(CLog.PREVIEW, "Configured camera for preview in surface of " + width + " by " + height);
    } catch (final RuntimeException e) {
      e.printStackTrace();
      CLog.d(CLog.PREVIEW, "Failed to show preview - invalid parameters set to camera preview");
      mInterface.onCapturePreviewFailed();
      return;
    }

    try {
      mCameraWrapper.enableAutoFocus();
    } catch (final RuntimeException e) {
      e.printStackTrace();
      CLog.d(CLog.PREVIEW, "AutoFocus not available for preview");
    }

    try {
      mCameraWrapper.startPreview(holder);
      setPreviewRunning(true);
    } catch (final IOException e) {
      e.printStackTrace();
      CLog.d(CLog.PREVIEW, "Failed to show preview - unable to connect camera to preview (IOException)");
      mInterface.onCapturePreviewFailed();
    } catch (final RuntimeException e) {
      e.printStackTrace();
      CLog.d(CLog.PREVIEW, "Failed to show preview - unable to start camera preview (RuntimeException)");
      mInterface.onCapturePreviewFailed();
    }
  }

  @Override
  public void surfaceDestroyed(final SurfaceHolder holder) {
    // NOP
  }

  public void releasePreviewResources() {
    if (mPreviewRunning) {
      try {
        mCameraWrapper.stopPreview();
        setPreviewRunning(false);
      } catch (final Exception e) {
        e.printStackTrace();
        CLog.e(CLog.PREVIEW, "Failed to clean up preview resources");
      }
    }
  }

  protected void setPreviewRunning(boolean running) {
    mPreviewRunning = running;
  }

}

Java Source Code List

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