Android Open Source - Android_MediaCodecTest Video Param

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2013 MorihiroSoft/* w w  w  .j av  a2  s.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 jp.morihirosoft.mediacodectest16;

import android.graphics.ImageFormat;
import android.hardware.Camera;
import android.hardware.Camera.Size;
import android.os.Environment;
import android.util.Log;

public class VideoParam {
  private static final String TAG = "VideoParam";

  //---------------------------------------------------------------------
  // CONSTANTS
  //---------------------------------------------------------------------
  private static final int    VIDEO_W = 640;
  private static final int    VIDEO_H = 480;
  private static final int    FPS     = 30;
  private static final String MIME    = "video/avc";
  private static final int    BPS     = 4194304; // 0x400000
  private static final int    IFI     = 5;
  private static final String SDCARD  = Environment.getExternalStorageDirectory().getPath();
  private static final String OUTPUT  = SDCARD + "/video.mp4";

  //---------------------------------------------------------------------
  // MEMBERS
  //---------------------------------------------------------------------
  public final int     mCameraId;
  public final boolean mFacingFront;
  public final Size    mSize;
  public final int[]   mFpsRange;
  public final String  mMime   = MIME;
  public final int     mBps    = BPS;
  public final int     mIfi    = IFI;
  public final String  mOutput = OUTPUT;

  //---------------------------------------------------------------------
  // SINGLETON
  //---------------------------------------------------------------------
  private static volatile VideoParam sInstance = null;
  private static final    Object     sSyncObj  = new Object();

  public static VideoParam getInstance() {
    if (sInstance == null) {
      synchronized (sSyncObj) {
        if (sInstance == null) {
          sInstance = new VideoParam();
        }
      }
    }
    return sInstance;
  }

  private VideoParam() {
    int num = Camera.getNumberOfCameras();
    if (num < 1) {
      throw new UnsupportedOperationException("No camera");
    }

    // Id
    mCameraId = 0;

    Camera.Parameters cp = null;
    try {
      Camera c = Camera.open(mCameraId);
      cp = c.getParameters();
      c.release();
    } catch (Exception e) {
      throw new RuntimeException();
    }

    final Camera.CameraInfo ci = new Camera.CameraInfo();
    Camera.getCameraInfo(mCameraId, ci);

    // Facing
    mFacingFront = (ci.facing == Camera.CameraInfo.CAMERA_FACING_FRONT);

    // Size
    Size size = null;
    for (Camera.Size s : cp.getSupportedPreviewSizes()) {
      if (s.width == VIDEO_W && s.height == VIDEO_H) {
        size = s;
      }
    }
    if (size == null) {
      throw new UnsupportedOperationException(
          String.format("Not support size: %dx%d",VIDEO_W,VIDEO_H));
    }
    mSize = size;

    // Frame rate
    int[] fps = null;
    for (int[] s : cp.getSupportedPreviewFpsRange()) {
      if (s[Camera.Parameters.PREVIEW_FPS_MAX_INDEX] >= FPS*1000) {
        fps = s;
      }
    }
    if (fps == null) {
      throw new UnsupportedOperationException(
          String.format("Not support fps: %d",FPS));
    }
    mFpsRange = fps;

    // Format (check only)
    final int img_fmt = cp.getPreviewFormat();
    switch (img_fmt) {
    case ImageFormat.NV21:
      break;
    case ImageFormat.YUY2:
      throw new UnsupportedOperationException(
          "Not supported: ImageFormat=YUY2");
    case ImageFormat.YV12:
      throw new UnsupportedOperationException(
          "Not supported: ImageFormat=YV12");
    default:
      throw new UnsupportedOperationException(
          "Not supported: ImageFormat=???("+img_fmt+")");
    }

    //
    Log.i(TAG, "CameraId = "+mCameraId);
    Log.i(TAG, "FacingFront = "+mFacingFront);
    Log.i(TAG, "Size = "+mSize.width+"x"+mSize.height);
    Log.i(TAG, "FpsRange = {"+
        mFpsRange[Camera.Parameters.PREVIEW_FPS_MIN_INDEX]+","+
        mFpsRange[Camera.Parameters.PREVIEW_FPS_MAX_INDEX]+"}");
    Log.i(TAG, "ImageFormat = NV21");
  }

  //---------------------------------------------------------------------
  // PUBLIC METHODS
  //---------------------------------------------------------------------
  public int getMaxFps() {
    return mFpsRange[Camera.Parameters.PREVIEW_FPS_MAX_INDEX] / 1000;
  }
}

Java Source Code List

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