Android不显示Camera视频获取摄像头视频帧数据

1、在Activity界面代码中：

private var mCamera: Camera? = null

private val mWidth = GwApplication.DEFAULT_REMOTE_WIDTH_EXT

private val mHeight = GwApplication.DEFAULT_REMOTE_HEIGHT_EXT

private var imgData: ImageData = ImageData(mWidth, mHeight)

/**
 * Camera初始化
 **/
private fun initCameara() {
    //log("====initCameara()")
    try {
        mCamera = Camera.open(GwApplication.DEFAULT_CR_CAMERA)
        val params = mCamera!!.getParameters()
        params.previewFormat = ImageFormat.NV21
        params.setPreviewSize(mWidth, mHeight)
        //params.pictureFormat = ImageFormat.NV21
        params.setPictureSize(mWidth, mHeight)
        //params.zoom = 0
        //params.setRotation(0)
        params.setPreviewFpsRange(10, 15)
        mCamera!!.setParameters(params)
    } catch (ex: RuntimeException) {
        ex.printStackTrace()
    }
}

/**
 * 开始监听回调，设置预览
 **/
private fun setCallback() {
    //log("====setCallback()")
    try {
        // 主要是surfaceTexture获取预览数据，但不显示
        val surfaceTexture = SurfaceTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES)
        mCamera!!.setPreviewTexture(surfaceTexture)
    } catch (e: IOException) {
        e.printStackTrace()
    }
    // 设置 mCamera.addCallbackBuffer(mPreviewData) 后才会回调，旨在每处理完一帧数据回调一次
    mCamera!!.setPreviewCallbackWithBuffer(mPreviewCallback)
    mCamera!!.addCallbackBuffer(imgData.data)
    mCamera!!.startPreview()
}

/**
 * 帧数据监听实现
**/
private val mPreviewCallback =
    android.hardware.Camera.PreviewCallback { data, camera -> // 在此处处理当前帧数据，并设置下一帧回调
        //log("====PreviewCallback()")
        imgData.setTempData(data)
        mCamera!!.addCallbackBuffer(imgData.data)
        //        if (isShow) {
        //            showPic(imgData.previewData)
        //        }
    }

/**
 * 关闭相机
**/
private fun closeCamera() {
    mCamera!!.stopPreview()
    mCamera!!.setPreviewCallbackWithBuffer(null)
    mCamera!!.release()
    mCamera = null
}

/**
 * 显示图片
 **/
private fun showPic(data: ByteArray) {
    val time = System.currentTimeMillis()
    try {
        val image = YuvImage(data, ImageFormat.NV21, mWidth, mHeight, null)
        if (image != null) {
            val stream = ByteArrayOutputStream()
            image.compressToJpeg(Rect(0, 0, mWidth, mHeight), 80, stream)
            runOnUiThread {
                val curTime = System.currentTimeMillis()
                ivCamera.setImageBitmap(null)
                releaseBitmap()
                mBitmap = BitmapFactory.decodeByteArray(stream.toByteArray(), 0, stream.size())//fastYUVtoRGB!!.convertYUVtoRGB(data, mWidth, mHeight)
                stream.close()
                ivCamera.setImageBitmap(mBitmap)
                ivCamera.invalidate()
            }
        }
    } catch (e: Exception) {
    }
}

private fun releaseBitmap() {
    if(mBitmap != null) {
        if(!mBitmap!!.isRecycled) {
            mBitmap!!.recycle()
        }
        mBitmap = null
    }
}

2、屏幕和视频图像的效果图：

在这里插入图片描述

其他依赖代码：

ImageData.java文件

/**

author zoufeng
date:2021/10/15
desc:

*/

public class ImageData {

private int width;

private int height;

private int size;

private byte[] data;

private byte[] temp;

private Boolean isNew;

public ImageData(int width, int height) {

this.width = width;

this.height = height;

size = width * height * 3 / 2;

data = new byte[size];

temp = new byte[size];

isNew = true;

}

public int getWidth() {

return width;

}

public int getHeight() {

return height;

}

public byte[] getData() {

return data;

}

public void setTempData(byte[] preData) {

synchronized (isNew) {

if(!isNew) {

System.arraycopy(preData, 0, temp, 0, preData.length);

isNew = true;

}

}

}

public byte[] getTempData() {

return temp;

}

public boolean isNew() {

return isNew;

}

public void setNew(boolean isNew) {

synchronized (this.isNew) {

this.isNew = isNew;

}

}

}

FastYUVtoRGB.java文件：（用于YUV直接转换成Bitmap，速度比较快，图像转换在4毫秒一下。）

/**

author zoufeng
date:2021/11/17
desc:

*/

import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.Canvas;

import android.graphics.Matrix;

import android.renderscript.Allocation;

import android.renderscript.Element;

import android.renderscript.RenderScript;

import android.renderscript.ScriptIntrinsicYuvToRGB;

import android.renderscript.Type;

/**

使用RenderScript将视频YUV流转换为BMP
注：这个类适用于CameraPreview不变的情况

*/

public class FastYUVtoRGB {

private RenderScript rs;

private ScriptIntrinsicYuvToRGB yuvToRgbIntrinsic;

private Type.Builder yuvType, rgbaType;

private Allocation in, out;

public FastYUVtoRGB(Context context) {

rs = RenderScript.create(context);

yuvToRgbIntrinsic = ScriptIntrinsicYuvToRGB.create(rs, Element.U8_4(rs));

}

public Bitmap convertYUVtoRGB(byte[] yuvData, int width, int height) {

if (yuvType == null) {

yuvType = new Type.Builder(rs, Element.U8(rs)).setX(yuvData.length);

in = Allocation.createTyped(rs, yuvType.create(), Allocation.USAGE_SCRIPT);
```
     rgbaType = new Type.Builder(rs, Element.RGBA_8888(rs)).setX(width).setY(height);
     out = Allocation.createTyped(rs, rgbaType.create(), Allocation.USAGE_SCRIPT);
 }
 in.copyFrom(yuvData);
 yuvToRgbIntrinsic.setInput(in);
 yuvToRgbIntrinsic.forEach(out);
 Bitmap bmpout = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
 out.copyTo(bmpout);
 return bmpout;
```
}

/**
- Returns a transformation matrix from one reference frame into another.
- Handles cropping (if maintaining aspect ratio is desired) and rotation.
- @param srcWidth Width of source frame.
- @param srcHeight Height of source frame.
- @param dstWidth Width of destination frame.
- @param dstHeight Height of destination frame.
- @param applyRotation Amount of rotation to apply from one frame to another.
- ```
                       Must be a multiple of 90.
```
- @param flipHorizontal should flip horizontally
- @param flipVertical should flip vertically
- @param maintainAspectRatio If true, will ensure that scaling in x and y remains constant,
- ```
                       cropping the image if necessary.
```
- @return The transformation fulfilling the desired requirements.
  
  */
  
  public static Matrix getTransformationMatrix(
  
  final int srcWidth,
  
  final int srcHeight,
  
  final int dstWidth,
  
  final int dstHeight,
  
  final int applyRotation, boolean flipHorizontal, boolean flipVertical,
  
  final boolean maintainAspectRatio) {
  
  final Matrix matrix = new Matrix();
  
  if (applyRotation != 0) {
  
  if (applyRotation % 90 != 0) {
  
  throw new IllegalArgumentException(String.format(“Rotation of %d % 90 != 0”, applyRotation));
  
  }
```
 // Translate so center of image is at origin.
 matrix.postTranslate(-srcWidth / 2.0f, -srcHeight / 2.0f);

 // Rotate around origin.
 matrix.postRotate(applyRotation);
```
  }
  
  // Account for the already applied rotation, if any, and then determine how
  
  // much scaling is needed for each axis.
  
  final boolean transpose = (Math.abs(applyRotation) + 90) % 180 == 0;
  
  final int inWidth = transpose ? srcHeight : srcWidth;
  
  final int inHeight = transpose ? srcWidth : srcHeight;
  
  int flipHorizontalFactor = flipHorizontal ? -1 : 1;
  
  int flipVerticalFactor = flipVertical ? -1 : 1;
  
  // Apply scaling if necessary.
  
  if (inWidth != dstWidth || inHeight != dstHeight) {
  
  final float scaleFactorX = flipHorizontalFactor * dstWidth / (float) inWidth;
  
  final float scaleFactorY = flipVerticalFactor * dstHeight / (float) inHeight;
```
 if (maintainAspectRatio) {
     // Scale by minimum factor so that dst is filled completely while
     // maintaining the aspect ratio. Some image may fall off the edge.
     final float scaleFactor = Math.max(Math.abs(scaleFactorX), Math.abs(scaleFactorY));
     matrix.postScale(scaleFactor, scaleFactor);
 } else {
     // Scale exactly to fill dst from src.
     matrix.postScale(scaleFactorX, scaleFactorY);
 }
```
  }
  
  if (applyRotation != 0) {
  
  // Translate back from origin centered reference to destination frame.
  
  float dx = dstWidth / 2.0f;
  
  float dy = dstHeight / 2.0f;
  
  matrix.postTranslate(dx, dy);
  
  // postScale中心点如果出错，图像不会被变换
  
  matrix.postScale(flipHorizontalFactor, flipVerticalFactor, dx, dy);
  
  }
  
  return matrix;
  
  }
/*

/*

example

final Canvas canvas = new Canvas(out);

// 这里的空白bitmap尺寸需要与变换后的预期尺寸一致

Bitmap src = Bitmap.createBitmap(height, width, Bitmap.Config.ARGB_8888);

Matrix transformation = getTransformationMatrix(src.getWidth(), src.getHeight(), targetWidth, targetHeight, rotation,true,false, true);

canvas.drawBitmap(src, transformation, null);

*/

}

原文链接：https://blog.csdn.net/bluefire1126/article/details/121619122

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