我正在尝试根据自己的活动创建4个摄像机预览流。我创建了一个TextureView，将其注册到feed的camera2 API，然后在SurfaceView上设置了一个侦听器，以侦听feed的更改并相应地更新其他3个预览（ImageViews）。您可以在下面的代码中看到：
private final TextureView.SurfaceTextureListener mSurfaceTextureListener
= new TextureView.SurfaceTextureListener() {
@Override
public void onSurfaceTextureAvailable(SurfaceTexture texture, int width, int height) {
cameraHandler.openCamera(width, height);
}
@Override
public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {
}
@Override
public boolean onSurfaceTextureDestroyed(SurfaceTexture texture) {
return true;
}
@Override
public void onSurfaceTextureUpdated(SurfaceTexture texture) {
for (ImageView mSecondaryPreview : mSecondaryPreviews) {
Bitmap frame = Bitmap.createBitmap(mTextureView.getWidth(), mTextureView.getHeight(), Bitmap.Config.ARGB_8888);
mTextureView.getBitmap(frame);
mSecondaryPreview.setImageBitmap(frame);
}
}
};
如您所见，必须从TextureView中读取每一帧，提取位图，然后设置其他3个ImageView流的位图。我最初尝试在非常慢的UI线程上执行此操作，然后尝试将其提交给具有更好帧速率的后台处理程序，但由于负载导致应用崩溃的问题很多。
谢谢
编辑
因此，为了裁剪预览的底部0.4375，我将ttmp更改为
float[] ttmp = {
0.0f, 1.0f,
1.0f, 1.0f,
0.0f, 0.4375f,
0.0f, 0.4375f,
1.0f, 1.0f,
1.0f, 0.4375f,
0.0f, 1.0f,
1.0f, 1.0f,
0.0f, 0.4375f,
0.0f, 0.4375f,
1.0f, 1.0f,
1.0f, 0.4375f,
0.0f, 1.0f,
1.0f, 1.0f,
0.0f, 0.4375f,
0.0f, 0.4375f,
1.0f, 1.0f,
1.0f, 0.4375f,
0.0f, 1.0f,
1.0f, 1.0f,
0.0f, 0.4375f,
0.0f, 0.4375f,
1.0f, 1.0f,
1.0f, 0.4375f
};
但这没有达到预期的效果
因此，如果您可以GLSurfaceView像本问题一样使用相机预览，则只需再添加6个多边形，就可以再制作3个副本。让我解释一下它们的布局。vtmp并ttmp分别以以下GL_TRIANGLE_STRIP形式描述两个三角形的矢量坐标和纹理坐标：
float[] vtmp = {
1.0f, 1.0f, //Top right of screen
1.0f, -1.0f, //Bottom right of screen
-1.0f, 1.0f, //Top left of screen
-1.0f, -1.0f //Bottom left of screen
};
float[] ttmp = {
1.0f, 1.0f, //Top right of camera surface
0.0f, 1.0f, //Top left of camera surface
1.0f, 0.0f, //Bottom right of camera surface
0.0f, 0.0f //Bottom left of camera surface
};
步骤1：让我们将基本类型更改为GL_TRIANGLES，因为使用a会很困难GL_TRIANGLE_STRIP：
//This also includes a fix for the left/right inversion:
float[] vtmp = {
//Triangle 1:
-1.0f, -1.0f,
-1.0f, 1.0f,
1.0f, 1.0f,
//Triangle 2:
1.0f, -1.0f,
-1.0f, 1.0f,
1.0f, 1.0f
};
float[] ttmp = {
//Triangle 1:
0.0f, 1.0f,
1.0f, 1.0f,
0.0f, 0.0f,
//Triangle 2:
0.0f, 0.0f,
1.0f, 1.0f,
1.0f, 0.0f
};
pVertex = ByteBuffer.allocateDirect(12*4).order(ByteOrder.nativeOrder()).asFloatBuffer();
(...)
pTexCoord = ByteBuffer.allocateDirect(12*4).order(ByteOrder.nativeOrder()).asFloatBuffer();
(...)
GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, 6); //Careful: Multiple changes on this line
(...)
如果第1步顺利进行，那么让我们在第2步中添加额外的三角形：
float[] vtmp = {
//Triangle 1:
-1.0f, 0.0f,
-1.0f, 1.0f,
0.0f, 0.0f,
//Triangle 2:
0.0f, 0.0f,
-1.0f, 1.0f,
0.0f, 1.0f,
//Triangle 3:
0.0f, 0.0f,
0.0f, 1.0f,
1.0f, 0.0f,
//Triangle 4:
1.0f, 0.0f,
0.0f, 1.0f,
1.0f, 1.0f,
//Triangle 5:
0.0f, -1.0f,
0.0f, 0.0f,
1.0f, -1.0f,
//Triangle 6:
1.0f, -1.0f,
0.0f, 0.0f,
1.0f, 0.0f,
//Triangle 7:
-1.0f, -1.0f,
-1.0f, 0.0f,
0.0f, -1.0f,
//Triangle 8:
0.0f, -1.0f,
-1.0f, 0.0f,
0.0f, 0.0f
};
float[] ttmp = {
//This is the same as in Step 1, but duplicated 4 times over:
//Triangle 1:
0.0f, 1.0f,
1.0f, 1.0f,
0.0f, 0.0f,
//Triangle 2:
0.0f, 0.0f,
1.0f, 1.0f,
1.0f, 0.0f,
//Triangle 3:
0.0f, 1.0f,
1.0f, 1.0f,
0.0f, 0.0f,
//Triangle 4:
0.0f, 0.0f,
1.0f, 1.0f,
1.0f, 0.0f,
//Triangle 5:
0.0f, 1.0f,
1.0f, 1.0f,
0.0f, 0.0f,
//Triangle 6:
0.0f, 0.0f,
1.0f, 1.0f,
1.0f, 0.0f,
//Triangle 7:
0.0f, 1.0f,
1.0f, 1.0f,
0.0f, 0.0f,
//Triangle 8:
0.0f, 0.0f,
1.0f, 1.0f,
1.0f, 0.0f
};
pVertex = ByteBuffer.allocateDirect(48*4).order(ByteOrder.nativeOrder()).asFloatBuffer();
(...)
pTexCoord = ByteBuffer.allocateDirect(48*4).order(ByteOrder.nativeOrder()).asFloatBuffer();
(...)
GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, 24);
(...)
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