使用 Grafika CameraCapture 代码拉伸(stretch)的 Android 相机预览

Question

我正在寻求帮助解决我在使用 Grafika's CameraCaptureActivity 时遇到的问题代码。我想构建一个可以记录相机并显示预览的应用程序，所以这个示例和代码看起来正是我想要的，到目前为止一切都很好，这个问题的应用程序。

我遇到的问题是，当相机预览大小与我用来显示预览的 GLSurfaceView 的确切大小不匹配时，它会显示拉伸(stretch)的预览。

这是它的样子:

正如您所见，它被水平拉伸(stretch)了，因为笔记纸是一个完美的正方形。

对于三星 Galaxy S4 上的这个精确示例，相机预览尺寸为 1280x720(使用 Camera2 API 从可用预览尺寸中提取)，GLSurfaceView 为 1920x1080 以覆盖整个屏幕。

什么时候出现？

当 SurfaceView 相对于 Camera 输出放大时会出现问题，即使我始终确保比率保持正确 (1920x1080 = 1,5 * 1280x720) .

您使用的是什么代码？

我使用Grafika的代码，包括:

• CameraCaptureActivity
• AspectFrameLayout
• FullFrameRect
• Drawable2d
• EglCore
• EglBaseSurface

一些日志？

这是 SurfaceFlinger 转储的样子:

Hardware Composer state (version 01030000):
  mDebugForceFakeVSync=0
  Display[0] configurations (* current):
    * 0: 1080x1920, xdpi=442.450989, ydpi=439.351013, secure=1 refresh=16666667
  numHwLayers=3, flags=00000000
    type   |  handle  | hint | flag | tr | blnd |  format     |     source crop(l,t,r,b)       |           frame        |      dirtyRect         |  name 
------------+----------+----------+----------+----+-------+----------+-----------------------------------+---------------------------+-------------------
       HWC | b3b12ba0 | 0002 | 0000 | 00 | 0100 | RGB_888     |    0.0,    0.0, 1080.0, 1920.0 |    0,    0, 1080, 1920 | [    0,    0, 1080, 1920] | SurfaceView
       HWC | b3d12740 | 0002 | 0000 | 00 | 0105 | RGBA_8888   |    0.0,    0.0, 1065.0, 1905.0 |    0,    0, 1065, 1905 | [    0,    0, 1065, 1905] | com.mybundle.myapp/com.mybundle.myapp.activity.MyActivity
 FB TARGET | b6a55c40 | 0000 | 0000 | 00 | 0105 | RGBA_8888   |    0.0,    0.0, 1080.0, 1920.0 |    0,    0, 1080, 1920 | [    0,    0,    0,    0] | HWC_FRAMEBUFFER_TARGET

Layer 0xb4094000 (SurfaceView)
  Region transparentRegion (this=0xb4094160, count=1)
    [  0,   0,   0,   0]
  Region visibleRegion (this=0xb4094008, count=1)
    [  0,   0, 1920, 1080]
      layerStack=   0, z=    21015, pos=(0,0), size=(1920,1080), crop=(   0,   0,1920,1080), isOpaque=1, invalidate=0, alpha=0xff, flags=0x00000002, tr=[1.00, 0.00][0.00, 1.00]
      client=0xb66190c0
      format= 4, activeBuffer=[1080x1920:1536,  3], queued-frames=0, mRefreshPending=0
            mTexName=116 mCurrentTexture=0
            mCurrentCrop=[0,0,0,0] mCurrentTransform=0x7
            mAbandoned=0
            -BufferQueue mMaxAcquiredBufferCount=1, mDequeueBufferCannotBlock=0, default-size=[1920x1080], default-format=4, transform-hint=04, FIFO(0)={}
            >[00:0xb1c18500] state=ACQUIRED, 0xb3b12ba0 [1080x1920:1536,  3]

相机预览尺寸代码？

StreamConfigurationMap map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);

// Retrieve display size
WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();
Point displaySize = new Point();
display.getSize(displaySize);

// Choose the sizes for camera preview
mPreviewSize = chooseOptimalSize(map.getOutputSizes(SurfaceTexture.class),
                    displaySize.x, displaySize.y, captureWidth, captureHeight);

private static Size chooseOptimalSize(Size[] choices, int screenWidth, int screenHeight, int captureWidth, int captureHeight)
    {
        // Collect the supported resolutions that are at least as big as the screen && wanted capture size
        List<Size> bigEnough = new ArrayList<>();
        // Collect the supported resolutions that are at least as big as the wanted capture size but < to screensize
        List<Size> smallerButEnough = new ArrayList<>();

        for (Size option : choices) {
            if (option.getHeight() == option.getWidth() * captureHeight / captureWidth) {
                if( option.getWidth() >= screenWidth && option.getHeight() >= screenHeight )
                {
                    bigEnough.add(option);
                }
                else
                {
                    smallerButEnough.add(option);
                }
            }
        }

        // Pick the smallest of those, assuming we found any
        if (bigEnough.size() > 0)
        {
            return Collections.min(bigEnough, new CompareSizesByArea());
        }
        // Pick the biggest of those, assuming we found any
        else if( smallerButEnough.size() > 0 )
        {
            return Collections.max(smallerButEnough, new CompareSizesByArea());
        }
        else
        {
            Log.e(TAG, "Couldn't find any suitable preview size");
            return choices[0];
        }
    }

你尝试了什么？

我一开始以为是 Camera2 的问题，所以我尝试只使用旧的 Camera API，但结果是一样的。

然后我以为是比例问题，但是你可以看到这里的比例水平和垂直都还可以。

我敢打赌，在调整 Surface 大小时会应用 OpenGL 转换，但我是 OpenGL 的菜鸟，所以我找不到任何有用的方法。我尝试添加这些行，但没有帮助:

@Override
public void onSurfaceChanged(GL10 gl, int width, int height) {
    Log.d(TAG, "onSurfaceChanged " + width + "x" + height);

    gl.glViewport(0, 0, width, height);
    gl.glClear(GLES10.GL_COLOR_BUFFER_BIT | GLES10.GL_DEPTH_BUFFER_BIT);
}

另一个例子，来自 Grafika:

这是问题的另一个示例，直接来自 Grafika 应用程序。

手机:Galaxy S3 Neo(GT-I9301L)- Android 4.4.2

手机有一个 1280x720 屏幕，相机以 640x480 分辨率打开，以 573x430 显示。这是它的样子:

SurfaceFlinger 日志:

Hardware Composer state (version  1030000):
  mDebugForceFakeVSync=0
  Display[0] : 720x1280, xdpi=304.799011, ydpi=306.716003, refresh=16666667
  numHwLayers=4, flags=00000000
    type    |  handle  |   hints  |   flags  | tr | blend |  format  |          source crop            |           frame           name 
------------+----------+----------+----------+----+-------+----------+---------------------------------+--------------------------------
        HWC | b84a3d18 | 00000002 | 00000000 | 00 | 00100 | 00000002 | [    0.0,    0.0,  430.0,  573.0] | [   32,  353,  462,  926] SurfaceView
        HWC | b841b080 | 00000002 | 00000000 | 00 | 00105 | 00000001 | [    0.0,    0.0,  670.0, 1280.0] | [    0,    0,  670, 1280] com.android.grafika/com.android.grafika.CameraCaptureActivity
        HWC | b8423250 | 00000002 | 00000000 | 00 | 00105 | 00000001 | [    0.0,    0.0,   50.0, 1280.0] | [  670,    0,  720, 1280] StatusBar
  FB TARGET | b8412d50 | 00000000 | 00000000 | 00 | 00105 | 00000001 | [    0.0,    0.0,  720.0, 1280.0] | [    0,    0,  720, 1280] HWC_FRAMEBUFFER_TARGET


+ Layer 0xb8416080 (SurfaceView) id=112
  Region transparentRegion (this=0xb84169d0, count=1)
    [  0,   0,   0,   0]
  Region visibleRegion (this=0xb8416088, count=1)
    [353, 258, 926, 688]
      layerStack=   0, z=    21015, pos=(353,258), size=( 573, 430), crop=(   0,   0, 573, 430), isOpaque=1, invalidate=0, alpha=0xff, flags=0x00000000, tr=[1.00, 0.00][0.00, 1.00]
      client=0xb841d7c8
      format= 4, activeBuffer=[ 430x 573: 448,  2], queued-frames=0, mRefreshPending=0
            mTexName=95 mCurrentTexture=1
            mCurrentCrop=[0,0,0,0] mCurrentTransform=0x7
            mAbandoned=0
            -BufferQueue mMaxAcquiredBufferCount=1, mDequeueBufferCannotBlock=0, default-size=[573x430], default-format=4, transform-hint=04, FIFO(0)={}
             [00:0xb84439a8] state=FREE    , 0xb849a528 [ 430x 573: 448,  2]
            >[01:0xb8421128] state=ACQUIRED, 0xb84a3d18 [ 430x 573: 448,  2]
             [02:0xb84238e8] state=FREE    , 0xb84432f8 [ 430x 573: 448,  2]

Grafika 的应用日志:

04-18 18:06:49.954 14383-14383/com.android.grafika D/Grafika: onCreate complete: com.android.grafika.CameraCaptureActivity@42adc288
04-18 18:06:49.954 14383-14383/com.android.grafika D/Grafika: onResume -- acquiring camera
04-18 18:06:50.064 14383-14383/com.android.grafika D/Grafika: Camera preferred preview size for video is 1920x1080
04-18 18:06:50.064 14383-14383/com.android.grafika D/Grafika-AFL: Setting aspect ratio to 1.3333333333333333 (was -1.0)
04-18 18:06:50.064 14383-14383/com.android.grafika D/Grafika: onResume complete: com.android.grafika.CameraCaptureActivity@42adc288
04-18 18:06:50.064 14383-32312/com.android.grafika D/Grafika: setCameraPreviewSize
04-18 18:06:50.094 14383-14383/com.android.grafika D/Grafika-AFL: onMeasure target=1.3333333333333333 width=[MeasureSpec: EXACTLY 1216] height=[MeasureSpec: EXACTLY 526]
04-18 18:06:50.094 14383-14383/com.android.grafika D/Grafika-AFL: new size=701x526 + padding 0x0
04-18 18:06:50.094 14383-14383/com.android.grafika D/Grafika-AFL: onMeasure target=1.3333333333333333 width=[MeasureSpec: EXACTLY 1216] height=[MeasureSpec: EXACTLY 430]
04-18 18:06:50.094 14383-14383/com.android.grafika D/Grafika-AFL: new size=573x430 + padding 0x0
04-18 18:06:50.124 14383-32312/com.android.grafika D/Grafika: onSurfaceCreated
04-18 18:06:50.134 14383-32312/com.android.grafika D/Grafika: Created program 3 (TEXTURE_EXT)
04-18 18:06:50.144 14383-32312/com.android.grafika D/Grafika: onSurfaceChanged 573x430
04-18 18:06:50.144 14383-32312/com.android.grafika D/Grafika: Updating filter to 0
04-18 18:06:50.154 14383-14383/com.android.grafika D/Grafika: onItemSelected: 0
04-18 18:06:50.154 14383-14383/com.android.grafika D/Grafika: CameraHandler [Handler (com.android.grafika.CameraCaptureActivity$CameraHandler) {42aeec70}]: what=0
04-18 18:06:50.514 14383-14383/com.android.grafika D/Grafika-AFL: onMeasure target=1.3333333333333333 width=[MeasureSpec: EXACTLY 1216] height=[MeasureSpec: EXACTLY 526]
04-18 18:06:50.514 14383-14383/com.android.grafika D/Grafika-AFL: new size=701x526 + padding 0x0
04-18 18:06:50.514 14383-14383/com.android.grafika D/Grafika-AFL: onMeasure target=1.3333333333333333 width=[MeasureSpec: EXACTLY 1216] height=[MeasureSpec: EXACTLY 430]
04-18 18:06:50.514 14383-14383/com.android.grafika D/Grafika-AFL: new size=573x430 + padding 0x0
04-18 18:06:50.544 14383-14383/com.android.grafika D/AbsListView: onVisibilityChanged() is called, visibility : 4
04-18 18:06:50.544 14383-14383/com.android.grafika D/AbsListView: unregisterIRListener() is called 

所以...

如果你们中有人知道如何让它发挥作用，我很乐意听取他的意见。

谢谢!

Answer 1

我为我上次的回答感到抱歉，它很愚蠢并且没有解决问题。但我创建了另一个解决方案，并在 5 台使用不同相机宽高比的设备上对其进行了测试。据我了解，您正在使用 Grafika 代码。尝试删除 parms.setRecordingHint(true);所以现在我只使用param.setPictureSize()
param.setPreviewSize()在相机参数中具有相同的纵横比。我还用那个方面设置了 gl view 的大小，我自己做的。在 grafika 中它使用固定大小，afaik。希望对你有帮助。