如果 SurfaceView 大小不是受支持的大小之一，camera2 将崩溃

Question

当使用 SurfaceHolder/SurfaceView 配置 CaptureSession 时，我希望 SurfaceView 可以具有任何布局大小，而我通过 surfaceView.getHolder( ).setFixedSize(preview_width, preview_height).结果应该是传入的预览缓冲区可能会缩小到布局大小。

但是在 camera2 - 硬件级别 LEGACY - 中，配置 CaptureSession 只有在我使用与 streamConfigurationMap.getOutputSizes(SurfaceHolder.class).否则，图片不会缩小，但配置会报错。

/**
 * Prerequisites:
 * - The device must be opened.
 * - The surface view must be ready.
 */
protected void init() {

    // ...

    try {

        CameraCaptureSession.StateCallback cb = new CameraCaptureSession.StateCallback() {

            // ...
        };

        // The following line will result in an error*, if the viewfinder has not the right size:
        cameraDevice.createCaptureSession(Arrays.asList(viewfinder.getHolder().getSurface(), imageReaderSmall.getSurface()), cb, null);
    }
    catch (CameraAccessException e) {

        // ...
    }
}

来自日志（Samsung Galaxy A3 '14，SDV v21）：

05-12 ...: Output sizes for SurfaceHolder.class: [1440x1080, 1280x720, 960x720, 880x720, 960x540, 720x540, 800x480, 720x480, 640x480, 528x432, 352x288, 320x240, 176x144]
...
05-12 ... I/CameraManager: Using legacy camera HAL.
...
05-12 ... I/OpenGLRenderer: Initialized EGL, version 1.4
05-12 ... D/OpenGLRenderer: Get maximum texture size. GL_MAX_TEXTURE_SIZE is 4096
05-12 ... D/OpenGLRenderer: Enabling debug mode 0
05-12 ....CameraActivity: Surface created
05-12 ....CameraActivity: Surface changed 4 540x405
*) 05-12 ... E/CameraDevice-0-LE: Surface with size (w=540, h=405) and format 0x4 is not valid, size not in valid set: [1440x1080, 1280x720, 960x720, 880x720, 960x540, 720x540, 800x480, 720x480, 640x480, 528x432, 352x288, 320x240, 176x144]
05-12 ... W/CameraDevice-JV-0: Stream configuration failed
05-12 ... E/CameraCaptureSession: Session 0: Failed to create capture session; configuration failed
...
05-12 ....CameraActivity: Configure failed!

使用 Nexus 5X，SDK v23，并在 surfaceHolder.setFixedSize() 之后等待 surfaceChanged() 调用，不在支持的输出尺寸列表中的预览尺寸没有错误，但是预览没有开始。来自日志：

05-12 08:47:10.052 ....CameraActivity: Surface created
05-12 08:47:10.053 ....CameraActivity: Surface changed 4 1455x1080
05-12 08:47:10.054 ....CameraActivity: Find preview size for 1455x1080 (1.347424:1) px
05-12 08:47:10.054 ....CameraActivity: Preview size 1600x1200 px
05-12 08:47:10.070 ....CameraActivity: Surface changed 4 1600x1200
05-12 08:47:10.110 ....CameraActivity: Session started
05-12 08:47:10.163 ....CameraActivity: Surface: Surface(name=null)/@0xec338e5

结果：预览没有开始，我可以给surface view一个背景色来演示一下。

如何解决这个问题并仍然使用比使用 SurfaceTexture 性能更高且向后兼容的 SurfaceView。

Answer 1

调用 setFixedSize 后，您需要等待 surfaceChanged() 回调再次触发，然后才能创建相机捕获会话。

setFixedSize 对必要的 SurfaceView 更改进行排队，但不会立即生效。

如果 SurfaceView 大小不是受支持的大小之一，camera2 将崩溃

camera2 will crash if SurfaceView size is not one of the supported sizes

android

surfaceview

android-camera

android-camera2