Revert of Android: Make base interface for camera1 and camera2

webrtc/api/java/android/org/webrtc/CameraVideoCapturer.java

-/*
- *  Copyright 2016 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-package org.webrtc;
-
-/**
- * Base interface for camera1 and camera2 implementations. Extends VideoCapturer with a
- * switchCamera() function. Also provides subinterfaces for handling camera events, and a helper
- * class for detecting camera freezes.
- */
-public interface CameraVideoCapturer extends VideoCapturer {
-  /**
-   * Camera events handler - can be used to be notifed about camera events. The callbacks are
-   * executed from an arbitrary thread.
-   */
-  public interface CameraEventsHandler {
-    // Camera error handler - invoked when camera can not be opened
-    // or any camera exception happens on camera thread.
-    void onCameraError(String errorDescription);
-
-    // Invoked when camera stops receiving frames.
-    void onCameraFreezed(String errorDescription);
-
-    // Callback invoked when camera is opening.
-    void onCameraOpening(int cameraId);
-
-    // Callback invoked when first camera frame is available after camera is started.
-    void onFirstFrameAvailable();
-
-    // Callback invoked when camera is closed.
-    void onCameraClosed();
-  }
-
-  /**
-   * Camera switch handler - one of these functions are invoked with the result of switchCamera().
-   * The callback may be called on an arbitrary thread.
-   */
-  public interface CameraSwitchHandler {
-    // Invoked on success. |isFrontCamera| is true if the new camera is front facing.
-    void onCameraSwitchDone(boolean isFrontCamera);
-
-    // Invoked on failure, e.g. camera is stopped or only one camera available.
-    void onCameraSwitchError(String errorDescription);
-  }
-
-  /**
-   * Switch camera to the next valid camera id. This can only be called while the camera is running.
-   * This function can be called from any thread.
-   */
-  void switchCamera(CameraSwitchHandler switchEventsHandler);
-
-  /**
-   * Helper class to log framerate and detect if the camera freezes. It will run periodic callbacks
-   * on the SurfaceTextureHelper thread passed in the ctor, and should only be operated from that
-   * thread.
-   */
-  public static class CameraStatistics {
-    private final static String TAG = "CameraStatistics";
-    private final static int CAMERA_OBSERVER_PERIOD_MS = 2000;
-    private final static int CAMERA_FREEZE_REPORT_TIMOUT_MS = 4000;
-
-    private final SurfaceTextureHelper surfaceTextureHelper;
-    private final CameraEventsHandler eventsHandler;
-    private int frameCount;
-    private int freezePeriodCount;
-    // Camera observer - monitors camera framerate. Observer is executed on camera thread.
-    private final Runnable cameraObserver = new Runnable() {
-      @Override
-      public void run() {
-        final int cameraFps = Math.round(frameCount * 1000.0f / CAMERA_OBSERVER_PERIOD_MS);
-        Logging.d(TAG, "Camera fps: " + cameraFps +".");
-        if (frameCount == 0) {
-          ++freezePeriodCount;
-          if (CAMERA_OBSERVER_PERIOD_MS * freezePeriodCount >= CAMERA_FREEZE_REPORT_TIMOUT_MS
-              && eventsHandler != null) {
-            Logging.e(TAG, "Camera freezed.");
-            if (surfaceTextureHelper.isTextureInUse()) {
-              // This can only happen if we are capturing to textures.
-              eventsHandler.onCameraFreezed("Camera failure. Client must return video buffers.");
-            } else {
-              eventsHandler.onCameraFreezed("Camera failure.");
-            }
-            return;
-          }
-        } else {
-          freezePeriodCount = 0;
-        }
-        frameCount = 0;
-        surfaceTextureHelper.getHandler().postDelayed(this, CAMERA_OBSERVER_PERIOD_MS);
-      }
-    };
-
-    public CameraStatistics(
-        SurfaceTextureHelper surfaceTextureHelper, CameraEventsHandler eventsHandler) {
-      if (surfaceTextureHelper == null) {
-        throw new IllegalArgumentException("SurfaceTextureHelper is null");
-      }
-      this.surfaceTextureHelper = surfaceTextureHelper;
-      this.eventsHandler = eventsHandler;
-      this.frameCount = 0;
-      this.freezePeriodCount = 0;
-      surfaceTextureHelper.getHandler().postDelayed(cameraObserver, CAMERA_OBSERVER_PERIOD_MS);
-    }
-
-    private void checkThread() {
-      if (Thread.currentThread() != surfaceTextureHelper.getHandler().getLooper().getThread()) {
-        throw new IllegalStateException("Wrong thread");
-      }
-    }
-
-    public void addFrame() {
-      checkThread();
-      ++frameCount;
-    }
-
-    public void release() {
-      checkThread();
-      surfaceTextureHelper.getHandler().removeCallbacks(cameraObserver);
-    }
-  }
-}