media/video/capture/android/video_capture_device_android.h

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef MEDIA_VIDEO_CAPTURE_ANDROID_VIDEO_CAPTURE_DEVICE_ANDROID_H_
   6 #define MEDIA_VIDEO_CAPTURE_ANDROID_VIDEO_CAPTURE_DEVICE_ANDROID_H_
   7
   8 #include <jni.h>
   9 #include <string>
  10
  11 #include "base/android/scoped_java_ref.h"
  12 #include "base/synchronization/lock.h"
  13 #include "base/threading/thread.h"
  14 #include "base/time/time.h"
  15 #include "media/base/media_export.h"
  16 #include "media/video/capture/video_capture_device.h"
  17
  18 namespace media {
  19
  20 // VideoCaptureDevice on Android. The VideoCaptureDevice API's are called
  21 // by VideoCaptureManager on its own thread, while OnFrameAvailable is called
  22 // on JAVA thread (i.e., UI thread). Both will access |state_| and |client_|,
  23 // but only VideoCaptureManager would change their value.
  24 class MEDIA_EXPORT VideoCaptureDeviceAndroid : public VideoCaptureDevice {
  25  public:
  26   // Automatically generated enum to interface with Java world.
  27   enum AndroidImageFormat {
  28 #define DEFINE_ANDROID_IMAGEFORMAT(name, value) name = value,
  29 #include "media/video/capture/android/imageformat_list.h"
  30 #undef DEFINE_ANDROID_IMAGEFORMAT
  31   };
  32
  33   virtual ~VideoCaptureDeviceAndroid();
  34
  35   static VideoCaptureDevice* Create(const Name& device_name);
  36   static bool RegisterVideoCaptureDevice(JNIEnv* env);
  37
  38   // VideoCaptureDevice implementation.
  39   virtual void AllocateAndStart(const VideoCaptureParams& params,
  40                                 scoped_ptr<Client> client) OVERRIDE;
  41   virtual void StopAndDeAllocate() OVERRIDE;
  42
  43   // Implement org.chromium.media.VideoCapture.nativeOnFrameAvailable.
  44   void OnFrameAvailable(
  45       JNIEnv* env,
  46       jobject obj,
  47       jbyteArray data,
  48       jint length,
  49       jint rotation);
  50
  51  private:
  52   enum InternalState {
  53     kIdle,  // The device is opened but not in use.
  54     kCapturing,  // Video is being captured.
  55     kError  // Hit error. User needs to recover by destroying the object.
  56   };
  57
  58   explicit VideoCaptureDeviceAndroid(const Name& device_name);
  59   bool Init();
  60   VideoPixelFormat GetColorspace();
  61   void SetErrorState(const std::string& reason);
  62
  63   // Prevent racing on accessing |state_| and |client_| since both could be
  64   // accessed from different threads.
  65   base::Lock lock_;
  66   InternalState state_;
  67   bool got_first_frame_;
  68   base::TimeTicks expected_next_frame_time_;
  69   base::TimeDelta frame_interval_;
  70   scoped_ptr<VideoCaptureDevice::Client> client_;
  71
  72   Name device_name_;
  73   VideoCaptureFormat capture_format_;
  74
  75   // Java VideoCaptureAndroid instance.
  76   base::android::ScopedJavaLocalRef<jobject> j_capture_;
  77
  78   DISALLOW_IMPLICIT_CONSTRUCTORS(VideoCaptureDeviceAndroid);
  79 };
  80
  81 }  // namespace media
  82
  83 #endif  // MEDIA_VIDEO_CAPTURE_ANDROID_VIDEO_CAPTURE_DEVICE_ANDROID_H_