MJPEG acceleration for video capture using VAAPI

content/browser/renderer_host/media/video_capture_device_client.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_DEVICE_CLIENT_H_
 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_DEVICE_CLIENT_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
+#include "base/synchronization/lock.h"
 #include "content/common/content_export.h"
 #include "media/video/capture/video_capture_device.h"
+#include "media/video/jpeg_decode_accelerator.h"
+
+namespace base {
+class WaitableEvent;
+}  // namespace base
 
 namespace content {
 class VideoCaptureBufferPool;
 class VideoCaptureController;
 
+struct CapturedData {

[wuchengli, 2015/04/14 09:41:44]

Can this be moved to video_capture_device_client.cc? Same for JpegDecodeTask.

[kcwu, 2015/04/14 20:02:35]

Done.

+  uint8* data;
+  int length;
+  media::VideoCaptureFormat frame_format;
+  int rotation;
+  base::TimeTicks timestamp;
+};
+
+// TODO(kcwu): convert to class

[wuchengli, 2015/04/14 09:41:44]

Remove. Make it a class.

[kcwu, 2015/04/14 20:02:34]

Done.

+struct JpegDecodeTask {

[wuchengli, 2015/04/14 09:41:44]

s/JpegDecodeTask/JpegDecodeData/ is better. A task sounds like it can be run.

[kcwu, 2015/04/14 20:02:35]

Done.

+  JpegDecodeTask();
+
+  base::Lock lock_;
+
+  bool decoding;
+
+  CapturedData captured_data;
+
+  scoped_ptr<base::SharedMemory> in_shared_memory;

[wuchengli, 2015/04/14 09:41:44]

Need variable comments for JpegDecodeTask and CapturedData.

[kcwu, 2015/04/16 14:38:27]

Done.

+  // |in_buffer| is backed by |in_shared_memory|.
+  scoped_ptr<media::BitstreamBuffer> in_buffer;
+
+  scoped_refptr<media::VideoCaptureDevice::Client::Buffer> out_buffer;
+  // |out_frame| is backed by |out_buffer|.
+  scoped_refptr<media::VideoFrame> out_frame;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(JpegDecodeTask);
+};
+
 // Receives events from the VideoCaptureDevice and posts them to a |controller_|
 // on the IO thread. An instance of this class may safely outlive its target
 // VideoCaptureController. This is a shallow class meant to convert incoming
 // frames and holds no significant state.
 //
-// Methods of this class may be called from any thread, and in practice will
-// often be called on some auxiliary thread depending on the platform and the
-// device type; including, for example, the DirectShow thread on Windows, the
-// v4l2_thread on Linux, and the UI thread for tab capture.
+// Methods of this class may be called from any thread if not specified, and in
+// practice will often be called on some auxiliary thread depending on the
+// platform and the device type; including, for example, the DirectShow thread
+// on Windows, the v4l2_thread on Linux, and the UI thread for tab capture.
 class CONTENT_EXPORT VideoCaptureDeviceClient
-    : public media::VideoCaptureDevice::Client {
+    : public media::VideoCaptureDevice::Client,
+      public media::JpegDecodeAccelerator::Client {
  public:
   VideoCaptureDeviceClient(
       const base::WeakPtr<VideoCaptureController>& controller,
       const scoped_refptr<VideoCaptureBufferPool>& buffer_pool);
   ~VideoCaptureDeviceClient() override;
 
   // VideoCaptureDevice::Client implementation.
+  bool InitializeJpegDecoder() override;
   void OnIncomingCapturedData(
       const uint8* data,
       int length,
       const media::VideoCaptureFormat& frame_format,
       int rotation,
       const base::TimeTicks& timestamp) override;
   scoped_refptr<Buffer> ReserveOutputBuffer(media::VideoFrame::Format format,
                                             const gfx::Size& size) override;
   void OnIncomingCapturedVideoFrame(
       const scoped_refptr<Buffer>& buffer,
       const scoped_refptr<media::VideoFrame>& frame,
       const base::TimeTicks& timestamp) override;
   void OnError(const std::string& reason) override;
   void OnLog(const std::string& message) override;
 
+  // JpegDecodeAccelerator::Client implementation.
+  // These will be called in IO thread.
+  virtual void VideoFrameReady(int32_t buffer_id) override;
+  virtual void NotifyError(int32_t buffer_id,
+                           media::JpegDecodeAccelerator::Error error) override;
+
  private:
+  // TODO(kcwu): better name
+  void OnIncomingCapturedData2(const CapturedData& captured_data);
+  bool PrepareJpegDecode(const CapturedData& captured_data,
+                         const scoped_refptr<Buffer> out_buffer);
+
   // The controller to which we post events.
   const base::WeakPtr<VideoCaptureController> controller_;
 
+  bool jpeg_failed_;

[wuchengli, 2015/04/14 09:41:44]

Remove this. Let's not do fallback now. If a platform supports Jpeg HW decode,
it shouldn't fail.

[kcwu, 2015/04/16 14:38:27]

Removed. But still do fallback. Some kind of fallback is necessary -- consider
if an user pluged in an external camera and the hardware cannot handle the JPEG
from the camera.

+  scoped_ptr<media::JpegDecodeAccelerator> jpeg_decoder_;
+  JpegDecodeTask jpeg_decode_task_;

[wuchengli, 2015/04/14 09:41:44]

Put all jpeg variables together. Move these beside |next_bitstream_buffer_id_|.

[kcwu, 2015/04/14 20:02:34]

Done.

+
   // The pool of shared-memory buffers used for capturing.
   const scoped_refptr<VideoCaptureBufferPool> buffer_pool_;
 
   media::VideoPixelFormat last_captured_pixel_format_;
 
+  int32 next_bitstream_buffer_id_;

[wuchengli, 2015/04/14 09:41:44]

Better to have jpeg in the name.
s/next_bitstream_buffer_id_/next_jpeg_buffer_id_/?

[kcwu, 2015/04/14 20:02:34]

Done.

+
   DISALLOW_COPY_AND_ASSIGN(VideoCaptureDeviceClient);
 };
 
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_DEVICE_CLIENT_H_