Add support for Tegra V4L2 VDA

content/common/gpu/media/v4l2_video_decode_accelerator.h

 // Copyright 2014 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.
 //
 // This file contains an implementation of VideoDecodeAccelerator
 // that utilizes hardware video decoders, which expose Video4Linux 2 API
 // (http://linuxtv.org/downloads/v4l-dvb-apis/).
 
 #ifndef CONTENT_COMMON_GPU_MEDIA_V4L2_VIDEO_DECODE_ACCELERATOR_H_
 #define CONTENT_COMMON_GPU_MEDIA_V4L2_VIDEO_DECODE_ACCELERATOR_H_
@@ skipping 137 matching lines @@
     off_t bytes_used;       // bytes filled in the mmap() segment.
     int32 input_id;         // triggering input_id as given to Decode().
   };
 
   // Record for output buffers.
   struct OutputRecord {
     OutputRecord();
     ~OutputRecord();
     bool at_device;         // held by device.
     bool at_client;         // held by client.
-    int fds[2];             // file descriptors for each plane.
     EGLImageKHR egl_image;  // EGLImageKHR for the output buffer.
     EGLSyncKHR egl_sync;    // sync the compositor's use of the EGLImage.
     int32 picture_id;       // picture buffer id as returned to PictureReady().
     bool cleared;           // Whether the texture is cleared and safe to render
                             // from. See TextureManager for details.
   };
 
   //
   // Decoding tasks, to be run on decode_thread_.
   //
@@ skipping 118 matching lines @@
   // caller can error out on resolution change.
   bool DestroyOutputBuffers();
   void ResolutionChangeDestroyBuffers();
 
   // Send decoded pictures to PictureReady.
   void SendPictureReady();
 
   // Callback that indicates a picture has been cleared.
   void PictureCleared();
 
+  // This method determines whether a resolution change event processing
+  // is indeed required by returning true if either:
+  // - width or height of the new format is different than previous format.
+  // - V4L2_CID_MIN_BUFFERS_FOR_CAPTURE has changed.
+  // Returns false otherwise.
+  bool IsResolutionChangeNecessary();
+
   // Our original calling message loop for the child thread.
   scoped_refptr<base::MessageLoopProxy> child_message_loop_proxy_;
 
   // Message loop of the IO thread.
   scoped_refptr<base::MessageLoopProxy> io_message_loop_proxy_;
 
   // WeakPtr<> pointing to |this| for use in posting tasks from the decoder or
   // device worker threads back to the child thread.  Because the worker threads
   // are members of this class, any task running on those threads is guaranteed
   // that this object is still alive.  As a result, tasks posted from the child
@@ skipping 112 matching lines @@
 
   // Make our context current before running any EGL entry points.
   base::Callback<bool(void)> make_context_current_;
 
   // EGL state
   EGLDisplay egl_display_;
 
   // The codec we'll be decoding for.
   media::VideoCodecProfile video_profile_;
 
+  // Stores the number of planes (i.e. separate memory buffers) for output.
+  uint8 output_planes_count_;

[Pawel Osciak, 2014/03/28 06:21:46]

s/uint8/size_t/

[shivdasp, 2014/03/28 06:40:43]

Done.

+
   DISALLOW_COPY_AND_ASSIGN(V4L2VideoDecodeAccelerator);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_MEDIA_V4L2_VIDEO_DECODE_ACCELERATOR_H_