Add offset support to BitstreamBuffer.

content/common/gpu/media/v4l2_jpeg_decode_accelerator.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_COMMON_GPU_MEDIA_V4L2_JPEG_DECODE_ACCELERATOR_H_
 #define CONTENT_COMMON_GPU_MEDIA_V4L2_JPEG_DECODE_ACCELERATOR_H_
 
 #include <queue>
 #include <vector>
 
 #include "base/memory/linked_ptr.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread.h"
 #include "content/common/content_export.h"
+#include "content/common/gpu/media/shared_memory_region.h"
 #include "content/common/gpu/media/v4l2_device.h"
 #include "media/base/bitstream_buffer.h"
 #include "media/base/video_frame.h"
 #include "media/video/jpeg_decode_accelerator.h"
 
 namespace content {
 
 class CONTENT_EXPORT V4L2JpegDecodeAccelerator
     : public media::JpegDecodeAccelerator {
  public:
@@ skipping 20 matching lines @@
     bool at_device;
   };
 
   // Job record. Jobs are processed in a FIFO order. This is separate from
   // BufferRecord of input, because a BufferRecord of input may be returned
   // before we dequeue the corresponding output buffer. It can't always be
   // associated with a BufferRecord of output immediately either, because at
   // the time of submission we may not have one available (and don't need one
   // to submit input to the device).
   struct JobRecord {
-    JobRecord(media::BitstreamBuffer bitstream_buffer,
+    JobRecord(const media::BitstreamBuffer& bitstream_buffer,
               scoped_refptr<media::VideoFrame> video_frame);
     ~JobRecord();
 
-    // Input image buffer.
-    media::BitstreamBuffer bitstream_buffer;
+    // Input image buffer ID.
+    int32_t bitstream_buffer_id;
+    // Memory mapped from |bitstream_buffer|.
+    SharedMemoryRegion shm;
     // Output frame buffer.
     scoped_refptr<media::VideoFrame> out_frame;
-    // Memory mapped from |bitstream_buffer|.
-    scoped_ptr<base::SharedMemory> shm;
   };
 
   void EnqueueInput();
   void EnqueueOutput();
   void Dequeue();
   bool EnqueueInputRecord();
   bool EnqueueOutputRecord();
   bool CreateInputBuffers();
   bool CreateOutputBuffers();
   void DestroyInputBuffers();
@@ skipping 91 matching lines @@
   // Point to |this| for use in posting tasks from the decoder thread back to
   // the ChildThread.
   base::WeakPtr<V4L2JpegDecodeAccelerator> weak_ptr_;
 
   DISALLOW_COPY_AND_ASSIGN(V4L2JpegDecodeAccelerator);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_MEDIA_V4L2_JPEG_DECODE_ACCELERATOR_H_