Add offset support to BitstreamBuffer.

content/common/gpu/media/vaapi_video_decode_accelerator.cc

 // Copyright (c) 2012 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.
 
 #include "content/common/gpu/media/vaapi_video_decode_accelerator.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/stl_util.h"
@@ skipping 429 matching lines @@
     const media::BitstreamBuffer& bitstream_buffer) {
   DCHECK_EQ(message_loop_, base::MessageLoop::current());
   TRACE_EVENT1("Video Decoder", "MapAndQueueNewInputBuffer", "input_id",
       bitstream_buffer.id());
 
   DVLOG(4) << "Mapping new input buffer id: " << bitstream_buffer.id()
            << " size: " << (int)bitstream_buffer.size();
 
   scoped_ptr<base::SharedMemory> shm(
       new base::SharedMemory(bitstream_buffer.handle(), true));
-  RETURN_AND_NOTIFY_ON_FAILURE(shm->Map(bitstream_buffer.size()),
-                              "Failed to map input buffer", UNREADABLE_INPUT,);
+  RETURN_AND_NOTIFY_ON_FAILURE(
+      shm->MapAt(bitstream_buffer.offset(), bitstream_buffer.size()),
+      "Failed to map input buffer", UNREADABLE_INPUT, );
 
   base::AutoLock auto_lock(lock_);
 
   // Set up a new input buffer and queue it for later.
   linked_ptr<InputBuffer> input_buffer(new InputBuffer());
   input_buffer->shm.reset(shm.release());
   input_buffer->id = bitstream_buffer.id();
   input_buffer->size = bitstream_buffer.size();
 
   ++num_stream_bufs_at_decoder_;
@@ skipping 1277 matching lines @@
   return vaapi_pic->dec_surface();
 }
 
 // static
 media::VideoDecodeAccelerator::SupportedProfiles
 VaapiVideoDecodeAccelerator::GetSupportedProfiles() {
   return VaapiWrapper::GetSupportedDecodeProfiles();
 }
 
 }  // namespace content