Support external buffer import in VDA interface and add a V4L2SVDA impl.

media/filters/gpu_video_decoder.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 "media/filters/gpu_video_decoder.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 523 matching lines @@
     visible_rect = picture.visible_rect();
   }
   if (!gfx::Rect(pb.size()).Contains(visible_rect)) {
     LOG(WARNING) << "Visible size " << visible_rect.ToString()
                  << " is larger than coded size " << pb.size().ToString();
     visible_rect = gfx::Rect(pb.size());
   }
 
   DCHECK(decoder_texture_target_);
 
-  bool opaque = IsOpaque(config_.format());
+  VideoPixelFormat pixel_format = vda_->GetOutputFormat();
+  if (pixel_format == PIXEL_FORMAT_UNKNOWN) {
+    pixel_format =
+        IsOpaque(config_.format()) ? PIXEL_FORMAT_XRGB : PIXEL_FORMAT_ARGB;
+  }
 
   scoped_refptr<VideoFrame> frame(VideoFrame::WrapNativeTexture(
-      opaque ? PIXEL_FORMAT_XRGB : PIXEL_FORMAT_ARGB,
-      gpu::MailboxHolder(pb.texture_mailbox(0), gpu::SyncToken(),
-                         decoder_texture_target_),
+      pixel_format, gpu::MailboxHolder(pb.texture_mailbox(0), gpu::SyncToken(),
+                                       decoder_texture_target_),
       BindToCurrentLoop(base::Bind(
           &GpuVideoDecoder::ReleaseMailbox, weak_factory_.GetWeakPtr(),
           factories_, picture.picture_buffer_id(), pb.texture_ids())),
       pb.size(), visible_rect, natural_size, timestamp));
   if (!frame) {
     DLOG(ERROR) << "Create frame failed for: " << picture.picture_buffer_id();
     NotifyError(VideoDecodeAccelerator::PLATFORM_FAILURE);
     return;
   }
   if (picture.allow_overlay())
@@ skipping 204 matching lines @@
   }
   return false;
 }
 
 void GpuVideoDecoder::DCheckGpuVideoAcceleratorFactoriesTaskRunnerIsCurrent()
     const {
   DCHECK(factories_->GetTaskRunner()->BelongsToCurrentThread());
 }
 
 }  // namespace media