media: Convert I420 VideoFrame to UYVY GpuMemoryBuffer.

media/blink/skcanvas_video_renderer.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/blink/skcanvas_video_renderer.h"
 
 #include "gpu/GLES2/gl2extchromium.h"
 #include "gpu/command_buffer/client/gles2_interface.h"
 #include "gpu/command_buffer/common/mailbox_holder.h"
 #include "media/base/video_frame.h"
@@ skipping 120 matching lines @@
   return !video_frame->HasTextures() ||
          media::VideoFrame::NumPlanes(video_frame->format()) != 1 ||
          video_frame->mailbox_holder(0).texture_target != GL_TEXTURE_2D;
 }
 
 // Creates a SkImage from a |video_frame| backed by native resources.
 // The SkImage will take ownership of the underlying resource.
 skia::RefPtr<SkImage> NewSkImageFromVideoFrameNative(
     VideoFrame* video_frame,
     const Context3D& context_3d) {
-  DCHECK_EQ(PIXEL_FORMAT_ARGB, video_frame->format());
+  DCHECK(PIXEL_FORMAT_ARGB == video_frame->format() ||
+         PIXEL_FORMAT_UYVY == video_frame->format());

[reveman, 2015/08/21 21:53:03]

and why this change?

[Daniele Castagna, 2015/08/21 22:46:04]

Same as the above, if the VideoFrame gets converted to GMBs, it can end up in
PIXEL_FORMAT_UYVY format.

[reveman, 2015/08/22 14:04:46]

what is this format used for? determines how to sample from the native textures
or something else?

 
   const gpu::MailboxHolder& mailbox_holder = video_frame->mailbox_holder(0);
   DCHECK(mailbox_holder.texture_target == GL_TEXTURE_2D ||
          mailbox_holder.texture_target == GL_TEXTURE_RECTANGLE_ARB ||
          mailbox_holder.texture_target == GL_TEXTURE_EXTERNAL_OES)
       << mailbox_holder.texture_target;
 
   gpu::gles2::GLES2Interface* gl = context_3d.gl;
   unsigned source_texture = 0;
   if (mailbox_holder.texture_target != GL_TEXTURE_2D) {
@@ skipping 432 matching lines @@
   video_frame->UpdateReleaseSyncPoint(&client);
 }
 
 void SkCanvasVideoRenderer::ResetCache() {
   // Clear cached values.
   last_image_ = nullptr;
   last_timestamp_ = kNoTimestamp();
 }
 
 }  // namespace media