Use FFmpegVideoDecoder from a UtilityProcess

media/base/video_frame_pool.cc

 // Copyright 2013 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/base/video_frame_pool.h"
 
 #include <list>
 
 #include "base/bind.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/synchronization/lock.h"
 
 namespace media {
 
 class VideoFramePool::PoolImpl
     : public base::RefCountedThreadSafe<VideoFramePool::PoolImpl> {
  public:
   PoolImpl();
 
   // See VideoFramePool::CreateFrame() for usage.
   scoped_refptr<VideoFrame> CreateFrame(VideoPixelFormat format,
                                         const gfx::Size& coded_size,
                                         const gfx::Rect& visible_rect,
                                         const gfx::Size& natural_size,
-                                        base::TimeDelta timestamp);
+                                        base::TimeDelta timestamp,
+                                        VideoFramePoolDelegate* delegate);
 
   // Shuts down the frame pool and releases all frames in |frames_|.
   // Once this is called frames will no longer be inserted back into
   // |frames_|.
   void Shutdown();
 
   size_t GetPoolSizeForTesting() const { return frames_.size(); }
 
  private:
   friend class base::RefCountedThreadSafe<VideoFramePool::PoolImpl>;
@@ skipping 15 matching lines @@
 
 VideoFramePool::PoolImpl::~PoolImpl() {
   DCHECK(is_shutdown_);
 }
 
 scoped_refptr<VideoFrame> VideoFramePool::PoolImpl::CreateFrame(
     VideoPixelFormat format,
     const gfx::Size& coded_size,
     const gfx::Rect& visible_rect,
     const gfx::Size& natural_size,
-    base::TimeDelta timestamp) {
+    base::TimeDelta timestamp,
+    VideoFramePoolDelegate* delegate) {
   base::AutoLock auto_lock(lock_);
   DCHECK(!is_shutdown_);
 
   scoped_refptr<VideoFrame> frame;
   while (!frame.get() && !frames_.empty()) {
       scoped_refptr<VideoFrame> pool_frame = frames_.front();
       frames_.pop_front();
 
       if (pool_frame->format() == format &&
           pool_frame->coded_size() == coded_size &&
           pool_frame->visible_rect() == visible_rect &&
           pool_frame->natural_size() == natural_size) {
         frame = pool_frame;
         frame->set_timestamp(timestamp);
         frame->metadata()->Clear();
         break;
       }
   }
 
   if (!frame.get()) {
-    frame = VideoFrame::CreateZeroInitializedFrame(
-        format, coded_size, visible_rect, natural_size, timestamp);
+    if (delegate) {
+      frame = delegate->CreateZeroInitializedFrame(
+          format, coded_size, visible_rect, natural_size, timestamp);
+    } else {

[sandersd (OOO until July 31), 2016/12/15 00:38:01]

These conditions can be removed by creating a default video frame provider that
is backed by VideoFrame.

+      frame = VideoFrame::CreateZeroInitializedFrame(
+          format, coded_size, visible_rect, natural_size, timestamp);
+    }
+
     // This can happen if the arguments are not valid.
     if (!frame) {
       LOG(ERROR) << "Failed to create a video frame";
       return nullptr;
     }
   }
 
-  scoped_refptr<VideoFrame> wrapped_frame = VideoFrame::WrapVideoFrame(
-      frame, frame->format(), frame->visible_rect(), frame->natural_size());
+  scoped_refptr<VideoFrame> wrapped_frame;
+  if (delegate) {
+    wrapped_frame = delegate->WrapVideoFrame(frame);
+  } else {
+    wrapped_frame = VideoFrame::WrapVideoFrame(
+        frame, frame->format(), frame->visible_rect(), frame->natural_size());
+  }
+
   wrapped_frame->AddDestructionObserver(
       base::Bind(&VideoFramePool::PoolImpl::FrameReleased, this, frame));
   return wrapped_frame;
 }
 
 void VideoFramePool::PoolImpl::Shutdown() {
   base::AutoLock auto_lock(lock_);
   is_shutdown_ = true;
   frames_.clear();
 }
 
 void VideoFramePool::PoolImpl::FrameReleased(
     const scoped_refptr<VideoFrame>& frame) {
   base::AutoLock auto_lock(lock_);
   if (is_shutdown_)
     return;
 
   frames_.push_back(frame);
 }
 
-VideoFramePool::VideoFramePool() : pool_(new PoolImpl()) {
-}
+VideoFramePool::VideoFramePool() : pool_(new PoolImpl()), delegate_(nullptr) {}
 
 VideoFramePool::~VideoFramePool() {
   pool_->Shutdown();
 }
 
 scoped_refptr<VideoFrame> VideoFramePool::CreateFrame(
     VideoPixelFormat format,
     const gfx::Size& coded_size,
     const gfx::Rect& visible_rect,
     const gfx::Size& natural_size,
     base::TimeDelta timestamp) {
   return pool_->CreateFrame(format, coded_size, visible_rect, natural_size,
-                            timestamp);
+                            timestamp, delegate_.get());
+}
+
+void VideoFramePool::SetDelegate(
+    std::unique_ptr<VideoFramePoolDelegate> delegate) {
+  delegate_ = std::move(delegate);
 }
 
 size_t VideoFramePool::GetPoolSizeForTesting() const {
   return pool_->GetPoolSizeForTesting();
 }
 
 }  // namespace media