Add metadata to media::VideoFrame and plumb it through IPC/MediaStream.

content/renderer/media/video_capture_impl.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.
 //
 // Notes about usage of this object by VideoCaptureImplManager.
 //
 // VideoCaptureImplManager access this object by using a Unretained()
 // binding and tasks on the IO thread. It is then important that
 // VideoCaptureImpl never post task to itself. All operations must be
 // synchronous.
@@ skipping 190 matching lines @@
   ClientBufferMap::iterator iter = client_buffers_.find(buffer_id);
   if (iter == client_buffers_.end())
     return;
 
   DCHECK(!iter->second.get() || iter->second->HasOneRef())
       << "Instructed to delete buffer we are still using.";
   client_buffers_.erase(iter);
 }
 
 void VideoCaptureImpl::OnBufferReceived(int buffer_id,
-                                        const media::VideoCaptureFormat& format,
+                                        const gfx::Size& coded_size,
                                         const gfx::Rect& visible_rect,
-                                        base::TimeTicks timestamp) {
+                                        base::TimeTicks timestamp,
+                                        const base::DictionaryValue& metadata) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
-  // The capture pipeline supports only I420 for now.
-  DCHECK_EQ(format.pixel_format, media::PIXEL_FORMAT_I420);
-
   if (state_ != VIDEO_CAPTURE_STATE_STARTED || suspended_) {
     Send(new VideoCaptureHostMsg_BufferReady(device_id_, buffer_id, 0));
     return;
   }
 
-  last_frame_format_ = format;
   if (first_frame_timestamp_.is_null())
     first_frame_timestamp_ = timestamp;
 
   // Used by chrome/browser/extension/api/cast_streaming/performance_test.cc
   TRACE_EVENT_INSTANT2(
       "cast_perf_test", "OnBufferReceived",
       TRACE_EVENT_SCOPE_THREAD,
       "timestamp", timestamp.ToInternalValue(),
       "time_delta", (timestamp - first_frame_timestamp_).ToInternalValue());
 
   ClientBufferMap::iterator iter = client_buffers_.find(buffer_id);
   DCHECK(iter != client_buffers_.end());
   scoped_refptr<ClientBuffer> buffer = iter->second;
   scoped_refptr<media::VideoFrame> frame =
       media::VideoFrame::WrapExternalPackedMemory(
           media::VideoFrame::I420,
-          last_frame_format_.frame_size,
+          coded_size,
           visible_rect,
           gfx::Size(visible_rect.width(), visible_rect.height()),
           reinterpret_cast<uint8*>(buffer->buffer->memory()),
           buffer->buffer_size,
           buffer->buffer->handle(),
           0,
           timestamp - first_frame_timestamp_,
           media::BindToCurrentLoop(
               base::Bind(&VideoCaptureImpl::OnClientBufferFinished,
                          weak_factory_.GetWeakPtr(),
                          buffer_id,
                          buffer,
                          0)));
+  frame->metadata()->MergeInternalValuesFrom(metadata);
 
-  for (ClientInfoMap::iterator it = clients_.begin(); it != clients_.end();
-       ++it) {
-    it->second.deliver_frame_cb.Run(frame, format, timestamp);
-  }
+  for (const auto& entry : clients_)
+    entry.second.deliver_frame_cb.Run(frame, timestamp);
 }
 
 void VideoCaptureImpl::OnMailboxBufferReceived(
     int buffer_id,
     const gpu::MailboxHolder& mailbox_holder,
-    const media::VideoCaptureFormat& format,
-    base::TimeTicks timestamp) {
+    const gfx::Size& packed_frame_size,
+    base::TimeTicks timestamp,
+    const base::DictionaryValue& metadata) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   if (state_ != VIDEO_CAPTURE_STATE_STARTED || suspended_) {
     Send(new VideoCaptureHostMsg_BufferReady(device_id_, buffer_id, 0));
     return;
   }
 
-  last_frame_format_ = format;
   if (first_frame_timestamp_.is_null())
     first_frame_timestamp_ = timestamp;
 
   scoped_refptr<media::VideoFrame> frame = media::VideoFrame::WrapNativeTexture(
       make_scoped_ptr(new gpu::MailboxHolder(mailbox_holder)),
       media::BindToCurrentLoop(base::Bind(
           &VideoCaptureImpl::OnClientBufferFinished, weak_factory_.GetWeakPtr(),
           buffer_id, scoped_refptr<ClientBuffer>())),
-      last_frame_format_.frame_size, gfx::Rect(last_frame_format_.frame_size),
-      last_frame_format_.frame_size, timestamp - first_frame_timestamp_, false);
+      packed_frame_size, gfx::Rect(packed_frame_size), packed_frame_size,
+      timestamp - first_frame_timestamp_, false);
+  frame->metadata()->MergeInternalValuesFrom(metadata);
 
-  for (ClientInfoMap::iterator it = clients_.begin(); it != clients_.end();
-       ++it) {
-    it->second.deliver_frame_cb.Run(frame, format, timestamp);
-  }
+  for (const auto& entry : clients_)
+    entry.second.deliver_frame_cb.Run(frame, timestamp);
 }
 
 void VideoCaptureImpl::OnClientBufferFinished(
     int buffer_id,
     const scoped_refptr<ClientBuffer>& /* ignored_buffer */,
     uint32 release_sync_point) {
   DCHECK(thread_checker_.CalledOnValidThread());
   Send(new VideoCaptureHostMsg_BufferReady(
       device_id_, buffer_id, release_sync_point));
 }
@@ skipping 131 matching lines @@
   ClientInfoMap::iterator it = clients->find(client_id);
   if (it != clients->end()) {
     it->second.state_update_cb.Run(VIDEO_CAPTURE_STATE_STOPPED);
     clients->erase(it);
     found = true;
   }
   return found;
 }
 
 }  // namespace content