Passing Texture backed VideoFrame through WebRTC wrappers

content/renderer/media/rtc_video_encoder.cc

Index: content/renderer/media/rtc_video_encoder.cc
diff --git a/content/renderer/media/rtc_video_encoder.cc b/content/renderer/media/rtc_video_encoder.cc
index cdadae55cd560cc65a60864302399a9afb21df07..995766aaef4e25b2ec6adf8fa439c8605429b9bf 100644
--- a/content/renderer/media/rtc_video_encoder.cc
+++ b/content/renderer/media/rtc_video_encoder.cc
@@ -13,6 +13,7 @@
 #include "base/single_thread_task_runner.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/thread_task_runner_handle.h"
+#include "media/base/bind_to_current_loop.h"
 #include "media/base/bitstream_buffer.h"
 #include "media/base/video_frame.h"
 #include "media/base/video_util.h"
@@ -422,8 +423,9 @@ void RTCVideoEncoder::Impl::BitstreamBufferReady(int32 bitstream_buffer_id,
   const int64 capture_time_us = webrtc::TickTime::MicrosecondTimestamp();
 
   // Derive the capture time (in ms) and RTP timestamp (in 90KHz ticks).
-  int64 capture_time_ms = capture_time_us / 1000;
-  uint32_t rtp_timestamp = static_cast<uint32_t>(capture_time_us * 90 / 1000);
+  const int64 capture_time_ms = capture_time_us / 1000;
+  const uint32_t rtp_timestamp =
+      static_cast<uint32_t>(capture_time_us * 90 / 1000);
 
   scoped_ptr<webrtc::EncodedImage> image(new webrtc::EncodedImage(
       reinterpret_cast<uint8_t*>(output_buffer->memory()),
@@ -481,7 +483,7 @@ void RTCVideoEncoder::Impl::EncodeOneFrame() {
   // Encode() gets destroyed early.  Handle this by resetting our
   // input_next_frame_* state before we hand off the VideoFrame to the VEA.
   const webrtc::VideoFrame* next_frame = input_next_frame_;
-  bool next_frame_keyframe = input_next_frame_keyframe_;
+  const bool next_frame_keyframe = input_next_frame_keyframe_;
   input_next_frame_ = NULL;
   input_next_frame_keyframe_ = false;
 
@@ -491,48 +493,49 @@ void RTCVideoEncoder::Impl::EncodeOneFrame() {
   }
 
   const int index = input_buffers_free_.back();
-  base::SharedMemory* input_buffer = input_buffers_[index];
-  scoped_refptr<media::VideoFrame> frame =
-      media::VideoFrame::WrapExternalSharedMemory(
-          media::VideoFrame::I420,
-          input_frame_coded_size_,
-          gfx::Rect(input_visible_size_),
-          input_visible_size_,
-          reinterpret_cast<uint8*>(input_buffer->memory()),
-          input_buffer->mapped_size(),
-          input_buffer->handle(),
-          0,
-          base::TimeDelta());
-  frame->AddDestructionObserver(
-      base::Bind(&RTCVideoEncoder::Impl::EncodeFrameFinished, this, index));
-  if (!frame.get()) {
-    DLOG(ERROR) << "Impl::EncodeOneFrame(): failed to create frame";
-    NOTIFY_ERROR(media::VideoEncodeAccelerator::kPlatformFailureError);
-    return;
-  }
-
-  // Do a strided copy of the input frame to match the input requirements for
-  // the encoder.
-  // TODO(sheu): support zero-copy from WebRTC.  http://crbug.com/269312
-  if (libyuv::I420Copy(next_frame->buffer(webrtc::kYPlane),
-                       next_frame->stride(webrtc::kYPlane),
-                       next_frame->buffer(webrtc::kUPlane),
-                       next_frame->stride(webrtc::kUPlane),
-                       next_frame->buffer(webrtc::kVPlane),
-                       next_frame->stride(webrtc::kVPlane),
-                       frame->data(media::VideoFrame::kYPlane),
-                       frame->stride(media::VideoFrame::kYPlane),
-                       frame->data(media::VideoFrame::kUPlane),
-                       frame->stride(media::VideoFrame::kUPlane),
-                       frame->data(media::VideoFrame::kVPlane),
-                       frame->stride(media::VideoFrame::kVPlane),
-                       next_frame->width(),
-                       next_frame->height())) {
-    DLOG(ERROR) << "Failed to copy buffer";
-    NOTIFY_ERROR(media::VideoEncodeAccelerator::kPlatformFailureError);
-    return;
+  scoped_refptr<media::VideoFrame> frame;
+  if (next_frame->native_handle()) {
+    frame = static_cast<media::VideoFrame*>(next_frame->native_handle());
+  } else {
+    base::SharedMemory* input_buffer = input_buffers_[index];
+    frame = media::VideoFrame::WrapExternalSharedMemory(
+        media::VideoFrame::I420,
+        input_frame_coded_size_,
+        gfx::Rect(input_visible_size_),
+        input_visible_size_,
+        reinterpret_cast<uint8*>(input_buffer->memory()),
+        input_buffer->mapped_size(),
+        input_buffer->handle(),
+        0,
+        base::TimeDelta());
+    if (!frame.get()) {
+      DLOG(ERROR) << "Impl::EncodeOneFrame(): failed to create frame";
+      NOTIFY_ERROR(media::VideoEncodeAccelerator::kPlatformFailureError);
+      return;
+    }
+    // Do a strided copy of the input frame to match the input requirements for
+    // the encoder.
+    // TODO(sheu): support zero-copy from WebRTC.  http://crbug.com/269312
+    if (libyuv::I420Copy(next_frame->buffer(webrtc::kYPlane),
+                         next_frame->stride(webrtc::kYPlane),
+                         next_frame->buffer(webrtc::kUPlane),
+                         next_frame->stride(webrtc::kUPlane),
+                         next_frame->buffer(webrtc::kVPlane),
+                         next_frame->stride(webrtc::kVPlane),
+                         frame->data(media::VideoFrame::kYPlane),
+                         frame->stride(media::VideoFrame::kYPlane),
+                         frame->data(media::VideoFrame::kUPlane),
+                         frame->stride(media::VideoFrame::kUPlane),
+                         frame->data(media::VideoFrame::kVPlane),
+                         frame->stride(media::VideoFrame::kVPlane),
+                         next_frame->width(), next_frame->height())) {
+      DLOG(ERROR) << "Failed to copy buffer";
+      NOTIFY_ERROR(media::VideoEncodeAccelerator::kPlatformFailureError);
+      return;
+    }
   }
-
+  frame->AddDestructionObserver(media::BindToCurrentLoop(
+      base::Bind(&RTCVideoEncoder::Impl::EncodeFrameFinished, this, index)));
   video_encoder_->Encode(frame, next_frame_keyframe);
   input_buffers_free_.pop_back();
   SignalAsyncWaiter(WEBRTC_VIDEO_CODEC_OK);
@@ -601,8 +604,8 @@ int32_t RTCVideoEncoder::InitEncode(const webrtc::VideoCodec* codec_settings,
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(!impl_.get());
 
-  media::VideoCodecProfile profile = WebRTCVideoCodecToVideoCodecProfile(
-      video_codec_type_, codec_settings);
+  const media::VideoCodecProfile profile =
+      WebRTCVideoCodecToVideoCodecProfile(video_codec_type_, codec_settings);
 
   weak_factory_.InvalidateWeakPtrs();
   impl_ = new Impl(weak_factory_.GetWeakPtr(), gpu_factories_);
@@ -634,7 +637,7 @@ int32_t RTCVideoEncoder::Encode(
     return impl_status_;
   }
 
-  bool want_key_frame = frame_types && frame_types->size() &&
+  const bool want_key_frame = frame_types && frame_types->size() &&
                         frame_types->front() == webrtc::kKeyFrame;
   base::WaitableEvent encode_waiter(true, false);
   int32_t encode_retval = WEBRTC_VIDEO_CODEC_UNINITIALIZED;