MediaStreamRemoteVideoSource: Wrap cricket::VideoFrame instead of copying.

media/base/video_frame.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/base/video_frame.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
@@ skipping 326 matching lines @@
   frame->strides_[kYPlane] = y_stride;
   frame->strides_[kUPlane] = u_stride;
   frame->strides_[kVPlane] = v_stride;
   frame->data_[kYPlane] = y_data;
   frame->data_[kUPlane] = u_data;
   frame->data_[kVPlane] = v_data;
   frame->no_longer_needed_cb_ = no_longer_needed_cb;
   return frame;
 }
 
+// static
+scoped_refptr<VideoFrame> VideoFrame::WrapExternalYuvConstData(
+    Format format,
+    const gfx::Size& coded_size,
+    const gfx::Rect& visible_rect,
+    const gfx::Size& natural_size,
+    int32 y_stride,
+    int32 u_stride,
+    int32 v_stride,
+    const uint8* y_data,
+    const uint8* u_data,
+    const uint8* v_data,
+    base::TimeDelta timestamp,
+    const base::Closure& no_longer_needed_cb) {
+  // Const cast is ok because the pointers will be protected by |is_read_only_|.
+  scoped_refptr<VideoFrame> frame = WrapExternalYuvData(
+      format, coded_size, visible_rect, natural_size, y_stride, u_stride,
+      v_stride, const_cast<uint8*>(y_data), const_cast<uint8*>(u_data),
+      const_cast<uint8*>(v_data), timestamp, no_longer_needed_cb);
+  frame->is_read_only_ = true;
+  return frame;
+}
+
 #if defined(OS_POSIX)
 // static
 scoped_refptr<VideoFrame> VideoFrame::WrapExternalDmabufs(
     Format format,
     const gfx::Size& coded_size,
     const gfx::Rect& visible_rect,
     const gfx::Size& natural_size,
     const std::vector<int> dmabuf_fds,
     base::TimeDelta timestamp,
     const base::Closure& no_longer_needed_cb) {
@@ skipping 307 matching lines @@
                        const gfx::Size& coded_size,
                        const gfx::Rect& visible_rect,
                        const gfx::Size& natural_size,
                        scoped_ptr<gpu::MailboxHolder> mailbox_holder,
                        base::TimeDelta timestamp,
                        bool end_of_stream)
     : format_(format),
       coded_size_(coded_size),
       visible_rect_(visible_rect),
       natural_size_(natural_size),
+      is_read_only_(false),
       mailbox_holder_(mailbox_holder.Pass()),
       shared_memory_handle_(base::SharedMemory::NULLHandle()),
       shared_memory_offset_(0),
       timestamp_(timestamp),
       release_sync_point_(0),
       end_of_stream_(end_of_stream),
       allow_overlay_(false) {
   DCHECK(IsValidConfig(format_, coded_size_, visible_rect_, natural_size_));
 
   memset(&strides_, 0, sizeof(strides_));
@@ skipping 55 matching lines @@
   return Rows(plane, format_, coded_size_.height());
 }
 
 const uint8* VideoFrame::data(size_t plane) const {
   DCHECK(IsValidPlane(plane, format_));
   return data_[plane];
 }
 
 uint8* VideoFrame::data(size_t plane) {
   DCHECK(IsValidPlane(plane, format_));
+  DCHECK(!is_read_only_);
   return data_[plane];
 }
 
 const uint8* VideoFrame::visible_data(size_t plane) const {
   DCHECK(IsValidPlane(plane, format_));
 
   // Calculate an offset that is properly aligned for all planes.
   const gfx::Size alignment = CommonAlignment(format_);
   const gfx::Point offset(RoundDown(visible_rect_.x(), alignment.width()),
                           RoundDown(visible_rect_.y(), alignment.height()));
 
   const gfx::Size subsample = SampleSize(format_, plane);
   DCHECK(offset.x() % subsample.width() == 0);
   DCHECK(offset.y() % subsample.height() == 0);
   return data(plane) +
          stride(plane) * (offset.y() / subsample.height()) +  // Row offset.
          BytesPerElement(format_, plane) *                    // Column offset.
              (offset.x() / subsample.width());
 }
 
 uint8* VideoFrame::visible_data(size_t plane) {
+  DCHECK(!is_read_only_);
   return const_cast<uint8*>(
       static_cast<const VideoFrame*>(this)->visible_data(plane));
 }
 
 const gpu::MailboxHolder* VideoFrame::mailbox_holder() const {
   DCHECK_EQ(format_, NATIVE_TEXTURE);
   return mailbox_holder_.get();
 }
 
 base::SharedMemoryHandle VideoFrame::shared_memory_handle() const {
@@ skipping 31 matching lines @@
   for (size_t plane = 0; plane < NumPlanes(format_); ++plane) {
     for (int row = 0; row < rows(plane); ++row) {
       base::MD5Update(context, base::StringPiece(
           reinterpret_cast<char*>(data(plane) + stride(plane) * row),
           row_bytes(plane)));
     }
   }
 }
 
 }  // namespace media