media: VideoFrame: add offset for shared memory buffers

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 266 matching lines @@
 
 // static
 scoped_refptr<VideoFrame> VideoFrame::WrapExternalPackedMemory(
     Format format,
     const gfx::Size& coded_size,
     const gfx::Rect& visible_rect,
     const gfx::Size& natural_size,
     uint8* data,
     size_t data_size,
     base::SharedMemoryHandle handle,
+    size_t data_offset,
     base::TimeDelta timestamp,
     const base::Closure& no_longer_needed_cb) {
   const gfx::Size new_coded_size = AdjustCodedSize(format, coded_size);
 
   if (!IsValidConfig(format, new_coded_size, visible_rect, natural_size))
     return NULL;
   if (data_size < AllocationSize(format, new_coded_size))
     return NULL;
 
   switch (format) {
     case VideoFrame::I420: {
       scoped_refptr<VideoFrame> frame(
           new VideoFrame(format,
                          new_coded_size,
                          visible_rect,
                          natural_size,
                          scoped_ptr<gpu::MailboxHolder>(),
                          timestamp,
                          false));
       frame->shared_memory_handle_ = handle;
+      frame->shared_memory_offset_ = data_offset;
       frame->strides_[kYPlane] = new_coded_size.width();
       frame->strides_[kUPlane] = new_coded_size.width() / 2;
       frame->strides_[kVPlane] = new_coded_size.width() / 2;
       frame->data_[kYPlane] = data;
       frame->data_[kUPlane] = data + new_coded_size.GetArea();
       frame->data_[kVPlane] = data + (new_coded_size.GetArea() * 5 / 4);
       frame->no_longer_needed_cb_ = no_longer_needed_cb;
       return frame;
     }
     default:
@@ skipping 359 matching lines @@
                        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),
       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) {
   DCHECK(IsValidConfig(format_, coded_size_, visible_rect_, natural_size_));
 
   memset(&strides_, 0, sizeof(strides_));
   memset(&data_, 0, sizeof(data_));
 }
 
 VideoFrame::~VideoFrame() {
@@ skipping 85 matching lines @@
 
 const gpu::MailboxHolder* VideoFrame::mailbox_holder() const {
   DCHECK_EQ(format_, NATIVE_TEXTURE);
   return mailbox_holder_.get();
 }
 
 base::SharedMemoryHandle VideoFrame::shared_memory_handle() const {
   return shared_memory_handle_;
 }
 
+size_t VideoFrame::shared_memory_offset() const {
+  return shared_memory_offset_;
+}
+
 void VideoFrame::UpdateReleaseSyncPoint(SyncPointClient* client) {
   DCHECK_EQ(format_, NATIVE_TEXTURE);
   base::AutoLock locker(release_sync_point_lock_);
   // Must wait on the previous sync point before inserting a new sync point so
   // that |mailbox_holder_release_cb_| guarantees the previous sync point
   // occurred when it waits on |release_sync_point_|.
   if (release_sync_point_)
     client->WaitSyncPoint(release_sync_point_);
   release_sync_point_ = client->InsertSyncPoint();
 }
@@ skipping 14 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