media/vpx: Add support for VP9 alpha channel

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 <climits>
 
 #include "base/bind.h"
@@ skipping 357 matching lines @@
   frame->strides_[kVPlane] = v_stride;
   frame->data_[kYPlane] = y_data;
   frame->data_[kUPlane] = u_data;
   frame->data_[kVPlane] = v_data;
   frame->gpu_memory_buffer_handles_.push_back(y_handle);
   frame->gpu_memory_buffer_handles_.push_back(u_handle);
   frame->gpu_memory_buffer_handles_.push_back(v_handle);
   return frame;
 }
 
+// static
+scoped_refptr<VideoFrame> VideoFrame::WrapExternalYuvaData(
+    VideoPixelFormat format,
+    const gfx::Size& coded_size,
+    const gfx::Rect& visible_rect,
+    const gfx::Size& natural_size,
+    int32_t y_stride,
+    int32_t u_stride,
+    int32_t v_stride,
+    int32_t a_stride,
+    uint8_t* y_data,
+    uint8_t* u_data,
+    uint8_t* v_data,
+    uint8_t* a_data,
+    base::TimeDelta timestamp) {
+  const StorageType storage = STORAGE_UNOWNED_MEMORY;
+  if (!IsValidConfig(format, storage, coded_size, visible_rect, natural_size)) {
+    DLOG(ERROR) << __FUNCTION__ << " Invalid config."
+                << ConfigToString(format, storage, coded_size, visible_rect,
+                                  natural_size);
+    return nullptr;
+  }
+
+  if (NumPlanes(format) != 4) {
+    DLOG(ERROR) << "Not expecting alpha for the video format.";

[DaleCurtis, 2016/01/13 01:32:28]

Fix message. Expecting YUVA planes, etc.

[vignesh, 2016/01/15 18:07:13]

Done.

+    return nullptr;
+  }
+
+  scoped_refptr<VideoFrame> frame(new VideoFrame(
+      format, storage, coded_size, visible_rect, natural_size, timestamp));
+  frame->strides_[kYPlane] = y_stride;
+  frame->strides_[kUPlane] = u_stride;
+  frame->strides_[kVPlane] = v_stride;
+  frame->strides_[kAPlane] = a_stride;
+  frame->data_[kYPlane] = y_data;
+  frame->data_[kUPlane] = u_data;
+  frame->data_[kVPlane] = v_data;
+  frame->data_[kAPlane] = a_data;
+  return frame;
+}
+
 #if defined(OS_LINUX)
 // static
 scoped_refptr<VideoFrame> VideoFrame::WrapExternalDmabufs(
     VideoPixelFormat 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) {
 #if defined(OS_CHROMEOS)
@@ skipping 627 matching lines @@
   if (zero_initialize_memory)
     memset(data, 0, data_size);
 
   for (size_t plane = 0; plane < NumPlanes(format_); ++plane)
     data_[plane] = data + offset[plane];
 
   AddDestructionObserver(base::Bind(&base::AlignedFree, data));
 }
 
 }  // namespace media