Add CDM video decoder.

webkit/media/crypto/ppapi/ffmpeg_cdm_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 "webkit/media/crypto/ppapi/ffmpeg_cdm_video_frame.h"
+
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "media/base/limits.h"
+#include "webkit/media/crypto/ppapi/ffmpeg_cdm_video_decoder.h"
+
+
+namespace webkit_media {
+
+namespace {
+
+inline size_t RoundUp(size_t value, size_t alignment) {
+  // Check that |alignment| is a power of 2.
+  DCHECK((alignment + (alignment - 1)) == (alignment | (alignment - 1)));
+  return ((value + (alignment - 1)) & ~(alignment-1));
+}
+
+int RowBytes(cdm::VideoFormat format,
+             cdm::VideoFrame::VideoPlane plane,
+             int width) {
+  switch (format) {
+    case cdm::kYv12:
+    case cdm::kI420:
+      if (plane == cdm::VideoFrame::kYPlane)
+        return width;
+      return RoundUp(width, 2) / 2;
+
+    default:
+      NOTREACHED() << "Unsupported video frame format: " << format;
+      return 0;
+  }
+}
+
+}  // namespace
+
+// static
+FFmpegCdmVideoFrame* FFmpegCdmVideoFrame::Create(cdm::Allocator* allocator,
+                                                 cdm::VideoFormat format,
+                                                 const cdm::Size& size) {
+  if (!IsValidConfig(format, size)) {
+    LOG(ERROR) << "VideoFrame::Create invalid config.";
+    return NULL;
+  }
+
+  scoped_ptr<FFmpegCdmVideoFrame> frame(new FFmpegCdmVideoFrame(format, size));
+
+  if (!frame->AllocateYUV(allocator))
+    return NULL;
+
+  return frame.release();
+}
+
+FFmpegCdmVideoFrame::FFmpegCdmVideoFrame(cdm::VideoFormat format,
+                                         const cdm::Size& size)
+    : format_(format),
+      size_(size),
+      frame_buffer_(NULL) {
+  for (int32_t i = 0; i < cdm::VideoFrame::kMaxPlanes; ++i) {
+    plane_offsets_[i] = 0;
+    strides_[i] = 0;
+  }
+}
+
+FFmpegCdmVideoFrame::~FFmpegCdmVideoFrame() {
+  if (frame_buffer_)
+    frame_buffer_->Destroy();
+}
+
+const cdm::Size& FFmpegCdmVideoFrame::size() const {
+  return size_;
+}
+
+cdm::VideoFormat FFmpegCdmVideoFrame::format() const {
+  return format_;

[xhwang, 2012/10/16 21:59:53]

accessors can be defined in header files

[Tom Finegan, 2012/10/17 02:39:10]

Done. Moved the single line ones into the header file.

+}
+
+cdm::Buffer* FFmpegCdmVideoFrame::frame_buffer() {
+  return frame_buffer_;
+}
+
+int32_t FFmpegCdmVideoFrame::plane_offset(cdm::VideoFrame::VideoPlane plane) {
+  DCHECK(0 <= plane && plane < cdm::VideoFrame::kMaxPlanes);
+  return plane_offsets_[plane];
+}
+
+int32_t FFmpegCdmVideoFrame::stride(cdm::VideoFrame::VideoPlane plane) {
+  DCHECK(0 <= plane && plane < cdm::VideoFrame::kMaxPlanes);
+  return strides_[plane];
+}
+
+

[xhwang, 2012/10/16 21:59:53]

remove extra empty line

[Tom Finegan, 2012/10/17 02:39:10]

Done.

+cdm::Buffer* FFmpegCdmVideoFrame::ReleaseCdmBuffer() {
+  cdm::Buffer* buffer = frame_buffer_;
+  frame_buffer_ = NULL;
+  return buffer;
+}
+
+bool FFmpegCdmVideoFrame::AllocateYUV(cdm::Allocator* allocator) {

[xhwang, 2012/10/16 21:59:53]

Bikeshedding: Not sure if it should be YUV or Yuv :)

[Tom Finegan, 2012/10/17 02:39:10]

Done. I prefer Yuv anyway. :)

+  DCHECK(allocator);
+  DCHECK(format_ == cdm::kYv12 || format_ == cdm::kI420);
+
+  // Align Y rows at least at 32 byte boundaries for safety on all platforms.
+  DVLOG(1) << "VideoFrame::AllocateYUV: width=" << size_.width

[xhwang, 2012/10/16 21:59:53]

s/VideoFame/FFmpegCdmVideoFrame

[Tom Finegan, 2012/10/17 02:39:10]

Removed class name from the comment. File name and method is enough.

+           << " height=" << size_.height;
+  size_t y_stride = RoundUp(
+      RowBytes(format_, cdm::VideoFrame::kYPlane, size_.width),
+      kBufferAlignment);
+  size_t uv_stride = RoundUp(
+      RowBytes(format_, cdm::VideoFrame::kUPlane, size_.width),
+      kBufferAlignment);
+
+  size_t y_height = RoundUp(size_.height, kBufferAlignment);
+  size_t uv_height = format_ == cdm::kYv12 ? y_height / 2 : y_height;

[xhwang, 2012/10/16 21:59:53]

The difference b/w YV12 and I420 is that YV12 is YVU but I420 is YUV. In case of
I420, the uv_height should still be y_height / 2, right?

[Tom Finegan, 2012/10/17 02:39:10]

Thanks for catching this-- this is based on media::VideoFrame, and its
AllocateYUV() supports YV12 and YV16. Done.

+  size_t y_bytes = y_height * y_stride;
+  size_t uv_bytes = uv_height * uv_stride;
+
+  frame_buffer_ = allocator->Allocate(y_bytes + (uv_bytes * 2));
+  if (!frame_buffer_) {
+    LOG(ERROR) << "cdm::Allocator::Allocate failed.";
+    return false;
+  }
+
+  COMPILE_ASSERT(0 == cdm::VideoFrame::kYPlane, y_plane_data_must_be_index_0);
+  uint8_t* data = frame_buffer_->data();
+  DCHECK_EQ(0U, reinterpret_cast<uintptr_t>(data) & (kBufferAlignment - 1));
+
+  plane_offsets_[cdm::VideoFrame::kYPlane] =  0;
+
+  if (format_ == cdm::kYv12) {
+    plane_offsets_[cdm::VideoFrame::kVPlane] = y_bytes;
+    plane_offsets_[cdm::VideoFrame::kUPlane] = y_bytes + uv_bytes;
+  } else {
+    plane_offsets_[cdm::VideoFrame::kUPlane] = y_bytes;
+    plane_offsets_[cdm::VideoFrame::kVPlane] = y_bytes + uv_bytes;
+  }
+
+  strides_[cdm::VideoFrame::kYPlane] = y_stride;
+  strides_[cdm::VideoFrame::kUPlane] = uv_stride;
+  strides_[cdm::VideoFrame::kVPlane] = uv_stride;
+
+  return true;
+}
+
+}  // namespace webkit_media