Motown: Video renderer library code

mojo/services/media/common/cpp/video_converter.h

+// Copyright 2016 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.
+
+#ifndef MOJO_SERVICES_MEDIA_COMMON_CPP_VIDEO_CONVERTER_H_
+#define MOJO_SERVICES_MEDIA_COMMON_CPP_VIDEO_CONVERTER_H_
+
+#include <memory>
+
+#include "mojo/services/media/common/cpp/video_packet_layout.h"
+
+namespace mojo {
+namespace media {
+
+class VideoConverter {
+ public:
+  VideoConverter();
+
+  ~VideoConverter();
+
+  // Sets the media type of the frames to be converted. 8-bit interleaved
+  // RGBA output is assumed.
+  void SetMediaType(const MediaTypePtr& media_type);
+
+  // Converts the frame in the payload into the provided RGBA buffer.
+  void ConvertFrame(uint8_t* rgba_buffer,
+                    uint32_t view_width,
+                    uint32_t view_height,
+                    void* payload,
+                    uint64_t payload_size);
+
+ private:
+  // Builds the YUV-RGBA colorspace table.
+  void BuildColorspaceTable();
+
+  // Converts one line.
+  void ConvertLine(uint32_t* dest_pixel,
+                   uint8_t* y_pixel,
+                   uint8_t* u_pixel,
+                   uint8_t* v_pixel,
+                   uint32_t width);
+
+  bool media_type_set_ = false;
+  VideoPacketLayout layout_;
+  std::unique_ptr<uint32_t[]> colorspace_table_;
+};
+
+}  // namespace media
+}  // namespace moj
+
+#endif  // MOJO_SERVICES_MEDIA_COMMON_CPP_VIDEO_CONVERTER_H_