Audio/video data streaming over shared memory.

chromecast/media/cma/ipc_streamer/video_decoder_config_marshaller.cc

+// Copyright 2014 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 "chromecast/media/cma/ipc_streamer/video_decoder_config_marshaller.h"
+
+#include "base/basictypes.h"
+#include "base/logging.h"
+#include "chromecast/media/cma/ipc/media_message.h"
+#include "media/base/video_decoder_config.h"
+#include "ui/gfx/rect.h"
+#include "ui/gfx/size.h"
+
+namespace chromecast {
+namespace media {
+
+namespace {
+const size_t kMaxExtraDataSize = 16 * 1024;
+
+class SizeMarshaller {
+ public:
+  static void Write(const gfx::Size& size, MediaMessage* msg) {
+    CHECK(msg->WritePod(size.width()));
+    CHECK(msg->WritePod(size.height()));
+  }
+
+  static gfx::Size Read(MediaMessage* msg) {
+    int w, h;
+    CHECK(msg->ReadPod(&w));
+    CHECK(msg->ReadPod(&h));
+    return gfx::Size(w, h);
+  }
+};
+
+class RectMarshaller {
+ public:
+  static void Write(const gfx::Rect& rect, MediaMessage* msg) {
+    CHECK(msg->WritePod(rect.x()));
+    CHECK(msg->WritePod(rect.y()));
+    CHECK(msg->WritePod(rect.width()));
+    CHECK(msg->WritePod(rect.height()));
+  }
+
+  static gfx::Rect Read(MediaMessage* msg) {
+    int x, y, w, h;
+    CHECK(msg->ReadPod(&x));
+    CHECK(msg->ReadPod(&y));
+    CHECK(msg->ReadPod(&w));
+    CHECK(msg->ReadPod(&h));
+    return gfx::Rect(x, y, w, h);
+  }
+};
+
+}  // namespace
+
+// static
+void VideoDecoderConfigMarshaller::Write(
+    const ::media::VideoDecoderConfig& config, MediaMessage* msg) {
+  CHECK(msg->WritePod(config.codec()));
+  CHECK(msg->WritePod(config.profile()));
+  CHECK(msg->WritePod(config.format()));
+  SizeMarshaller::Write(config.coded_size(), msg);
+  RectMarshaller::Write(config.visible_rect(), msg);
+  SizeMarshaller::Write(config.natural_size(), msg);
+  CHECK(msg->WritePod(config.is_encrypted()));
+  CHECK(msg->WritePod(config.extra_data_size()));
+  if (config.extra_data_size() > 0)
+    CHECK(msg->WriteBuffer(config.extra_data(), config.extra_data_size()));
+}
+
+// static
+::media::VideoDecoderConfig VideoDecoderConfigMarshaller::Read(
+    MediaMessage* msg) {
+  ::media::VideoCodec codec;
+  ::media::VideoCodecProfile profile;
+  ::media::VideoFrame::Format format;
+  gfx::Size coded_size;
+  gfx::Rect visible_rect;
+  gfx::Size natural_size;
+  bool is_encrypted;
+  size_t extra_data_size;
+  scoped_ptr<uint8[]> extra_data;
+
+  CHECK(msg->ReadPod(&codec));
+  CHECK(msg->ReadPod(&profile));
+  CHECK(msg->ReadPod(&format));
+  coded_size = SizeMarshaller::Read(msg);
+  visible_rect = RectMarshaller::Read(msg);
+  natural_size = SizeMarshaller::Read(msg);
+  CHECK(msg->ReadPod(&is_encrypted));
+  CHECK(msg->ReadPod(&extra_data_size));
+
+  CHECK_GE(codec, ::media::kUnknownVideoCodec);
+  CHECK_LE(codec, ::media::kVideoCodecMax);
+  CHECK_GE(profile, ::media::VIDEO_CODEC_PROFILE_UNKNOWN);
+  CHECK_LE(profile, ::media::VIDEO_CODEC_PROFILE_MAX);
+  CHECK_GE(format, ::media::VideoFrame::UNKNOWN);
+  CHECK_LE(format, ::media::VideoFrame::FORMAT_MAX);
+  CHECK_LT(extra_data_size, kMaxExtraDataSize);
+  if (extra_data_size > 0) {
+    extra_data.reset(new uint8[extra_data_size]);
+    CHECK(msg->ReadBuffer(extra_data.get(), extra_data_size));
+  }
+
+  return ::media::VideoDecoderConfig(
+      codec, profile, format,
+      coded_size, visible_rect, natural_size,
+      extra_data.get(), extra_data_size,
+      is_encrypted);
+}
+
+}  // namespace media
+}  // namespace chromecast