Audio/video data streaming over shared memory.

chromecast/media/cma/ipc_streamer/decrypt_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/decrypt_config_marshaller.h"
+
+#include "base/logging.h"
+#include "chromecast/media/cma/ipc/media_message.h"
+#include "media/base/decrypt_config.h"
+
+namespace chromecast {
+namespace media {
+
+namespace {
+const size_t kMaxKeyIdSize = 256;
+const size_t kMaxIvSize = 256;
+const size_t kMaxSubsampleCount = 1024;
+}
+
+// static
+void DecryptConfigMarshaller::Write(
+    const ::media::DecryptConfig& config, MediaMessage* msg) {
+  CHECK_GT(config.key_id().size(), 0);
+  CHECK_GT(config.iv().size(), 0);
+  CHECK_GT(config.subsamples().size(), 0);
+
+  CHECK(msg->WritePod(config.key_id().size()));
+  CHECK(msg->WriteBuffer(config.key_id().data(), config.key_id().size()));
+  CHECK(msg->WritePod(config.iv().size()));
+  CHECK(msg->WriteBuffer(config.iv().data(), config.iv().size()));
+  CHECK(msg->WritePod(config.subsamples().size()));
+  for (size_t k = 0; k < config.subsamples().size(); k++) {
+    CHECK(msg->WritePod(config.subsamples()[k].clear_bytes));
+    CHECK(msg->WritePod(config.subsamples()[k].cypher_bytes));
+  }
+}
+
+// static
+scoped_ptr< ::media::DecryptConfig> DecryptConfigMarshaller::Read(
+    MediaMessage* msg) {
+  size_t key_id_size = 0;
+  CHECK(msg->ReadPod(&key_id_size));
+  CHECK_GT(key_id_size, 0);
+  CHECK_LT(key_id_size, kMaxKeyIdSize);
+  scoped_ptr<char[]> key_id(new char[key_id_size]);
+  CHECK(msg->ReadBuffer(key_id.get(), key_id_size));
+
+  size_t iv_size = 0;
+  CHECK(msg->ReadPod(&iv_size));
+  CHECK_GT(iv_size, 0);
+  CHECK_LT(iv_size, kMaxIvSize);
+  scoped_ptr<char[]> iv(new char[iv_size]);
+  CHECK(msg->ReadBuffer(iv.get(), iv_size));
+
+  size_t subsample_count = 0;
+  CHECK(msg->ReadPod(&subsample_count));
+  CHECK_GT(subsample_count, 0);
+  CHECK_LT(subsample_count, kMaxSubsampleCount);
+  std::vector< ::media::SubsampleEntry> subsamples(subsample_count);
+  for (size_t k = 0; k < subsample_count; k++) {
+    subsamples[k].clear_bytes = 0;
+    subsamples[k].cypher_bytes = 0;
+    CHECK(msg->ReadPod(&subsamples[k].clear_bytes));
+    CHECK(msg->ReadPod(&subsamples[k].cypher_bytes));
+  }
+
+  return scoped_ptr< ::media::DecryptConfig>(
+      new ::media::DecryptConfig(
+          std::string(key_id.get(), key_id_size),
+          std::string(iv.get(), iv_size),
+          subsamples));
+}
+
+}  // namespace media
+}  // namespace chromecast