Adds MediaClientAndroid to support embedder/MediaDrmBridge interaction.

chromecast/media/cdm/playready_drm_delegate_android.cc

+// Copyright 2015 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/cdm/playready_drm_delegate_android.h"
+
+#include "chromecast/media/base/key_systems_common.h"
+#include "media/base/bit_reader.h"
+
+namespace chromecast {
+namespace media {
+
+namespace {
+
+static const uint8 kPlayreadyCustomDataUuid[] = {
+  0x2b, 0xf8, 0x66, 0x80, 0xc6, 0xe5, 0x4e, 0x24,
+  0xbe, 0x23, 0x0f, 0x81, 0x5a, 0x60, 0x6e, 0xb2 };
+
+}
+
+// static
+void PlayreadyDrmDelegateAndroid::Install() {
+  ::media::MediaDrmBridge::RegisterDelegate(
+      kChromecastPlayreadyKeySystem, new PlayreadyDrmDelegateAndroid);
+}
+
+PlayreadyDrmDelegateAndroid::PlayreadyDrmDelegateAndroid() {
+}
+
+PlayreadyDrmDelegateAndroid::~PlayreadyDrmDelegateAndroid() {
+}
+
+bool PlayreadyDrmDelegateAndroid::OnCreateSession(
+    const ::media::EmeInitDataType init_data_type,
+    const uint8* init_data,
+    int init_data_length,
+    std::vector<uint8>& init_data_out,
+    std::vector<std::string>& optional_parameters_out) {
+  if (init_data_type == ::media::EmeInitDataType::CENC) {
+    ::media::BitReader reader(init_data, init_data_length);
+    while (true) {
+      uint32 box_size;
+      uint32 box_type;
+      reader.ReadBits(32, &box_size);
+      reader.ReadBits(32, &box_type);
+      int bytes_read = 8;
+
+      if (!memcmp(&box_type, "uuid", 4)) {
+        if (box_size < 8 + sizeof(kPlayreadyCustomDataUuid)) {
+          break;
+        }
+        // Box size includes the bytes already consumed
+        reader.SkipBits((box_size - bytes_read) * 8);
+        continue;
+      }
+
+      // "uuid" was found, look for custom data format as per b/10246367
+      reader.SkipBits(128);
+      bytes_read += 16;
+      if (!memcmp(&init_data[0] + reader.bits_read() / 8,
+                  kPlayreadyCustomDataUuid, 16)) {
+        reader.SkipBits((box_size - bytes_read) * 8);
+        continue;
+      }
+
+      int custom_data_size = box_size - bytes_read;
+      DCHECK(reader.bits_read() % 8 == 0);
+      int total_bytes_read = reader.bits_read() / 8;
+
+      optional_parameters_out.clear();
+      optional_parameters_out.push_back("PRCustomData");
+      optional_parameters_out.push_back(
+          std::string(&init_data[0] + total_bytes_read,
+                      &init_data[0] + total_bytes_read + custom_data_size));
+      LOG(INFO) << "Including " << custom_data_size
+                << " bytes of custom PlayReady data";
+    }
+  }
+  return true;
+}
+
+}  // namespace media
+}  // namespace chromecast