src/chrome/browser/media/encrypted_media_message_filter_android.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/media/encrypted_media_message_filter_android.h"
   6
   7 #include <string>
   8
   9 #include "chrome/common/encrypted_media_messages_android.h"
  10 #include "ipc/ipc_message_macros.h"
  11 #include "media/base/android/media_codec_bridge.h"
  12 #include "media/base/android/media_drm_bridge.h"
  13
  14 using content::BrowserThread;
  15 using media::MediaCodecBridge;
  16 using media::MediaDrmBridge;
  17
  18 namespace chrome {
  19
  20 const size_t kMaxKeySystemLength = 256;
  21
  22 // Check whether the available codecs are supported.
  23 static android::SupportedCodecs GetSupportedCodecs(
  24     android::SupportedCodecs requested_codecs,
  25     bool video_must_be_compositable) {
  26   android::SupportedCodecs supported_codecs = android::NO_SUPPORTED_CODECS;
  27   // TODO(qinmin): Remove this DCHECK and query VP8/Vorbis capabilities
  28   // once webm support is added to Android.
  29   DCHECK(!(requested_codecs & android::WEBM_VP8_AND_VORBIS));
  30
  31 #if defined(USE_PROPRIETARY_CODECS)
  32   if ((requested_codecs & android::MP4_AAC) &&
  33       MediaCodecBridge::CanDecode("mp4a", false)) {
  34     supported_codecs = static_cast<android::SupportedCodecs>(
  35         supported_codecs | android::MP4_AAC);
  36   }
  37
  38   // TODO(qinmin): Remove the composition logic when secure contents can be
  39   // composited.
  40   if ((requested_codecs & android::MP4_AVC1) &&
  41       MediaCodecBridge::CanDecode("avc1", !video_must_be_compositable)) {
  42     supported_codecs = static_cast<android::SupportedCodecs>(
  43         supported_codecs | android::MP4_AVC1);
  44   }
  45 #endif  // defined(USE_PROPRIETARY_CODECS)
  46
  47   return supported_codecs;
  48 }
  49
  50 EncryptedMediaMessageFilterAndroid::EncryptedMediaMessageFilterAndroid()
  51     : BrowserMessageFilter(EncryptedMediaMsgStart) {}
  52
  53 EncryptedMediaMessageFilterAndroid::~EncryptedMediaMessageFilterAndroid() {}
  54
  55 bool EncryptedMediaMessageFilterAndroid::OnMessageReceived(
  56     const IPC::Message& message, bool* message_was_ok) {
  57   bool handled = true;
  58   IPC_BEGIN_MESSAGE_MAP_EX(
  59       EncryptedMediaMessageFilterAndroid, message, *message_was_ok)
  60     IPC_MESSAGE_HANDLER(ChromeViewHostMsg_GetSupportedKeySystems,
  61                         OnGetSupportedKeySystems)
  62     IPC_MESSAGE_UNHANDLED(handled = false)
  63   IPC_END_MESSAGE_MAP_EX()
  64   return handled;
  65 }
  66
  67 void EncryptedMediaMessageFilterAndroid::OverrideThreadForMessage(
  68     const IPC::Message& message, BrowserThread::ID* thread) {
  69   // Move the IPC handling to FILE thread as it is not very cheap.
  70   if (message.type() == ChromeViewHostMsg_GetSupportedKeySystems::ID)
  71     *thread = BrowserThread::FILE;
  72 }
  73
  74 void EncryptedMediaMessageFilterAndroid::OnGetSupportedKeySystems(
  75     const SupportedKeySystemRequest& request,
  76     SupportedKeySystemResponse* response) {
  77   if (!response) {
  78     NOTREACHED() << "NULL response pointer provided.";
  79     return;
  80   }
  81
  82   if (request.key_system.size() > kMaxKeySystemLength) {
  83     NOTREACHED() << "Invalid key system: " << request.key_system;
  84     return;
  85   }
  86
  87   // TODO(qinmin): Convert codecs to container types and check whether they
  88   // are supported with the key system.
  89   if (!MediaDrmBridge::IsKeySystemSupportedWithType(request.key_system, ""))
  90     return;
  91
  92   DCHECK_EQ(request.codecs >> 3, 0) << "unrecognized codec";
  93   response->key_system = request.key_system;
  94   // TODO(qinmin): check composition is supported or not.
  95   response->compositing_codecs = GetSupportedCodecs(request.codecs, true);
  96   response->non_compositing_codecs = GetSupportedCodecs(request.codecs, false);
  97 }
  98
  99 }  // namespace chrome