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// 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 "components/cdm/browser/cdm_message_filter_android.h"
#include <string>
#include "components/cdm/common/cdm_messages_android.h"
#include "ipc/ipc_message_macros.h"
#include "media/base/android/media_codec_bridge.h"
#include "media/base/android/media_drm_bridge.h"
using content::BrowserThread;
using content::SupportedCodecs;
using media::MediaCodecBridge;
using media::MediaDrmBridge;
namespace cdm {
const size_t kMaxKeySystemLength = 256;
enum CodecType {
CODEC_AUDIO,
CODEC_VIDEO
};
struct CodecInfo {
SupportedCodecs codec;
CodecType codec_type;
const char* codec_name;
const char* container_mime_type;
};
const CodecInfo kCodecsToQuery[] = {
{content::EME_CODEC_WEBM_VORBIS, CODEC_AUDIO, "vorbis", "video/webm"},
{content::EME_CODEC_WEBM_VP8, CODEC_VIDEO, "vp8", "video/webm"},
{content::EME_CODEC_WEBM_VP9, CODEC_VIDEO, "vp9", "video/webm"},
#if defined(USE_PROPRIETARY_CODECS)
{content::EME_CODEC_MP4_AAC, CODEC_AUDIO, "mp4a", "video/mp4"},
{content::EME_CODEC_MP4_AVC1, CODEC_VIDEO, "avc1", "video/mp4"}
#endif // defined(USE_PROPRIETARY_CODECS)
};
static SupportedCodecs GetSupportedCodecs(
const SupportedKeySystemRequest& request,
bool video_must_be_compositable) {
const std::string& key_system = request.key_system;
SupportedCodecs supported_codecs = content::EME_CODEC_NONE;
for (size_t i = 0; i < arraysize(kCodecsToQuery); ++i) {
const CodecInfo& info = kCodecsToQuery[i];
// TODO(qinmin): Remove the composition logic when secure contents can be
// composited.
bool is_secure = (info.codec_type == CODEC_VIDEO)
? (!video_must_be_compositable) : false;
if ((request.codecs & info.codec) &&
MediaDrmBridge::IsKeySystemSupportedWithType(
key_system, info.container_mime_type) &&
MediaCodecBridge::CanDecode(info.codec_name, is_secure)) {
supported_codecs |= info.codec;
}
}
return supported_codecs;
}
CdmMessageFilterAndroid::CdmMessageFilterAndroid()
: BrowserMessageFilter(EncryptedMediaMsgStart) {}
CdmMessageFilterAndroid::~CdmMessageFilterAndroid() {}
bool CdmMessageFilterAndroid::OnMessageReceived(
const IPC::Message& message, bool* message_was_ok) {
bool handled = true;
IPC_BEGIN_MESSAGE_MAP_EX(
CdmMessageFilterAndroid, message, *message_was_ok)
IPC_MESSAGE_HANDLER(ChromeViewHostMsg_GetSupportedKeySystems,
OnGetSupportedKeySystems)
IPC_MESSAGE_UNHANDLED(handled = false)
IPC_END_MESSAGE_MAP_EX()
return handled;
}
void CdmMessageFilterAndroid::OverrideThreadForMessage(
const IPC::Message& message, BrowserThread::ID* thread) {
// Move the IPC handling to FILE thread as it is not very cheap.
if (message.type() == ChromeViewHostMsg_GetSupportedKeySystems::ID)
*thread = BrowserThread::FILE;
}
void CdmMessageFilterAndroid::OnGetSupportedKeySystems(
const SupportedKeySystemRequest& request,
SupportedKeySystemResponse* response) {
if (!response) {
NOTREACHED() << "NULL response pointer provided.";
return;
}
if (request.key_system.size() > kMaxKeySystemLength) {
NOTREACHED() << "Invalid key system: " << request.key_system;
return;
}
if (!MediaDrmBridge::IsKeySystemSupported(request.key_system))
return;
DCHECK(request.codecs & content::EME_CODEC_ALL) << "unrecognized codec";
response->key_system = request.key_system;
// TODO(qinmin): check composition is supported or not.
response->compositing_codecs = GetSupportedCodecs(request, true);
response->non_compositing_codecs = GetSupportedCodecs(request, false);
}
} // namespace cdm
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