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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/renderer/android_key_systems.h"
#include <string>
#include <vector>
#include "base/command_line.h"
#include "base/logging.h"
#include "components/cdm/renderer/widevine_key_system_properties.h"
#include "content/public/renderer/render_thread.h"
#include "media/base/eme_constants.h"
#include "media/base/media_switches.h"
#include "media/media_buildflags.h"
#include "widevine_cdm_version.h" // In SHARED_INTERMEDIATE_DIR.
using media::EmeConfigRule;
using media::EmeFeatureSupport;
using media::EmeInitDataType;
using media::EmeSessionTypeSupport;
using media::KeySystemProperties;
using media::SupportedCodecs;
using Robustness = cdm::WidevineKeySystemProperties::Robustness;
namespace cdm {
namespace {
// Implementation of KeySystemProperties for platform-supported key systems.
// Assumes that platform key systems support no features but can and will
// make use of persistence and identifiers.
class AndroidPlatformKeySystemProperties : public KeySystemProperties {
public:
AndroidPlatformKeySystemProperties(const std::string& name,
SupportedCodecs supported_codecs)
: name_(name), supported_codecs_(supported_codecs) {}
std::string GetKeySystemName() const override { return name_; }
bool IsSupportedInitDataType(EmeInitDataType init_data_type) const override {
// Here we assume that support for a container implies support for the
// associated initialization data type. KeySystems handles validating
// |init_data_type| x |container| pairings.
switch (init_data_type) {
case EmeInitDataType::WEBM:
return (supported_codecs_ & media::EME_CODEC_WEBM_ALL) != 0;
case EmeInitDataType::CENC:
return (supported_codecs_ & media::EME_CODEC_MP4_ALL) != 0;
case EmeInitDataType::KEYIDS:
case EmeInitDataType::UNKNOWN:
return false;
}
NOTREACHED();
return false;
}
EmeConfigRule GetEncryptionSchemeConfigRule(
media::EncryptionMode encryption_scheme) const override {
return encryption_scheme == media::EncryptionMode::kCenc
? EmeConfigRule::SUPPORTED
: EmeConfigRule::NOT_SUPPORTED;
}
SupportedCodecs GetSupportedCodecs() const override {
return supported_codecs_;
}
EmeConfigRule GetRobustnessConfigRule(
media::EmeMediaType media_type,
const std::string& requested_robustness) const override {
return requested_robustness.empty() ? EmeConfigRule::SUPPORTED
: EmeConfigRule::NOT_SUPPORTED;
}
EmeSessionTypeSupport GetPersistentLicenseSessionSupport() const override {
return EmeSessionTypeSupport::NOT_SUPPORTED;
}
EmeSessionTypeSupport GetPersistentUsageRecordSessionSupport()
const override {
return EmeSessionTypeSupport::NOT_SUPPORTED;
}
EmeFeatureSupport GetPersistentStateSupport() const override {
return EmeFeatureSupport::ALWAYS_ENABLED;
}
EmeFeatureSupport GetDistinctiveIdentifierSupport() const override {
return EmeFeatureSupport::ALWAYS_ENABLED;
}
private:
const std::string name_;
const SupportedCodecs supported_codecs_;
};
} // namespace
SupportedKeySystemResponse QueryKeySystemSupport(
const std::string& key_system) {
SupportedKeySystemRequest request;
SupportedKeySystemResponse response;
request.key_system = key_system;
request.codecs = media::EME_CODEC_ALL;
content::RenderThread::Get()->Send(
new ChromeViewHostMsg_QueryKeySystemSupport(request, &response));
DCHECK(!(response.non_secure_codecs & ~media::EME_CODEC_ALL))
<< "unrecognized codec";
DCHECK(!(response.secure_codecs & ~media::EME_CODEC_ALL))
<< "unrecognized codec";
return response;
}
void AddAndroidWidevine(
std::vector<std::unique_ptr<KeySystemProperties>>* concrete_key_systems) {
auto response = QueryKeySystemSupport(kWidevineKeySystem);
auto codecs = response.non_secure_codecs;
// On Android, ".secure" codecs are all hardware secure codecs.
auto hw_secure_codecs = response.secure_codecs;
// Since we do not control the implementation of the MediaDrm API on Android,
// we assume that it can and will make use of persistence no matter whether
// persistence-based features are supported or not.
const EmeSessionTypeSupport persistent_license_support =
response.is_persistent_license_supported
? EmeSessionTypeSupport::SUPPORTED_WITH_IDENTIFIER
: EmeSessionTypeSupport::NOT_SUPPORTED;
if (codecs != media::EME_CODEC_NONE) {
DVLOG(3) << __func__ << " Widevine supported.";
// TODO(crbug.com/813845): Determine 'cbcs' support, which may vary by
// Android version.
base::flat_set<media::EncryptionMode> encryption_schemes = {
media::EncryptionMode::kCenc};
concrete_key_systems->emplace_back(new WidevineKeySystemProperties(
codecs, // Regular codecs.
encryption_schemes, // Encryption schemes.
hw_secure_codecs, // Hardware secure codecs.
encryption_schemes, // Hardware secure encryption schemes.
Robustness::HW_SECURE_CRYPTO, // Max audio robustness.
Robustness::HW_SECURE_ALL, // Max video robustness.
persistent_license_support, // persistent-license.
EmeSessionTypeSupport::NOT_SUPPORTED, // persistent-release-message.
EmeFeatureSupport::ALWAYS_ENABLED, // Persistent state.
EmeFeatureSupport::ALWAYS_ENABLED)); // Distinctive identifier.
} else {
// It doesn't make sense to support hw secure codecs but not regular codecs.
DVLOG(3) << __func__ << " Widevine NOT supported.";
DCHECK(hw_secure_codecs == media::EME_CODEC_NONE);
}
}
void AddAndroidPlatformKeySystems(
std::vector<std::unique_ptr<KeySystemProperties>>* concrete_key_systems) {
std::vector<std::string> key_system_names;
content::RenderThread::Get()->Send(
new ChromeViewHostMsg_GetPlatformKeySystemNames(&key_system_names));
for (std::vector<std::string>::const_iterator it = key_system_names.begin();
it != key_system_names.end(); ++it) {
SupportedKeySystemResponse response = QueryKeySystemSupport(*it);
if (response.non_secure_codecs != media::EME_CODEC_NONE) {
concrete_key_systems->emplace_back(new AndroidPlatformKeySystemProperties(
*it, response.non_secure_codecs));
}
}
}
} // namespace cdm
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