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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/cdm/renderer/playready_key_system_info.h"
#include "base/logging.h"
#include "base/trace_event/trace_event.h"
#include "components/cdm/common/buildflags.h"
#include "components/cdm/common/playready_cdm_common.h"
#if !BUILDFLAG(ENABLE_PLAYREADY)
#error This file should only be built when PlayReady is enabled.
#endif
using media::EmeConfig;
using media::EmeConfigRuleState;
using media::EmeFeatureSupport;
using media::EmeInitDataType;
using media::EmeMediaType;
using media::SupportedCodecs;
namespace cdm {
PlayReadyKeySystemInfo::PlayReadyKeySystemInfo(
media::SupportedCodecs hw_secure_codecs,
base::flat_set<media::EncryptionScheme> hw_secure_encryption_schemes)
: hw_secure_codecs_(hw_secure_codecs),
hw_secure_encryption_schemes_(std::move(hw_secure_encryption_schemes)) {}
PlayReadyKeySystemInfo::~PlayReadyKeySystemInfo() = default;
std::string PlayReadyKeySystemInfo::GetBaseKeySystemName() const {
return kPlayReadyKeySystemRecommendationDefault;
}
bool PlayReadyKeySystemInfo::IsSupportedKeySystem(
const std::string& key_system) const {
return IsPlayReadyKeySystem(key_system);
}
bool PlayReadyKeySystemInfo::ShouldUseBaseKeySystemName() const {
return true;
}
bool PlayReadyKeySystemInfo::IsSupportedInitDataType(
EmeInitDataType init_data_type) const {
// Here we assume that support for a container imples support for the
// associated initialization data type. KeySystems handles validating
// |init_data_type| x |container| pairings.
// To make KeySystemConfigSelector::GetSupportedConfiguration work correctly,
// use the hardware secure codecs since there are no supported software codecs
// in Chromium. If software secure codecs (aka. codecs_) is used here when
// the keysystem is "com.microsoft.playready.recommendation", then this will
// always return false which is not correct when robustness=3000.
const media::SupportedCodecs codecs = hw_secure_codecs_;
if (init_data_type == EmeInitDataType::WEBM) {
return (codecs & media::EME_CODEC_WEBM_ALL) != 0;
}
if (init_data_type == EmeInitDataType::CENC) {
return (codecs & media::EME_CODEC_MP4_ALL) != 0;
}
if (init_data_type == EmeInitDataType::KEYIDS) {
return true;
}
return false;
}
EmeConfig::Rule PlayReadyKeySystemInfo::GetEncryptionSchemeConfigRule(
media::EncryptionScheme encryption_scheme) const {
if (hw_secure_encryption_schemes_.count(encryption_scheme)) {
return EmeConfig{.hw_secure_codecs = EmeConfigRuleState::kRequired};
}
return EmeConfig::UnsupportedRule();
}
SupportedCodecs PlayReadyKeySystemInfo::GetSupportedCodecs() const {
return media::EME_CODEC_NONE;
}
SupportedCodecs PlayReadyKeySystemInfo::GetSupportedHwSecureCodecs() const {
return hw_secure_codecs_;
}
// `hw_secure_requirement` is not used here because the
// implementation only supports hardware secure PlayReady
// key systems. Software secure is not supported.
EmeConfig::Rule PlayReadyKeySystemInfo::GetRobustnessConfigRule(
const std::string& key_system,
EmeMediaType media_type,
const std::string& requested_robustness,
const bool* hw_secure_requirement) const {
if (IsPlayReadyHwSecureKeySystem(key_system) &&
(requested_robustness.empty() || requested_robustness == "3000")) {
return EmeConfig{.hw_secure_codecs = EmeConfigRuleState::kRequired};
}
// Passing the robustness value of "3000" with the recommendation
// key system also implies hardware secure PlayReady.
if (key_system == kPlayReadyKeySystemRecommendationDefault &&
requested_robustness == "3000") {
return EmeConfig{.hw_secure_codecs = EmeConfigRuleState::kRequired};
}
// Software secure PlayReady is not supported in Chromium.
return EmeConfig::UnsupportedRule();
}
EmeConfig::Rule PlayReadyKeySystemInfo::GetPersistentLicenseSessionSupport()
const {
return EmeConfig::UnsupportedRule();
}
EmeFeatureSupport PlayReadyKeySystemInfo::GetPersistentStateSupport() const {
return EmeFeatureSupport::ALWAYS_ENABLED;
}
EmeFeatureSupport PlayReadyKeySystemInfo::GetDistinctiveIdentifierSupport()
const {
return EmeFeatureSupport::ALWAYS_ENABLED;
}
} // namespace cdm
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