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// Copyright 2013 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 "chrome/renderer/media/chrome_key_systems.h"
#include <stddef.h>
#include <string>
#include <vector>
#include "base/logging.h"
#include "base/strings/string16.h"
#include "base/strings/string_split.h"
#include "base/strings/utf_string_conversions.h"
#include "build/build_config.h"
#include "chrome/common/render_messages.h"
#include "components/cdm/renderer/widevine_key_systems.h"
#include "content/public/renderer/render_thread.h"
#include "media/base/eme_constants.h"
#if defined(OS_ANDROID)
#include "components/cdm/renderer/android_key_systems.h"
#endif
#include "widevine_cdm_version.h" // In SHARED_INTERMEDIATE_DIR.
// The following must be after widevine_cdm_version.h.
#if defined(WIDEVINE_CDM_AVAILABLE) && defined(WIDEVINE_CDM_MIN_GLIBC_VERSION)
#include <gnu/libc-version.h>
#include "base/version.h"
#endif
using media::KeySystemInfo;
using media::SupportedCodecs;
#if defined(ENABLE_PEPPER_CDMS)
static bool IsPepperCdmAvailable(
const std::string& pepper_type,
std::vector<base::string16>* additional_param_names,
std::vector<base::string16>* additional_param_values) {
bool is_available = false;
content::RenderThread::Get()->Send(
new ChromeViewHostMsg_IsInternalPluginAvailableForMimeType(
pepper_type,
&is_available,
additional_param_names,
additional_param_values));
return is_available;
}
// External Clear Key (used for testing).
static void AddExternalClearKey(
std::vector<KeySystemInfo>* concrete_key_systems) {
static const char kExternalClearKeyKeySystem[] =
"org.chromium.externalclearkey";
static const char kExternalClearKeyDecryptOnlyKeySystem[] =
"org.chromium.externalclearkey.decryptonly";
static const char kExternalClearKeyFileIOTestKeySystem[] =
"org.chromium.externalclearkey.fileiotest";
static const char kExternalClearKeyInitializeFailKeySystem[] =
"org.chromium.externalclearkey.initializefail";
static const char kExternalClearKeyCrashKeySystem[] =
"org.chromium.externalclearkey.crash";
static const char kExternalClearKeyPepperType[] =
"application/x-ppapi-clearkey-cdm";
std::vector<base::string16> additional_param_names;
std::vector<base::string16> additional_param_values;
if (!IsPepperCdmAvailable(kExternalClearKeyPepperType,
&additional_param_names,
&additional_param_values)) {
return;
}
KeySystemInfo info;
info.key_system = kExternalClearKeyKeySystem;
info.supported_init_data_types =
media::kInitDataTypeMaskWebM | media::kInitDataTypeMaskKeyIds;
info.supported_codecs = media::EME_CODEC_WEBM_ALL;
#if defined(USE_PROPRIETARY_CODECS)
info.supported_init_data_types |= media::kInitDataTypeMaskCenc;
info.supported_codecs |= media::EME_CODEC_MP4_ALL;
#endif // defined(USE_PROPRIETARY_CODECS)
info.max_audio_robustness = media::EmeRobustness::EMPTY;
info.max_video_robustness = media::EmeRobustness::EMPTY;
// Persistent sessions are faked.
info.persistent_license_support = media::EmeSessionTypeSupport::SUPPORTED;
info.persistent_release_message_support =
media::EmeSessionTypeSupport::NOT_SUPPORTED;
info.persistent_state_support = media::EmeFeatureSupport::REQUESTABLE;
info.distinctive_identifier_support = media::EmeFeatureSupport::NOT_SUPPORTED;
info.pepper_type = kExternalClearKeyPepperType;
concrete_key_systems->push_back(info);
// Add support of decrypt-only mode in ClearKeyCdm.
info.key_system = kExternalClearKeyDecryptOnlyKeySystem;
concrete_key_systems->push_back(info);
// A key system that triggers FileIO test in ClearKeyCdm.
info.key_system = kExternalClearKeyFileIOTestKeySystem;
concrete_key_systems->push_back(info);
// A key system that Chrome thinks is supported by ClearKeyCdm, but actually
// will be refused by ClearKeyCdm. This is to test the CDM initialization
// failure case.
info.key_system = kExternalClearKeyInitializeFailKeySystem;
concrete_key_systems->push_back(info);
// A key system that triggers a crash in ClearKeyCdm.
info.key_system = kExternalClearKeyCrashKeySystem;
concrete_key_systems->push_back(info);
}
#if defined(WIDEVINE_CDM_AVAILABLE)
// This function finds "codecs" and parses the value into the vector |codecs|.
// Converts the codec strings to UTF-8 since we only expect ASCII strings and
// this simplifies the rest of the code in this file.
void GetSupportedCodecsForPepperCdm(
const std::vector<base::string16>& additional_param_names,
const std::vector<base::string16>& additional_param_values,
std::vector<std::string>* codecs) {
DCHECK(codecs->empty());
DCHECK_EQ(additional_param_names.size(), additional_param_values.size());
for (size_t i = 0; i < additional_param_names.size(); ++i) {
if (additional_param_names[i] ==
base::ASCIIToUTF16(kCdmSupportedCodecsParamName)) {
const base::string16& codecs_string16 = additional_param_values[i];
std::string codecs_string;
if (!base::UTF16ToUTF8(codecs_string16.c_str(),
codecs_string16.length(),
&codecs_string)) {
DLOG(WARNING) << "Non-UTF-8 codecs string.";
// Continue using the best effort conversion.
}
*codecs = base::SplitString(
codecs_string, std::string(1, kCdmSupportedCodecsValueDelimiter),
base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
break;
}
}
}
static void AddPepperBasedWidevine(
std::vector<KeySystemInfo>* concrete_key_systems) {
#if defined(WIDEVINE_CDM_MIN_GLIBC_VERSION)
Version glibc_version(gnu_get_libc_version());
DCHECK(glibc_version.IsValid());
if (glibc_version < base::Version(WIDEVINE_CDM_MIN_GLIBC_VERSION))
return;
#endif // defined(WIDEVINE_CDM_MIN_GLIBC_VERSION)
std::vector<base::string16> additional_param_names;
std::vector<base::string16> additional_param_values;
if (!IsPepperCdmAvailable(kWidevineCdmPluginMimeType,
&additional_param_names,
&additional_param_values)) {
DVLOG(1) << "Widevine CDM is not currently available.";
return;
}
std::vector<std::string> codecs;
GetSupportedCodecsForPepperCdm(additional_param_names,
additional_param_values,
&codecs);
SupportedCodecs supported_codecs = media::EME_CODEC_NONE;
// Audio codecs are always supported.
// TODO(sandersd): Distinguish these from those that are directly supported,
// as those may offer a higher level of protection.
supported_codecs |= media::EME_CODEC_WEBM_OPUS;
supported_codecs |= media::EME_CODEC_WEBM_VORBIS;
#if defined(USE_PROPRIETARY_CODECS)
supported_codecs |= media::EME_CODEC_MP4_AAC;
#endif // defined(USE_PROPRIETARY_CODECS)
for (size_t i = 0; i < codecs.size(); ++i) {
if (codecs[i] == kCdmSupportedCodecVp8)
supported_codecs |= media::EME_CODEC_WEBM_VP8;
if (codecs[i] == kCdmSupportedCodecVp9)
supported_codecs |= media::EME_CODEC_WEBM_VP9;
#if defined(USE_PROPRIETARY_CODECS)
if (codecs[i] == kCdmSupportedCodecAvc1)
supported_codecs |= media::EME_CODEC_MP4_AVC1;
#endif // defined(USE_PROPRIETARY_CODECS)
}
cdm::AddWidevineWithCodecs(
supported_codecs,
#if defined(OS_CHROMEOS)
media::EmeRobustness::HW_SECURE_ALL, // Maximum audio robustness.
media::EmeRobustness::HW_SECURE_ALL, // Maximim video robustness.
media::EmeSessionTypeSupport::
SUPPORTED_WITH_IDENTIFIER, // Persistent-license.
media::EmeSessionTypeSupport::
NOT_SUPPORTED, // Persistent-release-message.
media::EmeFeatureSupport::REQUESTABLE, // Persistent state.
media::EmeFeatureSupport::REQUESTABLE, // Distinctive identifier.
#else // (Desktop)
media::EmeRobustness::SW_SECURE_CRYPTO, // Maximum audio robustness.
media::EmeRobustness::SW_SECURE_DECODE, // Maximum video robustness.
media::EmeSessionTypeSupport::NOT_SUPPORTED, // persistent-license.
media::EmeSessionTypeSupport::
NOT_SUPPORTED, // persistent-release-message.
media::EmeFeatureSupport::REQUESTABLE, // Persistent state.
media::EmeFeatureSupport::NOT_SUPPORTED, // Distinctive identifier.
#endif // defined(OS_CHROMEOS)
concrete_key_systems);
}
#endif // defined(WIDEVINE_CDM_AVAILABLE)
#endif // defined(ENABLE_PEPPER_CDMS)
void AddChromeKeySystems(std::vector<KeySystemInfo>* key_systems_info) {
#if defined(ENABLE_PEPPER_CDMS)
AddExternalClearKey(key_systems_info);
#if defined(WIDEVINE_CDM_AVAILABLE)
AddPepperBasedWidevine(key_systems_info);
#endif // defined(WIDEVINE_CDM_AVAILABLE)
#endif // defined(ENABLE_PEPPER_CDMS)
#if defined(OS_ANDROID)
cdm::AddAndroidWidevine(key_systems_info);
#endif // defined(OS_ANDROID)
}
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