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MediaKeySystemAccess.cpp
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/dom/MediaKeySystemAccess.h"
#include "mozilla/dom/MediaKeySystemAccessBinding.h"
#include "mozilla/dom/MediaKeySession.h"
#include "mozilla/Preferences.h"
#include "MediaContainerType.h"
#include "MediaPrefs.h"
#ifdef MOZ_FMP4
#include "MP4Decoder.h"
#endif
#ifdef XP_WIN
#include "WMFDecoderModule.h"
#endif
#include "nsContentCID.h"
#include "nsServiceManagerUtils.h"
#include "mozIGeckoMediaPluginService.h"
#include "VideoUtils.h"
#include "mozilla/Services.h"
#include "nsIObserverService.h"
#include "mozilla/EMEUtils.h"
#include "GMPUtils.h"
#include "nsAppDirectoryServiceDefs.h"
#include "nsDirectoryServiceUtils.h"
#include "nsDirectoryServiceDefs.h"
#include "nsXULAppAPI.h"
#include "DecoderDoctorDiagnostics.h"
#include "WebMDecoder.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/ClearOnShutdown.h"
#include "nsUnicharUtils.h"
#include "mozilla/dom/MediaSource.h"
#ifdef MOZ_WIDGET_ANDROID
#include "FennecJNIWrappers.h"
#endif
#include <functional>
namespace mozilla {
namespace dom {
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(MediaKeySystemAccess,
mParent)
NS_IMPL_CYCLE_COLLECTING_ADDREF(MediaKeySystemAccess)
NS_IMPL_CYCLE_COLLECTING_RELEASE(MediaKeySystemAccess)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(MediaKeySystemAccess)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
static nsCString
ToCString(const MediaKeySystemConfiguration& aConfig);
MediaKeySystemAccess::MediaKeySystemAccess(nsPIDOMWindowInner* aParent,
const nsAString& aKeySystem,
const MediaKeySystemConfiguration& aConfig)
: mParent(aParent)
, mKeySystem(aKeySystem)
, mConfig(aConfig)
{
EME_LOG("Created MediaKeySystemAccess for keysystem=%s config=%s",
NS_ConvertUTF16toUTF8(mKeySystem).get(), mozilla::dom::ToCString(mConfig).get());
}
MediaKeySystemAccess::~MediaKeySystemAccess()
{
}
JSObject*
MediaKeySystemAccess::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
return MediaKeySystemAccessBinding::Wrap(aCx, this, aGivenProto);
}
nsPIDOMWindowInner*
MediaKeySystemAccess::GetParentObject() const
{
return mParent;
}
void
MediaKeySystemAccess::GetKeySystem(nsString& aOutKeySystem) const
{
aOutKeySystem.Assign(mKeySystem);
}
void
MediaKeySystemAccess::GetConfiguration(MediaKeySystemConfiguration& aConfig)
{
aConfig = mConfig;
}
already_AddRefed<Promise>
MediaKeySystemAccess::CreateMediaKeys(ErrorResult& aRv)
{
RefPtr<MediaKeys> keys(new MediaKeys(mParent,
mKeySystem,
mConfig));
return keys->Init(aRv);
}
static bool
HavePluginForKeySystem(const nsCString& aKeySystem)
{
nsCString api = MediaPrefs::EMEChromiumAPIEnabled()
? NS_LITERAL_CSTRING(CHROMIUM_CDM_API)
: NS_LITERAL_CSTRING(GMP_API_DECRYPTOR);
bool havePlugin = HaveGMPFor(api, { aKeySystem });
#ifdef MOZ_WIDGET_ANDROID
// Check if we can use MediaDrm for this keysystem.
if (!havePlugin) {
havePlugin = mozilla::java::MediaDrmProxy::IsSchemeSupported(aKeySystem);
}
#endif
return havePlugin;
}
static MediaKeySystemStatus
EnsureCDMInstalled(const nsAString& aKeySystem,
nsACString& aOutMessage)
{
if (!HavePluginForKeySystem(NS_ConvertUTF16toUTF8(aKeySystem))) {
aOutMessage = NS_LITERAL_CSTRING("CDM is not installed");
return MediaKeySystemStatus::Cdm_not_installed;
}
return MediaKeySystemStatus::Available;
}
/* static */
MediaKeySystemStatus
MediaKeySystemAccess::GetKeySystemStatus(const nsAString& aKeySystem,
nsACString& aOutMessage)
{
MOZ_ASSERT(MediaPrefs::EMEEnabled() || IsClearkeyKeySystem(aKeySystem));
if (IsClearkeyKeySystem(aKeySystem)) {
return EnsureCDMInstalled(aKeySystem, aOutMessage);
}
if (IsWidevineKeySystem(aKeySystem)) {
if (Preferences::GetBool("media.gmp-widevinecdm.visible", false)) {
if (!Preferences::GetBool("media.gmp-widevinecdm.enabled", false)) {
aOutMessage = NS_LITERAL_CSTRING("Widevine EME disabled");
return MediaKeySystemStatus::Cdm_disabled;
}
return EnsureCDMInstalled(aKeySystem, aOutMessage);
#ifdef MOZ_WIDGET_ANDROID
} else if (Preferences::GetBool("media.mediadrm-widevinecdm.visible", false)) {
nsCString keySystem = NS_ConvertUTF16toUTF8(aKeySystem);
bool supported = mozilla::java::MediaDrmProxy::IsSchemeSupported(keySystem);
if (!supported) {
aOutMessage = NS_LITERAL_CSTRING("KeySystem or Minimum API level not met for Widevine EME");
return MediaKeySystemStatus::Cdm_not_supported;
}
return MediaKeySystemStatus::Available;
#endif
}
}
return MediaKeySystemStatus::Cdm_not_supported;
}
typedef nsCString EMECodecString;
static NS_NAMED_LITERAL_CSTRING(EME_CODEC_AAC, "aac");
static NS_NAMED_LITERAL_CSTRING(EME_CODEC_OPUS, "opus");
static NS_NAMED_LITERAL_CSTRING(EME_CODEC_VORBIS, "vorbis");
static NS_NAMED_LITERAL_CSTRING(EME_CODEC_H264, "h264");
static NS_NAMED_LITERAL_CSTRING(EME_CODEC_VP8, "vp8");
static NS_NAMED_LITERAL_CSTRING(EME_CODEC_VP9, "vp9");
EMECodecString
ToEMEAPICodecString(const nsString& aCodec)
{
if (IsAACCodecString(aCodec)) {
return EME_CODEC_AAC;
}
if (aCodec.EqualsLiteral("opus")) {
return EME_CODEC_OPUS;
}
if (aCodec.EqualsLiteral("vorbis")) {
return EME_CODEC_VORBIS;
}
if (IsH264CodecString(aCodec)) {
return EME_CODEC_H264;
}
if (IsVP8CodecString(aCodec)) {
return EME_CODEC_VP8;
}
if (IsVP9CodecString(aCodec)) {
return EME_CODEC_VP9;
}
return EmptyCString();
}
// A codec can be decrypted-and-decoded by the CDM, or only decrypted
// by the CDM and decoded by Gecko. Not both.
struct KeySystemContainerSupport
{
bool IsSupported() const
{
return !mCodecsDecoded.IsEmpty() || !mCodecsDecrypted.IsEmpty();
}
// CDM decrypts and decodes using a DRM robust decoder, and passes decoded
// samples back to Gecko for rendering.
bool DecryptsAndDecodes(EMECodecString aCodec) const
{
return mCodecsDecoded.Contains(aCodec);
}
// CDM decrypts and passes the decrypted samples back to Gecko for decoding.
bool Decrypts(EMECodecString aCodec) const
{
return mCodecsDecrypted.Contains(aCodec);
}
void SetCanDecryptAndDecode(EMECodecString aCodec)
{
// Can't both decrypt and decrypt-and-decode a codec.
MOZ_ASSERT(!Decrypts(aCodec));
// Prevent duplicates.
MOZ_ASSERT(!DecryptsAndDecodes(aCodec));
mCodecsDecoded.AppendElement(aCodec);
}
void SetCanDecrypt(EMECodecString aCodec)
{
// Prevent duplicates.
MOZ_ASSERT(!Decrypts(aCodec));
// Can't both decrypt and decrypt-and-decode a codec.
MOZ_ASSERT(!DecryptsAndDecodes(aCodec));
mCodecsDecrypted.AppendElement(aCodec);
}
private:
nsTArray<EMECodecString> mCodecsDecoded;
nsTArray<EMECodecString> mCodecsDecrypted;
};
enum class KeySystemFeatureSupport
{
Prohibited = 1,
Requestable = 2,
Required = 3,
};
struct KeySystemConfig
{
nsString mKeySystem;
nsTArray<nsString> mInitDataTypes;
KeySystemFeatureSupport mPersistentState = KeySystemFeatureSupport::Prohibited;
KeySystemFeatureSupport mDistinctiveIdentifier = KeySystemFeatureSupport::Prohibited;
nsTArray<MediaKeySessionType> mSessionTypes;
nsTArray<nsString> mVideoRobustness;
nsTArray<nsString> mAudioRobustness;
KeySystemContainerSupport mMP4;
KeySystemContainerSupport mWebM;
};
static nsTArray<KeySystemConfig>
GetSupportedKeySystems()
{
nsTArray<KeySystemConfig> keySystemConfigs;
{
if (HavePluginForKeySystem(kEMEKeySystemClearkey)) {
KeySystemConfig clearkey;
clearkey.mKeySystem = NS_ConvertUTF8toUTF16(kEMEKeySystemClearkey);
clearkey.mInitDataTypes.AppendElement(NS_LITERAL_STRING("cenc"));
clearkey.mInitDataTypes.AppendElement(NS_LITERAL_STRING("keyids"));
clearkey.mInitDataTypes.AppendElement(NS_LITERAL_STRING("webm"));
clearkey.mPersistentState = KeySystemFeatureSupport::Requestable;
clearkey.mDistinctiveIdentifier = KeySystemFeatureSupport::Prohibited;
clearkey.mSessionTypes.AppendElement(MediaKeySessionType::Temporary);
if (MediaPrefs::ClearKeyPersistentLicenseEnabled()) {
clearkey.mSessionTypes.AppendElement(MediaKeySessionType::Persistent_license);
}
#if defined(XP_WIN)
// Clearkey CDM uses WMF's H.264 decoder on Windows.
if (WMFDecoderModule::HasH264()) {
clearkey.mMP4.SetCanDecryptAndDecode(EME_CODEC_H264);
} else {
clearkey.mMP4.SetCanDecrypt(EME_CODEC_H264);
}
#else
clearkey.mMP4.SetCanDecrypt(EME_CODEC_H264);
#endif
clearkey.mMP4.SetCanDecrypt(EME_CODEC_AAC);
if (Preferences::GetBool("media.eme.vp9-in-mp4.enabled", false)) {
clearkey.mMP4.SetCanDecrypt(EME_CODEC_VP9);
}
clearkey.mWebM.SetCanDecrypt(EME_CODEC_VORBIS);
clearkey.mWebM.SetCanDecrypt(EME_CODEC_OPUS);
clearkey.mWebM.SetCanDecrypt(EME_CODEC_VP8);
clearkey.mWebM.SetCanDecrypt(EME_CODEC_VP9);
keySystemConfigs.AppendElement(Move(clearkey));
}
}
{
if (HavePluginForKeySystem(kEMEKeySystemWidevine)) {
KeySystemConfig widevine;
widevine.mKeySystem = NS_ConvertUTF8toUTF16(kEMEKeySystemWidevine);
widevine.mInitDataTypes.AppendElement(NS_LITERAL_STRING("cenc"));
widevine.mInitDataTypes.AppendElement(NS_LITERAL_STRING("keyids"));
widevine.mInitDataTypes.AppendElement(NS_LITERAL_STRING("webm"));
widevine.mPersistentState = KeySystemFeatureSupport::Requestable;
widevine.mDistinctiveIdentifier = KeySystemFeatureSupport::Prohibited;
widevine.mSessionTypes.AppendElement(MediaKeySessionType::Temporary);
#ifdef MOZ_WIDGET_ANDROID
widevine.mSessionTypes.AppendElement(MediaKeySessionType::Persistent_license);
#endif
widevine.mAudioRobustness.AppendElement(NS_LITERAL_STRING("SW_SECURE_CRYPTO"));
widevine.mVideoRobustness.AppendElement(NS_LITERAL_STRING("SW_SECURE_CRYPTO"));
widevine.mVideoRobustness.AppendElement(NS_LITERAL_STRING("SW_SECURE_DECODE"));
#if defined(XP_WIN)
// Widevine CDM doesn't include an AAC decoder. So if WMF can't
// decode AAC, and a codec wasn't specified, be conservative
// and reject the MediaKeys request, since we assume Widevine
// will be used with AAC.
if (WMFDecoderModule::HasAAC()) {
widevine.mMP4.SetCanDecrypt(EME_CODEC_AAC);
}
#elif !defined(MOZ_WIDGET_ANDROID)
widevine.mMP4.SetCanDecrypt(EME_CODEC_AAC);
#endif
#if defined(MOZ_WIDGET_ANDROID)
using namespace mozilla::java;
// MediaDrm.isCryptoSchemeSupported only allows passing
// "video/mp4" or "video/webm" for mimetype string.
// See https://developer.android.com/reference/android/media/MediaDrm.html#isCryptoSchemeSupported(java.util.UUID, java.lang.String)
// for more detail.
typedef struct {
const nsCString& mMimeType;
const nsCString& mEMECodecType;
const char16_t* mCodecType;
KeySystemContainerSupport* mSupportType;
} DataForValidation;
DataForValidation validationList[] = {
{ nsCString("video/mp4"), EME_CODEC_H264, MediaDrmProxy::AVC, &widevine.mMP4 },
{ nsCString("video/mp4"), EME_CODEC_VP9, MediaDrmProxy::AVC, &widevine.mMP4 },
{ nsCString("audio/mp4"), EME_CODEC_AAC, MediaDrmProxy::AAC, &widevine.mMP4 },
{ nsCString("video/webm"), EME_CODEC_VP8, MediaDrmProxy::VP8, &widevine.mWebM },
{ nsCString("video/webm"), EME_CODEC_VP9, MediaDrmProxy::VP9, &widevine.mWebM},
{ nsCString("audio/webm"), EME_CODEC_VORBIS, MediaDrmProxy::VORBIS, &widevine.mWebM},
{ nsCString("audio/webm"), EME_CODEC_OPUS, MediaDrmProxy::OPUS, &widevine.mWebM},
};
for (const auto& data: validationList) {
if (MediaDrmProxy::IsCryptoSchemeSupported(kEMEKeySystemWidevine,
data.mMimeType)) {
if (MediaDrmProxy::CanDecode(data.mCodecType)) {
data.mSupportType->SetCanDecryptAndDecode(data.mEMECodecType);
} else {
data.mSupportType->SetCanDecrypt(data.mEMECodecType);
}
}
}
#else
widevine.mMP4.SetCanDecryptAndDecode(EME_CODEC_H264);
if (Preferences::GetBool("media.eme.vp9-in-mp4.enabled", false)) {
widevine.mMP4.SetCanDecryptAndDecode(EME_CODEC_VP9);
}
widevine.mWebM.SetCanDecrypt(EME_CODEC_VORBIS);
widevine.mWebM.SetCanDecrypt(EME_CODEC_OPUS);
widevine.mWebM.SetCanDecryptAndDecode(EME_CODEC_VP8);
widevine.mWebM.SetCanDecryptAndDecode(EME_CODEC_VP9);
#endif
keySystemConfigs.AppendElement(Move(widevine));
}
}
return keySystemConfigs;
}
static bool
GetKeySystemConfig(const nsAString& aKeySystem, KeySystemConfig& aOutKeySystemConfig)
{
for (auto&& config : GetSupportedKeySystems()) {
if (config.mKeySystem.Equals(aKeySystem)) {
aOutKeySystemConfig = mozilla::Move(config);
return true;
}
}
// No matching key system found.
return false;
}
/* static */
bool
MediaKeySystemAccess::KeySystemSupportsInitDataType(const nsAString& aKeySystem,
const nsAString& aInitDataType)
{
KeySystemConfig implementation;
return GetKeySystemConfig(aKeySystem, implementation) &&
implementation.mInitDataTypes.Contains(aInitDataType);
}
enum CodecType
{
Audio,
Video,
Invalid
};
static bool
CanDecryptAndDecode(const nsString& aKeySystem,
const nsString& aContentType,
CodecType aCodecType,
const KeySystemContainerSupport& aContainerSupport,
const nsTArray<EMECodecString>& aCodecs,
DecoderDoctorDiagnostics* aDiagnostics)
{
MOZ_ASSERT(aCodecType != Invalid);
for (const EMECodecString& codec : aCodecs) {
MOZ_ASSERT(!codec.IsEmpty());
if (aContainerSupport.DecryptsAndDecodes(codec)) {
// GMP can decrypt-and-decode this codec.
continue;
}
if (aContainerSupport.Decrypts(codec) &&
NS_SUCCEEDED(MediaSource::IsTypeSupported(aContentType, aDiagnostics))) {
// GMP can decrypt and is allowed to return compressed samples to
// Gecko to decode, and Gecko has a decoder.
continue;
}
// Neither the GMP nor Gecko can both decrypt and decode. We don't
// support this codec.
#if defined(XP_WIN)
// Widevine CDM doesn't include an AAC decoder. So if WMF can't
// decode AAC, and a codec wasn't specified, be conservative
// and reject the MediaKeys request, since we assume Widevine
// will be used with AAC.
if (codec == EME_CODEC_AAC &&
IsWidevineKeySystem(aKeySystem) &&
!WMFDecoderModule::HasAAC()) {
if (aDiagnostics) {
aDiagnostics->SetKeySystemIssue(
DecoderDoctorDiagnostics::eWidevineWithNoWMF);
}
}
#endif
return false;
}
return true;
}
static bool
ToSessionType(const nsAString& aSessionType, MediaKeySessionType& aOutType)
{
if (aSessionType.Equals(ToString(MediaKeySessionType::Temporary))) {
aOutType = MediaKeySessionType::Temporary;
return true;
}
if (aSessionType.Equals(ToString(MediaKeySessionType::Persistent_license))) {
aOutType = MediaKeySessionType::Persistent_license;
return true;
}
return false;
}
// 5.2.1 Is persistent session type?
static bool
IsPersistentSessionType(MediaKeySessionType aSessionType)
{
return aSessionType == MediaKeySessionType::Persistent_license;
}
CodecType
GetMajorType(const MediaMIMEType& aMIMEType)
{
if (aMIMEType.HasAudioMajorType()) {
return Audio;
}
if (aMIMEType.HasVideoMajorType()) {
return Video;
}
return Invalid;
}
static CodecType
GetCodecType(const EMECodecString& aCodec)
{
if (aCodec.Equals(EME_CODEC_AAC) ||
aCodec.Equals(EME_CODEC_OPUS) ||
aCodec.Equals(EME_CODEC_VORBIS)) {
return Audio;
}
if (aCodec.Equals(EME_CODEC_H264) ||
aCodec.Equals(EME_CODEC_VP8) ||
aCodec.Equals(EME_CODEC_VP9)) {
return Video;
}
return Invalid;
}
static bool
AllCodecsOfType(const nsTArray<EMECodecString>& aCodecs, const CodecType aCodecType)
{
for (const EMECodecString& codec : aCodecs) {
if (GetCodecType(codec) != aCodecType) {
return false;
}
}
return true;
}
static bool
IsParameterUnrecognized(const nsAString& aContentType)
{
nsAutoString contentType(aContentType);
contentType.StripWhitespace();
nsTArray<nsString> params;
nsAString::const_iterator start, end, semicolon, equalSign;
contentType.BeginReading(start);
contentType.EndReading(end);
semicolon = start;
// Find any substring between ';' & '='.
while (semicolon != end) {
if (FindCharInReadable(';', semicolon, end)) {
equalSign = ++semicolon;
if (FindCharInReadable('=', equalSign, end)) {
params.AppendElement(Substring(semicolon, equalSign));
semicolon = equalSign;
}
}
}
for (auto param : params) {
if (!param.LowerCaseEqualsLiteral("codecs") &&
!param.LowerCaseEqualsLiteral("profiles")) {
return true;
}
}
return false;
}
// 3.1.2.3 Get Supported Capabilities for Audio/Video Type
static Sequence<MediaKeySystemMediaCapability>
GetSupportedCapabilities(
const CodecType aCodecType,
const nsTArray<MediaKeySystemMediaCapability>& aRequestedCapabilities,
const MediaKeySystemConfiguration& aPartialConfig,
const KeySystemConfig& aKeySystem,
DecoderDoctorDiagnostics* aDiagnostics,
const std::function<void(const char*)>& aDeprecationLogFn)
{
// Let local accumulated configuration be a local copy of partial configuration.
// (Note: It's not necessary for us to maintain a local copy, as we don't need
// to test whether capabilites from previous calls to this algorithm work with
// the capabilities currently being considered in this call. )
// Let supported media capabilities be an empty sequence of
// MediaKeySystemMediaCapability dictionaries.
Sequence<MediaKeySystemMediaCapability> supportedCapabilities;
// For each requested media capability in requested media capabilities:
for (const MediaKeySystemMediaCapability& capabilities : aRequestedCapabilities) {
// Let content type be requested media capability's contentType member.
const nsString& contentTypeString = capabilities.mContentType;
// Let robustness be requested media capability's robustness member.
const nsString& robustness = capabilities.mRobustness;
// If content type is the empty string, return null.
if (contentTypeString.IsEmpty()) {
EME_LOG("MediaKeySystemConfiguration (label='%s') "
"MediaKeySystemMediaCapability('%s','%s') rejected; "
"audio or video capability has empty contentType.",
NS_ConvertUTF16toUTF8(aPartialConfig.mLabel).get(),
NS_ConvertUTF16toUTF8(contentTypeString).get(),
NS_ConvertUTF16toUTF8(robustness).get());
return Sequence<MediaKeySystemMediaCapability>();
}
// If content type is an invalid or unrecognized MIME type, continue
// to the next iteration.
Maybe<MediaContainerType> maybeContainerType =
MakeMediaContainerType(contentTypeString);
if (!maybeContainerType) {
EME_LOG("MediaKeySystemConfiguration (label='%s') "
"MediaKeySystemMediaCapability('%s','%s') unsupported; "
"failed to parse contentTypeString as MIME type.",
NS_ConvertUTF16toUTF8(aPartialConfig.mLabel).get(),
NS_ConvertUTF16toUTF8(contentTypeString).get(),
NS_ConvertUTF16toUTF8(robustness).get());
continue;
}
const MediaContainerType& containerType = *maybeContainerType;
bool invalid = false;
nsTArray<EMECodecString> codecs;
for (const auto& codecString : containerType.ExtendedType().Codecs().Range()) {
EMECodecString emeCodec = ToEMEAPICodecString(nsString(codecString));
if (emeCodec.IsEmpty()) {
invalid = true;
EME_LOG("MediaKeySystemConfiguration (label='%s') "
"MediaKeySystemMediaCapability('%s','%s') unsupported; "
"'%s' is an invalid codec string.",
NS_ConvertUTF16toUTF8(aPartialConfig.mLabel).get(),
NS_ConvertUTF16toUTF8(contentTypeString).get(),
NS_ConvertUTF16toUTF8(robustness).get(),
NS_ConvertUTF16toUTF8(codecString).get());
break;
}
codecs.AppendElement(emeCodec);
}
if (invalid) {
continue;
}
// If the user agent does not support container, continue to the next iteration.
// The case-sensitivity of string comparisons is determined by the appropriate RFC.
// (Note: Per RFC 6838 [RFC6838], "Both top-level type and subtype names are
// case-insensitive."'. We're using nsContentTypeParser and that is
// case-insensitive and converts all its parameter outputs to lower case.)
const bool isMP4 =
DecoderTraits::IsMP4SupportedType(containerType, aDiagnostics);
if (isMP4 && !aKeySystem.mMP4.IsSupported()) {
EME_LOG("MediaKeySystemConfiguration (label='%s') "
"MediaKeySystemMediaCapability('%s','%s') unsupported; "
"MP4 requested but unsupported.",
NS_ConvertUTF16toUTF8(aPartialConfig.mLabel).get(),
NS_ConvertUTF16toUTF8(contentTypeString).get(),
NS_ConvertUTF16toUTF8(robustness).get());
continue;
}
const bool isWebM = WebMDecoder::IsSupportedType(containerType);
if (isWebM && !aKeySystem.mWebM.IsSupported()) {
EME_LOG("MediaKeySystemConfiguration (label='%s') "
"MediaKeySystemMediaCapability('%s','%s') unsupported; "
"WebM requested but unsupported.",
NS_ConvertUTF16toUTF8(aPartialConfig.mLabel).get(),
NS_ConvertUTF16toUTF8(contentTypeString).get(),
NS_ConvertUTF16toUTF8(robustness).get());
continue;
}
if (!isMP4 && !isWebM) {
EME_LOG("MediaKeySystemConfiguration (label='%s') "
"MediaKeySystemMediaCapability('%s','%s') unsupported; "
"Unsupported or unrecognized container requested.",
NS_ConvertUTF16toUTF8(aPartialConfig.mLabel).get(),
NS_ConvertUTF16toUTF8(contentTypeString).get(),
NS_ConvertUTF16toUTF8(robustness).get());
continue;
}
// Let parameters be the RFC 6381[RFC6381] parameters, if any, specified by
// content type.
// If the user agent does not recognize one or more parameters, continue to
// the next iteration.
if (IsParameterUnrecognized(contentTypeString)) {
continue;
}
// Let media types be the set of codecs and codec constraints specified by
// parameters. The case-sensitivity of string comparisons is determined by
// the appropriate RFC or other specification.
// (Note: codecs array is 'parameter').
// If media types is empty:
if (codecs.IsEmpty()) {
// Log deprecation warning to encourage authors to not do this!
aDeprecationLogFn("MediaEMENoCodecsDeprecatedWarning");
// TODO: Remove this once we're sure it doesn't break the web.
// If container normatively implies a specific set of codecs and codec constraints:
// Let parameters be that set.
if (isMP4) {
if (aCodecType == Audio) {
codecs.AppendElement(EME_CODEC_AAC);
} else if (aCodecType == Video) {
codecs.AppendElement(EME_CODEC_H264);
}
} else if (isWebM) {
if (aCodecType == Audio) {
codecs.AppendElement(EME_CODEC_VORBIS);
} else if (aCodecType == Video) {
codecs.AppendElement(EME_CODEC_VP8);
}
}
// Otherwise: Continue to the next iteration.
// (Note: all containers we support have implied codecs, so don't continue here.)
}
// If container type is not strictly a audio/video type, continue to the next iteration.
const auto majorType = GetMajorType(containerType.Type());
if (majorType == Invalid) {
EME_LOG("MediaKeySystemConfiguration (label='%s') "
"MediaKeySystemMediaCapability('%s','%s') unsupported; "
"MIME type is not an audio or video MIME type.",
NS_ConvertUTF16toUTF8(aPartialConfig.mLabel).get(),
NS_ConvertUTF16toUTF8(contentTypeString).get(),
NS_ConvertUTF16toUTF8(robustness).get());
continue;
}
if (majorType != aCodecType || !AllCodecsOfType(codecs, aCodecType)) {
EME_LOG("MediaKeySystemConfiguration (label='%s') "
"MediaKeySystemMediaCapability('%s','%s') unsupported; "
"MIME type mixes audio codecs in video capabilities "
"or video codecs in audio capabilities.",
NS_ConvertUTF16toUTF8(aPartialConfig.mLabel).get(),
NS_ConvertUTF16toUTF8(contentTypeString).get(),
NS_ConvertUTF16toUTF8(robustness).get());
continue;
}
// If robustness is not the empty string and contains an unrecognized
// value or a value not supported by implementation, continue to the
// next iteration. String comparison is case-sensitive.
if (!robustness.IsEmpty()) {
if (majorType == Audio && !aKeySystem.mAudioRobustness.Contains(robustness)) {
EME_LOG("MediaKeySystemConfiguration (label='%s') "
"MediaKeySystemMediaCapability('%s','%s') unsupported; "
"unsupported robustness string.",
NS_ConvertUTF16toUTF8(aPartialConfig.mLabel).get(),
NS_ConvertUTF16toUTF8(contentTypeString).get(),
NS_ConvertUTF16toUTF8(robustness).get());
continue;
}
if (majorType == Video && !aKeySystem.mVideoRobustness.Contains(robustness)) {
EME_LOG("MediaKeySystemConfiguration (label='%s') "
"MediaKeySystemMediaCapability('%s','%s') unsupported; "
"unsupported robustness string.",
NS_ConvertUTF16toUTF8(aPartialConfig.mLabel).get(),
NS_ConvertUTF16toUTF8(contentTypeString).get(),
NS_ConvertUTF16toUTF8(robustness).get());
continue;
}
// Note: specified robustness requirements are satisfied.
}
// If the user agent and implementation definitely support playback of
// encrypted media data for the combination of container, media types,
// robustness and local accumulated configuration in combination with
// restrictions...
const auto& containerSupport = isMP4 ? aKeySystem.mMP4 : aKeySystem.mWebM;
if (!CanDecryptAndDecode(aKeySystem.mKeySystem,
contentTypeString,
majorType,
containerSupport,
codecs,
aDiagnostics)) {
EME_LOG("MediaKeySystemConfiguration (label='%s') "
"MediaKeySystemMediaCapability('%s','%s') unsupported; "
"codec unsupported by CDM requested.",
NS_ConvertUTF16toUTF8(aPartialConfig.mLabel).get(),
NS_ConvertUTF16toUTF8(contentTypeString).get(),
NS_ConvertUTF16toUTF8(robustness).get());
continue;
}
// ... add requested media capability to supported media capabilities.
if (!supportedCapabilities.AppendElement(capabilities, mozilla::fallible)) {
NS_WARNING("GetSupportedCapabilities: Malloc failure");
return Sequence<MediaKeySystemMediaCapability>();
}
// Note: omitting steps 3.13.2, our robustness is not sophisticated enough
// to require considering all requirements together.
}
return Move(supportedCapabilities);
}
// "Get Supported Configuration and Consent" algorithm, steps 4-7 for
// distinctive identifier, and steps 8-11 for persistent state. The steps
// are the same for both requirements/features, so we factor them out into
// a single function.
static bool
CheckRequirement(const MediaKeysRequirement aRequirement,
const KeySystemFeatureSupport aFeatureSupport,
MediaKeysRequirement& aOutRequirement)
{
// Let requirement be the value of candidate configuration's member.
MediaKeysRequirement requirement = aRequirement;
// If requirement is "optional" and feature is not allowed according to
// restrictions, set requirement to "not-allowed".
if (aRequirement == MediaKeysRequirement::Optional &&
aFeatureSupport == KeySystemFeatureSupport::Prohibited) {
requirement = MediaKeysRequirement::Not_allowed;
}
// Follow the steps for requirement from the following list:
switch (requirement) {
case MediaKeysRequirement::Required: {
// If the implementation does not support use of requirement in combination
// with accumulated configuration and restrictions, return NotSupported.
if (aFeatureSupport == KeySystemFeatureSupport::Prohibited) {
return false;
}
break;
}
case MediaKeysRequirement::Optional: {
// Continue with the following steps.
break;
}
case MediaKeysRequirement::Not_allowed: {
// If the implementation requires use of feature in combination with
// accumulated configuration and restrictions, return NotSupported.
if (aFeatureSupport == KeySystemFeatureSupport::Required) {
return false;
}
break;
}
default: {
return false;
}
}
// Set the requirement member of accumulated configuration to equal
// calculated requirement.
aOutRequirement = requirement;
return true;
}
// 3.1.2.2, step 12
// Follow the steps for the first matching condition from the following list:
// If the sessionTypes member is present in candidate configuration.
// Let session types be candidate configuration's sessionTypes member.
// Otherwise let session types be ["temporary"].
// Note: This returns an empty array on malloc failure.
static Sequence<nsString>
UnboxSessionTypes(const Optional<Sequence<nsString>>& aSessionTypes)
{
Sequence<nsString> sessionTypes;
if (aSessionTypes.WasPassed()) {
sessionTypes = aSessionTypes.Value();
} else {
// Note: fallible. Results in an empty array.
sessionTypes.AppendElement(ToString(MediaKeySessionType::Temporary),
mozilla::fallible);
}
return sessionTypes;
}
// 3.1.2.2 Get Supported Configuration and Consent
static bool
GetSupportedConfig(const KeySystemConfig& aKeySystem,
const MediaKeySystemConfiguration& aCandidate,
MediaKeySystemConfiguration& aOutConfig,
DecoderDoctorDiagnostics* aDiagnostics,
bool aInPrivateBrowsing,
const std::function<void(const char*)>& aDeprecationLogFn)
{
// Let accumulated configuration be a new MediaKeySystemConfiguration dictionary.
MediaKeySystemConfiguration config;
// Set the label member of accumulated configuration to equal the label member of
// candidate configuration.
config.mLabel = aCandidate.mLabel;
// If the initDataTypes member of candidate configuration is non-empty, run the
// following steps:
if (!aCandidate.mInitDataTypes.IsEmpty()) {
// Let supported types be an empty sequence of DOMStrings.
nsTArray<nsString> supportedTypes;
// For each value in candidate configuration's initDataTypes member:
for (const nsString& initDataType : aCandidate.mInitDataTypes) {
// Let initDataType be the value.
// If the implementation supports generating requests based on initDataType,
// add initDataType to supported types. String comparison is case-sensitive.
// The empty string is never supported.
if (aKeySystem.mInitDataTypes.Contains(initDataType)) {
supportedTypes.AppendElement(initDataType);
}
}
// If supported types is empty, return NotSupported.
if (supportedTypes.IsEmpty()) {
EME_LOG("MediaKeySystemConfiguration (label='%s') rejected; "
"no supported initDataTypes provided.",
NS_ConvertUTF16toUTF8(aCandidate.mLabel).get());
return false;
}
// Set the initDataTypes member of accumulated configuration to supported types.
if (!config.mInitDataTypes.Assign(supportedTypes)) {
return false;
}
}
if (!CheckRequirement(aCandidate.mDistinctiveIdentifier,
aKeySystem.mDistinctiveIdentifier,
config.mDistinctiveIdentifier)) {
EME_LOG("MediaKeySystemConfiguration (label='%s') rejected; "
"distinctiveIdentifier requirement not satisfied.",
NS_ConvertUTF16toUTF8(aCandidate.mLabel).get());
return false;
}
if (!CheckRequirement(aCandidate.mPersistentState,
aKeySystem.mPersistentState,
config.mPersistentState)) {
EME_LOG("MediaKeySystemConfiguration (label='%s') rejected; "
"persistentState requirement not satisfied.",
NS_ConvertUTF16toUTF8(aCandidate.mLabel).get());
return false;
}
if (config.mPersistentState == MediaKeysRequirement::Required &&
aInPrivateBrowsing) {
EME_LOG("MediaKeySystemConfiguration (label='%s') rejected; "
"persistentState requested in Private Browsing window.",
NS_ConvertUTF16toUTF8(aCandidate.mLabel).get());
return false;
}
Sequence<nsString> sessionTypes(UnboxSessionTypes(aCandidate.mSessionTypes));
if (sessionTypes.IsEmpty()) {
// Malloc failure.
return false;
}
// For each value in session types:
for (const auto& sessionTypeString : sessionTypes) {
// Let session type be the value.
MediaKeySessionType sessionType;
if (!ToSessionType(sessionTypeString, sessionType)) {
// (Assume invalid sessionType is unsupported as per steps below).
EME_LOG("MediaKeySystemConfiguration (label='%s') rejected; "
"invalid session type specified.",
NS_ConvertUTF16toUTF8(aCandidate.mLabel).get());
return false;
}
// If accumulated configuration's persistentState value is "not-allowed"
// and the Is persistent session type? algorithm returns true for session
// type return NotSupported.
if (config.mPersistentState == MediaKeysRequirement::Not_allowed &&
IsPersistentSessionType(sessionType)) {
EME_LOG("MediaKeySystemConfiguration (label='%s') rejected; "
"persistent session requested but keysystem doesn't"
"support persistent state.",
NS_ConvertUTF16toUTF8(aCandidate.mLabel).get());
return false;
}
// If the implementation does not support session type in combination
// with accumulated configuration and restrictions for other reasons,
// return NotSupported.
if (!aKeySystem.mSessionTypes.Contains(sessionType)) {
EME_LOG("MediaKeySystemConfiguration (label='%s') rejected; "
"session type '%s' unsupported by keySystem.",
NS_ConvertUTF16toUTF8(aCandidate.mLabel).get(),
NS_ConvertUTF16toUTF8(sessionTypeString).get());
return false;
}
// If accumulated configuration's persistentState value is "optional"
// and the result of running the Is persistent session type? algorithm
// on session type is true, change accumulated configuration's
// persistentState value to "required".
if (config.mPersistentState == MediaKeysRequirement::Optional &&
IsPersistentSessionType(sessionType)) {
config.mPersistentState = MediaKeysRequirement::Required;
}
}
// Set the sessionTypes member of accumulated configuration to session types.
config.mSessionTypes.Construct(Move(sessionTypes));
// If the videoCapabilities and audioCapabilities members in candidate
// configuration are both empty, return NotSupported.
if (aCandidate.mAudioCapabilities.IsEmpty() &&
aCandidate.mVideoCapabilities.IsEmpty()) {
// TODO: Most sites using EME still don't pass capabilities, so we
// can't reject on it yet without breaking them. So add this later.
// Log deprecation warning to encourage authors to not do this!
aDeprecationLogFn("MediaEMENoCapabilitiesDeprecatedWarning");
}
// If the videoCapabilities member in candidate configuration is non-empty:
if (!aCandidate.mVideoCapabilities.IsEmpty()) {
// Let video capabilities be the result of executing the Get Supported
// Capabilities for Audio/Video Type algorithm on Video, candidate
// configuration's videoCapabilities member, accumulated configuration,
// and restrictions.
Sequence<MediaKeySystemMediaCapability> caps =
GetSupportedCapabilities(Video,
aCandidate.mVideoCapabilities,
config,
aKeySystem,
aDiagnostics,
aDeprecationLogFn);
// If video capabilities is null, return NotSupported.
if (caps.IsEmpty()) {
EME_LOG("MediaKeySystemConfiguration (label='%s') rejected; "
"no supported video capabilities.",
NS_ConvertUTF16toUTF8(aCandidate.mLabel).get());
return false;
}
// Set the videoCapabilities member of accumulated configuration to video capabilities.
config.mVideoCapabilities = Move(caps);
} else {
// Otherwise:
// Set the videoCapabilities member of accumulated configuration to an empty sequence.
}
// If the audioCapabilities member in candidate configuration is non-empty:
if (!aCandidate.mAudioCapabilities.IsEmpty()) {
// Let audio capabilities be the result of executing the Get Supported Capabilities