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Implement fast AES detection logic for Windows and macOS

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This commit is contained in:
Cameron Gutman 2024-01-15 13:40:13 -06:00
parent 75ddac54c5
commit ce8b24dfa7
3 changed files with 42 additions and 3 deletions
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13
app/streaming/session.cpp
View file

@ -604,9 +604,16 @@ bool Session::initialize()
m_StreamConfig.bitrate = m_Preferences->bitrateKbps; m_StreamConfig.bitrate = m_Preferences->bitrateKbps;
#ifndef STEAM_LINK #ifndef STEAM_LINK
// Enable audio encryption as long as we're not on Steam Link. // Opt-in to all encryption features if we detect that the platform
// That hardware can hardly handle Opus decoding at all. // has AES cryptography acceleration instructions.
m_StreamConfig.encryptionFlags = ENCFLG_AUDIO; if (StreamUtils::hasFastAes()) {
m_StreamConfig.encryptionFlags = ENCFLG_ALL;
}
else {
// Enable audio encryption as long as we're not on Steam Link.
// That hardware can hardly handle Opus decoding at all.
m_StreamConfig.encryptionFlags = ENCFLG_AUDIO;
}
#endif #endif
SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION, SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,

29
app/streaming/streamutils.cpp
View file

@ -6,6 +6,10 @@
#include <ApplicationServices/ApplicationServices.h> #include <ApplicationServices/ApplicationServices.h>
#endif #endif
#ifdef Q_OS_WINDOWS
#include <Windows.h>
#endif
Uint32 StreamUtils::getPlatformWindowFlags() Uint32 StreamUtils::getPlatformWindowFlags()
{ {
#if defined(Q_OS_DARWIN) #if defined(Q_OS_DARWIN)
@ -95,6 +99,31 @@ int StreamUtils::getDisplayRefreshRate(SDL_Window* window)
return mode.refresh_rate; return mode.refresh_rate;
} }
bool StreamUtils::hasFastAes()
{
#ifndef __has_builtin
#define __has_builtin(x) 0
#endif
#if __has_builtin(__builtin_cpu_supports) && defined(Q_PROCESSOR_X86)
return __builtin_cpu_supports("aes");
#elif defined(__BUILTIN_CPU_SUPPORTS__) && defined(Q_PROCESSOR_POWER)
return __builtin_cpu_supports("vcrypto");
#elif defined(Q_OS_WINDOWS) && defined(Q_PROCESSOR_ARM)
return IsProcessorFeaturePresent(PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE);
#elif defined(_MSC_VER) && defined(Q_PROCESSOR_X86)
int regs[4];
__cpuid(regs, 1);
return regs[2] & (1 << 25); // AES-NI
#elif defined(Q_OS_DARWIN)
// Everything that runs Catalina and later has AES-NI or ARMv8 crypto instructions
return true;
#else
// Assume AES is fast if we don't recognize the OS or processor
return true;
#endif
}
bool StreamUtils::getNativeDesktopMode(int displayIndex, SDL_DisplayMode* mode) bool StreamUtils::getNativeDesktopMode(int displayIndex, SDL_DisplayMode* mode)
{ {
#ifdef Q_OS_DARWIN #ifdef Q_OS_DARWIN

3
app/streaming/streamutils.h
View file

@ -33,4 +33,7 @@ public:
static static
int getDisplayRefreshRate(SDL_Window* window); int getDisplayRefreshRate(SDL_Window* window);
static
bool hasFastAes();
}; };