Add check for vaapi/vdpau libraries before loading them with implib

Telegram/SourceFiles/ffmpeg/ffmpeg_utility.cpp

@@ -18,6 +18,9 @@ For license and copyright information please follow this link:
 
 extern "C" {
 #include <libavutil/opt.h>
+#if !defined DESKTOP_APP_USE_PACKAGED && !defined Q_OS_WIN && !defined Q_OS_MAC
+#include <dlfcn.h>
+#endif // !DESKTOP_APP_USE_PACKAGED && !Q_OS_WIN && !Q_OS_MAC
 } // extern "C"
 
 namespace FFmpeg {
@@ -85,6 +88,47 @@ void PremultiplyLine(uchar *dst, const uchar *src, int intsCount) {
 #endif // LIB_FFMPEG_USE_QT_PRIVATE_API
 }
 
+#if !defined DESKTOP_APP_USE_PACKAGED && !defined Q_OS_WIN && !defined Q_OS_MAC
+[[nodiscard]] auto CheckHwLibs() {
+	auto list = std::deque{
+		AV_PIX_FMT_CUDA,
+	};
+	const auto vdpau = [&] {
+		if (const auto handle = dlopen("libvdpau.so.1", RTLD_LAZY)) {
+			dlclose(handle);
+		}
+		if (dlerror()) {
+			return false;
+		}
+		return true;
+	}();
+	if (vdpau) {
+		list.push_front(AV_PIX_FMT_VDPAU);
+	}
+	const auto va = [&] {
+		const auto list = std::array{
+			"libva-drm.so.1",
+			"libva-x11.so.1",
+			"libva.so.1",
+			"libdrm.so.2",
+		};
+		for (const auto lib : list) {
+			if (const auto handle = dlopen(lib, RTLD_LAZY)) {
+				dlclose(handle);
+			}
+			if (dlerror()) {
+				return false;
+			}
+		}
+		return true;
+	}();
+	if (va) {
+		list.push_front(AV_PIX_FMT_VAAPI);
+	}
+	return list;
+}
+#endif // !DESKTOP_APP_USE_PACKAGED && !Q_OS_WIN && !Q_OS_MAC
+
 [[nodiscard]] bool InitHw(AVCodecContext *context, AVHWDeviceType type) {
 	AVCodecContext *parent = static_cast<AVCodecContext*>(context->opaque);
 
@@ -125,6 +169,9 @@ void PremultiplyLine(uchar *dst, const uchar *src, int intsCount) {
 		}
 		return false;
 	};
+#if !defined DESKTOP_APP_USE_PACKAGED && !defined Q_OS_WIN && !defined Q_OS_MAC
+	static const auto list = CheckHwLibs();
+#else // !DESKTOP_APP_USE_PACKAGED && !Q_OS_WIN && !Q_OS_MAC
 	const auto list = std::array{
 #ifdef Q_OS_WIN
 		AV_PIX_FMT_D3D11,
@@ -138,6 +185,7 @@ void PremultiplyLine(uchar *dst, const uchar *src, int intsCount) {
 		AV_PIX_FMT_CUDA,
 #endif // Q_OS_WIN || Q_OS_MAC
 	};
+#endif // DESKTOP_APP_USE_PACKAGED || Q_OS_WIN || Q_OS_MAC
 	for (const auto format : list) {
 		if (!has(format)) {
 			continue;