271 lines
11 KiB
C++
271 lines
11 KiB
C++
#pragma once
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#include <NvFBC.h>
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#include <dlfcn.h>
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#include <string.h>
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#include <stdio.h>
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#include <string.h>
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class NvFBCLibrary {
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public:
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~NvFBCLibrary() {
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if(fbc_handle_created) {
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NVFBC_DESTROY_CAPTURE_SESSION_PARAMS destroy_capture_params;
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memset(&destroy_capture_params, 0, sizeof(destroy_capture_params));
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destroy_capture_params.dwVersion = NVFBC_DESTROY_CAPTURE_SESSION_PARAMS_VER;
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nv_fbc_function_list.nvFBCDestroyCaptureSession(nv_fbc_handle, &destroy_capture_params);
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NVFBC_DESTROY_HANDLE_PARAMS destroy_params;
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memset(&destroy_params, 0, sizeof(destroy_params));
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destroy_params.dwVersion = NVFBC_DESTROY_HANDLE_PARAMS_VER;
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nv_fbc_function_list.nvFBCDestroyHandle(nv_fbc_handle, &destroy_params);
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}
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if(library)
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dlclose(library);
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}
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bool load() {
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if(library)
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return true;
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dlerror(); // clear
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void *lib = dlopen("libnvidia-fbc.so.1", RTLD_LAZY);
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if(!lib) {
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fprintf(stderr, "Error: failed to load libnvidia-fbc.so.1, error: %s\n", dlerror());
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return false;
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}
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nv_fbc_create_instance = (PNVFBCCREATEINSTANCE)dlsym(lib, "NvFBCCreateInstance");
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if(!nv_fbc_create_instance) {
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fprintf(stderr, "Error: unable to resolve symbol 'NvFBCCreateInstance'\n");
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dlclose(lib);
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return false;
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}
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memset(&nv_fbc_function_list, 0, sizeof(nv_fbc_function_list));
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nv_fbc_function_list.dwVersion = NVFBC_VERSION;
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NVFBCSTATUS status = nv_fbc_create_instance(&nv_fbc_function_list);
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if(status != NVFBC_SUCCESS) {
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fprintf(stderr, "Error: failed to create NvFBC instance (status: %d)\n", status);
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dlclose(lib);
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return false;
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}
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library = lib;
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return true;
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}
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// If |display_to_capture| is "screen", then the entire x11 screen is captured (all displays).
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bool create(const char *display_to_capture, uint32_t fps, /*out*/ uint32_t *display_width, /*out*/ uint32_t *display_height, uint32_t x = 0, uint32_t y = 0, uint32_t width = 0, uint32_t height = 0, bool direct_capture = false) {
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if(!library || !display_to_capture || !display_width || !display_height || fbc_handle_created)
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return false;
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const bool capture_region = (x > 0 || y > 0 || width > 0 || height > 0);
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NVFBCSTATUS status;
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NVFBC_TRACKING_TYPE tracking_type;
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bool capture_session_created = false;
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uint32_t output_id = 0;
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fbc_handle_created = false;
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NVFBC_CREATE_HANDLE_PARAMS create_params;
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memset(&create_params, 0, sizeof(create_params));
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create_params.dwVersion = NVFBC_CREATE_HANDLE_PARAMS_VER;
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status = nv_fbc_function_list.nvFBCCreateHandle(&nv_fbc_handle, &create_params);
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if(status != NVFBC_SUCCESS) {
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fprintf(stderr, "Error: %s\n", nv_fbc_function_list.nvFBCGetLastErrorStr(nv_fbc_handle));
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return false;
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}
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fbc_handle_created = true;
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NVFBC_GET_STATUS_PARAMS status_params;
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memset(&status_params, 0, sizeof(status_params));
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status_params.dwVersion = NVFBC_GET_STATUS_PARAMS_VER;
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status = nv_fbc_function_list.nvFBCGetStatus(nv_fbc_handle, &status_params);
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if(status != NVFBC_SUCCESS) {
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fprintf(stderr, "Error: %s\n", nv_fbc_function_list.nvFBCGetLastErrorStr(nv_fbc_handle));
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goto error_cleanup;
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}
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if(status_params.bCanCreateNow == NVFBC_FALSE) {
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fprintf(stderr, "Error: it's not possible to create a capture session on this system\n");
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goto error_cleanup;
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}
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tracking_type = strcmp(display_to_capture, "screen") == 0 ? NVFBC_TRACKING_SCREEN : NVFBC_TRACKING_OUTPUT;
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if(tracking_type == NVFBC_TRACKING_OUTPUT) {
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if(!status_params.bXRandRAvailable) {
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fprintf(stderr, "Error: the xrandr extension is not available\n");
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goto error_cleanup;
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}
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if(status_params.bInModeset) {
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fprintf(stderr, "Error: the x server is in modeset, unable to record\n");
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goto error_cleanup;
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}
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output_id = get_output_id_from_display_name(status_params.outputs, status_params.dwOutputNum, display_to_capture, display_width, display_height);
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if(output_id == 0) {
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fprintf(stderr, "Error: display '%s' not found\n", display_to_capture);
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goto error_cleanup;
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}
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} else {
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*display_width = status_params.screenSize.w;
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*display_height = status_params.screenSize.h;
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}
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NVFBC_CREATE_CAPTURE_SESSION_PARAMS create_capture_params;
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memset(&create_capture_params, 0, sizeof(create_capture_params));
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create_capture_params.dwVersion = NVFBC_CREATE_CAPTURE_SESSION_PARAMS_VER;
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create_capture_params.eCaptureType = NVFBC_CAPTURE_SHARED_CUDA;
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create_capture_params.bWithCursor = (!direct_capture || driver_supports_direct_capture_cursor()) ? NVFBC_TRUE : NVFBC_FALSE;
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if(capture_region) {
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create_capture_params.captureBox = { x, y, width, height };
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*display_width = width;
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*display_height = height;
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}
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create_capture_params.eTrackingType = tracking_type;
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create_capture_params.dwSamplingRateMs = 1000 / fps;
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create_capture_params.bAllowDirectCapture = direct_capture ? NVFBC_TRUE : NVFBC_FALSE;
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create_capture_params.bPushModel = direct_capture ? NVFBC_TRUE : NVFBC_FALSE;
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if(tracking_type == NVFBC_TRACKING_OUTPUT)
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create_capture_params.dwOutputId = output_id;
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status = nv_fbc_function_list.nvFBCCreateCaptureSession(nv_fbc_handle, &create_capture_params);
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if(status != NVFBC_SUCCESS) {
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fprintf(stderr, "Error: %s\n", nv_fbc_function_list.nvFBCGetLastErrorStr(nv_fbc_handle));
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goto error_cleanup;
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}
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capture_session_created = true;
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NVFBC_TOCUDA_SETUP_PARAMS setup_params;
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memset(&setup_params, 0, sizeof(setup_params));
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setup_params.dwVersion = NVFBC_TOCUDA_SETUP_PARAMS_VER;
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setup_params.eBufferFormat = NVFBC_BUFFER_FORMAT_BGRA;
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status = nv_fbc_function_list.nvFBCToCudaSetUp(nv_fbc_handle, &setup_params);
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if(status != NVFBC_SUCCESS) {
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fprintf(stderr, "Error: %s\n", nv_fbc_function_list.nvFBCGetLastErrorStr(nv_fbc_handle));
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goto error_cleanup;
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}
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return true;
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error_cleanup:
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if(fbc_handle_created) {
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if(capture_session_created) {
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NVFBC_DESTROY_CAPTURE_SESSION_PARAMS destroy_capture_params;
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memset(&destroy_capture_params, 0, sizeof(destroy_capture_params));
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destroy_capture_params.dwVersion = NVFBC_DESTROY_CAPTURE_SESSION_PARAMS_VER;
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nv_fbc_function_list.nvFBCDestroyCaptureSession(nv_fbc_handle, &destroy_capture_params);
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}
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NVFBC_DESTROY_HANDLE_PARAMS destroy_params;
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memset(&destroy_params, 0, sizeof(destroy_params));
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destroy_params.dwVersion = NVFBC_DESTROY_HANDLE_PARAMS_VER;
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nv_fbc_function_list.nvFBCDestroyHandle(nv_fbc_handle, &destroy_params);
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fbc_handle_created = false;
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}
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output_id = 0;
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return false;
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}
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bool capture(/*out*/ void *cu_device_ptr, uint32_t *byte_size) {
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if(!library || !fbc_handle_created || !cu_device_ptr || !byte_size)
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return false;
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NVFBCSTATUS status;
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NVFBC_FRAME_GRAB_INFO frame_info;
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memset(&frame_info, 0, sizeof(frame_info));
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NVFBC_TOCUDA_GRAB_FRAME_PARAMS grab_params;
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memset(&grab_params, 0, sizeof(grab_params));
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grab_params.dwVersion = NVFBC_TOCUDA_GRAB_FRAME_PARAMS_VER;
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grab_params.dwFlags = NVFBC_TOCUDA_GRAB_FLAGS_NOWAIT;
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grab_params.pFrameGrabInfo = &frame_info;
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grab_params.pCUDADeviceBuffer = cu_device_ptr;
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status = nv_fbc_function_list.nvFBCToCudaGrabFrame(nv_fbc_handle, &grab_params);
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if(status != NVFBC_SUCCESS) {
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fprintf(stderr, "Error: %s\n", nv_fbc_function_list.nvFBCGetLastErrorStr(nv_fbc_handle));
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return false;
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}
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*byte_size = frame_info.dwByteSize;
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// TODO: Check bIsNewFrame
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// TODO: Check dwWidth and dwHeight and update size in video output in ffmpeg. This can happen when xrandr is used to change monitor resolution
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return true;
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}
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private:
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static char to_upper(char c) {
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if(c >= 'a' && c <= 'z')
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return c - 32;
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else
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return c;
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}
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static bool strcase_equals(const char *str1, const char *str2) {
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for(;;) {
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char c1 = to_upper(*str1);
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char c2 = to_upper(*str2);
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if(c1 != c2)
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return false;
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if(c1 == '\0' || c2 == '\0')
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return true;
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++str1;
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++str2;
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}
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}
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// Returns 0 on failure
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static uint32_t get_output_id_from_display_name(NVFBC_RANDR_OUTPUT_INFO *outputs, uint32_t num_outputs, const char *display_name, uint32_t *display_width, uint32_t *display_height) {
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if(!outputs)
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return 0;
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for(uint32_t i = 0; i < num_outputs; ++i) {
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if(strcase_equals(outputs[i].name, display_name)) {
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*display_width = outputs[i].trackedBox.w;
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*display_height = outputs[i].trackedBox.h;
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return outputs[i].dwId;
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}
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}
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return 0;
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}
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// TODO: Test with optimus and open kernel modules
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static bool driver_supports_direct_capture_cursor() {
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FILE *f = fopen("/proc/driver/nvidia/version", "rb");
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if(!f)
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return false;
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char buffer[2048];
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size_t bytes_read = fread(buffer, 1, sizeof(buffer) - 1, f);
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buffer[bytes_read] = '\0';
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bool supports_cursor = false;
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const char *p = strstr(buffer, "Kernel Module");
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if(p) {
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p += 13;
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int driver_major_version = 0, driver_minor_version = 0;
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if(sscanf(p, "%d.%d", &driver_major_version, &driver_minor_version) == 2) {
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if(driver_major_version > 515 || (driver_major_version == 515 && driver_minor_version >= 57))
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supports_cursor = true;
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}
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}
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fclose(f);
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return supports_cursor;
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}
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private:
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void *library = nullptr;
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PNVFBCCREATEINSTANCE nv_fbc_create_instance = nullptr;
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NVFBC_API_FUNCTION_LIST nv_fbc_function_list;
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NVFBC_SESSION_HANDLE nv_fbc_handle;
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bool fbc_handle_created = false;
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};
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