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