diff options
Diffstat (limited to 'include/NvFBCLibrary.hpp')
| -rw-r--r-- | include/NvFBCLibrary.hpp | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/include/NvFBCLibrary.hpp b/include/NvFBCLibrary.hpp new file mode 100644 index 0000000..a0bf045 --- /dev/null +++ b/include/NvFBCLibrary.hpp @@ -0,0 +1,245 @@ +#pragma once + +#include "NvFBC.h" +#include <cuda.h> + +#include <dlfcn.h> +#include <string.h> +#include <stdio.h> + +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; +};
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