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#pragma once
#include <NvFBC.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_LAZY);
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, bool direct_capture = false) {
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 = direct_capture ? NVFBC_FALSE : NVFBC_TRUE;
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;
create_capture_params.bAllowDirectCapture = direct_capture ? NVFBC_TRUE : NVFBC_FALSE;
create_capture_params.bPushModel = direct_capture ? NVFBC_TRUE : NVFBC_FALSE;
if(tracking_type == NVFBC_TRACKING_OUTPUT)
create_capture_params.dwOutputId = output_id;
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*/ void *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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