aboutsummaryrefslogtreecommitdiff
path: root/include/NvFBCLibrary.hpp
blob: 6d115a4d47048c11ac672056bf27d9ca8116b6e2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
#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, 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*/ 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;
};