Refactor nvfbc into abstract capture api

4 files changed, 50 insertions, 278 deletions

diff --git a/include/NvFBCLibrary.hpp b/include/NvFBCLibrary.hpp
deleted file mode 100644
index 19b9bcc..0000000
--- a/include/NvFBCLibrary.hpp
+++ /dev/null
@@ -1,278 +0,0 @@
-#pragma once
-
-#include "../external/NvFBC.h"
-#include <dlfcn.h>
-#include <string.h>
-#include <stdio.h>
-#include <string.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) {
-            // Reverse engineering for interoperability
-            const uint8_t enable_key[] = { 0xac, 0x10, 0xc9, 0x2e, 0xa5, 0xe6, 0x87, 0x4f, 0x8f, 0x4b, 0xf4, 0x61, 0xf8, 0x56, 0x27, 0xe9 };
-            create_params.privateData = enable_key;
-            create_params.privateDataSize = 16;
-
-            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 || driver_supports_direct_capture_cursor()) ? NVFBC_TRUE : NVFBC_FALSE;
-        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 | NVFBC_TOCUDA_GRAB_FLAGS_FORCE_REFRESH;
-        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
-    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) {
-        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;
-    }
-
-    // TODO: Test with optimus and open kernel modules
-    static bool driver_supports_direct_capture_cursor() {
-        FILE *f = fopen("/proc/driver/nvidia/version", "rb");
-        if(!f)
-            return false;
-
-        char buffer[2048];
-        size_t bytes_read = fread(buffer, 1, sizeof(buffer) - 1, f);
-        buffer[bytes_read] = '\0';
-
-        bool supports_cursor = false;
-        const char *p = strstr(buffer, "Kernel Module");
-        if(p) {
-            p += 13;
-            int driver_major_version = 0, driver_minor_version = 0;
-            if(sscanf(p, "%d.%d", &driver_major_version, &driver_minor_version) == 2) {
-                if(driver_major_version > 515 || (driver_major_version == 515 && driver_minor_version >= 57))
-                    supports_cursor = true;
-            }
-        }
-
-        fclose(f);
-        return supports_cursor;
-    }
-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;
-};
diff --git a/include/capture/capture.h b/include/capture/capture.h
new file mode 100644
index 0000000..9e23a23
--- /dev/null
+++ b/include/capture/capture.h
@@ -0,0 +1,25 @@
+#ifndef GSR_CAPTURE_CAPTURE_H
+#define GSR_CAPTURE_CAPTURE_H
+
+#include <stdbool.h>
+
+typedef struct AVFrame AVFrame;
+
+typedef struct gsr_capture gsr_capture;
+
+struct gsr_capture {
+    int (*start)(gsr_capture *cap);
+    void (*stop)(gsr_capture *cap);
+    int (*capture)(gsr_capture *cap, AVFrame *frame);
+    void (*destroy)(gsr_capture *cap);
+
+    void *priv;
+};
+
+int gsr_capture_start(gsr_capture *cap);
+void gsr_capture_stop(gsr_capture *cap);
+int gsr_capture_capture(gsr_capture *cap, AVFrame *frame);
+/* Calls |gsr_capture_stop| as well */
+void gsr_capture_destroy(gsr_capture *cap);
+
+#endif /* GSR_CAPTURE_CAPTURE_H */
diff --git a/include/capture/nvfbc.h b/include/capture/nvfbc.h
new file mode 100644
index 0000000..b749b87
--- /dev/null
+++ b/include/capture/nvfbc.h
@@ -0,0 +1,17 @@
+#ifndef GSR_CAPTURE_NVFBC_H
+#define GSR_CAPTURE_NVFBC_H
+
+#include "capture.h"
+#include "../vec2.h"
+
+typedef struct {
+    const char *display_to_capture; /* if this is "screen", then the entire x11 screen is captured (all displays) */
+    int fps;
+    vec2i pos;
+    vec2i size;
+    bool direct_capture; /* temporary disabled */
+} gsr_capture_nvfbc_params;
+
+gsr_capture* gsr_capture_nvfbc_create(const gsr_capture_nvfbc_params *params);
+
+#endif /* GSR_CAPTURE_NVFBC_H */
diff --git a/include/vec2.h b/include/vec2.h
new file mode 100644
index 0000000..d1957ef
--- /dev/null
+++ b/include/vec2.h
@@ -0,0 +1,8 @@
+#ifndef VEC2_H
+#define VEC2_H
+
+typedef struct {
+    int x, y;
+} vec2i;
+
+#endif /* VEC2_H */
\ No newline at end of file