Add support for desktop portal capture (-w portal)

1 files changed, 384 insertions, 0 deletions

diff --git a/src/capture/portal.c b/src/capture/portal.c
new file mode 100644
index 0000000..77da206
--- /dev/null
+++ b/src/capture/portal.c
@@ -0,0 +1,384 @@
+#include "../../include/capture/portal.h"
+#include "../../include/color_conversion.h"
+#include "../../include/egl.h"
+#include "../../include/utils.h"
+#include "../../include/dbus.h"
+#include "../../include/pipewire.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <assert.h>
+
+#include <libavcodec/avcodec.h>
+
+typedef struct {
+    gsr_capture_portal_params params;
+
+    bool should_stop;
+    bool stop_is_error;
+
+    unsigned int input_texture_id;
+    unsigned int cursor_texture_id;
+
+    gsr_dbus dbus;
+    char *session_handle;
+
+    uint32_t pipewire_node;
+    int pipewire_fd;
+    gsr_pipewire pipewire;
+    vec2i capture_size;
+} gsr_capture_portal;
+
+static void gsr_capture_portal_stop(gsr_capture_portal *self) {
+    if(self->input_texture_id) {
+        self->params.egl->glDeleteTextures(1, &self->input_texture_id);
+        self->input_texture_id = 0;
+    }
+
+    if(self->cursor_texture_id) {
+        self->params.egl->glDeleteTextures(1, &self->cursor_texture_id);
+        self->cursor_texture_id = 0;
+    }
+
+    if(self->pipewire_fd > 0) {
+        close(self->pipewire_fd);
+        self->pipewire_fd = -1;
+    }
+
+    gsr_pipewire_deinit(&self->pipewire);
+
+    if(self->session_handle) {
+        free(self->session_handle);
+        self->session_handle = NULL;
+    }
+
+    gsr_dbus_deinit(&self->dbus);
+}
+
+static void gsr_capture_portal_create_input_textures(gsr_capture_portal *self) {
+    self->params.egl->glGenTextures(1, &self->input_texture_id);
+    self->params.egl->glBindTexture(GL_TEXTURE_2D, self->input_texture_id);
+    self->params.egl->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    self->params.egl->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+    self->params.egl->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    self->params.egl->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    self->params.egl->glBindTexture(GL_TEXTURE_2D, 0);
+
+    self->params.egl->glGenTextures(1, &self->cursor_texture_id);
+    self->params.egl->glBindTexture(GL_TEXTURE_2D, self->cursor_texture_id);
+    self->params.egl->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    self->params.egl->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+    self->params.egl->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    self->params.egl->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    self->params.egl->glBindTexture(GL_TEXTURE_2D, 0);
+}
+
+static void get_gpu_screen_recorder_config_directory_path(char *buffer, size_t buffer_size) {
+    const char *xdg_config_home = getenv("XDG_CONFIG_HOME");
+    if(xdg_config_home) {
+        snprintf(buffer, buffer_size, "%s/gpu-screen-recorder", xdg_config_home);
+    } else {
+        const char *home = getenv("HOME");
+        if(!home)
+            home = "/tmp";
+        snprintf(buffer, buffer_size, "%s/.config/gpu-screen-recorder", home);
+    }
+}
+
+static void get_gpu_screen_recorder_restore_token_path(char *buffer, size_t buffer_size) {
+    const char *xdg_config_home = getenv("XDG_CONFIG_HOME");
+    if(xdg_config_home) {
+        snprintf(buffer, buffer_size, "%s/gpu-screen-recorder/restore_token", xdg_config_home);
+    } else {
+        const char *home = getenv("HOME");
+        if(!home)
+            home = "/tmp";
+        snprintf(buffer, buffer_size, "%s/.config/gpu-screen-recorder/restore_token", home);
+    }
+}
+
+static void gsr_capture_portal_save_restore_token(const char *restore_token) {
+    char config_path[PATH_MAX];
+    config_path[0] = '\0';
+    get_gpu_screen_recorder_config_directory_path(config_path, sizeof(config_path));
+
+    if(create_directory_recursive(config_path) != 0) {
+        fprintf(stderr, "gsr warning: gsr_capture_portal_save_restore_token: failed to create directory (%s) for restore token\n", config_path);
+        return;
+    }
+
+    char restore_token_path[PATH_MAX];
+    restore_token_path[0] = '\0';
+    get_gpu_screen_recorder_restore_token_path(restore_token_path, sizeof(restore_token_path));
+
+    FILE *f = fopen(restore_token_path, "wb");
+    if(!f) {
+        fprintf(stderr, "gsr warning: gsr_capture_portal_save_restore_token: failed to create restore token file (%s)\n", restore_token_path);
+        return;
+    }
+
+    const int restore_token_len = strlen(restore_token);
+    if((long)fwrite(restore_token, 1, restore_token_len, f) != restore_token_len) {
+        fprintf(stderr, "gsr warning: gsr_capture_portal_save_restore_token: failed to write restore token to file (%s)\n", restore_token_path);
+        fclose(f);
+        return;
+    }
+
+    fprintf(stderr, "gsr info: gsr_capture_portal_save_restore_token: saved restore token to cache (%s)\n", restore_token);
+    fclose(f);
+}
+
+static void gsr_capture_portal_get_restore_token_from_cache(char *buffer, size_t buffer_size) {
+    assert(buffer_size > 0);
+    buffer[0] = '\0';
+
+    char restore_token_path[PATH_MAX];
+    restore_token_path[0] = '\0';
+    get_gpu_screen_recorder_restore_token_path(restore_token_path, sizeof(restore_token_path));
+
+    FILE *f = fopen(restore_token_path, "rb");
+    if(!f) {
+        fprintf(stderr, "gsr info: gsr_capture_portal_get_restore_token_from_cache: no restore token found in cache or failed to load (%s)\n", restore_token_path);
+        return;
+    }
+
+    fseek(f, 0, SEEK_END);
+    long file_size = ftell(f);
+    fseek(f, 0, SEEK_SET);
+
+    fprintf(stderr, "file size: %ld\n", file_size);
+
+    if(file_size > 0 && file_size < 1024 && file_size < (long)buffer_size && (long)fread(buffer, 1, file_size, f) != file_size) {
+        buffer[0] = '\0';
+        fprintf(stderr, "gsr warning: gsr_capture_portal_get_restore_token_from_cache: failed to read restore token (%s)\n", restore_token_path);
+        fclose(f);
+        return;
+    }
+
+    if(file_size > 0 && file_size < (long)buffer_size)
+        buffer[file_size] = '\0';
+
+    fprintf(stderr, "gsr info: gsr_capture_portal_get_restore_token_from_cache: read cached restore token (%s)\n", buffer);
+    fclose(f);
+}
+
+static bool gsr_capture_portal_setup_dbus(gsr_capture_portal *self) {
+    char restore_token[1024];
+    restore_token[0] = '\0';
+    if(self->params.restore_portal_session)
+        gsr_capture_portal_get_restore_token_from_cache(restore_token, sizeof(restore_token));
+
+    if(!gsr_dbus_init(&self->dbus, restore_token))
+        return false;
+
+    fprintf(stderr, "gsr info: gsr_capture_portal_setup_dbus: CreateSession\n");
+    if(!gsr_dbus_screencast_create_session(&self->dbus, &self->session_handle)) {
+        fprintf(stderr, "gsr error: gsr_capture_portal_setup_dbus: CreateSession failed\n");
+        return false;
+    }
+
+    fprintf(stderr, "gsr info: gsr_capture_portal_setup_dbus: SelectSources\n");
+    if(!gsr_dbus_screencast_select_sources(&self->dbus, self->session_handle, GSR_PORTAL_CAPTURE_TYPE_MONITOR | GSR_PORTAL_CAPTURE_TYPE_WINDOW, self->params.record_cursor ? GSR_PORTAL_CURSOR_MODE_EMBEDDED : GSR_PORTAL_CURSOR_MODE_HIDDEN)) {
+        fprintf(stderr, "gsr error: gsr_capture_portal_setup_dbus: SelectSources failed\n");
+        return false;
+    }
+
+    fprintf(stderr, "gsr info: gsr_capture_portal_setup_dbus: Start\n");
+    if(!gsr_dbus_screencast_start(&self->dbus, self->session_handle, &self->pipewire_node)) {
+        fprintf(stderr, "gsr error: gsr_capture_portal_setup_dbus: Start failed\n");
+        return false;
+    }
+
+    const char *screencast_restore_token = gsr_dbus_screencast_get_restore_token(&self->dbus);
+    if(screencast_restore_token)
+        gsr_capture_portal_save_restore_token(screencast_restore_token);
+
+    fprintf(stderr, "gsr info: gsr_capture_portal_setup_dbus: OpenPipeWireRemote\n");
+    if(!gsr_dbus_screencast_open_pipewire_remote(&self->dbus, self->session_handle, &self->pipewire_fd)) {
+        fprintf(stderr, "gsr error: gsr_capture_portal_setup_dbus: OpenPipeWireRemote failed\n");
+        return false;
+    }
+
+    fprintf(stderr, "gsr info: gsr_capture_portal_setup_dbus: desktop portal setup finished\n");
+    return true;
+}
+
+static bool gsr_capture_portal_get_frame_dimensions(gsr_capture_portal *self) {
+    gsr_pipewire_region region = {0, 0, 0, 0};
+    gsr_pipewire_region cursor_region = {0, 0, 0, 0};
+    fprintf(stderr, "gsr info: gsr_capture_portal_start: waiting for pipewire negotiation\n");
+
+    const double start_time = clock_get_monotonic_seconds();
+    while(clock_get_monotonic_seconds() - start_time < 5.0) {
+        if(gsr_pipewire_map_texture(&self->pipewire, self->input_texture_id, self->cursor_texture_id, &region, &cursor_region)) {
+            self->capture_size.x = region.width;
+            self->capture_size.y = region.height;
+            fprintf(stderr, "gsr info: gsr_capture_portal_start: pipewire negotiation finished\n");
+            return true;
+        }
+        usleep(30 * 1000); /* 30 milliseconds */
+    }
+
+    fprintf(stderr, "gsr info: gsr_capture_portal_start: timed out waiting for pipewire negotiation (5 seconds)\n");
+    return false;
+}
+
+static int gsr_capture_portal_start(gsr_capture *cap, AVCodecContext *video_codec_context, AVFrame *frame) {
+    gsr_capture_portal *self = cap->priv;
+
+    gsr_capture_portal_create_input_textures(self);
+
+    if(!gsr_capture_portal_setup_dbus(self)) {
+        gsr_capture_portal_stop(self);
+        return -1;
+    }
+
+    fprintf(stderr, "gsr info: gsr_capture_portal_start: setting up pipewire\n");
+    /* TODO: support hdr when pipewire supports it */
+    if(!gsr_pipewire_init(&self->pipewire, self->pipewire_fd, self->pipewire_node, video_codec_context->framerate.num, self->params.record_cursor, self->params.egl)) {
+        fprintf(stderr, "gsr error: gsr_capture_portal_start: failed to setup pipewire with fd: %d, node: %" PRIu32 "\n", self->pipewire_fd, self->pipewire_node);
+        gsr_capture_portal_stop(self);
+        return -1;
+    }
+    self->pipewire_fd = -1;
+    fprintf(stderr, "gsr info: gsr_capture_portal_start: pipewire setup finished\n");
+
+    if(!gsr_capture_portal_get_frame_dimensions(self)) {
+        gsr_capture_portal_stop(self);
+        return -1;
+    }
+
+    /* Disable vsync */
+    self->params.egl->eglSwapInterval(self->params.egl->egl_display, 0);
+
+    video_codec_context->width = FFALIGN(self->capture_size.x, 2);
+    video_codec_context->height = FFALIGN(self->capture_size.y, 2);
+
+    frame->width = video_codec_context->width;
+    frame->height = video_codec_context->height;
+    return 0;
+}
+
+static int max_int(int a, int b) {
+    return a > b ? a : b;
+}
+
+static int gsr_capture_portal_capture(gsr_capture *cap, AVFrame *frame, gsr_color_conversion *color_conversion) {
+    (void)frame;
+    (void)color_conversion;
+    gsr_capture_portal *self = cap->priv;
+
+    //egl->glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
+    self->params.egl->glClear(0);
+
+    vec2i content_size = self->capture_size;
+
+    /* TODO: Handle formats other than RGB(a) */
+    gsr_pipewire_region region = {0, 0, 0, 0};
+    gsr_pipewire_region cursor_region = {0, 0, 0, 0};
+    if(gsr_pipewire_map_texture(&self->pipewire, self->input_texture_id, self->cursor_texture_id, &region, &cursor_region)) {
+        content_size.x = region.width;
+        content_size.y = region.height;
+    }
+    
+    const int target_x = max_int(0, frame->width / 2 - content_size.x / 2);
+    const int target_y = max_int(0, frame->height / 2 - content_size.y / 2);
+
+    gsr_color_conversion_draw(color_conversion, self->input_texture_id,
+        (vec2i){target_x, target_y}, content_size,
+        (vec2i){region.x, region.y}, content_size,
+        0.0f, false);
+
+    const vec2i cursor_pos = {
+        target_x + cursor_region.x,
+        target_y + cursor_region.y
+    };
+
+    self->params.egl->glEnable(GL_SCISSOR_TEST);
+    self->params.egl->glScissor(target_x, target_y, content_size.x, content_size.y);
+    gsr_color_conversion_draw(color_conversion, self->cursor_texture_id,
+        (vec2i){cursor_pos.x, cursor_pos.y}, (vec2i){cursor_region.width, cursor_region.height},
+        (vec2i){0, 0}, (vec2i){cursor_region.width, cursor_region.height},
+        0.0f, false);
+    self->params.egl->glDisable(GL_SCISSOR_TEST);
+
+    self->params.egl->eglSwapBuffers(self->params.egl->egl_display, self->params.egl->egl_surface);
+
+    //self->params.egl->glFlush();
+    //self->params.egl->glFinish();
+
+    return 0;
+}
+
+static bool gsr_capture_portal_should_stop(gsr_capture *cap, bool *err) {
+    gsr_capture_portal *cap_portal = cap->priv;
+    if(cap_portal->should_stop) {
+        if(err)
+            *err = cap_portal->stop_is_error;
+        return true;
+    }
+
+    if(err)
+        *err = false;
+    return false;
+}
+
+static void gsr_capture_portal_capture_end(gsr_capture *cap, AVFrame *frame) {
+    (void)cap;
+    (void)frame;
+}
+
+static gsr_source_color gsr_capture_portal_get_source_color(gsr_capture *cap) {
+    (void)cap;
+    return GSR_SOURCE_COLOR_RGB;
+}
+
+// static bool gsr_capture_portal_uses_external_image(gsr_capture *cap) {
+//     gsr_capture_portal *cap_portal = cap->priv;
+//     return cap_portal->params.egl->gpu_info.vendor == GSR_GPU_VENDOR_NVIDIA;
+// }
+
+static void gsr_capture_portal_destroy(gsr_capture *cap, AVCodecContext *video_codec_context) {
+    (void)video_codec_context;
+    gsr_capture_portal *cap_portal = cap->priv;
+    if(cap->priv) {
+        gsr_capture_portal_stop(cap_portal);
+        free(cap->priv);
+        cap->priv = NULL;
+    }
+    free(cap);
+}
+
+gsr_capture* gsr_capture_portal_create(const gsr_capture_portal_params *params) {
+    if(!params) {
+        fprintf(stderr, "gsr error: gsr_capture_portal_create params is NULL\n");
+        return NULL;
+    }
+
+    gsr_capture *cap = calloc(1, sizeof(gsr_capture));
+    if(!cap)
+        return NULL;
+
+    gsr_capture_portal *cap_portal = calloc(1, sizeof(gsr_capture_portal));
+    if(!cap_portal) {
+        free(cap);
+        return NULL;
+    }
+
+    cap_portal->params = *params;
+    
+    *cap = (gsr_capture) {
+        .start = gsr_capture_portal_start,
+        .tick = NULL,
+        .should_stop = gsr_capture_portal_should_stop,
+        .capture = gsr_capture_portal_capture,
+        .capture_end = gsr_capture_portal_capture_end,
+        .get_source_color = gsr_capture_portal_get_source_color,
+        .uses_external_image = NULL,
+        .destroy = gsr_capture_portal_destroy,
+        .priv = cap_portal
+    };
+
+    return cap;
+}