obs-multiple-image-source

Multiple-image-source is an obs-studio plugin based on slideshow source.This plugin also provides notation drawing feature on source.
Complete project: https://github.com/nemoofnemo/obs-studio

基于obs-slideshow的显示多张图片的插件，核心功能是像演示ppt一样演示多张图片并可以在源上绘制图形。

path

you can find source code in /obs-studio/plugins/image-source.
make sure CMakeLists.txt in image-source is correct.

register in image-source.c

... 
extern struct obs_source_info slideshow_info;
extern struct obs_source_info color_source_info;
extern struct obs_source_info multiple_image_source_info;

//pen source is protype of multiple-image-source.
//another implementation.
//extern struct obs_source_info pen_source_info;

bool obs_module_load(void)
{
	obs_register_source(&image_source_info);
	obs_register_source(&color_source_info);
	obs_register_source(&slideshow_info);
	obs_register_source(&multiple_image_source_info);
	//obs_register_source(&pen_source_info);
	return true;
}
-eof

create source

add file to source first.

OBSScene scene = GetCurrentScene();
if (!scene)
    return;

obs_data_t * settings = obs_data_create();
obs_data_array_t * arr = obs_data_array_create();
obs_data_t * item = obs_data_create();
obs_data_set_string(item, "value", "C:/Users/nemo/Pictures/Saved Pictures/5d4b1990f19600ae67ab5cd778c0ebd4.jpg");
obs_data_array_push_back(arr, item);
obs_data_release(item);
item = obs_data_create();
obs_data_set_string(item, "value", "C:/Users/nemo/Pictures/Saved Pictures/498da2d89f1878e408225405ac794feb.jpg");
obs_data_array_push_back(arr, item);
obs_data_release(item);
item = obs_data_create();
obs_data_set_string(item, "value", "C:/Users/nemo/Pictures/Saved Pictures/b8ce878cf1f7c2f5db3da241cdbda9fe.jpg");
obs_data_array_push_back(arr, item);
obs_data_release(item);
obs_data_set_array(settings, "files", arr);
obs_data_array_release(arr);

obs_source_t * source = obs_source_create("multiple_image_source", "ppt", settings, NULL);
obs_data_release(settings);

if (source) {
	obs_scene_atomic_update(scene, [](void *data, obs_scene_t *scene){
		obs_scene_add(scene, (obs_source_t *)data);
	}, source);
}

obs_source_update(source, settings);
obs_source_release(source);

handle mouse event

for example, you can handle mouse event in windows-basic-preview.cpp.
like this:

void OBSBasicPreview:mousePressEvent(QMouseEvent *event){
	......
	
	vec2 pos = GetMouseEventPos(event);
	float mouse_x = 0.0f;
	float mouse_y = 0.0f;
	mouse_x = pos.x;
	mouse_y = pos.y;

	OBSScene scene = main->GetCurrentScene();
	if (scene){
		obs_sceneitem_t * item = obs_scene_find_source(scene, "ppt");
		if (item){
			obs_source_t * s = obs_sceneitem_get_source(item);
			OBSData settings = obs_source_get_settings(s);
			obs_data_set_int(settings, "mouse_x", (int)mouse_x);
			obs_data_set_int(settings, "mouse_y", (int)mouse_y);
			obs_data_set_string(settings, "create_shape", "polyline");
			obs_data_set_bool(settings, "need_update", true);
			obs_data_release(settings);
		}
	}
	
	.....
}

...functions...

void OBSBasicPreview::mouseMoveEvent(QMouseEvent *event){
    .....
	
	vec2 pos = GetMouseEventPos(event);
	float mouse_x = 0.0f;
	float mouse_y = 0.0f;
	mouse_x = pos.x;
	mouse_y = pos.y;

	OBSBasic *main = reinterpret_cast<OBSBasic*>(App()->GetMainWindow());
	OBSScene scene = main->GetCurrentScene();
	if (scene){
		obs_sceneitem_t * item = obs_scene_find_source(scene, "ppt");
		if (item){
			obs_source_t * s = obs_sceneitem_get_source(item);
			OBSData settings = obs_source_get_settings(s);
			obs_data_set_int(settings, "mouse_x", (int)mouse_x);
			obs_data_set_int(settings, "mouse_y", (int)mouse_y);
			obs_data_set_bool(settings, "need_update", true);
			obs_data_release(settings);
			qDebug("update paint event");
		}
	}
	
	.....
}

todo

plugin change color line
circle
arrow
text
.....