OBS PTZ Move Filter: Get Camera Current Position LUA script

PTZ-Camera-Get-Position.lua

local obs = obslua
local ffi = require("ffi")
local obsffi

local cur_settings
local prev_settings

ffi.cdef[[

struct obs_source;
struct obs_properties;
struct obs_property;
struct obs_data;
typedef struct obs_source obs_source_t;
typedef struct obs_properties obs_properties_t;
typedef struct obs_property obs_property_t;
typedef struct obs_data obs_data_t;

obs_source_t *obs_get_source_by_name(const char *name);
obs_source_t *obs_source_get_filter_by_name(obs_source_t *source, const char *name);
obs_properties_t *obs_source_properties(const obs_source_t *source);
obs_property_t *obs_properties_first(obs_properties_t *props);
bool obs_property_next(obs_property_t **p);
const char *obs_property_name(obs_property_t *p);
void obs_properties_destroy(obs_properties_t *props);
void obs_source_release(obs_source_t *source);
bool obs_property_button_clicked(obs_property_t *p, void *obj);
obs_data_t *obs_source_get_settings(const obs_source_t *source);
const char *obs_data_get_json(obs_data_t *data);

]]

if ffi.os == "OSX" then
    obsffi = ffi.load("obs.0.dylib")
else
    obsffi = ffi.load("obs")
end

local function filterTest()
    local source = obsffi.obs_get_source_by_name("Video Capture Device data")
    if source then
        local fSource = obsffi.obs_source_get_filter_by_name(source, "mVideo")
        if fSource then
            local props = obsffi.obs_source_properties(fSource)
            if props then
                local prop = obsffi.obs_properties_first(props)
                local name = obsffi.obs_property_name(prop)
                if name then
                    local propCount = 1
                    --obs.script_log(obs.LOG_INFO, string.format("Property 1 = %s", ffi.string(name)))
                    local _p = ffi.new("obs_property_t *[1]", prop)
                    local foundProp = obsffi.obs_property_next(_p)
                    prop = ffi.new("obs_property_t *", _p[0])
                    while foundProp do
                        propCount = propCount + 1
                        name = obsffi.obs_property_name(prop)

                        if ffi.string(name) == "value_get" then
                            --obs.script_log(obs.LOG_INFO, string.format("Property %d = %s", propCount, ffi.string(name)))
                            obsffi.obs_property_button_clicked(prop, fSource)
                            cur_settings = obsffi.obs_source_get_settings(fSource)
                            print(ffi.string(obsffi.obs_data_get_json(cur_settings)))
                        end    
                        
                        _p = ffi.new("obs_property_t *[1]", prop)
                        foundProp = obsffi.obs_property_next(_p)
                        prop = ffi.new("obs_property_t *", _p[0])
                    end

                end
                obsffi.obs_properties_destroy(props)
            end
            obsffi.obs_source_release(fSource)
        end
        obsffi.obs_source_release(source)
    end
end

local function timer_callback()
	filterTest()
end

obs.timer_add(timer_callback, 1000);

This GIST gets the current Pan, Tilt, Zoom position values from the Move Transition filter.
The PTZ Camera Source is named "Video Capture Device data" and the Move Video Filter is named "mVideo"
The current values are returned once per second. The 1 per second rate may be a firmware limit.

Add this script to the OBS scripts. Tools-->Scripts.
View the "Script log" to see the script results.