Add OCR filter callbacks for media events and enable state management

CMakeLists.txt

@@ -85,6 +85,7 @@ target_sources(
           src/obs-utils.cpp
           src/tesseract-ocr-utils.cpp
           src/ocr-filter.cpp
+          src/ocr-filter-callbacks.cpp
           src/ocr-filter-info.c
           src/text-render-helper.cpp)
 

src/ocr-filter-callbacks.cpp

@@ -0,0 +1,18 @@
+
+#include "filter-data.h"
+#include "plugin-support.h"
+
+#include <obs.h>
+
+void enable_callback(void *data_, calldata_t *cd)
+{
+	filter_data *gf_ = static_cast<struct filter_data *>(data_);
+	bool enable = calldata_bool(cd, "enabled");
+	if (enable) {
+		obs_log(LOG_INFO, "enable_callback: enable");
+		gf_->isDisabled = false;
+	} else {
+		obs_log(LOG_INFO, "enable_callback: disable");
+		gf_->isDisabled = true;
+	}
+}

src/ocr-filter-callbacks.h

@@ -0,0 +1,5 @@
+#pragma once
+
+#include <callback/calldata.h>
+
+void enable_callback(void *data_, calldata_t *cd);

src/ocr-filter.cpp

@@ -17,6 +17,7 @@
 #include "consts.h"
 #include "tesseract-ocr-utils.h"
 #include "ocr-filter.h"
+#include "ocr-filter-callbacks.h"
 
 const char *ocr_filter_getname(void *unused)
 {
@@ -79,12 +80,14 @@ void ocr_filter_update(void *data, obs_data_t *settings)
 void ocr_filter_activate(void *data)
 {
 	struct filter_data *tf = reinterpret_cast<filter_data *>(data);
+	obs_log(LOG_INFO, "ocr_filter_activate");
 	tf->isDisabled = false;
 }
 
 void ocr_filter_deactivate(void *data)
 {
 	struct filter_data *tf = reinterpret_cast<filter_data *>(data);
+	obs_log(LOG_INFO, "ocr_filter_deactivate");
 	tf->isDisabled = true;
 }
 
@@ -119,13 +122,25 @@ void *ocr_filter_create(obs_data_t *settings, obs_source_t *source)
 
 	ocr_filter_update(tf, settings);
 
+	signal_handler_t *sh_filter = obs_source_get_signal_handler(tf->source);
+	if (sh_filter == nullptr) {
+		obs_log(LOG_ERROR, "Failed to get signal handler");
+		tf->isDisabled = true;
+		return nullptr;
+	}
+
+	signal_handler_connect(sh_filter, "enable", enable_callback, tf);
+
 	return tf;
 }
 
 void ocr_filter_destroy(void *data)
 {
 	struct filter_data *tf = reinterpret_cast<filter_data *>(data);
 
+	signal_handler_t *sh_filter = obs_source_get_signal_handler(tf->source);
+	signal_handler_disconnect(sh_filter, "enable", enable_callback, tf);
+
 	if (tf) {
 		obs_enter_graphics();
 		gs_texrender_destroy(tf->texrender);