FS-8748 track pdf total pages and current page

src/include/switch_module_interfaces.h

@@ -393,6 +393,10 @@ struct switch_file_handle {
 	char *modname;
 	switch_mm_t mm;
 	switch_mutex_t *flag_mutex;
+	/*! total video duration, or total page in pdf*/
+	int64_t duration;
+	/*! current video position, or current page in pdf */
+	int64_t vpos;
 };
 
 /*! \brief Abstract interface to an asr module */

src/mod/formats/mod_imagick/mod_imagick.c

@@ -161,6 +161,7 @@ static switch_status_t imagick_file_open(switch_file_handle_t *handle, const cha
 	}
 
 	context->pagecount = GetImageListLength(context->images);
+	handle->duration = context->pagecount;
 
 	if (context->max) {
 		context->samples = (handle->samplerate / 1000) * context->max;
@@ -359,6 +360,7 @@ static switch_status_t imagick_file_seek(switch_file_handle_t *handle, unsigned
 		context->pagenumber = page;
 		context->same_page = 0;
 		*cur_sample = page;
+		handle->vpos = page;
 	}
 
 	return status;