FS-9808 #resolve [mod_png issue when used with ivr as video input]

src/mod/formats/mod_png/mod_png.c

@@ -50,6 +50,7 @@ struct png_file_context {
 	int max;
 	int samples;
 	switch_file_handle_t *audio_fh;
+	int done;
 };
 
 typedef struct png_file_context png_file_context_t;
@@ -144,6 +145,8 @@ static switch_status_t png_file_close(switch_file_handle_t *handle)
 	
 	if (context->audio_fh) switch_core_file_close(context->audio_fh);
 
+	context->done = 1;
+
 	return SWITCH_STATUS_SUCCESS;
 }
 
@@ -152,6 +155,10 @@ static switch_status_t png_file_read(switch_file_handle_t *handle, void *data, s
 
 	png_file_context_t *context = (png_file_context_t *)handle->private_info;
 
+	if (context->done) {
+		return SWITCH_STATUS_FALSE;
+	}
+
 	if (context->audio_fh) {
 		return switch_core_file_read(context->audio_fh, data, len);
 	}
@@ -183,6 +190,10 @@ static switch_status_t png_file_read_video(switch_file_handle_t *handle, switch_
 	switch_image_t *dup = NULL;
 	int have_frame = 0;
 
+	if (context->done) {
+		return SWITCH_STATUS_FALSE;
+	}
+
 	if ((flags & SVR_CHECK)) {
 		return SWITCH_STATUS_BREAK;
 	}

src/switch_core_media.c

@@ -6081,7 +6081,14 @@ SWITCH_DECLARE(switch_status_t) switch_core_media_set_video_file(switch_core_ses
 		switch_mutex_unlock(v_engine->mh.file_read_mutex);
 
 	} else {
+		if (!fh && smh->video_write_thread) {
+			if (smh->video_write_thread_running > 0) {
+				smh->video_write_thread_running = -1;
+			}
+		}
+
 		switch_mutex_lock(v_engine->mh.file_write_mutex);
+
 		if (fh && smh->video_write_fh) {
 			switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "File is already open\n");
 			smh->video_write_fh = fh;