attempt/experiment to gracefully stop the stream before/while renegot…

…iation

src/screencast/pipewire_screencast.c

@@ -101,6 +101,8 @@ static void pwr_handle_stream_param_changed(void *data, uint32_t id,
 		SPA_PARAM_META_size, SPA_POD_Int(sizeof(struct spa_meta_header)));
 
 	pw_stream_update_params(stream, params, 2);
+	cast->changed = false;
+	pw_stream_set_active(stream, true);
 }
 
 static void pwr_handle_stream_add_buffer(void *data, struct pw_buffer *buffer) {
@@ -154,6 +156,7 @@ static void pwr_handle_stream_remove_buffer(void *data, struct pw_buffer *buffer
 
 	logprint(TRACE, "pipewire: remove buffer event handle");
 
+	logprint(TRACE, "pipewire: buffer %p", buffer);
 	d = buffer->buffer->datas;
 	if (buffer == cast->current_pw_buffer) {
 		logprint(TRACE, "pipewire: can't remove buffer. still in use");
@@ -168,12 +171,18 @@ static void pwr_handle_stream_remove_buffer(void *data, struct pw_buffer *buffer
 	}
 }
 
+static void pwr_handle_stream_drained(void *data) {
+
+	logprint(TRACE, "pipewire: drained event handle");
+
+}
 static const struct pw_stream_events pwr_stream_events = {
 	PW_VERSION_STREAM_EVENTS,
 	.state_changed = pwr_handle_stream_state_changed,
 	.param_changed = pwr_handle_stream_param_changed,
 	.add_buffer = pwr_handle_stream_add_buffer,
 	.remove_buffer = pwr_handle_stream_remove_buffer,
+	.drained = pwr_handle_stream_drained,
 };
 
 void xdpw_pwr_import_buffer(struct xdpw_screencast_instance *cast) {
@@ -230,18 +239,15 @@ void xdpw_pwr_export_buffer(struct xdpw_screencast_instance *cast) {
 	logprint(TRACE, "pipewire: y_invert %d", cast->simple_frame.y_invert);
 	logprint(TRACE, "********************");
 
-	if (cast->current_pw_buffer) {
-		pw_stream_queue_buffer(cast->stream, pw_buf);
-	} else {
-		xdpw_pwr_destroy_shm_buffer(cast, pw_buf);
-	}
+	pw_stream_queue_buffer(cast->stream, pw_buf);
 
 	cast->current_pw_buffer = NULL;
 }
 
 void xdpw_pwr_destroy_shm_buffer(struct xdpw_screencast_instance *cast, struct pw_buffer *buffer) {
 	struct spa_data *d;
 
+	logprint(TRACE, "pipewire: destroy buffer %p", buffer);
 	d = buffer->buffer->datas;
 	wl_buffer_destroy(d[0].data);
 	d[0].data = NULL;
@@ -256,12 +262,19 @@ void pwr_update_stream_param(struct xdpw_screencast_instance *cast) {
 		SPA_POD_BUILDER_INIT(params_buffer, sizeof(params_buffer));
 	const struct spa_pod *params[1];
 
+
+	pw_stream_flush(stream, true);
+
 	enum spa_video_format format = xdpw_format_pw_from_wl_shm(cast);
 
 	params[0] = build_format(&b, format,
 			cast->simple_frame.width, cast->simple_frame.height, cast->framerate);
 
+	logprint(TRACE, "pipewire: params updated");
 	pw_stream_update_params(stream, params, 1);
+
+	//pw_stream_set_active(stream, false);
+	pw_stream_flush(stream, true);
 }
 
 void xdpw_pwr_stream_create(struct xdpw_screencast_instance *cast) {

src/screencast/wlr_screencast.c

@@ -34,7 +34,7 @@ void xdpw_wlr_frame_free(struct xdpw_screencast_instance *cast) {
 		return ;
 	}
 
-	if (cast->pwr_stream_state) {
+	if (cast->pwr_stream_state && !cast->changed) {
 		xdpw_wlr_frame_start(cast);
 	}
 }
@@ -106,7 +106,6 @@ static void wlr_frame_buffer_done(void *data,
 		if (cast->pwr_stream_state) {
 			pwr_update_stream_param(cast);
 		}
-		cast->changed = false;
 		xdpw_wlr_frame_free(cast);
 		return;
 	}