diff --git a/spa/include/spa/filter-graph/filter-graph.h b/spa/include/spa/filter-graph/filter-graph.h
index 273d56f47..05904c7f3 100644
--- a/spa/include/spa/filter-graph/filter-graph.h
+++ b/spa/include/spa/filter-graph/filter-graph.h
@@ -63,11 +63,6 @@ struct spa_filter_graph_events {
 	void (*props_changed) (void *object, enum spa_direction direction);
 };
 
-struct spa_filter_graph_chunk {
-	void *data;
-	size_t size;
-};
-
 struct spa_filter_graph_methods {
 #define SPA_VERSION_FILTER_GRAPH_METHODS	0
 	uint32_t version;
@@ -87,9 +82,7 @@ struct spa_filter_graph_methods {
 
 	int (*reset) (void *object);
 
-	int (*process) (void *object,
-			const struct spa_filter_graph_chunk in[], uint32_t n_in,
-			struct spa_filter_graph_chunk out[], uint32_t n_out);
+	int (*process) (void *object, const void *in[], void *out[], uint32_t n_samples);
 };
 
 SPA_API_FILTER_GRAPH int spa_filter_graph_add_listener(struct spa_filter_graph *object,
@@ -139,11 +132,10 @@ SPA_API_FILTER_GRAPH int spa_filter_graph_reset(struct spa_filter_graph *object)
 }
 
 SPA_API_FILTER_GRAPH int spa_filter_graph_process(struct spa_filter_graph *object,
-			const struct spa_filter_graph_chunk in[], uint32_t n_in,
-			struct spa_filter_graph_chunk out[], uint32_t n_out)
+			const void *in[], void *out[], uint32_t n_samples)
 {
 	return spa_api_method_r(int, -ENOTSUP,
-			spa_filter_graph, &object->iface, process, 0, in, n_in, out, n_out);
+			spa_filter_graph, &object->iface, process, 0, in, out, n_samples);
 }
 
 /**
diff --git a/spa/plugins/filter-graph/filter-graph.c b/spa/plugins/filter-graph/filter-graph.c
index 68e393e6c..c06a6d519 100644
--- a/spa/plugins/filter-graph/filter-graph.c
+++ b/spa/plugins/filter-graph/filter-graph.c
@@ -236,39 +236,33 @@ impl_add_listener(void *object,
 }
 
 static int impl_process(void *object,
-		const struct spa_filter_graph_chunk in[], uint32_t n_in,
-		struct spa_filter_graph_chunk out[], uint32_t n_out)
+		const void *in[], void *out[], uint32_t n_samples)
 {
 	struct impl *impl = object;
 	struct graph *graph = &impl->graph;
-	uint32_t i, j, insize = 0, outsize = 0, n_hndl = graph->n_hndl;
+	uint32_t i, j, n_hndl = graph->n_hndl;
 	struct graph_port *port;
 
-	for (i = 0, j = 0; i < n_in; i++) {
+	for (i = 0, j = 0; i < impl->info.n_inputs; i++) {
 		while (j < graph->n_input) {
 			port = &graph->input[j++];
 			if (port->desc)
-				port->desc->connect_port(*port->hndl, port->port, in[i].data);
+				port->desc->connect_port(*port->hndl, port->port, (float*)in[i]);
 			if (!port->next)
 				break;
 		}
-		insize = i == 0 ? in[i].size : SPA_MIN(insize, in[i].size);
 	}
-	outsize = insize;
-
-	for (i = 0; i < n_out; i++) {
-		outsize = SPA_MIN(outsize, out[i].size);
-
+	for (i = 0; i < impl->info.n_outputs; i++) {
 		port = i < graph->n_output ? &graph->output[i] : NULL;
 
 		if (port && port->desc)
-			port->desc->connect_port(*port->hndl, port->port, out[i].data);
+			port->desc->connect_port(*port->hndl, port->port, (float*)out[i]);
 		else
-			memset(out[i].data, 0, outsize);
+			memset(out[i], 0, n_samples * sizeof(float));
 	}
 	for (i = 0; i < n_hndl; i++) {
 		struct graph_hndl *hndl = &graph->hndl[i];
-		hndl->desc->run(*hndl->hndl, outsize / sizeof(float));
+		hndl->desc->run(*hndl->hndl, n_samples);
 	}
 	return 0;
 }
diff --git a/src/modules/module-filter-chain.c b/src/modules/module-filter-chain.c
index 23a1a842b..cffd78dab 100644
--- a/src/modules/module-filter-chain.c
+++ b/src/modules/module-filter-chain.c
@@ -870,10 +870,11 @@ static void playback_process(void *d)
 {
 	struct impl *impl = d;
 	struct pw_buffer *in, *out;
-	uint32_t i, insize = 0, outsize = 0;
+	uint32_t i, data_size = 0;
 	int32_t stride = 0;
 	struct spa_data *bd;
-	struct spa_filter_graph_chunk cin[128], cout[128];
+	const void *cin[128];
+	void *cout[128];
 
 	in = NULL;
 	while (true) {
@@ -901,33 +902,28 @@ static void playback_process(void *d)
 		offs = SPA_MIN(bd->chunk->offset, bd->maxsize);
 		size = SPA_MIN(bd->chunk->size, bd->maxsize - offs);
 
-		cin[i].data = SPA_PTROFF(bd->data, offs, void);
-		cin[i].size = size;
+		cin[i] = SPA_PTROFF(bd->data, offs, void);
 
-		insize = i == 0 ? size : SPA_MIN(insize, size);
+		data_size = i == 0 ? size : SPA_MIN(data_size, size);
 		stride = SPA_MAX(stride, bd->chunk->stride);
 	}
-	outsize = insize;
 
 	for (i = 0; i < out->buffer->n_datas; i++) {
 		bd = &out->buffer->datas[i];
 
-		outsize = SPA_MIN(outsize, bd->maxsize);
+		data_size = SPA_MIN(data_size, bd->maxsize);
 
-		cout[i].data = bd->data;
-		cout[i].size = outsize;
+		cout[i] = bd->data;
 
 		bd->chunk->offset = 0;
-		bd->chunk->size = outsize;
+		bd->chunk->size = data_size;
 		bd->chunk->stride = stride;
 	}
 
-	pw_log_trace_fp("%p: stride:%d in:%d out:%d requested:%"PRIu64" (%"PRIu64")", impl,
-			stride, insize, outsize, out->requested, out->requested * stride);
+	pw_log_trace_fp("%p: stride:%d size:%d requested:%"PRIu64" (%"PRIu64")", impl,
+			stride, data_size, out->requested, out->requested * stride);
 
-	spa_filter_graph_process(impl->graph,
-			cin, in->buffer->n_datas,
-			cout, out->buffer->n_datas);
+	spa_filter_graph_process(impl->graph, cin, cout, data_size / sizeof(float));
 
 done:
 	if (in != NULL)