1 files changed, 267 insertions, 0 deletions
diff --git a/src/pipewire/control.c b/src/pipewire/control.c
new file mode 100644
index 0000000..0e3afd7
--- /dev/null
+++ b/src/pipewire/control.c
@@ -0,0 +1,267 @@
+/* PipeWire
+ *
+ * Copyright © 2018 Wim Taymans
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <spa/pod/parser.h>
+#include <spa/debug/types.h>
+
+#include <pipewire/control.h>
+#include <pipewire/private.h>
+
+#define NAME "control"
+
+struct impl {
+	struct pw_control this;
+
+	struct pw_memblock *mem;
+};
+
+struct pw_control *
+pw_control_new(struct pw_context *context,
+	       struct pw_impl_port *port,
+	       uint32_t id, uint32_t size,
+	       size_t user_data_size)
+{
+	struct impl *impl;
+	struct pw_control *this;
+	enum spa_direction direction;
+
+	switch (id) {
+	case SPA_IO_Control:
+		direction = SPA_DIRECTION_INPUT;
+		break;
+	case SPA_IO_Notify:
+		direction = SPA_DIRECTION_OUTPUT;
+		break;
+	default:
+		errno = ENOTSUP;
+		goto error_exit;
+	}
+
+	impl = calloc(1, sizeof(struct impl) + user_data_size);
+	if (impl == NULL)
+		goto error_exit;
+
+	this = &impl->this;
+	this->id = id;
+	this->size = size;
+
+	pw_log_debug(NAME" %p: new %s %d", this,
+			spa_debug_type_find_name(spa_type_io, this->id), direction);
+
+	this->context = context;
+	this->port = port;
+	this->direction = direction;
+
+	spa_list_init(&this->links);
+
+        if (user_data_size > 0)
+		this->user_data = SPA_PTROFF(impl, sizeof(struct impl), void);
+
+	spa_hook_list_init(&this->listener_list);
+
+	spa_list_append(&context->control_list[direction], &this->link);
+	if (port) {
+		spa_list_append(&port->control_list[direction], &this->port_link);
+		pw_impl_port_emit_control_added(port, this);
+	}
+	return this;
+
+error_exit:
+	return NULL;
+}
+
+void pw_control_destroy(struct pw_control *control)
+{
+	struct impl *impl = SPA_CONTAINER_OF(control, struct impl, this);
+	struct pw_control_link *link;
+
+	pw_log_debug(NAME" %p: destroy", control);
+
+	pw_control_emit_destroy(control);
+
+	if (control->direction == SPA_DIRECTION_OUTPUT) {
+		spa_list_consume(link, &control->links, out_link)
+			pw_control_remove_link(link);
+	}
+	else {
+		spa_list_consume(link, &control->links, in_link)
+			pw_control_remove_link(link);
+	}
+
+	spa_list_remove(&control->link);
+
+	if (control->port) {
+		spa_list_remove(&control->port_link);
+		pw_impl_port_emit_control_removed(control->port, control);
+	}
+
+	pw_log_debug(NAME" %p: free", control);
+	pw_control_emit_free(control);
+
+	spa_hook_list_clean(&control->listener_list);
+
+	if (control->direction == SPA_DIRECTION_OUTPUT) {
+		if (impl->mem)
+			pw_memblock_unref(impl->mem);
+	}
+	free(control);
+}
+
+SPA_EXPORT
+struct pw_impl_port *pw_control_get_port(struct pw_control *control)
+{
+	return control->port;
+}
+
+SPA_EXPORT
+void pw_control_add_listener(struct pw_control *control,
+			     struct spa_hook *listener,
+			     const struct pw_control_events *events,
+			     void *data)
+{
+	spa_hook_list_append(&control->listener_list, listener, events, data);
+}
+
+static int port_set_io(struct pw_impl_port *port, uint32_t mix, uint32_t id, void *data, uint32_t size)
+{
+	int res;
+
+	if (port->mix) {
+		res = spa_node_port_set_io(port->mix, port->direction, mix, id, data, size);
+		if (SPA_RESULT_IS_OK(res))
+			return res;
+	}
+
+	if ((res = spa_node_port_set_io(port->node->node,
+			port->direction, port->port_id,
+			id, data, size)) < 0) {
+		pw_log_warn("port %p: set io failed %d %s", port,
+			res, spa_strerror(res));
+	}
+	return res;
+}
+
+SPA_EXPORT
+int pw_control_add_link(struct pw_control *control, uint32_t cmix,
+		struct pw_control *other, uint32_t omix,
+		struct pw_control_link *link)
+{
+	int res = 0;
+	struct impl *impl;
+	uint32_t size;
+
+	if (control->direction == SPA_DIRECTION_INPUT) {
+		SPA_SWAP(control, other);
+		SPA_SWAP(cmix, omix);
+	}
+	if (control->direction != SPA_DIRECTION_OUTPUT ||
+	    other->direction != SPA_DIRECTION_INPUT)
+		return -EINVAL;
+
+	impl = SPA_CONTAINER_OF(control, struct impl, this);
+
+	pw_log_debug(NAME" %p: link to %p %s", control, other,
+			spa_debug_type_find_name(spa_type_io, control->id));
+
+	size = SPA_MAX(control->size, other->size);
+
+	if (impl->mem == NULL) {
+		impl->mem = pw_mempool_alloc(control->context->pool,
+						PW_MEMBLOCK_FLAG_READWRITE |
+						PW_MEMBLOCK_FLAG_SEAL |
+						PW_MEMBLOCK_FLAG_MAP,
+						SPA_DATA_MemFd, size);
+		if (impl->mem == NULL) {
+			res = -errno;
+			goto exit;
+		}
+	}
+
+	if (spa_list_is_empty(&control->links)) {
+		if (control->port) {
+			if ((res = port_set_io(control->port, cmix,
+						control->id,
+						impl->mem->map->ptr, size)) < 0) {
+				pw_log_warn(NAME" %p: set io failed %d %s", control,
+					res, spa_strerror(res));
+				goto exit;
+			}
+		}
+	}
+
+	if (other->port) {
+		if ((res = port_set_io(other->port, omix,
+				other->id, impl->mem->map->ptr, size)) < 0) {
+			pw_log_warn(NAME" %p: set io failed %d %s", control,
+					res, spa_strerror(res));
+			goto exit;
+		}
+	}
+
+	link->output = control;
+	link->input = other;
+	link->out_port = cmix;
+	link->in_port = omix;
+	link->valid = true;
+	spa_list_append(&control->links, &link->out_link);
+	spa_list_append(&other->links, &link->in_link);
+
+	pw_control_emit_linked(control, other);
+	pw_control_emit_linked(other, control);
+exit:
+	return res;
+}
+
+SPA_EXPORT
+int pw_control_remove_link(struct pw_control_link *link)
+{
+	int res = 0;
+	struct pw_control *output = link->output;
+	struct pw_control *input = link->input;
+
+	pw_log_debug(NAME" %p: unlink from %p", output, input);
+
+	spa_list_remove(&link->in_link);
+	spa_list_remove(&link->out_link);
+	link->valid = false;
+
+	if (spa_list_is_empty(&output->links)) {
+		if ((res = port_set_io(output->port, link->out_port,
+					output->id, NULL, 0)) < 0) {
+			pw_log_warn(NAME" %p: can't unset port control io", output);
+		}
+	}
+
+	if (input->port) {
+		if ((res = port_set_io(input->port, link->in_port,
+				     input->id, NULL, 0)) < 0) {
+			pw_log_warn(NAME" %p: can't unset port control io", output);
+		}
+	}
+
+	pw_control_emit_unlinked(output, input);
+	pw_control_emit_unlinked(input, output);
+
+	return res;
+}