Adding upstream version 0.3.65.upstream/0.3.65upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1006 insertions, 0 deletions

diff --git a/spa/plugins/alsa/alsa-seq-bridge.c b/spa/plugins/alsa/alsa-seq-bridge.c
new file mode 100644
index 0000000..ee50163
--- /dev/null
+++ b/spa/plugins/alsa/alsa-seq-bridge.c
@@ -0,0 +1,1006 @@
+/* Spa ALSA Source
+ *
+ * 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 <stddef.h>
+#include <ctype.h>
+
+#include <alsa/asoundlib.h>
+
+#include <spa/node/node.h>
+#include <spa/node/utils.h>
+#include <spa/node/keys.h>
+#include <spa/utils/keys.h>
+#include <spa/utils/names.h>
+#include <spa/utils/string.h>
+#include <spa/utils/list.h>
+#include <spa/monitor/device.h>
+#include <spa/param/audio/format.h>
+#include <spa/param/latency-utils.h>
+#include <spa/pod/filter.h>
+
+#include "alsa-seq.h"
+
+#define DEFAULT_DEVICE		"default"
+#define DEFAULT_CLOCK_NAME	"clock.system.monotonic"
+
+static void reset_props(struct props *props)
+{
+	strncpy(props->device, DEFAULT_DEVICE, sizeof(props->device));
+	strncpy(props->clock_name, DEFAULT_CLOCK_NAME, sizeof(props->clock_name));
+	props->disable_longname = 0;
+}
+
+static int impl_node_enum_params(void *object, int seq,
+				 uint32_t id, uint32_t start, uint32_t num,
+				 const struct spa_pod *filter)
+{
+	struct seq_state *this = object;
+	struct spa_pod *param;
+	uint8_t buffer[1024];
+	struct spa_pod_builder b = { 0 };
+	struct props *p;
+	struct spa_result_node_params result;
+	uint32_t count = 0;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(num != 0, -EINVAL);
+
+	p = &this->props;
+
+	result.id = id;
+	result.next = start;
+      next:
+	result.index = result.next++;
+
+	spa_pod_builder_init(&b, buffer, sizeof(buffer));
+
+	switch (id) {
+	case SPA_PARAM_PropInfo:
+		switch (result.index) {
+		case 0:
+			param = spa_pod_builder_add_object(&b,
+				SPA_TYPE_OBJECT_PropInfo, id,
+				SPA_PROP_INFO_id,   SPA_POD_Id(SPA_PROP_device),
+				SPA_PROP_INFO_description, SPA_POD_String("The ALSA device"),
+				SPA_PROP_INFO_type, SPA_POD_Stringn(p->device, sizeof(p->device)));
+			break;
+		default:
+			return 0;
+		}
+		break;
+
+	case SPA_PARAM_Props:
+		switch (result.index) {
+		case 0:
+			param = spa_pod_builder_add_object(&b,
+				SPA_TYPE_OBJECT_Props, id,
+				SPA_PROP_device,      SPA_POD_Stringn(p->device, sizeof(p->device)));
+			break;
+		default:
+			return 0;
+		}
+		break;
+
+	case SPA_PARAM_IO:
+		switch (result.index) {
+		case 0:
+			param = spa_pod_builder_add_object(&b,
+				SPA_TYPE_OBJECT_ParamIO, id,
+				SPA_PARAM_IO_id,   SPA_POD_Id(SPA_IO_Clock),
+				SPA_PARAM_IO_size, SPA_POD_Int(sizeof(struct spa_io_clock)));
+			break;
+		case 1:
+			param = spa_pod_builder_add_object(&b,
+				SPA_TYPE_OBJECT_ParamIO, id,
+				SPA_PARAM_IO_id,   SPA_POD_Id(SPA_IO_Position),
+				SPA_PARAM_IO_size, SPA_POD_Int(sizeof(struct spa_io_position)));
+			break;
+		default:
+			return 0;
+		}
+		break;
+
+	default:
+		return -ENOENT;
+	}
+
+	if (spa_pod_filter(&b, &result.param, param, filter) < 0)
+		goto next;
+
+	spa_node_emit_result(&this->hooks, seq, 0, SPA_RESULT_TYPE_NODE_PARAMS, &result);
+
+	if (++count != num)
+		goto next;
+
+	return 0;
+}
+
+static int impl_node_set_io(void *object, uint32_t id, void *data, size_t size)
+{
+	struct seq_state *this = object;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	switch (id) {
+	case SPA_IO_Clock:
+		this->clock = data;
+		if (this->clock != NULL)
+			spa_scnprintf(this->clock->name, sizeof(this->clock->name),
+					"%s", this->props.clock_name);
+		break;
+	case SPA_IO_Position:
+		this->position = data;
+		break;
+	default:
+		return -ENOENT;
+	}
+	spa_alsa_seq_reassign_follower(this);
+	return 0;
+}
+
+static int impl_node_set_param(void *object, uint32_t id, uint32_t flags,
+			       const struct spa_pod *param)
+{
+	struct seq_state *this = object;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	switch (id) {
+	case SPA_PARAM_Props:
+	{
+		struct props *p = &this->props;
+
+		if (param == NULL) {
+			reset_props(p);
+			return 0;
+		}
+		spa_pod_parse_object(param,
+			SPA_TYPE_OBJECT_Props, NULL,
+			SPA_PROP_device,     SPA_POD_OPT_Stringn(p->device, sizeof(p->device)));
+		break;
+	}
+	default:
+		return -ENOENT;
+	}
+
+	return 0;
+}
+
+static int impl_node_send_command(void *object, const struct spa_command *command)
+{
+	struct seq_state *this = object;
+	int res;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(command != NULL, -EINVAL);
+
+	switch (SPA_NODE_COMMAND_ID(command)) {
+	case SPA_NODE_COMMAND_Start:
+		if ((res = spa_alsa_seq_start(this)) < 0)
+			return res;
+		break;
+	case SPA_NODE_COMMAND_Pause:
+	case SPA_NODE_COMMAND_Suspend:
+		if ((res = spa_alsa_seq_pause(this)) < 0)
+			return res;
+		break;
+	default:
+		return -ENOTSUP;
+	}
+	return 0;
+}
+
+static const struct spa_dict_item node_info_items[] = {
+	{ SPA_KEY_DEVICE_API, "alsa" },
+	{ SPA_KEY_MEDIA_CLASS, "Midi/Bridge" },
+	{ SPA_KEY_NODE_DRIVER, "true" },
+};
+
+static void emit_node_info(struct seq_state *this, bool full)
+{
+	uint64_t old = full ? this->info.change_mask : 0;
+	if (full)
+		this->info.change_mask = this->info_all;
+	if (this->info.change_mask) {
+		this->info.props = &SPA_DICT_INIT_ARRAY(node_info_items);
+		spa_node_emit_info(&this->hooks, &this->info);
+		this->info.change_mask = old;
+	}
+}
+
+static inline void clean_name(char *name)
+{
+	char *c;
+	for (c = name; *c; ++c) {
+		if (!isalnum(*c) && strchr(" /_:()[]", *c) == NULL)
+			*c = '-';
+	}
+}
+
+static void emit_port_info(struct seq_state *this, struct seq_port *port, bool full)
+{
+	uint64_t old = full ? port->info.change_mask : 0;
+	if (full)
+		port->info.change_mask = port->info_all;
+	if (port->info.change_mask) {
+		struct spa_dict_item items[5];
+		uint32_t n_items = 0;
+		int id;
+		snd_seq_port_info_t *info;
+		snd_seq_client_info_t *client_info;
+		char card[8];
+		char name[256];
+		char path[128];
+		char alias[128];
+
+		snd_seq_port_info_alloca(&info);
+		snd_seq_get_any_port_info(this->sys.hndl,
+				port->addr.client, port->addr.port, info);
+
+		snd_seq_client_info_alloca(&client_info);
+		snd_seq_get_any_client_info(this->sys.hndl,
+				port->addr.client, client_info);
+
+		int card_id;
+
+		// Failed to obtain card number (software device) or disabled
+		if (this->props.disable_longname || (card_id = snd_seq_client_info_get_card(client_info)) < 0) {
+			snprintf(name, sizeof(name), "%s:(%s_%d) %s",
+					snd_seq_client_info_get_name(client_info),
+					port->direction == SPA_DIRECTION_OUTPUT ? "capture" : "playback",
+					port->addr.port,
+					snd_seq_port_info_get_name(info));
+		} else {
+			char *longname;
+			if (snd_card_get_longname(card_id, &longname) == 0) {
+				snprintf(name, sizeof(name), "%s:(%s_%d) %s",
+						longname,
+						port->direction == SPA_DIRECTION_OUTPUT ? "capture" : "playback",
+						port->addr.port,
+						snd_seq_port_info_get_name(info));
+				free(longname);
+			} else {
+				// At least add card number to be distinct
+				snprintf(name, sizeof(name), "%s %d:(%s_%d) %s",
+						snd_seq_client_info_get_name(client_info),
+						card_id,
+						port->direction == SPA_DIRECTION_OUTPUT ? "capture" : "playback",
+						port->addr.port,
+						snd_seq_port_info_get_name(info));
+			}
+		}
+		clean_name(name);
+
+		snprintf(path, sizeof(path), "alsa:seq:%s:client_%d:%s_%d",
+				this->props.device,
+				port->addr.client,
+				port->direction == SPA_DIRECTION_OUTPUT ? "capture" : "playback",
+				port->addr.port);
+		clean_name(path);
+
+		snprintf(alias, sizeof(alias), "%s:%s",
+				snd_seq_client_info_get_name(client_info),
+				snd_seq_port_info_get_name(info));
+		clean_name(alias);
+
+		items[n_items++] = SPA_DICT_ITEM_INIT(SPA_KEY_FORMAT_DSP, "8 bit raw midi");
+		items[n_items++] = SPA_DICT_ITEM_INIT(SPA_KEY_OBJECT_PATH, path);
+		items[n_items++] = SPA_DICT_ITEM_INIT(SPA_KEY_PORT_NAME, name);
+		items[n_items++] = SPA_DICT_ITEM_INIT(SPA_KEY_PORT_ALIAS, alias);
+		if ((id = snd_seq_client_info_get_card(client_info)) != -1) {
+			snprintf(card, sizeof(card), "%d", id);
+			items[n_items++] = SPA_DICT_ITEM_INIT(SPA_KEY_API_ALSA_CARD, card);
+		}
+		port->info.props = &SPA_DICT_INIT(items, n_items);
+
+		spa_node_emit_port_info(&this->hooks,
+				port->direction, port->id, &port->info);
+		port->info.change_mask = old;
+	}
+}
+
+static void emit_stream_info(struct seq_state *this, struct seq_stream *stream, bool full)
+{
+	uint32_t i;
+
+	for (i = 0; i < MAX_PORTS; i++) {
+		struct seq_port *port = &stream->ports[i];
+		if (port->valid)
+			emit_port_info(this, port, full);
+	}
+}
+
+static int
+impl_node_add_listener(void *object,
+		struct spa_hook *listener,
+		const struct spa_node_events *events,
+		void *data)
+{
+	struct seq_state *this = object;
+	struct spa_hook_list save;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	spa_hook_list_isolate(&this->hooks, &save, listener, events, data);
+
+	emit_node_info(this, true);
+	emit_stream_info(this, &this->streams[SPA_DIRECTION_INPUT], true);
+	emit_stream_info(this, &this->streams[SPA_DIRECTION_OUTPUT], true);
+
+	spa_hook_list_join(&this->hooks, &save);
+
+	return 0;
+}
+
+static int
+impl_node_set_callbacks(void *object,
+			const struct spa_node_callbacks *callbacks,
+			void *data)
+{
+	struct seq_state *this = object;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	this->callbacks = SPA_CALLBACKS_INIT(callbacks, data);
+
+	return 0;
+}
+
+static int impl_node_sync(void *object, int seq)
+{
+	struct seq_state *this = object;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	spa_node_emit_result(&this->hooks, seq, 0, 0, NULL);
+
+	return 0;
+}
+
+static struct seq_port *find_port(struct seq_state *state,
+		struct seq_stream *stream, const snd_seq_addr_t *addr)
+{
+	uint32_t i;
+	for (i = 0; i < stream->last_port; i++) {
+		struct seq_port *port = &stream->ports[i];
+		if (port->valid &&
+		    port->addr.client == addr->client &&
+		    port->addr.port == addr->port)
+			return port;
+	}
+	return NULL;
+}
+
+static struct seq_port *alloc_port(struct seq_state *state, struct seq_stream *stream)
+{
+	uint32_t i;
+	for (i = 0; i < MAX_PORTS; i++) {
+		struct seq_port *port = &stream->ports[i];
+		if (!port->valid) {
+			port->id = i;
+			port->direction = stream->direction;
+			port->valid = true;
+			if (stream->last_port < i + 1)
+				stream->last_port = i + 1;
+			return port;
+		}
+	}
+	return NULL;
+}
+
+static void free_port(struct seq_state *state, struct seq_stream *stream, struct seq_port *port)
+{
+	port->valid = false;
+
+	if (port->id + 1 == stream->last_port) {
+		int i;
+		for (i = stream->last_port - 1; i >= 0; i--)
+			if (stream->ports[i].valid)
+				break;
+		stream->last_port = i + 1;
+	}
+
+	spa_node_emit_port_info(&state->hooks,
+			port->direction, port->id, NULL);
+	spa_zero(*port);
+}
+
+static void init_port(struct seq_state *state, struct seq_port *port, const snd_seq_addr_t *addr,
+		unsigned int type)
+{
+	enum spa_direction reverse = SPA_DIRECTION_REVERSE(port->direction);
+
+	port->addr = *addr;
+	port->info_all = SPA_PORT_CHANGE_MASK_FLAGS |
+			SPA_PORT_CHANGE_MASK_PROPS |
+			SPA_PORT_CHANGE_MASK_PARAMS;
+	port->info = SPA_PORT_INFO_INIT();
+	port->info.flags = SPA_PORT_FLAG_LIVE;
+	if (type & (SND_SEQ_PORT_TYPE_HARDWARE|SND_SEQ_PORT_TYPE_PORT|SND_SEQ_PORT_TYPE_SPECIFIC))
+		port->info.flags |= SPA_PORT_FLAG_PHYSICAL | SPA_PORT_FLAG_TERMINAL;
+	port->params[PORT_EnumFormat] = SPA_PARAM_INFO(SPA_PARAM_EnumFormat, SPA_PARAM_INFO_READ);
+	port->params[PORT_Meta] = SPA_PARAM_INFO(SPA_PARAM_Meta, SPA_PARAM_INFO_READ);
+	port->params[PORT_IO] = SPA_PARAM_INFO(SPA_PARAM_IO, SPA_PARAM_INFO_READ);
+	port->params[PORT_Format] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
+	port->params[PORT_Buffers] = SPA_PARAM_INFO(SPA_PARAM_Buffers, 0);
+	port->params[PORT_Latency] = SPA_PARAM_INFO(SPA_PARAM_Latency, SPA_PARAM_INFO_READWRITE);
+	port->info.params = port->params;
+	port->info.n_params = N_PORT_PARAMS;
+
+	spa_list_init(&port->free);
+	spa_list_init(&port->ready);
+
+	port->latency[port->direction] = SPA_LATENCY_INFO(
+			port->direction,
+			.min_quantum = 1.0f,
+			.max_quantum = 1.0f);
+	port->latency[reverse] = SPA_LATENCY_INFO(reverse);
+
+	spa_alsa_seq_activate_port(state, port, true);
+
+	emit_port_info(state, port, true);
+}
+
+static void update_stream_port(struct seq_state *state, struct seq_stream *stream,
+		const snd_seq_addr_t *addr, unsigned int caps, const snd_seq_port_info_t *info)
+{
+	struct seq_port *port = find_port(state, stream, addr);
+
+	if (info == NULL) {
+		spa_log_debug(state->log, "free port %d.%d", addr->client, addr->port);
+		if (port)
+			free_port(state, stream, port);
+	} else {
+		if (port == NULL && (caps & stream->caps) == stream->caps) {
+			spa_log_debug(state->log, "new port %d.%d", addr->client, addr->port);
+			port = alloc_port(state, stream);
+			if (port == NULL)
+				return;
+			init_port(state, port, addr, snd_seq_port_info_get_type(info));
+		} else if (port != NULL) {
+			if ((caps & stream->caps) != stream->caps) {
+				spa_log_debug(state->log, "free port %d.%d", addr->client, addr->port);
+				free_port(state, stream, port);
+			}
+			else {
+				spa_log_debug(state->log, "update port %d.%d", addr->client, addr->port);
+				port->info.change_mask = SPA_PORT_CHANGE_MASK_PROPS;
+				emit_port_info(state, port, false);
+			}
+		}
+	}
+}
+
+static int on_port_info(void *data, const snd_seq_addr_t *addr, const snd_seq_port_info_t *info)
+{
+	struct seq_state *state = data;
+
+	if (info == NULL) {
+		update_stream_port(state, &state->streams[SPA_DIRECTION_INPUT], addr, 0, info);
+		update_stream_port(state, &state->streams[SPA_DIRECTION_OUTPUT], addr, 0, info);
+	} else {
+		unsigned int caps = snd_seq_port_info_get_capability(info);
+
+		if (caps & SND_SEQ_PORT_CAP_NO_EXPORT)
+			return 0;
+
+		update_stream_port(state, &state->streams[SPA_DIRECTION_INPUT], addr, caps, info);
+		update_stream_port(state, &state->streams[SPA_DIRECTION_OUTPUT], addr, caps, info);
+	}
+	return 0;
+}
+
+static int impl_node_add_port(void *object, enum spa_direction direction, uint32_t port_id,
+		const struct spa_dict *props)
+{
+	return -ENOTSUP;
+}
+
+static int impl_node_remove_port(void *object, enum spa_direction direction, uint32_t port_id)
+{
+	return -ENOTSUP;
+}
+
+static int
+impl_node_port_enum_params(void *object, int seq,
+			   enum spa_direction direction, uint32_t port_id,
+			   uint32_t id, uint32_t start, uint32_t num,
+			   const struct spa_pod *filter)
+{
+	struct seq_state *this = object;
+	struct seq_port *port;
+	struct spa_pod *param;
+	struct spa_pod_builder b = { 0 };
+	uint8_t buffer[1024];
+	struct spa_result_node_params result;
+	uint32_t count = 0;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(num != 0, -EINVAL);
+
+	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+
+	port = GET_PORT(this, direction, port_id);
+
+	result.id = id;
+	result.next = start;
+      next:
+	result.index = result.next++;
+
+	spa_pod_builder_init(&b, buffer, sizeof(buffer));
+
+	switch (id) {
+	case SPA_PARAM_EnumFormat:
+		if (result.index > 0)
+			return 0;
+		param = spa_pod_builder_add_object(&b,
+			SPA_TYPE_OBJECT_Format, SPA_PARAM_EnumFormat,
+			SPA_FORMAT_mediaType,      SPA_POD_Id(SPA_MEDIA_TYPE_application),
+			SPA_FORMAT_mediaSubtype,   SPA_POD_Id(SPA_MEDIA_SUBTYPE_control));
+		break;
+
+	case SPA_PARAM_Format:
+		if (!port->have_format)
+			return -EIO;
+		if (result.index > 0)
+			return 0;
+		param = spa_pod_builder_add_object(&b,
+			SPA_TYPE_OBJECT_Format, SPA_PARAM_Format,
+			SPA_FORMAT_mediaType,      SPA_POD_Id(SPA_MEDIA_TYPE_application),
+			SPA_FORMAT_mediaSubtype,   SPA_POD_Id(SPA_MEDIA_SUBTYPE_control));
+		break;
+
+	case SPA_PARAM_Buffers:
+		if (!port->have_format)
+			return -EIO;
+		if (result.index > 0)
+			return 0;
+
+		param = spa_pod_builder_add_object(&b,
+			SPA_TYPE_OBJECT_ParamBuffers, id,
+			SPA_PARAM_BUFFERS_buffers, SPA_POD_CHOICE_RANGE_Int(2, 1, MAX_BUFFERS),
+			SPA_PARAM_BUFFERS_blocks,  SPA_POD_Int(1),
+			SPA_PARAM_BUFFERS_size,    SPA_POD_CHOICE_RANGE_Int(
+							4096, 4096, INT32_MAX),
+			SPA_PARAM_BUFFERS_stride,  SPA_POD_Int(1));
+		break;
+
+	case SPA_PARAM_Meta:
+		switch (result.index) {
+		case 0:
+			param = spa_pod_builder_add_object(&b,
+				SPA_TYPE_OBJECT_ParamMeta, id,
+				SPA_PARAM_META_type, SPA_POD_Id(SPA_META_Header),
+				SPA_PARAM_META_size, SPA_POD_Int(sizeof(struct spa_meta_header)));
+			break;
+		default:
+			return 0;
+		}
+		break;
+
+	case SPA_PARAM_IO:
+		switch (result.index) {
+		case 0:
+			param = spa_pod_builder_add_object(&b,
+				SPA_TYPE_OBJECT_ParamIO, id,
+				SPA_PARAM_IO_id,   SPA_POD_Id(SPA_IO_Buffers),
+				SPA_PARAM_IO_size, SPA_POD_Int(sizeof(struct spa_io_buffers)));
+			break;
+		default:
+			return 0;
+		}
+		break;
+
+	case SPA_PARAM_Latency:
+		switch (result.index) {
+		case 0: case 1:
+			param = spa_latency_build(&b, id, &port->latency[result.index]);
+			break;
+		default:
+			return 0;
+		}
+		break;
+
+	default:
+		return -ENOENT;
+	}
+
+	if (spa_pod_filter(&b, &result.param, param, filter) < 0)
+		goto next;
+
+	spa_node_emit_result(&this->hooks, seq, 0, SPA_RESULT_TYPE_NODE_PARAMS, &result);
+
+	if (++count != num)
+		goto next;
+
+	return 0;
+}
+
+static int clear_buffers(struct seq_state *this, struct seq_port *port)
+{
+	if (port->n_buffers > 0) {
+		spa_list_init(&port->free);
+		spa_list_init(&port->ready);
+		port->n_buffers = 0;
+	}
+	return 0;
+}
+
+static int port_set_format(void *object, struct seq_port *port,
+			   uint32_t flags, const struct spa_pod *format)
+{
+	struct seq_state *this = object;
+	int err;
+
+	if (format == NULL) {
+		if (!port->have_format)
+			return 0;
+
+		clear_buffers(this, port);
+		port->have_format = false;
+	} else {
+		struct spa_audio_info info = { 0 };
+
+		if ((err = spa_format_parse(format, &info.media_type, &info.media_subtype)) < 0)
+			return err;
+
+		if (info.media_type != SPA_MEDIA_TYPE_application ||
+		    info.media_subtype != SPA_MEDIA_SUBTYPE_control)
+			return -EINVAL;
+
+		port->current_format = info;
+		port->have_format = true;
+	}
+
+	port->info.change_mask |= SPA_PORT_CHANGE_MASK_RATE;
+	port->info.rate = SPA_FRACTION(1, 1);
+	port->info.change_mask |= SPA_PORT_CHANGE_MASK_PARAMS;
+	if (port->have_format) {
+		port->params[PORT_Format] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_READWRITE);
+		port->params[PORT_Buffers] = SPA_PARAM_INFO(SPA_PARAM_Buffers, SPA_PARAM_INFO_READ);
+	} else {
+		port->params[PORT_Format] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
+		port->params[PORT_Buffers] = SPA_PARAM_INFO(SPA_PARAM_Buffers, 0);
+	}
+	emit_port_info(this, port, false);
+
+	return 0;
+}
+
+static int
+impl_node_port_set_param(void *object,
+			 enum spa_direction direction, uint32_t port_id,
+			 uint32_t id, uint32_t flags,
+			 const struct spa_pod *param)
+{
+	struct seq_state *this = object;
+	struct seq_port *port;
+	int res;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+
+	port = GET_PORT(this, direction, port_id);
+
+	switch (id) {
+	case SPA_PARAM_Format:
+		res = port_set_format(this, port, flags, param);
+		break;
+	case SPA_PARAM_Latency:
+	{
+		struct spa_latency_info info;
+		if ((res = spa_latency_parse(param, &info)) < 0)
+			return res;
+		if (direction == info.direction)
+			return -EINVAL;
+
+		port->latency[info.direction] = info;
+		port->info.change_mask |= SPA_PORT_CHANGE_MASK_PARAMS;
+		port->params[PORT_Latency].flags ^= SPA_PARAM_INFO_SERIAL;
+		emit_port_info(this, port, false);
+		break;
+	}
+	default:
+		res = -ENOENT;
+		break;
+	}
+	return res;
+}
+
+static int
+impl_node_port_use_buffers(void *object,
+		enum spa_direction direction, uint32_t port_id,
+		uint32_t flags,
+		struct spa_buffer **buffers, uint32_t n_buffers)
+{
+	struct seq_state *this = object;
+	struct seq_port *port;
+	uint32_t i;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+
+	port = GET_PORT(this, direction, port_id);
+
+	spa_log_debug(this->log, "%p: port %d.%d buffers:%d format:%d", this,
+			direction, port_id, n_buffers, port->have_format);
+
+	clear_buffers(this, port);
+
+	if (n_buffers > 0 && !port->have_format)
+		return -EIO;
+	if (n_buffers > MAX_BUFFERS)
+		return -ENOSPC;
+
+	for (i = 0; i < n_buffers; i++) {
+		struct buffer *b = &port->buffers[i];
+		struct spa_data *d = buffers[i]->datas;
+
+		b->buf = buffers[i];
+		b->id = i;
+		b->flags = BUFFER_FLAG_OUT;
+
+		b->h = spa_buffer_find_meta_data(b->buf, SPA_META_Header, sizeof(*b->h));
+
+		if (d[0].data == NULL) {
+			spa_log_error(this->log, "%p: need mapped memory", this);
+			return -EINVAL;
+		}
+		if (direction == SPA_DIRECTION_OUTPUT)
+			spa_alsa_seq_recycle_buffer(this, port, i);
+	}
+	port->n_buffers = n_buffers;
+
+	return 0;
+}
+
+static int
+impl_node_port_set_io(void *object,
+		      enum spa_direction direction,
+		      uint32_t port_id,
+		      uint32_t id,
+		      void *data, size_t size)
+{
+	struct seq_state *this = object;
+	struct seq_port *port;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+
+	port = GET_PORT(this, direction, port_id);
+
+	spa_log_debug(this->log, "%p: io %d.%d %d %p %zd", this,
+			direction, port_id, id, data, size);
+
+	switch (id) {
+	case SPA_IO_Buffers:
+		port->io = data;
+		break;
+	default:
+		return -ENOENT;
+	}
+	return 0;
+}
+
+static int impl_node_port_reuse_buffer(void *object, uint32_t port_id, uint32_t buffer_id)
+{
+	struct seq_state *this = object;
+	struct seq_port *port;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	spa_return_val_if_fail(!CHECK_PORT(this, SPA_DIRECTION_OUTPUT, port_id), -EINVAL);
+
+	port = GET_PORT(this, SPA_DIRECTION_OUTPUT, port_id);
+
+	if (port->n_buffers == 0)
+		return -EIO;
+
+	if (buffer_id >= port->n_buffers)
+		return -EINVAL;
+
+	spa_alsa_seq_recycle_buffer(this, port, buffer_id);
+
+	return 0;
+}
+
+static int impl_node_process(void *object)
+{
+	struct seq_state *this = object;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	return spa_alsa_seq_process(this);
+}
+
+static const struct spa_node_methods impl_node = {
+	SPA_VERSION_NODE_METHODS,
+	.add_listener = impl_node_add_listener,
+	.set_callbacks = impl_node_set_callbacks,
+	.sync = impl_node_sync,
+	.enum_params = impl_node_enum_params,
+	.set_param = impl_node_set_param,
+	.set_io = impl_node_set_io,
+	.send_command = impl_node_send_command,
+	.add_port = impl_node_add_port,
+	.remove_port = impl_node_remove_port,
+	.port_enum_params = impl_node_port_enum_params,
+	.port_set_param = impl_node_port_set_param,
+	.port_use_buffers = impl_node_port_use_buffers,
+	.port_set_io = impl_node_port_set_io,
+	.port_reuse_buffer = impl_node_port_reuse_buffer,
+	.process = impl_node_process,
+};
+
+static int impl_get_interface(struct spa_handle *handle, const char *type, void **interface)
+{
+	struct seq_state *this;
+
+	spa_return_val_if_fail(handle != NULL, -EINVAL);
+	spa_return_val_if_fail(interface != NULL, -EINVAL);
+
+	this = (struct seq_state *) handle;
+
+	if (spa_streq(type, SPA_TYPE_INTERFACE_Node))
+		*interface = &this->node;
+	else
+		return -ENOENT;
+
+	return 0;
+}
+
+static int impl_clear(struct spa_handle *handle)
+{
+	struct seq_state *this;
+
+	spa_return_val_if_fail(handle != NULL, -EINVAL);
+
+	this = (struct seq_state *) handle;
+
+	spa_alsa_seq_close(this);
+	return 0;
+}
+
+static size_t
+impl_get_size(const struct spa_handle_factory *factory,
+	      const struct spa_dict *params)
+{
+	return sizeof(struct seq_state);
+}
+
+static int
+impl_init(const struct spa_handle_factory *factory,
+	  struct spa_handle *handle,
+	  const struct spa_dict *info,
+	  const struct spa_support *support,
+	  uint32_t n_support)
+{
+	struct seq_state *this;
+	uint32_t i;
+	int res;
+
+	spa_return_val_if_fail(factory != NULL, -EINVAL);
+	spa_return_val_if_fail(handle != NULL, -EINVAL);
+
+	handle->get_interface = impl_get_interface;
+	handle->clear = impl_clear;
+
+	this = (struct seq_state *) handle;
+
+	this->log = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_Log);
+	alsa_log_topic_init(this->log);
+
+	this->data_system = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_DataSystem);
+	this->data_loop = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_DataLoop);
+	this->main_loop = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_Loop);
+
+	if (this->data_loop == NULL) {
+		spa_log_error(this->log, "a data loop is needed");
+		return -EINVAL;
+	}
+	if (this->data_system == NULL) {
+		spa_log_error(this->log, "a data system is needed");
+		return -EINVAL;
+	}
+
+	this->node.iface = SPA_INTERFACE_INIT(SPA_TYPE_INTERFACE_Node, SPA_VERSION_NODE, &impl_node, this);
+
+	spa_hook_list_init(&this->hooks);
+
+	this->info_all = SPA_NODE_CHANGE_MASK_FLAGS |
+			SPA_NODE_CHANGE_MASK_PROPS |
+			SPA_NODE_CHANGE_MASK_PARAMS;
+	this->info.max_input_ports = MAX_PORTS;
+	this->info.max_output_ports = MAX_PORTS;
+	this->info.flags = SPA_NODE_FLAG_RT;
+	this->params[NODE_PropInfo] = SPA_PARAM_INFO(SPA_PARAM_PropInfo, SPA_PARAM_INFO_READ);
+	this->params[NODE_Props] = SPA_PARAM_INFO(SPA_PARAM_Props, SPA_PARAM_INFO_READWRITE);
+	this->params[NODE_IO] = SPA_PARAM_INFO(SPA_PARAM_IO, SPA_PARAM_INFO_READ);
+	this->info.params = this->params;
+	this->info.n_params = N_NODE_PARAMS;
+	reset_props(&this->props);
+
+	for (i = 0; info && i < info->n_items; i++) {
+		const char *k = info->items[i].key;
+		const char *s = info->items[i].value;
+		if (spa_streq(k, SPA_KEY_API_ALSA_PATH)) {
+			spa_scnprintf(this->props.device,
+					sizeof(this->props.device), "%s", s);
+		} else if (spa_streq(k, "clock.name")) {
+			spa_scnprintf(this->props.clock_name,
+					sizeof(this->props.clock_name), "%s", s);
+		} else if (spa_streq(k, SPA_KEY_API_ALSA_DISABLE_LONGNAME)) {
+			this->props.disable_longname = spa_atob(s);
+		}
+	}
+
+	this->port_info = on_port_info;
+	this->port_info_data = this;
+
+	if ((res = spa_alsa_seq_open(this)) < 0)
+		return res;
+
+	return 0;
+}
+
+static const struct spa_interface_info impl_interfaces[] = {
+	{SPA_TYPE_INTERFACE_Node,},
+};
+
+static int
+impl_enum_interface_info(const struct spa_handle_factory *factory,
+			 const struct spa_interface_info **info,
+			 uint32_t *index)
+{
+	spa_return_val_if_fail(factory != NULL, -EINVAL);
+	spa_return_val_if_fail(info != NULL, -EINVAL);
+	spa_return_val_if_fail(index != NULL, -EINVAL);
+
+	if (*index >= SPA_N_ELEMENTS(impl_interfaces))
+		return 0;
+
+	*info = &impl_interfaces[(*index)++];
+
+	return 1;
+}
+
+static const struct spa_dict_item info_items[] = {
+	{ SPA_KEY_FACTORY_AUTHOR, "Wim Taymans <wim.taymans@gmail.com>" },
+	{ SPA_KEY_FACTORY_DESCRIPTION, "Bridge midi ports with the alsa sequencer API" },
+	{ SPA_KEY_FACTORY_USAGE, "["SPA_KEY_API_ALSA_PATH"=<device>]" },
+};
+
+static const struct spa_dict info = SPA_DICT_INIT_ARRAY(info_items);
+
+const struct spa_handle_factory spa_alsa_seq_bridge_factory = {
+	SPA_VERSION_HANDLE_FACTORY,
+	SPA_NAME_API_ALSA_SEQ_BRIDGE,
+	&info,
+	impl_get_size,
+	impl_init,
+	impl_enum_interface_info,
+};