Adding upstream version 0.3.65.upstream/0.3.65upstream

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

1 files changed, 1592 insertions, 0 deletions

diff --git a/spa/plugins/bluez5/sco-source.c b/spa/plugins/bluez5/sco-source.c
new file mode 100644
index 0000000..6f5fe08
--- /dev/null
+++ b/spa/plugins/bluez5/sco-source.c
@@ -0,0 +1,1592 @@
+/* Spa SCO Source
+ *
+ * Copyright © 2019 Collabora Ltd.
+ *
+ * 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 <unistd.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <time.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#include <spa/support/plugin.h>
+#include <spa/support/loop.h>
+#include <spa/support/log.h>
+#include <spa/support/system.h>
+#include <spa/utils/result.h>
+#include <spa/utils/list.h>
+#include <spa/utils/keys.h>
+#include <spa/utils/names.h>
+#include <spa/utils/string.h>
+#include <spa/monitor/device.h>
+
+#include <spa/node/node.h>
+#include <spa/node/utils.h>
+#include <spa/node/io.h>
+#include <spa/node/keys.h>
+#include <spa/param/param.h>
+#include <spa/param/latency-utils.h>
+#include <spa/param/audio/format.h>
+#include <spa/param/audio/format-utils.h>
+#include <spa/pod/filter.h>
+
+#include <sbc/sbc.h>
+
+#include "defs.h"
+
+static struct spa_log_topic log_topic = SPA_LOG_TOPIC(0, "spa.bluez5.source.sco");
+#undef SPA_LOG_TOPIC_DEFAULT
+#define SPA_LOG_TOPIC_DEFAULT &log_topic
+
+#include "decode-buffer.h"
+
+#define DEFAULT_CLOCK_NAME	"clock.system.monotonic"
+
+struct props {
+	char clock_name[64];
+};
+
+#define MAX_BUFFERS 32
+
+struct buffer {
+	uint32_t id;
+	unsigned int outstanding:1;
+	struct spa_buffer *buf;
+	struct spa_meta_header *h;
+	struct spa_list link;
+};
+
+struct port {
+	struct spa_audio_info current_format;
+	int frame_size;
+	unsigned int have_format:1;
+
+	uint64_t info_all;
+	struct spa_port_info info;
+	struct spa_io_buffers *io;
+	struct spa_io_rate_match *rate_match;
+	struct spa_latency_info latency;
+#define IDX_EnumFormat	0
+#define IDX_Meta	1
+#define IDX_IO		2
+#define IDX_Format	3
+#define IDX_Buffers	4
+#define IDX_Latency	5
+#define N_PORT_PARAMS	6
+	struct spa_param_info params[N_PORT_PARAMS];
+
+	struct buffer buffers[MAX_BUFFERS];
+	uint32_t n_buffers;
+
+	struct spa_list free;
+	struct spa_list ready;
+
+	struct spa_bt_decode_buffer buffer;
+};
+
+struct impl {
+	struct spa_handle handle;
+	struct spa_node node;
+
+	struct spa_log *log;
+	struct spa_loop *data_loop;
+	struct spa_system *data_system;
+
+	struct spa_hook_list hooks;
+	struct spa_callbacks callbacks;
+
+	uint32_t quantum_limit;
+
+	uint64_t info_all;
+	struct spa_node_info info;
+#define IDX_PropInfo	0
+#define IDX_Props	1
+#define IDX_NODE_IO	2
+#define N_NODE_PARAMS	3
+	struct spa_param_info params[N_NODE_PARAMS];
+	struct props props;
+
+	struct spa_bt_transport *transport;
+	struct spa_hook transport_listener;
+
+	struct port port;
+
+	unsigned int started:1;
+	unsigned int following:1;
+	unsigned int matching:1;
+	unsigned int resampling:1;
+
+	struct spa_source timer_source;
+	int timerfd;
+
+	struct spa_io_clock *clock;
+	struct spa_io_position *position;
+
+	uint64_t current_time;
+	uint64_t next_time;
+
+	/* mSBC */
+	sbc_t msbc;
+	bool msbc_seq_initialized;
+	uint8_t msbc_seq;
+
+	/* mSBC frame parsing */
+	uint8_t msbc_buffer[MSBC_ENCODED_SIZE];
+	uint8_t msbc_buffer_pos;
+
+	struct timespec now;
+};
+
+#define CHECK_PORT(this,d,p)	((d) == SPA_DIRECTION_OUTPUT && (p) == 0)
+
+static void reset_props(struct props *props)
+{
+	strncpy(props->clock_name, DEFAULT_CLOCK_NAME, sizeof(props->clock_name));
+}
+
+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 impl *this = object;
+	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);
+
+	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) {
+		default:
+			return 0;
+		}
+		break;
+	}
+	case SPA_PARAM_Props:
+	{
+		switch (result.index) {
+		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 set_timeout(struct impl *this, uint64_t time)
+{
+       struct itimerspec ts;
+       ts.it_value.tv_sec = time / SPA_NSEC_PER_SEC;
+       ts.it_value.tv_nsec = time % SPA_NSEC_PER_SEC;
+       ts.it_interval.tv_sec = 0;
+       ts.it_interval.tv_nsec = 0;
+       return spa_system_timerfd_settime(this->data_system,
+		       this->timerfd, SPA_FD_TIMER_ABSTIME, &ts, NULL);
+}
+
+static int set_timers(struct impl *this)
+{
+       struct timespec now;
+
+       spa_system_clock_gettime(this->data_system, CLOCK_MONOTONIC, &now);
+       this->next_time = SPA_TIMESPEC_TO_NSEC(&now);
+
+       return set_timeout(this, this->following ? 0 : this->next_time);
+}
+
+static int do_reassign_follower(struct spa_loop *loop,
+			bool async,
+			uint32_t seq,
+			const void *data,
+			size_t size,
+			void *user_data)
+{
+	struct impl *this = user_data;
+	struct port *port = &this->port;
+
+	set_timers(this);
+	spa_bt_decode_buffer_recover(&port->buffer);
+	return 0;
+}
+
+static inline bool is_following(struct impl *this)
+{
+	return this->position && this->clock && this->position->clock.id != this->clock->id;
+}
+
+static int impl_node_set_io(void *object, uint32_t id, void *data, size_t size)
+{
+	struct impl *this = object;
+	bool following;
+
+	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;
+	}
+
+	following = is_following(this);
+	if (this->started && following != this->following) {
+		spa_log_debug(this->log, "%p: reassign follower %d->%d", this, this->following, following);
+		this->following = following;
+		spa_loop_invoke(this->data_loop, do_reassign_follower, 0, NULL, 0, true, this);
+	}
+
+	return 0;
+}
+
+static void emit_node_info(struct impl *this, bool full);
+
+static int apply_props(struct impl *this, const struct spa_pod *param)
+{
+	struct props new_props = this->props;
+	int changed = 0;
+
+	if (param == NULL) {
+		reset_props(&new_props);
+	} else {
+		/* noop */
+	}
+
+	changed = (memcmp(&new_props, &this->props, sizeof(struct props)) != 0);
+	this->props = new_props;
+	return changed;
+}
+
+static int impl_node_set_param(void *object, uint32_t id, uint32_t flags,
+			       const struct spa_pod *param)
+{
+	struct impl *this = object;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	switch (id) {
+	case SPA_PARAM_Props:
+	{
+		if (apply_props(this, param) > 0) {
+			this->info.change_mask |= SPA_NODE_CHANGE_MASK_PARAMS;
+			this->params[IDX_Props].flags ^= SPA_PARAM_INFO_SERIAL;
+			emit_node_info(this, false);
+		}
+		break;
+	}
+	default:
+		return -ENOENT;
+	}
+
+	return 0;
+}
+
+static void reset_buffers(struct port *port)
+{
+	uint32_t i;
+
+	spa_list_init(&port->free);
+	spa_list_init(&port->ready);
+
+	for (i = 0; i < port->n_buffers; i++) {
+		struct buffer *b = &port->buffers[i];
+		spa_list_append(&port->free, &b->link);
+		b->outstanding = false;
+	}
+}
+
+static void recycle_buffer(struct impl *this, struct port *port, uint32_t buffer_id)
+{
+	struct buffer *b = &port->buffers[buffer_id];
+
+	if (b->outstanding) {
+		spa_log_trace(this->log, "%p: recycle buffer %u", this, buffer_id);
+		spa_list_append(&port->free, &b->link);
+		b->outstanding = false;
+	}
+}
+
+/* Append data to msbc buffer, syncing buffer start to frame headers */
+static void msbc_buffer_append_byte(struct impl *this, uint8_t byte)
+{
+        /* Parse mSBC frame header */
+        if (this->msbc_buffer_pos == 0) {
+                if (byte != 0x01) {
+                        this->msbc_buffer_pos = 0;
+                        return;
+                }
+        }
+        else if (this->msbc_buffer_pos == 1) {
+                if (!((byte & 0x0F) == 0x08 &&
+                      ((byte >> 4) & 1) == ((byte >> 5) & 1) &&
+                      ((byte >> 6) & 1) == ((byte >> 7) & 1))) {
+                        this->msbc_buffer_pos = 0;
+                        return;
+                }
+        }
+        else if (this->msbc_buffer_pos == 2) {
+                /* .. and beginning of MSBC frame: SYNCWORD + 2 nul bytes */
+                if (byte != 0xAD) {
+                        this->msbc_buffer_pos = 0;
+                        return;
+                }
+        }
+        else if (this->msbc_buffer_pos == 3) {
+                if (byte != 0x00) {
+                        this->msbc_buffer_pos = 0;
+                        return;
+                }
+        }
+        else if (this->msbc_buffer_pos == 4) {
+                if (byte != 0x00) {
+                        this->msbc_buffer_pos = 0;
+                        return;
+                }
+        }
+        else if (this->msbc_buffer_pos >= MSBC_ENCODED_SIZE) {
+                /* Packet completed. Reset. */
+                this->msbc_buffer_pos = 0;
+                msbc_buffer_append_byte(this, byte);
+                return;
+        }
+        this->msbc_buffer[this->msbc_buffer_pos] = byte;
+        ++this->msbc_buffer_pos;
+}
+
+/* Helper function for debugging */
+static SPA_UNUSED void hexdump_to_log(struct impl *this, uint8_t *data, size_t size)
+{
+	char buf[2048];
+	size_t i, col = 0, pos = 0;
+	buf[0] = '\0';
+	for (i = 0; i < size; ++i) {
+		int res;
+		res = spa_scnprintf(buf + pos, sizeof(buf) - pos, "%s%02x",
+				(col == 0) ? "\n\t" : " ", data[i]);
+		if (res < 0)
+			break;
+		pos += res;
+		col = (col + 1) % 16;
+	}
+	spa_log_trace(this->log, "hexdump (%d bytes):%s", (int)size, buf);
+}
+
+/* helper function to detect if a packet consists only of zeros */
+static bool is_zero_packet(uint8_t *data, int size)
+{
+	for (int i = 0; i < size; ++i) {
+		if (data[i] != 0) {
+			return false;
+		}
+	}
+	return true;
+}
+
+static uint32_t preprocess_and_decode_msbc_data(void *userdata, uint8_t *read_data, int size_read)
+{
+	struct impl *this = userdata;
+	struct port *port = &this->port;
+	uint32_t decoded = 0;
+	int i;
+
+	spa_log_trace(this->log, "handling mSBC data");
+
+	/*
+	 * Check if the packet contains only zeros - if so ignore the packet.
+	 * This is necessary, because some kernels insert bogus "all-zero" packets
+	 * into the datastream.
+	 * See https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/549
+	 */
+	if (is_zero_packet(read_data, size_read))
+		return 0;
+
+	for (i = 0; i < size_read; ++i) {
+		void *buf;
+		uint32_t avail;
+		int seq, processed;
+		size_t written;
+
+		msbc_buffer_append_byte(this, read_data[i]);
+
+		if (this->msbc_buffer_pos != MSBC_ENCODED_SIZE)
+			continue;
+
+		/*
+		 * Handle found mSBC packet
+		 */
+
+		buf = spa_bt_decode_buffer_get_write(&port->buffer, &avail);
+
+		/* Check sequence number */
+		seq = ((this->msbc_buffer[1] >> 4) & 1) |
+			((this->msbc_buffer[1] >> 6) & 2);
+
+		spa_log_trace(this->log, "mSBC packet seq=%u", seq);
+		if (!this->msbc_seq_initialized) {
+			this->msbc_seq_initialized = true;
+			this->msbc_seq = seq;
+		} else if (seq != this->msbc_seq) {
+			/* TODO: PLC (too late to insert data now) */
+			spa_log_info(this->log,
+					"missing mSBC packet: %u != %u", seq, this->msbc_seq);
+			this->msbc_seq = seq;
+		}
+
+		this->msbc_seq = (this->msbc_seq + 1) % 4;
+
+		if (avail < MSBC_DECODED_SIZE)
+			spa_log_warn(this->log, "Output buffer full, dropping msbc data");
+
+		/* decode frame */
+		processed = sbc_decode(
+			&this->msbc, this->msbc_buffer + 2, MSBC_ENCODED_SIZE - 3,
+					buf, avail, &written);
+
+		if (processed < 0) {
+			spa_log_warn(this->log, "sbc_decode failed: %d", processed);
+			/* TODO: manage errors */
+			continue;
+		}
+
+		spa_bt_decode_buffer_write_packet(&port->buffer, written);
+		decoded += written;
+	}
+
+	return decoded;
+}
+
+static int sco_source_cb(void *userdata, uint8_t *read_data, int size_read)
+{
+	struct impl *this = userdata;
+	struct port *port = &this->port;
+	uint32_t decoded;
+	uint64_t dt;
+
+	if (this->transport == NULL) {
+		spa_log_debug(this->log, "no transport, stop reading");
+		goto stop;
+	}
+
+	/* update the current pts */
+	dt = SPA_TIMESPEC_TO_NSEC(&this->now);
+	spa_system_clock_gettime(this->data_system, CLOCK_MONOTONIC, &this->now);
+	dt = SPA_TIMESPEC_TO_NSEC(&this->now) - dt;
+
+	/* handle data read from socket */
+#if 0
+	hexdump_to_log(this, read_data, size_read);
+#endif
+
+	if (this->transport->codec == HFP_AUDIO_CODEC_MSBC) {
+		decoded = preprocess_and_decode_msbc_data(userdata, read_data, size_read);
+	} else {
+		uint32_t avail;
+		uint8_t *packet;
+
+		if (size_read != 48 && is_zero_packet(read_data, size_read)) {
+			/* Adapter is returning non-standard CVSD stream. For example
+			 * Intel 8087:0029 at Firmware revision 0.0 build 191 week 21 2021
+			 * on kernel 5.13.19 produces such data.
+			 */
+			return 0;
+		}
+
+		if (size_read % port->frame_size != 0) {
+			/* Unaligned data: reception or adapter problem.
+			 * Consider the whole packet lost and report.
+			 */
+			spa_log_debug(this->log,
+					"received bad Bluetooth SCO CVSD packet");
+			return 0;
+		}
+
+		packet = spa_bt_decode_buffer_get_write(&port->buffer, &avail);
+		avail = SPA_MIN(avail, (uint32_t)size_read);
+		spa_memmove(packet, read_data, avail);
+		spa_bt_decode_buffer_write_packet(&port->buffer, avail);
+
+		decoded = avail;
+	}
+
+	spa_log_trace(this->log, "read socket data size:%d decoded frames:%d dt:%d dms",
+			size_read, decoded / port->frame_size,
+			(int)(dt / 100000));
+
+	return 0;
+
+stop:
+	return 1;
+}
+
+static int setup_matching(struct impl *this)
+{
+	struct port *port = &this->port;
+
+	if (this->position && port->rate_match) {
+		port->rate_match->rate = 1 / port->buffer.corr;
+
+		this->matching = this->following;
+		this->resampling = this->matching ||
+			(port->current_format.info.raw.rate != this->position->clock.rate.denom);
+	} else {
+		this->matching = false;
+		this->resampling = false;
+	}
+
+	if (port->rate_match)
+		SPA_FLAG_UPDATE(port->rate_match->flags, SPA_IO_RATE_MATCH_FLAG_ACTIVE, this->matching);
+
+	return 0;
+}
+
+static int produce_buffer(struct impl *this);
+
+static void sco_on_timeout(struct spa_source *source)
+{
+	struct impl *this = source->data;
+	struct port *port = &this->port;
+	uint64_t exp, duration;
+	uint32_t rate;
+	uint64_t prev_time, now_time;
+	int res;
+
+	if (this->transport == NULL)
+		return;
+
+	if (this->started) {
+		if ((res = spa_system_timerfd_read(this->data_system, this->timerfd, &exp)) < 0) {
+			if (res != -EAGAIN)
+				spa_log_warn(this->log, "error reading timerfd: %s",
+						spa_strerror(res));
+			return;
+		}
+	}
+
+	prev_time = this->current_time;
+	now_time = this->current_time = this->next_time;
+
+	spa_log_trace(this->log, "%p: timer %"PRIu64" %"PRIu64"", this,
+			now_time, now_time - prev_time);
+
+	if (SPA_LIKELY(this->position)) {
+		duration = this->position->clock.duration;
+		rate = this->position->clock.rate.denom;
+	} else {
+		duration = 1024;
+		rate = 48000;
+	}
+
+	setup_matching(this);
+
+	this->next_time = now_time + duration * SPA_NSEC_PER_SEC / port->buffer.corr / rate;
+
+	if (SPA_LIKELY(this->clock)) {
+		this->clock->nsec = now_time;
+		this->clock->position += duration;
+		this->clock->duration = duration;
+		this->clock->rate_diff = port->buffer.corr;
+		this->clock->next_nsec = this->next_time;
+	}
+
+	if (port->io) {
+		int status = produce_buffer(this);
+		spa_log_trace(this->log, "%p: io:%d status:%d", this, port->io->status, status);
+	}
+
+	spa_node_call_ready(&this->callbacks, SPA_STATUS_HAVE_DATA);
+
+	set_timeout(this, this->next_time);
+}
+
+static int do_add_source(struct spa_loop *loop,
+			 bool async,
+			 uint32_t seq,
+			 const void *data,
+			 size_t size,
+			 void *user_data)
+{
+	struct impl *this = user_data;
+
+	spa_bt_sco_io_set_source_cb(this->transport->sco_io, sco_source_cb, this);
+
+	return 0;
+}
+
+static int do_start(struct impl *this)
+{
+	struct port *port = &this->port;
+	bool do_accept;
+	int res;
+
+	/* Don't do anything if the node has already started */
+	if (this->started)
+		return 0;
+
+	this->following = is_following(this);
+
+	spa_log_debug(this->log, "%p: start following:%d",
+			this, this->following);
+
+	/* Make sure the transport is valid */
+	spa_return_val_if_fail (this->transport != NULL, -EIO);
+
+	/* Do accept if Gateway; otherwise do connect for Head Unit */
+	do_accept = this->transport->profile & SPA_BT_PROFILE_HEADSET_AUDIO_GATEWAY;
+
+	/* acquire the socket fd (false -> connect | true -> accept) */
+	if ((res = spa_bt_transport_acquire(this->transport, do_accept)) < 0)
+		return res;
+
+	/* Reset the buffers and sample count */
+	reset_buffers(port);
+
+	spa_bt_decode_buffer_clear(&port->buffer);
+	if ((res = spa_bt_decode_buffer_init(&port->buffer, this->log,
+			port->frame_size, port->current_format.info.raw.rate,
+			this->quantum_limit, this->quantum_limit)) < 0)
+		return res;
+
+	/* Init mSBC if needed */
+	if (this->transport->codec == HFP_AUDIO_CODEC_MSBC) {
+		sbc_init_msbc(&this->msbc, 0);
+		/* Libsbc expects audio samples by default in host endianness, mSBC requires little endian */
+		this->msbc.endian = SBC_LE;
+		this->msbc_seq_initialized = false;
+
+		this->msbc_buffer_pos = 0;
+	}
+
+	/* Start socket i/o */
+	if ((res = spa_bt_transport_ensure_sco_io(this->transport, this->data_loop)) < 0)
+		goto fail;
+	spa_loop_invoke(this->data_loop, do_add_source, 0, NULL, 0, true, this);
+
+	/* Start timer */
+	this->timer_source.data = this;
+	this->timer_source.fd = this->timerfd;
+	this->timer_source.func = sco_on_timeout;
+	this->timer_source.mask = SPA_IO_IN;
+	this->timer_source.rmask = 0;
+	spa_loop_add_source(this->data_loop, &this->timer_source);
+
+	setup_matching(this);
+	set_timers(this);
+
+	/* Set the started flag */
+	this->started = true;
+
+	return 0;
+
+fail:
+	spa_bt_transport_release(this->transport);
+	return res;
+}
+
+static int do_remove_source(struct spa_loop *loop,
+			    bool async,
+			    uint32_t seq,
+			    const void *data,
+			    size_t size,
+			    void *user_data)
+{
+	struct impl *this = user_data;
+	struct itimerspec ts;
+
+	if (this->transport && this->transport->sco_io)
+		spa_bt_sco_io_set_source_cb(this->transport->sco_io, NULL, NULL);
+
+	if (this->timer_source.loop)
+		spa_loop_remove_source(this->data_loop, &this->timer_source);
+	ts.it_value.tv_sec = 0;
+	ts.it_value.tv_nsec = 0;
+	ts.it_interval.tv_sec = 0;
+	ts.it_interval.tv_nsec = 0;
+	spa_system_timerfd_settime(this->data_system, this->timerfd, 0, &ts, NULL);
+
+	return 0;
+}
+
+static int do_stop(struct impl *this)
+{
+	struct port *port = &this->port;
+	int res = 0;
+
+	if (!this->started)
+		return 0;
+
+	spa_log_debug(this->log, "sco-source %p: stop", this);
+
+	spa_loop_invoke(this->data_loop, do_remove_source, 0, NULL, 0, true, this);
+
+	this->started = false;
+
+	if (this->transport) {
+		/* Release the transport; it is responsible for closing the fd */
+		res = spa_bt_transport_release(this->transport);
+	}
+
+	spa_bt_decode_buffer_clear(&port->buffer);
+
+	return res;
+}
+
+static int impl_node_send_command(void *object, const struct spa_command *command)
+{
+	struct impl *this = object;
+	struct port *port;
+	int res;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(command != NULL, -EINVAL);
+
+	port = &this->port;
+
+	switch (SPA_NODE_COMMAND_ID(command)) {
+	case SPA_NODE_COMMAND_Start:
+		if (!port->have_format)
+			return -EIO;
+		if (port->n_buffers == 0)
+			return -EIO;
+
+		if ((res = do_start(this)) < 0)
+			return res;
+		break;
+	case SPA_NODE_COMMAND_Pause:
+	case SPA_NODE_COMMAND_Suspend:
+		if ((res = do_stop(this)) < 0)
+			return res;
+		break;
+	default:
+		return -ENOTSUP;
+	}
+	return 0;
+}
+
+static void emit_node_info(struct impl *this, bool full)
+{
+	static const struct spa_dict_item hu_node_info_items[] = {
+		{ SPA_KEY_DEVICE_API, "bluez5" },
+		{ SPA_KEY_MEDIA_CLASS, "Audio/Source" },
+		{ SPA_KEY_NODE_DRIVER, "true" },
+	};
+	const struct spa_dict_item ag_node_info_items[] = {
+		{ SPA_KEY_DEVICE_API, "bluez5" },
+		{ SPA_KEY_MEDIA_CLASS, "Stream/Output/Audio" },
+		{ "media.name", ((this->transport && this->transport->device->name) ?
+					this->transport->device->name : "HSP/HFP") },
+		{ SPA_KEY_MEDIA_ROLE, "Communication" },
+	};
+	bool is_ag = this->transport && (this->transport->profile & SPA_BT_PROFILE_HEADSET_AUDIO_GATEWAY);
+	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 = is_ag ?
+			&SPA_DICT_INIT_ARRAY(ag_node_info_items) :
+			&SPA_DICT_INIT_ARRAY(hu_node_info_items);
+		spa_node_emit_info(&this->hooks, &this->info);
+		this->info.change_mask = old;
+	}
+}
+
+static void emit_port_info(struct impl *this, struct 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) {
+		spa_node_emit_port_info(&this->hooks,
+				SPA_DIRECTION_OUTPUT, 0, &port->info);
+		port->info.change_mask = old;
+	}
+}
+
+static int
+impl_node_add_listener(void *object,
+		struct spa_hook *listener,
+		const struct spa_node_events *events,
+		void *data)
+{
+	struct impl *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_port_info(this, &this->port, 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 impl *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 impl *this = object;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	spa_node_emit_result(&this->hooks, seq, 0, 0, NULL);
+
+	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 impl *this = object;
+	struct 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 = &this->port;
+
+	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;
+		if (this->transport == NULL)
+			return -EIO;
+
+		/* set the info structure */
+		struct spa_audio_info_raw info = { 0, };
+		info.format = SPA_AUDIO_FORMAT_S16_LE;
+		info.channels = 1;
+		info.position[0] = SPA_AUDIO_CHANNEL_MONO;
+
+		 /* CVSD format has a rate of 8kHz
+		  * MSBC format has a rate of 16kHz */
+		if (this->transport->codec == HFP_AUDIO_CODEC_MSBC)
+			info.rate = 16000;
+		else
+			info.rate = 8000;
+
+		/* build the param */
+		param = spa_format_audio_raw_build(&b, id, &info);
+		break;
+
+	case SPA_PARAM_Format:
+		if (!port->have_format)
+			return -EIO;
+		if (result.index > 0)
+			return 0;
+
+		param = spa_format_audio_raw_build(&b, id, &port->current_format.info.raw);
+		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(
+							this->quantum_limit * port->frame_size,
+							16 * port->frame_size,
+							INT32_MAX),
+			SPA_PARAM_BUFFERS_stride,  SPA_POD_Int(port->frame_size));
+		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;
+		case 1:
+			param = spa_pod_builder_add_object(&b,
+				SPA_TYPE_OBJECT_ParamIO, id,
+				SPA_PARAM_IO_id,   SPA_POD_Id(SPA_IO_RateMatch),
+				SPA_PARAM_IO_size, SPA_POD_Int(sizeof(struct spa_io_rate_match)));
+			break;
+		default:
+			return 0;
+		}
+		break;
+
+	case SPA_PARAM_Latency:
+		switch (result.index) {
+		case 0:
+			param = spa_latency_build(&b, id, &port->latency);
+			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 impl *this, struct port *port)
+{
+	do_stop(this);
+	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(struct impl *this, struct port *port,
+			   uint32_t flags,
+			   const struct spa_pod *format)
+{
+	int err;
+
+	if (format == NULL) {
+		spa_log_debug(this->log, "clear format");
+		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_audio ||
+		    info.media_subtype != SPA_MEDIA_SUBTYPE_raw)
+			return -EINVAL;
+
+		if (spa_format_audio_raw_parse(format, &info.info.raw) < 0)
+			return -EINVAL;
+
+		if (info.info.raw.format != SPA_AUDIO_FORMAT_S16_LE ||
+		    info.info.raw.rate == 0 ||
+		    info.info.raw.channels != 1)
+			return -EINVAL;
+
+		port->frame_size = info.info.raw.channels * 2;
+		port->current_format = info;
+		port->have_format = true;
+	}
+
+	port->info.change_mask |= SPA_PORT_CHANGE_MASK_PARAMS;
+	if (port->have_format) {
+		port->info.change_mask |= SPA_PORT_CHANGE_MASK_FLAGS;
+		port->info.flags = SPA_PORT_FLAG_LIVE;
+		port->info.change_mask |= SPA_PORT_CHANGE_MASK_RATE;
+		port->info.rate = SPA_FRACTION(1, port->current_format.info.raw.rate);
+		port->params[IDX_Format] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_READWRITE);
+		port->params[IDX_Buffers] = SPA_PARAM_INFO(SPA_PARAM_Buffers, SPA_PARAM_INFO_READ);
+		port->params[IDX_Latency].flags ^= SPA_PARAM_INFO_SERIAL;
+	} else {
+		port->params[IDX_Format] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
+		port->params[IDX_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 impl *this = object;
+	struct port *port;
+	int res;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	spa_return_val_if_fail(CHECK_PORT(node, direction, port_id), -EINVAL);
+	port = &this->port;
+
+	switch (id) {
+	case SPA_PARAM_Format:
+		res = port_set_format(this, port, flags, param);
+		break;
+	case SPA_PARAM_Latency:
+		res = 0;
+		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 impl *this = object;
+	struct 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 = &this->port;
+
+	spa_log_debug(this->log, "use buffers %d", n_buffers);
+
+	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->h = spa_buffer_find_meta_data(buffers[i], SPA_META_Header, sizeof(*b->h));
+
+		if (d[0].data == NULL) {
+			spa_log_error(this->log, "%p: need mapped memory", this);
+			return -EINVAL;
+		}
+		spa_list_append(&port->free, &b->link);
+		b->outstanding = false;
+	}
+	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 impl *this = object;
+	struct port *port;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+	port = &this->port;
+
+	switch (id) {
+	case SPA_IO_Buffers:
+		port->io = data;
+		break;
+	case SPA_IO_RateMatch:
+		port->rate_match = 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 impl *this = object;
+	struct port *port;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	spa_return_val_if_fail(port_id == 0, -EINVAL);
+	port = &this->port;
+
+	if (port->n_buffers == 0)
+		return -EIO;
+
+	if (buffer_id >= port->n_buffers)
+		return -EINVAL;
+
+	recycle_buffer(this, port, buffer_id);
+
+	return 0;
+}
+
+static uint32_t get_samples(struct impl *this, uint32_t *duration)
+{
+	struct port *port = &this->port;
+	uint32_t samples;
+
+	if (SPA_LIKELY(port->rate_match) && this->resampling) {
+		samples = port->rate_match->size;
+	} else {
+		if (SPA_LIKELY(this->position))
+			samples = this->position->clock.duration * port->current_format.info.raw.rate
+				/ this->position->clock.rate.denom;
+		else
+			samples = 1024;
+	}
+
+	if (SPA_LIKELY(this->position))
+		*duration = this->position->clock.duration * port->current_format.info.raw.rate
+			/ this->position->clock.rate.denom;
+	else if (SPA_LIKELY(this->clock))
+		*duration = this->clock->duration * port->current_format.info.raw.rate
+			/ this->clock->rate.denom;
+	else
+		*duration = 1024 * port->current_format.info.raw.rate / 48000;
+
+	return samples;
+}
+
+static void process_buffering(struct impl *this)
+{
+	struct port *port = &this->port;
+	uint32_t duration;
+	const uint32_t samples = get_samples(this, &duration);
+	void *buf;
+	uint32_t avail;
+
+	spa_bt_decode_buffer_process(&port->buffer, samples, duration);
+
+	setup_matching(this);
+
+	buf = spa_bt_decode_buffer_get_read(&port->buffer, &avail);
+
+	/* copy data to buffers */
+	if (!spa_list_is_empty(&port->free) && avail > 0) {
+		struct buffer *buffer;
+		struct spa_data *datas;
+		uint32_t data_size;
+
+		data_size = samples * port->frame_size;
+
+		avail = SPA_MIN(avail, data_size);
+
+		spa_bt_decode_buffer_read(&port->buffer, avail);
+
+		buffer = spa_list_first(&port->free, struct buffer, link);
+		spa_list_remove(&buffer->link);
+
+		spa_log_trace(this->log, "dequeue %d", buffer->id);
+
+		datas = buffer->buf->datas;
+
+		spa_assert(datas[0].maxsize >= data_size);
+
+		datas[0].chunk->offset = 0;
+		datas[0].chunk->size = avail;
+		datas[0].chunk->stride = port->frame_size;
+		memcpy(datas[0].data, buf, avail);
+
+		/* ready buffer if full */
+		spa_log_trace(this->log, "queue %d frames:%d", buffer->id, (int)avail / port->frame_size);
+		spa_list_append(&port->ready, &buffer->link);
+	}
+}
+
+static int produce_buffer(struct impl *this)
+{
+	struct buffer *buffer;
+	struct port *port = &this->port;
+	struct spa_io_buffers *io = port->io;
+
+	if (io == NULL)
+		return -EIO;
+
+	/* Return if we already have a buffer */
+	if (io->status == SPA_STATUS_HAVE_DATA)
+		return SPA_STATUS_HAVE_DATA;
+
+	/* Recycle */
+	if (io->buffer_id < port->n_buffers) {
+		recycle_buffer(this, port, io->buffer_id);
+		io->buffer_id = SPA_ID_INVALID;
+	}
+
+	/* Handle buffering */
+	process_buffering(this);
+
+	/* Return if there are no buffers ready to be processed */
+	if (spa_list_is_empty(&port->ready))
+		return SPA_STATUS_OK;
+
+	/* Get the new buffer from the ready list */
+	buffer = spa_list_first(&port->ready, struct buffer, link);
+	spa_list_remove(&buffer->link);
+	buffer->outstanding = true;
+
+	/* Set the new buffer in IO */
+	io->buffer_id = buffer->id;
+	io->status = SPA_STATUS_HAVE_DATA;
+
+	/* Notify we have a buffer ready to be processed */
+	return SPA_STATUS_HAVE_DATA;
+}
+
+static int impl_node_process(void *object)
+{
+	struct impl *this = object;
+	struct port *port;
+	struct spa_io_buffers *io;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	port = &this->port;
+	if ((io = port->io) == NULL)
+		return -EIO;
+
+	/* Return if we already have a buffer */
+	if (io->status == SPA_STATUS_HAVE_DATA)
+		return SPA_STATUS_HAVE_DATA;
+
+	/* Recycle */
+	if (io->buffer_id < port->n_buffers) {
+		recycle_buffer(this, port, io->buffer_id);
+		io->buffer_id = SPA_ID_INVALID;
+	}
+
+	/* Follower produces buffers here, driver in timeout */
+	if (this->following)
+		return produce_buffer(this);
+	else
+		return SPA_STATUS_OK;
+}
+
+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 do_transport_destroy(struct spa_loop *loop,
+				bool async,
+				uint32_t seq,
+				const void *data,
+				size_t size,
+				void *user_data)
+{
+	struct impl *this = user_data;
+	this->transport = NULL;
+	return 0;
+}
+
+static void transport_destroy(void *data)
+{
+	struct impl *this = data;
+	spa_log_debug(this->log, "transport %p destroy", this->transport);
+	spa_loop_invoke(this->data_loop, do_transport_destroy, 0, NULL, 0, true, this);
+}
+
+static const struct spa_bt_transport_events transport_events = {
+	SPA_VERSION_BT_TRANSPORT_EVENTS,
+	.destroy = transport_destroy,
+};
+
+static int impl_get_interface(struct spa_handle *handle, const char *type, void **interface)
+{
+	struct impl *this;
+
+	spa_return_val_if_fail(handle != NULL, -EINVAL);
+	spa_return_val_if_fail(interface != NULL, -EINVAL);
+
+	this = (struct impl *) 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 impl *this = (struct impl *) handle;
+
+	do_stop(this);
+	if (this->transport)
+		spa_hook_remove(&this->transport_listener);
+	spa_system_close(this->data_system, this->timerfd);
+	spa_bt_decode_buffer_clear(&this->port.buffer);
+	return 0;
+}
+
+static size_t
+impl_get_size(const struct spa_handle_factory *factory,
+	      const struct spa_dict *params)
+{
+	return sizeof(struct impl);
+}
+
+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 impl *this;
+	struct port *port;
+	const char *str;
+
+	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 impl *) handle;
+
+	this->log = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_Log);
+	this->data_loop = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_DataLoop);
+	this->data_system = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_DataSystem);
+
+	spa_log_topic_init(this->log, &log_topic);
+
+	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);
+
+	reset_props(&this->props);
+
+	/* set the node info */
+	this->info_all = SPA_NODE_CHANGE_MASK_FLAGS |
+			SPA_NODE_CHANGE_MASK_PROPS |
+			SPA_NODE_CHANGE_MASK_PARAMS;
+	this->info = SPA_NODE_INFO_INIT();
+	this->info.flags = SPA_NODE_FLAG_RT;
+	this->params[IDX_PropInfo] = SPA_PARAM_INFO(SPA_PARAM_PropInfo, SPA_PARAM_INFO_READ);
+	this->params[IDX_Props] = SPA_PARAM_INFO(SPA_PARAM_Props, SPA_PARAM_INFO_READWRITE);
+	this->params[IDX_NODE_IO] = SPA_PARAM_INFO(SPA_PARAM_IO, SPA_PARAM_INFO_READ);
+	this->info.params = this->params;
+	this->info.n_params = N_NODE_PARAMS;
+
+	/* set the port info */
+	port = &this->port;
+	port->info_all = SPA_PORT_CHANGE_MASK_FLAGS |
+			SPA_PORT_CHANGE_MASK_PARAMS;
+	port->info = SPA_PORT_INFO_INIT();
+	port->info.change_mask = SPA_PORT_CHANGE_MASK_FLAGS;
+	port->info.flags = SPA_PORT_FLAG_LIVE |
+			   SPA_PORT_FLAG_TERMINAL;
+	port->params[IDX_EnumFormat] = SPA_PARAM_INFO(SPA_PARAM_EnumFormat, SPA_PARAM_INFO_READ);
+	port->params[IDX_Meta] = SPA_PARAM_INFO(SPA_PARAM_Meta, SPA_PARAM_INFO_READ);
+	port->params[IDX_IO] = SPA_PARAM_INFO(SPA_PARAM_IO, SPA_PARAM_INFO_READ);
+	port->params[IDX_Format] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
+	port->params[IDX_Buffers] = SPA_PARAM_INFO(SPA_PARAM_Buffers, 0);
+	port->params[IDX_Latency] = SPA_PARAM_INFO(SPA_PARAM_Latency, SPA_PARAM_INFO_READWRITE);
+	port->info.params = port->params;
+	port->info.n_params = N_PORT_PARAMS;
+
+	port->latency = SPA_LATENCY_INFO(SPA_DIRECTION_OUTPUT);
+	port->latency.min_quantum = 1.0f;
+	port->latency.max_quantum = 1.0f;
+
+	/* Init the buffer lists */
+	spa_list_init(&port->ready);
+	spa_list_init(&port->free);
+
+	this->quantum_limit = 8192;
+	if (info && (str = spa_dict_lookup(info, "clock.quantum-limit")))
+		spa_atou32(str, &this->quantum_limit, 0);
+
+	if (info && (str = spa_dict_lookup(info, SPA_KEY_API_BLUEZ5_TRANSPORT)))
+		sscanf(str, "pointer:%p", &this->transport);
+
+	if (this->transport == NULL) {
+		spa_log_error(this->log, "a transport is needed");
+		return -EINVAL;
+	}
+	spa_bt_transport_add_listener(this->transport,
+			&this->transport_listener, &transport_events, this);
+
+	this->timerfd = spa_system_timerfd_create(this->data_system,
+			CLOCK_MONOTONIC, SPA_FD_CLOEXEC | SPA_FD_NONBLOCK);
+
+	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);
+
+	switch (*index) {
+	case 0:
+		*info = &impl_interfaces[*index];
+		break;
+	default:
+		return 0;
+	}
+	(*index)++;
+	return 1;
+}
+
+static const struct spa_dict_item info_items[] = {
+	{ SPA_KEY_FACTORY_AUTHOR, "Collabora Ltd. <contact@collabora.com>" },
+	{ SPA_KEY_FACTORY_DESCRIPTION, "Capture bluetooth audio with hsp/hfp" },
+	{ SPA_KEY_FACTORY_USAGE, SPA_KEY_API_BLUEZ5_TRANSPORT"=<transport>" },
+};
+
+static const struct spa_dict info = SPA_DICT_INIT_ARRAY(info_items);
+
+const struct spa_handle_factory spa_sco_source_factory = {
+	SPA_VERSION_HANDLE_FACTORY,
+	SPA_NAME_API_BLUEZ5_SCO_SOURCE,
+	&info,
+	impl_get_size,
+	impl_init,
+	impl_enum_interface_info,
+};