Adding upstream version 0.3.65.upstream/0.3.65upstream

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

1 files changed, 1868 insertions, 0 deletions

diff --git a/spa/plugins/bluez5/media-sink.c b/spa/plugins/bluez5/media-sink.c
new file mode 100644
index 0000000..29eec1f
--- /dev/null
+++ b/spa/plugins/bluez5/media-sink.c
@@ -0,0 +1,1868 @@
+/* Spa Media Sink
+ *
+ * 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 <unistd.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <arpa/inet.h>
+#include <sys/ioctl.h>
+
+#include <spa/support/plugin.h>
+#include <spa/support/loop.h>
+#include <spa/support/log.h>
+#include <spa/support/system.h>
+#include <spa/utils/list.h>
+#include <spa/utils/keys.h>
+#include <spa/utils/names.h>
+#include <spa/utils/result.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 <spa/debug/mem.h>
+#include <spa/debug/log.h>
+
+#include <sbc/sbc.h>
+
+#include "defs.h"
+#include "rtp.h"
+#include "media-codecs.h"
+
+static struct spa_log_topic log_topic = SPA_LOG_TOPIC(0, "spa.bluez5.sink.media");
+#undef SPA_LOG_TOPIC_DEFAULT
+#define SPA_LOG_TOPIC_DEFAULT &log_topic
+
+#define DEFAULT_CLOCK_NAME	"clock.system.monotonic"
+
+struct props {
+	int64_t latency_offset;
+	char clock_name[64];
+};
+
+#define FILL_FRAMES 4
+#define MIN_BUFFERS 2
+#define MAX_BUFFERS 32
+#define BUFFER_SIZE	(8192*8)
+
+struct buffer {
+	uint32_t id;
+#define BUFFER_FLAG_OUT	(1<<0)
+	uint32_t flags;
+	struct spa_buffer *buf;
+	struct spa_meta_header *h;
+	struct spa_list link;
+};
+
+struct port {
+	struct spa_audio_info current_format;
+	uint32_t frame_size;
+	unsigned int have_format:1;
+
+	uint64_t info_all;
+	struct spa_port_info info;
+	struct spa_io_buffers *io;
+	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;
+
+	size_t ready_offset;
+};
+
+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 N_NODE_PARAMS	2
+	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 is_output:1;
+	unsigned int flush_pending:1;
+
+	unsigned int is_duplex:1;
+
+	struct spa_source source;
+	int timerfd;
+	struct spa_source flush_source;
+	struct spa_source flush_timer_source;
+	int flush_timerfd;
+
+	struct spa_io_clock *clock;
+	struct spa_io_position *position;
+
+	uint64_t current_time;
+	uint64_t next_time;
+	uint64_t last_error;
+	uint64_t process_time;
+
+	uint64_t prev_flush_time;
+	uint64_t next_flush_time;
+
+	const struct media_codec *codec;
+	bool codec_props_changed;
+	void *codec_props;
+	void *codec_data;
+	struct spa_audio_info codec_format;
+
+	int need_flush;
+	bool fragment;
+	uint32_t block_size;
+	uint8_t buffer[BUFFER_SIZE];
+	uint32_t buffer_used;
+	uint32_t header_size;
+	uint32_t block_count;
+	uint16_t seqnum;
+	uint32_t timestamp;
+	uint64_t sample_count;
+	uint8_t tmp_buffer[BUFFER_SIZE];
+	uint32_t tmp_buffer_used;
+	uint32_t fd_buffer_size;
+};
+
+#define CHECK_PORT(this,d,p)	((d) == SPA_DIRECTION_INPUT && (p) == 0)
+
+static void reset_props(struct impl *this, struct props *props)
+{
+	props->latency_offset = 0;
+	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, index_offset = 0;
+	bool enum_codec = false;
+
+	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) {
+		case 0:
+			param = spa_pod_builder_add_object(&b,
+				SPA_TYPE_OBJECT_PropInfo, id,
+				SPA_PROP_INFO_id,   SPA_POD_Id(SPA_PROP_latencyOffsetNsec),
+				SPA_PROP_INFO_description, SPA_POD_String("Latency offset (ns)"),
+				SPA_PROP_INFO_type, SPA_POD_CHOICE_RANGE_Long(0LL, INT64_MIN, INT64_MAX));
+			break;
+		default:
+			enum_codec = true;
+			index_offset = 1;
+		}
+		break;
+	}
+	case SPA_PARAM_Props:
+	{
+		struct props *p = &this->props;
+
+		switch (result.index) {
+		case 0:
+			param = spa_pod_builder_add_object(&b,
+				SPA_TYPE_OBJECT_Props, id,
+				SPA_PROP_latencyOffsetNsec, SPA_POD_Long(p->latency_offset));
+			break;
+		default:
+			enum_codec = true;
+			index_offset = 1;
+		}
+		break;
+	}
+	default:
+		return -ENOENT;
+	}
+
+	if (enum_codec) {
+		int res;
+		if (this->codec->enum_props == NULL || this->codec_props == NULL ||
+		    this->transport == NULL)
+			return 0;
+		else if ((res = this->codec->enum_props(this->codec_props,
+					this->transport->device->settings,
+					id, result.index - index_offset, &b, &param)) != 1)
+			return res;
+	}
+
+	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;
+	set_timers(this);
+	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 void emit_port_info(struct impl *this, struct port *port, bool full);
+
+static void set_latency(struct impl *this, bool emit_latency)
+{
+	struct port *port = &this->port;
+	int64_t delay;
+
+	if (this->transport == NULL)
+		return;
+
+	delay = spa_bt_transport_get_delay_nsec(this->transport);
+	delay += SPA_CLAMP(this->props.latency_offset, -delay, INT64_MAX / 2);
+	port->latency.min_ns = port->latency.max_ns = delay;
+
+	if (emit_latency) {
+		port->info.change_mask |= SPA_PORT_CHANGE_MASK_PARAMS;
+		port->params[IDX_Latency].flags ^= SPA_PARAM_INFO_SERIAL;
+		emit_port_info(this, port, false);
+	}
+}
+
+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(this, &new_props);
+	} else {
+		spa_pod_parse_object(param,
+				SPA_TYPE_OBJECT_Props, NULL,
+				SPA_PROP_latencyOffsetNsec, SPA_POD_OPT_Long(&new_props.latency_offset));
+	}
+
+	changed = (memcmp(&new_props, &this->props, sizeof(struct props)) != 0);
+	this->props = new_props;
+
+	if (changed)
+		set_latency(this, true);
+
+	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:
+	{
+		int res, codec_res = 0;
+		res = apply_props(this, param);
+		if (this->codec_props && this->codec->set_props) {
+			codec_res = this->codec->set_props(this->codec_props, param);
+			if (codec_res > 0)
+				this->codec_props_changed = true;
+		}
+		if (res > 0 || codec_res > 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 int reset_buffer(struct impl *this)
+{
+	if (this->codec_props_changed && this->codec_props
+			&& this->codec->update_props) {
+		this->codec->update_props(this->codec_data, this->codec_props);
+		this->codec_props_changed = false;
+	}
+	this->need_flush = 0;
+	this->block_count = 0;
+	this->fragment = false;
+	this->buffer_used = this->codec->start_encode(this->codec_data,
+			this->buffer, sizeof(this->buffer),
+			this->seqnum++, this->timestamp);
+	this->header_size = this->buffer_used;
+	this->timestamp = this->sample_count;
+	return 0;
+}
+
+static int get_transport_unused_size(struct impl *this)
+{
+	int res, value;
+	res = ioctl(this->flush_source.fd, TIOCOUTQ, &value);
+	if (res < 0) {
+		spa_log_error(this->log, "%p: ioctl fail: %m", this);
+		return -errno;
+	}
+	spa_log_trace(this->log, "%p: fd unused buffer size:%d/%d", this, value, this->fd_buffer_size);
+	return value;
+}
+
+static int send_buffer(struct impl *this)
+{
+	int written, unsent;
+
+	unsent = get_transport_unused_size(this);
+	if (unsent >= 0) {
+		unsent = this->fd_buffer_size - unsent;
+		this->codec->abr_process(this->codec_data, unsent);
+	}
+
+	written = send(this->flush_source.fd, this->buffer,
+			this->buffer_used, MSG_DONTWAIT | MSG_NOSIGNAL);
+
+	if (SPA_UNLIKELY(spa_log_level_topic_enabled(this->log, SPA_LOG_TOPIC_DEFAULT, SPA_LOG_LEVEL_TRACE))) {
+		struct timespec ts;
+		uint64_t now;
+		uint64_t dt;
+
+		spa_system_clock_gettime(this->data_system, CLOCK_MONOTONIC, &ts);
+		now = SPA_TIMESPEC_TO_NSEC(&ts);
+		dt = now - this->prev_flush_time;
+		this->prev_flush_time = now;
+
+		spa_log_trace(this->log,
+				"%p: send blocks:%d block:%u seq:%u ts:%u size:%u "
+				"wrote:%d dt:%"PRIu64,
+				this, this->block_count, this->block_size, this->seqnum,
+				this->timestamp, this->buffer_used, written, dt);
+	}
+
+	if (written < 0) {
+		spa_log_debug(this->log, "%p: %m", this);
+		return -errno;
+	}
+
+	return written;
+}
+
+static int encode_buffer(struct impl *this, const void *data, uint32_t size)
+{
+	int processed;
+	size_t out_encoded;
+	struct port *port = &this->port;
+	const void *from_data = data;
+	int from_size = size;
+
+	spa_log_trace(this->log, "%p: encode %d used %d, %d %d %d",
+			this, size, this->buffer_used, port->frame_size, this->block_size,
+			this->block_count);
+
+	if (this->need_flush)
+		return 0;
+
+	if (this->buffer_used >= sizeof(this->buffer))
+		return -ENOSPC;
+
+	if (size < this->block_size - this->tmp_buffer_used) {
+		memcpy(this->tmp_buffer + this->tmp_buffer_used, data, size);
+		this->tmp_buffer_used += size;
+		return size;
+	} else if (this->tmp_buffer_used > 0) {
+		memcpy(this->tmp_buffer + this->tmp_buffer_used, data, this->block_size - this->tmp_buffer_used);
+		from_data = this->tmp_buffer;
+		from_size = this->block_size;
+		this->tmp_buffer_used = this->block_size - this->tmp_buffer_used;
+	}
+
+	processed = this->codec->encode(this->codec_data,
+				from_data, from_size,
+				this->buffer + this->buffer_used,
+				sizeof(this->buffer) - this->buffer_used,
+				&out_encoded, &this->need_flush);
+	if (processed < 0)
+		return processed;
+
+	this->sample_count += processed / port->frame_size;
+	this->block_count += processed / this->block_size;
+	this->buffer_used += out_encoded;
+
+	spa_log_trace(this->log, "%p: processed %d %zd used %d",
+			this, processed, out_encoded, this->buffer_used);
+
+	if (this->tmp_buffer_used) {
+		processed = this->tmp_buffer_used;
+		this->tmp_buffer_used = 0;
+	}
+	return processed;
+}
+
+static int encode_fragment(struct impl *this)
+{
+	int res;
+	size_t out_encoded;
+	struct port *port = &this->port;
+
+	spa_log_trace(this->log, "%p: encode fragment used %d, %d %d %d",
+			this, this->buffer_used, port->frame_size, this->block_size,
+			this->block_count);
+
+	if (this->need_flush)
+		return 0;
+
+	res = this->codec->encode(this->codec_data,
+				NULL, 0,
+				this->buffer + this->buffer_used,
+				sizeof(this->buffer) - this->buffer_used,
+				&out_encoded, &this->need_flush);
+	if (res < 0)
+		return res;
+	if (res != 0)
+		return -EINVAL;
+
+	this->buffer_used += out_encoded;
+
+	spa_log_trace(this->log, "%p: processed fragment %zd used %d",
+			this, out_encoded, this->buffer_used);
+
+	return 0;
+}
+
+static int flush_buffer(struct impl *this)
+{
+	spa_log_trace(this->log, "%p: used:%d block_size:%d", this,
+			this->buffer_used, this->block_size);
+
+	if (this->need_flush)
+		return send_buffer(this);
+
+	return 0;
+}
+
+static int add_data(struct impl *this, const void *data, uint32_t size)
+{
+	int processed, total = 0;
+
+	while (size > 0) {
+		processed = encode_buffer(this, data, size);
+
+		if (processed <= 0)
+			return total > 0 ? total : processed;
+
+		data = SPA_PTROFF(data, processed, void);
+		size -= processed;
+		total += processed;
+	}
+	return total;
+}
+
+static void enable_flush_timer(struct impl *this, bool enabled)
+{
+	struct itimerspec ts;
+
+	if (!enabled)
+		this->next_flush_time = 0;
+
+	ts.it_value.tv_sec = this->next_flush_time / SPA_NSEC_PER_SEC;
+	ts.it_value.tv_nsec = this->next_flush_time % SPA_NSEC_PER_SEC;
+	ts.it_interval.tv_sec = 0;
+	ts.it_interval.tv_nsec = 0;
+	spa_system_timerfd_settime(this->data_system,
+			this->flush_timerfd, SPA_FD_TIMER_ABSTIME, &ts, NULL);
+
+	this->flush_pending = enabled;
+}
+
+static uint32_t get_queued_frames(struct impl *this)
+{
+	struct port *port = &this->port;
+	uint32_t bytes = 0;
+	struct buffer *b;
+
+	spa_list_for_each(b, &port->ready, link) {
+		struct spa_data *d = b->buf->datas;
+
+		bytes += d[0].chunk->size;
+	}
+
+	if (bytes > port->ready_offset)
+		bytes -= port->ready_offset;
+	else
+		bytes = 0;
+
+	return bytes / port->frame_size;
+}
+
+static int flush_data(struct impl *this, uint64_t now_time)
+{
+	int written;
+	uint32_t total_frames;
+	struct port *port = &this->port;
+	int unused_buffer;
+
+	if (!this->flush_source.loop) {
+		/* I/O in error state */
+		return -EIO;
+	}
+
+	total_frames = 0;
+again:
+	written = 0;
+	if (this->fragment && !this->need_flush) {
+		int res;
+		this->fragment = false;
+		if ((res = encode_fragment(this)) < 0) {
+			/* Error */
+			reset_buffer(this);
+			return res;
+		}
+	}
+	while (!spa_list_is_empty(&port->ready) && !this->need_flush) {
+		uint8_t *src;
+		uint32_t n_bytes, n_frames;
+		struct buffer *b;
+		struct spa_data *d;
+		uint32_t index, offs, avail, l0, l1;
+
+		b = spa_list_first(&port->ready, struct buffer, link);
+		d = b->buf->datas;
+
+		src = d[0].data;
+
+		index = d[0].chunk->offset + port->ready_offset;
+		avail = d[0].chunk->size - port->ready_offset;
+		avail /= port->frame_size;
+
+		offs = index % d[0].maxsize;
+		n_frames = avail;
+		n_bytes = n_frames * port->frame_size;
+
+		l0 = SPA_MIN(n_bytes, d[0].maxsize - offs);
+		l1 = n_bytes - l0;
+
+		written = add_data(this, src + offs, l0);
+		if (written > 0 && l1 > 0)
+			written += add_data(this, src, l1);
+		if (written <= 0) {
+			if (written < 0 && written != -ENOSPC) {
+				spa_list_remove(&b->link);
+				SPA_FLAG_SET(b->flags, BUFFER_FLAG_OUT);
+				this->port.io->buffer_id = b->id;
+				spa_log_warn(this->log, "%p: error %s, reuse buffer %u",
+						this, spa_strerror(written), b->id);
+				spa_node_call_reuse_buffer(&this->callbacks, 0, b->id);
+				port->ready_offset = 0;
+			}
+			break;
+		}
+
+		n_frames = written / port->frame_size;
+
+		port->ready_offset += written;
+
+		if (port->ready_offset >= d[0].chunk->size) {
+			spa_list_remove(&b->link);
+			SPA_FLAG_SET(b->flags, BUFFER_FLAG_OUT);
+			spa_log_trace(this->log, "%p: reuse buffer %u", this, b->id);
+			this->port.io->buffer_id = b->id;
+
+			spa_node_call_reuse_buffer(&this->callbacks, 0, b->id);
+			port->ready_offset = 0;
+		}
+		total_frames += n_frames;
+
+		spa_log_trace(this->log, "%p: written %u frames", this, total_frames);
+	}
+
+	if (written > 0 && this->buffer_used == this->header_size) {
+		enable_flush_timer(this, false);
+		return 0;
+	}
+
+	if (this->flush_pending) {
+		spa_log_trace(this->log, "%p: wait for flush timer", this);
+		return 0;
+	}
+
+	/*
+	 * Get socket queue size before writing to it.
+	 * This should be the same as buffer size to increase bitpool
+	 * Bitpool shouldn't be increased when data is left over in the buffer
+	 */
+	unused_buffer = get_transport_unused_size(this);
+
+	written = flush_buffer(this);
+
+	if (written == -EAGAIN) {
+		spa_log_trace(this->log, "%p: fail flush", this);
+		if (now_time - this->last_error > SPA_NSEC_PER_SEC / 2) {
+			int res = this->codec->reduce_bitpool(this->codec_data);
+
+			spa_log_debug(this->log, "%p: reduce bitpool: %i", this, res);
+			this->last_error = now_time;
+		}
+
+		/*
+		 * The socket buffer is full, and the device is not processing data
+		 * fast enough, so should just skip this packet. There will be a sound
+		 * glitch in any case.
+		 */
+		written = this->buffer_used;
+	}
+
+	if (written < 0) {
+		spa_log_trace(this->log, "%p: error flushing %s", this,
+				spa_strerror(written));
+		reset_buffer(this);
+		enable_flush_timer(this, false);
+		return written;
+	}
+	else if (written > 0) {
+		/*
+		 * We cannot write all data we have at once, since this can exceed device
+		 * buffers (esp. for the A2DP low-latency codecs) and socket buffers, so
+		 * flush needs to be delayed.
+		 */
+		uint32_t packet_samples = this->block_count * this->block_size
+			/ port->frame_size;
+		uint64_t packet_time = (uint64_t)packet_samples * SPA_NSEC_PER_SEC
+			/ port->current_format.info.raw.rate;
+
+		if (SPA_LIKELY(this->position)) {
+			uint32_t frames = get_queued_frames(this);
+			uint64_t duration_ns;
+
+			/*
+			 * Flush at the time position of the next buffered sample.
+			 */
+			duration_ns = ((uint64_t)this->position->clock.duration * SPA_NSEC_PER_SEC
+					/ this->position->clock.rate.denom);
+			this->next_flush_time = this->process_time + duration_ns
+				- ((uint64_t)frames * SPA_NSEC_PER_SEC
+						/ port->current_format.info.raw.rate);
+
+			/*
+			 * We could delay the output by one packet to avoid waiting
+			 * for the next buffer and so make send intervals exactly regular.
+			 * However, this is not needed for A2DP or BAP. The controller
+			 * will do the scheduling for us, and there's also the socket buffer
+			 * in between.
+			 */
+#if 0
+			this->next_flush_time += SPA_MIN(packet_time,
+					duration_ns * (port->n_buffers - 1));
+#endif
+		} else {
+			if (this->next_flush_time == 0)
+				this->next_flush_time = this->process_time;
+			this->next_flush_time += packet_time;
+		}
+
+		if (this->need_flush == NEED_FLUSH_FRAGMENT) {
+			reset_buffer(this);
+			this->fragment = true;
+			goto again;
+		}
+
+		if (now_time - this->last_error > SPA_NSEC_PER_SEC) {
+			if (unused_buffer == (int)this->fd_buffer_size) {
+				int res = this->codec->increase_bitpool(this->codec_data);
+
+				spa_log_debug(this->log, "%p: increase bitpool: %i", this, res);
+			}
+			this->last_error = now_time;
+		}
+
+		spa_log_trace(this->log, "%p: flush at:%"PRIu64" process:%"PRIu64, this,
+				this->next_flush_time, this->process_time);
+		reset_buffer(this);
+		enable_flush_timer(this, true);
+	}
+	else {
+		/* Don't want to flush yet, or failed to write anything */
+		spa_log_trace(this->log, "%p: skip flush", this);
+		enable_flush_timer(this, false);
+	}
+	return 0;
+}
+
+static void media_on_flush_error(struct spa_source *source)
+{
+	struct impl *this = source->data;
+
+	spa_log_trace(this->log, "%p: flush event", this);
+
+	if (source->rmask & (SPA_IO_ERR | SPA_IO_HUP)) {
+		spa_log_warn(this->log, "%p: error %d", this, source->rmask);
+		if (this->flush_source.loop)
+			spa_loop_remove_source(this->data_loop, &this->flush_source);
+		return;
+	}
+}
+
+static void media_on_flush_timeout(struct spa_source *source)
+{
+	struct impl *this = source->data;
+	uint64_t exp;
+	int res;
+
+	spa_log_trace(this->log, "%p: flush on timeout", this);
+
+	if ((res = spa_system_timerfd_read(this->data_system, this->flush_timerfd, &exp)) < 0) {
+		if (res != -EAGAIN)
+			spa_log_warn(this->log, "error reading timerfd: %s", spa_strerror(res));
+		return;
+	}
+
+	if (this->transport == NULL) {
+		enable_flush_timer(this, false);
+		return;
+	}
+
+	while (exp-- > 0) {
+		this->flush_pending = false;
+		flush_data(this, this->current_time);
+	}
+}
+
+static void media_on_timeout(struct spa_source *source)
+{
+	struct impl *this = source->data;
+	struct port *port = &this->port;
+	uint64_t exp, duration;
+	uint32_t rate;
+	struct spa_io_buffers *io = port->io;
+	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_debug(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;
+	}
+
+	this->next_time = now_time + duration * SPA_NSEC_PER_SEC / rate;
+
+	if (SPA_LIKELY(this->clock)) {
+		int64_t delay_nsec;
+
+		this->clock->nsec = now_time;
+		this->clock->position += duration;
+		this->clock->duration = duration;
+		this->clock->rate_diff = 1.0f;
+		this->clock->next_nsec = this->next_time;
+
+		delay_nsec = spa_bt_transport_get_delay_nsec(this->transport);
+
+		/* Negative delay doesn't work properly, so disallow it */
+		delay_nsec += SPA_CLAMP(this->props.latency_offset, -delay_nsec, INT64_MAX / 2);
+
+		this->clock->delay = (delay_nsec * this->clock->rate.denom) / SPA_NSEC_PER_SEC;
+	}
+
+
+	spa_log_trace(this->log, "%p: %d", this, io->status);
+	io->status = SPA_STATUS_NEED_DATA;
+	spa_node_call_ready(&this->callbacks, SPA_STATUS_NEED_DATA);
+
+	set_timeout(this, this->next_time);
+}
+
+static int do_start(struct impl *this)
+{
+	int res, val, size;
+	struct port *port;
+	socklen_t len;
+	uint8_t *conf;
+	uint32_t flags;
+
+	if (this->started)
+		return 0;
+
+	spa_return_val_if_fail(this->transport, -EIO);
+
+	this->following = is_following(this);
+
+	spa_log_debug(this->log, "%p: start following:%d", this, this->following);
+
+	if ((res = spa_bt_transport_acquire(this->transport, false)) < 0)
+		return res;
+
+	port = &this->port;
+
+	conf = this->transport->configuration;
+	size = this->transport->configuration_len;
+
+	spa_log_debug(this->log, "Transport configuration:");
+	spa_debug_log_mem(this->log, SPA_LOG_LEVEL_DEBUG, 2, conf, (size_t)size);
+
+	flags = this->is_duplex ? MEDIA_CODEC_FLAG_SINK : 0;
+
+	this->codec_data = this->codec->init(this->codec,
+			flags,
+			this->transport->configuration,
+			this->transport->configuration_len,
+			&port->current_format,
+			this->codec_props,
+			this->transport->write_mtu);
+	if (this->codec_data == NULL)
+		return -EIO;
+
+	spa_log_info(this->log, "%p: using %s codec %s, delay:%"PRIi64" ms", this,
+			this->codec->bap ? "BAP" : "A2DP", this->codec->description,
+			(int64_t)(spa_bt_transport_get_delay_nsec(this->transport) / SPA_NSEC_PER_MSEC));
+
+	this->seqnum = 0;
+
+	this->block_size = this->codec->get_block_size(this->codec_data);
+	if (this->block_size > sizeof(this->tmp_buffer)) {
+		spa_log_error(this->log, "block-size %d > %zu",
+				this->block_size, sizeof(this->tmp_buffer));
+		return -EIO;
+	}
+
+	spa_log_debug(this->log, "%p: block_size %d", this, this->block_size);
+
+	val = this->codec->send_buf_size > 0
+			/* The kernel doubles the SO_SNDBUF option value set by setsockopt(). */
+			? this->codec->send_buf_size / 2 + this->codec->send_buf_size % 2
+			: FILL_FRAMES * this->transport->write_mtu;
+	if (setsockopt(this->transport->fd, SOL_SOCKET, SO_SNDBUF, &val, sizeof(val)) < 0)
+		spa_log_warn(this->log, "%p: SO_SNDBUF %m", this);
+
+	len = sizeof(val);
+	if (getsockopt(this->transport->fd, SOL_SOCKET, SO_SNDBUF, &val, &len) < 0) {
+		spa_log_warn(this->log, "%p: SO_SNDBUF %m", this);
+	}
+	else {
+		spa_log_debug(this->log, "%p: SO_SNDBUF: %d", this, val);
+	}
+	this->fd_buffer_size = val;
+
+	val = FILL_FRAMES * this->transport->read_mtu;
+	if (setsockopt(this->transport->fd, SOL_SOCKET, SO_RCVBUF, &val, sizeof(val)) < 0)
+		spa_log_warn(this->log, "%p: SO_RCVBUF %m", this);
+
+	val = 6;
+	if (setsockopt(this->transport->fd, SOL_SOCKET, SO_PRIORITY, &val, sizeof(val)) < 0)
+		spa_log_warn(this->log, "SO_PRIORITY failed: %m");
+
+	reset_buffer(this);
+
+	this->source.data = this;
+	this->source.fd = this->timerfd;
+	this->source.func = media_on_timeout;
+	this->source.mask = SPA_IO_IN;
+	this->source.rmask = 0;
+	spa_loop_add_source(this->data_loop, &this->source);
+
+	this->flush_timer_source.data = this;
+	this->flush_timer_source.fd = this->flush_timerfd;
+	this->flush_timer_source.func = media_on_flush_timeout;
+	this->flush_timer_source.mask = SPA_IO_IN;
+	this->flush_timer_source.rmask = 0;
+	spa_loop_add_source(this->data_loop, &this->flush_timer_source);
+
+	this->flush_source.data = this;
+	this->flush_source.fd = this->transport->fd;
+	this->flush_source.func = media_on_flush_error;
+	this->flush_source.mask = SPA_IO_ERR | SPA_IO_HUP;
+	this->flush_source.rmask = 0;
+	spa_loop_add_source(this->data_loop, &this->flush_source);
+
+	this->flush_pending = false;
+
+	set_timers(this);
+	this->started = true;
+
+	return 0;
+}
+
+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->source.loop)
+		spa_loop_remove_source(this->data_loop, &this->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);
+
+	if (this->flush_source.loop)
+		spa_loop_remove_source(this->data_loop, &this->flush_source);
+
+	if (this->flush_timer_source.loop)
+		spa_loop_remove_source(this->data_loop, &this->flush_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->flush_timerfd, 0, &ts, NULL);
+
+	return 0;
+}
+
+static int do_stop(struct impl *this)
+{
+	int res = 0;
+
+	if (!this->started)
+		return 0;
+
+	spa_log_trace(this->log, "%p: stop", this);
+
+	spa_loop_invoke(this->data_loop, do_remove_source, 0, NULL, 0, true, this);
+
+	this->started = false;
+
+	if (this->transport)
+		res = spa_bt_transport_release(this->transport);
+
+	if (this->codec_data)
+		this->codec->deinit(this->codec_data);
+	this->codec_data = NULL;
+
+	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_Suspend:
+	case SPA_NODE_COMMAND_Pause:
+		if ((res = do_stop(this)) < 0)
+			return res;
+		break;
+	default:
+		return -ENOTSUP;
+	}
+	return 0;
+}
+
+static void emit_node_info(struct impl *this, bool full)
+{
+	struct spa_dict_item node_info_items[] = {
+		{ SPA_KEY_DEVICE_API, "bluez5" },
+		{ SPA_KEY_MEDIA_CLASS, this->is_output ? "Audio/Sink" : "Stream/Input/Audio" },
+		{ "media.name", ((this->transport && this->transport->device->name) ?
+					this->transport->device->name : this->codec->bap ? "BAP" : "A2DP" ) },
+		{ SPA_KEY_NODE_DRIVER, this->is_output ? "true" : "false" },
+	};
+	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 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_INPUT, 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;
+	int res;
+
+	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 (this->codec == NULL)
+			return -EIO;
+		if (this->transport == NULL)
+			return -EIO;
+
+		if ((res = this->codec->enum_config(this->codec,
+					this->is_duplex ? MEDIA_CODEC_FLAG_SINK : 0,
+					this->transport->configuration,
+					this->transport->configuration_len,
+					id, result.index, &b, &param)) != 1)
+			return res;
+		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(
+							MIN_BUFFERS,
+							MIN_BUFFERS,
+							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;
+		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->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.rate == 0 ||
+		    info.info.raw.channels == 0 ||
+		    info.info.raw.channels > SPA_AUDIO_MAX_CHANNELS)
+			return -EINVAL;
+
+		port->frame_size = info.info.raw.channels;
+		switch (info.info.raw.format) {
+		case SPA_AUDIO_FORMAT_S16:
+			port->frame_size *= 2;
+			break;
+		case SPA_AUDIO_FORMAT_S24:
+			port->frame_size *= 3;
+			break;
+		case SPA_AUDIO_FORMAT_S24_32:
+		case SPA_AUDIO_FORMAT_S32:
+		case SPA_AUDIO_FORMAT_F32:
+			port->frame_size *= 4;
+			break;
+		default:
+			return -EINVAL;
+		}
+
+		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];
+
+		b->buf = buffers[i];
+		b->id = i;
+		SPA_FLAG_SET(b->flags, BUFFER_FLAG_OUT);
+
+		b->h = spa_buffer_find_meta_data(buffers[i], SPA_META_Header, sizeof(*b->h));
+
+		if (buffers[i]->datas[0].data == NULL) {
+			spa_log_error(this->log, "%p: need mapped memory", this);
+			return -EINVAL;
+		}
+	}
+	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;
+	default:
+		return -ENOENT;
+	}
+	return 0;
+}
+
+static int impl_node_port_reuse_buffer(void *object, uint32_t port_id, uint32_t buffer_id)
+{
+	return -ENOTSUP;
+}
+
+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;
+
+	if (this->position && this->position->clock.flags & SPA_IO_CLOCK_FLAG_FREEWHEEL) {
+		io->status = SPA_STATUS_NEED_DATA;
+		return SPA_STATUS_HAVE_DATA;
+	}
+
+	if (io->status == SPA_STATUS_HAVE_DATA && io->buffer_id < port->n_buffers) {
+		struct buffer *b = &port->buffers[io->buffer_id];
+
+		if (!SPA_FLAG_IS_SET(b->flags, BUFFER_FLAG_OUT)) {
+			spa_log_warn(this->log, "%p: buffer %u in use", this, io->buffer_id);
+			io->status = -EINVAL;
+			return -EINVAL;
+		}
+
+		spa_log_trace(this->log, "%p: queue buffer %u", this, io->buffer_id);
+
+		spa_list_append(&port->ready, &b->link);
+		SPA_FLAG_CLEAR(b->flags, BUFFER_FLAG_OUT);
+
+		io->buffer_id = SPA_ID_INVALID;
+		io->status = SPA_STATUS_OK;
+	}
+
+	if (this->following) {
+		if (this->position) {
+			this->current_time = this->position->clock.nsec;
+		} else {
+			struct timespec now;
+			spa_system_clock_gettime(this->data_system, CLOCK_MONOTONIC, &now);
+			this->current_time = SPA_TIMESPEC_TO_NSEC(&now);
+		}
+	}
+
+	this->process_time = this->current_time;
+
+	if (!spa_list_is_empty(&port->ready)) {
+		spa_log_trace(this->log, "%p: flush on process", this);
+		flush_data(this, this->current_time);
+	}
+
+	return SPA_STATUS_HAVE_DATA;
+}
+
+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 void transport_delay_changed(void *data)
+{
+	struct impl *this = data;
+	spa_log_debug(this->log, "transport %p delay changed", this->transport);
+	set_latency(this, true);
+}
+
+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 void transport_state_changed(void *data,
+	enum spa_bt_transport_state old,
+	enum spa_bt_transport_state state)
+{
+	struct impl *this = data;
+
+	spa_log_debug(this->log, "%p: transport %p state %d->%d", this, this->transport, old, state);
+
+	if (state < SPA_BT_TRANSPORT_STATE_ACTIVE && old == SPA_BT_TRANSPORT_STATE_ACTIVE &&
+			this->started) {
+		uint8_t buffer[1024];
+		struct spa_pod_builder b = { 0 };
+
+		spa_log_debug(this->log, "%p: transport %p becomes inactive: stop and indicate error",
+				this, this->transport);
+
+		/*
+		 * If establishing connection fails due to remote end not activating
+		 * the transport, we won't get a write error, but instead see a transport
+		 * state change.
+		 *
+		 * Stop and emit a node error, to let upper levels handle it.
+		 */
+
+		do_stop(this);
+
+		spa_pod_builder_init(&b, buffer, sizeof(buffer));
+		spa_node_emit_event(&this->hooks,
+				spa_pod_builder_add_object(&b,
+						SPA_TYPE_EVENT_Node, SPA_NODE_EVENT_Error));
+	}
+}
+
+static const struct spa_bt_transport_events transport_events = {
+	SPA_VERSION_BT_TRANSPORT_EVENTS,
+	.delay_changed = transport_delay_changed,
+	.state_changed = transport_state_changed,
+	.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->codec_props && this->codec->clear_props)
+		this->codec->clear_props(this->codec_props);
+	if (this->transport)
+		spa_hook_remove(&this->transport_listener);
+	spa_system_close(this->data_system, this->timerfd);
+	spa_system_close(this->data_system, this->flush_timerfd);
+	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);
+
+	this->info_all = SPA_NODE_CHANGE_MASK_FLAGS |
+			SPA_NODE_CHANGE_MASK_PARAMS |
+			SPA_NODE_CHANGE_MASK_PROPS;
+	this->info = SPA_NODE_INFO_INIT();
+	this->info.max_input_ports = 1;
+	this->info.max_output_ports = 0;
+	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->info.params = this->params;
+	this->info.n_params = N_NODE_PARAMS;
+
+	port = &this->port;
+	port->info_all = SPA_PORT_CHANGE_MASK_FLAGS |
+			SPA_PORT_CHANGE_MASK_PARAMS;
+	port->info = SPA_PORT_INFO_INIT();
+	port->info.flags = 0;
+	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_INPUT);
+	port->latency.min_quantum = 1.0f;
+	port->latency.max_quantum = 1.0f;
+
+	spa_list_init(&port->ready);
+
+	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, "api.bluez5.a2dp-duplex")) != NULL)
+		this->is_duplex = spa_atob(str);
+
+	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;
+	}
+	if (this->transport->media_codec == NULL) {
+		spa_log_error(this->log, "a transport codec is needed");
+		return -EINVAL;
+	}
+
+	this->codec = this->transport->media_codec;
+
+	if (this->is_duplex) {
+		if (!this->codec->duplex_codec) {
+			spa_log_error(this->log, "transport codec doesn't support duplex");
+			return -EINVAL;
+		}
+		this->codec = this->codec->duplex_codec;
+	}
+
+	if (this->codec->init_props != NULL)
+		this->codec_props = this->codec->init_props(this->codec,
+					this->is_duplex ? MEDIA_CODEC_FLAG_SINK : 0,
+					this->transport->device->settings);
+
+	if (this->codec->bap)
+		this->is_output = this->transport->bap_initiator;
+	else
+		this->is_output = true;
+
+	reset_props(this, &this->props);
+
+	set_latency(this, false);
+
+	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);
+
+	this->flush_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, "Wim Taymans <wim.taymans@gmail.com>" },
+	{ SPA_KEY_FACTORY_DESCRIPTION, "Play audio with the media" },
+	{ 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_media_sink_factory = {
+	SPA_VERSION_HANDLE_FACTORY,
+	SPA_NAME_API_BLUEZ5_MEDIA_SINK,
+	&info,
+	impl_get_size,
+	impl_init,
+	impl_enum_interface_info,
+};
+
+/* Retained for backward compatibility: */
+const struct spa_handle_factory spa_a2dp_sink_factory = {
+	SPA_VERSION_HANDLE_FACTORY,
+	SPA_NAME_API_BLUEZ5_A2DP_SINK,
+	&info,
+	impl_get_size,
+	impl_init,
+	impl_enum_interface_info,
+};