bluez5: add a2dp-source plugin

1 files changed, 1082 insertions, 0 deletions

diff --git a/spa/plugins/bluez5/a2dp-source.c b/spa/plugins/bluez5/a2dp-source.c
new file mode 100644
index 00000000..7303ccbe
--- /dev/null
+++ b/spa/plugins/bluez5/a2dp-source.c
@@ -0,0 +1,1082 @@
+/* Spa A2DP Source
+ *
+ * Copyright © 2018 Wim Taymans
+ * 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 <sys/types.h>
+#include <sys/socket.h>
+
+#include <spa/support/loop.h>
+#include <spa/support/log.h>
+#include <spa/utils/list.h>
+
+#include <spa/node/node.h>
+#include <spa/node/io.h>
+#include <spa/param/param.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"
+#include "rtp.h"
+#include "a2dp-codecs.h"
+
+struct props {
+	uint32_t min_latency;
+	uint32_t max_latency;
+};
+
+#define FILL_FRAMES 2
+#define MAX_BUFFERS 32
+
+struct buffer {
+	uint32_t id;
+	struct spa_buffer *buf;
+	struct spa_meta_header *h;
+	bool outstanding;
+	struct spa_list link;
+};
+
+struct impl {
+	struct spa_handle handle;
+	struct spa_node node;
+
+	struct spa_log *log;
+	struct spa_loop *main_loop;
+	struct spa_loop *data_loop;
+
+	struct spa_hook_list hooks;
+	const struct spa_node_callbacks *callbacks;
+	void *callbacks_data;
+
+	struct props props;
+
+	struct spa_bt_transport *transport;
+
+	bool have_format;
+	struct spa_audio_info current_format;
+	int frame_size;
+
+	uint64_t info_all;
+	struct spa_node_info info;
+	struct spa_param_info params[8];
+	uint64_t port_info_all;
+	struct spa_port_info port_info;
+	struct spa_param_info port_params[8];
+	struct spa_io_buffers *io;
+
+	struct buffer buffers[MAX_BUFFERS];
+	unsigned int n_buffers;
+
+	struct spa_list free;
+	struct spa_list ready;
+
+	uint32_t sample_count;
+
+	bool started;
+	struct spa_source source;
+
+	sbc_t sbc;
+	uint8_t buffer_read[4096];
+	struct timespec now;
+};
+
+#define NAME "a2dp-source"
+
+#define CHECK_PORT(this,d,p)    ((d) == SPA_DIRECTION_OUTPUT && (p) == 0)
+
+static const uint32_t default_min_latency = 128;
+static const uint32_t default_max_latency = 1024;
+
+static void reset_props(struct props *props)
+{
+	props->min_latency = default_min_latency;
+	props->max_latency = default_max_latency;
+}
+
+static int impl_node_enum_params(struct spa_node *node, int seq,
+			uint32_t id, uint32_t start, uint32_t num,
+			const struct spa_pod *filter)
+{
+	struct impl *this;
+	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(node != NULL, -EINVAL);
+	spa_return_val_if_fail(num != 0, -EINVAL);
+
+	this = SPA_CONTAINER_OF(node, struct impl, node);
+
+        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:
+	{
+		struct props *p = &this->props;
+
+		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_minLatency),
+				SPA_PROP_INFO_name, SPA_POD_String("The minimum latency"),
+				SPA_PROP_INFO_type, SPA_POD_CHOICE_RANGE_Int(p->min_latency, 1, INT32_MAX));
+			break;
+		case 1:
+			param = spa_pod_builder_add_object(&b,
+				SPA_TYPE_OBJECT_PropInfo, id,
+				SPA_PROP_INFO_id,   SPA_POD_Id(SPA_PROP_maxLatency),
+				SPA_PROP_INFO_name, SPA_POD_String("The maximum latency"),
+				SPA_PROP_INFO_type, SPA_POD_CHOICE_RANGE_Int(p->max_latency, 1, INT32_MAX));
+			break;
+		default:
+			return 0;
+		}
+		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_minLatency, SPA_POD_Int(p->min_latency),
+				SPA_PROP_maxLatency, SPA_POD_Int(p->max_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, &result);
+
+	if (++count != num)
+		goto next;
+
+	return 0;
+}
+
+static int impl_node_set_io(struct spa_node *node, uint32_t id, void *data, size_t size)
+{
+	return 0;
+}
+
+static int impl_node_set_param(struct spa_node *node, uint32_t id, uint32_t flags,
+			       const struct spa_pod *param)
+{
+	struct impl *this;
+
+	spa_return_val_if_fail(node != NULL, -EINVAL);
+
+	this = SPA_CONTAINER_OF(node, struct impl, node);
+
+	switch (id) {
+	case SPA_PARAM_Props:
+	{
+		struct props *p = &this->props;
+
+		if (param == NULL) {
+			reset_props(p);
+			return 0;
+		}
+		spa_pod_parse_object(param,
+			SPA_TYPE_OBJECT_Props, NULL,
+			SPA_PROP_minLatency, SPA_POD_OPT_Int(&p->min_latency),
+			SPA_PROP_maxLatency, SPA_POD_OPT_Int(&p->max_latency));
+		break;
+	}
+	default:
+		return -ENOENT;
+	}
+
+	return 0;
+}
+
+static void reset_buffers(struct impl *this)
+{
+	uint32_t i;
+
+	spa_list_init(&this->free);
+	spa_list_init(&this->ready);
+
+	for (i = 0; i < this->n_buffers; i++) {
+		struct buffer *b = &this->buffers[i];
+		spa_list_append(&this->free, &b->link);
+		b->outstanding = true;
+	}
+}
+
+static void decode_sbc_data(struct impl *this, uint8_t *src, size_t src_size)
+{
+	const ssize_t header_size = sizeof(struct rtp_header) + sizeof(struct rtp_payload);
+	struct buffer *buffer;
+	struct spa_data *data;
+	uint8_t *dest;
+	size_t decoded, dest_size, written;
+
+	/* skip the header */
+	src += header_size;
+	src_size -= header_size;
+	if (src_size <= 0) {
+		spa_log_error(this->log, "not valid header found. dropping data...");
+		return;
+	}
+
+	/* check if we have a new buffer */
+	if (spa_list_is_empty(&this->free)) {
+		spa_log_warn(this->log, "no more buffers available, dropping data...");
+		return;
+	}
+
+	/* get the buffer */
+	buffer = spa_list_first(&this->free, struct buffer, link);
+
+	/* remove the the buffer from the list */
+        spa_list_remove(&buffer->link);
+
+        /* ppdate the outstanding flag */
+        buffer->outstanding = false;
+
+	/* set the header */
+	if (buffer->h) {
+		buffer->h->seq = this->sample_count;
+		buffer->h->pts = SPA_TIMESPEC_TO_NSEC(&this->now);
+		buffer->h->dts_offset = 0;
+	}
+
+	/* get the dest data values */
+	data = buffer->buf->datas;
+	dest = data[0].data;
+	dest_size = data[0].maxsize;
+
+	/* decode the source data */
+	spa_log_debug(this->log, "decoding data for buffer_id=%d", buffer->id);
+	while (src_size > 0 && dest_size > 0) {
+		decoded = sbc_decode(&this->sbc,
+			src, src_size,
+			dest, dest_size, &written);
+		if (decoded <= 0) {
+			printf ("Decoding error. Exiting...\n");
+			exit(-1);
+		}
+
+		/* update source and dest pointers */
+		src_size -= decoded;
+		src += decoded;
+		dest_size -= written;
+		dest += written;
+	}
+
+	/* make sure all data has been decoded */
+	spa_assert(src_size <= 0);
+
+	/* set the decoded data */
+	data[0].chunk->offset = 0;
+	data[0].chunk->size = data[0].maxsize - dest_size;
+	data[0].chunk->stride = this->frame_size;
+
+        /* update the sample count */
+        this->sample_count += data[0].chunk->size / this->frame_size;
+
+        /* add the buffer to the queue */
+        spa_log_debug(this->log, "data decoded successfully for buffer_id=%d", buffer->id);
+        spa_list_append(&this->ready, &buffer->link);
+        this->callbacks->ready(this->callbacks_data, SPA_STATUS_HAVE_BUFFER);
+}
+
+static void a2dp_on_ready_read(struct spa_source *source)
+{
+	struct impl *this = source->data;
+	const ssize_t buffer_size = sizeof(this->buffer_read);
+	ssize_t size_read;
+
+	/* make sure the source is an input */
+	if ((source->rmask & SPA_IO_IN) == 0) {
+		spa_log_error(this->log, "source is not an input, rmask=%d", source->rmask);
+		goto stop;
+	}
+
+	/* update the current pts */
+	clock_gettime(CLOCK_MONOTONIC, &this->now);
+
+again:
+	/* read data from socket */
+	spa_log_debug(this->log, "reading socket data");
+	size_read = read(this->transport->fd, this->buffer_read, buffer_size);
+	if (size_read < 0) {
+		/* retry if interrumpted */
+		if (errno == EINTR)
+			goto again;
+
+		/* return socked has no data */
+		if (errno == EAGAIN || errno == EWOULDBLOCK)
+		    return;
+
+		/* go to 'stop' if socket has an error */
+		spa_log_error(this->log, "read error: %s", strerror(errno));
+		goto stop;
+	}
+
+	/* make sure size_read is not bigger than the buffer_size */
+	spa_assert(size_read <= buffer_size);
+
+	/* decode the data */
+	decode_sbc_data(this, this->buffer_read, size_read);
+
+	/* done reading */
+	return;
+
+stop:
+	if (this->source.loop)
+		spa_loop_remove_source(this->data_loop, &this->source);
+}
+
+static int do_start(struct impl *this)
+{
+	int res, val;
+
+	if (this->started)
+		return 0;
+
+	spa_log_debug(this->log, "a2dp-source %p: start", this);
+
+	if ((res = this->transport->acquire(this->transport, false)) < 0)
+		return res;
+
+	sbc_init_a2dp(&this->sbc, 0, this->transport->configuration,
+		this->transport->configuration_len);
+
+	val = FILL_FRAMES * this->transport->write_mtu;
+	if (setsockopt(this->transport->fd, SOL_SOCKET, SO_SNDBUF, &val, sizeof(val)) < 0)
+		spa_log_warn(this->log, "a2dp-source %p: SO_SNDBUF %m", this);
+
+	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, "a2dp-source %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_buffers(this);
+
+	this->source.data = this;
+	this->source.fd = this->transport->fd;
+	this->source.func = a2dp_on_ready_read;
+	this->source.mask = SPA_IO_IN;
+	this->source.rmask = 0;
+	spa_loop_add_source(this->data_loop, &this->source);
+
+	this->sample_count = 0;
+	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;
+
+	if (this->source.loop)
+		spa_loop_remove_source(this->data_loop, &this->source);
+
+	return 0;
+}
+
+static int do_stop(struct impl *this)
+{
+	int res;
+
+	if (!this->started)
+		return 0;
+
+	spa_log_debug(this->log, "a2dp-source %p: stop", this);
+
+	spa_loop_invoke(this->data_loop, do_remove_source, 0, NULL, 0, true, this);
+
+	this->started = false;
+
+	res = this->transport->release(this->transport);
+
+	sbc_finish(&this->sbc);
+
+	return res;
+}
+
+static int impl_node_send_command(struct spa_node *node, const struct spa_command *command)
+{
+	struct impl *this;
+	int res;
+
+	spa_return_val_if_fail(node != NULL, -EINVAL);
+	spa_return_val_if_fail(command != NULL, -EINVAL);
+
+	this = SPA_CONTAINER_OF(node, struct impl, node);
+
+	switch (SPA_NODE_COMMAND_ID(command)) {
+	case SPA_NODE_COMMAND_Start:
+		if (!this->have_format)
+			return -EIO;
+		if (this->n_buffers == 0)
+			return -EIO;
+
+		if ((res = do_start(this)) < 0)
+			return res;
+		break;
+	case SPA_NODE_COMMAND_Pause:
+		if ((res = do_stop(this)) < 0)
+			return res;
+		break;
+	default:
+		return -ENOTSUP;
+	}
+	return 0;
+}
+
+static const struct spa_dict_item node_info_items[] = {
+	{ "media.class", "Audio/Source" },
+	{ "node.driver", "true" },
+};
+
+static void emit_node_info(struct impl *this, bool full)
+{
+	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->port_info.change_mask = 0;
+	}
+}
+
+static void emit_port_info(struct impl *this, bool full)
+{
+	if (full)
+		this->port_info.change_mask = this->port_info_all;
+	if (this->port_info.change_mask) {
+		spa_node_emit_port_info(&this->hooks,
+				SPA_DIRECTION_OUTPUT, 0, &this->port_info);
+		this->port_info.change_mask = 0;
+	}
+}
+
+static int
+impl_node_add_listener(struct spa_node *node,
+		struct spa_hook *listener,
+		const struct spa_node_events *events,
+		void *data)
+{
+	struct impl *this;
+	struct spa_hook_list save;
+
+	spa_return_val_if_fail(node != NULL, -EINVAL);
+
+	this = SPA_CONTAINER_OF(node, struct impl, node);
+	spa_hook_list_isolate(&this->hooks, &save, listener, events, data);
+
+	emit_node_info(this, true);
+	emit_port_info(this, true);
+
+	spa_hook_list_join(&this->hooks, &save);
+
+	return 0;
+}
+
+static int
+impl_node_set_callbacks(struct spa_node *node,
+			const struct spa_node_callbacks *callbacks,
+			void *data)
+{
+	struct impl *this;
+
+	spa_return_val_if_fail(node != NULL, -EINVAL);
+
+	this = SPA_CONTAINER_OF(node, struct impl, node);
+
+	this->callbacks = callbacks;
+	this->callbacks_data = data;
+
+	return 0;
+}
+
+static int impl_node_add_port(struct spa_node *node, enum spa_direction direction, uint32_t port_id,
+		const struct spa_dict *props)
+{
+	return -ENOTSUP;
+}
+
+static int impl_node_remove_port(struct spa_node *node, enum spa_direction direction, uint32_t port_id)
+{
+	return -ENOTSUP;
+}
+
+static int
+impl_node_port_enum_params(struct spa_node *node, 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;
+	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(node != NULL, -EINVAL);
+	spa_return_val_if_fail(num != 0, -EINVAL);
+
+	this = SPA_CONTAINER_OF(node, struct impl, node);
+
+	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;
+
+		switch (this->transport->codec) {
+		case A2DP_CODEC_SBC:
+		{
+			a2dp_sbc_t *config = this->transport->configuration;
+			struct spa_audio_info_raw info = { 0, };
+
+			info.format = SPA_AUDIO_FORMAT_S16;
+			if ((info.rate = a2dp_sbc_get_frequency(config)) < 0)
+				return -EIO;
+			if ((info.channels = a2dp_sbc_get_channels(config)) < 0)
+				return -EIO;
+
+			switch (info.channels) {
+			case 1:
+				info.position[0] = SPA_AUDIO_CHANNEL_MONO;
+				break;
+			case 2:
+				info.position[0] = SPA_AUDIO_CHANNEL_FL;
+				info.position[1] = SPA_AUDIO_CHANNEL_FR;
+				break;
+			default:
+				return -EIO;
+			}
+
+			param = spa_format_audio_raw_build(&b, id, &info);
+			break;
+		}
+		case A2DP_CODEC_MPEG24:
+		{
+			/* not implemented yet */
+			spa_log_error(this->log, "a2dp mpeg24 codec not implemented yet");
+			return -EIO;
+		}
+		default:
+			return -EIO;
+		}
+		break;
+
+	case SPA_PARAM_Format:
+		if (!this->have_format)
+			return -EIO;
+		if (result.index > 0)
+			return 0;
+
+		param = spa_format_audio_raw_build(&b, id, &this->current_format.info.raw);
+		break;
+
+	case SPA_PARAM_Buffers:
+		if (!this->have_format)
+			return -EIO;
+		if (result.index > 0)
+			return 0;
+
+		param = spa_pod_builder_add_object(&b,
+			SPA_TYPE_OBJECT_ParamBuffers, id,
+			/* 8 buffers are enough to make sure we always have one available when decoding */
+			SPA_PARAM_BUFFERS_buffers, SPA_POD_CHOICE_RANGE_Int(8, 8, MAX_BUFFERS),
+			SPA_PARAM_BUFFERS_blocks,  SPA_POD_Int(1),
+			SPA_PARAM_BUFFERS_size,    SPA_POD_Int(this->props.max_latency * this->frame_size),
+			SPA_PARAM_BUFFERS_stride,  SPA_POD_Int(this->frame_size),
+			SPA_PARAM_BUFFERS_align,   SPA_POD_Int(16));
+		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;
+
+	default:
+		return -ENOENT;
+	}
+
+	/* TODO: why filer is != NULL when linking it with a2dp-sink? */
+	/* if filter is null a2dp-source cannot be linked with a2dp-sink,
+	 * so for now we always pass NULL */
+	if (spa_pod_filter(&b, &result.param, param, NULL) < 0)
+		goto next;
+
+	spa_node_emit_result(&this->hooks, seq, 0, &result);
+
+	if (++count != num)
+		goto next;
+
+	return 0;
+}
+
+static int clear_buffers(struct impl *this)
+{
+	do_stop(this);
+	if (this->n_buffers > 0) {
+		spa_list_init(&this->free);
+		spa_list_init(&this->ready);
+		this->n_buffers = 0;
+	}
+	return 0;
+}
+
+static int port_set_format(struct spa_node *node,
+			   enum spa_direction direction, uint32_t port_id,
+			   uint32_t flags,
+			   const struct spa_pod *format)
+{
+	struct impl *this = SPA_CONTAINER_OF(node, struct impl, node);
+	int err;
+
+	if (format == NULL) {
+		spa_log_info(this->log, "clear format");
+		clear_buffers(this);
+		this->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;
+
+		this->frame_size = info.info.raw.channels * 2;
+		this->current_format = info;
+		this->have_format = true;
+	}
+
+	return 0;
+}
+
+static int
+impl_node_port_set_param(struct spa_node *node,
+			 enum spa_direction direction, uint32_t port_id,
+			 uint32_t id, uint32_t flags,
+			 const struct spa_pod *param)
+{
+	spa_return_val_if_fail(node != NULL, -EINVAL);
+
+	spa_return_val_if_fail(CHECK_PORT(node, direction, port_id), -EINVAL);
+
+	if (id == SPA_PARAM_Format) {
+		return port_set_format(node, direction, port_id, flags, param);
+	}
+	else
+		return -ENOENT;
+}
+
+static int
+impl_node_port_use_buffers(struct spa_node *node,
+			   enum spa_direction direction,
+			   uint32_t port_id, struct spa_buffer **buffers, uint32_t n_buffers)
+{
+	struct impl *this;
+	uint32_t i;
+
+	spa_return_val_if_fail(node != NULL, -EINVAL);
+
+	this = SPA_CONTAINER_OF(node, struct impl, node);
+
+	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+
+	spa_log_info(this->log, "use buffers %d", n_buffers);
+
+	if (!this->have_format)
+		return -EIO;
+
+	clear_buffers(this);
+
+	for (i = 0; i < n_buffers; i++) {
+		struct buffer *b = &this->buffers[i];
+		struct spa_data *d = buffers[i]->datas;
+
+		b->buf = buffers[i];
+		b->id = i;
+		b->outstanding = true;
+
+		b->h = spa_buffer_find_meta_data(buffers[i], SPA_META_Header, sizeof(*b->h));
+
+		if (!((d[0].type == SPA_DATA_MemFd ||
+		       d[0].type == SPA_DATA_DmaBuf ||
+		       d[0].type == SPA_DATA_MemPtr) && d[0].data != NULL)) {
+			spa_log_error(this->log, NAME " %p: need mapped memory", this);
+			return -EINVAL;
+		}
+		spa_list_append(&this->free, &b->link);
+	}
+	this->n_buffers = n_buffers;
+
+	return 0;
+}
+
+static int
+impl_node_port_alloc_buffers(struct spa_node *node,
+			     enum spa_direction direction,
+			     uint32_t port_id,
+			     struct spa_pod **params,
+			     uint32_t n_params,
+			     struct spa_buffer **buffers,
+			     uint32_t *n_buffers)
+{
+	struct impl *this;
+
+	spa_return_val_if_fail(node != NULL, -EINVAL);
+	spa_return_val_if_fail(buffers != NULL, -EINVAL);
+
+	this = SPA_CONTAINER_OF(node, struct impl, node);
+
+	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+
+	if (!this->have_format)
+		return -EIO;
+
+	return -ENOTSUP;
+}
+
+static int
+impl_node_port_set_io(struct spa_node *node,
+		      enum spa_direction direction,
+		      uint32_t port_id,
+		      uint32_t id,
+		      void *data, size_t size)
+{
+	struct impl *this;
+
+	spa_return_val_if_fail(node != NULL, -EINVAL);
+
+	this = SPA_CONTAINER_OF(node, struct impl, node);
+
+	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+
+	switch (id) {
+	case SPA_IO_Buffers:
+		this->io = data;
+		break;
+	default:
+		return -ENOENT;
+	}
+	return 0;
+}
+
+static void recycle_buffer(struct impl *this, uint32_t buffer_id)
+{
+	struct buffer *b = &this->buffers[buffer_id];
+
+	if (!b->outstanding) {
+		spa_log_trace(this->log, NAME " %p: recycle buffer %u", this, buffer_id);
+		spa_list_append(&this->free, &b->link);
+		b->outstanding = true;
+	}
+}
+
+static int impl_node_port_reuse_buffer(struct spa_node *node, uint32_t port_id, uint32_t buffer_id)
+{
+	struct impl *this;
+
+	spa_return_val_if_fail(node != NULL, -EINVAL);
+
+	this = SPA_CONTAINER_OF(node, struct impl, node);
+
+	spa_return_val_if_fail(port_id == 0, -EINVAL);
+
+	if (this->n_buffers == 0)
+		return -EIO;
+
+	if (buffer_id >= this->n_buffers)
+		return -EINVAL;
+
+	recycle_buffer(this, buffer_id);
+
+	return 0;
+}
+
+static int impl_node_process(struct spa_node *node)
+{
+	struct impl *this;
+	struct spa_io_buffers *io;
+	struct buffer *b;
+
+	/* get IO */
+	spa_return_val_if_fail(node != NULL, -EINVAL);
+	this = SPA_CONTAINER_OF(node, struct impl, node);
+	io = this->io;
+	spa_return_val_if_fail(io != NULL, -EIO);
+
+	/* don't do anything if IO does not need a buffer */
+	if (io->status != SPA_STATUS_NEED_BUFFER)
+		return io->status;
+
+	/* Recycle previously played buffer */
+	if (io->buffer_id != SPA_ID_INVALID &&
+	    io->buffer_id < this->n_buffers) {
+		spa_log_debug(this->log, "recycling buffer_id=%d", io->buffer_id);
+		recycle_buffer(this, io->buffer_id);
+		io->buffer_id = SPA_ID_INVALID;
+	}
+
+	/* Check if we have new buffers in the queue */
+	if (spa_list_is_empty(&this->ready))
+		return SPA_STATUS_OK;
+
+	/* Pop the new buffer from the queue */
+	b = spa_list_first(&this->ready, struct buffer, link);
+	spa_list_remove(&b->link);
+
+	/* Set the new buffer in IO to be played */
+	io->buffer_id = b->id;
+	io->status = SPA_STATUS_HAVE_BUFFER;
+	return SPA_STATUS_HAVE_BUFFER;
+}
+
+static const struct spa_node impl_node = {
+	SPA_VERSION_NODE,
+	.add_listener = impl_node_add_listener,
+	.set_callbacks = impl_node_set_callbacks,
+	.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_alloc_buffers = impl_node_port_alloc_buffers,
+	.port_set_io = impl_node_port_set_io,
+	.port_reuse_buffer = impl_node_port_reuse_buffer,
+	.process = impl_node_process,
+};
+
+static int impl_get_interface(struct spa_handle *handle, uint32_t 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 (type == SPA_TYPE_INTERFACE_Node)
+		*interface = &this->node;
+	else
+		return -ENOENT;
+
+	return 0;
+}
+
+static int impl_clear(struct spa_handle *handle)
+{
+	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;
+	uint32_t i;
+
+	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;
+
+	for (i = 0; i < n_support; i++) {
+		if (support[i].type == SPA_TYPE_INTERFACE_Log)
+			this->log = support[i].data;
+		else if (support[i].type == SPA_TYPE_INTERFACE_DataLoop)
+			this->data_loop = support[i].data;
+		else if (support[i].type == SPA_TYPE_INTERFACE_MainLoop)
+			this->main_loop = support[i].data;
+	}
+	if (this->data_loop == NULL) {
+		spa_log_error(this->log, "a data loop is needed");
+		return -EINVAL;
+	}
+	if (this->main_loop == NULL) {
+		spa_log_error(this->log, "a main loop is needed");
+		return -EINVAL;
+	}
+
+	this->node = impl_node;
+	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[0] = SPA_PARAM_INFO(SPA_PARAM_PropInfo, SPA_PARAM_INFO_READ);
+	this->params[1] = SPA_PARAM_INFO(SPA_PARAM_Props, SPA_PARAM_INFO_READWRITE);
+	this->info.params = this->params;
+	this->info.n_params = 2;
+
+	/* set the port info */
+	this->port_info_all = SPA_PORT_CHANGE_MASK_FLAGS |
+			SPA_PORT_CHANGE_MASK_PARAMS;
+	this->port_info = SPA_PORT_INFO_INIT();
+	this->port_info.change_mask = SPA_PORT_CHANGE_MASK_FLAGS;
+	this->port_info.flags = SPA_PORT_FLAG_CAN_USE_BUFFERS |
+			   SPA_PORT_FLAG_LIVE |
+			   SPA_PORT_FLAG_TERMINAL;
+	this->port_params[0] = SPA_PARAM_INFO(SPA_PARAM_EnumFormat, SPA_PARAM_INFO_READ);
+	this->port_params[1] = SPA_PARAM_INFO(SPA_PARAM_Meta, SPA_PARAM_INFO_READ);
+	this->port_params[2] = SPA_PARAM_INFO(SPA_PARAM_IO, SPA_PARAM_INFO_READ);
+	this->port_params[3] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
+	this->port_params[4] = SPA_PARAM_INFO(SPA_PARAM_Buffers, 0);
+	this->port_info.params = this->port_params;
+	this->port_info.n_params = 5;
+
+	/* Init the buffer lists */
+	spa_list_init(&this->ready);
+	spa_list_init(&this->free);
+
+	for (i = 0; info && i < info->n_items; i++) {
+		if (strcmp(info->items[i].key, "bluez5.transport") == 0)
+			sscanf(info->items[i].value, "%p", &this->transport);
+	}
+	if (this->transport == NULL) {
+		spa_log_error(this->log, "a transport is needed");
+		return -EINVAL;
+	}
+	if (this->transport->codec != A2DP_CODEC_SBC) {
+		spa_log_error(this->log, "codec != SBC not yet supported");
+		return -EINVAL;
+	}
+
+	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[] = {
+	{ "factory.author", "Collabora Ltd. <contact@collabora.com>" },
+	{ "factory.description", "Capture bluetooth audio with a2dp" },
+};
+
+static const struct spa_dict info = SPA_DICT_INIT_ARRAY(info_items);
+
+struct spa_handle_factory spa_a2dp_source_factory = {
+	SPA_VERSION_HANDLE_FACTORY,
+	NAME,
+	&info,
+	impl_get_size,
+	impl_init,
+	impl_enum_interface_info,
+};
\ No newline at end of file