Adding upstream version 0.3.65.upstream/0.3.65upstream

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

1 files changed, 1001 insertions, 0 deletions

diff --git a/spa/plugins/support/null-audio-sink.c b/spa/plugins/support/null-audio-sink.c
new file mode 100644
index 0000000..e5b9f04
--- /dev/null
+++ b/spa/plugins/support/null-audio-sink.c
@@ -0,0 +1,1001 @@
+/* Spa
+ *
+ * Copyright © 2020 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 <errno.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdio.h>
+
+#include <spa/support/plugin.h>
+#include <spa/support/log.h>
+#include <spa/support/system.h>
+#include <spa/support/loop.h>
+#include <spa/utils/list.h>
+#include <spa/utils/keys.h>
+#include <spa/utils/json.h>
+#include <spa/utils/result.h>
+#include <spa/utils/string.h>
+#include <spa/node/node.h>
+#include <spa/node/utils.h>
+#include <spa/node/io.h>
+#include <spa/node/keys.h>
+#include <spa/param/audio/format-utils.h>
+#include <spa/debug/types.h>
+#include <spa/debug/mem.h>
+#include <spa/param/audio/type-info.h>
+#include <spa/param/param.h>
+#include <spa/pod/filter.h>
+#include <spa/control/control.h>
+
+#define NAME "null-audio-sink"
+
+#define DEFAULT_CLOCK_NAME	"clock.system.monotonic"
+
+struct props {
+	uint32_t channels;
+	uint32_t rate;
+	uint32_t n_pos;
+	uint32_t pos[SPA_AUDIO_MAX_CHANNELS];
+	char clock_name[64];
+	unsigned int debug:1;
+};
+
+static void reset_props(struct props *props)
+{
+	props->channels = 0;
+	props->rate = 0;
+	props->n_pos = 0;
+	strncpy(props->clock_name, DEFAULT_CLOCK_NAME, sizeof(props->clock_name));
+	props->debug = false;
+}
+
+#define DEFAULT_CHANNELS	2
+#define DEFAULT_RATE		48000
+
+#define MAX_BUFFERS	16
+#define MAX_PORTS	1
+
+struct buffer {
+	uint32_t id;
+#define BUFFER_FLAG_OUT	(1<<0)
+	uint32_t flags;
+	struct spa_buffer *outbuf;
+};
+
+struct impl;
+
+struct port {
+	uint64_t info_all;
+	struct spa_port_info info;
+	struct spa_param_info params[5];
+
+	struct spa_io_buffers *io;
+
+	bool have_format;
+	struct spa_audio_info current_format;
+	uint32_t blocks;
+	size_t bpf;
+
+	struct buffer buffers[MAX_BUFFERS];
+	uint32_t n_buffers;
+};
+
+struct impl {
+	struct spa_handle handle;
+	struct spa_node node;
+
+	struct spa_log *log;
+	struct spa_loop *data_loop;
+	struct spa_system *data_system;
+
+	uint32_t quantum_limit;
+
+	struct props props;
+
+	uint64_t info_all;
+	struct spa_node_info info;
+	struct spa_param_info params[2];
+	struct spa_io_clock *clock;
+	struct spa_io_position *position;
+
+	struct spa_hook_list hooks;
+	struct spa_callbacks callbacks;
+
+	struct port port;
+
+	unsigned int started:1;
+	unsigned int following:1;
+	struct spa_source timer_source;
+	struct itimerspec timerspec;
+	uint64_t next_time;
+};
+
+#define CHECK_PORT(this,d,p)  ((d) == SPA_DIRECTION_INPUT && (p) < MAX_PORTS)
+
+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_IO:
+	{
+		switch (result.index) {
+		case 0:
+			param = spa_pod_builder_add_object(&b,
+					SPA_TYPE_OBJECT_ParamIO, id,
+					SPA_PARAM_IO_id,	SPA_POD_Id(SPA_IO_Clock),
+					SPA_PARAM_IO_size,	SPA_POD_Int(sizeof(struct spa_io_clock)));
+			break;
+		case 1:
+			param = spa_pod_builder_add_object(&b,
+					SPA_TYPE_OBJECT_ParamIO, id,
+					SPA_PARAM_IO_id,	SPA_POD_Id(SPA_IO_Position),
+					SPA_PARAM_IO_size,	SPA_POD_Int(sizeof(struct spa_io_position)));
+			break;
+		default:
+			return 0;
+		}
+		break;
+	}
+	default:
+		return -ENOENT;
+	}
+
+	if (spa_pod_filter(&b, &result.param, param, filter) < 0)
+		goto next;
+
+	spa_node_emit_result(&this->hooks, seq, 0, SPA_RESULT_TYPE_NODE_PARAMS, &result);
+
+	if (++count != num)
+		goto next;
+
+	return 0;
+}
+
+static void set_timeout(struct impl *this, uint64_t next_time)
+{
+	spa_log_trace(this->log, "set timeout %"PRIu64, next_time);
+	this->timerspec.it_value.tv_sec = next_time / SPA_NSEC_PER_SEC;
+	this->timerspec.it_value.tv_nsec = next_time % SPA_NSEC_PER_SEC;
+	spa_system_timerfd_settime(this->data_system,
+			this->timer_source.fd, SPA_FD_TIMER_ABSTIME, &this->timerspec, NULL);
+}
+
+static int set_timers(struct impl *this)
+{
+	struct timespec now;
+	int res;
+
+	if ((res = spa_system_clock_gettime(this->data_system, CLOCK_MONOTONIC, &now)) < 0)
+	    return res;
+	this->next_time = SPA_TIMESPEC_TO_NSEC(&now);
+
+	if (this->following) {
+		set_timeout(this, 0);
+	} else {
+		set_timeout(this, this->next_time);
+	}
+	return 0;
+}
+
+static inline bool is_following(struct impl *this)
+{
+	return this->position && this->clock && this->position->clock.id != this->clock->id;
+}
+
+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 int reassign_follower(struct impl *this)
+{
+	bool following;
+
+	if (!this->started)
+		return 0;
+
+	following = is_following(this);
+	if (following != this->following) {
+		spa_log_debug(this->log, NAME" %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 int impl_node_set_io(void *object, uint32_t id, void *data, size_t size)
+{
+	struct impl *this = object;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	switch (id) {
+	case SPA_IO_Clock:
+		if (size > 0 && size < sizeof(struct spa_io_clock))
+			return -EINVAL;
+		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;
+	}
+	reassign_follower(this);
+
+	return 0;
+}
+
+static void on_timeout(struct spa_source *source)
+{
+	struct impl *this = source->data;
+	uint64_t expirations, nsec, duration = 10;
+	uint32_t rate;
+	int res;
+
+	spa_log_trace(this->log, "timeout");
+
+	if ((res = spa_system_timerfd_read(this->data_system,
+				this->timer_source.fd, &expirations)) < 0) {
+		if (res != EAGAIN)
+			spa_log_error(this->log, NAME " %p: timerfd error: %s",
+					this, spa_strerror(res));
+		return;
+	}
+
+	nsec = this->next_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 = nsec + duration * SPA_NSEC_PER_SEC / rate;
+
+	if (SPA_LIKELY(this->clock)) {
+		this->clock->nsec = nsec;
+		this->clock->position += duration;
+		this->clock->duration = duration;
+		this->clock->delay = 0;
+		this->clock->rate_diff = 1.0;
+		this->clock->next_nsec = this->next_time;
+	}
+
+	spa_node_call_ready(&this->callbacks, SPA_STATUS_NEED_DATA);
+
+	set_timeout(this, this->next_time);
+}
+
+static int do_start(struct impl *this)
+{
+	if (this->started)
+		return 0;
+
+	this->following = is_following(this);
+	set_timers(this);
+	this->started = true;
+	return 0;
+}
+
+static int do_stop(struct impl *this)
+{
+	if (!this->started)
+		return 0;
+	this->started = false;
+	set_timeout(this, 0);
+	return 0;
+}
+
+static int impl_node_send_command(void *object, const struct spa_command *command)
+{
+	struct impl *this = object;
+	struct port *port;
+
+	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;
+
+		do_start(this);
+		break;
+	}
+	case SPA_NODE_COMMAND_Suspend:
+	case SPA_NODE_COMMAND_Pause:
+		do_stop(this);
+		break;
+
+	default:
+		return -ENOTSUP;
+	}
+	return 0;
+}
+
+static const struct spa_dict_item node_info_items[] = {
+	{ SPA_KEY_NODE_DRIVER, "true" },
+};
+
+static void emit_node_info(struct impl *this, bool full)
+{
+	uint64_t old = full ? this->info.change_mask : 0;
+	if (full)
+		this->info.change_mask = this->info_all;
+	if (this->info.change_mask) {
+		this->info.props = &SPA_DICT_INIT_ARRAY(node_info_items);
+		spa_node_emit_info(&this->hooks, &this->info);
+		this->info.change_mask = old;
+	}
+}
+
+static 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
+port_enum_formats(struct impl *this,
+		  enum spa_direction direction, uint32_t port_id,
+		  uint32_t index,
+		  struct spa_pod **param,
+		  struct spa_pod_builder *builder)
+{
+	struct spa_pod_frame f[1];
+
+	switch (index) {
+	case 0:
+		spa_pod_builder_push_object(builder, &f[0],
+			SPA_TYPE_OBJECT_Format, SPA_PARAM_EnumFormat);
+		spa_pod_builder_add(builder,
+			SPA_FORMAT_mediaType,      SPA_POD_Id(SPA_MEDIA_TYPE_audio),
+			SPA_FORMAT_mediaSubtype,   SPA_POD_Id(SPA_MEDIA_SUBTYPE_raw),
+			SPA_FORMAT_AUDIO_format,   SPA_POD_CHOICE_ENUM_Id(3,
+								SPA_AUDIO_FORMAT_F32P,
+								SPA_AUDIO_FORMAT_F32P,
+								SPA_AUDIO_FORMAT_F32),
+			0);
+
+		if (this->props.rate != 0) {
+			spa_pod_builder_add(builder,
+				SPA_FORMAT_AUDIO_rate, SPA_POD_Int(this->props.rate),
+				0);
+		} else {
+			spa_pod_builder_add(builder,
+				SPA_FORMAT_AUDIO_rate, SPA_POD_CHOICE_RANGE_Int(DEFAULT_RATE, 1, INT32_MAX),
+				0);
+		}
+		if (this->props.channels != 0) {
+			spa_pod_builder_add(builder,
+				SPA_FORMAT_AUDIO_channels, SPA_POD_Int(this->props.channels),
+				0);
+		} else {
+			spa_pod_builder_add(builder,
+				SPA_FORMAT_AUDIO_channels, SPA_POD_CHOICE_RANGE_Int(DEFAULT_CHANNELS, 1, INT32_MAX),
+				0);
+		}
+		if (this->props.n_pos != 0) {
+			spa_pod_builder_prop(builder, SPA_FORMAT_AUDIO_position, 0);
+			spa_pod_builder_array(builder, sizeof(uint32_t), SPA_TYPE_Id,
+					this->props.n_pos, this->props.pos);
+		}
+		*param = spa_pod_builder_pop(builder, &f[0]);
+		break;
+	default:
+		return 0;
+	}
+	return 1;
+}
+
+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_builder b = { 0 };
+	uint8_t buffer[1024];
+	struct spa_pod *param;
+	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 ((res = port_enum_formats(this, direction, port_id,
+						result.index, &param, &b)) <= 0)
+			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(1, 1, MAX_BUFFERS),
+			SPA_PARAM_BUFFERS_blocks,  SPA_POD_Int(port->blocks),
+			SPA_PARAM_BUFFERS_size,    SPA_POD_CHOICE_RANGE_Int(
+							this->quantum_limit * port->bpf,
+							16 * port->bpf,
+							INT32_MAX),
+			SPA_PARAM_BUFFERS_stride,  SPA_POD_Int(port->bpf));
+		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;
+	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)
+{
+	if (port->n_buffers > 0) {
+		spa_log_info(this->log, NAME " %p: clear buffers", this);
+		port->n_buffers = 0;
+		this->started = false;
+	}
+	return 0;
+}
+
+static int
+port_set_format(struct impl *this,
+		enum spa_direction direction,
+		uint32_t port_id,
+		uint32_t flags,
+		const struct spa_pod *format)
+{
+	int res;
+	struct port *port = &this->port;
+
+	if (format == NULL) {
+		port->have_format = false;
+		clear_buffers(this, port);
+	} else {
+		struct spa_audio_info info = { 0 };
+
+		if ((res = spa_format_parse(format, &info.media_type, &info.media_subtype)) < 0)
+			return res;
+
+		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;
+
+		if (info.info.raw.format == SPA_AUDIO_FORMAT_F32) {
+			port->bpf = 4 * info.info.raw.channels;
+			port->blocks = 1;
+		} else if (info.info.raw.format == SPA_AUDIO_FORMAT_F32P) {
+			port->bpf = 4;
+			port->blocks = info.info.raw.channels;
+		} else
+			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_RATE;
+		port->info.rate = SPA_FRACTION(1, port->current_format.info.raw.rate);
+		port->params[1] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_READWRITE);
+		port->params[3] = SPA_PARAM_INFO(SPA_PARAM_Buffers, SPA_PARAM_INFO_READ);
+	} else {
+		port->params[1] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
+		port->params[3] = 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;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+
+	switch (id) {
+	case SPA_PARAM_Format:
+		return port_set_format(this, direction, port_id, flags, param);
+	default:
+		return -ENOENT;
+	}
+	return 0;
+}
+
+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;
+
+	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;
+		struct spa_data *d = buffers[i]->datas;
+
+		b = &port->buffers[i];
+		b->id = i;
+		b->flags = 0;
+		b->outbuf = buffers[i];
+
+		if (d[0].data == NULL) {
+			spa_log_error(this->log, NAME " %p: invalid memory on buffer %p", this,
+				      buffers[i]);
+			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_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 (io->status != SPA_STATUS_HAVE_DATA)
+		return io->status;
+	if (io->buffer_id >= port->n_buffers) {
+		io->status = -EINVAL;
+		return io->status;
+	}
+	if (this->props.debug) {
+		struct buffer *b;
+		uint32_t i;
+
+		b = &port->buffers[io->buffer_id];
+		for (i = 0; i < b->outbuf->n_datas; i++) {
+			uint32_t offs, size;
+			struct spa_data *d = b->outbuf->datas;
+
+			offs = SPA_MIN(d->chunk->offset, d->maxsize);
+			size = SPA_MIN(d->maxsize - offs, d->chunk->size);
+			spa_debug_mem(i, SPA_PTROFF(d[i].data, offs, void), SPA_MIN(16u, size));;
+		}
+	}
+	io->status = SPA_STATUS_OK;
+	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,
+	.enum_params = impl_node_enum_params,
+	.set_io = impl_node_set_io,
+	.send_command = impl_node_send_command,
+	.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,
+	.process = impl_node_process,
+};
+
+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 do_remove_timer(struct spa_loop *loop, bool async, uint32_t seq, const void *data, size_t size, void *user_data)
+{
+	struct impl *this = user_data;
+	spa_loop_remove_source(this->data_loop, &this->timer_source);
+	return 0;
+}
+
+static int impl_clear(struct spa_handle *handle)
+{
+	struct impl *this;
+
+	spa_return_val_if_fail(handle != NULL, -EINVAL);
+
+	this = (struct impl *) handle;
+
+	spa_loop_invoke(this->data_loop, do_remove_timer, 0, NULL, 0, true, this);
+	spa_system_close(this->data_system, this->timer_source.fd);
+
+	return 0;
+}
+
+static size_t
+impl_get_size(const struct spa_handle_factory *factory,
+	      const struct spa_dict *params)
+{
+	return sizeof(struct impl);
+}
+
+static uint32_t channel_from_name(const char *name)
+{
+	int i;
+	for (i = 0; spa_type_audio_channel[i].name; i++) {
+		if (spa_streq(name, spa_debug_type_short_name(spa_type_audio_channel[i].name)))
+			return spa_type_audio_channel[i].type;
+	}
+	return SPA_AUDIO_CHANNEL_UNKNOWN;
+}
+
+static inline void parse_position(struct impl *this, const char *val, size_t len)
+{
+	struct spa_json it[2];
+	char v[256];
+
+	spa_json_init(&it[0], val, len);
+        if (spa_json_enter_array(&it[0], &it[1]) <= 0)
+                spa_json_init(&it[1], val, len);
+
+	this->props.n_pos = 0;
+	while (spa_json_get_string(&it[1], v, sizeof(v)) > 0 &&
+	    this->props.n_pos < SPA_AUDIO_MAX_CHANNELS) {
+		this->props.pos[this->props.n_pos++] = channel_from_name(v);
+	}
+}
+
+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;
+	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;
+
+	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);
+
+	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;
+	}
+	spa_hook_list_init(&this->hooks);
+
+	this->node.iface = SPA_INTERFACE_INIT(
+			SPA_TYPE_INTERFACE_Node,
+			SPA_VERSION_NODE,
+			&impl_node, this);
+
+	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.max_input_ports = 1;
+	this->info.flags = SPA_NODE_FLAG_RT;
+	this->params[0] = SPA_PARAM_INFO(SPA_PARAM_IO, SPA_PARAM_INFO_READ);
+	this->info.params = this->params;
+	this->info.n_params = 1;
+	reset_props(&this->props);
+
+	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 = SPA_PORT_FLAG_NO_REF |
+			SPA_PORT_FLAG_LIVE;
+	port->params[0] = SPA_PARAM_INFO(SPA_PARAM_EnumFormat, SPA_PARAM_INFO_READ);
+	port->params[1] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
+	port->params[2] = SPA_PARAM_INFO(SPA_PARAM_IO, SPA_PARAM_INFO_READ);
+	port->params[3] = SPA_PARAM_INFO(SPA_PARAM_Buffers, 0);
+	port->info.params = port->params;
+	port->info.n_params = 4;
+
+	this->timer_source.func = on_timeout;
+	this->timer_source.data = this;
+	this->timer_source.fd = spa_system_timerfd_create(this->data_system, CLOCK_MONOTONIC,
+							  SPA_FD_CLOEXEC | SPA_FD_NONBLOCK);
+	this->timer_source.mask = SPA_IO_IN;
+	this->timer_source.rmask = 0;
+	this->timerspec.it_value.tv_sec = 0;
+	this->timerspec.it_value.tv_nsec = 0;
+	this->timerspec.it_interval.tv_sec = 0;
+	this->timerspec.it_interval.tv_nsec = 0;
+
+	spa_loop_add_source(this->data_loop, &this->timer_source);
+
+	for (i = 0; info && i < info->n_items; i++) {
+		const char *k = info->items[i].key;
+		const char *s = info->items[i].value;
+		if (spa_streq(k, "clock.quantum-limit")) {
+			spa_atou32(s, &this->quantum_limit, 0);
+		} else if (spa_streq(k, SPA_KEY_AUDIO_CHANNELS)) {
+			this->props.channels = atoi(s);
+		} else if (spa_streq(k, SPA_KEY_AUDIO_RATE)) {
+			this->props.rate = atoi(s);
+		} else if (spa_streq(k, SPA_KEY_AUDIO_POSITION)) {
+			parse_position(this, s, strlen(s));
+		} else if (spa_streq(k, "clock.name")) {
+			spa_scnprintf(this->props.clock_name,
+					sizeof(this->props.clock_name),
+					"%s", s);
+		}
+	}
+	if (this->props.n_pos > 0)
+		this->props.channels = this->props.n_pos;
+
+	spa_log_info(this->log, NAME " %p: initialized", this);
+
+	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, "Consume audio samples" },
+};
+
+static const struct spa_dict info = SPA_DICT_INIT_ARRAY(info_items);
+
+const struct spa_handle_factory spa_support_null_audio_sink_factory = {
+	SPA_VERSION_HANDLE_FACTORY,
+	"support.null-audio-sink",
+	&info,
+	impl_get_size,
+	impl_init,
+	impl_enum_interface_info,
+};