Adding upstream version 0.3.65.upstream/0.3.65upstream

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

13 files changed, 3340 insertions, 0 deletions

diff --git a/spa/plugins/audiomixer/audiomixer.c b/spa/plugins/audiomixer/audiomixer.c
new file mode 100644
index 0000000..25da978
--- /dev/null
+++ b/spa/plugins/audiomixer/audiomixer.c
@@ -0,0 +1,990 @@
+/* Spa
+ *
+ * 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 <errno.h>
+#include <string.h>
+#include <stdio.h>
+
+#include <spa/support/plugin.h>
+#include <spa/support/log.h>
+#include <spa/support/cpu.h>
+#include <spa/utils/list.h>
+#include <spa/utils/names.h>
+#include <spa/utils/string.h>
+#include <spa/node/node.h>
+#include <spa/node/utils.h>
+#include <spa/node/io.h>
+#include <spa/param/audio/format-utils.h>
+#include <spa/param/param.h>
+#include <spa/pod/filter.h>
+
+#include "mix-ops.h"
+
+#undef SPA_LOG_TOPIC_DEFAULT
+#define SPA_LOG_TOPIC_DEFAULT log_topic
+static struct spa_log_topic *log_topic = &SPA_LOG_TOPIC(0, "spa.audiomixer");
+
+#define DEFAULT_RATE		48000
+#define DEFAULT_CHANNELS	2
+
+#define MAX_BUFFERS     64
+#define MAX_PORTS       128
+#define MAX_CHANNELS    64
+#define MAX_ALIGN	MIX_OPS_MAX_ALIGN
+
+#define PORT_DEFAULT_VOLUME	1.0
+#define PORT_DEFAULT_MUTE	false
+
+struct port_props {
+	double volume;
+	int32_t mute;
+};
+
+static void port_props_reset(struct port_props *props)
+{
+	props->volume = PORT_DEFAULT_VOLUME;
+	props->mute = PORT_DEFAULT_MUTE;
+}
+
+struct buffer {
+	uint32_t id;
+#define BUFFER_FLAG_QUEUED	(1 << 0)
+	uint32_t flags;
+
+	struct spa_list link;
+	struct spa_buffer *buffer;
+	struct spa_meta_header *h;
+	struct spa_buffer buf;
+};
+
+struct port {
+	uint32_t direction;
+	uint32_t id;
+
+	struct port_props props;
+
+	struct spa_io_buffers *io;
+
+	uint64_t info_all;
+	struct spa_port_info info;
+	struct spa_param_info params[8];
+
+	unsigned int valid:1;
+	unsigned int have_format:1;
+
+	struct buffer buffers[MAX_BUFFERS];
+	uint32_t n_buffers;
+
+	struct spa_list queue;
+	size_t queued_bytes;
+};
+
+struct impl {
+	struct spa_handle handle;
+	struct spa_node node;
+
+	struct spa_log *log;
+	struct spa_cpu *cpu;
+	uint32_t cpu_flags;
+	uint32_t max_align;
+	uint32_t quantum_limit;
+
+	struct mix_ops ops;
+
+	uint64_t info_all;
+	struct spa_node_info info;
+	struct spa_param_info params[8];
+
+	struct spa_hook_list hooks;
+
+	uint32_t port_count;
+	uint32_t last_port;
+	struct port *in_ports[MAX_PORTS];
+	struct port out_ports[1];
+
+	int n_formats;
+	struct spa_audio_info format;
+
+	unsigned int have_format:1;
+	unsigned int started:1;
+	uint32_t stride;
+	uint32_t blocks;
+};
+
+#define PORT_VALID(p)                ((p) != NULL && (p)->valid)
+#define CHECK_FREE_IN_PORT(this,d,p) ((d) == SPA_DIRECTION_INPUT && (p) < MAX_PORTS && !PORT_VALID(this->in_ports[(p)]))
+#define CHECK_IN_PORT(this,d,p)      ((d) == SPA_DIRECTION_INPUT && (p) < MAX_PORTS && PORT_VALID(this->in_ports[(p)]))
+#define CHECK_OUT_PORT(this,d,p)     ((d) == SPA_DIRECTION_OUTPUT && (p) == 0)
+#define CHECK_PORT(this,d,p)         (CHECK_OUT_PORT(this,d,p) || CHECK_IN_PORT (this,d,p))
+#define GET_IN_PORT(this,p)          (this->in_ports[p])
+#define GET_OUT_PORT(this,p)         (&this->out_ports[p])
+#define GET_PORT(this,d,p)           (d == SPA_DIRECTION_INPUT ? GET_IN_PORT(this,p) : GET_OUT_PORT(this,p))
+
+static int impl_node_enum_params(void *object, int seq,
+			uint32_t id, uint32_t start, uint32_t num,
+			const struct spa_pod *filter)
+{
+	return -ENOTSUP;
+}
+
+static int impl_node_set_param(void *object, uint32_t id, uint32_t flags,
+			       const struct spa_pod *param)
+{
+	return -ENOTSUP;
+}
+
+static int impl_node_set_io(void *object, uint32_t id, void *data, size_t size)
+{
+	return -ENOTSUP;
+}
+
+static int impl_node_send_command(void *object, const struct spa_command *command)
+{
+	struct impl *this = object;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(command != NULL, -EINVAL);
+
+	switch (SPA_NODE_COMMAND_ID(command)) {
+	case SPA_NODE_COMMAND_Start:
+		this->started = true;
+		break;
+	case SPA_NODE_COMMAND_Pause:
+		this->started = false;
+		break;
+	default:
+		return -ENOTSUP;
+	}
+	return 0;
+}
+
+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) {
+		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,
+				port->direction, port->id, &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;
+	uint32_t i;
+
+	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, GET_OUT_PORT(this, 0), true);
+	for (i = 0; i < this->last_port; i++) {
+		if (PORT_VALID(this->in_ports[i]))
+			emit_port_info(this, GET_IN_PORT(this, i), 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 *user_data)
+{
+	return 0;
+}
+
+static int impl_node_add_port(void *object, enum spa_direction direction, uint32_t port_id,
+		const struct spa_dict *props)
+{
+	struct impl *this = object;
+	struct port *port;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(CHECK_FREE_IN_PORT(this, direction, port_id), -EINVAL);
+
+	port = GET_IN_PORT(this, port_id);
+	if (port == NULL) {
+		port = calloc(1, sizeof(struct port));
+		if (port == NULL)
+			return -errno;
+		this->in_ports[port_id] = port;
+	}
+	port->direction = SPA_DIRECTION_INPUT;
+	port->id = port_id;
+
+	port_props_reset(&port->props);
+
+	spa_list_init(&port->queue);
+	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_DYNAMIC_DATA |
+			   SPA_PORT_FLAG_REMOVABLE |
+			   SPA_PORT_FLAG_OPTIONAL;
+	port->params[0] = SPA_PARAM_INFO(SPA_PARAM_EnumFormat, SPA_PARAM_INFO_READ);
+	port->params[1] = SPA_PARAM_INFO(SPA_PARAM_Meta, SPA_PARAM_INFO_READ);
+	port->params[2] = SPA_PARAM_INFO(SPA_PARAM_IO, SPA_PARAM_INFO_READ);
+	port->params[3] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
+	port->params[4] = SPA_PARAM_INFO(SPA_PARAM_Buffers, 0);
+	port->info.params = port->params;
+	port->info.n_params = 5;
+
+	this->port_count++;
+	if (this->last_port <= port_id)
+		this->last_port = port_id + 1;
+	port->valid = true;
+
+	spa_log_debug(this->log, "%p: add port %d:%d %d", this,
+			direction, port_id, this->last_port);
+	emit_port_info(this, port, true);
+
+	return 0;
+}
+
+static int
+impl_node_remove_port(void *object, enum spa_direction direction, uint32_t port_id)
+{
+	struct impl *this = object;
+	struct port *port;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(CHECK_IN_PORT(this, direction, port_id), -EINVAL);
+
+	port = GET_IN_PORT(this, port_id);
+
+	port->valid = false;
+	this->port_count--;
+	if (port->have_format && this->have_format) {
+		if (--this->n_formats == 0)
+			this->have_format = false;
+	}
+	spa_memzero(port, sizeof(struct port));
+
+	if (port_id + 1 == this->last_port) {
+		int i;
+
+		for (i = this->last_port - 1; i >= 0; i--)
+			if (PORT_VALID(GET_IN_PORT(this, i)))
+				break;
+
+		this->last_port = i + 1;
+	}
+	spa_log_debug(this->log, "%p: remove port %d:%d %d", this,
+			direction, port_id, this->last_port);
+
+	spa_node_emit_port_info(&this->hooks, direction, port_id, NULL);
+
+	return 0;
+}
+
+static int port_enum_formats(void *object,
+			     enum spa_direction direction, uint32_t port_id,
+			     uint32_t index,
+			     struct spa_pod **param,
+			     struct spa_pod_builder *builder)
+{
+	struct impl *this = object;
+
+	switch (index) {
+	case 0:
+		if (this->have_format) {
+			*param = spa_pod_builder_add_object(builder,
+				SPA_TYPE_OBJECT_Format, SPA_PARAM_EnumFormat,
+				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_Id(this->format.info.raw.format),
+				SPA_FORMAT_AUDIO_rate,     SPA_POD_Int(this->format.info.raw.rate),
+				SPA_FORMAT_AUDIO_channels, SPA_POD_Int(this->format.info.raw.channels));
+		} else {
+			*param = spa_pod_builder_add_object(builder,
+				SPA_TYPE_OBJECT_Format, SPA_PARAM_EnumFormat,
+				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_Int(12,
+								SPA_AUDIO_FORMAT_S8,
+								SPA_AUDIO_FORMAT_U8,
+								SPA_AUDIO_FORMAT_S16,
+								SPA_AUDIO_FORMAT_U16,
+								SPA_AUDIO_FORMAT_S24,
+								SPA_AUDIO_FORMAT_U24,
+								SPA_AUDIO_FORMAT_S32,
+								SPA_AUDIO_FORMAT_U32,
+								SPA_AUDIO_FORMAT_S24_32,
+								SPA_AUDIO_FORMAT_U24_32,
+								SPA_AUDIO_FORMAT_F32,
+								SPA_AUDIO_FORMAT_F64),
+				SPA_FORMAT_AUDIO_rate,     SPA_POD_CHOICE_RANGE_Int(
+								DEFAULT_RATE, 1, INT32_MAX),
+				SPA_FORMAT_AUDIO_channels, SPA_POD_CHOICE_RANGE_Int(
+								DEFAULT_CHANNELS, 1, INT32_MAX));
+		}
+		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 *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 = GET_PORT(this, direction, port_id);
+
+	result.id = id;
+	result.next = start;
+      next:
+	result.index = result.next++;
+
+	spa_pod_builder_init(&b, buffer, sizeof(buffer));
+
+	switch (id) {
+	case SPA_PARAM_EnumFormat:
+		if ((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, &this->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(this->blocks),
+			SPA_PARAM_BUFFERS_size,    SPA_POD_CHOICE_RANGE_Int(
+								this->quantum_limit * this->stride,
+								16 * this->stride,
+								INT32_MAX),
+			SPA_PARAM_BUFFERS_stride,  SPA_POD_Int(this->stride));
+		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;
+	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_debug(this->log, "%p: clear buffers %p", this, port);
+		port->n_buffers = 0;
+		spa_list_init(&port->queue);
+	}
+	return 0;
+}
+
+static int queue_buffer(struct impl *this, struct port *port, struct buffer *b)
+{
+	if (SPA_FLAG_IS_SET(b->flags, BUFFER_FLAG_QUEUED))
+		return -EINVAL;
+
+	spa_list_append(&port->queue, &b->link);
+	SPA_FLAG_SET(b->flags, BUFFER_FLAG_QUEUED);
+	spa_log_trace_fp(this->log, "%p: queue buffer %d", this, b->id);
+	return 0;
+}
+
+static struct buffer *dequeue_buffer(struct impl *this, struct port *port)
+{
+	struct buffer *b;
+
+	if (spa_list_is_empty(&port->queue))
+		return NULL;
+
+	b = spa_list_first(&port->queue, struct buffer, link);
+	spa_list_remove(&b->link);
+	SPA_FLAG_CLEAR(b->flags, BUFFER_FLAG_QUEUED);
+	spa_log_trace_fp(this->log, "%p: dequeue buffer %d", this, b->id);
+	return b;
+}
+
+static int calc_width(struct spa_audio_info *info)
+{
+	switch (info->info.raw.format) {
+	case SPA_AUDIO_FORMAT_U8P:
+	case SPA_AUDIO_FORMAT_U8:
+	case SPA_AUDIO_FORMAT_S8P:
+	case SPA_AUDIO_FORMAT_S8:
+	case SPA_AUDIO_FORMAT_ALAW:
+	case SPA_AUDIO_FORMAT_ULAW:
+		return 1;
+	case SPA_AUDIO_FORMAT_S16P:
+	case SPA_AUDIO_FORMAT_S16:
+	case SPA_AUDIO_FORMAT_S16_OE:
+	case SPA_AUDIO_FORMAT_U16:
+		return 2;
+	case SPA_AUDIO_FORMAT_S24P:
+	case SPA_AUDIO_FORMAT_S24:
+	case SPA_AUDIO_FORMAT_S24_OE:
+	case SPA_AUDIO_FORMAT_U24:
+		return 3;
+	case SPA_AUDIO_FORMAT_F64P:
+	case SPA_AUDIO_FORMAT_F64:
+	case SPA_AUDIO_FORMAT_F64_OE:
+		return 8;
+	default:
+		return 4;
+	}
+}
+
+static int port_set_format(void *object,
+			   enum spa_direction direction,
+			   uint32_t port_id,
+			   uint32_t flags,
+			   const struct spa_pod *format)
+{
+	struct impl *this = object;
+	struct port *port;
+	int res;
+
+	port = GET_PORT(this, direction, port_id);
+
+	if (format == NULL) {
+		if (port->have_format) {
+			port->have_format = false;
+			if (--this->n_formats == 0)
+				this->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 (this->have_format) {
+			if (memcmp(&info, &this->format, sizeof(struct spa_audio_info)))
+				return -EINVAL;
+		} else {
+			if (info.info.raw.format == 0 ||
+			    info.info.raw.channels == 0)
+				return -EINVAL;
+
+			this->ops.fmt = info.info.raw.format;
+			this->ops.n_channels = info.info.raw.channels;
+			this->ops.cpu_flags = this->cpu_flags;
+
+			if ((res = mix_ops_init(&this->ops)) < 0)
+				return res;
+
+			this->stride = calc_width(&info);
+
+			if (SPA_AUDIO_FORMAT_IS_PLANAR(info.info.raw.format)) {
+				this->blocks = info.info.raw.channels;
+			} else {
+				this->stride *= info.info.raw.channels;
+				this->blocks = 1;
+			}
+
+			this->have_format = true;
+			this->format = info;
+		}
+		if (!port->have_format) {
+			this->n_formats++;
+			port->have_format = true;
+			spa_log_debug(this->log, "%p: set format on port %d",
+					this, port_id);
+		}
+	}
+	port->info.change_mask |= SPA_PORT_CHANGE_MASK_PARAMS;
+	if (port->have_format) {
+		port->params[3] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_READWRITE);
+		port->params[4] = SPA_PARAM_INFO(SPA_PARAM_Buffers, SPA_PARAM_INFO_READ);
+	} else {
+		port->params[3] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
+		port->params[4] = 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);
+
+	if (id == SPA_PARAM_Format) {
+		return port_set_format(this, direction, port_id, flags, param);
+	}
+	else
+		return -ENOENT;
+}
+
+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_log_debug(this->log, "%p: use %d buffers on port %d:%d",
+			this, n_buffers, direction, port_id);
+
+	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+
+	port = GET_PORT(this, direction, port_id);
+
+	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->buffer = buffers[i];
+		b->flags = 0;
+		b->id = i;
+		b->h = spa_buffer_find_meta_data(buffers[i], SPA_META_Header, sizeof(*b->h));
+		b->buf = *buffers[i];
+
+		if (d[0].data == NULL) {
+			spa_log_error(this->log, "%p: invalid memory on buffer %p", this,
+				      buffers[i]);
+			return -EINVAL;
+		}
+		if (!SPA_IS_ALIGNED(d[0].data, this->max_align)) {
+			spa_log_warn(this->log, "%p: memory on buffer %d not aligned", this, i);
+		}
+		if (direction == SPA_DIRECTION_OUTPUT)
+			queue_buffer(this, port, b);
+
+		spa_log_debug(this->log, "%p: port %d:%d buffer:%d n_data:%d data:%p maxsize:%d",
+				this, direction, port_id, i,
+				buffers[i]->n_datas, d[0].data, d[0].maxsize);
+	}
+	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_log_debug(this->log, "%p: port %d:%d io %d %p/%zd", this,
+			direction, port_id, id, data, size);
+
+	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+
+	port = GET_PORT(this, direction, port_id);
+
+	switch (id) {
+	case SPA_IO_Buffers:
+		port->io = data;
+		break;
+	default:
+		return -ENOENT;
+	}
+	return 0;
+}
+
+static int impl_node_port_reuse_buffer(void *object, uint32_t port_id, uint32_t buffer_id)
+{
+	struct impl *this = object;
+	struct port *port;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(CHECK_PORT(this, SPA_DIRECTION_OUTPUT, port_id), -EINVAL);
+	port = GET_OUT_PORT(this, 0);
+
+	if (buffer_id >= port->n_buffers)
+		return -EINVAL;
+
+	return queue_buffer(this, port, &port->buffers[buffer_id]);
+}
+
+static int impl_node_process(void *object)
+{
+	struct impl *this = object;
+	struct port *outport;
+	struct spa_io_buffers *outio;
+	uint32_t n_buffers, i, maxsize;
+	struct buffer **buffers;
+	struct buffer *outb;
+	const void **datas;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	outport = GET_OUT_PORT(this, 0);
+	if ((outio = outport->io) == NULL)
+		return -EIO;
+
+	spa_log_trace_fp(this->log, "%p: status %p %d %d",
+			this, outio, outio->status, outio->buffer_id);
+
+	if (SPA_UNLIKELY(outio->status == SPA_STATUS_HAVE_DATA))
+		return outio->status;
+
+	/* recycle */
+	if (SPA_LIKELY(outio->buffer_id < outport->n_buffers)) {
+		queue_buffer(this, outport, &outport->buffers[outio->buffer_id]);
+		outio->buffer_id = SPA_ID_INVALID;
+	}
+
+	buffers = alloca(MAX_PORTS * sizeof(struct buffer *));
+        datas = alloca(MAX_PORTS * sizeof(void *));
+        n_buffers = 0;
+
+	maxsize = UINT32_MAX;
+
+	for (i = 0; i < this->last_port; i++) {
+		struct port *inport = GET_IN_PORT(this, i);
+		struct spa_io_buffers *inio = NULL;
+		struct buffer *inb;
+		struct spa_data *bd;
+		uint32_t size, offs;
+
+		if (SPA_UNLIKELY(!PORT_VALID(inport) ||
+		    (inio = inport->io) == NULL ||
+		    inio->buffer_id >= inport->n_buffers ||
+		    inio->status != SPA_STATUS_HAVE_DATA)) {
+			spa_log_trace_fp(this->log, "%p: skip input idx:%d valid:%d "
+					"io:%p status:%d buf_id:%d n_buffers:%d", this,
+				i, PORT_VALID(inport), inio,
+				inio ? inio->status : -1,
+				inio ? inio->buffer_id : SPA_ID_INVALID,
+				inport->n_buffers);
+			continue;
+		}
+
+		inb = &inport->buffers[inio->buffer_id];
+		bd = &inb->buffer->datas[0];
+
+		offs = SPA_MIN(bd->chunk->offset, bd->maxsize);
+		size = SPA_MIN(bd->maxsize - offs, bd->chunk->size);
+		maxsize = SPA_MIN(size, maxsize);
+
+		spa_log_trace_fp(this->log, "%p: mix input %d %p->%p %d %d %d:%d", this,
+				i, inio, outio, inio->status, inio->buffer_id,
+				offs, size);
+
+		if (!SPA_FLAG_IS_SET(bd->chunk->flags, SPA_CHUNK_FLAG_EMPTY)) {
+			datas[n_buffers] = SPA_PTROFF(bd->data, offs, void);
+			buffers[n_buffers++] = inb;
+		}
+		inio->status = SPA_STATUS_NEED_DATA;
+	}
+
+	outb = dequeue_buffer(this, outport);
+        if (SPA_UNLIKELY(outb == NULL)) {
+                spa_log_trace(this->log, "%p: out of buffers", this);
+                return -EPIPE;
+        }
+
+	if (n_buffers == 1) {
+		*outb->buffer = *buffers[0]->buffer;
+	} else {
+		struct spa_data *d = outb->buf.datas;
+
+		*outb->buffer = outb->buf;
+
+		maxsize = SPA_MIN(maxsize, d[0].maxsize);
+
+		d[0].chunk->offset = 0;
+		d[0].chunk->size = maxsize;
+		d[0].chunk->stride = this->stride;
+		SPA_FLAG_UPDATE(d[0].chunk->flags, SPA_CHUNK_FLAG_EMPTY, n_buffers == 0);
+
+		mix_ops_process(&this->ops, d[0].data,
+				datas, n_buffers, maxsize / this->stride);
+	}
+
+	outio->buffer_id = outb->id;
+	outio->status = SPA_STATUS_HAVE_DATA;
+
+	return SPA_STATUS_HAVE_DATA | SPA_STATUS_NEED_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_param = impl_node_set_param,
+	.set_io = impl_node_set_io,
+	.send_command = impl_node_send_command,
+	.add_port = impl_node_add_port,
+	.remove_port = impl_node_remove_port,
+	.port_enum_params = impl_node_port_enum_params,
+	.port_set_param = impl_node_port_set_param,
+	.port_use_buffers = impl_node_port_use_buffers,
+	.port_set_io = impl_node_port_set_io,
+	.port_reuse_buffer = impl_node_port_reuse_buffer,
+	.process = impl_node_process,
+};
+
+static int impl_get_interface(struct spa_handle *handle, const char *type, void **interface)
+{
+	struct 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;
+	uint32_t i;
+
+	spa_return_val_if_fail(handle != NULL, -EINVAL);
+
+	this = (struct impl *) handle;
+
+	for (i = 0; i < MAX_PORTS; i++)
+		free(this->in_ports[i]);
+	mix_ops_free(&this->ops);
+	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;
+	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);
+	spa_log_topic_init(this->log, log_topic);
+
+	this->cpu = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_CPU);
+	if (this->cpu) {
+		this->cpu_flags = spa_cpu_get_flags(this->cpu);
+		this->max_align = SPA_MIN(MAX_ALIGN, spa_cpu_get_max_align(this->cpu));
+	}
+
+	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);
+	}
+
+	spa_hook_list_init(&this->hooks);
+
+	this->node.iface = SPA_INTERFACE_INIT(
+			SPA_TYPE_INTERFACE_Node,
+			SPA_VERSION_NODE,
+			&impl_node, this);
+	this->info = SPA_NODE_INFO_INIT();
+	this->info.max_input_ports = MAX_PORTS;
+	this->info.max_output_ports = 1;
+	this->info.change_mask |= SPA_NODE_CHANGE_MASK_FLAGS;
+	this->info.flags = SPA_NODE_FLAG_RT | SPA_NODE_FLAG_IN_DYNAMIC_PORTS;
+
+	port = GET_OUT_PORT(this, 0);
+	port->valid = true;
+	port->direction = SPA_DIRECTION_OUTPUT;
+	port->id = 0;
+	port->info = SPA_PORT_INFO_INIT();
+	port->info.change_mask |= SPA_PORT_CHANGE_MASK_FLAGS;
+	port->info.flags = SPA_PORT_FLAG_DYNAMIC_DATA;
+	port->info.change_mask |= SPA_PORT_CHANGE_MASK_PARAMS;
+	port->params[0] = SPA_PARAM_INFO(SPA_PARAM_EnumFormat, SPA_PARAM_INFO_READ);
+	port->params[1] = SPA_PARAM_INFO(SPA_PARAM_Meta, SPA_PARAM_INFO_READ);
+	port->params[2] = SPA_PARAM_INFO(SPA_PARAM_IO, SPA_PARAM_INFO_READ);
+	port->params[3] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
+	port->params[4] = SPA_PARAM_INFO(SPA_PARAM_Buffers, 0);
+	port->info.params = port->params;
+	port->info.n_params = 5;
+
+	spa_list_init(&port->queue);
+
+	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;
+}
+
+const struct spa_handle_factory spa_audiomixer_factory = {
+	SPA_VERSION_HANDLE_FACTORY,
+	SPA_NAME_AUDIO_MIXER,
+	NULL,
+	impl_get_size,
+	impl_init,
+	impl_enum_interface_info,
+};
diff --git a/spa/plugins/audiomixer/benchmark-mix-ops.c b/spa/plugins/audiomixer/benchmark-mix-ops.c
new file mode 100644
index 0000000..e698417
--- /dev/null
+++ b/spa/plugins/audiomixer/benchmark-mix-ops.c
@@ -0,0 +1,222 @@
+/* Spa
+ *
+ * Copyright © 2019 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 "config.h"
+
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <time.h>
+
+#include "test-helper.h"
+#include "mix-ops.h"
+
+static uint32_t cpu_flags;
+
+typedef void (*mix_func_t) (struct mix_ops *ops, void * SPA_RESTRICT dst,
+		const void * SPA_RESTRICT src[], uint32_t n_src, uint32_t n_samples);
+struct stats {
+	uint32_t n_samples;
+	uint32_t n_src;
+	uint64_t perf;
+	const char *name;
+	const char *impl;
+};
+
+#define MAX_SAMPLES	4096
+#define MAX_SRC		11
+
+#define MAX_COUNT 100
+
+static uint8_t samp_in[MAX_SAMPLES * MAX_SRC * 8];
+static uint8_t samp_out[MAX_SAMPLES * 8];
+
+static const int sample_sizes[] = { 0, 1, 128, 513, 4096 };
+static const int src_counts[] = { 1, 2, 4, 6, 8, 11 };
+
+#define MAX_RESULTS	SPA_N_ELEMENTS(sample_sizes) * SPA_N_ELEMENTS(src_counts) * 70
+
+static uint32_t n_results = 0;
+static struct stats results[MAX_RESULTS];
+
+static void run_test1(const char *name, const char *impl, mix_func_t func, int n_src, int n_samples)
+{
+	int i, j;
+	const void *ip[n_src];
+	void *op;
+	struct timespec ts;
+	uint64_t count, t1, t2;
+	struct mix_ops mix;
+
+	mix.n_channels = 1;
+
+	for (j = 0; j < n_src; j++)
+		ip[j] = SPA_PTR_ALIGN(&samp_in[j * n_samples * 4], 32, void);
+	op = SPA_PTR_ALIGN(samp_out, 32, void);
+
+	clock_gettime(CLOCK_MONOTONIC, &ts);
+	t1 = SPA_TIMESPEC_TO_NSEC(&ts);
+
+	count = 0;
+	for (i = 0; i < MAX_COUNT; i++) {
+		func(&mix, op, ip, n_src, n_samples);
+		count++;
+	}
+	clock_gettime(CLOCK_MONOTONIC, &ts);
+	t2 = SPA_TIMESPEC_TO_NSEC(&ts);
+
+	spa_assert(n_results < MAX_RESULTS);
+
+	results[n_results++] = (struct stats) {
+		.n_samples = n_samples,
+		.n_src = n_src,
+		.perf = count * (uint64_t)SPA_NSEC_PER_SEC / (t2 - t1),
+		.name = name,
+		.impl = impl
+	};
+}
+
+static void run_test(const char *name, const char *impl, mix_func_t func)
+{
+	size_t i, j;
+
+	for (i = 0; i < SPA_N_ELEMENTS(sample_sizes); i++) {
+		for (j = 0; j < SPA_N_ELEMENTS(src_counts); j++) {
+			run_test1(name, impl, func, src_counts[j],
+				(sample_sizes[i] + (src_counts[j] -1)) / src_counts[j]);
+		}
+	}
+}
+
+static void test_s8(void)
+{
+	run_test("test_s8", "c", mix_s8_c);
+}
+static void test_u8(void)
+{
+	run_test("test_u8", "c", mix_u8_c);
+}
+
+static void test_s16(void)
+{
+	run_test("test_s16", "c", mix_s16_c);
+}
+static void test_u16(void)
+{
+	run_test("test_u8", "c", mix_u16_c);
+}
+
+static void test_s24(void)
+{
+	run_test("test_s24", "c", mix_s24_c);
+}
+static void test_u24(void)
+{
+	run_test("test_u24", "c", mix_u24_c);
+}
+static void test_s24_32(void)
+{
+	run_test("test_s24_32", "c", mix_s24_32_c);
+}
+static void test_u24_32(void)
+{
+	run_test("test_u24_32", "c", mix_u24_32_c);
+}
+
+static void test_s32(void)
+{
+	run_test("test_s32", "c", mix_s32_c);
+}
+static void test_u32(void)
+{
+	run_test("test_u32", "c", mix_u32_c);
+}
+
+static void test_f32(void)
+{
+	run_test("test_f32", "c", mix_f32_c);
+#if defined (HAVE_SSE)
+	if (cpu_flags & SPA_CPU_FLAG_SSE) {
+		run_test("test_f32", "sse", mix_f32_sse);
+	}
+#endif
+#if defined (HAVE_AVX)
+	if (cpu_flags & SPA_CPU_FLAG_AVX) {
+		run_test("test_f32", "avx", mix_f32_avx);
+	}
+#endif
+}
+
+static void test_f64(void)
+{
+	run_test("test_f64", "c", mix_f64_c);
+#if defined (HAVE_SSE2)
+	if (cpu_flags & SPA_CPU_FLAG_SSE2) {
+		run_test("test_f64", "sse2", mix_f64_sse2);
+	}
+#endif
+}
+
+static int compare_func(const void *_a, const void *_b)
+{
+	const struct stats *a = _a, *b = _b;
+	int diff;
+	if ((diff = strcmp(a->name, b->name)) != 0) return diff;
+	if ((diff = a->n_samples - b->n_samples) != 0) return diff;
+	if ((diff = a->n_src - b->n_src) != 0) return diff;
+	if ((diff = b->perf - a->perf) != 0) return diff;
+	return 0;
+}
+
+int main(int argc, char *argv[])
+{
+	uint32_t i;
+
+	cpu_flags = get_cpu_flags();
+	printf("got get CPU flags %d\n", cpu_flags);
+
+	test_s8();
+	test_u8();
+	test_s16();
+	test_u16();
+	test_s24();
+	test_u24();
+	test_s32();
+	test_u32();
+	test_s24_32();
+	test_u24_32();
+	test_f32();
+	test_f64();
+
+	qsort(results, n_results, sizeof(struct stats), compare_func);
+
+	for (i = 0; i < n_results; i++) {
+		struct stats *s = &results[i];
+		fprintf(stderr, "%-12."PRIu64" \t%-32.32s %s \t samples %d, src %d\n",
+				s->perf, s->name, s->impl, s->n_samples, s->n_src);
+	}
+	return 0;
+}
diff --git a/spa/plugins/audiomixer/meson.build b/spa/plugins/audiomixer/meson.build
new file mode 100644
index 0000000..5a4a1fb
--- /dev/null
+++ b/spa/plugins/audiomixer/meson.build
@@ -0,0 +1,126 @@
+audiomixer_sources = [
+  'audiomixer.c',
+  'mixer-dsp.c',
+  'plugin.c'
+]
+
+simd_cargs = []
+simd_dependencies = []
+
+audiomixer_c = static_library('audiomixer_c',
+  ['mix-ops-c.c' ],
+  c_args : ['-O3'],
+  dependencies : [ spa_dep ],
+  install : false
+)
+simd_dependencies += audiomixer_c
+
+if have_sse
+  audiomixer_sse = static_library('audiomixer_sse',
+    ['mix-ops-sse.c' ],
+    c_args : [sse_args, '-O3', '-DHAVE_SSE'],
+    dependencies : [ spa_dep ],
+    install : false
+  )
+  simd_cargs += ['-DHAVE_SSE']
+  simd_dependencies += audiomixer_sse
+endif
+if have_sse2
+  audiomixer_sse2 = static_library('audiomixer_sse2',
+    ['mix-ops-sse2.c' ],
+    c_args : [sse2_args, '-O3', '-DHAVE_SSE2'],
+    dependencies : [ spa_dep ],
+    install : false
+  )
+  simd_cargs += ['-DHAVE_SSE2']
+  simd_dependencies += audiomixer_sse2
+endif
+if have_avx and have_fma
+  audiomixer_avx = static_library('audiomixer_avx',
+    ['mix-ops-avx.c'],
+    c_args : [avx_args, fma_args, '-O3', '-DHAVE_AVX', '-DHAVE_FMA'],
+    dependencies : [ spa_dep ],
+    install : false
+  )
+  simd_cargs += ['-DHAVE_AVX', '-DHAVE_FMA']
+  simd_dependencies += audiomixer_avx
+endif
+
+audiomixer_lib = static_library('audiomixer',
+  ['mix-ops.c' ],
+  c_args : [ simd_cargs, '-O3'],
+  link_with : simd_dependencies,
+  include_directories : [configinc],
+  dependencies : [ spa_dep ],
+  install : false
+  )
+audiomixer_dep = declare_dependency(link_with: audiomixer_lib)
+
+spa_audiomixer_lib = shared_library('spa-audiomixer',
+  audiomixer_sources,
+  c_args : simd_cargs,
+  link_with : simd_dependencies,
+  dependencies : [ spa_dep, mathlib, audiomixer_dep ],
+  install : true,
+  install_dir : spa_plugindir / 'audiomixer'
+)
+spa_audiomixer_dep = declare_dependency(link_with: spa_audiomixer_lib)
+
+test_apps = [
+  'test-mix-ops',
+  ]
+
+foreach a : test_apps
+  test(a,
+    executable(a, a + '.c',
+      dependencies : [ spa_dep, dl_lib, pthread_lib, mathlib, audiomixer_dep ],
+      include_directories : [ configinc ],
+      link_with : [ test_lib ],
+      install_rpath : spa_plugindir / 'audiomixer',
+      c_args : [ simd_cargs ],
+      install : installed_tests_enabled,
+      install_dir : installed_tests_execdir / 'audiomixer'),
+      env : [
+        'SPA_PLUGIN_DIR=@0@'.format(spa_dep.get_variable('plugindir')),
+        ])
+
+    if installed_tests_enabled
+      test_conf = configuration_data()
+      test_conf.set('exec', installed_tests_execdir / 'audiomixer' / a)
+      configure_file(
+        input: installed_tests_template,
+        output: a + '.test',
+        install_dir: installed_tests_metadir / 'audiomixer',
+        configuration: test_conf
+        )
+  endif
+endforeach
+
+benchmark_apps = [
+  'benchmark-mix-ops',
+  ]
+
+foreach a : benchmark_apps
+  benchmark(a,
+    executable(a, a + '.c',
+      dependencies : [ spa_dep, dl_lib, pthread_lib, mathlib, audiomixer_dep ],
+      include_directories : [ configinc ],
+      c_args : [ simd_cargs ],
+      install_rpath : spa_plugindir / 'audiomixer',
+      install : installed_tests_enabled,
+      install_dir : installed_tests_execdir / 'audiomixer'),
+      env : [
+        'SPA_PLUGIN_DIR=@0@'.format(spa_dep.get_variable('plugindir')),
+        ])
+
+    if installed_tests_enabled
+      test_conf = configuration_data()
+      test_conf.set('exec', installed_tests_execdir / 'audiomixer' / a)
+      configure_file(
+        input: installed_tests_template,
+        output: a + '.test',
+        install_dir: installed_tests_metadir / 'audiomixer',
+        configuration: test_conf
+        )
+  endif
+endforeach
diff --git a/spa/plugins/audiomixer/mix-ops-avx.c b/spa/plugins/audiomixer/mix-ops-avx.c
new file mode 100644
index 0000000..3c5aa6b
--- /dev/null
+++ b/spa/plugins/audiomixer/mix-ops-avx.c
@@ -0,0 +1,88 @@
+/* Spa
+ *
+ * Copyright © 2019 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 <string.h>
+#include <stdio.h>
+#include <math.h>
+
+#include <spa/utils/defs.h>
+
+#include "mix-ops.h"
+
+#include <immintrin.h>
+
+void
+mix_f32_avx(struct mix_ops *ops, void * SPA_RESTRICT dst, const void * SPA_RESTRICT src[],
+		uint32_t n_src, uint32_t n_samples)
+{
+	n_samples *= ops->n_channels;
+
+	if (n_src == 0)
+		memset(dst, 0, n_samples * ops->n_channels * sizeof(float));
+	else if (n_src == 1) {
+		if (dst != src[0])
+			spa_memcpy(dst, src[0], n_samples * sizeof(float));
+	} else {
+		uint32_t i, n, unrolled;
+		const float **s = (const float **)src;
+		float *d = dst;
+
+		if (SPA_LIKELY(SPA_IS_ALIGNED(dst, 32))) {
+			unrolled = n_samples & ~31;
+			for (i = 0; i < n_src; i++) {
+				if (SPA_UNLIKELY(!SPA_IS_ALIGNED(src[i], 32))) {
+					unrolled = 0;
+					break;
+				}
+			}
+		} else
+			unrolled = 0;
+
+		for (n = 0; n < unrolled; n += 32) {
+			__m256 in[4];
+
+			in[0] = _mm256_load_ps(&s[0][n +  0]);
+			in[1] = _mm256_load_ps(&s[0][n +  8]);
+			in[2] = _mm256_load_ps(&s[0][n + 16]);
+			in[3] = _mm256_load_ps(&s[0][n + 24]);
+			for (i = 1; i < n_src; i++) {
+				in[0] = _mm256_add_ps(in[0], _mm256_load_ps(&s[i][n +  0]));
+				in[1] = _mm256_add_ps(in[1], _mm256_load_ps(&s[i][n +  8]));
+				in[2] = _mm256_add_ps(in[2], _mm256_load_ps(&s[i][n + 16]));
+				in[3] = _mm256_add_ps(in[3], _mm256_load_ps(&s[i][n + 24]));
+			}
+			_mm256_store_ps(&d[n +  0], in[0]);
+			_mm256_store_ps(&d[n +  8], in[1]);
+			_mm256_store_ps(&d[n + 16], in[2]);
+			_mm256_store_ps(&d[n + 24], in[3]);
+		}
+		for (; n < n_samples; n++) {
+			__m128 in[1];
+			in[0] = _mm_load_ss(&s[0][n]);
+			for (i = 1; i < n_src; i++)
+				in[0] = _mm_add_ss(in[0], _mm_load_ss(&s[i][n]));
+			_mm_store_ss(&d[n], in[0]);
+		}
+	}
+}
diff --git a/spa/plugins/audiomixer/mix-ops-c.c b/spa/plugins/audiomixer/mix-ops-c.c
new file mode 100644
index 0000000..2f79cd8
--- /dev/null
+++ b/spa/plugins/audiomixer/mix-ops-c.c
@@ -0,0 +1,68 @@
+/* Spa
+ *
+ * Copyright © 2019 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 <string.h>
+#include <stdio.h>
+#include <math.h>
+
+#include <spa/utils/defs.h>
+
+#include "mix-ops.h"
+
+#define MAKE_FUNC(name,type,atype,accum,clamp,zero)				\
+void mix_ ##name## _c(struct mix_ops *ops,					\
+		void * SPA_RESTRICT dst, const void * SPA_RESTRICT src[],	\
+                uint32_t n_src, uint32_t n_samples)				\
+{										\
+	uint32_t i, n;								\
+	type *d = dst;								\
+	const type **s = (const type **)src;					\
+	n_samples *= ops->n_channels;						\
+	if (n_src == 0 && zero)							\
+		memset(dst, 0, n_samples * sizeof(type));			\
+	else if (n_src == 1) {							\
+		if (dst != src[0])						\
+			spa_memcpy(dst, src[0], n_samples * sizeof(type));	\
+	} else {								\
+		for (n = 0; n < n_samples; n++) {				\
+			atype ac = 0;						\
+			for (i = 0; i < n_src; i++)				\
+				ac = accum (ac, s[i][n]);			\
+			d[n] = clamp (ac);					\
+		}								\
+	}									\
+}
+
+MAKE_FUNC(s8, int8_t, int16_t, S8_ACCUM, S8_CLAMP, true);
+MAKE_FUNC(u8, uint8_t, int16_t, U8_ACCUM, U8_CLAMP, false);
+MAKE_FUNC(s16, int16_t, int32_t, S16_ACCUM, S16_CLAMP, true);
+MAKE_FUNC(u16, uint16_t, int16_t, U16_ACCUM, U16_CLAMP, false);
+MAKE_FUNC(s24, int24_t, int32_t, S24_ACCUM, S24_CLAMP, false);
+MAKE_FUNC(u24, uint24_t, int32_t, U24_ACCUM, U24_CLAMP, false);
+MAKE_FUNC(s32, int32_t, int64_t, S32_ACCUM, S32_CLAMP, true);
+MAKE_FUNC(u32, uint32_t, int64_t, U32_ACCUM, U32_CLAMP, false);
+MAKE_FUNC(s24_32, int32_t, int32_t, S24_32_ACCUM, S24_32_CLAMP, true);
+MAKE_FUNC(u24_32, uint32_t, int32_t, U24_32_ACCUM, U24_32_CLAMP, false);
+MAKE_FUNC(f32, float, float, F32_ACCUM, F32_CLAMP, true);
+MAKE_FUNC(f64, double, double, F64_ACCUM, F64_CLAMP, true);
diff --git a/spa/plugins/audiomixer/mix-ops-sse.c b/spa/plugins/audiomixer/mix-ops-sse.c
new file mode 100644
index 0000000..bae619b
--- /dev/null
+++ b/spa/plugins/audiomixer/mix-ops-sse.c
@@ -0,0 +1,87 @@
+/* Spa
+ *
+ * Copyright © 2019 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 <string.h>
+#include <stdio.h>
+#include <math.h>
+
+#include <spa/utils/defs.h>
+
+#include "mix-ops.h"
+
+#include <xmmintrin.h>
+
+void
+mix_f32_sse(struct mix_ops *ops, void * SPA_RESTRICT dst, const void * SPA_RESTRICT src[],
+		uint32_t n_src, uint32_t n_samples)
+{
+	n_samples *= ops->n_channels;
+
+	if (n_src == 0) {
+		memset(dst, 0, n_samples * sizeof(float));
+	} else if (n_src == 1) {
+		if (dst != src[0])
+			spa_memcpy(dst, src[0], n_samples * sizeof(float));
+	} else {
+		uint32_t n, i, unrolled;
+		__m128 in[4];
+		const float **s = (const float **)src;
+		float *d = dst;
+
+		if (SPA_LIKELY(SPA_IS_ALIGNED(dst, 16))) {
+			unrolled = n_samples & ~15;
+			for (i = 0; i < n_src; i++) {
+				if (SPA_UNLIKELY(!SPA_IS_ALIGNED(src[i], 16))) {
+					unrolled = 0;
+					break;
+				}
+			}
+		} else
+			unrolled = 0;
+
+		for (n = 0; n < unrolled; n += 16) {
+			in[0] = _mm_load_ps(&s[0][n+ 0]);
+			in[1] = _mm_load_ps(&s[0][n+ 4]);
+			in[2] = _mm_load_ps(&s[0][n+ 8]);
+			in[3] = _mm_load_ps(&s[0][n+12]);
+
+			for (i = 1; i < n_src; i++) {
+				in[0] = _mm_add_ps(in[0], _mm_load_ps(&s[i][n+ 0]));
+				in[1] = _mm_add_ps(in[1], _mm_load_ps(&s[i][n+ 4]));
+				in[2] = _mm_add_ps(in[2], _mm_load_ps(&s[i][n+ 8]));
+				in[3] = _mm_add_ps(in[3], _mm_load_ps(&s[i][n+12]));
+			}
+			_mm_store_ps(&d[n+ 0], in[0]);
+			_mm_store_ps(&d[n+ 4], in[1]);
+			_mm_store_ps(&d[n+ 8], in[2]);
+			_mm_store_ps(&d[n+12], in[3]);
+		}
+		for (; n < n_samples; n++) {
+			in[0] = _mm_load_ss(&s[0][n]);
+			for (i = 1; i < n_src; i++)
+				in[0] = _mm_add_ss(in[0], _mm_load_ss(&s[i][n]));
+			_mm_store_ss(&d[n], in[0]);
+		}
+	}
+}
diff --git a/spa/plugins/audiomixer/mix-ops-sse2.c b/spa/plugins/audiomixer/mix-ops-sse2.c
new file mode 100644
index 0000000..e2f632d
--- /dev/null
+++ b/spa/plugins/audiomixer/mix-ops-sse2.c
@@ -0,0 +1,87 @@
+/* Spa
+ *
+ * Copyright © 2019 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 <string.h>
+#include <stdio.h>
+#include <math.h>
+
+#include <spa/utils/defs.h>
+
+#include "mix-ops.h"
+
+#include <emmintrin.h>
+
+void
+mix_f64_sse2(struct mix_ops *ops, void * SPA_RESTRICT dst, const void * SPA_RESTRICT src[],
+		uint32_t n_src, uint32_t n_samples)
+{
+	n_samples *= ops->n_channels;
+
+	if (n_src == 0) {
+		memset(dst, 0, n_samples * sizeof(double));
+	} else if (n_src == 1) {
+		if (dst != src[0])
+			spa_memcpy(dst, src[0], n_samples * sizeof(double));
+	} else {
+		uint32_t n, i, unrolled;
+		__m128d in[4];
+		const double **s = (const double **)src;
+		double *d = dst;
+
+		if (SPA_LIKELY(SPA_IS_ALIGNED(dst, 16))) {
+			unrolled = n_samples & ~15;
+			for (i = 0; i < n_src; i++) {
+				if (SPA_UNLIKELY(!SPA_IS_ALIGNED(src[i], 16))) {
+					unrolled = 0;
+					break;
+				}
+			}
+		} else
+			unrolled = 0;
+
+		for (n = 0; n < unrolled; n += 8) {
+			in[0] = _mm_load_pd(&s[0][n+0]);
+			in[1] = _mm_load_pd(&s[0][n+2]);
+			in[2] = _mm_load_pd(&s[0][n+4]);
+			in[3] = _mm_load_pd(&s[0][n+6]);
+
+			for (i = 1; i < n_src; i++) {
+				in[0] = _mm_add_pd(in[0], _mm_load_pd(&s[i][n+0]));
+				in[1] = _mm_add_pd(in[1], _mm_load_pd(&s[i][n+2]));
+				in[2] = _mm_add_pd(in[2], _mm_load_pd(&s[i][n+4]));
+				in[3] = _mm_add_pd(in[3], _mm_load_pd(&s[i][n+6]));
+			}
+			_mm_store_pd(&d[n+0], in[0]);
+			_mm_store_pd(&d[n+2], in[1]);
+			_mm_store_pd(&d[n+4], in[2]);
+			_mm_store_pd(&d[n+6], in[3]);
+		}
+		for (; n < n_samples; n++) {
+			in[0] = _mm_load_sd(&s[0][n]);
+			for (i = 1; i < n_src; i++)
+				in[0] = _mm_add_sd(in[0], _mm_load_sd(&s[i][n]));
+			_mm_store_sd(&d[n], in[0]);
+		}
+	}
+}
diff --git a/spa/plugins/audiomixer/mix-ops.c b/spa/plugins/audiomixer/mix-ops.c
new file mode 100644
index 0000000..b459926
--- /dev/null
+++ b/spa/plugins/audiomixer/mix-ops.c
@@ -0,0 +1,136 @@
+/* Spa
+ *
+ * Copyright © 2019 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 <string.h>
+#include <stdio.h>
+#include <math.h>
+
+#include <spa/support/cpu.h>
+#include <spa/utils/defs.h>
+#include <spa/param/audio/format-utils.h>
+
+#include "mix-ops.h"
+
+typedef void (*mix_func_t) (struct mix_ops *ops, void * SPA_RESTRICT dst,
+		const void * SPA_RESTRICT src[], uint32_t n_src, uint32_t n_samples);
+
+struct mix_info {
+	uint32_t fmt;
+	uint32_t n_channels;
+	uint32_t cpu_flags;
+	uint32_t stride;
+	mix_func_t process;
+};
+
+static struct mix_info mix_table[] =
+{
+	/* f32 */
+#if defined(HAVE_AVX)
+	{ SPA_AUDIO_FORMAT_F32, 0, SPA_CPU_FLAG_AVX, 4, mix_f32_avx },
+	{ SPA_AUDIO_FORMAT_F32P, 0, SPA_CPU_FLAG_AVX, 4, mix_f32_avx },
+#endif
+#if defined (HAVE_SSE)
+	{ SPA_AUDIO_FORMAT_F32, 0, SPA_CPU_FLAG_SSE, 4, mix_f32_sse },
+	{ SPA_AUDIO_FORMAT_F32P, 0, SPA_CPU_FLAG_SSE, 4, mix_f32_sse },
+#endif
+	{ SPA_AUDIO_FORMAT_F32, 0, 0, 4, mix_f32_c },
+	{ SPA_AUDIO_FORMAT_F32P, 0, 0, 4, mix_f32_c },
+
+	/* f64 */
+#if defined (HAVE_SSE2)
+	{ SPA_AUDIO_FORMAT_F64, 0, SPA_CPU_FLAG_SSE2, 8, mix_f64_sse2 },
+	{ SPA_AUDIO_FORMAT_F64P, 0, SPA_CPU_FLAG_SSE2, 8, mix_f64_sse2 },
+#endif
+	{ SPA_AUDIO_FORMAT_F64, 0, 0, 8, mix_f64_c },
+	{ SPA_AUDIO_FORMAT_F64P, 0, 0, 8, mix_f64_c },
+
+	/* s8 */
+	{ SPA_AUDIO_FORMAT_S8, 0, 0, 1, mix_s8_c },
+	{ SPA_AUDIO_FORMAT_S8P, 0, 0, 1, mix_s8_c },
+	{ SPA_AUDIO_FORMAT_U8, 0, 0, 1, mix_u8_c },
+	{ SPA_AUDIO_FORMAT_U8P, 0, 0, 1, mix_u8_c },
+
+	/* s16 */
+	{ SPA_AUDIO_FORMAT_S16, 0, 0, 2, mix_s16_c },
+	{ SPA_AUDIO_FORMAT_S16P, 0, 0, 2, mix_s16_c },
+	{ SPA_AUDIO_FORMAT_U16, 0, 0, 2, mix_u16_c },
+
+	/* s24 */
+	{ SPA_AUDIO_FORMAT_S24, 0, 0, 3, mix_s24_c },
+	{ SPA_AUDIO_FORMAT_S24P, 0, 0, 3, mix_s24_c },
+	{ SPA_AUDIO_FORMAT_U24, 0, 0, 3, mix_u24_c },
+
+	/* s32 */
+	{ SPA_AUDIO_FORMAT_S32, 0, 0, 4, mix_s32_c },
+	{ SPA_AUDIO_FORMAT_S32P, 0, 0, 4, mix_s32_c },
+	{ SPA_AUDIO_FORMAT_U32, 0, 0, 4, mix_u32_c },
+
+	/* s24_32 */
+	{ SPA_AUDIO_FORMAT_S24_32, 0, 0, 4, mix_s24_32_c },
+	{ SPA_AUDIO_FORMAT_S24_32P, 0, 0, 4, mix_s24_32_c },
+	{ SPA_AUDIO_FORMAT_U24_32, 0, 0, 4, mix_u24_32_c },
+};
+
+#define MATCH_CHAN(a,b)		((a) == 0 || (a) == (b))
+#define MATCH_CPU_FLAGS(a,b)	((a) == 0 || ((a) & (b)) == a)
+
+static const struct mix_info *find_mix_info(uint32_t fmt,
+		uint32_t n_channels, uint32_t cpu_flags)
+{
+	SPA_FOR_EACH_ELEMENT_VAR(mix_table, t) {
+		if (t->fmt == fmt &&
+		    MATCH_CHAN(t->n_channels, n_channels) &&
+		    MATCH_CPU_FLAGS(t->cpu_flags, cpu_flags))
+			return t;
+	}
+	return NULL;
+}
+
+static void impl_mix_ops_clear(struct mix_ops *ops, void * SPA_RESTRICT dst, uint32_t n_samples)
+{
+	const struct mix_info *info = ops->priv;
+	memset(dst, 0, n_samples * info->stride);
+}
+
+static void impl_mix_ops_free(struct mix_ops *ops)
+{
+	spa_zero(*ops);
+}
+
+int mix_ops_init(struct mix_ops *ops)
+{
+	const struct mix_info *info;
+
+	info = find_mix_info(ops->fmt, ops->n_channels, ops->cpu_flags);
+	if (info == NULL)
+		return -ENOTSUP;
+
+	ops->priv = info;
+	ops->cpu_flags = info->cpu_flags;
+	ops->clear = impl_mix_ops_clear;
+	ops->process = info->process;
+	ops->free = impl_mix_ops_free;
+
+	return 0;
+}
diff --git a/spa/plugins/audiomixer/mix-ops.h b/spa/plugins/audiomixer/mix-ops.h
new file mode 100644
index 0000000..11e88dc
--- /dev/null
+++ b/spa/plugins/audiomixer/mix-ops.h
@@ -0,0 +1,169 @@
+/* Spa
+ *
+ * Copyright © 2019 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 <spa/utils/defs.h>
+
+typedef struct {
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+	uint8_t v3;
+	uint8_t v2;
+	uint8_t v1;
+#else
+	uint8_t v1;
+	uint8_t v2;
+	uint8_t v3;
+#endif
+} __attribute__ ((packed)) uint24_t;
+
+typedef struct {
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+	uint8_t v3;
+	uint8_t v2;
+	int8_t v1;
+#else
+	int8_t v1;
+	uint8_t v2;
+	uint8_t v3;
+#endif
+} __attribute__ ((packed)) int24_t;
+
+static inline uint32_t u24_to_u32(uint24_t src)
+{
+	return ((uint32_t)src.v1 << 16) | ((uint32_t)src.v2 << 8) | (uint32_t)src.v3;
+}
+
+#define U32_TO_U24(s) (uint24_t) { .v1 = (uint8_t)(((uint32_t)s) >> 16), \
+	.v2 = (uint8_t)(((uint32_t)s) >> 8), .v3 = (uint8_t)((uint32_t)s) }
+
+static inline uint24_t u32_to_u24(uint32_t src)
+{
+	return U32_TO_U24(src);
+}
+
+static inline int32_t s24_to_s32(int24_t src)
+{
+	return ((int32_t)src.v1 << 16) | ((uint32_t)src.v2 << 8) | (uint32_t)src.v3;
+}
+
+#define S32_TO_S24(s) (int24_t) { .v1 = (int8_t)(((int32_t)s) >> 16), \
+	.v2 = (uint8_t)(((uint32_t)s) >> 8), .v3 = (uint8_t)((uint32_t)s) }
+
+static inline int24_t s32_to_s24(int32_t src)
+{
+	return S32_TO_S24(src);
+}
+
+
+#define S8_MIN			-128
+#define S8_MAX			127
+#define S8_ACCUM(a,b)		((a) + (int16_t)(b))
+#define S8_CLAMP(a)		(int8_t)(SPA_CLAMP((a), S8_MIN, S8_MAX))
+#define U8_OFFS			128
+#define U8_ACCUM(a,b)		((a) + ((int16_t)(b) - U8_OFFS))
+#define U8_CLAMP(a)		(uint8_t)(SPA_CLAMP((a), S8_MIN, S8_MAX) + U8_OFFS)
+
+#define S16_MIN			-32768
+#define S16_MAX			32767
+#define S16_ACCUM(a,b)		((a) + (int32_t)(b))
+#define S16_CLAMP(a)		(int16_t)(SPA_CLAMP((a), S16_MIN, S16_MAX))
+#define U16_OFFS		32768
+#define U16_ACCUM(a,b)		((a) + ((int32_t)(b) - U16_OFFS))
+#define U16_CLAMP(a)		(uint16_t)(SPA_CLAMP((a), S16_MIN, S16_MAX) + U16_OFFS)
+
+#define S24_32_MIN		-8388608
+#define S24_32_MAX		8388607
+#define S24_32_ACCUM(a,b)	((a) + (int32_t)(b))
+#define S24_32_CLAMP(a)		(int32_t)(SPA_CLAMP((a), S24_32_MIN, S24_32_MAX))
+#define U24_32_OFFS		8388608
+#define U24_32_ACCUM(a,b)	((a) + ((int32_t)(b) - U24_32_OFFS))
+#define U24_32_CLAMP(a)		(uint32_t)(SPA_CLAMP((a), S24_32_MIN, S24_32_MAX) + U24_32_OFFS)
+
+#define S24_ACCUM(a,b)		S24_32_ACCUM(a, s24_to_s32(b))
+#define S24_CLAMP(a)		s32_to_s24(S24_32_CLAMP(a))
+#define U24_ACCUM(a,b)		U24_32_ACCUM(a, u24_to_u32(b))
+#define U24_CLAMP(a)		u32_to_u24(U24_32_CLAMP(a))
+
+#define S32_MIN			-2147483648
+#define S32_MAX			2147483647
+#define S32_ACCUM(a,b)		((a) + (int64_t)(b))
+#define S32_CLAMP(a)		(int32_t)(SPA_CLAMP((a), S32_MIN, S32_MAX))
+#define U32_OFFS		2147483648
+#define U32_ACCUM(a,b)		((a) + ((int64_t)(b) - U32_OFFS))
+#define U32_CLAMP(a)		(uint32_t)(SPA_CLAMP((a), S32_MIN, S32_MAX) + U32_OFFS)
+
+#define F32_ACCUM(a,b)		((a) + (b))
+#define F32_CLAMP(a)		(a)
+#define F64_ACCUM(a,b)		((a) + (b))
+#define F64_CLAMP(a)		(a)
+
+struct mix_ops {
+	uint32_t fmt;
+	uint32_t n_channels;
+	uint32_t cpu_flags;
+
+	void (*clear) (struct mix_ops *ops, void * SPA_RESTRICT dst, uint32_t n_samples);
+	void (*process) (struct mix_ops *ops,
+			void * SPA_RESTRICT dst,
+			const void * SPA_RESTRICT src[], uint32_t n_src,
+			uint32_t n_samples);
+	void (*free) (struct mix_ops *ops);
+
+	const void *priv;
+};
+
+int mix_ops_init(struct mix_ops *ops);
+
+#define mix_ops_clear(ops,...)		(ops)->clear(ops, __VA_ARGS__)
+#define mix_ops_process(ops,...)	(ops)->process(ops, __VA_ARGS__)
+#define mix_ops_free(ops)		(ops)->free(ops)
+
+#define DEFINE_FUNCTION(name,arch) \
+void mix_##name##_##arch(struct mix_ops *ops, void * SPA_RESTRICT dst,	\
+		const void * SPA_RESTRICT src[], uint32_t n_src,		\
+		uint32_t n_samples)						\
+
+#define MIX_OPS_MAX_ALIGN	32
+
+DEFINE_FUNCTION(s8, c);
+DEFINE_FUNCTION(u8, c);
+DEFINE_FUNCTION(s16, c);
+DEFINE_FUNCTION(u16, c);
+DEFINE_FUNCTION(s24, c);
+DEFINE_FUNCTION(u24, c);
+DEFINE_FUNCTION(s32, c);
+DEFINE_FUNCTION(u32, c);
+DEFINE_FUNCTION(s24_32, c);
+DEFINE_FUNCTION(u24_32, c);
+DEFINE_FUNCTION(f32, c);
+DEFINE_FUNCTION(f64, c);
+
+#if defined(HAVE_SSE)
+DEFINE_FUNCTION(f32, sse);
+#endif
+#if defined(HAVE_SSE2)
+DEFINE_FUNCTION(f64, sse2);
+#endif
+#if defined(HAVE_AVX)
+DEFINE_FUNCTION(f32, avx);
+#endif
diff --git a/spa/plugins/audiomixer/mixer-dsp.c b/spa/plugins/audiomixer/mixer-dsp.c
new file mode 100644
index 0000000..534cfab
--- /dev/null
+++ b/spa/plugins/audiomixer/mixer-dsp.c
@@ -0,0 +1,927 @@
+/* Spa
+ *
+ * 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 <errno.h>
+#include <string.h>
+#include <stdio.h>
+
+#include <spa/support/plugin.h>
+#include <spa/support/log.h>
+#include <spa/support/cpu.h>
+#include <spa/utils/list.h>
+#include <spa/utils/names.h>
+#include <spa/utils/string.h>
+#include <spa/node/node.h>
+#include <spa/node/utils.h>
+#include <spa/node/io.h>
+#include <spa/param/audio/format-utils.h>
+#include <spa/param/param.h>
+#include <spa/pod/filter.h>
+
+#include "mix-ops.h"
+
+#undef SPA_LOG_TOPIC_DEFAULT
+#define SPA_LOG_TOPIC_DEFAULT log_topic
+static struct spa_log_topic *log_topic = &SPA_LOG_TOPIC(0, "spa.mixer-dsp");
+
+#define MAX_BUFFERS	64
+#define MAX_PORTS	128
+#define MAX_ALIGN	MIX_OPS_MAX_ALIGN
+
+#define PORT_DEFAULT_VOLUME	1.0
+#define PORT_DEFAULT_MUTE	false
+
+struct port_props {
+	double volume;
+	int32_t mute;
+};
+
+static void port_props_reset(struct port_props *props)
+{
+	props->volume = PORT_DEFAULT_VOLUME;
+	props->mute = PORT_DEFAULT_MUTE;
+}
+
+struct buffer {
+	uint32_t id;
+#define BUFFER_FLAG_QUEUED	(1 << 0)
+	uint32_t flags;
+
+	struct spa_list link;
+	struct spa_buffer *buffer;
+	struct spa_meta_header *h;
+	struct spa_buffer buf;
+};
+
+struct port {
+	uint32_t direction;
+	uint32_t id;
+
+	struct port_props props;
+
+	struct spa_io_buffers *io;
+
+	uint64_t info_all;
+	struct spa_port_info info;
+	struct spa_param_info params[8];
+
+	unsigned int valid:1;
+	unsigned int have_format:1;
+
+	struct buffer buffers[MAX_BUFFERS];
+	uint32_t n_buffers;
+
+	struct spa_list queue;
+	size_t queued_bytes;
+};
+
+struct impl {
+	struct spa_handle handle;
+	struct spa_node node;
+
+	struct spa_log *log;
+	struct spa_cpu *cpu;
+	uint32_t cpu_flags;
+	uint32_t max_align;
+
+	uint32_t quantum_limit;
+
+	struct mix_ops ops;
+
+	uint64_t info_all;
+	struct spa_node_info info;
+	struct spa_param_info params[8];
+
+	struct spa_hook_list hooks;
+
+	uint32_t port_count;
+	uint32_t last_port;
+	struct port *in_ports[MAX_PORTS];
+	struct port out_ports[1];
+
+	int n_formats;
+	struct spa_audio_info format;
+	uint32_t stride;
+
+	unsigned int have_format:1;
+	unsigned int started:1;
+};
+
+#define PORT_VALID(p)                ((p) != NULL && (p)->valid)
+#define CHECK_FREE_IN_PORT(this,d,p) ((d) == SPA_DIRECTION_INPUT && (p) < MAX_PORTS && !PORT_VALID(this->in_ports[(p)]))
+#define CHECK_IN_PORT(this,d,p)      ((d) == SPA_DIRECTION_INPUT && (p) < MAX_PORTS && PORT_VALID(this->in_ports[(p)]))
+#define CHECK_OUT_PORT(this,d,p)     ((d) == SPA_DIRECTION_OUTPUT && (p) == 0)
+#define CHECK_PORT(this,d,p)         (CHECK_OUT_PORT(this,d,p) || CHECK_IN_PORT (this,d,p))
+#define GET_IN_PORT(this,p)          (this->in_ports[p])
+#define GET_OUT_PORT(this,p)         (&this->out_ports[p])
+#define GET_PORT(this,d,p)           (d == SPA_DIRECTION_INPUT ? GET_IN_PORT(this,p) : GET_OUT_PORT(this,p))
+
+static int impl_node_enum_params(void *object, int seq,
+				 uint32_t id, uint32_t start, uint32_t num,
+				 const struct spa_pod *filter)
+{
+	return -ENOTSUP;
+}
+
+static int impl_node_set_param(void *object, uint32_t id, uint32_t flags,
+			       const struct spa_pod *param)
+{
+	return -ENOTSUP;
+}
+
+static int impl_node_set_io(void *object, uint32_t id, void *data, size_t size)
+{
+	return -ENOTSUP;
+}
+
+static int impl_node_send_command(void *object, const struct spa_command *command)
+{
+	struct impl *this = object;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(command != NULL, -EINVAL);
+
+	switch (SPA_NODE_COMMAND_ID(command)) {
+	case SPA_NODE_COMMAND_Start:
+		this->started = true;
+		break;
+	case SPA_NODE_COMMAND_Pause:
+		this->started = false;
+		break;
+	default:
+		return -ENOTSUP;
+	}
+	return 0;
+}
+
+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) {
+		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,
+				port->direction, port->id, &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;
+	uint32_t i;
+
+	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, GET_OUT_PORT(this, 0), true);
+	for (i = 0; i < this->last_port; i++) {
+		if (PORT_VALID(this->in_ports[i]))
+			emit_port_info(this, GET_IN_PORT(this, i), 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 *user_data)
+{
+	return 0;
+}
+
+static int impl_node_add_port(void *object, enum spa_direction direction, uint32_t port_id,
+		const struct spa_dict *props)
+{
+	struct impl *this = object;
+	struct port *port;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(CHECK_FREE_IN_PORT(this, direction, port_id), -EINVAL);
+
+	port = GET_IN_PORT (this, port_id);
+	if (port == NULL) {
+		port = calloc(1, sizeof(struct port));
+		if (port == NULL)
+			return -errno;
+		this->in_ports[port_id] = port;
+	}
+
+	port->direction = direction;
+	port->id = port_id;
+
+	port_props_reset(&port->props);
+
+	spa_list_init(&port->queue);
+	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_DYNAMIC_DATA |
+			   SPA_PORT_FLAG_REMOVABLE |
+			   SPA_PORT_FLAG_OPTIONAL;
+	port->params[0] = SPA_PARAM_INFO(SPA_PARAM_EnumFormat, SPA_PARAM_INFO_READ);
+	port->params[1] = SPA_PARAM_INFO(SPA_PARAM_Meta, SPA_PARAM_INFO_READ);
+	port->params[2] = SPA_PARAM_INFO(SPA_PARAM_IO, SPA_PARAM_INFO_READ);
+	port->params[3] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
+	port->params[4] = SPA_PARAM_INFO(SPA_PARAM_Buffers, 0);
+	port->info.params = port->params;
+	port->info.n_params = 5;
+
+	this->port_count++;
+	if (this->last_port <= port_id)
+		this->last_port = port_id + 1;
+	port->valid = true;
+
+	spa_log_debug(this->log, "%p: add port %d:%d %d", this,
+			direction, port_id, this->last_port);
+	emit_port_info(this, port, true);
+
+	return 0;
+}
+
+static int
+impl_node_remove_port(void *object, enum spa_direction direction, uint32_t port_id)
+{
+	struct impl *this = object;
+	struct port *port;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(CHECK_IN_PORT(this, direction, port_id), -EINVAL);
+
+	port = GET_IN_PORT (this, port_id);
+
+	port->valid = false;
+	this->port_count--;
+	if (port->have_format && this->have_format) {
+		if (--this->n_formats == 0)
+			this->have_format = false;
+	}
+	spa_memzero(port, sizeof(struct port));
+
+	if (port_id + 1 == this->last_port) {
+		int i;
+
+		for (i = this->last_port - 1; i >= 0; i--)
+			if (PORT_VALID(GET_IN_PORT(this, i)))
+				break;
+
+		this->last_port = i + 1;
+	}
+	spa_log_debug(this->log, "%p: remove port %d:%d %d", this,
+			direction, port_id, this->last_port);
+
+	spa_node_emit_port_info(&this->hooks, direction, port_id, NULL);
+
+	return 0;
+}
+
+static int port_enum_formats(void *object,
+			     enum spa_direction direction, uint32_t port_id,
+			     uint32_t index,
+			     struct spa_pod **param,
+			     struct spa_pod_builder *builder)
+{
+	struct impl *this = object;
+
+	switch (index) {
+	case 0:
+		if (this->have_format) {
+			*param = spa_format_audio_dsp_build(builder, SPA_PARAM_EnumFormat,
+					&this->format.info.dsp);
+		} else {
+			*param = spa_pod_builder_add_object(builder,
+				SPA_TYPE_OBJECT_Format, SPA_PARAM_EnumFormat,
+				SPA_FORMAT_mediaType,      SPA_POD_Id(SPA_MEDIA_TYPE_audio),
+				SPA_FORMAT_mediaSubtype,   SPA_POD_Id(SPA_MEDIA_SUBTYPE_dsp),
+				SPA_FORMAT_AUDIO_format,   SPA_POD_Id(SPA_AUDIO_FORMAT_DSP_F32));
+		}
+		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 *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 = GET_PORT(this, direction, port_id);
+
+	result.id = id;
+	result.next = start;
+next:
+	result.index = result.next++;
+
+	spa_pod_builder_init(&b, buffer, sizeof(buffer));
+
+	switch (id) {
+	case SPA_PARAM_EnumFormat:
+		if ((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_dsp_build(&b, id, &this->format.info.dsp);
+		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(1),
+			SPA_PARAM_BUFFERS_size,    SPA_POD_CHOICE_RANGE_Int(
+								this->quantum_limit * this->stride,
+								16 * this->stride,
+								INT32_MAX),
+			SPA_PARAM_BUFFERS_stride,  SPA_POD_Int(this->stride));
+		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;
+	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_debug(this->log, "%p: clear buffers %p", this, port);
+		port->n_buffers = 0;
+		spa_list_init(&port->queue);
+	}
+	return 0;
+}
+
+static int queue_buffer(struct impl *this, struct port *port, struct buffer *b)
+{
+	if (SPA_FLAG_IS_SET(b->flags, BUFFER_FLAG_QUEUED))
+		return -EINVAL;
+
+	spa_list_append(&port->queue, &b->link);
+	SPA_FLAG_SET(b->flags, BUFFER_FLAG_QUEUED);
+	spa_log_trace_fp(this->log, "%p: queue buffer %d", this, b->id);
+	return 0;
+}
+
+static struct buffer *dequeue_buffer(struct impl *this, struct port *port)
+{
+	struct buffer *b;
+
+	if (spa_list_is_empty(&port->queue))
+		return NULL;
+
+	b = spa_list_first(&port->queue, struct buffer, link);
+	spa_list_remove(&b->link);
+	SPA_FLAG_CLEAR(b->flags, BUFFER_FLAG_QUEUED);
+	spa_log_trace_fp(this->log, "%p: dequeue buffer %d", this, b->id);
+	return b;
+}
+
+static int port_set_format(void *object,
+			   enum spa_direction direction,
+			   uint32_t port_id,
+			   uint32_t flags,
+			   const struct spa_pod *format)
+{
+	struct impl *this = object;
+	struct port *port;
+	int res;
+
+	port = GET_PORT(this, direction, port_id);
+
+	if (format == NULL) {
+		if (port->have_format) {
+			port->have_format = false;
+			if (--this->n_formats == 0)
+				this->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_dsp)
+			return -EINVAL;
+
+		if (spa_format_audio_dsp_parse(format, &info.info.dsp) < 0)
+			return -EINVAL;
+
+		if (info.info.dsp.format != SPA_AUDIO_FORMAT_DSP_F32)
+			return -EINVAL;
+
+		if (!this->have_format) {
+			this->ops.fmt = info.info.dsp.format;
+			this->ops.n_channels = 1;
+			this->ops.cpu_flags = this->cpu_flags;
+
+			if ((res = mix_ops_init(&this->ops)) < 0)
+				return res;
+
+			this->stride = sizeof(float);
+			this->have_format = true;
+			this->format = info;
+		}
+		if (!port->have_format) {
+			this->n_formats++;
+			port->have_format = true;
+			spa_log_debug(this->log, "%p: set format on port %d:%d",
+					this, direction, port_id);
+		}
+	}
+	port->info.change_mask |= SPA_PORT_CHANGE_MASK_PARAMS;
+	if (port->have_format) {
+		port->params[3] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_READWRITE);
+		port->params[4] = SPA_PARAM_INFO(SPA_PARAM_Buffers, SPA_PARAM_INFO_READ);
+	} else {
+		port->params[3] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
+		port->params[4] = 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);
+
+	if (id == SPA_PARAM_Format) {
+		return port_set_format(this, direction, port_id, flags, param);
+	}
+	else
+		return -ENOENT;
+}
+
+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_log_debug(this->log, "%p: use %d buffers on port %d:%d",
+			this, n_buffers, direction, port_id);
+
+	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+
+	port = GET_PORT(this, direction, port_id);
+
+	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->buffer = buffers[i];
+		b->flags = 0;
+		b->id = i;
+		b->h = spa_buffer_find_meta_data(buffers[i], SPA_META_Header, sizeof(*b->h));
+		b->buf = *buffers[i];
+
+		if (d[0].data == NULL) {
+			spa_log_error(this->log, "%p: invalid memory on buffer %d", this, i);
+			return -EINVAL;
+		}
+		if (!SPA_IS_ALIGNED(d[0].data, this->max_align)) {
+			spa_log_warn(this->log, "%p: memory on buffer %d not aligned", this, i);
+		}
+		if (direction == SPA_DIRECTION_OUTPUT)
+			queue_buffer(this, port, b);
+
+		spa_log_debug(this->log, "%p: port %d:%d buffer:%d n_data:%d data:%p maxsize:%d",
+				this, direction, port_id, i,
+				buffers[i]->n_datas, d[0].data, d[0].maxsize);
+	}
+	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_log_debug(this->log, "%p: port %d:%d io %d %p/%zd", this,
+			direction, port_id, id, data, size);
+
+	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+
+	port = GET_PORT(this, direction, port_id);
+
+	switch (id) {
+	case SPA_IO_Buffers:
+		port->io = data;
+		break;
+	default:
+		return -ENOENT;
+	}
+	return 0;
+}
+
+static int impl_node_port_reuse_buffer(void *object, uint32_t port_id, uint32_t buffer_id)
+{
+	struct impl *this = object;
+	struct port *port;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(CHECK_PORT(this, SPA_DIRECTION_OUTPUT, port_id), -EINVAL);
+	port = GET_OUT_PORT(this, 0);
+
+	if (buffer_id >= port->n_buffers)
+		return -EINVAL;
+
+	return queue_buffer(this, port, &port->buffers[buffer_id]);
+}
+
+static int impl_node_process(void *object)
+{
+	struct impl *this = object;
+	struct port *outport;
+	struct spa_io_buffers *outio;
+	uint32_t n_buffers, i, maxsize;
+	struct buffer **buffers;
+	struct buffer *outb;
+	const void **datas;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	outport = GET_OUT_PORT(this, 0);
+	if ((outio = outport->io) == NULL)
+		return -EIO;
+
+	spa_log_trace_fp(this->log, "%p: status %p %d %d",
+			this, outio, outio->status, outio->buffer_id);
+
+	if (SPA_UNLIKELY(outio->status == SPA_STATUS_HAVE_DATA))
+		return outio->status;
+
+	/* recycle */
+	if (SPA_LIKELY(outio->buffer_id < outport->n_buffers)) {
+		queue_buffer(this, outport, &outport->buffers[outio->buffer_id]);
+		outio->buffer_id = SPA_ID_INVALID;
+	}
+
+	buffers = alloca(MAX_PORTS * sizeof(struct buffer *));
+	datas = alloca(MAX_PORTS * sizeof(void *));
+	n_buffers = 0;
+
+	maxsize = UINT32_MAX;
+
+	for (i = 0; i < this->last_port; i++) {
+		struct port *inport = GET_IN_PORT(this, i);
+		struct spa_io_buffers *inio = NULL;
+		struct buffer *inb;
+		struct spa_data *bd;
+		uint32_t size, offs;
+
+		if (SPA_UNLIKELY(!PORT_VALID(inport) ||
+		    (inio = inport->io) == NULL ||
+		    inio->buffer_id >= inport->n_buffers ||
+		    inio->status != SPA_STATUS_HAVE_DATA)) {
+			spa_log_trace_fp(this->log, "%p: skip input idx:%d valid:%d "
+					"io:%p status:%d buf_id:%d n_buffers:%d", this,
+				i, PORT_VALID(inport), inio,
+				inio ? inio->status : -1,
+				inio ? inio->buffer_id : SPA_ID_INVALID,
+				inport->n_buffers);
+			continue;
+		}
+
+		inb = &inport->buffers[inio->buffer_id];
+		bd = &inb->buffer->datas[0];
+
+		offs = SPA_MIN(bd->chunk->offset, bd->maxsize);
+		size = SPA_MIN(bd->maxsize - offs, bd->chunk->size);
+		maxsize = SPA_MIN(maxsize, size);
+
+		spa_log_trace_fp(this->log, "%p: mix input %d %p->%p %d %d %d:%d", this,
+				i, inio, outio, inio->status, inio->buffer_id,
+				offs, size);
+
+		if (!SPA_FLAG_IS_SET(bd->chunk->flags, SPA_CHUNK_FLAG_EMPTY)) {
+			datas[n_buffers] = SPA_PTROFF(bd->data, offs, void);
+			buffers[n_buffers++] = inb;
+		}
+		inio->status = SPA_STATUS_NEED_DATA;
+	}
+
+	outb = dequeue_buffer(this, outport);
+	if (SPA_UNLIKELY(outb == NULL)) {
+		spa_log_trace(this->log, "%p: out of buffers", this);
+		return -EPIPE;
+	}
+
+	if (n_buffers == 1) {
+		*outb->buffer = *buffers[0]->buffer;
+	} else {
+		struct spa_data *d = outb->buf.datas;
+
+		*outb->buffer = outb->buf;
+
+		maxsize = SPA_MIN(maxsize, d[0].maxsize);
+
+		d[0].chunk->offset = 0;
+		d[0].chunk->size = maxsize;
+		d[0].chunk->stride = sizeof(float);
+		SPA_FLAG_UPDATE(d[0].chunk->flags, SPA_CHUNK_FLAG_EMPTY, n_buffers == 0);
+
+		spa_log_trace_fp(this->log, "%p: %d mix %d", this, n_buffers, maxsize);
+
+		mix_ops_process(&this->ops, d[0].data,
+				datas, n_buffers, maxsize / sizeof(float));
+	}
+
+	outio->buffer_id = outb->id;
+	outio->status = SPA_STATUS_HAVE_DATA;
+
+	return SPA_STATUS_HAVE_DATA | SPA_STATUS_NEED_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_param = impl_node_set_param,
+	.set_io = impl_node_set_io,
+	.send_command = impl_node_send_command,
+	.add_port = impl_node_add_port,
+	.remove_port = impl_node_remove_port,
+	.port_enum_params = impl_node_port_enum_params,
+	.port_set_param = impl_node_port_set_param,
+	.port_use_buffers = impl_node_port_use_buffers,
+	.port_set_io = impl_node_port_set_io,
+	.port_reuse_buffer = impl_node_port_reuse_buffer,
+	.process = impl_node_process,
+};
+
+static int impl_get_interface(struct spa_handle *handle, const char *type, void **interface)
+{
+	struct 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;
+	uint32_t i;
+
+	spa_return_val_if_fail(handle != NULL, -EINVAL);
+
+	this = (struct impl *) handle;
+
+	for (i = 0; i < MAX_PORTS; i++)
+		free(this->in_ports[i]);
+	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;
+	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);
+	spa_log_topic_init(this->log, log_topic);
+
+	this->cpu = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_CPU);
+	if (this->cpu) {
+		this->cpu_flags = spa_cpu_get_flags(this->cpu);
+		this->max_align = SPA_MIN(MAX_ALIGN, spa_cpu_get_max_align(this->cpu));
+	}
+
+	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);
+	}
+
+	spa_hook_list_init(&this->hooks);
+
+	this->node.iface = SPA_INTERFACE_INIT(
+			SPA_TYPE_INTERFACE_Node,
+			SPA_VERSION_NODE,
+			&impl_node, this);
+	this->info = SPA_NODE_INFO_INIT();
+	this->info.max_input_ports = MAX_PORTS;
+	this->info.max_output_ports = 1;
+	this->info.change_mask |= SPA_NODE_CHANGE_MASK_FLAGS;
+	this->info.flags = SPA_NODE_FLAG_RT | SPA_NODE_FLAG_IN_DYNAMIC_PORTS;
+
+	port = GET_OUT_PORT(this, 0);
+	port->valid = true;
+	port->direction = SPA_DIRECTION_OUTPUT;
+	port->id = 0;
+	port->info = SPA_PORT_INFO_INIT();
+	port->info.change_mask |= SPA_PORT_CHANGE_MASK_FLAGS;
+	port->info.flags = SPA_PORT_FLAG_DYNAMIC_DATA;
+	port->info.change_mask |= SPA_PORT_CHANGE_MASK_PARAMS;
+	port->params[0] = SPA_PARAM_INFO(SPA_PARAM_EnumFormat, SPA_PARAM_INFO_READ);
+	port->params[1] = SPA_PARAM_INFO(SPA_PARAM_Meta, SPA_PARAM_INFO_READ);
+	port->params[2] = SPA_PARAM_INFO(SPA_PARAM_IO, SPA_PARAM_INFO_READ);
+	port->params[3] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
+	port->params[4] = SPA_PARAM_INFO(SPA_PARAM_Buffers, 0);
+	port->info.params = port->params;
+	port->info.n_params = 5;
+
+	spa_list_init(&port->queue);
+
+	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;
+}
+
+const struct spa_handle_factory spa_mixer_dsp_factory = {
+	SPA_VERSION_HANDLE_FACTORY,
+	SPA_NAME_AUDIO_MIXER_DSP,
+	NULL,
+	impl_get_size,
+	impl_init,
+	impl_enum_interface_info,
+};
diff --git a/spa/plugins/audiomixer/plugin.c b/spa/plugins/audiomixer/plugin.c
new file mode 100644
index 0000000..3915425
--- /dev/null
+++ b/spa/plugins/audiomixer/plugin.c
@@ -0,0 +1,50 @@
+/* Spa Audiomixer plugin
+ *
+ * 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 <errno.h>
+
+#include <spa/support/plugin.h>
+
+extern const struct spa_handle_factory spa_audiomixer_factory;
+extern const struct spa_handle_factory spa_mixer_dsp_factory;
+
+SPA_EXPORT
+int spa_handle_factory_enum(const struct spa_handle_factory **factory, uint32_t *index)
+{
+	spa_return_val_if_fail(factory != NULL, -EINVAL);
+	spa_return_val_if_fail(index != NULL, -EINVAL);
+
+	switch (*index) {
+	case 0:
+		*factory = &spa_audiomixer_factory;
+		break;
+	case 1:
+		*factory = &spa_mixer_dsp_factory;
+		break;
+	default:
+		return 0;
+	}
+	(*index)++;
+	return 1;
+}
diff --git a/spa/plugins/audiomixer/test-helper.h b/spa/plugins/audiomixer/test-helper.h
new file mode 100644
index 0000000..8c789bd
--- /dev/null
+++ b/spa/plugins/audiomixer/test-helper.h
@@ -0,0 +1,97 @@
+#include <dlfcn.h>
+
+#include <spa/support/plugin.h>
+#include <spa/utils/type.h>
+#include <spa/utils/result.h>
+#include <spa/support/cpu.h>
+#include <spa/utils/names.h>
+
+static inline const struct spa_handle_factory *get_factory(spa_handle_factory_enum_func_t enum_func,
+		const char *name, uint32_t version)
+{
+	uint32_t i;
+	int res;
+	const struct spa_handle_factory *factory;
+
+	for (i = 0;;) {
+		if ((res = enum_func(&factory, &i)) <= 0) {
+			if (res < 0)
+				errno = -res;
+			break;
+		}
+		if (factory->version >= version &&
+		    !strcmp(factory->name, name))
+			return factory;
+	}
+	return NULL;
+}
+
+static inline struct spa_handle *load_handle(const struct spa_support *support,
+		uint32_t n_support, const char *lib, const char *name)
+{
+	int res, len;
+	void *hnd;
+	spa_handle_factory_enum_func_t enum_func;
+	const struct spa_handle_factory *factory;
+	struct spa_handle *handle;
+	const char *str;
+	char *path;
+
+	if ((str = getenv("SPA_PLUGIN_DIR")) == NULL)
+		str = PLUGINDIR;
+
+	len = strlen(str) + strlen(lib) + 2;
+	path = alloca(len);
+	snprintf(path, len, "%s/%s", str, lib);
+
+	if ((hnd = dlopen(path, RTLD_NOW)) == NULL) {
+		fprintf(stderr, "can't load %s: %s\n", lib, dlerror());
+		res = -ENOENT;
+		goto error;
+	}
+	if ((enum_func = dlsym(hnd, SPA_HANDLE_FACTORY_ENUM_FUNC_NAME)) == NULL) {
+		fprintf(stderr, "can't find enum function\n");
+		res = -ENXIO;
+		goto error_close;
+	}
+
+	if ((factory = get_factory(enum_func, name, SPA_VERSION_HANDLE_FACTORY)) == NULL) {
+		fprintf(stderr, "can't find factory\n");
+		res = -ENOENT;
+		goto error_close;
+	}
+	handle = calloc(1, spa_handle_factory_get_size(factory, NULL));
+	if ((res = spa_handle_factory_init(factory, handle,
+					NULL, support, n_support)) < 0) {
+		fprintf(stderr, "can't make factory instance: %d\n", res);
+		goto error_close;
+	}
+	return handle;
+
+error_close:
+	dlclose(hnd);
+error:
+	errno = -res;
+	return NULL;
+}
+
+static inline uint32_t get_cpu_flags(void)
+{
+	struct spa_handle *handle;
+	uint32_t flags;
+	void *iface;
+	int res;
+
+	handle = load_handle(NULL, 0, "support/libspa-support.so", SPA_NAME_SUPPORT_CPU);
+	if (handle == NULL)
+		return 0;
+	if ((res = spa_handle_get_interface(handle, SPA_TYPE_INTERFACE_CPU, &iface)) < 0) {
+		fprintf(stderr, "can't get CPU interface %s\n", spa_strerror(res));
+		return 0;
+	}
+	flags = spa_cpu_get_flags((struct spa_cpu*)iface);
+
+	free(handle);
+
+	return flags;
+}
diff --git a/spa/plugins/audiomixer/test-mix-ops.c b/spa/plugins/audiomixer/test-mix-ops.c
new file mode 100644
index 0000000..a20f7a4
--- /dev/null
+++ b/spa/plugins/audiomixer/test-mix-ops.c
@@ -0,0 +1,293 @@
+/* Spa
+ *
+ * Copyright © 2022 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 "config.h"
+
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <time.h>
+
+#include <spa/debug/mem.h>
+
+#include "test-helper.h"
+#include "mix-ops.c"
+
+static uint32_t cpu_flags;
+
+#define N_SAMPLES 1024
+
+static uint8_t samp_out[N_SAMPLES * 8];
+
+static void compare_mem(int i, int j, const void *m1, const void *m2, size_t size)
+{
+	int res = memcmp(m1, m2, size);
+	if (res != 0) {
+		fprintf(stderr, "%d %d %zd:\n", i, j, size);
+		spa_debug_mem(0, m1, size);
+		spa_debug_mem(0, m2, size);
+	}
+	spa_assert_se(res == 0);
+}
+
+static int run_test(const char *name, const void *src[], uint32_t n_src, const void *dst,
+		size_t dst_size, uint32_t n_samples, mix_func_t mix)
+{
+	struct mix_ops ops;
+
+	ops.fmt = SPA_AUDIO_FORMAT_F32;
+	ops.n_channels = 1;
+	ops.cpu_flags = cpu_flags;
+	mix_ops_init(&ops);
+
+	fprintf(stderr, "%s\n", name);
+
+	mix(&ops, (void *)samp_out, src, n_src, n_samples);
+	compare_mem(0, 0, samp_out, dst, dst_size);
+	return 0;
+}
+
+static void test_s8(void)
+{
+	int8_t out[] = { 0x00, 0x00, 0x00, 0x00 };
+	int8_t in_1[] = { 0x00, 0x00, 0x00, 0x00 };
+	int8_t in_2[] = { 0x7f, 0x80, 0x40, 0xc0 };
+	int8_t in_3[] = { 0x40, 0xc0, 0xc0, 0x40 };
+	int8_t in_4[] = { 0xc0, 0x40, 0x40, 0xc0 };
+	int8_t out_4[] = { 0x7f, 0x80, 0x40, 0xc0 };
+	const void *src[6] = { in_1, in_2, in_3, in_4 };
+
+	run_test("test_s8_0", NULL, 0, out, sizeof(out), SPA_N_ELEMENTS(out), mix_s8_c);
+	run_test("test_s8_1", src, 1, in_1, sizeof(in_1), SPA_N_ELEMENTS(in_1), mix_s8_c);
+	run_test("test_s8_4", src, 4, out_4, sizeof(out_4), SPA_N_ELEMENTS(out_4), mix_s8_c);
+}
+
+static void test_u8(void)
+{
+	uint8_t out[] = { 0x80, 0x80, 0x80, 0x80 };
+	uint8_t in_1[] = { 0x80, 0x80, 0x80, 0x80 };
+	uint8_t in_2[] = { 0xff, 0x00, 0xc0, 0x40 };
+	uint8_t in_3[] = { 0xc0, 0x40, 0x40, 0xc0 };
+	uint8_t in_4[] = { 0x40, 0xc0, 0xc0, 0x40 };
+	uint8_t out_4[] = { 0xff, 0x00, 0xc0, 0x40 };
+	const void *src[6] = { in_1, in_2, in_3, in_4 };
+
+	run_test("test_u8_0", NULL, 0, out, sizeof(out), SPA_N_ELEMENTS(out), mix_u8_c);
+	run_test("test_u8_1", src, 1, in_1, sizeof(in_1), SPA_N_ELEMENTS(in_1), mix_u8_c);
+	run_test("test_u8_4", src, 4, out_4, sizeof(out_4), SPA_N_ELEMENTS(out_4), mix_u8_c);
+}
+
+static void test_s16(void)
+{
+	int16_t out[] = { 0x0000, 0x0000, 0x0000, 0x0000 };
+	int16_t in_1[] = { 0x0000, 0x0000, 0x0000, 0x0000 };
+	int16_t in_2[] = { 0x7fff, 0x8000, 0x4000, 0xc000 };
+	int16_t in_3[] = { 0x4000, 0xc000, 0xc000, 0x4000 };
+	int16_t in_4[] = { 0xc000, 0x4000, 0x4000, 0xc000 };
+	int16_t out_4[] = { 0x7fff, 0x8000, 0x4000, 0xc000 };
+	const void *src[6] = { in_1, in_2, in_3, in_4 };
+
+	run_test("test_s16_0", NULL, 0, out, sizeof(out), SPA_N_ELEMENTS(out), mix_s16_c);
+	run_test("test_s16_1", src, 1, in_1, sizeof(in_1), SPA_N_ELEMENTS(in_1), mix_s16_c);
+	run_test("test_s16_4", src, 4, out_4, sizeof(out_4), SPA_N_ELEMENTS(out_4), mix_s16_c);
+}
+
+static void test_u16(void)
+{
+	uint16_t out[] = { 0x8000, 0x8000, 0x8000, 0x8000 };
+	uint16_t in_1[] = { 0x8000, 0x8000, 0x8000 , 0x8000};
+	uint16_t in_2[] = { 0xffff, 0x0000, 0xc000, 0x4000 };
+	uint16_t in_3[] = { 0xc000, 0x4000, 0x4000, 0xc000 };
+	uint16_t in_4[] = { 0x4000, 0xc000, 0xc000, 0x4000 };
+	uint16_t out_4[] = { 0xffff, 0x0000, 0xc000, 0x4000 };
+	const void *src[6] = { in_1, in_2, in_3, in_4 };
+
+	run_test("test_u16_0", NULL, 0, out, sizeof(out), SPA_N_ELEMENTS(out), mix_u16_c);
+	run_test("test_u16_1", src, 1, in_1, sizeof(in_1), SPA_N_ELEMENTS(in_1), mix_u16_c);
+	run_test("test_u16_4", src, 4, out_4, sizeof(out_4), SPA_N_ELEMENTS(out_4), mix_u16_c);
+}
+
+static void test_s24(void)
+{
+	int24_t out[] = { S32_TO_S24(0x000000), S32_TO_S24(0x000000), S32_TO_S24(0x000000) };
+	int24_t in_1[] = { S32_TO_S24(0x000000), S32_TO_S24(0x000000), S32_TO_S24(0x000000) };
+	int24_t in_2[] = { S32_TO_S24(0x7fffff), S32_TO_S24(0xff800000), S32_TO_S24(0x400000) };
+	int24_t in_3[] = { S32_TO_S24(0x400000), S32_TO_S24(0xffc00000), S32_TO_S24(0xffc00000) };
+	int24_t in_4[] = { S32_TO_S24(0xffc00000), S32_TO_S24(0x400000), S32_TO_S24(0x400000) };
+	int24_t out_4[] = { S32_TO_S24(0x7fffff), S32_TO_S24(0xff800000), S32_TO_S24(0x400000) };
+	const void *src[6] = { in_1, in_2, in_3, in_4 };
+
+	run_test("test_s24_0", NULL, 0, out, sizeof(out), SPA_N_ELEMENTS(out), mix_s24_c);
+	run_test("test_s24_1", src, 1, in_1, sizeof(in_1), SPA_N_ELEMENTS(in_1), mix_s24_c);
+	run_test("test_s24_4", src, 4, out_4, sizeof(out_4), SPA_N_ELEMENTS(out_4), mix_s24_c);
+}
+
+static void test_u24(void)
+{
+	uint24_t out[] = { U32_TO_U24(0x800000), U32_TO_U24(0x800000), U32_TO_U24(0x800000) };
+	uint24_t in_1[] = { U32_TO_U24(0x800000), U32_TO_U24(0x800000), U32_TO_U24(0x800000) };
+	uint24_t in_2[] = { U32_TO_U24(0xffffffff), U32_TO_U24(0x000000), U32_TO_U24(0xffc00000) };
+	uint24_t in_3[] = { U32_TO_U24(0xffc00000), U32_TO_U24(0x400000), U32_TO_U24(0x400000) };
+	uint24_t in_4[] = { U32_TO_U24(0x400000), U32_TO_U24(0xffc00000), U32_TO_U24(0xffc00000) };
+	uint24_t out_4[] = { U32_TO_U24(0xffffffff), U32_TO_U24(0x000000), U32_TO_U24(0xffc00000) };
+	const void *src[6] = { in_1, in_2, in_3, in_4 };
+
+	run_test("test_u24_0", NULL, 0, out, sizeof(out), SPA_N_ELEMENTS(out), mix_u24_c);
+	run_test("test_u24_1", src, 1, in_1, sizeof(in_1), SPA_N_ELEMENTS(in_1), mix_u24_c);
+	run_test("test_u24_4", src, 4, out_4, sizeof(out_4), SPA_N_ELEMENTS(out_4), mix_u24_c);
+}
+
+static void test_s32(void)
+{
+	int32_t out[] = { 0x00000000, 0x00000000, 0x00000000, 0x00000000 };
+	int32_t in_1[] = { 0x00000000, 0x00000000, 0x00000000, 0x00000000 };
+	int32_t in_2[] = { 0x7fffffff, 0x80000000, 0x40000000, 0xc0000000 };
+	int32_t in_3[] = { 0x40000000, 0xc0000000, 0xc0000000, 0x40000000 };
+	int32_t in_4[] = { 0xc0000000, 0x40000000, 0x40000000, 0xc0000000 };
+	int32_t out_4[] = { 0x7fffffff, 0x80000000, 0x40000000, 0xc0000000 };
+	const void *src[6] = { in_1, in_2, in_3, in_4 };
+
+	run_test("test_s32_0", NULL, 0, out, sizeof(out), SPA_N_ELEMENTS(out), mix_s32_c);
+	run_test("test_s32_1", src, 1, in_1, sizeof(in_1), SPA_N_ELEMENTS(in_1), mix_s32_c);
+	run_test("test_s32_4", src, 4, out_4, sizeof(out_4), SPA_N_ELEMENTS(out_4), mix_s32_c);
+}
+
+static void test_u32(void)
+{
+	uint32_t out[] = { 0x80000000, 0x80000000, 0x80000000, 0x80000000 };
+	uint32_t in_1[] = { 0x80000000, 0x80000000, 0x80000000, 0x80000000 };
+	uint32_t in_2[] = { 0xffffffff, 0x00000000, 0xc0000000, 0x40000000 };
+	uint32_t in_3[] = { 0xc0000000, 0x40000000, 0x40000000, 0xc0000000 };
+	uint32_t in_4[] = { 0x40000000, 0xc0000000, 0xc0000000, 0x40000000 };
+	uint32_t out_4[] = { 0xffffffff, 0x00000000, 0xc0000000, 0x40000000 };
+	const void *src[6] = { in_1, in_2, in_3, in_4 };
+
+	run_test("test_u32_0", NULL, 0, out, sizeof(out), SPA_N_ELEMENTS(out), mix_u32_c);
+	run_test("test_u32_1", src, 1, in_1, sizeof(in_1), SPA_N_ELEMENTS(in_1), mix_u32_c);
+	run_test("test_u32_4", src, 4, out_4, sizeof(out_4), SPA_N_ELEMENTS(out_4), mix_u32_c);
+}
+
+static void test_s24_32(void)
+{
+	int32_t out[] = { 0x000000, 0x000000, 0x000000, 0x000000 };
+	int32_t in_1[] = { 0x000000, 0x000000, 0x000000, 0x000000 };
+	int32_t in_2[] = { 0x7fffff, 0xff800000, 0x400000, 0xffc00000 };
+	int32_t in_3[] = { 0x400000, 0xffc00000, 0xffc00000, 0x400000 };
+	int32_t in_4[] = { 0xffc00000, 0x400000, 0x400000, 0xffc00000 };
+	int32_t out_4[] = { 0x7fffff, 0xff800000, 0x400000, 0xffc00000 };
+	const void *src[6] = { in_1, in_2, in_3, in_4 };
+
+	run_test("test_s24_32_0", NULL, 0, out, sizeof(out), SPA_N_ELEMENTS(out), mix_s24_32_c);
+	run_test("test_s24_32_1", src, 1, in_1, sizeof(in_1), SPA_N_ELEMENTS(in_1), mix_s24_32_c);
+	run_test("test_s24_32_4", src, 4, out_4, sizeof(out_4), SPA_N_ELEMENTS(out_4), mix_s24_32_c);
+}
+
+static void test_u24_32(void)
+{
+	uint32_t out[] = { 0x800000, 0x800000, 0x800000, 0x800000 };
+	uint32_t in_1[] = { 0x800000, 0x800000, 0x800000, 0x800000 };
+	uint32_t in_2[] = { 0xffffff, 0x000000, 0xc00000, 0x400000 };
+	uint32_t in_3[] = { 0xc00000, 0x400000, 0x400000, 0xc00000 };
+	uint32_t in_4[] = { 0x400000, 0xc00000, 0xc00000, 0x400000 };
+	uint32_t out_4[] = { 0xffffff, 0x000000, 0xc00000, 0x400000 };
+	const void *src[6] = { in_1, in_2, in_3, in_4 };
+
+	run_test("test_u24_32_0", NULL, 0, out, sizeof(out), SPA_N_ELEMENTS(out), mix_u24_32_c);
+	run_test("test_u24_32_1", src, 1, in_1, sizeof(in_1), SPA_N_ELEMENTS(in_1), mix_u24_32_c);
+	run_test("test_u24_32_4", src, 4, out_4, sizeof(out_4), SPA_N_ELEMENTS(out_4), mix_u24_32_c);
+}
+
+static void test_f32(void)
+{
+	float out[] = { 0.0f, 0.0f, 0.0f, 0.0f };
+	float in_1[] = { 0.0f, 0.0f, 0.0f, 0.0f };
+	float in_2[] = { 1.0f, -1.0f, 0.5f, -0.5f };
+	float in_3[] = { 0.5f, -0.5f, -0.5f, 0.5f };
+	float in_4[] = { -0.5f, 1.0f, 0.5f, -0.5f };
+	float out_4[] = { 1.0f, -0.5f, 0.5f, -0.5f };
+	const void *src[6] = { in_1, in_2, in_3, in_4 };
+
+	run_test("test_f32_0", NULL, 0, out, sizeof(out), SPA_N_ELEMENTS(out), mix_f32_c);
+	run_test("test_f32_1", src, 1, in_1, sizeof(in_1), SPA_N_ELEMENTS(in_1), mix_f32_c);
+	run_test("test_f32_4", src, 4, out_4, sizeof(out_4), SPA_N_ELEMENTS(out_4), mix_f32_c);
+#if defined(HAVE_SSE)
+	if (cpu_flags & SPA_CPU_FLAG_SSE) {
+		run_test("test_f32_0_sse", NULL, 0, out, sizeof(out), SPA_N_ELEMENTS(out), mix_f32_sse);
+		run_test("test_f32_1_sse", src, 1, in_1, sizeof(in_1), SPA_N_ELEMENTS(in_1), mix_f32_sse);
+		run_test("test_f32_4_sse", src, 4, out_4, sizeof(out_4), SPA_N_ELEMENTS(out_4), mix_f32_sse);
+	}
+#endif
+#if defined(HAVE_AVX)
+	if (cpu_flags & SPA_CPU_FLAG_AVX) {
+		run_test("test_f32_0_avx", NULL, 0, out, sizeof(out), SPA_N_ELEMENTS(out), mix_f32_avx);
+		run_test("test_f32_1_avx", src, 1, in_1, sizeof(in_1), SPA_N_ELEMENTS(in_1), mix_f32_avx);
+		run_test("test_f32_4_avx", src, 4, out_4, sizeof(out_4), SPA_N_ELEMENTS(out_4), mix_f32_avx);
+	}
+#endif
+}
+
+static void test_f64(void)
+{
+	double out[] = { 0.0, 0.0, 0.0, 0.0 };
+	double in_1[] = { 0.0, 0.0, 0.0, 0.0 };
+	double in_2[] = { 1.0, -1.0, 0.5, -0.5 };
+	double in_3[] = { 0.5, -0.5, -0.5, 0.5 };
+	double in_4[] = { -0.5, 1.0, 0.5, -0.5 };
+	double out_4[] = { 1.0, -0.5, 0.5, -0.5 };
+	const void *src[6] = { in_1, in_2, in_3, in_4 };
+
+	run_test("test_f64_0", NULL, 0, out, sizeof(out), SPA_N_ELEMENTS(out), mix_f64_c);
+	run_test("test_f64_1", src, 1, in_1, sizeof(in_1), SPA_N_ELEMENTS(in_1), mix_f64_c);
+	run_test("test_f64_4", src, 4, out_4, sizeof(out_4), SPA_N_ELEMENTS(out_4), mix_f64_c);
+#if defined(HAVE_SSE2)
+	if (cpu_flags & SPA_CPU_FLAG_SSE2) {
+		run_test("test_f64_0_sse2", NULL, 0, out, sizeof(out), SPA_N_ELEMENTS(out), mix_f64_sse2);
+		run_test("test_f64_1_sse2", src, 1, in_1, sizeof(in_1), SPA_N_ELEMENTS(in_1), mix_f64_sse2);
+		run_test("test_f64_4_sse2", src, 4, out_4, sizeof(out_4), SPA_N_ELEMENTS(out_4), mix_f64_sse2);
+	}
+#endif
+}
+
+int main(int argc, char *argv[])
+{
+	cpu_flags = get_cpu_flags();
+	printf("got get CPU flags %d\n", cpu_flags);
+
+	test_s8();
+	test_u8();
+	test_s16();
+	test_u16();
+	test_s24();
+	test_u24();
+	test_s32();
+	test_u32();
+	test_s24_32();
+	test_u24_32();
+	test_f32();
+	test_f64();
+
+	return 0;
+}