1 files changed, 927 insertions, 0 deletions

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,
+};