Adding upstream version 0.3.65.upstream/0.3.65upstream

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

3 files changed, 947 insertions, 0 deletions

diff --git a/spa/plugins/volume/meson.build b/spa/plugins/volume/meson.build
new file mode 100644
index 0000000..2445e2b
--- /dev/null
+++ b/spa/plugins/volume/meson.build
@@ -0,0 +1,7 @@
+volume_sources = ['volume.c', 'plugin.c']
+
+volumelib = shared_library('spa-volume',
+  volume_sources,
+  dependencies : [ spa_dep ],
+  install : true,
+  install_dir : spa_plugindir / 'volume')
diff --git a/spa/plugins/volume/plugin.c b/spa/plugins/volume/plugin.c
new file mode 100644
index 0000000..2ceb250
--- /dev/null
+++ b/spa/plugins/volume/plugin.c
@@ -0,0 +1,46 @@
+/* Spa Volume 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_volume_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_volume_factory;
+		break;
+	default:
+		return 0;
+	}
+	(*index)++;
+	return 1;
+}
diff --git a/spa/plugins/volume/volume.c b/spa/plugins/volume/volume.c
new file mode 100644
index 0000000..6323766
--- /dev/null
+++ b/spa/plugins/volume/volume.c
@@ -0,0 +1,894 @@
+/* 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 <stddef.h>
+
+#include <spa/support/plugin.h>
+#include <spa/support/log.h>
+#include <spa/utils/list.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>
+
+#define NAME "volume"
+
+#define DEFAULT_RATE		48000
+#define DEFAULT_CHANNELS	2
+
+#define DEFAULT_VOLUME 1.0
+#define DEFAULT_MUTE false
+
+struct props {
+	double volume;
+	bool mute;
+};
+
+static void reset_props(struct props *props)
+{
+	props->volume = DEFAULT_VOLUME;
+	props->mute = DEFAULT_MUTE;
+}
+
+#define MAX_BUFFERS     16
+
+struct buffer {
+	uint32_t id;
+#define BUFFER_FLAG_OUT	(1<<0)
+	uint32_t flags;
+	struct spa_buffer *outbuf;
+	struct spa_meta_header *h;
+	void *ptr;
+	size_t size;
+	struct spa_list link;
+};
+
+struct port {
+	enum spa_direction direction;
+	uint32_t id;
+
+	bool have_format;
+
+	uint64_t info_all;
+	struct spa_port_info info;
+	struct spa_param_info params[5];
+
+	struct buffer buffers[MAX_BUFFERS];
+	uint32_t n_buffers;
+
+	struct spa_io_buffers *io;
+
+	struct spa_list empty;
+};
+
+struct impl {
+	struct spa_handle handle;
+	struct spa_node node;
+
+	struct spa_log *log;
+	uint32_t quantum_limit;
+
+	uint64_t info_all;
+	struct spa_node_info info;
+	struct spa_param_info params[5];
+	struct props props;
+
+	struct spa_hook_list hooks;
+
+	struct spa_audio_info current_format;
+	int bpf;
+
+	struct port in_ports[1];
+	struct port out_ports[1];
+
+	bool started;
+};
+
+#define CHECK_IN_PORT(this,d,p)  ((d) == SPA_DIRECTION_INPUT && (p) == 0)
+#define CHECK_OUT_PORT(this,d,p) ((d) == SPA_DIRECTION_OUTPUT && (p) == 0)
+#define CHECK_PORT(this,d,p)     ((p) == 0)
+#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)
+{
+	struct impl *this = object;
+	struct spa_pod_builder b = { 0 };
+	uint8_t buffer[1024];
+	struct spa_pod *param;
+	struct props *p;
+	struct spa_result_node_params result;
+	uint32_t count = 0;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(num != 0, -EINVAL);
+
+	p = &this->props;
+
+	result.id = id;
+	result.next = start;
+      next:
+	result.index = result.next++;
+
+	spa_pod_builder_init(&b, buffer, sizeof(buffer));
+
+	switch (id) {
+	case SPA_PARAM_PropInfo:
+		switch (result.index) {
+		case 0:
+			param = spa_pod_builder_add_object(&b,
+				SPA_TYPE_OBJECT_PropInfo, id,
+				SPA_PROP_INFO_id,   SPA_POD_Id(SPA_PROP_volume),
+				SPA_PROP_INFO_description, SPA_POD_String("The volume"),
+				SPA_PROP_INFO_type, SPA_POD_CHOICE_RANGE_Float(p->volume, 0.0, 10.0));
+			break;
+		case 1:
+			param = spa_pod_builder_add_object(&b,
+				SPA_TYPE_OBJECT_PropInfo, id,
+				SPA_PROP_INFO_id,   SPA_POD_Id(SPA_PROP_mute),
+				SPA_PROP_INFO_description, SPA_POD_String("Mute"),
+				SPA_PROP_INFO_type, SPA_POD_Bool(p->mute));
+			break;
+		default:
+			return 0;
+		}
+		break;
+	case SPA_PARAM_Props:
+		switch (result.index) {
+		case 0:
+			param = spa_pod_builder_add_object(&b,
+				SPA_TYPE_OBJECT_Props, id,
+				SPA_PROP_volume, SPA_POD_Float(p->volume),
+				SPA_PROP_mute,   SPA_POD_Bool(p->mute));
+			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 impl_node_set_io(void *object, uint32_t id, void *data, size_t size)
+{
+	return -ENOTSUP;
+}
+
+static int impl_node_set_param(void *object, uint32_t id, uint32_t flags,
+			       const struct spa_pod *param)
+{
+	struct impl *this = object;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	switch (id) {
+	case SPA_PARAM_Props:
+	{
+		struct props *p = &this->props;
+
+		if (param == NULL) {
+			reset_props(p);
+			return 0;
+		}
+		spa_pod_parse_object(param,
+			SPA_TYPE_OBJECT_Props, NULL,
+			SPA_PROP_volume, SPA_POD_OPT_Float(&p->volume),
+			SPA_PROP_mute,   SPA_POD_OPT_Bool(&p->mute));
+		break;
+	}
+	default:
+		return -ENOENT;
+	}
+
+	return 0;
+}
+
+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;
+
+	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_IN_PORT(this, 0), true);
+	emit_port_info(this, GET_OUT_PORT(this, 0), true);
+
+	spa_hook_list_join(&this->hooks, &save);
+
+	return 0;
+}
+
+static int
+impl_node_set_callbacks(void *object,
+			const struct spa_node_callbacks *callbacks,
+			void *data)
+{
+	return 0;
+}
+
+static int impl_node_add_port(void *object, enum spa_direction direction, uint32_t port_id,
+		const struct spa_dict *props)
+{
+	return -ENOTSUP;
+}
+
+static int
+impl_node_remove_port(void *object, enum spa_direction direction, uint32_t port_id)
+{
+	return -ENOTSUP;
+}
+
+static int port_enum_formats(void *object,
+			     enum spa_direction direction, uint32_t port_id,
+			     uint32_t index,
+			     const struct spa_pod *filter,
+			     struct spa_pod **param,
+			     struct spa_pod_builder *builder)
+{
+	switch (index) {
+	case 0:
+		*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_Id(2,
+							SPA_AUDIO_FORMAT_S16,
+							SPA_AUDIO_FORMAT_S16),
+			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_builder b = { 0 };
+	uint8_t buffer[1024];
+	struct spa_pod *param;
+	struct spa_result_node_params result;
+	uint32_t count = 0;
+	int res;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(num != 0, -EINVAL);
+	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+
+	port = 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, filter, &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->current_format.info.raw);
+		break;
+
+	case SPA_PARAM_Buffers:
+		if (!port->have_format)
+			return -EIO;
+		if (result.index > 0)
+			return 0;
+
+		param = spa_pod_builder_add_object(&b,
+			SPA_TYPE_OBJECT_ParamBuffers, id,
+			SPA_PARAM_BUFFERS_buffers, SPA_POD_CHOICE_RANGE_Int(2, 1, MAX_BUFFERS),
+			SPA_PARAM_BUFFERS_blocks,  SPA_POD_Int(1),
+			SPA_PARAM_BUFFERS_size,    SPA_POD_CHOICE_RANGE_Int(
+							this->quantum_limit * this->bpf,
+							16 * this->bpf,
+							INT32_MAX),
+			SPA_PARAM_BUFFERS_stride,  SPA_POD_Int(this->bpf));
+		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, NAME " %p: clear buffers", this);
+		port->n_buffers = 0;
+		spa_list_init(&port->empty);
+	}
+	return 0;
+}
+
+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) {
+		port->have_format = false;
+		clear_buffers(this, port);
+	} else {
+		struct spa_audio_info info = { 0 };
+
+		if ((res = spa_format_parse(format, &info.media_type, &info.media_subtype)) < 0)
+			return res;
+
+		if (info.media_type != SPA_MEDIA_TYPE_audio ||
+		    info.media_subtype != SPA_MEDIA_SUBTYPE_raw)
+			return -EINVAL;
+
+		if (spa_format_audio_raw_parse(format, &info.info.raw) < 0)
+			return -EINVAL;
+
+		if (info.info.raw.format != SPA_AUDIO_FORMAT_S16 ||
+		    info.info.raw.channels == 0 ||
+		    info.info.raw.channels > SPA_AUDIO_MAX_CHANNELS)
+			return -EINVAL;
+
+		this->bpf = 2 * info.info.raw.channels;
+		this->current_format = info;
+		port->have_format = true;
+	}
+
+	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)
+{
+	spa_return_val_if_fail(object != NULL, -EINVAL);
+
+	spa_return_val_if_fail(CHECK_PORT(object, direction, port_id), -EINVAL);
+
+	if (id == SPA_PARAM_Format) {
+		return port_set_format(object, 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_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->id = i;
+		b->outbuf = buffers[i];
+		b->flags = direction == SPA_DIRECTION_INPUT ? BUFFER_FLAG_OUT : 0;
+		b->h = spa_buffer_find_meta_data(buffers[i], SPA_META_Header, sizeof(*b->h));
+
+		if (d[0].data == NULL) {
+			b->ptr = d[0].data;
+			b->size = d[0].maxsize;
+		} else {
+			spa_log_error(this->log, NAME " %p: invalid memory on buffer %p", this,
+				      buffers[i]);
+			return -EINVAL;
+		}
+		if (!SPA_FLAG_IS_SET(b->flags, BUFFER_FLAG_OUT))
+			spa_list_append(&port->empty, &b->link);
+	}
+	port->n_buffers = n_buffers;
+
+	return 0;
+}
+
+static int
+impl_node_port_set_io(void *object,
+		      enum spa_direction direction,
+		      uint32_t port_id,
+		      uint32_t id,
+		      void *data, size_t size)
+{
+	struct impl *this = object;
+	struct port *port;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+
+	port = GET_PORT(this, direction, port_id);
+
+	switch (id) {
+	case SPA_IO_Buffers:
+		port->io = data;
+		break;
+	default:
+		return -ENOENT;
+	}
+	return 0;
+}
+
+static void recycle_buffer(struct impl *this, uint32_t id)
+{
+	struct port *port = GET_OUT_PORT(this, 0);
+	struct buffer *b = &port->buffers[id];
+
+	if (!SPA_FLAG_IS_SET(b->flags, BUFFER_FLAG_OUT)) {
+		spa_log_warn(this->log, NAME " %p: buffer %d not outstanding", this, id);
+		return;
+	}
+
+	spa_list_append(&port->empty, &b->link);
+	SPA_FLAG_CLEAR(b->flags, BUFFER_FLAG_OUT);
+	spa_log_trace(this->log, NAME " %p: recycle buffer %d", this, id);
+}
+
+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, port_id);
+
+	if (buffer_id >= port->n_buffers)
+		return -EINVAL;
+
+	recycle_buffer(this, buffer_id);
+
+	return 0;
+}
+
+static struct buffer *find_free_buffer(struct impl *this, struct port *port)
+{
+	struct buffer *b;
+
+	if (spa_list_is_empty(&port->empty))
+		return NULL;
+
+	b = spa_list_first(&port->empty, struct buffer, link);
+	spa_list_remove(&b->link);
+	SPA_FLAG_SET(b->flags, BUFFER_FLAG_OUT);
+
+	return b;
+}
+
+static void do_volume(struct impl *this, struct spa_buffer *dbuf, struct spa_buffer *sbuf)
+{
+	uint32_t i, n_samples, n_bytes;
+	struct spa_data *sd, *dd;
+	int16_t *src, *dst;
+	double volume;
+	uint32_t written, towrite, savail, davail;
+	uint32_t sindex, dindex;
+
+	volume = this->props.volume;
+
+	sd = sbuf->datas;
+	dd = dbuf->datas;
+
+	savail = SPA_MIN(sd[0].chunk->size, sd[0].maxsize);
+	sindex = sd[0].chunk->offset;
+	davail = 0;
+	dindex = 0;
+	davail = dd[0].maxsize - davail;
+
+	towrite = SPA_MIN(savail, davail);
+	written = 0;
+
+	while (written < towrite) {
+		uint32_t soffset = sindex % sd[0].maxsize;
+		uint32_t doffset = dindex % dd[0].maxsize;
+
+		src = SPA_PTROFF(sd[0].data, soffset, int16_t);
+		dst = SPA_PTROFF(dd[0].data, doffset, int16_t);
+
+		n_bytes = SPA_MIN(towrite, sd[0].maxsize - soffset);
+		n_bytes = SPA_MIN(n_bytes, dd[0].maxsize - doffset);
+
+		n_samples = n_bytes / sizeof(int16_t);
+		for (i = 0; i < n_samples; i++)
+			dst[i] = src[i] * volume;
+
+		sindex += n_bytes;
+		dindex += n_bytes;
+		written += n_bytes;
+	}
+	dd[0].chunk->offset = 0;
+	dd[0].chunk->size = written;
+	dd[0].chunk->stride = 0;
+}
+
+static int impl_node_process(void *object)
+{
+	struct impl *this = object;
+	struct port *in_port, *out_port;
+	struct spa_io_buffers *input, *output;
+	struct buffer *dbuf, *sbuf;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	out_port = GET_OUT_PORT(this, 0);
+	if ((output = out_port->io) == NULL)
+		return -EIO;
+
+	if (output->status == SPA_STATUS_HAVE_DATA)
+		return SPA_STATUS_HAVE_DATA;
+
+	/* recycle */
+	if (output->buffer_id < out_port->n_buffers) {
+		recycle_buffer(this, output->buffer_id);
+		output->buffer_id = SPA_ID_INVALID;
+	}
+
+	in_port = GET_IN_PORT(this, 0);
+	if ((input = in_port->io) == NULL)
+		return -EIO;
+
+	if (input->status != SPA_STATUS_HAVE_DATA)
+		return SPA_STATUS_NEED_DATA;
+
+	if (input->buffer_id >= in_port->n_buffers) {
+		input->status = -EINVAL;
+		return -EINVAL;
+	}
+
+	if ((dbuf = find_free_buffer(this, out_port)) == NULL) {
+                spa_log_error(this->log, NAME " %p: out of buffers", this);
+		return -EPIPE;
+	}
+
+	sbuf = &in_port->buffers[input->buffer_id];
+
+	spa_log_trace(this->log, NAME " %p: do volume %d -> %d", this, sbuf->id, dbuf->id);
+	do_volume(this, dbuf->outbuf, sbuf->outbuf);
+
+	output->buffer_id = dbuf->id;
+	output->status = SPA_STATUS_HAVE_DATA;
+
+	input->status = SPA_STATUS_NEED_DATA;
+
+	return SPA_STATUS_HAVE_DATA;
+}
+
+static const struct spa_node_methods impl_node = {
+	SPA_VERSION_NODE_METHODS,
+	.add_listener = impl_node_add_listener,
+	.set_callbacks = impl_node_set_callbacks,
+	.enum_params = impl_node_enum_params,
+	.set_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)
+{
+	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);
+
+	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_all = SPA_NODE_CHANGE_MASK_FLAGS |
+			SPA_NODE_CHANGE_MASK_PARAMS;
+	this->info = SPA_NODE_INFO_INIT();
+	this->info.max_input_ports = 1;
+	this->info.max_output_ports = 1;
+	this->info.flags = SPA_NODE_FLAG_RT;
+	this->params[0] = SPA_PARAM_INFO(SPA_PARAM_PropInfo, SPA_PARAM_INFO_READ);
+	this->params[1] = SPA_PARAM_INFO(SPA_PARAM_Props, SPA_PARAM_INFO_READWRITE);
+	this->info.params = this->params;
+	this->info.n_params = 2;
+	reset_props(&this->props);
+
+	port = GET_IN_PORT(this, 0);
+	port->direction = SPA_DIRECTION_INPUT;
+	port->id = 0;
+	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_IN_PLACE;
+	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->empty);
+
+	port = GET_OUT_PORT(this, 0);
+	port->direction = SPA_DIRECTION_OUTPUT;
+	port->id = 0;
+	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;
+	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->empty);
+
+	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_volume_factory = {
+	SPA_VERSION_HANDLE_FACTORY,
+	NAME,
+	NULL,
+	impl_get_size,
+	impl_init,
+	impl_enum_interface_info,
+};