Adding upstream version 0.3.65.upstream/0.3.65upstream

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

1 files changed, 964 insertions, 0 deletions

diff --git a/spa/plugins/alsa/alsa-pcm-source.c b/spa/plugins/alsa/alsa-pcm-source.c
new file mode 100644
index 0000000..f079bf6
--- /dev/null
+++ b/spa/plugins/alsa/alsa-pcm-source.c
@@ -0,0 +1,964 @@
+/* Spa ALSA Source
+ *
+ * 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 <stddef.h>
+
+#include <alsa/asoundlib.h>
+
+#include <spa/node/node.h>
+#include <spa/node/utils.h>
+#include <spa/node/keys.h>
+#include <spa/utils/keys.h>
+#include <spa/utils/names.h>
+#include <spa/utils/list.h>
+#include <spa/utils/string.h>
+#include <spa/monitor/device.h>
+#include <spa/param/audio/format.h>
+#include <spa/pod/filter.h>
+
+#include "alsa.h"
+
+#include "alsa-pcm.h"
+
+#define CHECK_PORT(this,d,p)    ((d) == SPA_DIRECTION_OUTPUT && (p) == 0)
+
+static const char default_device[] = "hw:0";
+
+static void reset_props(struct props *props)
+{
+	strncpy(props->device, default_device, 64);
+	props->use_chmap = DEFAULT_USE_CHMAP;
+}
+
+static void emit_node_info(struct state *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) {
+		struct spa_dict_item items[7];
+		uint32_t i, n_items = 0;
+		char latency[64], period[64], nperiods[64], headroom[64];
+
+		items[n_items++] = SPA_DICT_ITEM_INIT(SPA_KEY_DEVICE_API, "alsa");
+		items[n_items++] = SPA_DICT_ITEM_INIT(SPA_KEY_MEDIA_CLASS, "Audio/Source");
+		items[n_items++] = SPA_DICT_ITEM_INIT(SPA_KEY_NODE_DRIVER, "true");
+		if (this->have_format) {
+			snprintf(latency, sizeof(latency), "%lu/%d", this->buffer_frames / 2, this->rate);
+			items[n_items++] = SPA_DICT_ITEM_INIT(SPA_KEY_NODE_MAX_LATENCY, latency);
+			snprintf(period, sizeof(period), "%lu", this->period_frames);
+			items[n_items++] = SPA_DICT_ITEM_INIT("api.alsa.period-size", period);
+			snprintf(nperiods, sizeof(nperiods), "%lu", this->buffer_frames / this->period_frames);
+			items[n_items++] = SPA_DICT_ITEM_INIT("api.alsa.period-num", nperiods);
+			snprintf(headroom, sizeof(headroom), "%u", this->headroom);
+			items[n_items++] = SPA_DICT_ITEM_INIT("api.alsa.headroom", headroom);
+		}
+		this->info.props = &SPA_DICT_INIT(items, n_items);
+
+		if (this->info.change_mask & SPA_NODE_CHANGE_MASK_PARAMS) {
+			for (i = 0; i < this->info.n_params; i++) {
+				if (this->params[i].user > 0) {
+					this->params[i].flags ^= SPA_PARAM_INFO_SERIAL;
+					this->params[i].user = 0;
+				}
+			}
+		}
+		spa_node_emit_info(&this->hooks, &this->info);
+		this->info.change_mask = old;
+	}
+}
+
+static void emit_port_info(struct state *this, bool full)
+{
+	uint64_t old = full ? this->port_info.change_mask : 0;
+	if (full)
+		this->port_info.change_mask = this->port_info_all;
+	if (this->port_info.change_mask) {
+		uint32_t i;
+
+		if (this->port_info.change_mask & SPA_PORT_CHANGE_MASK_PARAMS) {
+			for (i = 0; i < this->port_info.n_params; i++) {
+				if (this->port_params[i].user > 0) {
+					this->port_params[i].flags ^= SPA_PARAM_INFO_SERIAL;
+					this->port_params[i].user = 0;
+				}
+			}
+		}
+		spa_node_emit_port_info(&this->hooks,
+				SPA_DIRECTION_OUTPUT, 0, &this->port_info);
+		this->port_info.change_mask = old;
+	}
+}
+
+
+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 state *this = object;
+	struct spa_pod *param;
+	uint8_t buffer[4096];
+	struct spa_pod_builder b = { 0 };
+	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_device),
+				SPA_PROP_INFO_name, SPA_POD_String(SPA_KEY_API_ALSA_PATH),
+				SPA_PROP_INFO_description, SPA_POD_String("The ALSA device"),
+				SPA_PROP_INFO_type, SPA_POD_Stringn(p->device, sizeof(p->device)));
+			break;
+		case 1:
+			param = spa_pod_builder_add_object(&b,
+				SPA_TYPE_OBJECT_PropInfo, id,
+				SPA_PROP_INFO_id,   SPA_POD_Id(SPA_PROP_deviceName),
+				SPA_PROP_INFO_description, SPA_POD_String("The ALSA device name"),
+				SPA_PROP_INFO_type, SPA_POD_Stringn(p->device_name, sizeof(p->device_name)));
+			break;
+		case 2:
+			param = spa_pod_builder_add_object(&b,
+				SPA_TYPE_OBJECT_PropInfo, id,
+				SPA_PROP_INFO_id,   SPA_POD_Id(SPA_PROP_cardName),
+				SPA_PROP_INFO_description, SPA_POD_String("The ALSA card name"),
+				SPA_PROP_INFO_type, SPA_POD_Stringn(p->card_name, sizeof(p->card_name)));
+			break;
+		case 3:
+			param = spa_pod_builder_add_object(&b,
+				SPA_TYPE_OBJECT_PropInfo, id,
+				SPA_PROP_INFO_id,   SPA_POD_Id(SPA_PROP_latencyOffsetNsec),
+				SPA_PROP_INFO_description, SPA_POD_String("Latency offset (ns)"),
+				SPA_PROP_INFO_type, SPA_POD_CHOICE_RANGE_Long(0LL, 0LL, 2 * SPA_NSEC_PER_SEC));
+			break;
+		default:
+			param = spa_alsa_enum_propinfo(this, result.index - 4, &b);
+			if (param == NULL)
+				return 0;
+		}
+		break;
+
+	case SPA_PARAM_Props:
+	{
+		struct spa_pod_frame f;
+
+		switch (result.index) {
+		case 0:
+			spa_pod_builder_push_object(&b, &f,
+                                SPA_TYPE_OBJECT_Props, id);
+			spa_pod_builder_add(&b,
+				SPA_PROP_device,       SPA_POD_Stringn(p->device, sizeof(p->device)),
+				SPA_PROP_deviceName,   SPA_POD_Stringn(p->device_name, sizeof(p->device_name)),
+				SPA_PROP_cardName,     SPA_POD_Stringn(p->card_name, sizeof(p->card_name)),
+				SPA_PROP_latencyOffsetNsec,   SPA_POD_Long(this->process_latency.ns),
+				0);
+			spa_alsa_add_prop_params(this, &b);
+			param = spa_pod_builder_pop(&b, &f);
+			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_Clock),
+				SPA_PARAM_IO_size, SPA_POD_Int(sizeof(struct spa_io_clock)));
+			break;
+		case 1:
+			param = spa_pod_builder_add_object(&b,
+				SPA_TYPE_OBJECT_ParamIO, id,
+				SPA_PARAM_IO_id,   SPA_POD_Id(SPA_IO_Position),
+				SPA_PARAM_IO_size, SPA_POD_Int(sizeof(struct spa_io_position)));
+			break;
+		default:
+			return 0;
+		}
+		break;
+
+	case SPA_PARAM_ProcessLatency:
+		switch (result.index) {
+		case 0:
+			param = spa_process_latency_build(&b, id, &this->process_latency);
+			break;
+		default:
+			return 0;
+		}
+		break;
+
+	default:
+		return -ENOENT;
+	}
+
+	if (spa_pod_filter(&b, &result.param, param, filter) < 0)
+		goto next;
+
+	spa_node_emit_result(&this->hooks, seq, 0, 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)
+{
+	struct state *this = object;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	switch (id) {
+	case SPA_IO_Clock:
+		if (size > 0 && size < sizeof(struct spa_io_clock))
+			return -EINVAL;
+		this->clock = data;
+		break;
+	case SPA_IO_Position:
+		this->position = data;
+		break;
+	default:
+		return -ENOENT;
+	}
+	spa_alsa_reassign_follower(this);
+	return 0;
+}
+
+static void handle_process_latency(struct state *this,
+		const struct spa_process_latency_info *info)
+{
+	bool ns_changed = this->process_latency.ns != info->ns;
+
+	if (this->process_latency.quantum == info->quantum &&
+	    this->process_latency.rate == info->rate &&
+	    !ns_changed)
+		return;
+
+	this->process_latency = *info;
+
+	this->info.change_mask |= SPA_NODE_CHANGE_MASK_PARAMS;
+	if (ns_changed)
+		this->params[NODE_Props].user++;
+	this->params[NODE_ProcessLatency].user++;
+
+	this->port_info.change_mask |= SPA_PORT_CHANGE_MASK_PARAMS;
+	this->port_params[PORT_Latency].user++;
+}
+
+static int impl_node_set_param(void *object, uint32_t id, uint32_t flags,
+			       const struct spa_pod *param)
+{
+	struct state *this = object;
+	int res;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	switch (id) {
+	case SPA_PARAM_Props:
+	{
+		struct props *p = &this->props;
+		struct spa_pod *params = NULL;
+		int64_t lat_ns = -1;
+
+		if (param == NULL) {
+			reset_props(p);
+			return 0;
+		}
+
+		spa_pod_parse_object(param,
+			SPA_TYPE_OBJECT_Props, NULL,
+			SPA_PROP_device,       SPA_POD_OPT_Stringn(p->device, sizeof(p->device)),
+			SPA_PROP_latencyOffsetNsec,   SPA_POD_OPT_Long(&lat_ns),
+			SPA_PROP_params,       SPA_POD_OPT_Pod(&params));
+
+		spa_alsa_parse_prop_params(this, params);
+		if (lat_ns != -1) {
+			struct spa_process_latency_info info;
+			info = this->process_latency;
+			info.ns = lat_ns;
+			handle_process_latency(this, &info);
+		}
+
+		emit_node_info(this, false);
+		emit_port_info(this, false);
+		break;
+	}
+	case SPA_PARAM_ProcessLatency:
+	{
+		struct spa_process_latency_info info;
+		if (param == NULL)
+			spa_zero(info);
+		else if ((res = spa_process_latency_parse(param, &info)) < 0)
+			return res;
+
+		handle_process_latency(this, &info);
+
+		emit_node_info(this, false);
+		emit_port_info(this, false);
+		break;
+	}
+	default:
+		return -ENOENT;
+	}
+
+	return 0;
+}
+
+static int impl_node_send_command(void *object, const struct spa_command *command)
+{
+	struct state *this = object;
+	int res;
+
+	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_ParamBegin:
+		if ((res = spa_alsa_open(this, NULL)) < 0)
+			return res;
+		break;
+	case SPA_NODE_COMMAND_ParamEnd:
+		if (this->have_format)
+			return 0;
+		if ((res = spa_alsa_close(this)) < 0)
+			return res;
+		break;
+	case SPA_NODE_COMMAND_Start:
+		if (!this->have_format)
+			return -EIO;
+		if (this->n_buffers == 0)
+			return -EIO;
+
+		if ((res = spa_alsa_start(this)) < 0)
+			return res;
+		break;
+	case SPA_NODE_COMMAND_Pause:
+	case SPA_NODE_COMMAND_Suspend:
+		if ((res = spa_alsa_pause(this)) < 0)
+			return res;
+		break;
+	default:
+		return -ENOTSUP;
+	}
+	return 0;
+}
+
+static int
+impl_node_add_listener(void *object,
+		struct spa_hook *listener,
+		const struct spa_node_events *events,
+		void *data)
+{
+	struct state *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, true);
+
+	spa_hook_list_join(&this->hooks, &save);
+
+	return 0;
+}
+
+static int
+impl_node_set_callbacks(void *object,
+			const struct spa_node_callbacks *callbacks,
+			void *data)
+{
+	struct state *this = object;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	this->callbacks = SPA_CALLBACKS_INIT(callbacks, data);
+
+	return 0;
+}
+
+static int impl_node_sync(void *object, int seq)
+{
+	struct state *this = object;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	spa_node_emit_result(&this->hooks, seq, 0, 0, NULL);
+
+	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
+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 state *this = object;
+	struct spa_pod *param;
+	struct spa_pod_builder b = { 0 };
+	uint8_t buffer[1024];
+	struct spa_result_node_params result;
+	uint32_t count = 0;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(num != 0, -EINVAL);
+
+	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+
+	result.id = id;
+	result.next = start;
+      next:
+	result.index = result.next++;
+
+	spa_pod_builder_init(&b, buffer, sizeof(buffer));
+
+	switch (id) {
+	case SPA_PARAM_EnumFormat:
+		return spa_alsa_enum_format(this, seq, start, num, filter);
+
+	case SPA_PARAM_Format:
+		if (!this->have_format)
+			return -EIO;
+		if (result.index > 0)
+			return 0;
+
+		param = spa_format_audio_raw_build(&b, id, &this->current_format.info.raw);
+		break;
+
+	case SPA_PARAM_Buffers:
+		if (!this->have_format)
+			return -EIO;
+		if (result.index > 0)
+			return 0;
+
+		param = spa_pod_builder_add_object(&b,
+			SPA_TYPE_OBJECT_ParamBuffers, id,
+			SPA_PARAM_BUFFERS_buffers, SPA_POD_CHOICE_RANGE_Int(2, 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->frame_size,
+							16 * this->frame_size,
+							INT32_MAX),
+			SPA_PARAM_BUFFERS_stride,  SPA_POD_Int(this->frame_size));
+		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;
+		case 1:
+			param = spa_pod_builder_add_object(&b,
+				SPA_TYPE_OBJECT_ParamIO, id,
+				SPA_PARAM_IO_id,   SPA_POD_Id(SPA_IO_RateMatch),
+				SPA_PARAM_IO_size, SPA_POD_Int(sizeof(struct spa_io_rate_match)));
+			break;
+		default:
+			return 0;
+		}
+		break;
+
+	case SPA_PARAM_Latency:
+		switch (result.index) {
+		case 0: case 1:
+		{
+			struct spa_latency_info latency = this->latency[result.index];
+			if (latency.direction == SPA_DIRECTION_OUTPUT)
+				spa_process_latency_info_add(&this->process_latency, &latency);
+			param = spa_latency_build(&b, id, &latency);
+			break;
+		}
+		default:
+			return 0;
+		}
+		break;
+
+	default:
+		return -ENOENT;
+	}
+
+	if (spa_pod_filter(&b, &result.param, param, filter) < 0)
+		goto next;
+
+	spa_node_emit_result(&this->hooks, seq, 0, SPA_RESULT_TYPE_NODE_PARAMS, &result);
+
+	if (++count != num)
+		goto next;
+
+	return 0;
+}
+
+static int clear_buffers(struct state *this)
+{
+	if (this->n_buffers > 0) {
+		spa_list_init(&this->free);
+		spa_list_init(&this->ready);
+		this->n_buffers = 0;
+	}
+	return 0;
+}
+
+static int port_set_format(void *object,
+			   enum spa_direction direction, uint32_t port_id,
+			   uint32_t flags, const struct spa_pod *format)
+{
+	struct state *this = object;
+	int err = 0;
+
+	if (format == NULL) {
+		if (!this->have_format)
+			return 0;
+
+		spa_log_debug(this->log, "clear format");
+		spa_alsa_close(this);
+		clear_buffers(this);
+	} else {
+		struct spa_audio_info info = { 0 };
+
+		if ((err = spa_format_parse(format, &info.media_type, &info.media_subtype)) < 0)
+			return err;
+
+		if (info.media_type != SPA_MEDIA_TYPE_audio ||
+		    info.media_subtype != SPA_MEDIA_SUBTYPE_raw)
+			return -EINVAL;
+
+		if (spa_format_audio_raw_parse(format, &info.info.raw) < 0)
+			return -EINVAL;
+
+		if ((err = spa_alsa_set_format(this, &info, flags)) < 0)
+			return err;
+
+		this->current_format = info;
+	}
+
+	this->info.change_mask |= SPA_NODE_CHANGE_MASK_PROPS;
+	emit_node_info(this, false);
+
+	this->port_info.change_mask |= SPA_PORT_CHANGE_MASK_RATE;
+	this->port_info.rate = SPA_FRACTION(1, this->rate);
+	this->port_info.change_mask |= SPA_PORT_CHANGE_MASK_PARAMS;
+	if (this->have_format) {
+		this->port_params[PORT_Format] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_READWRITE);
+		this->port_params[PORT_Buffers] = SPA_PARAM_INFO(SPA_PARAM_Buffers, SPA_PARAM_INFO_READ);
+		this->port_params[PORT_Latency].user++;
+	} else {
+		this->port_params[PORT_Format] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
+		this->port_params[PORT_Buffers] = SPA_PARAM_INFO(SPA_PARAM_Buffers, 0);
+	}
+	emit_port_info(this, false);
+
+	return err;
+}
+
+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 state *this = object;
+	int res;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+
+	switch (id) {
+	case SPA_PARAM_Format:
+		res = port_set_format(this, direction, port_id, flags, param);
+		break;
+	case SPA_PARAM_Latency:
+	{
+		struct spa_latency_info info;
+		if (param == NULL)
+			info = SPA_LATENCY_INFO(SPA_DIRECTION_REVERSE(direction));
+		else if ((res = spa_latency_parse(param, &info)) < 0)
+			return res;
+		if (direction == info.direction)
+			return -EINVAL;
+
+		this->latency[info.direction] = info;
+		this->port_info.change_mask |= SPA_PORT_CHANGE_MASK_PARAMS;
+		this->port_params[PORT_Latency].user++;
+		emit_port_info(this, false);
+		break;
+	}
+	default:
+		res = -ENOENT;
+		break;
+	}
+	return res;
+}
+
+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 state *this = object;
+	int res;
+	uint32_t i;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+
+	spa_log_debug(this->log, "%p: use %d buffers", this, n_buffers);
+
+	if (this->n_buffers > 0) {
+		spa_alsa_pause(this);
+		if ((res = clear_buffers(this)) < 0)
+			return res;
+	}
+	if (n_buffers > 0 && !this->have_format)
+		return -EIO;
+	if (n_buffers > MAX_BUFFERS)
+		return -ENOSPC;
+
+	for (i = 0; i < n_buffers; i++) {
+		struct buffer *b = &this->buffers[i];
+		struct spa_data *d = buffers[i]->datas;
+
+		b->buf = buffers[i];
+		b->id = i;
+		b->flags = 0;
+
+		b->h = spa_buffer_find_meta_data(b->buf, SPA_META_Header, sizeof(*b->h));
+
+		if (d[0].data == NULL) {
+			spa_log_error(this->log, "%p: need mapped memory", this);
+			return -EINVAL;
+		}
+		spa_list_append(&this->free, &b->link);
+	}
+	this->n_buffers = n_buffers;
+
+	return 0;
+}
+
+static int
+impl_node_port_set_io(void *object,
+		      enum spa_direction direction,
+		      uint32_t port_id,
+		      uint32_t id,
+		      void *data, size_t size)
+{
+	struct state *this = object;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+
+	spa_log_debug(this->log, "%p: io %d %p %zd", this, id, data, size);
+
+	switch (id) {
+	case SPA_IO_Buffers:
+		this->io = data;
+		break;
+	case SPA_IO_RateMatch:
+		this->rate_match = 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 state *this = object;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	spa_return_val_if_fail(port_id == 0, -EINVAL);
+
+	if (this->n_buffers == 0)
+		return -EIO;
+
+	if (buffer_id >= this->n_buffers)
+		return -EINVAL;
+
+	spa_alsa_recycle_buffer(this, buffer_id);
+
+	return 0;
+}
+
+static int impl_node_process(void *object)
+{
+	struct state *this = object;
+	struct spa_io_buffers *io;
+	struct buffer *b;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	if ((io = this->io) == NULL)
+		return -EIO;
+
+	spa_log_trace_fp(this->log, "%p; status %d", this, io->status);
+
+	if (io->status == SPA_STATUS_HAVE_DATA)
+		return SPA_STATUS_HAVE_DATA;
+
+	if (io->buffer_id < this->n_buffers) {
+		spa_alsa_recycle_buffer(this, io->buffer_id);
+		io->buffer_id = SPA_ID_INVALID;
+	}
+
+	if (spa_list_is_empty(&this->ready) && this->following) {
+		if (this->freewheel)
+			spa_alsa_skip(this);
+		else
+			spa_alsa_read(this);
+	}
+	if (spa_list_is_empty(&this->ready) || !this->following)
+		return SPA_STATUS_OK;
+
+	b = spa_list_first(&this->ready, struct buffer, link);
+	spa_list_remove(&b->link);
+	SPA_FLAG_SET(b->flags, BUFFER_FLAG_OUT);
+
+	spa_log_trace_fp(this->log, "%p: dequeue buffer %d", this, b->id);
+
+	io->buffer_id = b->id;
+	io->status = SPA_STATUS_HAVE_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,
+	.sync = impl_node_sync,
+	.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 state *this;
+
+	spa_return_val_if_fail(handle != NULL, -EINVAL);
+	spa_return_val_if_fail(interface != NULL, -EINVAL);
+
+	this = (struct state *) 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 state *this;
+	spa_return_val_if_fail(handle != NULL, -EINVAL);
+	this = (struct state *) handle;
+	spa_alsa_close(this);
+	spa_alsa_clear(this);
+	return 0;
+}
+
+static size_t
+impl_get_size(const struct spa_handle_factory *factory,
+	      const struct spa_dict *params)
+{
+	return sizeof(struct state);
+}
+
+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 state *this;
+
+	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 state *) handle;
+
+	this->log = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_Log);
+	alsa_log_topic_init(this->log);
+
+	this->data_system = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_DataSystem);
+	this->data_loop = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_DataLoop);
+
+	if (this->data_loop == NULL) {
+		spa_log_error(this->log, "%p: a data loop is needed", this);
+		return -EINVAL;
+	}
+	if (this->data_system == NULL) {
+		spa_log_error(this->log, "%p: a data system is needed", this);
+		return -EINVAL;
+	}
+
+	this->node.iface = SPA_INTERFACE_INIT(SPA_TYPE_INTERFACE_Node, SPA_VERSION_NODE, &impl_node, this);
+
+	spa_hook_list_init(&this->hooks);
+	this->stream = SND_PCM_STREAM_CAPTURE;
+	this->port_direction = SPA_DIRECTION_OUTPUT;
+	this->latency[this->port_direction] = SPA_LATENCY_INFO(
+			this->port_direction,
+			.min_quantum = 1.0f,
+			.max_quantum = 1.0f);
+	this->latency[SPA_DIRECTION_INPUT] = SPA_LATENCY_INFO(SPA_DIRECTION_INPUT);
+
+	this->info_all = SPA_NODE_CHANGE_MASK_FLAGS |
+			SPA_NODE_CHANGE_MASK_PROPS |
+			SPA_NODE_CHANGE_MASK_PARAMS;
+	this->info.max_output_ports = 1;
+	this->info.flags = SPA_NODE_FLAG_RT;
+	this->params[NODE_PropInfo] = SPA_PARAM_INFO(SPA_PARAM_PropInfo, SPA_PARAM_INFO_READ);
+	this->params[NODE_Props] = SPA_PARAM_INFO(SPA_PARAM_Props, SPA_PARAM_INFO_READWRITE);
+	this->params[NODE_IO] = SPA_PARAM_INFO(SPA_PARAM_IO, SPA_PARAM_INFO_READ);
+	this->params[NODE_ProcessLatency] = SPA_PARAM_INFO(SPA_PARAM_ProcessLatency, SPA_PARAM_INFO_READWRITE);
+	this->info.params = this->params;
+	this->info.n_params = N_NODE_PARAMS;
+	reset_props(&this->props);
+
+	this->port_info_all = SPA_PORT_CHANGE_MASK_FLAGS |
+			SPA_PORT_CHANGE_MASK_PARAMS;
+	this->port_info = SPA_PORT_INFO_INIT();
+	this->port_info.flags = SPA_PORT_FLAG_LIVE |
+			   SPA_PORT_FLAG_PHYSICAL |
+			   SPA_PORT_FLAG_TERMINAL;
+	this->port_params[PORT_EnumFormat] = SPA_PARAM_INFO(SPA_PARAM_EnumFormat, SPA_PARAM_INFO_READ);
+	this->port_params[PORT_Meta] = SPA_PARAM_INFO(SPA_PARAM_Meta, SPA_PARAM_INFO_READ);
+	this->port_params[PORT_IO] = SPA_PARAM_INFO(SPA_PARAM_IO, SPA_PARAM_INFO_READ);
+	this->port_params[PORT_Format] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
+	this->port_params[PORT_Buffers] = SPA_PARAM_INFO(SPA_PARAM_Buffers, 0);
+	this->port_params[PORT_Latency] = SPA_PARAM_INFO(SPA_PARAM_Latency, SPA_PARAM_INFO_READWRITE);
+	this->port_info.params = this->port_params;
+	this->port_info.n_params = N_PORT_PARAMS;
+
+	spa_list_init(&this->free);
+	spa_list_init(&this->ready);
+
+	return spa_alsa_init(this, info);
+}
+
+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);
+
+	if (*index >= SPA_N_ELEMENTS(impl_interfaces))
+		return 0;
+
+	*info = &impl_interfaces[(*index)++];
+
+	return 1;
+}
+
+static const struct spa_dict_item info_items[] = {
+	{ SPA_KEY_FACTORY_AUTHOR, "Wim Taymans <wim.taymans@gmail.com>" },
+	{ SPA_KEY_FACTORY_DESCRIPTION, "Record audio with the alsa API" },
+	{ SPA_KEY_FACTORY_USAGE, "["SPA_KEY_API_ALSA_PATH"=<device>]" },
+};
+
+static const struct spa_dict info = SPA_DICT_INIT_ARRAY(info_items);
+
+const struct spa_handle_factory spa_alsa_source_factory = {
+	SPA_VERSION_HANDLE_FACTORY,
+	SPA_NAME_API_ALSA_PCM_SOURCE,
+	&info,
+	impl_get_size,
+	impl_init,
+	impl_enum_interface_info,
+};