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pipewire/spa/plugins/alsa/alsa-sink.c
Wim Taymans 3f4ccaaea2 More hacking 
Add connection message for PORT_COMMAND
Add rtkit support to ask for realtime priority
work on stream states and improve negotiation
Rework of port linking works, keep separate state for realtime threads
and use message passing to update the state.
Don't try to link nodes that are removed.
Open the device in the ALSA monitor to detect source or sink
Implement send_command as async methods on the plugins, use async
replies to sync start and stop.
Work on alsa sink.
Implement async PAUSE/START on v4l2 src. move the STREAMON/OFF calls to
the mainloop because they have high latency, add the poll descriptors
from the data loop.
2016-10-28 16:56:33 +02:00

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/* Spa ALSA Sink
* Copyright (C) 2016 Wim Taymans <wim.taymans@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include <stddef.h>
#include <asoundlib.h>
#include <spa/node.h>
#include <spa/audio/format.h>
#include "alsa-utils.h"
#define CHECK_PORT(this,d,p) ((d) == SPA_DIRECTION_INPUT && (p) == 0)
typedef struct _SpaALSAState SpaALSASink;
static const char default_device[] = "default";
static const uint32_t default_buffer_time = 10000;
static const uint32_t default_period_time = 1000;
static const bool default_period_event = 0;
static void
reset_alsa_sink_props (SpaALSAProps *props)
{
strncpy (props->device, default_device, 64);
props->buffer_time = default_buffer_time;
props->period_time = default_period_time;
props->period_event = default_period_event;
}
static void
update_state (SpaALSASink *this, SpaNodeState state)
{
spa_log_info (this->log, "update state %d\n", state);
this->node.state = state;
}
static const uint32_t min_uint32 = 1;
static const uint32_t max_uint32 = UINT32_MAX;
static const SpaPropRangeInfo uint32_range[] = {
{ "min", { 4, &min_uint32 } },
{ "max", { 4, &max_uint32 } },
};
enum {
PROP_ID_DEVICE,
PROP_ID_DEVICE_NAME,
PROP_ID_CARD_NAME,
PROP_ID_BUFFER_TIME,
PROP_ID_PERIOD_TIME,
PROP_ID_PERIOD_EVENT,
PROP_ID_LAST,
};
static const SpaPropInfo prop_info[] =
{
{ PROP_ID_DEVICE, offsetof (SpaALSAProps, device),
"device",
SPA_PROP_FLAG_READWRITE,
SPA_PROP_TYPE_STRING, 63,
SPA_PROP_RANGE_TYPE_NONE, 0, NULL,
NULL },
{ PROP_ID_DEVICE_NAME, offsetof (SpaALSAProps, device_name),
"device-name",
SPA_PROP_FLAG_READABLE,
SPA_PROP_TYPE_STRING, 127,
SPA_PROP_RANGE_TYPE_NONE, 0, NULL,
NULL },
{ PROP_ID_CARD_NAME, offsetof (SpaALSAProps, card_name),
"card-name",
SPA_PROP_FLAG_READABLE,
SPA_PROP_TYPE_STRING, 127,
SPA_PROP_RANGE_TYPE_NONE, 0, NULL,
NULL },
{ PROP_ID_BUFFER_TIME, offsetof (SpaALSAProps, buffer_time),
"buffer-time",
SPA_PROP_FLAG_READWRITE,
SPA_PROP_TYPE_UINT32, sizeof (uint32_t),
SPA_PROP_RANGE_TYPE_MIN_MAX, 2, uint32_range,
NULL },
{ PROP_ID_PERIOD_TIME, offsetof (SpaALSAProps, period_time),
"period-time",
SPA_PROP_FLAG_READWRITE,
SPA_PROP_TYPE_UINT32, sizeof (uint32_t),
SPA_PROP_RANGE_TYPE_MIN_MAX, 2, uint32_range,
NULL },
{ PROP_ID_PERIOD_EVENT, offsetof (SpaALSAProps, period_event),
"period-event",
SPA_PROP_FLAG_READWRITE,
SPA_PROP_TYPE_BOOL, sizeof (bool),
SPA_PROP_RANGE_TYPE_NONE, 0, NULL,
NULL },
};
static SpaResult
spa_alsa_sink_node_get_props (SpaNode *node,
SpaProps **props)
{
SpaALSASink *this;
if (node == NULL || props == NULL)
return SPA_RESULT_INVALID_ARGUMENTS;
this = SPA_CONTAINER_OF (node, SpaALSASink, node);
memcpy (&this->props[0], &this->props[1], sizeof (this->props[1]));
*props = &this->props[0].props;
return SPA_RESULT_OK;
}
static SpaResult
spa_alsa_sink_node_set_props (SpaNode *node,
const SpaProps *props)
{
SpaALSASink *this;
SpaALSAProps *p;
SpaResult res;
if (node == NULL)
return SPA_RESULT_INVALID_ARGUMENTS;
this = SPA_CONTAINER_OF (node, SpaALSASink, node);
p = &this->props[1];
if (props == NULL) {
reset_alsa_sink_props (p);
return SPA_RESULT_OK;
}
res = spa_props_copy_values (props, &p->props);
return res;
}
static SpaResult
do_send_event (SpaPoll *poll,
bool async,
uint32_t seq,
size_t size,
void *data,
void *user_data)
{
SpaALSASink *this = user_data;
this->event_cb (&this->node, data, this->user_data);
return SPA_RESULT_OK;
}
static SpaResult
do_command (SpaPoll *poll,
bool async,
uint32_t seq,
size_t size,
void *data,
void *user_data)
{
SpaALSASink *this = user_data;
SpaResult res;
SpaNodeCommand *cmd = data;
SpaNodeEventAsyncComplete ac;
switch (cmd->type) {
case SPA_NODE_COMMAND_START:
case SPA_NODE_COMMAND_PAUSE:
res = spa_node_port_send_command (&this->node,
SPA_DIRECTION_INPUT,
0,
cmd);
break;
default:
res = SPA_RESULT_NOT_IMPLEMENTED;
break;
}
if (async) {
ac.event.type = SPA_NODE_EVENT_TYPE_ASYNC_COMPLETE;
ac.event.size = sizeof (SpaNodeEventAsyncComplete);
ac.seq = seq;
ac.res = res;
spa_poll_invoke (this->main_loop,
do_send_event,
SPA_ID_INVALID,
sizeof (ac),
&ac,
this);
}
return res;
}
static SpaResult
spa_alsa_sink_node_send_command (SpaNode *node,
SpaNodeCommand *command)
{
SpaALSASink *this;
if (node == NULL || command == NULL)
return SPA_RESULT_INVALID_ARGUMENTS;
this = SPA_CONTAINER_OF (node, SpaALSASink, node);
switch (command->type) {
case SPA_NODE_COMMAND_INVALID:
return SPA_RESULT_INVALID_COMMAND;
case SPA_NODE_COMMAND_START:
case SPA_NODE_COMMAND_PAUSE:
{
if (!this->have_format)
return SPA_RESULT_NO_FORMAT;
if (this->n_buffers == 0)
return SPA_RESULT_NO_BUFFERS;
return spa_poll_invoke (this->data_loop,
do_command,
++this->seq,
command->size,
command,
this);
}
case SPA_NODE_COMMAND_FLUSH:
case SPA_NODE_COMMAND_DRAIN:
case SPA_NODE_COMMAND_MARKER:
case SPA_NODE_COMMAND_CLOCK_UPDATE:
return SPA_RESULT_NOT_IMPLEMENTED;
}
return SPA_RESULT_OK;
}
static SpaResult
spa_alsa_sink_node_set_event_callback (SpaNode *node,
SpaNodeEventCallback event,
void *user_data)
{
SpaALSASink *this;
if (node == NULL)
return SPA_RESULT_INVALID_ARGUMENTS;
this = SPA_CONTAINER_OF (node, SpaALSASink, node);
this->event_cb = event;
this->user_data = user_data;
return SPA_RESULT_OK;
}
static SpaResult
spa_alsa_sink_node_get_n_ports (SpaNode *node,
unsigned int *n_input_ports,
unsigned int *max_input_ports,
unsigned int *n_output_ports,
unsigned int *max_output_ports)
{
if (node == NULL)
return SPA_RESULT_INVALID_ARGUMENTS;
if (n_input_ports)
*n_input_ports = 1;
if (max_input_ports)
*max_input_ports = 1;
if (n_output_ports)
*n_output_ports = 0;
if (max_output_ports)
*max_output_ports = 0;
return SPA_RESULT_OK;
}
static SpaResult
spa_alsa_sink_node_get_port_ids (SpaNode *node,
unsigned int n_input_ports,
uint32_t *input_ids,
unsigned int n_output_ports,
uint32_t *output_ids)
{
if (node == NULL)
return SPA_RESULT_INVALID_ARGUMENTS;
if (n_input_ports > 0 && input_ids != NULL)
input_ids[0] = 0;
return SPA_RESULT_OK;
}
static SpaResult
spa_alsa_sink_node_add_port (SpaNode *node,
SpaDirection direction,
uint32_t port_id)
{
return SPA_RESULT_NOT_IMPLEMENTED;
}
static SpaResult
spa_alsa_sink_node_remove_port (SpaNode *node,
SpaDirection direction,
uint32_t port_id)
{
return SPA_RESULT_NOT_IMPLEMENTED;
}
static SpaResult
spa_alsa_sink_node_port_enum_formats (SpaNode *node,
SpaDirection direction,
uint32_t port_id,
SpaFormat **format,
const SpaFormat *filter,
void **state)
{
SpaALSASink *this;
int index;
if (node == NULL || format == NULL || state == NULL)
return SPA_RESULT_INVALID_ARGUMENTS;
this = SPA_CONTAINER_OF (node, SpaALSASink, node);
if (!CHECK_PORT (this, direction, port_id))
return SPA_RESULT_INVALID_PORT;
index = (*state == NULL ? 0 : *(int*)state);
switch (index) {
case 0:
spa_format_audio_init (SPA_MEDIA_TYPE_AUDIO,
SPA_MEDIA_SUBTYPE_RAW,
&this->query_format);
break;
case 1:
spa_format_audio_init (SPA_MEDIA_TYPE_AUDIO,
SPA_MEDIA_SUBTYPE_AAC,
&this->query_format);
break;
default:
return SPA_RESULT_ENUM_END;
}
*format = &this->query_format.format;
*(int*)state = ++index;
return SPA_RESULT_OK;
}
static SpaResult
spa_alsa_clear_buffers (SpaALSASink *this)
{
if (this->n_buffers > 0) {
SPA_QUEUE_INIT (&this->ready);
this->n_buffers = 0;
}
return SPA_RESULT_OK;
}
static SpaResult
spa_alsa_sink_node_port_set_format (SpaNode *node,
SpaDirection direction,
uint32_t port_id,
SpaPortFormatFlags flags,
const SpaFormat *format)
{
SpaALSASink *this;
SpaResult res;
if (node == NULL)
return SPA_RESULT_INVALID_ARGUMENTS;
this = SPA_CONTAINER_OF (node, SpaALSASink, node);
if (!CHECK_PORT (this, direction, port_id))
return SPA_RESULT_INVALID_PORT;
if (format == NULL) {
spa_log_info (this->log, "clear format\n");
spa_alsa_pause (this, false);
spa_alsa_clear_buffers (this);
spa_alsa_close (this);
this->have_format = false;
update_state (this, SPA_NODE_STATE_CONFIGURE);
return SPA_RESULT_OK;
}
if ((res = spa_format_audio_parse (format, &this->current_format)) < 0)
return res;
if (spa_alsa_set_format (this, &this->current_format, flags) < 0)
return SPA_RESULT_ERROR;
this->info.flags = SPA_PORT_INFO_FLAG_CAN_USE_BUFFERS |
SPA_PORT_INFO_FLAG_LIVE;
this->info.maxbuffering = this->buffer_frames * this->frame_size;
this->info.latency = (this->period_frames * SPA_NSEC_PER_SEC) / this->rate;
this->info.n_params = 2;
this->info.params = this->params;
this->params[0] = &this->param_buffers.param;
this->param_buffers.param.type = SPA_ALLOC_PARAM_TYPE_BUFFERS;
this->param_buffers.param.size = sizeof (this->param_buffers);
this->param_buffers.minsize = this->period_frames * this->frame_size;
this->param_buffers.stride = 0;
this->param_buffers.min_buffers = 1;
this->param_buffers.max_buffers = 32;
this->param_buffers.align = 16;
this->params[1] = &this->param_meta.param;
this->param_meta.param.type = SPA_ALLOC_PARAM_TYPE_META_ENABLE;
this->param_meta.param.size = sizeof (this->param_meta);
this->param_meta.type = SPA_META_TYPE_HEADER;
this->info.extra = NULL;
this->have_format = true;
update_state (this, SPA_NODE_STATE_READY);
return SPA_RESULT_OK;
}
static SpaResult
spa_alsa_sink_node_port_get_format (SpaNode *node,
SpaDirection direction,
uint32_t port_id,
const SpaFormat **format)
{
SpaALSASink *this;
if (node == NULL || format == NULL)
return SPA_RESULT_INVALID_ARGUMENTS;
this = SPA_CONTAINER_OF (node, SpaALSASink, node);
if (!CHECK_PORT (this, direction, port_id))
return SPA_RESULT_INVALID_PORT;
if (!this->have_format)
return SPA_RESULT_NO_FORMAT;
*format = &this->current_format.format;
return SPA_RESULT_OK;
}
static SpaResult
spa_alsa_sink_node_port_get_info (SpaNode *node,
SpaDirection direction,
uint32_t port_id,
const SpaPortInfo **info)
{
SpaALSASink *this;
if (node == NULL || info == NULL)
return SPA_RESULT_INVALID_ARGUMENTS;
this = SPA_CONTAINER_OF (node, SpaALSASink, node);
if (!CHECK_PORT (this, direction, port_id))
return SPA_RESULT_INVALID_PORT;
*info = &this->info;
return SPA_RESULT_OK;
}
static SpaResult
spa_alsa_sink_node_port_get_props (SpaNode *node,
SpaDirection direction,
uint32_t port_id,
SpaProps **props)
{
return SPA_RESULT_NOT_IMPLEMENTED;
}
static SpaResult
spa_alsa_sink_node_port_set_props (SpaNode *node,
SpaDirection direction,
uint32_t port_id,
const SpaProps *props)
{
return SPA_RESULT_NOT_IMPLEMENTED;
}
static SpaResult
spa_alsa_sink_node_port_use_buffers (SpaNode *node,
SpaDirection direction,
uint32_t port_id,
SpaBuffer **buffers,
uint32_t n_buffers)
{
SpaALSASink *this;
int i;
if (node == NULL)
return SPA_RESULT_INVALID_ARGUMENTS;
if (!CHECK_PORT (this, direction, port_id))
return SPA_RESULT_INVALID_PORT;
this = SPA_CONTAINER_OF (node, SpaALSASink, node);
spa_log_info (this->log, "use buffers %d\n", n_buffers);
if (!this->have_format)
return SPA_RESULT_NO_FORMAT;
if (n_buffers == 0) {
spa_alsa_pause (this, false);
spa_alsa_clear_buffers (this);
update_state (this, SPA_NODE_STATE_READY);
return SPA_RESULT_OK;
}
for (i = 0; i < n_buffers; i++) {
SpaALSABuffer *b = &this->buffers[i];
b->outbuf = buffers[i];
b->outstanding = true;
b->h = spa_buffer_find_meta (b->outbuf, SPA_META_TYPE_HEADER);
switch (buffers[i]->datas[0].type) {
case SPA_DATA_TYPE_MEMFD:
case SPA_DATA_TYPE_DMABUF:
case SPA_DATA_TYPE_MEMPTR:
if (buffers[i]->datas[0].data == NULL) {
spa_log_error (this->log, "alsa-source: need mapped memory\n");
continue;
}
break;
default:
break;
}
}
this->n_buffers = n_buffers;
update_state (this, SPA_NODE_STATE_PAUSED);
return SPA_RESULT_OK;
}
static SpaResult
spa_alsa_sink_node_port_alloc_buffers (SpaNode *node,
SpaDirection direction,
uint32_t port_id,
SpaAllocParam **params,
uint32_t n_params,
SpaBuffer **buffers,
uint32_t *n_buffers)
{
SpaALSASink *this;
if (node == NULL || buffers == NULL)
return SPA_RESULT_INVALID_ARGUMENTS;
if (!CHECK_PORT (this, direction, port_id))
return SPA_RESULT_INVALID_PORT;
this = SPA_CONTAINER_OF (node, SpaALSASink, node);
if (!this->have_format)
return SPA_RESULT_NO_FORMAT;
return SPA_RESULT_NOT_IMPLEMENTED;
}
static SpaResult
spa_alsa_sink_node_port_get_status (SpaNode *node,
SpaDirection direction,
uint32_t port_id,
const SpaPortStatus **status)
{
SpaALSASink *this;
if (node == NULL || status == NULL)
return SPA_RESULT_INVALID_ARGUMENTS;
this = SPA_CONTAINER_OF (node, SpaALSASink, node);
if (!CHECK_PORT (this, direction, port_id))
return SPA_RESULT_INVALID_PORT;
*status = &this->status;
return SPA_RESULT_OK;
}
static SpaResult
spa_alsa_sink_node_port_push_input (SpaNode *node,
unsigned int n_info,
SpaPortInputInfo *info)
{
SpaALSASink *this;
unsigned int i;
bool have_error = false;
if (node == NULL || n_info == 0 || info == NULL)
return SPA_RESULT_INVALID_ARGUMENTS;
this = SPA_CONTAINER_OF (node, SpaALSASink, node);
for (i = 0; i < n_info; i++) {
SpaALSABuffer *b;
if (info[i].port_id != 0) {
info[i].status = SPA_RESULT_INVALID_PORT;
have_error = true;
continue;
}
if (!this->have_format) {
info[i].status = SPA_RESULT_NO_FORMAT;
have_error = true;
continue;
}
if (info[i].buffer_id >= this->n_buffers) {
info[i].status = SPA_RESULT_INVALID_BUFFER_ID;
have_error = true;
continue;
}
b = &this->buffers[info[i].buffer_id];
if (!b->outstanding) {
info[i].status = SPA_RESULT_INVALID_BUFFER_ID;
have_error = true;
continue;
}
b->outstanding = false;
b->next = NULL;
SPA_QUEUE_PUSH_TAIL (&this->ready, SpaALSABuffer, next, b);
info[i].status = SPA_RESULT_OK;
}
if (have_error)
return SPA_RESULT_ERROR;
return SPA_RESULT_OK;
}
static SpaResult
spa_alsa_sink_node_port_pull_output (SpaNode *node,
unsigned int n_info,
SpaPortOutputInfo *info)
{
return SPA_RESULT_INVALID_PORT;
}
static SpaResult
spa_alsa_sink_node_port_reuse_buffer (SpaNode *node,
uint32_t port_id,
uint32_t buffer_id)
{
return SPA_RESULT_NOT_IMPLEMENTED;
}
static SpaResult
spa_alsa_sink_node_port_send_command (SpaNode *node,
SpaDirection direction,
uint32_t port_id,
SpaNodeCommand *command)
{
SpaALSASink *this;
SpaResult res;
if (node == NULL)
return SPA_RESULT_INVALID_ARGUMENTS;
this = SPA_CONTAINER_OF (node, SpaALSASink, node);
if (port_id != 0)
return SPA_RESULT_INVALID_PORT;
switch (command->type) {
case SPA_NODE_COMMAND_PAUSE:
{
if (SPA_RESULT_IS_OK (res = spa_alsa_pause (this, false))) {
update_state (this, SPA_NODE_STATE_PAUSED);
}
break;
}
case SPA_NODE_COMMAND_START:
{
if (SPA_RESULT_IS_OK (res = spa_alsa_start (this, false))) {
update_state (this, SPA_NODE_STATE_STREAMING);
}
break;
}
default:
res = SPA_RESULT_NOT_IMPLEMENTED;
break;
}
return res;
}
static const SpaNode alsasink_node = {
sizeof (SpaNode),
NULL,
SPA_NODE_STATE_INIT,
spa_alsa_sink_node_get_props,
spa_alsa_sink_node_set_props,
spa_alsa_sink_node_send_command,
spa_alsa_sink_node_set_event_callback,
spa_alsa_sink_node_get_n_ports,
spa_alsa_sink_node_get_port_ids,
spa_alsa_sink_node_add_port,
spa_alsa_sink_node_remove_port,
spa_alsa_sink_node_port_enum_formats,
spa_alsa_sink_node_port_set_format,
spa_alsa_sink_node_port_get_format,
spa_alsa_sink_node_port_get_info,
spa_alsa_sink_node_port_get_props,
spa_alsa_sink_node_port_set_props,
spa_alsa_sink_node_port_use_buffers,
spa_alsa_sink_node_port_alloc_buffers,
spa_alsa_sink_node_port_get_status,
spa_alsa_sink_node_port_push_input,
spa_alsa_sink_node_port_pull_output,
spa_alsa_sink_node_port_reuse_buffer,
spa_alsa_sink_node_port_send_command,
};
static SpaResult
spa_alsa_sink_get_interface (SpaHandle *handle,
uint32_t interface_id,
void **interface)
{
SpaALSASink *this;
if (handle == NULL || interface == NULL)
return SPA_RESULT_INVALID_ARGUMENTS;
this = (SpaALSASink *) handle;
if (interface_id == this->uri.node)
*interface = &this->node;
else
return SPA_RESULT_UNKNOWN_INTERFACE;
return SPA_RESULT_OK;
}
static SpaResult
alsa_sink_clear (SpaHandle *handle)
{
return SPA_RESULT_OK;
}
static SpaResult
alsa_sink_init (const SpaHandleFactory *factory,
SpaHandle *handle,
const SpaDict *info,
const SpaSupport *support,
unsigned int n_support)
{
SpaALSASink *this;
unsigned int i;
if (factory == NULL || handle == NULL)
return SPA_RESULT_INVALID_ARGUMENTS;
handle->get_interface = spa_alsa_sink_get_interface;
handle->clear = alsa_sink_clear;
this = (SpaALSASink *) handle;
for (i = 0; i < n_support; i++) {
if (strcmp (support[i].uri, SPA_ID_MAP_URI) == 0)
this->map = support[i].data;
else if (strcmp (support[i].uri, SPA_LOG_URI) == 0)
this->log = support[i].data;
else if (strcmp (support[i].uri, SPA_POLL__DataLoop) == 0)
this->data_loop = support[i].data;
else if (strcmp (support[i].uri, SPA_POLL__MainLoop) == 0)
this->main_loop = support[i].data;
}
if (this->map == NULL) {
spa_log_error (this->log, "an id-map is needed");
return SPA_RESULT_ERROR;
}
this->uri.node = spa_id_map_get_id (this->map, SPA_NODE_URI);
this->node = alsasink_node;
this->props[1].props.n_prop_info = PROP_ID_LAST;
this->props[1].props.prop_info = prop_info;
this->stream = SND_PCM_STREAM_PLAYBACK;
reset_alsa_sink_props (&this->props[1]);
this->status.flags = SPA_PORT_STATUS_FLAG_NONE;
for (i = 0; info && i < info->n_items; i++) {
if (!strcmp (info->items[i].key, "alsa.card")) {
snprintf (this->props[1].device, 63, "hw:%s", info->items[i].value);
this->props[1].props.unset_mask &= ~1;
}
}
update_state (this, SPA_NODE_STATE_CONFIGURE);
return SPA_RESULT_OK;
}
static const SpaInterfaceInfo alsa_sink_interfaces[] =
{
{ SPA_NODE_URI, },
};
static SpaResult
alsa_sink_enum_interface_info (const SpaHandleFactory *factory,
const SpaInterfaceInfo **info,
void **state)
{
int index;
if (factory == NULL || info == NULL || state == NULL)
return SPA_RESULT_INVALID_ARGUMENTS;
index = (*state == NULL ? 0 : *(int*)state);
switch (index) {
case 0:
*info = &alsa_sink_interfaces[index];
break;
default:
return SPA_RESULT_ENUM_END;
}
*(int*)state = ++index;
return SPA_RESULT_OK;
}
const SpaHandleFactory spa_alsa_sink_factory =
{ "alsa-sink",
NULL,
sizeof (SpaALSASink),
alsa_sink_init,
alsa_sink_enum_interface_info,
};
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