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mpv/audio/out/ao_pipewire.c

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/*
* PipeWire audio output driver.
* Copyright (C) 2021 Thomas Weißschuh <thomas@t-8ch.de>
* Copyright (C) 2021 Oschowa <oschowa@web.de>
* Copyright (C) 2020 Andreas Kempf <aakempf@gmail.com>
*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* mpv 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <pipewire/pipewire.h>
#include <pipewire/global.h>
#include <spa/param/audio/format-utils.h>
#include <spa/param/props.h>
#include <math.h>
#include "common/msg.h"
#include "options/m_config.h"
#include "options/m_option.h"
#include "ao.h"
#include "audio/format.h"
#include "config.h"
#include "generated/version.h"
#include "internal.h"
#include "osdep/timer.h"
// Added in Pipewire 0.3.33
// remove the fallback when we require a newer version
#ifndef PW_KEY_NODE_RATE
#define PW_KEY_NODE_RATE "node.rate"
#endif
#if !PW_CHECK_VERSION(0, 3, 50)
static inline int pw_stream_get_time_n(struct pw_stream *stream, struct pw_time *time, size_t size) {
return pw_stream_get_time(stream, time);
}
#endif
struct priv {
struct pw_thread_loop *loop;
struct pw_stream *stream;
struct pw_core *core;
struct spa_hook stream_listener;
bool muted;
float volume[2];
struct {
int buffer_msec;
char *remote;
} options;
struct {
struct pw_registry *registry;
struct spa_hook registry_listener;
struct spa_list sinks;
} hotplug;
};
struct id_list {
uint32_t id;
struct spa_list node;
};
static enum spa_audio_format af_fmt_to_pw(struct ao *ao, enum af_format format)
{
switch (format) {
case AF_FORMAT_U8: return SPA_AUDIO_FORMAT_U8;
case AF_FORMAT_S16: return SPA_AUDIO_FORMAT_S16;
case AF_FORMAT_S32: return SPA_AUDIO_FORMAT_S32;
case AF_FORMAT_FLOAT: return SPA_AUDIO_FORMAT_F32;
case AF_FORMAT_DOUBLE: return SPA_AUDIO_FORMAT_F64;
case AF_FORMAT_U8P: return SPA_AUDIO_FORMAT_U8P;
case AF_FORMAT_S16P: return SPA_AUDIO_FORMAT_S16P;
case AF_FORMAT_S32P: return SPA_AUDIO_FORMAT_S32P;
case AF_FORMAT_FLOATP: return SPA_AUDIO_FORMAT_F32P;
case AF_FORMAT_DOUBLEP: return SPA_AUDIO_FORMAT_F64P;
default:
MP_WARN(ao, "Unhandled format %d\n", format);
return SPA_AUDIO_FORMAT_UNKNOWN;
}
}
static enum spa_audio_channel mp_speaker_id_to_spa(struct ao *ao, enum mp_speaker_id mp_speaker_id)
{
switch (mp_speaker_id) {
case MP_SPEAKER_ID_FL: return SPA_AUDIO_CHANNEL_FL;
case MP_SPEAKER_ID_FR: return SPA_AUDIO_CHANNEL_FR;
case MP_SPEAKER_ID_FC: return SPA_AUDIO_CHANNEL_FC;
case MP_SPEAKER_ID_LFE: return SPA_AUDIO_CHANNEL_LFE;
case MP_SPEAKER_ID_BL: return SPA_AUDIO_CHANNEL_RL;
case MP_SPEAKER_ID_BR: return SPA_AUDIO_CHANNEL_RR;
case MP_SPEAKER_ID_FLC: return SPA_AUDIO_CHANNEL_FLC;
case MP_SPEAKER_ID_FRC: return SPA_AUDIO_CHANNEL_FRC;
case MP_SPEAKER_ID_BC: return SPA_AUDIO_CHANNEL_RC;
case MP_SPEAKER_ID_SL: return SPA_AUDIO_CHANNEL_SL;
case MP_SPEAKER_ID_SR: return SPA_AUDIO_CHANNEL_SR;
case MP_SPEAKER_ID_TC: return SPA_AUDIO_CHANNEL_TC;
case MP_SPEAKER_ID_TFL: return SPA_AUDIO_CHANNEL_TFL;
case MP_SPEAKER_ID_TFC: return SPA_AUDIO_CHANNEL_TFC;
case MP_SPEAKER_ID_TFR: return SPA_AUDIO_CHANNEL_TFR;
case MP_SPEAKER_ID_TBL: return SPA_AUDIO_CHANNEL_TRL;
case MP_SPEAKER_ID_TBC: return SPA_AUDIO_CHANNEL_TRC;
case MP_SPEAKER_ID_TBR: return SPA_AUDIO_CHANNEL_TRR;
case MP_SPEAKER_ID_DL: return SPA_AUDIO_CHANNEL_FL;
case MP_SPEAKER_ID_DR: return SPA_AUDIO_CHANNEL_FR;
case MP_SPEAKER_ID_WL: return SPA_AUDIO_CHANNEL_FL;
case MP_SPEAKER_ID_WR: return SPA_AUDIO_CHANNEL_FR;
case MP_SPEAKER_ID_SDL: return SPA_AUDIO_CHANNEL_SL;
case MP_SPEAKER_ID_SDR: return SPA_AUDIO_CHANNEL_SL;
case MP_SPEAKER_ID_LFE2: return SPA_AUDIO_CHANNEL_LFE2;
case MP_SPEAKER_ID_NA: return SPA_AUDIO_CHANNEL_NA;
default:
MP_WARN(ao, "Unhandled channel %d\n", mp_speaker_id);
return SPA_AUDIO_CHANNEL_UNKNOWN;
};
}
static void on_process(void *userdata)
{
struct ao *ao = userdata;
struct priv *p = ao->priv;
struct pw_time time;
struct pw_buffer *b;
void *data[MP_NUM_CHANNELS];
if ((b = pw_stream_dequeue_buffer(p->stream)) == NULL) {
MP_WARN(ao, "out of buffers: %s\n", strerror(errno));
return;
}
struct spa_buffer *buf = b->buffer;
int bytes_per_channel = buf->datas[0].maxsize / ao->channels.num;
int nframes = bytes_per_channel / ao->sstride;
#if PW_CHECK_VERSION(0, 3, 49)
if (b->requested != 0)
nframes = MPMIN(b->requested, nframes);
#endif
for (int i = 0; i < buf->n_datas; i++)
data[i] = buf->datas[i].data;
pw_stream_get_time_n(p->stream, &time, sizeof(time));
if (time.rate.denom == 0)
time.rate.denom = ao->samplerate;
if (time.rate.num == 0)
time.rate.num = 1;
int64_t end_time = mp_time_us();
/* time.queued is always going to be 0, so we don't need to care */
end_time += (nframes * 1e6 / ao->samplerate) +
((float) time.delay * SPA_USEC_PER_SEC * time.rate.num / time.rate.denom);
int samples = ao_read_data(ao, data, nframes, end_time);
b->size = samples;
for (int i = 0; i < buf->n_datas; i++) {
buf->datas[i].chunk->size = samples * ao->sstride;
buf->datas[i].chunk->offset = 0;
buf->datas[i].chunk->stride = ao->sstride;
}
pw_stream_queue_buffer(p->stream, b);
}
static void on_param_changed(void *userdata, uint32_t id, const struct spa_pod *param)
{
struct ao *ao = userdata;
struct priv *p = ao->priv;
const struct spa_pod *params[1];
uint8_t buffer[1024];
struct spa_pod_builder b = SPA_POD_BUILDER_INIT(buffer, sizeof(buffer));
if (param == NULL || id != SPA_PARAM_Format)
return;
int buffer_size = ao->device_buffer * af_fmt_to_bytes(ao->format) * ao->channels.num;
params[0] = spa_pod_builder_add_object(&b,
SPA_TYPE_OBJECT_ParamBuffers, SPA_PARAM_Buffers,
SPA_PARAM_BUFFERS_blocks, SPA_POD_Int(ao->num_planes),
SPA_PARAM_BUFFERS_size, SPA_POD_Int(buffer_size),
SPA_PARAM_BUFFERS_stride, SPA_POD_Int(ao->sstride));
if (!params[0]) {
MP_ERR(ao, "Could not build parameter pod\n");
return;
}
if (pw_stream_update_params(p->stream, params, 1) < 0) {
MP_ERR(ao, "Could not update stream parameters\n");
return;
}
}
static void on_state_changed(void *userdata, enum pw_stream_state old, enum pw_stream_state state, const char *error)
{
struct ao *ao = userdata;
MP_DBG(ao, "Stream state changed: old_state=%d state=%d error=%s\n", old, state, error);
if (state == PW_STREAM_STATE_ERROR) {
MP_WARN(ao, "Stream in error state, trying to reload...\n");
ao_request_reload(ao);
}
}
static float spa_volume_to_mp_volume(float vol)
{
return vol * 100;
}
static float mp_volume_to_spa_volume(float vol)
{
return vol / 100;
}
static float volume_avg(float* vols, uint32_t n)
{
float sum = 0.0;
for (int i = 0; i < n; i++)
sum += vols[i];
return sum / n;
}
static void on_control_info(void *userdata, uint32_t id,
const struct pw_stream_control *control)
{
struct ao *ao = userdata;
struct priv *p = ao->priv;
switch (id) {
case SPA_PROP_mute:
if (control->n_values == 1)
p->muted = control->values[0] >= 0.5;
break;
case SPA_PROP_channelVolumes:
if (control->n_values == 2) {
p->volume[0] = control->values[0];
p->volume[1] = control->values[1];
} else if (control->n_values > 0) {
float volume = volume_avg(control->values, control->n_values);
p->volume[0] = volume;
p->volume[1] = volume;
}
break;
}
}
static const struct pw_stream_events stream_events = {
.version = PW_VERSION_STREAM_EVENTS,
.param_changed = on_param_changed,
.process = on_process,
.state_changed = on_state_changed,
.control_info = on_control_info,
};
static void uninit(struct ao *ao)
{
struct priv *p = ao->priv;
if (p->loop)
pw_thread_loop_stop(p->loop);
if (p->stream)
pw_stream_destroy(p->stream);
p->stream = NULL;
if (p->core) {
pw_context_destroy(pw_core_get_context(p->core));
}
p->core = NULL;
if (p->loop)
pw_thread_loop_destroy(p->loop);
p->loop = NULL;
pw_deinit();
}
struct registry_event_global_ctx {
struct ao *ao;
void (*sink_cb) (struct ao *ao, uint32_t id, const struct spa_dict *props, void *sink_cb_ctx);
void *sink_cb_ctx;
};
static bool is_sink_node(const char *type, const struct spa_dict *props)
{
if (strcmp(type, PW_TYPE_INTERFACE_Node) != 0)
return false;
if (!props)
return false;
const char *class = spa_dict_lookup(props, PW_KEY_MEDIA_CLASS);
if (!class || strcmp(class, "Audio/Sink") != 0)
return false;
return true;
}
static void for_each_sink_registry_event_global(void *data, uint32_t id,
uint32_t permissions, const
char *type, uint32_t version,
const struct spa_dict *props)
{
struct registry_event_global_ctx *ctx = data;
if (!is_sink_node(type, props))
return;
ctx->sink_cb(ctx->ao, id, props, ctx->sink_cb_ctx);
}
static const struct pw_registry_events for_each_sink_registry_events = {
.version = PW_VERSION_REGISTRY_EVENTS,
.global = for_each_sink_registry_event_global,
};
static void for_each_sink_done(void *data, uint32_t it, int seq)
{
struct pw_thread_loop *loop = data;
pw_thread_loop_signal(loop, false);
}
static const struct pw_core_events for_each_sink_core_events = {
.version = PW_VERSION_CORE_EVENTS,
.done = for_each_sink_done,
};
static int for_each_sink(struct ao *ao, void (cb) (struct ao *ao, uint32_t id,
const struct spa_dict *props, void *ctx), void *cb_ctx)
{
struct priv *priv = ao->priv;
struct pw_registry *registry;
struct spa_hook core_listener;
int ret = -1;
pw_thread_loop_lock(priv->loop);
spa_zero(core_listener);
if (pw_core_add_listener(priv->core, &core_listener, &for_each_sink_core_events, priv->loop) < 0)
goto unlock_loop;
registry = pw_core_get_registry(priv->core, PW_VERSION_REGISTRY, 0);
if (!registry)
goto remove_core_listener;
pw_core_sync(priv->core, 0, 0);
struct spa_hook registry_listener;
struct registry_event_global_ctx revents_ctx = {
.ao = ao,
.sink_cb = cb,
.sink_cb_ctx = cb_ctx,
};
spa_zero(registry_listener);
if (pw_registry_add_listener(registry, &registry_listener, &for_each_sink_registry_events, &revents_ctx) < 0)
goto destroy_registry;
pw_thread_loop_wait(priv->loop);
spa_hook_remove(&registry_listener);
ret = 0;
destroy_registry:
pw_proxy_destroy((struct pw_proxy *)registry);
remove_core_listener:
spa_hook_remove(&core_listener);
unlock_loop:
pw_thread_loop_unlock(priv->loop);
return ret;
}
static int pipewire_init_boilerplate(struct ao *ao)
{
struct priv *p = ao->priv;
struct pw_context *context;
int ret;
pw_init(NULL, NULL);
p->loop = pw_thread_loop_new("ao-pipewire", NULL);
if (p->loop == NULL)
return -1;
pw_thread_loop_lock(p->loop);
if (pw_thread_loop_start(p->loop) < 0)
goto error;
context = pw_context_new(pw_thread_loop_get_loop(p->loop), NULL, 0);
if (!context)
goto error;
p->core = pw_context_connect(
context,
pw_properties_new(PW_KEY_REMOTE_NAME, p->options.remote, NULL),
0);
if (!p->core) {
MP_WARN(ao, "Could not connect to context '%s': %s\n",
p->options.remote, strerror(errno));
goto error;
}
ret = 0;
out:
pw_thread_loop_unlock(p->loop);
return ret;
error:
ret = -1;
goto out;
}
static int init(struct ao *ao)
{
struct priv *p = ao->priv;
uint8_t buffer[1024];
struct spa_pod_builder b = SPA_POD_BUILDER_INIT(buffer, sizeof(buffer));
const struct spa_pod *params[1];
struct pw_properties *props = pw_properties_new(
PW_KEY_MEDIA_TYPE, "Audio",
PW_KEY_MEDIA_CATEGORY, "Playback",
PW_KEY_NODE_NAME, ao->client_name,
PW_KEY_NODE_DESCRIPTION, ao->client_name,
PW_KEY_APP_NAME, ao->client_name,
PW_KEY_APP_ID, ao->client_name,
PW_KEY_APP_ICON_NAME, ao->client_name,
PW_KEY_NODE_ALWAYS_PROCESS, "true",
PW_KEY_TARGET_OBJECT, ao->device,
NULL
);
if (pipewire_init_boilerplate(ao) < 0)
goto error;
ao->device_buffer = p->options.buffer_msec * ao->samplerate / 1000;
pw_properties_setf(props, PW_KEY_NODE_LATENCY, "%d/%d", ao->device_buffer, ao->samplerate);
pw_properties_setf(props, PW_KEY_NODE_RATE, "1/%d", ao->samplerate);
enum spa_audio_format spa_format = af_fmt_to_pw(ao, ao->format);
if (spa_format == SPA_AUDIO_FORMAT_UNKNOWN) {
ao->format = AF_FORMAT_FLOATP;
spa_format = SPA_AUDIO_FORMAT_F32P;
}
struct spa_audio_info_raw audio_info = {
.format = spa_format,
.rate = ao->samplerate,
.channels = ao->channels.num,
};
for (int i = 0; i < ao->channels.num; i++)
audio_info.position[i] = mp_speaker_id_to_spa(ao, ao->channels.speaker[i]);
params[0] = spa_format_audio_raw_build(&b, SPA_PARAM_EnumFormat, &audio_info);
if (!params[0])
goto error;
if (af_fmt_is_planar(ao->format)) {
ao->num_planes = ao->channels.num;
ao->sstride = af_fmt_to_bytes(ao->format);
} else {
ao->num_planes = 1;
ao->sstride = ao->channels.num * af_fmt_to_bytes(ao->format);
}
pw_thread_loop_lock(p->loop);
p->stream = pw_stream_new(
p->core,
"audio-src",
props);
if (p->stream == NULL) {
pw_thread_loop_unlock(p->loop);
goto error;
}
pw_stream_add_listener(p->stream,
&p->stream_listener,
&stream_events, ao);
if (pw_stream_connect(p->stream,
PW_DIRECTION_OUTPUT, PW_ID_ANY,
PW_STREAM_FLAG_AUTOCONNECT |
PW_STREAM_FLAG_INACTIVE |
PW_STREAM_FLAG_MAP_BUFFERS |
PW_STREAM_FLAG_RT_PROCESS,
params, 1) < 0) {
pw_thread_loop_unlock(p->loop);
goto error;
}
pw_thread_loop_unlock(p->loop);
return 0;
error:
uninit(ao);
return -1;
}
static void reset(struct ao *ao)
{
struct priv *p = ao->priv;
pw_thread_loop_lock(p->loop);
pw_stream_set_active(p->stream, false);
pw_stream_flush(p->stream, false);
pw_thread_loop_unlock(p->loop);
}
static void start(struct ao *ao)
{
struct priv *p = ao->priv;
pw_thread_loop_lock(p->loop);
pw_stream_set_active(p->stream, true);
pw_thread_loop_unlock(p->loop);
}
#define CONTROL_RET(r) (!r ? CONTROL_OK : CONTROL_ERROR)
static int control(struct ao *ao, enum aocontrol cmd, void *arg)
{
struct priv *p = ao->priv;
switch (cmd) {
case AOCONTROL_GET_VOLUME: {
struct ao_control_vol *vol = arg;
vol->left = spa_volume_to_mp_volume(p->volume[0]);
vol->right = spa_volume_to_mp_volume(p->volume[1]);
return CONTROL_OK;
}
case AOCONTROL_GET_MUTE: {
bool *muted = arg;
*muted = p->muted;
return CONTROL_OK;
}
case AOCONTROL_SET_VOLUME:
case AOCONTROL_SET_MUTE:
case AOCONTROL_UPDATE_STREAM_TITLE:
case AOCONTROL_UPDATE_MEDIA_ROLE: {
int ret;
pw_thread_loop_lock(p->loop);
switch (cmd) {
case AOCONTROL_SET_VOLUME: {
struct ao_control_vol *vol = arg;
uint8_t n = ao->channels.num;
float values[MP_NUM_CHANNELS] = {0};
if (n == 2) {
values[0] = mp_volume_to_spa_volume(vol->left);
values[1] = mp_volume_to_spa_volume(vol->right);
} else {
for (int i = 0; i < n; i++)
values[i] = mp_volume_to_spa_volume(vol->left);
}
ret = CONTROL_RET(pw_stream_set_control(p->stream, SPA_PROP_channelVolumes, n, values, 0));
break;
}
case AOCONTROL_SET_MUTE: {
bool *muted = arg;
float value = *muted ? 1.f : 0.f;
ret = CONTROL_RET(pw_stream_set_control(p->stream, SPA_PROP_mute, 1, &value, 0));
break;
}
case AOCONTROL_UPDATE_STREAM_TITLE: {
char *title = arg;
struct spa_dict_item items[1];
items[0] = SPA_DICT_ITEM_INIT(PW_KEY_MEDIA_NAME, title);
ret = CONTROL_RET(pw_stream_update_properties(p->stream, &SPA_DICT_INIT(items, MP_ARRAY_SIZE(items))));
break;
}
case AOCONTROL_UPDATE_MEDIA_ROLE: {
enum aocontrol_media_role *role = arg;
struct spa_dict_item items[1];
const char *role_str;
switch (*role) {
case AOCONTROL_MEDIA_ROLE_MOVIE:
role_str = "Movie";
break;
case AOCONTROL_MEDIA_ROLE_MUSIC:
role_str = "Music";
break;
default:
MP_WARN(ao, "Unknown media role %d\n", *role);
role_str = "";
break;
}
items[0] = SPA_DICT_ITEM_INIT(PW_KEY_MEDIA_ROLE, role_str);
ret = CONTROL_RET(pw_stream_update_properties(p->stream, &SPA_DICT_INIT(items, MP_ARRAY_SIZE(items))));
break;
}
default:
ret = CONTROL_NA;
}
pw_thread_loop_unlock(p->loop);
return ret;
}
default:
return CONTROL_UNKNOWN;
}
}
static void add_device_to_list(struct ao *ao, uint32_t id, const struct spa_dict *props, void *ctx)
{
struct ao_device_list *list = ctx;
const char *name = spa_dict_lookup(props, PW_KEY_NODE_NAME);
if (!name)
return;
const char *description = spa_dict_lookup(props, PW_KEY_NODE_DESCRIPTION);
ao_device_list_add(list, ao, &(struct ao_device_desc){name, description});
}
static void hotplug_registry_global_cb(void *data, uint32_t id,
uint32_t permissions, const char *type,
uint32_t version, const struct spa_dict *props)
{
struct ao *ao = data;
struct priv *priv = ao->priv;
if (!is_sink_node(type, props))
return;
pw_thread_loop_lock(priv->loop);
struct id_list *item = talloc_size(ao, sizeof(*item));
item->id = id;
spa_list_init(&item->node);
spa_list_append(&priv->hotplug.sinks, &item->node);
pw_thread_loop_unlock(priv->loop);
ao_hotplug_event(ao);
}
static void hotplug_registry_global_remove_cb(void *data, uint32_t id)
{
struct ao *ao = data;
struct priv *priv = ao->priv;
bool removed_sink = false;
struct id_list *e;
pw_thread_loop_lock(priv->loop);
spa_list_for_each(e, &priv->hotplug.sinks, node) {
if (e->id == id) {
removed_sink = true;
spa_list_remove(&e->node);
talloc_free(e);
goto done;
}
}
done:
pw_thread_loop_unlock(priv->loop);
if (removed_sink)
ao_hotplug_event(ao);
}
static const struct pw_registry_events hotplug_registry_events = {
.version = PW_VERSION_REGISTRY_EVENTS,
.global = hotplug_registry_global_cb,
.global_remove = hotplug_registry_global_remove_cb,
};
static int hotplug_init(struct ao *ao)
{
struct priv *priv = ao->priv;
int res = pipewire_init_boilerplate(ao);
if (res)
return res;
pw_thread_loop_lock(priv->loop);
spa_memzero(&priv->hotplug, sizeof(priv->hotplug));
spa_list_init(&priv->hotplug.sinks);
priv->hotplug.registry = pw_core_get_registry(priv->core, PW_VERSION_REGISTRY, 0);
if (!priv->hotplug.registry) {
goto error;
}
if (pw_registry_add_listener(priv->hotplug.registry, &priv->hotplug.registry_listener, &hotplug_registry_events, ao) < 0) {
pw_proxy_destroy((struct pw_proxy *)priv->hotplug.registry);
goto error;
}
pw_thread_loop_unlock(priv->loop);
return res;
error:
pw_thread_loop_unlock(priv->loop);
uninit(ao);
return -1;
}
static void hotplug_uninit(struct ao *ao)
{
struct priv *priv = ao->priv;
pw_thread_loop_lock(priv->loop);
spa_hook_remove(&priv->hotplug.registry_listener);
pw_proxy_destroy((struct pw_proxy *)priv->hotplug.registry);
pw_thread_loop_unlock(priv->loop);
uninit(ao);
}
static void list_devs(struct ao *ao, struct ao_device_list *list)
{
ao_device_list_add(list, ao, &(struct ao_device_desc){});
if (for_each_sink(ao, add_device_to_list, list) < 0)
MP_WARN(ao, "Could not list devices, list may be incomplete\n");
}
#define OPT_BASE_STRUCT struct priv
const struct ao_driver audio_out_pipewire = {
.description = "PipeWire audio output",
.name = "pipewire",
.init = init,
.uninit = uninit,
.reset = reset,
.start = start,
.control = control,
.hotplug_init = hotplug_init,
.hotplug_uninit = hotplug_uninit,
.list_devs = list_devs,
.priv_size = sizeof(struct priv),
.priv_defaults = &(const struct priv)
{
.loop = NULL,
.stream = NULL,
.options.buffer_msec = 20,
},
.options_prefix = "pipewire",
.options = (const struct m_option[]) {
{"buffer", OPT_INT(options.buffer_msec), M_RANGE(1, 2000)},
{"remote", OPT_STRING(options.remote) },
{0}
},
};
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