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That's all there is to it!

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# pipewire-alsa
ALSA plugin for pipewire

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pipewire_alsa_plugin_sources = [
'pcm_pipewire.c',
]
pipewire_alsa_plugin_c_args = [
'-DHAVE_CONFIG_H',
'-DPIC',
]
pipewire_alsa_plugin = shared_library('asound_module_pcm_pipewire',
pipewire_alsa_plugin_sources,
c_args : pipewire_alsa_plugin_c_args,
include_directories : [configinc],
dependencies : [pipewire_dep, alsa_dep],
install : true,
install_dir : join_paths(pipewire_libdir, 'alsa-lib'),
)

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/*
* PCM - PipeWire plugin
*
* Copyright (c) 2017 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 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.
*
* This program 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#define __USE_GNU
#define _GNU_SOURCE
#include <limits.h>
#include <byteswap.h>
#include <sys/shm.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/eventfd.h>
#include <sys/mman.h>
#include <alsa/asoundlib.h>
#include <alsa/pcm_external.h>
#include <spa/param/audio/format-utils.h>
#include <spa/param/props.h>
#include <spa/utils/result.h>
#include <pipewire/pipewire.h>
#define MIN_BUFFERS 3u
#define MAX_BUFFERS 64u
#define MAX_CHANNELS 32
#define MAX_RATE (48000*8)
#define MIN_PERIOD 64
typedef struct {
snd_pcm_ioplug_t io;
char *node_name;
uint32_t target;
int fd;
bool activated; /* PipeWire is activated? */
bool error;
unsigned int num_ports;
unsigned int hw_ptr;
unsigned int sample_bits;
snd_pcm_uframes_t min_avail;
struct pw_loop *loop;
struct pw_thread_loop *main_loop;
struct pw_core *core;
struct pw_remote *remote;
struct spa_hook remote_listener;
uint32_t flags;
struct pw_stream *stream;
struct spa_hook stream_listener;
struct spa_audio_info_raw format;
} snd_pcm_pipewire_t;
static int snd_pcm_pipewire_stop(snd_pcm_ioplug_t *io);
static int pcm_poll_block_check(snd_pcm_ioplug_t *io)
{
uint64_t val;
snd_pcm_sframes_t avail;
snd_pcm_pipewire_t *pw = io->private_data;
if (io->state == SND_PCM_STATE_RUNNING ||
(io->state == SND_PCM_STATE_PREPARED && io->stream == SND_PCM_STREAM_CAPTURE)) {
avail = snd_pcm_avail_update(io->pcm);
if (avail >= 0 && avail < (snd_pcm_sframes_t)pw->min_avail) {
read(io->poll_fd, &val, sizeof(val));
return 1;
}
}
return 0;
}
static inline int pcm_poll_unblock_check(snd_pcm_ioplug_t *io)
{
uint64_t val = 1;
snd_pcm_pipewire_t *pw = io->private_data;
write(pw->fd, &val, sizeof(val));
return 1;
}
static void snd_pcm_pipewire_free(snd_pcm_pipewire_t *pw)
{
if (pw) {
if (pw->main_loop)
pw_thread_loop_stop(pw->main_loop);
if (pw->core)
pw_core_destroy(pw->core);
if (pw->main_loop)
pw_thread_loop_destroy(pw->main_loop);
if (pw->loop)
pw_loop_destroy(pw->loop);
if (pw->fd >= 0)
close(pw->fd);
free(pw);
}
}
static int snd_pcm_pipewire_close(snd_pcm_ioplug_t *io)
{
snd_pcm_pipewire_t *pw = io->private_data;
snd_pcm_pipewire_free(pw);
return 0;
}
static int snd_pcm_pipewire_poll_revents(snd_pcm_ioplug_t *io,
struct pollfd *pfds, unsigned int nfds,
unsigned short *revents)
{
snd_pcm_pipewire_t *pw = io->private_data;
assert(pfds && nfds == 1 && revents);
if (pw->error)
return -EBADFD;
*revents = pfds[0].revents & ~(POLLIN | POLLOUT);
if (pfds[0].revents & POLLIN && !pcm_poll_block_check(io))
*revents |= (io->stream == SND_PCM_STREAM_PLAYBACK) ? POLLOUT : POLLIN;
return 0;
}
static snd_pcm_sframes_t snd_pcm_pipewire_pointer(snd_pcm_ioplug_t *io)
{
snd_pcm_pipewire_t *pw = io->private_data;
if (pw->error)
return -EBADFD;
return pw->hw_ptr;
}
static int
snd_pcm_pipewire_process_playback(snd_pcm_pipewire_t *pw, struct pw_buffer *b)
{
snd_pcm_ioplug_t *io = &pw->io;
const snd_pcm_channel_area_t *areas;
snd_pcm_channel_area_t *pwareas;
snd_pcm_uframes_t xfer = 0;
unsigned int channel, bps, bpf;
snd_pcm_uframes_t nframes;
uint32_t offset, index = 0, nbytes, avail, maxsize;
int32_t filled;
void *ptr;
struct spa_data *d;
bps = io->channels * pw->sample_bits;
bpf = bps / 8;
pwareas = alloca(io->channels * sizeof(snd_pcm_channel_area_t));
d = b->buffer->datas;
maxsize = d[0].maxsize;
filled = 0;
index = 0;
avail = maxsize - filled;
avail = SPA_MIN(avail, pw->min_avail * bpf);
do {
offset = index % maxsize;
nbytes = SPA_MIN(avail, maxsize - offset);
ptr = SPA_MEMBER(d[0].data, offset, void);
nframes = nbytes / bpf;
pw_log_trace("%d %d %lu %d %d %p %d", nbytes, avail, nframes, filled, offset, ptr, io->state);
for (channel = 0; channel < io->channels; channel++) {
pwareas[channel].addr = ptr;
pwareas[channel].first = channel * pw->sample_bits;
pwareas[channel].step = bps;
}
if (io->state != SND_PCM_STATE_RUNNING && io->state != SND_PCM_STATE_DRAINING) {
pw_log_trace("silence %lu frames %d", nframes, io->state);
for (channel = 0; channel < io->channels; channel++)
snd_pcm_area_silence(&pwareas[channel], 0, nframes, io->format);
goto done;
}
areas = snd_pcm_ioplug_mmap_areas(io);
xfer = 0;
while (xfer < nframes) {
snd_pcm_uframes_t frames = nframes - xfer;
snd_pcm_uframes_t offset = pw->hw_ptr;
snd_pcm_uframes_t cont = io->buffer_size - offset;
if (cont < frames)
frames = cont;
snd_pcm_areas_copy(pwareas, xfer,
areas, offset,
io->channels, frames, io->format);
pw->hw_ptr += frames;
pw->hw_ptr %= io->buffer_size;
xfer += frames;
}
pcm_poll_unblock_check(io); /* unblock socket for polling if needed */
done:
index += nbytes;
avail -= nbytes;
} while (avail > 0);
d[0].chunk->offset = 0;
d[0].chunk->size = index;
d[0].chunk->stride = 0;
return 0;
}
static int
snd_pcm_pipewire_process_record(snd_pcm_pipewire_t *pw, struct pw_buffer *b)
{
snd_pcm_ioplug_t *io = &pw->io;
const snd_pcm_channel_area_t *areas;
snd_pcm_channel_area_t *pwareas;
snd_pcm_uframes_t xfer = 0;
unsigned int channel, bps, bpf;
snd_pcm_uframes_t nframes;
uint32_t offset, index = 0, nbytes, avail, maxsize;
struct spa_data *d;
void *ptr;
bps = io->channels * pw->sample_bits;
bpf = bps / 8;
pwareas = alloca(io->channels * sizeof(snd_pcm_channel_area_t));
d = b->buffer->datas;
maxsize = d[0].chunk->size;
avail = maxsize;
index = d[0].chunk->offset;
do {
avail = SPA_MIN(avail, pw->min_avail * bpf);
offset = index % maxsize;
nbytes = SPA_MIN(avail, maxsize - offset);
ptr = SPA_MEMBER(d[0].data, offset, void);
pw_log_trace("%d %d %d %p", nbytes, avail, offset, ptr);
nframes = nbytes / bpf;
for (channel = 0; channel < io->channels; channel++) {
pwareas[channel].addr = ptr;
pwareas[channel].first = channel * pw->sample_bits;
pwareas[channel].step = bps;
}
areas = snd_pcm_ioplug_mmap_areas(io);
xfer = 0;
while (xfer < nframes) {
snd_pcm_uframes_t frames = nframes - xfer;
snd_pcm_uframes_t offset = pw->hw_ptr;
snd_pcm_uframes_t cont = io->buffer_size - offset;
if (cont < frames)
frames = cont;
snd_pcm_areas_copy(areas, offset,
pwareas, xfer,
io->channels, frames, io->format);
pw->hw_ptr += frames;
pw->hw_ptr %= io->buffer_size;
xfer += frames;
}
pcm_poll_unblock_check(io); /* unblock socket for polling if needed */
avail -= nbytes;
index += nbytes;
} while (avail > 0);
return 0;
}
static void on_stream_format_changed(void *data, const struct spa_pod *format)
{
snd_pcm_pipewire_t *pw = data;
snd_pcm_ioplug_t *io = &pw->io;
const struct spa_pod *params[4];
uint32_t n_params = 0;
uint8_t buffer[4096];
struct spa_pod_builder b = SPA_POD_BUILDER_INIT(buffer, sizeof(buffer));
uint32_t stride = (io->channels * pw->sample_bits) / 8;
uint32_t buffers;
uint32_t size;
io->period_size = pw->min_avail;
buffers = SPA_CLAMP(io->buffer_size / io->period_size, MIN_BUFFERS, MAX_BUFFERS);
size = io->period_size * stride;
pw_log_info("buffer_size:%lu period_size:%lu buffers:%u stride:%u size:%u min_avail:%lu",
io->buffer_size, io->period_size, buffers, stride, size, pw->min_avail);
params[n_params++] = spa_pod_builder_add_object(&b,
SPA_TYPE_OBJECT_ParamBuffers, SPA_PARAM_Buffers,
SPA_PARAM_BUFFERS_buffers, SPA_POD_CHOICE_RANGE_Int(buffers, MIN_BUFFERS, MAX_BUFFERS),
SPA_PARAM_BUFFERS_blocks, SPA_POD_Int(1),
SPA_PARAM_BUFFERS_size, SPA_POD_CHOICE_RANGE_Int(size, size, INT_MAX),
SPA_PARAM_BUFFERS_stride, SPA_POD_Int(stride),
SPA_PARAM_BUFFERS_align, SPA_POD_Int(16));
pw_stream_finish_format(pw->stream, 0, params, n_params);
}
static void on_stream_process(void *data)
{
snd_pcm_pipewire_t *pw = data;
snd_pcm_ioplug_t *io = &pw->io;
struct pw_buffer *b;
b = pw_stream_dequeue_buffer(pw->stream);
if (b == NULL)
return;
if (io->stream == SND_PCM_STREAM_PLAYBACK)
snd_pcm_pipewire_process_playback(pw, b);
else
snd_pcm_pipewire_process_record(pw, b);
pw_stream_queue_buffer(pw->stream, b);
}
static const struct pw_stream_events stream_events = {
PW_VERSION_STREAM_EVENTS,
.format_changed = on_stream_format_changed,
.process = on_stream_process,
};
static int snd_pcm_pipewire_prepare(snd_pcm_ioplug_t *io)
{
snd_pcm_pipewire_t *pw = io->private_data;
snd_pcm_sw_params_t *swparams;
const struct spa_pod *params[1];
uint8_t buffer[1024];
struct spa_pod_builder b = SPA_POD_BUILDER_INIT(buffer, sizeof(buffer));
struct pw_properties *props;
int res;
uint32_t min_period;
pw_thread_loop_lock(pw->main_loop);
snd_pcm_sw_params_alloca(&swparams);
if ((res = snd_pcm_sw_params_current(io->pcm, swparams)) == 0)
snd_pcm_sw_params_get_avail_min(swparams, &pw->min_avail);
else
pw->min_avail = io->period_size;
min_period = (MIN_PERIOD * io->rate / 48000);
pw->min_avail = SPA_MAX(pw->min_avail, min_period);
pw_log_debug("prepare %d %p %lu %ld", pw->error, pw->stream, io->period_size, pw->min_avail);
if (!pw->error && pw->stream != NULL)
goto done;
if (pw->stream != NULL) {
pw_stream_destroy(pw->stream);
pw->stream = NULL;
}
props = pw_properties_new(PW_KEY_CLIENT_API, "alsa", NULL);
pw_properties_setf(props, PW_KEY_NODE_LATENCY, "%lu/%u", pw->min_avail, io->rate);
pw_properties_set(props, PW_KEY_MEDIA_TYPE, "Audio");
pw_properties_set(props, PW_KEY_MEDIA_CATEGORY,
io->stream == SND_PCM_STREAM_PLAYBACK ?
"Playback" : "Capture");
pw_properties_set(props, PW_KEY_MEDIA_ROLE, "Music");
pw->stream = pw_stream_new(pw->remote, pw->node_name, props);
if (pw->stream == NULL)
goto error;
pw_stream_add_listener(pw->stream, &pw->stream_listener, &stream_events, pw);
params[0] = spa_format_audio_raw_build(&b, SPA_PARAM_EnumFormat, &pw->format);
pw->error = false;
pw_stream_connect(pw->stream,
io->stream == SND_PCM_STREAM_PLAYBACK ?
PW_DIRECTION_OUTPUT :
PW_DIRECTION_INPUT,
pw->target,
pw->flags |
PW_STREAM_FLAG_AUTOCONNECT |
PW_STREAM_FLAG_MAP_BUFFERS |
PW_STREAM_FLAG_RT_PROCESS,
params, 1);
done:
pw->hw_ptr = 0;
pw_thread_loop_unlock(pw->main_loop);
return 0;
error:
pw_thread_loop_unlock(pw->main_loop);
return -ENOMEM;
}
static int snd_pcm_pipewire_start(snd_pcm_ioplug_t *io)
{
snd_pcm_pipewire_t *pw = io->private_data;
pw_thread_loop_lock(pw->main_loop);
if (!pw->activated && pw->stream != NULL) {
pw_stream_set_active(pw->stream, true);
pw->activated = true;
}
pw_thread_loop_unlock(pw->main_loop);
return 0;
}
static int snd_pcm_pipewire_stop(snd_pcm_ioplug_t *io)
{
snd_pcm_pipewire_t *pw = io->private_data;
pw_thread_loop_lock(pw->main_loop);
if (pw->activated && pw->stream != NULL) {
pw_stream_set_active(pw->stream, false);
pw->activated = false;
}
pw_thread_loop_unlock(pw->main_loop);
return 0;
}
#if __BYTE_ORDER == __BIG_ENDIAN
#define _FORMAT_LE(p, fmt) p ? SPA_AUDIO_FORMAT_UNKNOWN : SPA_AUDIO_FORMAT_ ## fmt ## _OE
#define _FORMAT_BE(p, fmt) p ? SPA_AUDIO_FORMAT_ ## fmt ## P : SPA_AUDIO_FORMAT_ ## fmt
#elif __BYTE_ORDER == __LITTLE_ENDIAN
#define _FORMAT_LE(p, fmt) p ? SPA_AUDIO_FORMAT_ ## fmt ## P : SPA_AUDIO_FORMAT_ ## fmt
#define _FORMAT_BE(p, fmt) p ? SPA_AUDIO_FORMAT_UNKNOWN : SPA_AUDIO_FORMAT_ ## fmt ## _OE
#endif
static int set_default_channels(struct spa_audio_info_raw *info)
{
switch (info->channels) {
case 7:
info->position[5] = SPA_AUDIO_CHANNEL_SL;
info->position[6] = SPA_AUDIO_CHANNEL_SR;
/* Fall through */
case 5:
info->position[3] = SPA_AUDIO_CHANNEL_RL;
info->position[4] = SPA_AUDIO_CHANNEL_RR;
info->position[2] = SPA_AUDIO_CHANNEL_FC;
info->position[0] = SPA_AUDIO_CHANNEL_FL;
info->position[1] = SPA_AUDIO_CHANNEL_FR;
return 1;
case 8:
info->position[6] = SPA_AUDIO_CHANNEL_SL;
info->position[7] = SPA_AUDIO_CHANNEL_SR;
/* Fall through */
case 6:
info->position[4] = SPA_AUDIO_CHANNEL_RL;
info->position[5] = SPA_AUDIO_CHANNEL_RR;
/* Fall through */
case 4:
info->position[3] = SPA_AUDIO_CHANNEL_LFE;
/* Fall through */
case 3:
info->position[2] = SPA_AUDIO_CHANNEL_FC;
/* Fall through */
case 2:
info->position[0] = SPA_AUDIO_CHANNEL_FL;
info->position[1] = SPA_AUDIO_CHANNEL_FR;
return 1;
case 1:
info->position[0] = SPA_AUDIO_CHANNEL_MONO;
return 1;
default:
return 0;
}
}
static int snd_pcm_pipewire_hw_params(snd_pcm_ioplug_t * io,
snd_pcm_hw_params_t * params)
{
snd_pcm_pipewire_t *pw = io->private_data;
bool planar;
pw_log_debug("hw_params %lu %lu", io->buffer_size, io->period_size);
switch(io->access) {
case SND_PCM_ACCESS_MMAP_INTERLEAVED:
case SND_PCM_ACCESS_RW_INTERLEAVED:
planar = false;
break;
case SND_PCM_ACCESS_MMAP_NONINTERLEAVED:
case SND_PCM_ACCESS_RW_NONINTERLEAVED:
planar = true;
break;
default:
SNDERR("PipeWire: invalid access: %d\n", io->access);
return -EINVAL;
}
switch(io->format) {
case SND_PCM_FORMAT_U8:
pw->format.format = planar ? SPA_AUDIO_FORMAT_U8P : SPA_AUDIO_FORMAT_U8;
break;
case SND_PCM_FORMAT_S16_LE:
pw->format.format = _FORMAT_LE(planar, S16);
break;
case SND_PCM_FORMAT_S16_BE:
pw->format.format = _FORMAT_BE(planar, S16);
break;
case SND_PCM_FORMAT_S24_LE:
pw->format.format = _FORMAT_LE(planar, S24_32);
break;
case SND_PCM_FORMAT_S24_BE:
pw->format.format = _FORMAT_BE(planar, S24_32);
break;
case SND_PCM_FORMAT_S32_LE:
pw->format.format = _FORMAT_LE(planar, S32);
break;
case SND_PCM_FORMAT_S32_BE:
pw->format.format = _FORMAT_BE(planar, S32);
break;
case SND_PCM_FORMAT_S24_3LE:
pw->format.format = _FORMAT_LE(planar, S24);
break;
case SND_PCM_FORMAT_S24_3BE:
pw->format.format = _FORMAT_BE(planar, S24);
break;
case SND_PCM_FORMAT_FLOAT_LE:
pw->format.format = _FORMAT_LE(planar, F32);
break;
case SND_PCM_FORMAT_FLOAT_BE:
pw->format.format = _FORMAT_BE(planar, F32);
break;
default:
SNDERR("PipeWire: invalid format: %d\n", io->format);
return -EINVAL;
}
pw->format.channels = io->channels;
pw->format.rate = io->rate;
set_default_channels(&pw->format);
pw->sample_bits = snd_pcm_format_physical_width(io->format);
return 0;
}
struct chmap_info {
enum snd_pcm_chmap_position pos;
enum spa_audio_channel channel;
};
static const struct chmap_info chmap_info[] = {
[SND_CHMAP_UNKNOWN] = { SND_CHMAP_UNKNOWN, SPA_AUDIO_CHANNEL_UNKNOWN },
[SND_CHMAP_NA] = { SND_CHMAP_NA, SPA_AUDIO_CHANNEL_NA },
[SND_CHMAP_MONO] = { SND_CHMAP_MONO, SPA_AUDIO_CHANNEL_MONO },
[SND_CHMAP_FL] = { SND_CHMAP_FL, SPA_AUDIO_CHANNEL_FL },
[SND_CHMAP_FR] = { SND_CHMAP_FR, SPA_AUDIO_CHANNEL_FR },
[SND_CHMAP_RL] = { SND_CHMAP_RL, SPA_AUDIO_CHANNEL_RL },
[SND_CHMAP_RR] = { SND_CHMAP_RR, SPA_AUDIO_CHANNEL_RR },
[SND_CHMAP_FC] = { SND_CHMAP_FC, SPA_AUDIO_CHANNEL_FC },
[SND_CHMAP_LFE] = { SND_CHMAP_LFE, SPA_AUDIO_CHANNEL_LFE },
[SND_CHMAP_SL] = { SND_CHMAP_SL, SPA_AUDIO_CHANNEL_SL },
[SND_CHMAP_SR] = { SND_CHMAP_SR, SPA_AUDIO_CHANNEL_SR },
[SND_CHMAP_RC] = { SND_CHMAP_RC, SPA_AUDIO_CHANNEL_RC },
[SND_CHMAP_FLC] = { SND_CHMAP_FLC, SPA_AUDIO_CHANNEL_FLC },
[SND_CHMAP_FRC] = { SND_CHMAP_FRC, SPA_AUDIO_CHANNEL_FRC },
[SND_CHMAP_RLC] = { SND_CHMAP_RLC, SPA_AUDIO_CHANNEL_RLC },
[SND_CHMAP_RRC] = { SND_CHMAP_RRC, SPA_AUDIO_CHANNEL_RRC },
[SND_CHMAP_FLW] = { SND_CHMAP_FLW, SPA_AUDIO_CHANNEL_FLW },
[SND_CHMAP_FRW] = { SND_CHMAP_FRW, SPA_AUDIO_CHANNEL_FRW },
[SND_CHMAP_FLH] = { SND_CHMAP_FLH, SPA_AUDIO_CHANNEL_FLH },
[SND_CHMAP_FCH] = { SND_CHMAP_FCH, SPA_AUDIO_CHANNEL_FCH },
[SND_CHMAP_FRH] = { SND_CHMAP_FRH, SPA_AUDIO_CHANNEL_FRH },
[SND_CHMAP_TC] = { SND_CHMAP_TC, SPA_AUDIO_CHANNEL_TC },
[SND_CHMAP_TFL] = { SND_CHMAP_TFL, SPA_AUDIO_CHANNEL_TFL },
[SND_CHMAP_TFR] = { SND_CHMAP_TFR, SPA_AUDIO_CHANNEL_TFR },
[SND_CHMAP_TFC] = { SND_CHMAP_TFC, SPA_AUDIO_CHANNEL_TFC },
[SND_CHMAP_TRL] = { SND_CHMAP_TRL, SPA_AUDIO_CHANNEL_TRL },
[SND_CHMAP_TRR] = { SND_CHMAP_TRR, SPA_AUDIO_CHANNEL_TRR },
[SND_CHMAP_TRC] = { SND_CHMAP_TRC, SPA_AUDIO_CHANNEL_TRC },
[SND_CHMAP_TFLC] = { SND_CHMAP_TFLC, SPA_AUDIO_CHANNEL_TFLC },
[SND_CHMAP_TFRC] = { SND_CHMAP_TFRC, SPA_AUDIO_CHANNEL_TFRC },
[SND_CHMAP_TSL] = { SND_CHMAP_TSL, SPA_AUDIO_CHANNEL_TSL },
[SND_CHMAP_TSR] = { SND_CHMAP_TSR, SPA_AUDIO_CHANNEL_TSR },
[SND_CHMAP_LLFE] = { SND_CHMAP_LLFE, SPA_AUDIO_CHANNEL_LLFE },
[SND_CHMAP_RLFE] = { SND_CHMAP_RLFE, SPA_AUDIO_CHANNEL_RLFE },
[SND_CHMAP_BC] = { SND_CHMAP_BC, SPA_AUDIO_CHANNEL_BC },
[SND_CHMAP_BLC] = { SND_CHMAP_BLC, SPA_AUDIO_CHANNEL_BLC },
[SND_CHMAP_BRC] = { SND_CHMAP_BRC, SPA_AUDIO_CHANNEL_BRC },
};
static enum snd_pcm_chmap_position channel_to_chmap(enum spa_audio_channel channel)
{
uint32_t i;
for (i = 0; i < SPA_N_ELEMENTS(chmap_info); i++)
if (chmap_info[i].channel == channel)
return chmap_info[i].pos;
return SND_CHMAP_UNKNOWN;
}
static int snd_pcm_pipewire_set_chmap(snd_pcm_ioplug_t * io,
const snd_pcm_chmap_t * map)
{
return 1;
}
static snd_pcm_chmap_t * snd_pcm_pipewire_get_chmap(snd_pcm_ioplug_t * io)
{
snd_pcm_pipewire_t *pw = io->private_data;
snd_pcm_chmap_t *map;
uint32_t i;
map = calloc(1, sizeof(snd_pcm_chmap_t) +
pw->format.channels * sizeof(unsigned int));
map->channels = pw->format.channels;
for (i = 0; i < pw->format.channels; i++)
map->pos[i] = channel_to_chmap(pw->format.position[i]);
return map;
}
static void make_map(snd_pcm_chmap_query_t **maps, int index, int channels, ...)
{
va_list args;
int i;
maps[index] = malloc(sizeof(snd_pcm_chmap_query_t) + (channels * sizeof(unsigned int)));
maps[index]->type = SND_CHMAP_TYPE_FIXED;
maps[index]->map.channels = channels;
va_start(args, channels);
for (i = 0; i < channels; i++)
maps[index]->map.pos[i] = va_arg(args, int);
va_end(args);
}
static snd_pcm_chmap_query_t **snd_pcm_pipewire_query_chmaps(snd_pcm_ioplug_t *io)
{
snd_pcm_chmap_query_t **maps;
maps = calloc(9, sizeof(*maps));
make_map(maps, 0, 1, SND_CHMAP_MONO);
make_map(maps, 1, 2, SND_CHMAP_FL, SND_CHMAP_FR);
make_map(maps, 2, 3, SND_CHMAP_FL, SND_CHMAP_FR, SND_CHMAP_FC);
make_map(maps, 3, 4, SND_CHMAP_FL, SND_CHMAP_FR, SND_CHMAP_FC, SND_CHMAP_LFE);
make_map(maps, 4, 5, SND_CHMAP_FL, SND_CHMAP_FR, SND_CHMAP_FC, SND_CHMAP_RL, SND_CHMAP_RR);
make_map(maps, 5, 6, SND_CHMAP_FL, SND_CHMAP_FR, SND_CHMAP_FC, SND_CHMAP_LFE, SND_CHMAP_RL, SND_CHMAP_RR);
make_map(maps, 6, 7, SND_CHMAP_FL, SND_CHMAP_FR, SND_CHMAP_FC,
SND_CHMAP_SL, SND_CHMAP_SR, SND_CHMAP_RL, SND_CHMAP_RR);
make_map(maps, 7, 8, SND_CHMAP_FL, SND_CHMAP_FR, SND_CHMAP_FC, SND_CHMAP_LFE,
SND_CHMAP_SL, SND_CHMAP_SR, SND_CHMAP_RL, SND_CHMAP_RR);
return maps;
}
static snd_pcm_ioplug_callback_t pipewire_pcm_callback = {
.close = snd_pcm_pipewire_close,
.start = snd_pcm_pipewire_start,
.stop = snd_pcm_pipewire_stop,
.pointer = snd_pcm_pipewire_pointer,
.prepare = snd_pcm_pipewire_prepare,
.poll_revents = snd_pcm_pipewire_poll_revents,
.hw_params = snd_pcm_pipewire_hw_params,
.set_chmap = snd_pcm_pipewire_set_chmap,
.get_chmap = snd_pcm_pipewire_get_chmap,
.query_chmaps = snd_pcm_pipewire_query_chmaps,
};
static int pipewire_set_hw_constraint(snd_pcm_pipewire_t *pw)
{
unsigned int access_list[] = {
SND_PCM_ACCESS_MMAP_INTERLEAVED,
SND_PCM_ACCESS_MMAP_NONINTERLEAVED,
SND_PCM_ACCESS_RW_INTERLEAVED,
SND_PCM_ACCESS_RW_NONINTERLEAVED
};
unsigned int format_list[] = {
SND_PCM_FORMAT_FLOAT_LE,
SND_PCM_FORMAT_FLOAT_BE,
SND_PCM_FORMAT_S32_LE,
SND_PCM_FORMAT_S32_BE,
SND_PCM_FORMAT_S16_LE,
SND_PCM_FORMAT_S16_BE,
SND_PCM_FORMAT_S24_LE,
SND_PCM_FORMAT_S24_BE,
SND_PCM_FORMAT_S24_3LE,
SND_PCM_FORMAT_S24_3BE,
SND_PCM_FORMAT_U8,
};
int err;
if ((err = snd_pcm_ioplug_set_param_list(&pw->io, SND_PCM_IOPLUG_HW_ACCESS,
SPA_N_ELEMENTS(access_list), access_list)) < 0 ||
(err = snd_pcm_ioplug_set_param_list(&pw->io, SND_PCM_IOPLUG_HW_FORMAT,
SPA_N_ELEMENTS(format_list), format_list)) < 0 ||
(err = snd_pcm_ioplug_set_param_minmax(&pw->io, SND_PCM_IOPLUG_HW_CHANNELS,
1, MAX_CHANNELS)) < 0 ||
(err = snd_pcm_ioplug_set_param_minmax(&pw->io, SND_PCM_IOPLUG_HW_RATE,
1, MAX_RATE)) < 0 ||
(err = snd_pcm_ioplug_set_param_minmax(&pw->io, SND_PCM_IOPLUG_HW_BUFFER_BYTES,
16*1024, 4*1024*1024)) < 0 ||
(err = snd_pcm_ioplug_set_param_minmax(&pw->io, SND_PCM_IOPLUG_HW_PERIOD_BYTES,
128, 2*1024*1024)) < 0 ||
(err = snd_pcm_ioplug_set_param_minmax(&pw->io, SND_PCM_IOPLUG_HW_PERIODS,
3, 64)) < 0)
return err;
return 0;
}
static void on_remote_state_changed(void *data, enum pw_remote_state old,
enum pw_remote_state state, const char *error)
{
snd_pcm_pipewire_t *pw = data;
switch (state) {
case PW_REMOTE_STATE_ERROR:
pw_log_error("error %s", error);
/* fallthrough */
case PW_REMOTE_STATE_UNCONNECTED:
pw->error = true;
if (pw->fd != -1)
pcm_poll_unblock_check(&pw->io);
/* fallthrough */
case PW_REMOTE_STATE_CONNECTED:
pw_thread_loop_signal(pw->main_loop, false);
break;
default:
break;
}
}
static const struct pw_remote_events remote_events = {
PW_VERSION_REMOTE_EVENTS,
.state_changed = on_remote_state_changed,
};
static int remote_connect_sync(snd_pcm_pipewire_t *pw)
{
const char *error = NULL;
enum pw_remote_state state;
int res;
pw_thread_loop_lock(pw->main_loop);
if ((res = pw_remote_connect(pw->remote)) < 0) {
error = spa_strerror(res);
goto error;
}
while (true) {
state = pw_remote_get_state(pw->remote, &error);
if (state == PW_REMOTE_STATE_ERROR)
goto error;
if (state == PW_REMOTE_STATE_CONNECTED)
break;
pw_thread_loop_wait(pw->main_loop);
}
exit:
pw_thread_loop_unlock(pw->main_loop);
return res;
error:
SNDERR("PipeWire: Unable to connect: %s\n", error);
goto exit;
}
static int snd_pcm_pipewire_open(snd_pcm_t **pcmp, const char *name,
const char *node_name,
const char *playback_node,
const char *capture_node,
snd_pcm_stream_t stream,
int mode,
uint32_t flags)
{
snd_pcm_pipewire_t *pw;
int err;
const char *str;
struct pw_properties *props;
assert(pcmp);
pw = calloc(1, sizeof(*pw));
if (!pw)
return -ENOMEM;
str = getenv("PIPEWIRE_NODE");
pw_log_debug("open %s %d %d %08x '%s'", name, stream, mode, flags, str);
pw->fd = -1;
pw->io.poll_fd = -1;
pw->flags = flags;
if (node_name == NULL)
err = asprintf(&pw->node_name, "ALSA %s",
stream == SND_PCM_STREAM_PLAYBACK ? "Playback" : "Capture");
else
pw->node_name = strdup(node_name);
pw->target = SPA_ID_INVALID;
if (str != NULL)
pw->target = atoi(str);
else {
if (stream == SND_PCM_STREAM_PLAYBACK)
pw->target = playback_node ? (uint32_t)atoi(playback_node) : SPA_ID_INVALID;
else
pw->target = capture_node ? (uint32_t)atoi(capture_node) : SPA_ID_INVALID;
}
pw->loop = pw_loop_new(NULL);
pw->main_loop = pw_thread_loop_new(pw->loop, "alsa-pipewire");
pw->core = pw_core_new(pw->loop, NULL, 0);
props = pw_properties_new(NULL, NULL);
str = pw_get_prgname();
if (str)
pw_properties_setf(props, PW_KEY_APP_NAME, "ALSA plug-in [%s]", str);
else
pw_properties_set(props, PW_KEY_APP_NAME, "ALSA plug-in");
pw->remote = pw_remote_new(pw->core, props, 0);
pw_remote_add_listener(pw->remote, &pw->remote_listener, &remote_events, pw);
if ((err = pw_thread_loop_start(pw->main_loop)) < 0)
goto error;
if ((err = remote_connect_sync(pw)) < 0)
goto error;
pw->fd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
pw->io.version = SND_PCM_IOPLUG_VERSION;
pw->io.name = "ALSA <-> PipeWire PCM I/O Plugin";
pw->io.callback = &pipewire_pcm_callback;
pw->io.private_data = pw;
pw->io.poll_fd = pw->fd;
pw->io.poll_events = POLLIN;
pw->io.mmap_rw = 1;
if ((err = snd_pcm_ioplug_create(&pw->io, name, stream, mode)) < 0)
goto error;
pw_log_debug("open %s %d %d", name, pw->io.stream, mode);
if ((err = pipewire_set_hw_constraint(pw)) < 0)
goto error;
*pcmp = pw->io.pcm;
return 0;
error:
snd_pcm_pipewire_free(pw);
return err;
}
SPA_EXPORT
SND_PCM_PLUGIN_DEFINE_FUNC(pipewire)
{
snd_config_iterator_t i, next;
const char *node_name = NULL;
const char *server_name = NULL;
const char *playback_node = NULL;
const char *capture_node = NULL;
uint32_t flags = 0;
int err;
pw_init(NULL, NULL);
snd_config_for_each(i, next, conf) {
snd_config_t *n = snd_config_iterator_entry(i);
const char *id;
if (snd_config_get_id(n, &id) < 0)
continue;
if (strcmp(id, "comment") == 0 || strcmp(id, "type") == 0 || strcmp(id, "hint") == 0)
continue;
if (strcmp(id, "name") == 0) {
snd_config_get_string(n, &node_name);
continue;
}
if (strcmp(id, "server") == 0) {
snd_config_get_string(n, &server_name);
continue;
}
if (strcmp(id, "playback_node") == 0) {
snd_config_get_string(n, &playback_node);
continue;
}
if (strcmp(id, "capture_node") == 0) {
snd_config_get_string(n, &capture_node);
continue;
}
if (strcmp(id, "exclusive") == 0) {
if (snd_config_get_bool(n))
flags |= PW_STREAM_FLAG_EXCLUSIVE;
continue;
}
SNDERR("Unknown field %s", id);
return -EINVAL;
}
err = snd_pcm_pipewire_open(pcmp, name, node_name, playback_node, capture_node, stream, mode, flags);
return err;
}
SPA_EXPORT
SND_PCM_PLUGIN_SYMBOL(pipewire);

52
pipewire-alsa/conf/50-pipewire.conf Normal file
View file

@ -0,0 +1,52 @@
# Add a specific named PipeWire pcm
defaults.pipewire.server "pipewire-0"
defaults.pipewire.node "-1"
defaults.pipewire.exclusive false
pcm.pipewire {
@args [ SERVER NODE EXCLUSIVE ]
@args.SERVER {
type string
default {
@func refer
name defaults.pipewire.server
}
}
@args.NODE {
type string
default {
@func refer
name defaults.pipewire.node
}
}
@args.EXCLUSIVE {
type integer
default {
@func refer
name defaults.pipewire.exclusive
}
}
type pipewire
server $SERVER
playback_node $NODE
capture_node $NODE
exclusive $EXCLUSIVE
hint {
show on
description "PipeWire Sound Server"
}
}
pcm.!default {
type pipewire
playback_node "-1"
capture_node "-1"
hint {
show on
description "Default ALSA Output (currently PipeWire Media Server)"
}
#fallback "sysdefault"
}