diff --git a/alsa-plugins/meson.build b/alsa-plugins/meson.build new file mode 100644 index 000000000..9777acc89 --- /dev/null +++ b/alsa-plugins/meson.build @@ -0,0 +1,17 @@ +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'), +) diff --git a/alsa-plugins/pcm_pipewire.c b/alsa-plugins/pcm_pipewire.c new file mode 100644 index 000000000..504132c4e --- /dev/null +++ b/alsa-plugins/pcm_pipewire.c @@ -0,0 +1,780 @@ +/* + * PCM - PipeWire plugin + * + * Copyright (c) 2017 Wim Taymans + * + * 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 + +#include +#include +#include +#include +#include +#include + +#include +#include + +#include +#include +#include +#include +#include +#include + +#include + +struct type { + uint32_t format; + uint32_t props; + struct spa_type_meta meta; + struct spa_type_data data; + struct spa_type_media_type media_type; + struct spa_type_media_subtype media_subtype; + struct spa_type_format_audio format_audio; + struct spa_type_audio_format audio_format; +}; + +static inline void init_type(struct type *type, struct spa_type_map *map) +{ + type->format = spa_type_map_get_id(map, SPA_TYPE__Format); + type->props = spa_type_map_get_id(map, SPA_TYPE__Props); + spa_type_meta_map(map, &type->meta); + spa_type_data_map(map, &type->data); + spa_type_media_type_map(map, &type->media_type); + spa_type_media_subtype_map(map, &type->media_subtype); + spa_type_format_audio_map(map, &type->format_audio); + spa_type_audio_format_map(map, &type->audio_format); +} + +struct buffer { + struct spa_buffer *buffer; + struct spa_list link; + void *ptr; + size_t size; + bool mapped; + bool used; +}; + +typedef enum _pipewire_format { + SND_PCM_PIPEWIRE_FORMAT_RAW +} snd_pcm_pipewire_format_t; + +typedef struct { + snd_pcm_ioplug_t io; + + int fd; + int activated; /* PipeWire is activated? */ + + unsigned int num_ports; + unsigned int hw_ptr; + unsigned int sample_bits; + snd_pcm_uframes_t min_avail; + + struct type type; + struct pw_loop *loop; + struct pw_thread_loop *main_loop; + struct pw_core *core; + struct pw_type *t; + + struct pw_remote *remote; + struct spa_hook remote_listener; + + struct pw_node *node; + + struct spa_node impl_node; + const struct spa_node_callbacks *callbacks; + void *callbacks_data; + struct spa_port_io *port_io; + struct spa_port_info port_info; + + uint8_t buffer[1024]; + struct spa_audio_info_raw format; + + uint8_t params_buffer[1024]; + struct spa_param *params[2]; + + struct buffer buffers[32]; + int n_buffers; + struct spa_list empty; + +} 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 < pw->min_avail) { + read(io->poll_fd, &val, sizeof(val)); + return 1; + } + } + + return 0; +} + +static int pcm_poll_unblock_check(snd_pcm_ioplug_t *io) +{ + uint64_t val = 1; + snd_pcm_sframes_t avail; + snd_pcm_pipewire_t *pw = io->private_data; + + avail = snd_pcm_avail_update(io->pcm); + if (avail < 0 || avail >= pw->min_avail) { + write(pw->fd, &val, sizeof(val)); + return 1; + } + + return 0; +} + +static void snd_pcm_pipewire_free(snd_pcm_pipewire_t *pw) +{ + if (pw) { + 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) +{ + assert(pfds && nfds == 1 && revents); + + *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; + return pw->hw_ptr; +} + +static int +snd_pcm_pipewire_process(snd_pcm_pipewire_t *pw, struct 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; + snd_pcm_uframes_t nframes; + + bps = io->channels * pw->sample_bits; + nframes = b->buffer->datas[0].chunk->size / (bps / 8); + + pwareas = alloca(io->channels * sizeof(snd_pcm_channel_area_t)); + + for (channel = 0; channel < io->channels; channel++) { + pwareas[channel].addr = b->ptr; + pwareas[channel].first = channel * pw->sample_bits; + pwareas[channel].step = bps; + } + + if (io->state != SND_PCM_STATE_RUNNING) { + if (io->stream == SND_PCM_STREAM_PLAYBACK) { + for (channel = 0; channel < io->channels; channel++) + snd_pcm_area_silence(&pwareas[channel], 0, nframes, io->format); + return 0; + } + } + + areas = snd_pcm_ioplug_mmap_areas(io); + + 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; + + if (io->stream == SND_PCM_STREAM_PLAYBACK) + snd_pcm_areas_copy(pwareas, xfer, + areas, offset, + io->channels, frames, io->format); + else + 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 */ + + return 0; +} + +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; + int err; + + pw->hw_ptr = 0; + + pw->min_avail = io->period_size; + snd_pcm_sw_params_alloca(&swparams); + err = snd_pcm_sw_params_current(io->pcm, swparams); + if (err == 0) { + snd_pcm_sw_params_get_avail_min(swparams, &pw->min_avail); + } + + /* deactivate PipeWire connections if this is XRUN recovery */ + snd_pcm_pipewire_stop(io); + + if (io->stream == SND_PCM_STREAM_PLAYBACK) + pcm_poll_unblock_check(io); /* playback pcm initially accepts writes */ + else + pcm_poll_block_check(io); /* block capture pcm if that's XRUN recovery */ + + return 0; +} + +static int snd_pcm_pipewire_start(snd_pcm_ioplug_t *io) +{ + snd_pcm_pipewire_t *pw = io->private_data; + + pw_node_set_active(pw->node, true); + pw->activated = 1; + + return 0; +} + +static int snd_pcm_pipewire_stop(snd_pcm_ioplug_t *io) +{ + snd_pcm_pipewire_t *pw = io->private_data; + + if (pw->activated) { + pw_node_set_active(pw->node, false); + pw->activated = 0; + } + return 0; +} + +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, +}; + +#define ARRAY_SIZE(ary) (sizeof(ary)/sizeof(ary[0])) + +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 = SND_PCM_FORMAT_S16_LE; + unsigned int rate = 44100; + int err; + + pw->sample_bits = snd_pcm_format_physical_width(format); + if ((err = snd_pcm_ioplug_set_param_list(&pw->io, SND_PCM_IOPLUG_HW_ACCESS, + ARRAY_SIZE(access_list), access_list)) < 0 || + (err = snd_pcm_ioplug_set_param_list(&pw->io, SND_PCM_IOPLUG_HW_FORMAT, + 1, &format)) < 0 || + (err = snd_pcm_ioplug_set_param_minmax(&pw->io, SND_PCM_IOPLUG_HW_CHANNELS, + 2, 2)) < 0 || + (err = snd_pcm_ioplug_set_param_minmax(&pw->io, SND_PCM_IOPLUG_HW_RATE, + rate, rate)) < 0 || + (err = snd_pcm_ioplug_set_param_minmax(&pw->io, SND_PCM_IOPLUG_HW_PERIOD_BYTES, + 128, 64*1024)) < 0 || + (err = snd_pcm_ioplug_set_param_minmax(&pw->io, SND_PCM_IOPLUG_HW_PERIODS, + 2, 64)) < 0) + return err; + + return 0; +} + +static int impl_send_command(struct spa_node *node, const struct spa_command *command) +{ + return SPA_RESULT_OK; +} + +static int impl_set_callbacks(struct spa_node *node, + const struct spa_node_callbacks *callbacks, void *data) +{ + snd_pcm_pipewire_t *d = SPA_CONTAINER_OF(node, snd_pcm_pipewire_t, impl_node); + d->callbacks = callbacks; + d->callbacks_data = data; + return SPA_RESULT_OK; +} + +static int impl_get_n_ports(struct spa_node *node, + uint32_t *n_input_ports, + uint32_t *max_input_ports, + uint32_t *n_output_ports, + uint32_t *max_output_ports) +{ + *n_input_ports = *max_input_ports = 0; + *n_output_ports = *max_output_ports = 1; + return SPA_RESULT_OK; +} + +static int impl_get_port_ids(struct spa_node *node, + uint32_t n_input_ports, + uint32_t *input_ids, + uint32_t n_output_ports, + uint32_t *output_ids) +{ + if (n_output_ports > 0) + output_ids[0] = 0; + return SPA_RESULT_OK; +} + +static int impl_port_set_io(struct spa_node *node, enum spa_direction direction, uint32_t port_id, + struct spa_port_io *io) +{ + snd_pcm_pipewire_t *d = SPA_CONTAINER_OF(node, snd_pcm_pipewire_t, impl_node); + d->port_io = io; + return SPA_RESULT_OK; +} + +static int impl_port_enum_formats(struct spa_node *node, enum spa_direction direction, uint32_t port_id, + struct spa_format **format, + const struct spa_format *filter, + uint32_t index) +{ + snd_pcm_pipewire_t *d = SPA_CONTAINER_OF(node, snd_pcm_pipewire_t, impl_node); + struct spa_pod_builder b = SPA_POD_BUILDER_INIT(d->buffer, sizeof(d->buffer)); + + if (index != 0) + return SPA_RESULT_ENUM_END; + + *format = spa_pod_builder_format(&b, d->type.format, + d->type.media_type.audio, d->type.media_subtype.raw, + ":", d->type.format_audio.format, "I", d->type.audio_format.S16, + ":", d->type.format_audio.channels, "i", 2, + ":", d->type.format_audio.rate, "i", 44100); + + return SPA_RESULT_OK; +} + +static int impl_port_set_format(struct spa_node *node, enum spa_direction direction, uint32_t port_id, + uint32_t flags, const struct spa_format *format) +{ + snd_pcm_pipewire_t *d = SPA_CONTAINER_OF(node, snd_pcm_pipewire_t, impl_node); + struct pw_type *t = d->t; + struct spa_pod_builder b = { NULL }; + + if (format == NULL) + return SPA_RESULT_OK; + + if (spa_format_audio_raw_parse(format, &d->format, &d->type.format_audio) < 0) + return SPA_RESULT_INVALID_MEDIA_TYPE; + + if (d->format.format != d->type.audio_format.S16) + return SPA_RESULT_ERROR; + + spa_pod_builder_init(&b, d->params_buffer, sizeof(d->params_buffer)); + d->params[0] = spa_pod_builder_param(&b, + t->param_alloc_buffers.Buffers, + ":", t->param_alloc_buffers.size, "iru", 1024, + 2, 32, 4096, + ":", t->param_alloc_buffers.stride, "i", 0, + ":", t->param_alloc_buffers.buffers, "iru", 2, + 2, 2, 32, + ":", t->param_alloc_buffers.align, "i", 16); + + d->params[1] = spa_pod_builder_param(&b, + t->param_alloc_meta_enable.MetaEnable, + ":", t->param_alloc_meta_enable.type, "I", t->meta.Header, + ":", t->param_alloc_meta_enable.size, "i", sizeof(struct spa_meta_header)); + + return SPA_RESULT_OK; +} + +static int impl_port_get_format(struct spa_node *node, enum spa_direction direction, uint32_t port_id, + const struct spa_format **format) +{ + snd_pcm_pipewire_t *d = SPA_CONTAINER_OF(node, snd_pcm_pipewire_t, impl_node); + struct spa_pod_builder b = SPA_POD_BUILDER_INIT(d->buffer, sizeof(d->buffer)); + + *format = spa_pod_builder_format(&b, d->type.format, + d->type.media_type.audio, d->type.media_subtype.raw, + ":", d->type.format_audio.format, "I", d->format.format, + ":", d->type.format_audio.channels, "i", d->format.channels, + ":", d->type.format_audio.rate, "i", d->format.rate); + + return SPA_RESULT_OK; +} + +static int impl_port_get_info(struct spa_node *node, enum spa_direction direction, uint32_t port_id, + const struct spa_port_info **info) +{ + snd_pcm_pipewire_t *d = SPA_CONTAINER_OF(node, snd_pcm_pipewire_t, impl_node); + + d->port_info.flags = SPA_PORT_INFO_FLAG_CAN_USE_BUFFERS; + d->port_info.rate = 0; + d->port_info.props = NULL; + + *info = &d->port_info; + + return SPA_RESULT_OK; +} + +static int impl_port_enum_params(struct spa_node *node, enum spa_direction direction, uint32_t port_id, + uint32_t index, struct spa_param **param) +{ + snd_pcm_pipewire_t *d = SPA_CONTAINER_OF(node, snd_pcm_pipewire_t, impl_node); + + if (index >= 2) + return SPA_RESULT_ENUM_END; + + *param = d->params[index]; + + return SPA_RESULT_OK; +} + +static int impl_port_use_buffers(struct spa_node *node, enum spa_direction direction, uint32_t port_id, + struct spa_buffer **buffers, uint32_t n_buffers) +{ + snd_pcm_pipewire_t *d = SPA_CONTAINER_OF(node, snd_pcm_pipewire_t, impl_node); + int i; + for (i = 0; i < n_buffers; i++) { + struct buffer *b = &d->buffers[i]; + struct spa_data *datas = buffers[i]->datas; + + if (datas[0].data != NULL) { + b->ptr = datas[0].data; + b->mapped = false; + } + else if (datas[0].type == d->type.data.MemFd || + datas[0].type == d->type.data.DmaBuf) { + b->ptr = mmap(NULL, datas[0].maxsize + datas[0].mapoffset, PROT_WRITE, + MAP_SHARED, datas[0].fd, 0); + if (b->ptr == MAP_FAILED) { + pw_log_error("failed to buffer mem"); + return SPA_RESULT_ERROR; + + } + b->ptr = SPA_MEMBER(b->ptr, datas[0].mapoffset, void); + b->mapped = true; + } + else { + pw_log_error("invalid buffer mem"); + return SPA_RESULT_ERROR; + } + b->size = datas[0].maxsize; + b->buffer = buffers[i]; + pw_log_info("got buffer %d size %zd", i, b->size); + spa_list_append(&d->empty, &b->link); + b->used = false; + } + d->n_buffers = n_buffers; + return SPA_RESULT_OK; +} + +static inline void reuse_buffer(snd_pcm_pipewire_t *d, uint32_t id) +{ + struct buffer *b = &d->buffers[id]; + if (b->used) { + pw_log_trace("reuse buffer %d", id); + spa_list_append(&d->empty, &b->link); + b->used = false; + } +} + +static int impl_port_reuse_buffer(struct spa_node *node, uint32_t port_id, uint32_t buffer_id) +{ + snd_pcm_pipewire_t *d = SPA_CONTAINER_OF(node, snd_pcm_pipewire_t, impl_node); + reuse_buffer(d, buffer_id); + return SPA_RESULT_OK; +} + +static int impl_node_process_input(struct spa_node *node) +{ + return SPA_RESULT_OK; +} + +static int impl_node_process_output(struct spa_node *node) +{ + snd_pcm_pipewire_t *d = SPA_CONTAINER_OF(node, snd_pcm_pipewire_t, impl_node); + struct buffer *b; + struct spa_port_io *io = d->port_io; + + if (io->buffer_id < d->n_buffers) { + reuse_buffer(d, io->buffer_id); + io->buffer_id = SPA_ID_INVALID; + } + if (spa_list_is_empty(&d->empty)) { + pw_log_error("alsa-pipewire %p: out of buffers", d); + return SPA_RESULT_OUT_OF_BUFFERS; + } + b = spa_list_first(&d->empty, struct buffer, link); + spa_list_remove(&b->link); + b->used = true; + + snd_pcm_pipewire_process(d, b); + + io->buffer_id = b->buffer->id; + io->status = SPA_RESULT_HAVE_BUFFER; + + return SPA_RESULT_HAVE_BUFFER; +} + +static const struct spa_node impl_node = { + SPA_VERSION_NODE, + .send_command = impl_send_command, + .set_callbacks = impl_set_callbacks, + .get_n_ports = impl_get_n_ports, + .get_port_ids = impl_get_port_ids, + .port_set_io = impl_port_set_io, + .port_enum_formats = impl_port_enum_formats, + .port_set_format = impl_port_set_format, + .port_get_format = impl_port_get_format, + .port_get_info = impl_port_get_info, + .port_enum_params = impl_port_enum_params, + .port_use_buffers = impl_port_use_buffers, + .port_reuse_buffer = impl_port_reuse_buffer, + .process_output = impl_node_process_output, + .process_input = impl_node_process_input, +}; + + +static void on_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: + 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_state_changed, +}; + +static int pipewire_node_create(snd_pcm_pipewire_t *pw, + const char *node_name, + const char *target, + bool can_fallback) +{ + const char *error = NULL; + enum pw_remote_state state; + + pw_thread_loop_lock(pw->main_loop); + + if (pw_remote_connect(pw->remote) < 0) { + error = "connect failed"; + 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); + } + pw_log_debug("node %s", target); + pw->node = pw_node_new(pw->core, + node_name, + pw_properties_new(PW_NODE_PROP_AUTOCONNECT, "1", + PW_NODE_PROP_TARGET_NODE, target, + NULL), + 0); + pw->impl_node = impl_node; + pw_node_set_implementation(pw->node, &pw->impl_node); + pw_node_register(pw->node, NULL, NULL); + + pw_remote_export(pw->remote, pw->node); + pw_thread_loop_unlock(pw->main_loop); + + return 0; + + error: + if (!can_fallback) + SNDERR("PipeWire: Unable to connect: %s\n", error); + + pw_thread_loop_unlock(pw->main_loop); + + return -ECONNREFUSED; + +} + +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) +{ + snd_pcm_pipewire_t *pw; + int err; + static unsigned int num = 0; + char pipewire_node_name[32]; + const char *target; + + assert(pcmp); + pw = calloc(1, sizeof(*pw)); + if (!pw) + return -ENOMEM; + + pw->fd = -1; + pw->io.poll_fd = -1; + spa_list_init(&pw->empty); + + if (node_name == NULL) + err = snprintf(pipewire_node_name, sizeof(pipewire_node_name), + "alsa-pipewire.%s%s.%d.%d", name, + stream == SND_PCM_STREAM_PLAYBACK ? "P" : "C", + getpid(), num++); + else + err = snprintf(pipewire_node_name, sizeof(pipewire_node_name), + "%s", node_name); + + if (stream == SND_PCM_STREAM_PLAYBACK) + target = playback_node; + else + target = capture_node; + + 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); + pw->t = pw_core_get_type(pw->core); + init_type(&pw->type, pw->t->map); + spa_debug_set_type_map(pw->t->map); + + pw->remote = pw_remote_new(pw->core, NULL, 0); + pw_remote_add_listener(pw->remote, &pw->remote_listener, &remote_events, pw); + + err = pw_thread_loop_start(pw->main_loop); + if (err < 0) { + snd_pcm_pipewire_free(pw); + return err; + } + + err = pipewire_node_create(pw, pipewire_node_name, target, false); + if (err < 0) { + snd_pcm_pipewire_free(pw); + return err; + } + + 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; + + err = snd_pcm_ioplug_create(&pw->io, name, stream, mode); + if (err < 0) { + snd_pcm_pipewire_free(pw); + return err; + } + + err = pipewire_set_hw_constraint(pw); + if (err < 0) { + snd_pcm_ioplug_delete(&pw->io); + return err; + } + + *pcmp = pw->io.pcm; + + return 0; +} + + +SND_PCM_PLUGIN_DEFINE_FUNC(pipewire) +{ + snd_config_iterator_t i, next; + const char *node_name = NULL; + const char *playback_node = NULL; + const char *capture_node = NULL; + 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, "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; + } + SNDERR("Unknown field %s", id); + return -EINVAL; + } + + err = snd_pcm_pipewire_open(pcmp, name, node_name, playback_node, capture_node, stream, mode); + + return err; +} + +SND_PCM_PLUGIN_SYMBOL(pipewire);