Adding upstream version 0.3.65.upstream/0.3.65upstream

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

1 files changed, 1333 insertions, 0 deletions

diff --git a/pipewire-alsa/alsa-plugins/pcm_pipewire.c b/pipewire-alsa/alsa-plugins/pcm_pipewire.c
new file mode 100644
index 0000000..dc0cd81
--- /dev/null
+++ b/pipewire-alsa/alsa-plugins/pcm_pipewire.c
@@ -0,0 +1,1333 @@
+/* PCM - PipeWire plugin
+ *
+ * Copyright © 2017 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.
+ */
+
+#define __USE_GNU
+
+#include <limits.h>
+#if !defined(__FreeBSD__) && !defined(__MidnightBSD__)
+#include <byteswap.h>
+#endif
+#include <sys/shm.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/mman.h>
+
+#include <alsa/asoundlib.h>
+#include <alsa/pcm_external.h>
+
+#include <spa/param/audio/format-utils.h>
+#include <spa/debug/types.h>
+#include <spa/param/props.h>
+#include <spa/utils/result.h>
+#include <spa/utils/string.h>
+
+#include <pipewire/pipewire.h>
+
+#define ATOMIC_INC(s)                   __atomic_add_fetch(&(s), 1, __ATOMIC_SEQ_CST)
+#define ATOMIC_LOAD(s)                  __atomic_load_n(&(s), __ATOMIC_SEQ_CST)
+
+#define SEQ_WRITE(s)                    ATOMIC_INC(s)
+#define SEQ_WRITE_SUCCESS(s1,s2)        ((s1) + 1 == (s2) && ((s2) & 1) == 0)
+
+#define SEQ_READ(s)                     ATOMIC_LOAD(s)
+#define SEQ_READ_SUCCESS(s1,s2)         ((s1) == (s2) && ((s2) & 1) == 0)
+
+PW_LOG_TOPIC_STATIC(alsa_log_topic, "alsa.pcm");
+#define PW_LOG_TOPIC_DEFAULT alsa_log_topic
+
+#define MIN_BUFFERS	2u
+#define MAX_BUFFERS	64u
+
+#define MAX_CHANNELS	64
+#define MAX_RATE	(48000*8)
+
+#define MIN_PERIOD	64
+
+#define MIN_PERIOD_BYTES	(128)
+#define MAX_PERIOD_BYTES	(2*1024*1024)
+
+#define MIN_BUFFER_BYTES	(2*MIN_PERIOD_BYTES)
+#define MAX_BUFFER_BYTES	(2*MAX_PERIOD_BYTES)
+
+typedef struct {
+	snd_pcm_ioplug_t io;
+
+	snd_output_t *output;
+	FILE *log_file;
+
+	int fd;
+	int error;
+	unsigned int activated:1;	/* PipeWire is activated? */
+	unsigned int drained:1;
+	unsigned int draining:1;
+	unsigned int xrun_detected:1;
+	unsigned int hw_params_changed:1;
+	unsigned int active:1;
+
+	snd_pcm_uframes_t hw_ptr;
+	snd_pcm_uframes_t boundary;
+	snd_pcm_uframes_t min_avail;
+	unsigned int sample_bits;
+	uint32_t blocks;
+	uint32_t stride;
+
+	struct spa_system *system;
+	struct pw_thread_loop *main_loop;
+
+	struct pw_properties *props;
+	struct pw_context *context;
+
+	struct pw_core *core;
+	struct spa_hook core_listener;
+
+	struct pw_stream *stream;
+	struct spa_hook stream_listener;
+
+	int64_t delay;
+	uint64_t transfered;
+	uint64_t buffered;
+	int64_t now;
+	uintptr_t seq;
+
+	struct spa_audio_info_raw format;
+} snd_pcm_pipewire_t;
+
+static int snd_pcm_pipewire_stop(snd_pcm_ioplug_t *io);
+
+static int check_active(snd_pcm_ioplug_t *io)
+{
+	snd_pcm_pipewire_t *pw = io->private_data;
+	snd_pcm_sframes_t avail;
+	bool active;
+
+	avail = snd_pcm_ioplug_avail(io, pw->hw_ptr, io->appl_ptr);
+
+	if (io->state == SND_PCM_STATE_DRAINING) {
+		active = pw->drained;
+	}
+	else if (avail >= 0 && avail < (snd_pcm_sframes_t)pw->min_avail) {
+		active = false;
+	}
+	else if (avail >= (snd_pcm_sframes_t)pw->min_avail) {
+		active = true;
+	} else {
+		active = false;
+	}
+	if (pw->active != active) {
+		pw_log_trace("%p: avail:%lu min-avail:%lu state:%s hw:%lu appl:%lu active:%d->%d state:%s",
+			pw, avail, pw->min_avail, snd_pcm_state_name(io->state),
+			pw->hw_ptr, io->appl_ptr, pw->active, active,
+			snd_pcm_state_name(io->state));
+	}
+	return active;
+}
+
+
+static int update_active(snd_pcm_ioplug_t *io)
+{
+	snd_pcm_pipewire_t *pw = io->private_data;
+	pw->active = check_active(io);
+	uint64_t val;
+
+	if (pw->active || pw->error < 0)
+		spa_system_eventfd_write(pw->system, io->poll_fd, 1);
+	else
+		spa_system_eventfd_read(pw->system, io->poll_fd, &val);
+
+	return pw->active;
+}
+
+static void snd_pcm_pipewire_free(snd_pcm_pipewire_t *pw)
+{
+	if (pw == NULL)
+		return;
+
+	pw_log_debug("%p: free", pw);
+	if (pw->main_loop)
+		pw_thread_loop_stop(pw->main_loop);
+	if (pw->stream)
+		pw_stream_destroy(pw->stream);
+	if (pw->context)
+		pw_context_destroy(pw->context);
+	if (pw->fd >= 0)
+		spa_system_close(pw->system, pw->fd);
+	if (pw->main_loop)
+		pw_thread_loop_destroy(pw->main_loop);
+	pw_properties_free(pw->props);
+	snd_output_close(pw->output);
+	fclose(pw->log_file);
+	free(pw);
+}
+
+static int snd_pcm_pipewire_close(snd_pcm_ioplug_t *io)
+{
+	snd_pcm_pipewire_t *pw = io->private_data;
+	pw_log_debug("%p: close", pw);
+	snd_pcm_pipewire_free(pw);
+	return 0;
+}
+
+static int snd_pcm_pipewire_poll_descriptors(snd_pcm_ioplug_t *io, struct pollfd *pfds, unsigned int space)
+{
+	snd_pcm_pipewire_t *pw = io->private_data;
+	update_active(io);
+	pfds->fd = pw->fd;
+	pfds->events = POLLIN | POLLERR | POLLNVAL;
+	return 1;
+}
+
+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 < 0)
+		return pw->error;
+
+	*revents = pfds[0].revents & ~(POLLIN | POLLOUT);
+	if (pfds[0].revents & POLLIN && check_active(io)) {
+		*revents |= (io->stream == SND_PCM_STREAM_PLAYBACK) ? POLLOUT : POLLIN;
+		update_active(io);
+	}
+
+	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->xrun_detected)
+		return -EPIPE;
+	if (pw->error < 0)
+		return pw->error;
+	if (io->buffer_size == 0)
+		return 0;
+#ifdef SND_PCM_IOPLUG_FLAG_BOUNDARY_WA
+	return pw->hw_ptr;
+#else
+	return pw->hw_ptr % io->buffer_size;
+#endif
+}
+
+static int snd_pcm_pipewire_delay(snd_pcm_ioplug_t *io, snd_pcm_sframes_t *delayp)
+{
+	snd_pcm_pipewire_t *pw = io->private_data;
+	uintptr_t seq1, seq2;
+	int64_t elapsed = 0, delay, now, avail;
+	struct timespec ts;
+	int64_t diff;
+
+	do {
+		seq1 = SEQ_READ(pw->seq);
+
+		delay = pw->delay + pw->transfered;
+		now = pw->now;
+		if (io->stream == SND_PCM_STREAM_PLAYBACK)
+			avail = snd_pcm_ioplug_hw_avail(io, pw->hw_ptr, io->appl_ptr);
+		else
+			avail = snd_pcm_ioplug_avail(io, pw->hw_ptr, io->appl_ptr);
+
+		seq2 = SEQ_READ(pw->seq);
+	} while (!SEQ_READ_SUCCESS(seq1, seq2));
+
+	if (now != 0 && (io->state == SND_PCM_STATE_RUNNING ||
+	    io->state == SND_PCM_STATE_DRAINING)) {
+		clock_gettime(CLOCK_MONOTONIC, &ts);
+		diff = SPA_TIMESPEC_TO_NSEC(&ts) - now;
+		elapsed = (io->rate * diff) / SPA_NSEC_PER_SEC;
+
+		if (io->stream == SND_PCM_STREAM_PLAYBACK)
+			delay -= SPA_MIN(elapsed, delay);
+		else
+			delay += SPA_MIN(elapsed, (int64_t)io->buffer_size);
+	}
+
+	*delayp = delay + avail;
+
+	pw_log_trace("avail:%"PRIi64" filled %"PRIi64" elapsed:%"PRIi64" delay:%ld hw:%lu appl:%lu",
+			avail, delay, elapsed, *delayp, pw->hw_ptr, io->appl_ptr);
+
+	return 0;
+}
+
+static snd_pcm_uframes_t
+snd_pcm_pipewire_process(snd_pcm_pipewire_t *pw, struct pw_buffer *b,
+		snd_pcm_uframes_t *hw_avail,snd_pcm_uframes_t want)
+{
+	snd_pcm_ioplug_t *io = &pw->io;
+	snd_pcm_channel_area_t *pwareas;
+	snd_pcm_uframes_t xfer = 0;
+	snd_pcm_uframes_t nframes;
+	unsigned int channel;
+	struct spa_data *d;
+	void *ptr;
+	uint32_t bl, offset, size;
+
+	d = b->buffer->datas;
+	pwareas = alloca(io->channels * sizeof(snd_pcm_channel_area_t));
+
+	for (bl = 0; bl < pw->blocks; bl++) {
+		if (io->stream == SND_PCM_STREAM_PLAYBACK) {
+			size = SPA_MIN(d[bl].maxsize, pw->min_avail * pw->stride);
+		} else {
+			offset = SPA_MIN(d[bl].chunk->offset, d[bl].maxsize);
+			size = SPA_MIN(d[bl].chunk->size, d[bl].maxsize - offset);
+		}
+		want = SPA_MIN(want, size / pw->stride);
+	}
+	nframes = SPA_MIN(want, *hw_avail);
+
+	if (pw->blocks == 1) {
+		if (io->stream == SND_PCM_STREAM_PLAYBACK) {
+			d[0].chunk->size = want * pw->stride;
+			d[0].chunk->offset = offset = 0;
+		} else {
+			offset = SPA_MIN(d[0].chunk->offset, d[0].maxsize);
+		}
+		ptr = SPA_PTROFF(d[0].data, offset, void);
+		for (channel = 0; channel < io->channels; channel++) {
+			pwareas[channel].addr = ptr;
+			pwareas[channel].first = channel * pw->sample_bits;
+			pwareas[channel].step = io->channels * pw->sample_bits;
+		}
+	} else {
+		for (channel = 0; channel < io->channels; channel++) {
+			if (io->stream == SND_PCM_STREAM_PLAYBACK) {
+				d[channel].chunk->size = want * pw->stride;
+				d[channel].chunk->offset = offset = 0;
+			} else {
+				offset = SPA_MIN(d[channel].chunk->offset, d[channel].maxsize);
+			}
+			ptr = SPA_PTROFF(d[channel].data, offset, void);
+			pwareas[channel].addr = ptr;
+			pwareas[channel].first = 0;
+			pwareas[channel].step = pw->sample_bits;
+		}
+	}
+
+	if (io->state == SND_PCM_STATE_RUNNING ||
+		io->state == SND_PCM_STATE_DRAINING) {
+		snd_pcm_uframes_t hw_ptr = pw->hw_ptr;
+		xfer = nframes;
+		if (xfer > 0) {
+			const snd_pcm_channel_area_t *areas = snd_pcm_ioplug_mmap_areas(io);
+			const snd_pcm_uframes_t offset = hw_ptr % io->buffer_size;
+
+			if (io->stream == SND_PCM_STREAM_PLAYBACK)
+				snd_pcm_areas_copy_wrap(pwareas, 0, nframes,
+						areas, offset,
+						io->buffer_size,
+						io->channels, xfer,
+						io->format);
+			else
+				snd_pcm_areas_copy_wrap(areas, offset,
+						io->buffer_size,
+						pwareas, 0, nframes,
+						io->channels, xfer,
+						io->format);
+
+			hw_ptr += xfer;
+			if (hw_ptr >= pw->boundary)
+				hw_ptr -= pw->boundary;
+			pw->hw_ptr = hw_ptr;
+			*hw_avail -= xfer;
+		}
+	}
+	/* check if requested frames were copied */
+	if (xfer < want) {
+		/* always fill the not yet written PipeWire buffer with silence */
+		if (io->stream == SND_PCM_STREAM_PLAYBACK) {
+			const snd_pcm_uframes_t frames = want - xfer;
+
+			snd_pcm_areas_silence(pwareas, xfer, io->channels,
+							  frames, io->format);
+			xfer += frames;
+		}
+		if (io->state == SND_PCM_STATE_RUNNING ||
+			io->state == SND_PCM_STATE_DRAINING) {
+			/* report Xrun to user application */
+			pw->xrun_detected = true;
+		}
+	}
+	return xfer;
+}
+
+static void on_stream_param_changed(void *data, uint32_t id, const struct spa_pod *param)
+{
+	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 buffers, size;
+
+	if (param == NULL || id != SPA_PARAM_Format)
+		return;
+
+	io->period_size = pw->min_avail;
+
+	buffers = SPA_CLAMP(io->buffer_size / io->period_size, MIN_BUFFERS, MAX_BUFFERS);
+	size = io->period_size * pw->stride;
+
+	pw_log_info("%p: buffer_size:%lu period_size:%lu buffers:%u size:%u min_avail:%lu",
+			pw, io->buffer_size, io->period_size, buffers, 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(pw->blocks),
+			SPA_PARAM_BUFFERS_size,    SPA_POD_CHOICE_RANGE_Int(size, size, INT_MAX),
+			SPA_PARAM_BUFFERS_stride,  SPA_POD_Int(pw->stride));
+
+	pw_stream_update_params(pw->stream, params, n_params);
+}
+
+static void on_stream_drained(void *data)
+{
+	snd_pcm_pipewire_t *pw = data;
+	pw->drained = true;
+	pw->draining = false;
+	pw_log_debug("%p: drained", pw);
+	pw_thread_loop_signal(pw->main_loop, false);
+}
+
+static void on_stream_process(void *data)
+{
+	snd_pcm_pipewire_t *pw = data;
+	snd_pcm_ioplug_t *io = &pw->io;
+	struct pw_buffer *b;
+	snd_pcm_uframes_t hw_avail, before, want, xfer;
+	struct pw_time pwt;
+	int64_t delay;
+
+	pw_stream_get_time_n(pw->stream, &pwt, sizeof(pwt));
+
+	delay = pwt.delay;
+	if (pwt.rate.num != 0)
+		delay = delay * io->rate * pwt.rate.num / pwt.rate.denom;
+
+	before = hw_avail = snd_pcm_ioplug_hw_avail(io, pw->hw_ptr, io->appl_ptr);
+
+	if (pw->drained)
+		goto done;
+
+	b = pw_stream_dequeue_buffer(pw->stream);
+	if (b == NULL)
+		return;
+
+	want = b->requested ? b->requested : hw_avail;
+
+	SEQ_WRITE(pw->seq);
+
+	if (pw->now != pwt.now) {
+		pw->transfered = pw->buffered;
+		pw->buffered = 0;
+	}
+
+	xfer = snd_pcm_pipewire_process(pw, b, &hw_avail, want);
+
+	pw->delay = delay;
+	/* the buffer is now queued in the stream and consumed */
+	if (io->stream == SND_PCM_STREAM_PLAYBACK)
+		pw->transfered += xfer;
+
+	/* more then requested data transfered, use them in next iteration */
+	pw->buffered = (want == 0 || pw->transfered < want) ?  0 : (pw->transfered % want);
+
+	pw->now = pwt.now;
+	SEQ_WRITE(pw->seq);
+
+	pw_log_trace("%p: avail-before:%lu avail:%lu want:%lu xfer:%lu hw:%lu appl:%lu",
+			pw, before, hw_avail, want, xfer, pw->hw_ptr, io->appl_ptr);
+
+	pw_stream_queue_buffer(pw->stream, b);
+
+	if (io->state == SND_PCM_STATE_DRAINING && !pw->draining && hw_avail == 0) {
+		if (io->stream == SND_PCM_STREAM_CAPTURE) {
+			on_stream_drained (pw); /* since pw_stream does not call drained() for capture */
+		} else {
+			pw_stream_flush(pw->stream, true);
+			pw->draining = true;
+			pw->drained = false;
+		}
+	}
+done:
+	update_active(io);
+}
+
+static const struct pw_stream_events stream_events = {
+	PW_VERSION_STREAM_EVENTS,
+	.param_changed = on_stream_param_changed,
+	.process = on_stream_process,
+	.drained = on_stream_drained,
+};
+
+static int pipewire_start(snd_pcm_pipewire_t *pw)
+{
+	if (!pw->activated && pw->stream != NULL) {
+		pw_stream_set_active(pw->stream, true);
+		pw->activated = true;
+	}
+	return 0;
+}
+
+static int snd_pcm_pipewire_drain(snd_pcm_ioplug_t *io)
+{
+	int res;
+	snd_pcm_pipewire_t *pw = io->private_data;
+
+	pw_thread_loop_lock(pw->main_loop);
+	pw_log_debug("%p: drain", pw);
+	pw->drained = false;
+	pw->draining = false;
+	pipewire_start(pw);
+	while (!pw->drained && pw->error >= 0 && pw->activated) {
+		pw_thread_loop_wait(pw->main_loop);
+	}
+	res = pw->error;
+	pw_thread_loop_unlock(pw->main_loop);
+	return res;
+}
+
+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));
+	uint32_t min_period;
+
+	pw_thread_loop_lock(pw->main_loop);
+
+	snd_pcm_sw_params_alloca(&swparams);
+	if (snd_pcm_sw_params_current(io->pcm, swparams) == 0) {
+		snd_pcm_sw_params_get_avail_min(swparams, &pw->min_avail);
+		snd_pcm_sw_params_get_boundary(swparams, &pw->boundary);
+		snd_pcm_sw_params_dump(swparams, pw->output);
+		fflush(pw->log_file);
+	} else {
+		pw->min_avail = io->period_size;
+		pw->boundary = io->buffer_size;
+	}
+
+	min_period = (MIN_PERIOD * io->rate / 48000);
+	pw->min_avail = SPA_MAX(pw->min_avail, min_period);
+
+	pw_log_debug("%p: prepare error:%d stream:%p buffer-size:%lu "
+			"period-size:%lu min-avail:%ld", pw, pw->error,
+			pw->stream, io->buffer_size, io->period_size, pw->min_avail);
+
+	if (pw->error >= 0 && pw->stream != NULL && !pw->hw_params_changed)
+		goto done;
+	pw->hw_params_changed = false;
+
+	pw_properties_setf(pw->props, PW_KEY_NODE_LATENCY, "%lu/%u", pw->min_avail, io->rate);
+	pw_properties_setf(pw->props, PW_KEY_NODE_RATE, "1/%u", io->rate);
+
+	params[0] = spa_format_audio_raw_build(&b, SPA_PARAM_EnumFormat, &pw->format);
+
+	if (pw->stream != NULL) {
+		pw_stream_update_properties(pw->stream, &pw->props->dict);
+		pw_stream_update_params(pw->stream, params, 1);
+		goto done;
+	}
+
+	pw->stream = pw_stream_new(pw->core, NULL, pw_properties_copy(pw->props));
+	if (pw->stream == NULL)
+		goto error;
+
+	pw_stream_add_listener(pw->stream, &pw->stream_listener, &stream_events, pw);
+
+	pw->error = 0;
+
+	pw_stream_connect(pw->stream,
+				io->stream == SND_PCM_STREAM_PLAYBACK ?
+				PW_DIRECTION_OUTPUT :
+				PW_DIRECTION_INPUT,
+				PW_ID_ANY,
+				PW_STREAM_FLAG_AUTOCONNECT |
+				PW_STREAM_FLAG_MAP_BUFFERS |
+				PW_STREAM_FLAG_RT_PROCESS,
+				params, 1);
+
+done:
+	pw->hw_ptr = 0;
+	pw->now = 0;
+	pw->xrun_detected = false;
+	pw->drained = false;
+	pw->draining = false;
+
+	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);
+	pw_log_debug("%p: start", pw);
+	pipewire_start(pw);
+	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_log_debug("%p: stop", pw);
+	update_active(io);
+
+	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;
+}
+
+static int snd_pcm_pipewire_pause(snd_pcm_ioplug_t * io, int enable)
+{
+	pw_log_debug("%p: pause", io);
+
+	if (enable)
+		snd_pcm_pipewire_stop(io);
+	else
+		snd_pcm_pipewire_start(io);
+
+	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 8:
+		info->position[6] = SPA_AUDIO_CHANNEL_SL;
+		info->position[7] = SPA_AUDIO_CHANNEL_SR;
+		SPA_FALLTHROUGH
+	case 6:
+		info->position[5] = SPA_AUDIO_CHANNEL_LFE;
+		SPA_FALLTHROUGH
+	case 5:
+		info->position[4] = SPA_AUDIO_CHANNEL_FC;
+		SPA_FALLTHROUGH
+	case 4:
+		info->position[2] = SPA_AUDIO_CHANNEL_RL;
+		info->position[3] = SPA_AUDIO_CHANNEL_RR;
+		SPA_FALLTHROUGH
+	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;
+
+	snd_pcm_hw_params_dump(params, pw->output);
+	fflush(pw->log_file);
+
+	pw_log_debug("%p: hw_params buffer_size:%lu period_size:%lu", pw, 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);
+	if (planar) {
+		pw->blocks = io->channels;
+		pw->stride = pw->sample_bits / 8;
+	} else {
+		pw->blocks = 1;
+		pw->stride = (io->channels * pw->sample_bits) / 8;
+	}
+	pw->hw_params_changed = true;
+	pw_log_info("%p: format:%s channels:%d rate:%d stride:%d blocks:%d", pw,
+			spa_debug_type_find_name(spa_type_audio_format, pw->format.format),
+			io->channels, io->rate, pw->stride, pw->blocks);
+
+	return 0;
+}
+
+static int snd_pcm_pipewire_sw_params(snd_pcm_ioplug_t * io,
+				snd_pcm_sw_params_t * sw_params)
+{
+	snd_pcm_pipewire_t *pw = io->private_data;
+
+	pw_thread_loop_lock(pw->main_loop);
+	if (pw->stream) {
+		snd_pcm_uframes_t min_avail;
+		snd_pcm_sw_params_get_avail_min( sw_params, &min_avail);
+		snd_pcm_sw_params_get_boundary(sw_params, &pw->boundary);
+		if (min_avail != pw->min_avail) {
+			char latency[64];
+			struct spa_dict_item item[1];
+			uint32_t min_period = (MIN_PERIOD * io->rate / 48000);
+
+			pw->min_avail = SPA_MAX(min_avail, min_period);
+
+			spa_scnprintf(latency, sizeof(latency), "%lu/%u", pw->min_avail, io->rate);
+			item[0] = SPA_DICT_ITEM_INIT(PW_KEY_NODE_LATENCY, latency);
+
+			pw_log_debug("%p: sw_params update props %p %ld", pw, pw->stream, pw->min_avail);
+			pw_stream_update_properties(pw->stream, &SPA_DICT_INIT(item, 1));
+		}
+	} else {
+		pw_log_debug("%p: sw_params pre-prepare noop", pw);
+	}
+	pw_thread_loop_unlock(pw->main_loop);
+
+	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)
+{
+	SPA_FOR_EACH_ELEMENT_VAR(chmap_info, info)
+		if (info->channel == channel)
+			return info->pos;
+	return SND_CHMAP_UNKNOWN;
+}
+
+static enum spa_audio_channel chmap_to_channel(enum snd_pcm_chmap_position pos)
+{
+	if (pos >= SPA_N_ELEMENTS(chmap_info))
+		return SPA_AUDIO_CHANNEL_UNKNOWN;
+	return chmap_info[pos].channel;
+}
+
+static int snd_pcm_pipewire_set_chmap(snd_pcm_ioplug_t * io,
+				const snd_pcm_chmap_t * map)
+{
+	snd_pcm_pipewire_t *pw = io->private_data;
+	unsigned int i;
+
+	pw->format.channels = map->channels;
+	for (i = 0; i < map->channels; i++) {
+		pw->format.position[i] = chmap_to_channel(map->pos[i]);
+		pw_log_debug("map %d: %s / %s", i,
+				snd_pcm_chmap_name(map->pos[i]),
+				spa_debug_type_find_short_name(spa_type_audio_channel,
+					pw->format.position[i]));
+	}
+	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(7, 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, 4, SND_CHMAP_FL, SND_CHMAP_FR, SND_CHMAP_RL, SND_CHMAP_RR);
+	make_map(maps,  3, 5, SND_CHMAP_FL, SND_CHMAP_FR, SND_CHMAP_RL, SND_CHMAP_RR,
+			SND_CHMAP_FC);
+	make_map(maps,  4, 6, SND_CHMAP_FL, SND_CHMAP_FR, SND_CHMAP_RL, SND_CHMAP_RR,
+			SND_CHMAP_FC, SND_CHMAP_LFE);
+	make_map(maps,  5, 8, SND_CHMAP_FL, SND_CHMAP_FR, SND_CHMAP_RL, SND_CHMAP_RR,
+			SND_CHMAP_FC, SND_CHMAP_LFE, SND_CHMAP_SL, SND_CHMAP_SR);
+
+	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,
+	.pause = snd_pcm_pipewire_pause,
+	.pointer = snd_pcm_pipewire_pointer,
+	.delay = snd_pcm_pipewire_delay,
+	.drain = snd_pcm_pipewire_drain,
+	.prepare = snd_pcm_pipewire_prepare,
+	.poll_descriptors = snd_pcm_pipewire_poll_descriptors,
+	.poll_revents = snd_pcm_pipewire_poll_revents,
+	.hw_params = snd_pcm_pipewire_hw_params,
+	.sw_params = snd_pcm_pipewire_sw_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[] = {
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+		SND_PCM_FORMAT_FLOAT_LE,
+		SND_PCM_FORMAT_S32_LE,
+		SND_PCM_FORMAT_S24_LE,
+		SND_PCM_FORMAT_S24_3LE,
+		SND_PCM_FORMAT_S24_3BE,
+		SND_PCM_FORMAT_S16_LE,
+#elif __BYTE_ORDER == __BIG_ENDIAN
+		SND_PCM_FORMAT_FLOAT_BE,
+		SND_PCM_FORMAT_S32_BE,
+		SND_PCM_FORMAT_S24_BE,
+		SND_PCM_FORMAT_S24_3LE,
+		SND_PCM_FORMAT_S24_3BE,
+		SND_PCM_FORMAT_S16_BE,
+#endif
+		SND_PCM_FORMAT_U8,
+	};
+	int val;
+	int min_rate;
+	int max_rate;
+	int min_channels;
+	int max_channels;
+	int min_period_bytes;
+	int max_period_bytes;
+	int min_buffer_bytes;
+	int max_buffer_bytes;
+	const char *str;
+	snd_pcm_format_t format;
+	int err;
+
+	val = pw_properties_get_uint32(pw->props, "alsa.rate", 0);
+	if (val > 0) {
+		min_rate = max_rate = SPA_CLAMP(val, 1, MAX_RATE);
+	} else {
+		min_rate = 1;
+		max_rate = MAX_RATE;
+	}
+	val = pw_properties_get_uint32(pw->props, "alsa.channels", 0);
+	if (val > 0) {
+		min_channels = max_channels = SPA_CLAMP(val, 1, MAX_CHANNELS);
+	} else {
+		min_channels = 1;
+		max_channels = MAX_CHANNELS;
+	}
+	val = pw_properties_get_uint32(pw->props, "alsa.period-bytes", 0);
+	if (val > 0) {
+		min_period_bytes = max_period_bytes = SPA_CLAMP(val,
+				MIN_PERIOD_BYTES, MAX_PERIOD_BYTES);
+	} else {
+		min_period_bytes = MIN_PERIOD_BYTES;
+		max_period_bytes = MAX_PERIOD_BYTES;
+	}
+	val = pw_properties_get_uint32(pw->props, "alsa.buffer-bytes", 0);
+	if (val > 0) {
+		min_buffer_bytes = max_buffer_bytes = SPA_CLAMP(val,
+				MIN_BUFFER_BYTES, MAX_BUFFER_BYTES);
+	} else {
+		min_buffer_bytes = MIN_BUFFER_BYTES;
+		max_buffer_bytes = MAX_BUFFER_BYTES;
+	}
+	if (min_period_bytes * 2 > max_buffer_bytes)
+		min_period_bytes = max_period_bytes = max_buffer_bytes / 2;
+
+	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_minmax(&pw->io, SND_PCM_IOPLUG_HW_CHANNELS,
+						   min_channels, max_channels)) < 0 ||
+		(err = snd_pcm_ioplug_set_param_minmax(&pw->io, SND_PCM_IOPLUG_HW_RATE,
+						   min_rate, max_rate)) < 0 ||
+		(err = snd_pcm_ioplug_set_param_minmax(&pw->io, SND_PCM_IOPLUG_HW_BUFFER_BYTES,
+						   min_buffer_bytes,
+						   max_buffer_bytes)) < 0 ||
+		(err = snd_pcm_ioplug_set_param_minmax(&pw->io,
+						   SND_PCM_IOPLUG_HW_PERIOD_BYTES,
+						   min_period_bytes,
+						   max_period_bytes)) < 0 ||
+		(err = snd_pcm_ioplug_set_param_minmax(&pw->io, SND_PCM_IOPLUG_HW_PERIODS,
+						   MIN_BUFFERS, 1024)) < 0) {
+		pw_log_warn("Can't set param list: %s", snd_strerror(err));
+		return err;
+	}
+	format = SND_PCM_FORMAT_UNKNOWN;
+	if ((str = pw_properties_get(pw->props, "alsa.format")))
+		format = snd_pcm_format_value(str);
+
+	if (format != SND_PCM_FORMAT_UNKNOWN) {
+		err = snd_pcm_ioplug_set_param_list(&pw->io,
+				SND_PCM_IOPLUG_HW_FORMAT,
+				1, (unsigned int *)&format);
+		if (err < 0) {
+			pw_log_warn("Can't set param list: %s", snd_strerror(err));
+			return err;
+		}
+	} else {
+		err = snd_pcm_ioplug_set_param_list(&pw->io,
+				SND_PCM_IOPLUG_HW_FORMAT,
+				SPA_N_ELEMENTS(format_list),
+				format_list);
+		if (err < 0) {
+			pw_log_warn("Can't set param list: %s", snd_strerror(err));
+			return err;
+		}
+	}
+	return 0;
+}
+
+static void on_core_error(void *data, uint32_t id, int seq, int res, const char *message)
+{
+	snd_pcm_pipewire_t *pw = data;
+
+	pw_log_warn("%p: error id:%u seq:%d res:%d (%s): %s", pw,
+			id, seq, res, spa_strerror(res), message);
+
+	if (id == PW_ID_CORE) {
+		pw->error = res;
+		if (pw->fd != -1)
+			update_active(&pw->io);
+	}
+	pw_thread_loop_signal(pw->main_loop, false);
+}
+
+static const struct pw_core_events core_events = {
+	PW_VERSION_CORE_EVENTS,
+	.error = on_core_error,
+};
+
+
+static ssize_t log_write(void *cookie, const char *buf, size_t size)
+{
+	int len;
+
+	while (size > 0) {
+		len = strcspn(buf, "\n");
+		if (len > 0)
+			pw_log_debug("%.*s", (int)len, buf);
+		buf += len + 1;
+		size -= len + 1;
+	}
+	return size;
+}
+
+static cookie_io_functions_t io_funcs = {
+	.write = log_write,
+};
+
+static int execute_match(void *data, const char *location, const char *action,
+                const char *val, size_t len)
+{
+	snd_pcm_pipewire_t *pw = data;
+	if (spa_streq(action, "update-props"))
+		pw_properties_update_string(pw->props, val, len);
+	return 1;
+}
+
+static int snd_pcm_pipewire_open(snd_pcm_t **pcmp,
+		struct pw_properties *props, snd_pcm_stream_t stream, int mode)
+{
+	snd_pcm_pipewire_t *pw;
+	int err;
+	const char *str, *node_name = NULL;
+	struct pw_loop *loop;
+
+	assert(pcmp);
+	pw = calloc(1, sizeof(*pw));
+	if (!pw)
+		return -ENOMEM;
+
+	pw->props = props;
+	pw->fd = -1;
+	pw->io.poll_fd = -1;
+	pw->log_file = fopencookie(pw, "w", io_funcs);
+	if (pw->log_file == NULL) {
+		pw_log_error("can't create log file: %m");
+		err = -errno;
+		goto error;
+	}
+	if ((err = snd_output_stdio_attach(&pw->output, pw->log_file, 0)) < 0) {
+		pw_log_error("can't attach log file: %s", snd_strerror(err));
+		goto error;
+	}
+
+	pw->main_loop = pw_thread_loop_new("alsa-pipewire", NULL);
+	if (pw->main_loop == NULL) {
+		err = -errno;
+		goto error;
+	}
+	loop = pw_thread_loop_get_loop(pw->main_loop);
+	pw->system = loop->system;
+	if ((pw->context = pw_context_new(loop,
+					pw_properties_new(
+						PW_KEY_CONFIG_NAME, "client-rt.conf",
+						PW_KEY_CLIENT_API, "alsa",
+						NULL),
+					0)) == NULL) {
+		err = -errno;
+		goto error;
+	}
+
+	pw_context_conf_update_props(pw->context, "alsa.properties", pw->props);
+
+	pw_context_conf_section_match_rules(pw->context, "alsa.rules",
+			&pw_context_get_properties(pw->context)->dict, execute_match, pw);
+
+	if (pw_properties_get(pw->props, PW_KEY_APP_NAME) == NULL)
+		pw_properties_setf(pw->props, PW_KEY_APP_NAME, "PipeWire ALSA [%s]",
+				pw_get_prgname());
+	if (pw_properties_get(pw->props, PW_KEY_NODE_NAME) == NULL)
+		pw_properties_setf(pw->props, PW_KEY_NODE_NAME, "ALSA %s",
+			       stream == SND_PCM_STREAM_PLAYBACK ? "Playback" : "Capture");
+	if (pw_properties_get(pw->props, PW_KEY_MEDIA_TYPE) == NULL)
+		pw_properties_set(pw->props, PW_KEY_MEDIA_TYPE, "Audio");
+	if (pw_properties_get(pw->props, PW_KEY_MEDIA_CATEGORY) == NULL)
+		pw_properties_set(pw->props, PW_KEY_MEDIA_CATEGORY,
+				stream == SND_PCM_STREAM_PLAYBACK ?
+				"Playback" : "Capture");
+
+	str = getenv("PIPEWIRE_ALSA");
+	if (str != NULL)
+		pw_properties_update_string(pw->props, str, strlen(str));
+
+	str = getenv("PIPEWIRE_NODE");
+	if (str != NULL && str[0])
+		pw_properties_set(pw->props, PW_KEY_TARGET_OBJECT, str);
+
+	node_name = pw_properties_get(pw->props, PW_KEY_NODE_NAME);
+	if (pw_properties_get(pw->props, PW_KEY_MEDIA_NAME) == NULL)
+		pw_properties_set(pw->props, PW_KEY_MEDIA_NAME, node_name);
+
+	if ((err = pw_thread_loop_start(pw->main_loop)) < 0)
+		goto error;
+
+	pw_thread_loop_lock(pw->main_loop);
+	pw->core = pw_context_connect(pw->context, pw_properties_copy(pw->props), 0);
+	if (pw->core == NULL) {
+		err = -errno;
+		pw_thread_loop_unlock(pw->main_loop);
+		goto error;
+	}
+	pw_core_add_listener(pw->core, &pw->core_listener, &core_events, pw);
+	pw_thread_loop_unlock(pw->main_loop);
+
+	pw->fd = spa_system_eventfd_create(pw->system, SPA_FD_CLOEXEC | SPA_FD_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;
+#ifdef SND_PCM_IOPLUG_FLAG_BOUNDARY_WA
+	pw->io.flags = SND_PCM_IOPLUG_FLAG_BOUNDARY_WA;
+#else
+#warning hw_ptr updates of buffer_size will not be recognized by the ALSA library. Consider to update your ALSA library.
+#endif
+	pw->io.flags |= SND_PCM_IOPLUG_FLAG_MONOTONIC;
+
+	if ((err = snd_pcm_ioplug_create(&pw->io, node_name, stream, mode)) < 0)
+		goto error;
+
+	if ((err = pipewire_set_hw_constraint(pw)) < 0)
+		goto error;
+
+	pw_log_debug("%p: opened name:%s stream:%s mode:%d", pw, node_name,
+			snd_pcm_stream_name(pw->io.stream), mode);
+
+	*pcmp = pw->io.pcm;
+
+	return 0;
+
+error:
+	pw_log_debug("%p: failed to open %s :%s", pw, node_name, spa_strerror(err));
+	snd_pcm_pipewire_free(pw);
+	return err;
+}
+
+
+SPA_EXPORT
+SND_PCM_PLUGIN_DEFINE_FUNC(pipewire)
+{
+	snd_config_iterator_t i, next;
+	struct pw_properties *props;
+	const char *str;
+	long val;
+	int err;
+
+	pw_init(NULL, NULL);
+	if (strstr(pw_get_library_version(), "0.2") != NULL)
+		return -ENOTSUP;
+
+	props = pw_properties_new(NULL, NULL);
+	if (props == NULL)
+		return -errno;
+
+	PW_LOG_TOPIC_INIT(alsa_log_topic);
+
+	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 (spa_streq(id, "comment") || spa_streq(id, "type") || spa_streq(id, "hint"))
+			continue;
+		if (spa_streq(id, "name")) {
+			if (snd_config_get_string(n, &str) == 0)
+				pw_properties_set(props, PW_KEY_NODE_NAME, str);
+			continue;
+		}
+		if (spa_streq(id, "server")) {
+			if (snd_config_get_string(n, &str) == 0)
+				pw_properties_set(props, PW_KEY_REMOTE_NAME, str);
+			continue;
+		}
+		if (spa_streq(id, "playback_node")) {
+			if (stream == SND_PCM_STREAM_PLAYBACK &&
+			    snd_config_get_string(n, &str) == 0)
+				if (str != NULL && !spa_streq(str, "-1"))
+					pw_properties_set(props, PW_KEY_TARGET_OBJECT, str);
+			continue;
+		}
+		if (spa_streq(id, "capture_node")) {
+			if (stream == SND_PCM_STREAM_CAPTURE &&
+			    snd_config_get_string(n, &str) == 0)
+				if (str != NULL && !spa_streq(str, "-1"))
+					pw_properties_set(props, PW_KEY_TARGET_OBJECT, str);
+			continue;
+		}
+		if (spa_streq(id, "role")) {
+			if (snd_config_get_string(n, &str) == 0)
+				if (str != NULL && *str)
+					pw_properties_set(props, PW_KEY_MEDIA_ROLE, str);
+			continue;
+		}
+		if (spa_streq(id, "exclusive")) {
+			if (snd_config_get_bool(n))
+				pw_properties_set(props, PW_KEY_NODE_EXCLUSIVE, "true");
+			continue;
+		}
+		if (spa_streq(id, "rate")) {
+			if (snd_config_get_integer(n, &val) == 0) {
+				if (val != 0)
+					pw_properties_setf(props, "alsa.rate", "%ld", val);
+			} else {
+				SNDERR("%s: invalid type", id);
+			}
+			continue;
+		}
+		if (spa_streq(id, "format")) {
+			if (snd_config_get_string(n, &str) == 0) {
+				if (str != NULL && *str)
+					pw_properties_set(props, "alsa.format", str);
+			} else {
+				SNDERR("%s: invalid type", id);
+			}
+			continue;
+		}
+		if (spa_streq(id, "channels")) {
+			if (snd_config_get_integer(n, &val) == 0) {
+				if (val != 0)
+					pw_properties_setf(props, "alsa.channels", "%ld", val);
+			} else {
+				SNDERR("%s: invalid type", id);
+			}
+			continue;
+		}
+		if (spa_streq(id, "period_bytes")) {
+			if (snd_config_get_integer(n, &val) == 0) {
+				if (val != 0)
+					pw_properties_setf(props, "alsa.period-bytes", "%ld", val);
+			} else {
+				SNDERR("%s: invalid type", id);
+			}
+			continue;
+		}
+		if (spa_streq(id, "buffer_bytes")) {
+			long val;
+
+			if (snd_config_get_integer(n, &val) == 0) {
+				if (val != 0)
+					pw_properties_setf(props, "alsa.buffer-bytes", "%ld", val);
+			} else {
+				SNDERR("%s: invalid type", id);
+			}
+			continue;
+		}
+		SNDERR("Unknown field %s", id);
+		pw_properties_free(props);
+		return -EINVAL;
+	}
+
+	err = snd_pcm_pipewire_open(pcmp, props, stream, mode);
+
+	return err;
+}
+
+SPA_EXPORT
+SND_PCM_PLUGIN_SYMBOL(pipewire);