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-rw-r--r--src/output/pulse_output_plugin.c824
1 files changed, 824 insertions, 0 deletions
diff --git a/src/output/pulse_output_plugin.c b/src/output/pulse_output_plugin.c
new file mode 100644
index 000000000..a64157920
--- /dev/null
+++ b/src/output/pulse_output_plugin.c
@@ -0,0 +1,824 @@
+/*
+ * Copyright (C) 2003-2009 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "pulse_output_plugin.h"
+#include "output_api.h"
+#include "mixer_list.h"
+#include "mixer/pulse_mixer_plugin.h"
+
+#include <glib.h>
+
+#include <pulse/thread-mainloop.h>
+#include <pulse/context.h>
+#include <pulse/stream.h>
+#include <pulse/introspect.h>
+#include <pulse/subscribe.h>
+#include <pulse/error.h>
+
+#include <assert.h>
+
+#define MPD_PULSE_NAME "Music Player Daemon"
+
+/**
+ * The quark used for GError.domain.
+ */
+static inline GQuark
+pulse_output_quark(void)
+{
+ return g_quark_from_static_string("pulse_output");
+}
+
+void
+pulse_output_set_mixer(struct pulse_output *po, struct pulse_mixer *pm)
+{
+ assert(po != NULL);
+ assert(po->mixer == NULL);
+ assert(pm != NULL);
+
+ po->mixer = pm;
+
+ if (po->mainloop == NULL)
+ return;
+
+ pa_threaded_mainloop_lock(po->mainloop);
+
+ if (po->context != NULL &&
+ pa_context_get_state(po->context) == PA_CONTEXT_READY) {
+ pulse_mixer_on_connect(pm, po->context);
+
+ if (po->stream != NULL &&
+ pa_stream_get_state(po->stream) == PA_STREAM_READY)
+ pulse_mixer_on_change(pm, po->context, po->stream);
+ }
+
+ pa_threaded_mainloop_unlock(po->mainloop);
+}
+
+void
+pulse_output_clear_mixer(struct pulse_output *po, struct pulse_mixer *pm)
+{
+ assert(po != NULL);
+ assert(pm != NULL);
+ assert(po->mixer == pm);
+
+ po->mixer = NULL;
+}
+
+bool
+pulse_output_set_volume(struct pulse_output *po,
+ const struct pa_cvolume *volume, GError **error_r)
+{
+ pa_operation *o;
+
+ if (po->context == NULL || po->stream == NULL ||
+ pa_stream_get_state(po->stream) != PA_STREAM_READY) {
+ g_set_error(error_r, pulse_output_quark(), 0, "disconnected");
+ return false;
+ }
+
+ o = pa_context_set_sink_input_volume(po->context,
+ pa_stream_get_index(po->stream),
+ volume, NULL, NULL);
+ if (o == NULL) {
+ g_set_error(error_r, pulse_output_quark(), 0,
+ "failed to set PulseAudio volume: %s",
+ pa_strerror(pa_context_errno(po->context)));
+ return false;
+ }
+
+ pa_operation_unref(o);
+ return true;
+}
+
+/**
+ * \brief waits for a pulseaudio operation to finish, frees it and
+ * unlocks the mainloop
+ * \param operation the operation to wait for
+ * \return true if operation has finished normally (DONE state),
+ * false otherwise
+ */
+static bool
+pulse_wait_for_operation(struct pa_threaded_mainloop *mainloop,
+ struct pa_operation *operation)
+{
+ pa_operation_state_t state;
+
+ assert(mainloop != NULL);
+ assert(operation != NULL);
+
+ state = pa_operation_get_state(operation);
+ while (state == PA_OPERATION_RUNNING) {
+ pa_threaded_mainloop_wait(mainloop);
+ state = pa_operation_get_state(operation);
+ }
+
+ pa_operation_unref(operation);
+
+ return state == PA_OPERATION_DONE;
+}
+
+/**
+ * Callback function for stream operation. It just sends a signal to
+ * the caller thread, to wake pulse_wait_for_operation() up.
+ */
+static void
+pulse_output_stream_success_cb(G_GNUC_UNUSED pa_stream *s,
+ G_GNUC_UNUSED int success, void *userdata)
+{
+ struct pulse_output *po = userdata;
+
+ pa_threaded_mainloop_signal(po->mainloop, 0);
+}
+
+static void
+pulse_output_context_state_cb(struct pa_context *context, void *userdata)
+{
+ struct pulse_output *po = userdata;
+
+ switch (pa_context_get_state(context)) {
+ case PA_CONTEXT_READY:
+ if (po->mixer != NULL)
+ pulse_mixer_on_connect(po->mixer, context);
+
+ pa_threaded_mainloop_signal(po->mainloop, 0);
+ break;
+
+ case PA_CONTEXT_TERMINATED:
+ case PA_CONTEXT_FAILED:
+ if (po->mixer != NULL)
+ pulse_mixer_on_disconnect(po->mixer);
+
+ /* the caller thread might be waiting for these
+ states */
+ pa_threaded_mainloop_signal(po->mainloop, 0);
+ break;
+
+ case PA_CONTEXT_UNCONNECTED:
+ case PA_CONTEXT_CONNECTING:
+ case PA_CONTEXT_AUTHORIZING:
+ case PA_CONTEXT_SETTING_NAME:
+ break;
+ }
+}
+
+static void
+pulse_output_subscribe_cb(pa_context *context,
+ pa_subscription_event_type_t t,
+ uint32_t idx, void *userdata)
+{
+ struct pulse_output *po = userdata;
+ pa_subscription_event_type_t facility
+ = t & PA_SUBSCRIPTION_EVENT_FACILITY_MASK;
+ pa_subscription_event_type_t type
+ = t & PA_SUBSCRIPTION_EVENT_TYPE_MASK;
+
+ if (po->mixer != NULL &&
+ facility == PA_SUBSCRIPTION_EVENT_SINK_INPUT &&
+ po->stream != NULL &&
+ pa_stream_get_state(po->stream) == PA_STREAM_READY &&
+ idx == pa_stream_get_index(po->stream) &&
+ (type == PA_SUBSCRIPTION_EVENT_NEW ||
+ type == PA_SUBSCRIPTION_EVENT_CHANGE))
+ pulse_mixer_on_change(po->mixer, context, po->stream);
+}
+
+/**
+ * Attempt to connect asynchronously to the PulseAudio server.
+ *
+ * @return true on success, false on error
+ */
+static bool
+pulse_output_connect(struct pulse_output *po, GError **error_r)
+{
+ int error;
+
+ error = pa_context_connect(po->context, po->server,
+ (pa_context_flags_t)0, NULL);
+ if (error < 0) {
+ g_set_error(error_r, pulse_output_quark(), 0,
+ "pa_context_connect() has failed: %s",
+ pa_strerror(pa_context_errno(po->context)));
+ return false;
+ }
+
+ return true;
+}
+
+/**
+ * Create, set up and connect a context.
+ *
+ * @return true on success, false on error
+ */
+static bool
+pulse_output_setup_context(struct pulse_output *po, GError **error_r)
+{
+ po->context = pa_context_new(pa_threaded_mainloop_get_api(po->mainloop),
+ MPD_PULSE_NAME);
+ if (po->context == NULL) {
+ g_set_error(error_r, pulse_output_quark(), 0,
+ "pa_context_new() has failed");
+ return false;
+ }
+
+ pa_context_set_state_callback(po->context,
+ pulse_output_context_state_cb, po);
+ pa_context_set_subscribe_callback(po->context,
+ pulse_output_subscribe_cb, po);
+
+ if (!pulse_output_connect(po, error_r)) {
+ pa_context_unref(po->context);
+ return false;
+ }
+
+ return true;
+}
+
+/**
+ * Frees and clears the context.
+ */
+static void
+pulse_output_delete_context(struct pulse_output *po)
+{
+ pa_context_disconnect(po->context);
+ pa_context_unref(po->context);
+ po->context = NULL;
+}
+
+static void *
+pulse_output_init(G_GNUC_UNUSED const struct audio_format *audio_format,
+ const struct config_param *param,
+ G_GNUC_UNUSED GError **error_r)
+{
+ struct pulse_output *po;
+
+ g_setenv("PULSE_PROP_media.role", "music", true);
+
+ po = g_new(struct pulse_output, 1);
+ po->name = config_get_block_string(param, "name", "mpd_pulse");
+ po->server = config_get_block_string(param, "server", NULL);
+ po->sink = config_get_block_string(param, "sink", NULL);
+
+ po->mixer = NULL;
+ po->mainloop = NULL;
+ po->context = NULL;
+ po->stream = NULL;
+
+ return po;
+}
+
+static void
+pulse_output_finish(void *data)
+{
+ struct pulse_output *po = data;
+
+ g_free(po);
+}
+
+static bool
+pulse_output_enable(void *data, GError **error_r)
+{
+ struct pulse_output *po = data;
+
+ assert(po->mainloop == NULL);
+ assert(po->context == NULL);
+
+ /* create the libpulse mainloop and start the thread */
+
+ po->mainloop = pa_threaded_mainloop_new();
+ if (po->mainloop == NULL) {
+ g_free(po);
+
+ g_set_error(error_r, pulse_output_quark(), 0,
+ "pa_threaded_mainloop_new() has failed");
+ return false;
+ }
+
+ pa_threaded_mainloop_lock(po->mainloop);
+
+ if (pa_threaded_mainloop_start(po->mainloop) < 0) {
+ pa_threaded_mainloop_unlock(po->mainloop);
+ pa_threaded_mainloop_free(po->mainloop);
+ g_free(po);
+
+ g_set_error(error_r, pulse_output_quark(), 0,
+ "pa_threaded_mainloop_start() has failed");
+ return false;
+ }
+
+ pa_threaded_mainloop_unlock(po->mainloop);
+
+ /* create the libpulse context and connect it */
+
+ pa_threaded_mainloop_lock(po->mainloop);
+
+ if (!pulse_output_setup_context(po, error_r)) {
+ pa_threaded_mainloop_unlock(po->mainloop);
+ pa_threaded_mainloop_stop(po->mainloop);
+ pa_threaded_mainloop_free(po->mainloop);
+ g_free(po);
+ return false;
+ }
+
+ pa_threaded_mainloop_unlock(po->mainloop);
+
+ return true;
+}
+
+static void
+pulse_output_disable(void *data)
+{
+ struct pulse_output *po = data;
+
+ pa_threaded_mainloop_stop(po->mainloop);
+ if (po->context != NULL)
+ pulse_output_delete_context(po);
+ pa_threaded_mainloop_free(po->mainloop);
+ po->mainloop = NULL;
+}
+
+/**
+ * Check if the context is (already) connected, and waits if not. If
+ * the context has been disconnected, retry to connect.
+ *
+ * @return true on success, false on error
+ */
+static bool
+pulse_output_wait_connection(struct pulse_output *po, GError **error_r)
+{
+ pa_context_state_t state;
+
+ pa_threaded_mainloop_lock(po->mainloop);
+
+ if (po->context == NULL && !pulse_output_setup_context(po, error_r))
+ return false;
+
+ while (true) {
+ state = pa_context_get_state(po->context);
+ switch (state) {
+ case PA_CONTEXT_READY:
+ /* nothing to do */
+ pa_threaded_mainloop_unlock(po->mainloop);
+ return true;
+
+ case PA_CONTEXT_UNCONNECTED:
+ case PA_CONTEXT_TERMINATED:
+ case PA_CONTEXT_FAILED:
+ /* failure */
+ g_set_error(error_r, pulse_output_quark(), 0,
+ "failed to connect: %s",
+ pa_strerror(pa_context_errno(po->context)));
+ pulse_output_delete_context(po);
+ pa_threaded_mainloop_unlock(po->mainloop);
+ return false;
+
+ case PA_CONTEXT_CONNECTING:
+ case PA_CONTEXT_AUTHORIZING:
+ case PA_CONTEXT_SETTING_NAME:
+ /* wait some more */
+ pa_threaded_mainloop_wait(po->mainloop);
+ break;
+ }
+ }
+}
+
+static void
+pulse_output_stream_state_cb(pa_stream *stream, void *userdata)
+{
+ struct pulse_output *po = userdata;
+
+ switch (pa_stream_get_state(stream)) {
+ case PA_STREAM_READY:
+ if (po->mixer != NULL)
+ pulse_mixer_on_change(po->mixer, po->context, stream);
+
+ pa_threaded_mainloop_signal(po->mainloop, 0);
+ break;
+
+ case PA_STREAM_FAILED:
+ case PA_STREAM_TERMINATED:
+ if (po->mixer != NULL)
+ pulse_mixer_on_disconnect(po->mixer);
+
+ pa_threaded_mainloop_signal(po->mainloop, 0);
+ break;
+
+ case PA_STREAM_UNCONNECTED:
+ case PA_STREAM_CREATING:
+ break;
+ }
+}
+
+static void
+pulse_output_stream_write_cb(G_GNUC_UNUSED pa_stream *stream, size_t nbytes,
+ void *userdata)
+{
+ struct pulse_output *po = userdata;
+
+ po->writable = nbytes;
+ pa_threaded_mainloop_signal(po->mainloop, 0);
+}
+
+static bool
+pulse_output_open(void *data, struct audio_format *audio_format,
+ GError **error_r)
+{
+ struct pulse_output *po = data;
+ pa_sample_spec ss;
+ int error;
+
+ if (po->context != NULL) {
+ switch (pa_context_get_state(po->context)) {
+ case PA_CONTEXT_UNCONNECTED:
+ case PA_CONTEXT_TERMINATED:
+ case PA_CONTEXT_FAILED:
+ /* the connection was closed meanwhile; delete
+ it, and pulse_output_wait_connection() will
+ reopen it */
+ pulse_output_delete_context(po);
+ break;
+
+ case PA_CONTEXT_READY:
+ case PA_CONTEXT_CONNECTING:
+ case PA_CONTEXT_AUTHORIZING:
+ case PA_CONTEXT_SETTING_NAME:
+ break;
+ }
+ }
+
+ if (!pulse_output_wait_connection(po, error_r))
+ return false;
+
+ /* MPD doesn't support the other pulseaudio sample formats, so
+ we just force MPD to send us everything as 16 bit */
+ audio_format->format = SAMPLE_FORMAT_S16;
+
+ ss.format = PA_SAMPLE_S16NE;
+ ss.rate = audio_format->sample_rate;
+ ss.channels = audio_format->channels;
+
+ pa_threaded_mainloop_lock(po->mainloop);
+
+ /* create a stream .. */
+
+ po->stream = pa_stream_new(po->context, po->name, &ss, NULL);
+ if (po->stream == NULL) {
+ g_set_error(error_r, pulse_output_quark(), 0,
+ "pa_stream_new() has failed: %s",
+ pa_strerror(pa_context_errno(po->context)));
+ pa_threaded_mainloop_unlock(po->mainloop);
+ return false;
+ }
+
+ pa_stream_set_state_callback(po->stream,
+ pulse_output_stream_state_cb, po);
+ pa_stream_set_write_callback(po->stream,
+ pulse_output_stream_write_cb, po);
+
+ /* .. and connect it (asynchronously) */
+
+ error = pa_stream_connect_playback(po->stream, po->sink,
+ NULL, 0, NULL, NULL);
+ if (error < 0) {
+ pa_stream_unref(po->stream);
+ po->stream = NULL;
+
+ g_set_error(error_r, pulse_output_quark(), 0,
+ "pa_stream_connect_playback() has failed: %s",
+ pa_strerror(pa_context_errno(po->context)));
+ pa_threaded_mainloop_unlock(po->mainloop);
+ return false;
+ }
+
+ pa_threaded_mainloop_unlock(po->mainloop);
+
+#if !PA_CHECK_VERSION(0,9,11)
+ po->pause = false;
+#endif
+
+ return true;
+}
+
+static void
+pulse_output_close(void *data)
+{
+ struct pulse_output *po = data;
+ pa_operation *o;
+
+ pa_threaded_mainloop_lock(po->mainloop);
+
+ if (pa_stream_get_state(po->stream) == PA_STREAM_READY) {
+ o = pa_stream_drain(po->stream,
+ pulse_output_stream_success_cb, po);
+ if (o == NULL) {
+ g_warning("pa_stream_drain() has failed: %s",
+ pa_strerror(pa_context_errno(po->context)));
+ } else
+ pulse_wait_for_operation(po->mainloop, o);
+ }
+
+ pa_stream_disconnect(po->stream);
+ pa_stream_unref(po->stream);
+ po->stream = NULL;
+
+ if (po->context != NULL &&
+ pa_context_get_state(po->context) != PA_CONTEXT_READY)
+ pulse_output_delete_context(po);
+
+ pa_threaded_mainloop_unlock(po->mainloop);
+}
+
+/**
+ * Check if the stream is (already) connected, and waits for a signal
+ * if not. The mainloop must be locked before calling this function.
+ *
+ * @return the current stream state
+ */
+static pa_stream_state_t
+pulse_output_check_stream(struct pulse_output *po)
+{
+ pa_stream_state_t state = pa_stream_get_state(po->stream);
+
+ switch (state) {
+ case PA_STREAM_READY:
+ case PA_STREAM_FAILED:
+ case PA_STREAM_TERMINATED:
+ case PA_STREAM_UNCONNECTED:
+ break;
+
+ case PA_STREAM_CREATING:
+ pa_threaded_mainloop_wait(po->mainloop);
+ state = pa_stream_get_state(po->stream);
+ break;
+ }
+
+ return state;
+}
+
+/**
+ * Check if the stream is (already) connected, and waits if not. The
+ * mainloop must be locked before calling this function.
+ *
+ * @return true on success, false on error
+ */
+static bool
+pulse_output_wait_stream(struct pulse_output *po, GError **error_r)
+{
+ pa_stream_state_t state = pa_stream_get_state(po->stream);
+
+ switch (state) {
+ case PA_STREAM_READY:
+ return true;
+
+ case PA_STREAM_FAILED:
+ case PA_STREAM_TERMINATED:
+ case PA_STREAM_UNCONNECTED:
+ g_set_error(error_r, pulse_output_quark(), 0,
+ "disconnected");
+ return false;
+
+ case PA_STREAM_CREATING:
+ break;
+ }
+
+ do {
+ state = pulse_output_check_stream(po);
+ } while (state == PA_STREAM_CREATING);
+
+ if (state != PA_STREAM_READY) {
+ g_set_error(error_r, pulse_output_quark(), 0,
+ "failed to connect the stream: %s",
+ pa_strerror(pa_context_errno(po->context)));
+ return false;
+ }
+
+ return true;
+}
+
+/**
+ * Determines whether the stream is paused. On libpulse older than
+ * 0.9.11, it uses a custom pause flag.
+ */
+static bool
+pulse_output_stream_is_paused(struct pulse_output *po)
+{
+ assert(po->stream != NULL);
+
+#if !defined(PA_CHECK_VERSION) || !PA_CHECK_VERSION(0,9,11)
+ return po->pause;
+#else
+ return pa_stream_is_corked(po->stream);
+#endif
+}
+
+/**
+ * Sets cork mode on the stream.
+ */
+static bool
+pulse_output_stream_pause(struct pulse_output *po, bool pause,
+ GError **error_r)
+{
+ pa_operation *o;
+
+ assert(po->stream != NULL);
+
+ o = pa_stream_cork(po->stream, pause,
+ pulse_output_stream_success_cb, po);
+ if (o == NULL) {
+ g_set_error(error_r, pulse_output_quark(), 0,
+ "pa_stream_cork() has failed: %s",
+ pa_strerror(pa_context_errno(po->context)));
+ return false;
+ }
+
+ if (!pulse_wait_for_operation(po->mainloop, o)) {
+ g_set_error(error_r, pulse_output_quark(), 0,
+ "pa_stream_cork() has failed: %s",
+ pa_strerror(pa_context_errno(po->context)));
+ return false;
+ }
+
+#if !PA_CHECK_VERSION(0,9,11)
+ po->pause = pause;
+#endif
+ return true;
+}
+
+static size_t
+pulse_output_play(void *data, const void *chunk, size_t size, GError **error_r)
+{
+ struct pulse_output *po = data;
+ int error;
+
+ assert(po->stream != NULL);
+
+ pa_threaded_mainloop_lock(po->mainloop);
+
+ /* check if the stream is (already) connected */
+
+ if (!pulse_output_wait_stream(po, error_r)) {
+ pa_threaded_mainloop_unlock(po->mainloop);
+ return 0;
+ }
+
+ assert(po->context != NULL);
+
+ /* unpause if previously paused */
+
+ if (pulse_output_stream_is_paused(po) &&
+ !pulse_output_stream_pause(po, false, error_r))
+ return 0;
+
+ /* wait until the server allows us to write */
+
+ while (po->writable == 0) {
+ pa_threaded_mainloop_wait(po->mainloop);
+
+ if (pa_stream_get_state(po->stream) != PA_STREAM_READY) {
+ pa_threaded_mainloop_unlock(po->mainloop);
+ g_set_error(error_r, pulse_output_quark(), 0,
+ "disconnected");
+ return false;
+ }
+ }
+
+ /* now write */
+
+ if (size > po->writable)
+ /* don't send more than possible */
+ size = po->writable;
+
+ po->writable -= size;
+
+ error = pa_stream_write(po->stream, chunk, size, NULL,
+ 0, PA_SEEK_RELATIVE);
+ pa_threaded_mainloop_unlock(po->mainloop);
+ if (error < 0) {
+ g_set_error(error_r, pulse_output_quark(), error,
+ "%s", pa_strerror(error));
+ return 0;
+ }
+
+ return size;
+}
+
+static void
+pulse_output_cancel(void *data)
+{
+ struct pulse_output *po = data;
+ pa_operation *o;
+
+ assert(po->stream != NULL);
+
+ pa_threaded_mainloop_lock(po->mainloop);
+
+ if (pa_stream_get_state(po->stream) != PA_STREAM_READY) {
+ /* no need to flush when the stream isn't connected
+ yet */
+ pa_threaded_mainloop_unlock(po->mainloop);
+ return;
+ }
+
+ assert(po->context != NULL);
+
+ o = pa_stream_flush(po->stream, pulse_output_stream_success_cb, po);
+ if (o == NULL) {
+ g_warning("pa_stream_flush() has failed: %s",
+ pa_strerror(pa_context_errno(po->context)));
+ pa_threaded_mainloop_unlock(po->mainloop);
+ return;
+ }
+
+ pulse_wait_for_operation(po->mainloop, o);
+ pa_threaded_mainloop_unlock(po->mainloop);
+}
+
+static bool
+pulse_output_pause(void *data)
+{
+ struct pulse_output *po = data;
+ GError *error = NULL;
+
+ assert(po->stream != NULL);
+
+ pa_threaded_mainloop_lock(po->mainloop);
+
+ /* check if the stream is (already/still) connected */
+
+ if (!pulse_output_wait_stream(po, &error)) {
+ pa_threaded_mainloop_unlock(po->mainloop);
+ g_warning("%s", error->message);
+ g_error_free(error);
+ return false;
+ }
+
+ assert(po->context != NULL);
+
+ /* cork the stream */
+
+ if (pulse_output_stream_is_paused(po)) {
+ /* already paused; due to a MPD API limitation, we
+ have to sleep a little bit here, to avoid hogging
+ the CPU */
+
+ g_usleep(50000);
+ } else if (!pulse_output_stream_pause(po, true, &error)) {
+ pa_threaded_mainloop_unlock(po->mainloop);
+ g_warning("%s", error->message);
+ g_error_free(error);
+ return false;
+ }
+
+ pa_threaded_mainloop_unlock(po->mainloop);
+
+ return true;
+}
+
+static bool
+pulse_output_test_default_device(void)
+{
+ struct pulse_output *po;
+ bool success;
+
+ po = pulse_output_init(NULL, NULL, NULL);
+ if (po == NULL)
+ return false;
+
+ success = pulse_output_wait_connection(po, NULL);
+ pulse_output_finish(po);
+
+ return success;
+}
+
+const struct audio_output_plugin pulse_output_plugin = {
+ .name = "pulse",
+
+ .test_default_device = pulse_output_test_default_device,
+ .init = pulse_output_init,
+ .finish = pulse_output_finish,
+ .enable = pulse_output_enable,
+ .disable = pulse_output_disable,
+ .open = pulse_output_open,
+ .play = pulse_output_play,
+ .cancel = pulse_output_cancel,
+ .pause = pulse_output_pause,
+ .close = pulse_output_close,
+
+ .mixer_plugin = &pulse_mixer_plugin,
+};