diff --git a/pinos/gst/gstpinossrc.c b/pinos/gst/gstpinossrc.c
index cf39f4e73..25d677d0b 100644
--- a/pinos/gst/gstpinossrc.c
+++ b/pinos/gst/gstpinossrc.c
@@ -854,7 +854,11 @@ gst_pinos_src_create (GstPushSrc * psrc, GstBuffer ** buffer)
   }
   pinos_main_loop_unlock (pinossrc->loop);
 
-  base_time = GST_ELEMENT_CAST (psrc)->base_time;
+  if (pinossrc->is_live)
+    base_time = GST_ELEMENT_CAST (psrc)->base_time;
+  else
+    base_time = 0;
+
   pts = GST_BUFFER_PTS (*buffer);
   dts = GST_BUFFER_DTS (*buffer);
 
diff --git a/pinos/server/link.c b/pinos/server/link.c
index eb2eb9ae9..572d2d596 100644
--- a/pinos/server/link.c
+++ b/pinos/server/link.c
@@ -327,7 +327,10 @@ again:
 
   if (out_state == SPA_NODE_STATE_CONFIGURE) {
     g_debug ("link %p: doing set format on output", this);
-    if ((res = spa_node_port_set_format (this->output_node->node, this->output_port, 0, format)) < 0) {
+    if ((res = spa_node_port_set_format (this->output_node->node,
+                                         this->output_port,
+                                         SPA_PORT_FORMAT_FLAG_NEAREST,
+                                         format)) < 0) {
       g_set_error (&error,
                    PINOS_ERROR,
                    PINOS_ERROR_FORMAT_NEGOTIATION,
@@ -336,7 +339,10 @@ again:
     }
   } else if (in_state == SPA_NODE_STATE_CONFIGURE) {
     g_debug ("link %p: doing set format on input", this);
-    if ((res = spa_node_port_set_format (this->input_node->node, this->input_port, 0, format)) < 0) {
+    if ((res = spa_node_port_set_format (this->input_node->node,
+                                         this->input_port,
+                                         SPA_PORT_FORMAT_FLAG_NEAREST,
+                                         format)) < 0) {
       g_set_error (&error,
                    PINOS_ERROR,
                    PINOS_ERROR_FORMAT_NEGOTIATION,
diff --git a/spa/include/spa/defs.h b/spa/include/spa/defs.h
index c9c7d2be9..beb1bc16f 100644
--- a/spa/include/spa/defs.h
+++ b/spa/include/spa/defs.h
@@ -76,10 +76,17 @@ typedef void (*SpaNotify) (void *data);
 #define SPA_PTR_TO_UINT32(p) ((uint32_t) ((uintptr_t) (p)))
 #define SPA_UINT32_TO_PTR(u) ((void*) ((uintptr_t) (u)))
 
-#define SPA_TIME_INVALID  ((uint64_t)-1)
+#define SPA_TIME_INVALID  ((int64_t)INT64_MIN)
 #define SPA_IDX_INVALID  ((unsigned int)-1)
 #define SPA_ID_INVALID  ((uint32_t)0xffffffff)
 
+#define SPA_NSEC_PER_SEC (1000000000ll)
+#define SPA_USEC_PER_SEC (1000000ll)
+#define SPA_MSEC_PER_SEC (1000ll)
+
+#define SPA_TIMESPEC_TO_TIME(ts) ((ts)->tv_sec * SPA_NSEC_PER_SEC + (ts)->tv_nsec)
+#define SPA_TIMEVAL_TO_TIME(tv)  ((tv)->tv_sec * SPA_NSEC_PER_SEC + (tv)->tv_usec * 1000ll)
+
 
 #ifdef __cplusplus
 }  /* extern "C" */
diff --git a/spa/lib/audio-raw.c b/spa/lib/audio-raw.c
index 51acfb06f..73ee1e6bb 100644
--- a/spa/lib/audio-raw.c
+++ b/spa/lib/audio-raw.c
@@ -223,7 +223,7 @@ spa_format_audio_init (SpaMediaType     type,
         SPA_AUDIO_FORMAT_S16,
         SPA_AUDIO_FLAG_NONE,
         SPA_AUDIO_LAYOUT_INTERLEAVED,
-        32000,
+        44100,
         2,
         0
       };
diff --git a/spa/plugins/alsa/alsa-monitor.c b/spa/plugins/alsa/alsa-monitor.c
new file mode 100644
index 000000000..cc30e5951
--- /dev/null
+++ b/spa/plugins/alsa/alsa-monitor.c
@@ -0,0 +1,437 @@
+/* Spa ALSA Monitor
+ * Copyright (C) 2016 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 Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include <stddef.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <poll.h>
+
+#include <libudev.h>
+
+#include <spa/poll.h>
+#include <spa/monitor.h>
+#include <spa/memory.h>
+#include <spa/debug.h>
+
+extern const SpaHandleFactory spa_alsa_source_factory;
+
+typedef struct _SpaALSAMonitor SpaALSAMonitor;
+
+typedef struct {
+  SpaMonitorItem item;
+  struct udev_device *udevice;
+  SpaDict     info;
+  SpaDictItem info_items[32];
+} ALSAItem;
+
+struct _SpaALSAMonitor {
+  SpaHandle handle;
+  SpaMonitor monitor;
+
+  SpaMonitorEventCallback event_cb;
+  void *user_data;
+
+  struct udev* udev;
+  struct udev_monitor *umonitor;
+  struct udev_enumerate *enumerate;
+
+  ALSAItem uitem;
+
+  int fd;
+  SpaPollFd fds[1];
+  SpaPollItem poll;
+};
+
+static SpaResult
+alsa_udev_open (SpaALSAMonitor *this)
+{
+  if (this->udev != NULL)
+    return SPA_RESULT_OK;
+
+  this->udev = udev_new ();
+
+  return SPA_RESULT_OK;
+}
+
+static const char *
+path_get_card_id (const char *path)
+{
+  const char *e;
+
+  if (!path)
+    return NULL;
+
+  if (!(e = strrchr(path, '/')))
+    return NULL;
+
+  if (strlen (e) <= 5 || strncmp (e, "/card", 5) != 0)
+    return NULL;
+
+  return e + 5;
+}
+
+static int
+fill_item (ALSAItem *item, struct udev_device *udevice)
+{
+  unsigned int i;
+  const char *str;
+
+  if (item->udevice)
+    udev_device_unref (item->udevice);
+  item->udevice = udevice;
+  if (udevice == NULL)
+    return -1;
+
+  if (udev_device_get_property_value (udevice, "PULSE_IGNORE"))
+    return -1;
+
+  if ((str = udev_device_get_property_value (udevice, "SOUND_CLASS")) &&
+      strcmp (str, "modem") == 0)
+    return -1;
+
+  if ((str = path_get_card_id (udev_device_get_property_value (udevice, "DEVPATH"))) == NULL)
+    return -1;
+
+  item->item.id = udev_device_get_syspath (item->udevice);
+  item->item.flags = 0;
+  item->item.state = SPA_MONITOR_ITEM_STATE_AVAILABLE;
+  item->item.klass = "Audio/Device";
+  item->item.info = &item->info;
+  item->item.factory = &spa_alsa_source_factory;
+
+  item->info.items = item->info_items;
+  i = 0;
+  item->info_items[i].key = "alsa.card";
+  item->info_items[i++].value = str;
+  item->info_items[i].key = "udev-probed";
+  item->info_items[i++].value = "1";
+  item->info_items[i].key = "device.api";
+  item->info_items[i++].value = "alsa";
+
+  if ((str = udev_device_get_property_value (udevice, "SOUND_CLASS")) && *str) {
+    item->info_items[i].key = "device.class";
+    item->info_items[i++].value = str;
+  }
+
+  str = udev_device_get_property_value (item->udevice, "ID_PATH");
+  if (!(str && *str))
+    str = udev_device_get_syspath (item->udevice);
+  if (str && *str) {
+    item->info_items[i].key = "device.bus_path";
+    item->info_items[i++].value = str;
+  }
+  if ((str = udev_device_get_syspath (item->udevice)) && *str) {
+    item->info_items[i].key = "sysfs.path";
+    item->info_items[i++].value = str;
+  }
+  if ((str = udev_device_get_property_value (item->udevice, "ID_ID")) && *str) {
+    item->info_items[i].key = "udev.id";
+    item->info_items[i++].value = str;
+  }
+  if ((str = udev_device_get_property_value (item->udevice, "ID_BUS")) && *str) {
+    item->info_items[i].key = "device.bus";
+    item->info_items[i++].value = str;
+  }
+  if ((str = udev_device_get_property_value (item->udevice, "SUBSYSTEM")) && *str) {
+    item->info_items[i].key = "device.subsystem";
+    item->info_items[i++].value = str;
+  }
+  if ((str = udev_device_get_property_value (item->udevice, "ID_VENDOR_ID")) && *str) {
+    item->info_items[i].key = "device.vendor.id";
+    item->info_items[i++].value = str;
+  }
+  str = udev_device_get_property_value (item->udevice, "ID_VENDOR_FROM_DATABASE");
+  if (!(str && *str)) {
+    str = udev_device_get_property_value (item->udevice, "ID_VENDOR_ENC");
+    if (!(str && *str)) {
+      str = udev_device_get_property_value (item->udevice, "ID_VENDOR");
+    }
+  }
+  if (str && *str) {
+    item->info_items[i].key = "device.vendor.name";
+    item->info_items[i++].value = str;
+  }
+  if ((str = udev_device_get_property_value (item->udevice, "ID_MODEL_ID")) && *str) {
+    item->info_items[i].key = "device.product.id";
+    item->info_items[i++].value = str;
+  }
+  str = udev_device_get_property_value (item->udevice, "ID_V4L_PRODUCT");
+  if (!(str && *str)) {
+    str = udev_device_get_property_value (item->udevice, "ID_MODEL_FROM_DATABASE");
+    if (!(str && *str)) {
+      str = udev_device_get_property_value (item->udevice, "ID_MODEL_ENC");
+      if (!(str && *str)) {
+        str = udev_device_get_property_value (item->udevice, "ID_MODEL");
+      }
+    }
+  }
+  if (str && *str) {
+    item->info_items[i].key = "device.product.name";
+    item->info_items[i++].value = str;
+    item->item.name = str;
+  } else {
+    item->item.name = "Unknown";
+  }
+  if ((str = udev_device_get_property_value (item->udevice, "ID_SERIAL")) && *str) {
+    item->info_items[i].key = "device.serial";
+    item->info_items[i++].value = str;
+  }
+  if ((str = udev_device_get_property_value (item->udevice, "ID_V4L_CAPABILITIES")) && *str) {
+    item->info_items[i].key = "device.capabilities";
+    item->info_items[i++].value = str;
+  }
+  item->info.n_items = i;
+
+  return 0;
+}
+
+static int
+alsa_on_fd_events (SpaPollNotifyData *data)
+{
+  SpaALSAMonitor *this = data->user_data;
+  struct udev_device *dev;
+  const char *str;
+  SpaMonitorEvent event;
+
+  dev = udev_monitor_receive_device (this->umonitor);
+  if (fill_item (&this->uitem, dev) < 0)
+    return 0;
+
+  if ((str = udev_device_get_action (dev)) == NULL)
+    str = "change";
+
+  if (strcmp (str, "add") == 0) {
+    event.type = SPA_MONITOR_EVENT_TYPE_ADDED;
+  } else if (strcmp (str, "change") == 0) {
+    event.type = SPA_MONITOR_EVENT_TYPE_CHANGED;
+  } else if (strcmp (str, "remove") == 0) {
+    event.type = SPA_MONITOR_EVENT_TYPE_REMOVED;
+  }
+  event.data = &this->uitem.item;
+  event.size = sizeof (this->uitem);
+  this->event_cb (&this->monitor, &event, this->user_data);
+
+  return 0;
+}
+
+static SpaResult
+spa_alsa_monitor_set_event_callback (SpaMonitor              *monitor,
+                                     SpaMonitorEventCallback  callback,
+                                     void                    *user_data)
+{
+  SpaResult res;
+  SpaALSAMonitor *this;
+  SpaMonitorEvent event;
+
+  if (monitor == NULL || monitor->handle == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this = (SpaALSAMonitor *) monitor->handle;
+
+  this->event_cb = callback;
+  this->user_data = user_data;
+
+  if (callback) {
+    if ((res = alsa_udev_open (this)) < 0)
+      return res;
+
+    this->umonitor = udev_monitor_new_from_netlink (this->udev, "udev");
+    if (!this->umonitor)
+      return SPA_RESULT_ERROR;
+
+    udev_monitor_filter_add_match_subsystem_devtype (this->umonitor,
+                                                     "video4linux",
+                                                     NULL);
+
+    udev_monitor_enable_receiving (this->umonitor);
+    this->fd = udev_monitor_get_fd (this->umonitor);;
+
+    event.type = SPA_MONITOR_EVENT_TYPE_ADD_POLL;
+    event.data = &this->poll;
+    event.size = sizeof (this->poll);
+
+    this->fds[0].fd = this->fd;
+    this->fds[0].events = POLLIN | POLLPRI | POLLERR;
+    this->fds[0].revents = 0;
+
+    this->poll.id = 0;
+    this->poll.enabled = true;
+    this->poll.fds = this->fds;
+    this->poll.n_fds = 1;
+    this->poll.idle_cb = NULL;
+    this->poll.before_cb = NULL;
+    this->poll.after_cb = alsa_on_fd_events;
+    this->poll.user_data = this;
+    this->event_cb (&this->monitor, &event, this->user_data);
+  } else {
+    event.type = SPA_MONITOR_EVENT_TYPE_REMOVE_POLL;
+    event.data = &this->poll;
+    event.size = sizeof (this->poll);
+    this->event_cb (&this->monitor, &event, this->user_data);
+  }
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_alsa_monitor_enum_items (SpaMonitor       *monitor,
+                             SpaMonitorItem  **item,
+                             void            **state)
+{
+  SpaResult res;
+  SpaALSAMonitor *this;
+  struct udev_list_entry *devices;
+  struct udev_device *dev;
+
+  if (monitor == NULL || monitor->handle == NULL || item == NULL || state == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this = (SpaALSAMonitor *) monitor->handle;
+
+  if ((res = alsa_udev_open (this)) < 0)
+    return res;
+
+again:
+  if (*state == NULL) {
+    if (this->enumerate)
+      udev_enumerate_unref (this->enumerate);
+    this->enumerate = udev_enumerate_new (this->udev);
+
+    udev_enumerate_add_match_subsystem (this->enumerate, "sound");
+    udev_enumerate_scan_devices (this->enumerate);
+
+    devices = udev_enumerate_get_list_entry (this->enumerate);
+    if (devices == NULL)
+      return SPA_RESULT_ENUM_END;
+  } else {
+    devices = *state;
+  }
+
+  if (*state == (void*)1) {
+    fill_item (&this->uitem, NULL);
+    return SPA_RESULT_ENUM_END;
+  }
+
+  dev = udev_device_new_from_syspath (this->udev,
+                                      udev_list_entry_get_name (devices));
+
+  if ((*state = udev_list_entry_get_next (devices)) == NULL)
+    *state = (void*)1;
+
+  if (fill_item (&this->uitem, dev) < 0)
+    goto again;
+
+  *item = &this->uitem.item;
+
+  return SPA_RESULT_OK;
+}
+
+static const SpaMonitor alsamonitor = {
+  NULL,
+  NULL,
+  sizeof (SpaMonitor),
+  spa_alsa_monitor_set_event_callback,
+  spa_alsa_monitor_enum_items,
+};
+
+static SpaResult
+spa_alsa_monitor_get_interface (SpaHandle               *handle,
+                                uint32_t                 interface_id,
+                                void                   **interface)
+{
+  SpaALSAMonitor *this;
+
+  if (handle == NULL || interface == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this = (SpaALSAMonitor *) handle;
+
+  switch (interface_id) {
+    case SPA_INTERFACE_ID_MONITOR:
+      *interface = &this->monitor;
+      break;
+    default:
+      return SPA_RESULT_UNKNOWN_INTERFACE;
+  }
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+alsa_monitor_clear (SpaHandle *handle)
+{
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+alsa_monitor_init (const SpaHandleFactory  *factory,
+                   SpaHandle               *handle,
+                   const SpaDict           *info)
+{
+  SpaALSAMonitor *this;
+
+  if (factory == NULL || handle == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  handle->get_interface = spa_alsa_monitor_get_interface;
+  handle->clear = alsa_monitor_clear,
+
+  this = (SpaALSAMonitor *) handle;
+  this->monitor = alsamonitor;
+  this->monitor.handle = handle;
+
+  return SPA_RESULT_OK;
+}
+
+static const SpaInterfaceInfo alsa_monitor_interfaces[] =
+{
+  { SPA_INTERFACE_ID_MONITOR,
+    SPA_INTERFACE_ID_MONITOR_NAME,
+    SPA_INTERFACE_ID_MONITOR_DESCRIPTION,
+  },
+};
+
+static SpaResult
+alsa_monitor_enum_interface_info (const SpaHandleFactory  *factory,
+                                  const SpaInterfaceInfo **info,
+                                  void                   **state)
+{
+  int index;
+
+  if (factory == NULL || info == NULL || state == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  index = (*state == NULL ? 0 : *(int*)state);
+
+  if (index < 0 || index >= SPA_N_ELEMENTS (alsa_monitor_interfaces))
+    return SPA_RESULT_ENUM_END;
+
+  *info = &alsa_monitor_interfaces[index];
+  *(int*)state = ++index;
+  return SPA_RESULT_OK;
+}
+
+const SpaHandleFactory spa_alsa_monitor_factory =
+{ "alsa-monitor",
+  NULL,
+  sizeof (SpaALSAMonitor),
+  alsa_monitor_init,
+  alsa_monitor_enum_interface_info,
+};
diff --git a/spa/plugins/alsa/alsa-source.c b/spa/plugins/alsa/alsa-source.c
new file mode 100644
index 000000000..e2baccff4
--- /dev/null
+++ b/spa/plugins/alsa/alsa-source.c
@@ -0,0 +1,819 @@
+/* Spa ALSA Source
+ * Copyright (C) 2016 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 Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include <stddef.h>
+
+#include <asoundlib.h>
+
+#include <spa/node.h>
+#include <spa/queue.h>
+#include <spa/audio/format.h>
+
+#include "alsa-utils.h"
+
+typedef struct _SpaALSAState SpaALSASource;
+
+static void
+update_state (SpaALSASource *this, SpaNodeState state)
+{
+  SpaNodeEvent event;
+  SpaNodeEventStateChange sc;
+
+  if (this->node.state == state)
+    return;
+
+  this->node.state = state;
+
+  event.type = SPA_NODE_EVENT_TYPE_STATE_CHANGE;
+  event.data = &sc;
+  event.size = sizeof (sc);
+  sc.state = state;
+  this->event_cb (&this->node, &event, this->user_data);
+}
+
+static const char default_device[] = "hw:0";
+static const uint32_t default_buffer_time = 1000;
+static const uint32_t default_period_time = 100;
+static const bool default_period_event = 0;
+
+static void
+reset_alsa_props (SpaALSAProps *props)
+{
+  strncpy (props->device, default_device, 64);
+  props->buffer_time = default_buffer_time;
+  props->period_time = default_period_time;
+  props->period_event = default_period_event;
+  props->props.unset_mask = 0xf;
+}
+
+static const uint32_t min_uint32 = 1;
+static const uint32_t max_uint32 = UINT32_MAX;
+
+static const SpaPropRangeInfo uint32_range[] = {
+  { "min", "Minimum value", { 4, &min_uint32 } },
+  { "max", "Maximum value", { 4, &max_uint32 } },
+};
+
+enum {
+  PROP_ID_DEVICE,
+  PROP_ID_DEVICE_NAME,
+  PROP_ID_CARD_NAME,
+  PROP_ID_BUFFER_TIME,
+  PROP_ID_PERIOD_TIME,
+  PROP_ID_PERIOD_EVENT,
+  PROP_ID_LAST,
+};
+
+static const SpaPropInfo prop_info[] =
+{
+  { PROP_ID_DEVICE,             offsetof (SpaALSAProps, device),
+                                "device", "ALSA device, as defined in an asound configuration file",
+                                SPA_PROP_FLAG_READWRITE,
+                                SPA_PROP_TYPE_STRING, 63,
+                                SPA_PROP_RANGE_TYPE_NONE, 0, NULL,
+                                NULL },
+  { PROP_ID_DEVICE_NAME,        offsetof (SpaALSAProps, device_name),
+                                "device-name", "Human-readable name of the sound device",
+                                SPA_PROP_FLAG_READABLE,
+                                SPA_PROP_TYPE_STRING, 127,
+                                SPA_PROP_RANGE_TYPE_NONE, 0, NULL,
+                                NULL },
+  { PROP_ID_CARD_NAME,          offsetof (SpaALSAProps, card_name),
+                                "card-name", "Human-readable name of the sound card",
+                                SPA_PROP_FLAG_READABLE,
+                                SPA_PROP_TYPE_STRING, 127,
+                                SPA_PROP_RANGE_TYPE_NONE, 0, NULL,
+                                NULL },
+  { PROP_ID_BUFFER_TIME,        offsetof (SpaALSAProps, buffer_time),
+                                "buffer-time", "The total size of the buffer in time",
+                                SPA_PROP_FLAG_READWRITE,
+                                SPA_PROP_TYPE_UINT32, sizeof (uint32_t),
+                                SPA_PROP_RANGE_TYPE_MIN_MAX, 2, uint32_range,
+                                NULL },
+  { PROP_ID_PERIOD_TIME,        offsetof (SpaALSAProps, period_time),
+                                "period-time", "The size of a period in time",
+                                SPA_PROP_FLAG_READWRITE,
+                                SPA_PROP_TYPE_UINT32, sizeof (uint32_t),
+                                SPA_PROP_RANGE_TYPE_MIN_MAX, 2, uint32_range,
+                                NULL },
+  { PROP_ID_PERIOD_EVENT,       offsetof (SpaALSAProps, period_event),
+                                "period-event", "Generate an event each period",
+                                SPA_PROP_FLAG_READWRITE,
+                                SPA_PROP_TYPE_BOOL, sizeof (bool),
+                                SPA_PROP_RANGE_TYPE_NONE, 0, NULL,
+                                NULL },
+};
+
+static SpaResult
+spa_alsa_source_node_get_props (SpaNode       *node,
+                                SpaProps     **props)
+{
+  SpaALSASource *this;
+
+  if (node == NULL || node->handle == NULL || props == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this = (SpaALSASource *) node->handle;
+
+  memcpy (&this->props[0], &this->props[1], sizeof (this->props[1]));
+  *props = &this->props[0].props;
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_alsa_source_node_set_props (SpaNode         *node,
+                              const SpaProps  *props)
+{
+  SpaALSASource *this;
+  SpaALSAProps *p;
+  SpaResult res;
+
+  if (node == NULL || node->handle == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this = (SpaALSASource *) node->handle;
+  p = &this->props[1];
+
+  if (props == NULL) {
+    reset_alsa_props (p);
+    return SPA_RESULT_OK;
+  }
+
+  res = spa_props_copy (props, &p->props);
+
+  return res;
+}
+
+static SpaResult
+spa_alsa_source_node_send_command (SpaNode        *node,
+                                 SpaNodeCommand *command)
+{
+  SpaALSASource *this;
+
+  if (node == NULL || node->handle == NULL || command == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this = (SpaALSASource *) node->handle;
+
+  switch (command->type) {
+    case SPA_NODE_COMMAND_INVALID:
+      return SPA_RESULT_INVALID_COMMAND;
+
+    case SPA_NODE_COMMAND_START:
+      if (spa_alsa_start (this) < 0)
+        return SPA_RESULT_ERROR;
+
+      update_state (this, SPA_NODE_STATE_STREAMING);
+      break;
+    case SPA_NODE_COMMAND_PAUSE:
+      if (spa_alsa_stop (this) < 0)
+        return SPA_RESULT_ERROR;
+
+      update_state (this, SPA_NODE_STATE_PAUSED);
+      break;
+    case SPA_NODE_COMMAND_FLUSH:
+    case SPA_NODE_COMMAND_DRAIN:
+    case SPA_NODE_COMMAND_MARKER:
+    case SPA_NODE_COMMAND_CLOCK_UPDATE:
+      return SPA_RESULT_NOT_IMPLEMENTED;
+  }
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_alsa_source_node_set_event_callback (SpaNode              *node,
+                                       SpaNodeEventCallback  event,
+                                       void                 *user_data)
+{
+  SpaALSASource *this;
+
+  if (node == NULL || node->handle == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this = (SpaALSASource *) node->handle;
+
+  this->event_cb = event;
+  this->user_data = user_data;
+
+  update_state (this, SPA_NODE_STATE_CONFIGURE);
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_alsa_source_node_get_n_ports (SpaNode       *node,
+                                unsigned int  *n_input_ports,
+                                unsigned int  *max_input_ports,
+                                unsigned int  *n_output_ports,
+                                unsigned int  *max_output_ports)
+{
+  if (node == NULL || node->handle == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  if (n_input_ports)
+    *n_input_ports = 0;
+  if (max_input_ports)
+    *max_input_ports = 0;
+  if (n_output_ports)
+    *n_output_ports = 1;
+  if (max_output_ports)
+    *max_output_ports = 1;
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_alsa_source_node_get_port_ids (SpaNode       *node,
+                                   unsigned int   n_input_ports,
+                                   uint32_t      *input_ids,
+                                   unsigned int   n_output_ports,
+                                   uint32_t      *output_ids)
+{
+  if (node == NULL || node->handle == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  if (n_output_ports > 0 && output_ids != NULL)
+    output_ids[0] = 0;
+
+  return SPA_RESULT_OK;
+}
+
+
+static SpaResult
+spa_alsa_source_node_add_port (SpaNode        *node,
+                             uint32_t        port_id)
+{
+  return SPA_RESULT_NOT_IMPLEMENTED;
+}
+
+static SpaResult
+spa_alsa_source_node_remove_port (SpaNode        *node,
+                                uint32_t        port_id)
+{
+  return SPA_RESULT_NOT_IMPLEMENTED;
+}
+
+static SpaResult
+spa_alsa_source_node_port_enum_formats (SpaNode         *node,
+                                        uint32_t         port_id,
+                                        SpaFormat      **format,
+                                        const SpaFormat *filter,
+                                        void           **state)
+{
+  SpaALSASource *this;
+  int index;
+
+  if (node == NULL || node->handle == NULL || format == NULL || state == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this = (SpaALSASource *) node->handle;
+
+  if (port_id != 0)
+    return SPA_RESULT_INVALID_PORT;
+
+  index = (*state == NULL ? 0 : *(int*)state);
+
+  switch (index) {
+    case 0:
+      spa_format_audio_init (SPA_MEDIA_TYPE_AUDIO,
+                             SPA_MEDIA_SUBTYPE_RAW,
+                             &this->query_format);
+      break;
+    case 1:
+      spa_format_audio_init (SPA_MEDIA_TYPE_AUDIO,
+                             SPA_MEDIA_SUBTYPE_AAC,
+                             &this->query_format);
+      break;
+    default:
+      return SPA_RESULT_ENUM_END;
+  }
+  *format = &this->query_format.format;
+  *(int*)state = ++index;
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_alsa_source_node_port_set_format (SpaNode            *node,
+                                      uint32_t            port_id,
+                                      SpaPortFormatFlags  flags,
+                                      const SpaFormat    *format)
+{
+  SpaALSASource *this;
+  SpaResult res;
+
+  if (node == NULL || node->handle == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this = (SpaALSASource *) node->handle;
+
+  if (port_id != 0)
+    return SPA_RESULT_INVALID_PORT;
+
+  if (format == NULL) {
+    this->have_format = false;
+    update_state (this, SPA_NODE_STATE_CONFIGURE);
+    return SPA_RESULT_OK;
+  }
+
+  if ((res = spa_format_audio_parse (format, &this->current_format)) < 0)
+    return res;
+
+  if (spa_alsa_set_format (this, &this->current_format, flags) < 0)
+    return SPA_RESULT_ERROR;
+
+  this->info.flags = SPA_PORT_INFO_FLAG_CAN_ALLOC_BUFFERS |
+                     SPA_PORT_INFO_FLAG_LIVE;
+  this->info.maxbuffering = this->buffer_frames * this->frame_size;
+  this->info.latency = (this->period_frames * SPA_NSEC_PER_SEC) / this->rate;
+  this->info.n_params = 1;
+  this->info.params = this->params;
+  this->params[0] = &this->param_buffers.param;
+  this->param_buffers.param.type = SPA_ALLOC_PARAM_TYPE_BUFFERS;
+  this->param_buffers.param.size = sizeof (this->param_buffers);
+  this->param_buffers.minsize = this->period_frames * this->frame_size;
+  this->param_buffers.stride = 0;
+  this->param_buffers.min_buffers = 1;
+  this->param_buffers.max_buffers = 16;
+  this->param_buffers.align = 16;
+  this->info.features = NULL;
+
+  this->have_format = true;
+
+  update_state (this, SPA_NODE_STATE_READY);
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_alsa_source_node_port_get_format (SpaNode          *node,
+                                    uint32_t          port_id,
+                                    const SpaFormat **format)
+{
+  SpaALSASource *this;
+
+  if (node == NULL || node->handle == NULL || format == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this = (SpaALSASource *) node->handle;
+
+  if (port_id != 0)
+    return SPA_RESULT_INVALID_PORT;
+
+  if (!this->have_format)
+    return SPA_RESULT_NO_FORMAT;
+
+  *format = &this->current_format.format;
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_alsa_source_node_port_get_info (SpaNode            *node,
+                                  uint32_t            port_id,
+                                  const SpaPortInfo **info)
+{
+  SpaALSASource *this;
+
+  if (node == NULL || node->handle == NULL || info == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this = (SpaALSASource *) node->handle;
+
+  if (port_id != 0)
+    return SPA_RESULT_INVALID_PORT;
+
+  *info = &this->info;
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_alsa_source_node_port_get_props (SpaNode    *node,
+                                   uint32_t    port_id,
+                                   SpaProps  **props)
+{
+  return SPA_RESULT_NOT_IMPLEMENTED;
+}
+
+static SpaResult
+spa_alsa_source_node_port_set_props (SpaNode         *node,
+                                   uint32_t         port_id,
+                                   const SpaProps  *props)
+{
+  return SPA_RESULT_NOT_IMPLEMENTED;
+}
+
+static SpaResult
+spa_alsa_source_node_port_use_buffers (SpaNode         *node,
+                                     uint32_t         port_id,
+                                     SpaBuffer      **buffers,
+                                     uint32_t         n_buffers)
+{
+  return SPA_RESULT_NOT_IMPLEMENTED;
+}
+
+static void
+recycle_buffer (SpaALSASource *this, uint32_t buffer_id)
+{
+  SpaALSABuffer *b;
+
+  b = &this->alloc_buffers[buffer_id];
+  if (!b->outstanding)
+    return;
+
+  b->outstanding = false;
+  SPA_QUEUE_PUSH_TAIL (&this->free, SpaALSABuffer, next, b);
+}
+
+static SpaResult
+spa_alsa_source_node_port_alloc_buffers (SpaNode         *node,
+                                         uint32_t         port_id,
+                                         SpaAllocParam  **params,
+                                         uint32_t         n_params,
+                                         SpaBuffer      **buffers,
+                                         uint32_t        *n_buffers)
+{
+  SpaALSASource *this;
+  SpaALSABuffer *b;
+  unsigned int i, n_bufs;
+  uint8_t *bufmem;
+  size_t buffer_size;
+
+  if (node == NULL || node->handle == NULL || buffers == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  if (port_id != 0)
+    return SPA_RESULT_INVALID_PORT;
+
+  this = (SpaALSASource *) node->handle;
+
+  if (!this->have_format)
+    return SPA_RESULT_NO_FORMAT;
+
+  n_bufs = *n_buffers;
+
+  SPA_QUEUE_INIT (&this->free);
+  SPA_QUEUE_INIT (&this->ready);
+
+  buffer_size = this->buffer_frames * this->frame_size;
+
+  if (!this->alloc_bufmem)
+    this->alloc_bufmem = spa_memory_alloc_with_fd (SPA_MEMORY_POOL_SHARED,
+                                                   NULL,
+                                                   buffer_size * n_bufs);
+  bufmem = spa_memory_ensure_ptr (this->alloc_bufmem);
+
+  if (!this->alloc_mem)
+    this->alloc_mem = spa_memory_alloc_with_fd (SPA_MEMORY_POOL_SHARED, NULL, sizeof (SpaALSABuffer) * n_bufs);
+  this->alloc_buffers = spa_memory_ensure_ptr (this->alloc_mem);
+  this->n_buffers = n_bufs;
+
+  for (i = 0; i < n_bufs; i++) {
+    b = &this->alloc_buffers[i];
+    b->buffer.id = i;
+    b->buffer.mem.mem = this->alloc_mem->mem;
+    b->buffer.mem.offset = sizeof (SpaALSABuffer) * i;
+    b->buffer.mem.size = sizeof (SpaALSABuffer);
+
+    b->buffer.n_metas = 2;
+    b->buffer.metas = offsetof (SpaALSABuffer, metas);
+    b->buffer.n_datas = 1;
+    b->buffer.datas = offsetof (SpaALSABuffer, datas);
+
+    b->header.flags = 0;
+    b->header.seq = 0;
+    b->header.pts = 0;
+    b->header.dts_offset = 0;
+
+    b->metas[0].type = SPA_META_TYPE_HEADER;
+    b->metas[0].offset = offsetof (SpaALSABuffer, header);
+    b->metas[0].size = sizeof (b->header);
+
+    b->ringbuffer.readindex = 0;
+    b->ringbuffer.writeindex = 0;
+    b->ringbuffer.size = 0;
+    b->ringbuffer.size_mask = 0;
+
+    b->metas[1].type = SPA_META_TYPE_RINGBUFFER;
+    b->metas[1].offset = offsetof (SpaALSABuffer, ringbuffer);
+    b->metas[1].size = sizeof (b->ringbuffer);
+
+    b->datas[0].mem.mem = this->alloc_bufmem->mem;
+    b->datas[0].mem.offset = buffer_size * i;
+    b->datas[0].mem.size = buffer_size;
+    b->datas[0].stride = 0;
+    b->ptr = bufmem + buffer_size * i;
+
+    buffers[i] = b->outbuf = &b->buffer;
+
+    b->outstanding = true;
+    recycle_buffer (this, b->outbuf->id);
+  }
+  *n_buffers = n_bufs;
+
+  this->have_buffers = true;
+
+  update_state (this, SPA_NODE_STATE_PAUSED);
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_alsa_source_node_port_reuse_buffer (SpaNode         *node,
+                                        uint32_t         port_id,
+                                        uint32_t         buffer_id)
+{
+  SpaALSASource *this;
+
+  if (node == NULL || node->handle == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this = (SpaALSASource *) node->handle;
+
+  if (port_id != 0)
+    return SPA_RESULT_INVALID_PORT;
+
+  if (!this->have_buffers)
+    return SPA_RESULT_NO_BUFFERS;
+
+  if (buffer_id >= this->n_buffers)
+    return SPA_RESULT_INVALID_BUFFER_ID;
+
+  recycle_buffer (this, buffer_id);
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_alsa_source_node_port_get_status (SpaNode              *node,
+                                      uint32_t              port_id,
+                                      const SpaPortStatus **status)
+{
+  SpaALSASource *this;
+
+  if (node == NULL || node->handle == NULL || status == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this = (SpaALSASource *) node->handle;
+
+  if (port_id != 0)
+    return SPA_RESULT_INVALID_PORT;
+
+  *status = &this->status;
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_alsa_source_node_port_push_input (SpaNode          *node,
+                                    unsigned int      n_info,
+                                    SpaPortInputInfo *info)
+{
+  return SPA_RESULT_NOT_IMPLEMENTED;
+}
+
+static SpaResult
+spa_alsa_source_node_port_pull_output (SpaNode           *node,
+                                     unsigned int       n_info,
+                                     SpaPortOutputInfo *info)
+{
+  SpaALSASource *this;
+  unsigned int i;
+  bool have_error = false;
+
+  if (node == NULL || node->handle == NULL || n_info == 0 || info == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this = (SpaALSASource *) node->handle;
+
+  for (i = 0; i < n_info; i++) {
+    SpaALSABuffer *b;
+
+    if (info[i].port_id != 0) {
+      info[i].status = SPA_RESULT_INVALID_PORT;
+      have_error = true;
+      continue;
+    }
+
+    if (!this->have_format) {
+      info[i].status = SPA_RESULT_NO_FORMAT;
+      have_error = true;
+      continue;
+    }
+
+    SPA_QUEUE_POP_HEAD (&this->ready, SpaALSABuffer, next, b);
+    if (b == NULL) {
+      info[i].status = SPA_RESULT_UNEXPECTED;
+      have_error = true;
+      continue;
+    }
+    b->outstanding = true;
+
+    info[i].buffer_id = b->outbuf->id;
+    info[i].status = SPA_RESULT_OK;
+  }
+  if (have_error)
+    return SPA_RESULT_ERROR;
+
+  return SPA_RESULT_OK;
+
+}
+
+static const SpaNode alsasource_node = {
+  NULL,
+  sizeof (SpaNode),
+  NULL,
+  SPA_NODE_STATE_INIT,
+  spa_alsa_source_node_get_props,
+  spa_alsa_source_node_set_props,
+  spa_alsa_source_node_send_command,
+  spa_alsa_source_node_set_event_callback,
+  spa_alsa_source_node_get_n_ports,
+  spa_alsa_source_node_get_port_ids,
+  spa_alsa_source_node_add_port,
+  spa_alsa_source_node_remove_port,
+  spa_alsa_source_node_port_enum_formats,
+  spa_alsa_source_node_port_set_format,
+  spa_alsa_source_node_port_get_format,
+  spa_alsa_source_node_port_get_info,
+  spa_alsa_source_node_port_get_props,
+  spa_alsa_source_node_port_set_props,
+  spa_alsa_source_node_port_use_buffers,
+  spa_alsa_source_node_port_alloc_buffers,
+  spa_alsa_source_node_port_reuse_buffer,
+  spa_alsa_source_node_port_get_status,
+  spa_alsa_source_node_port_push_input,
+  spa_alsa_source_node_port_pull_output,
+};
+static SpaResult
+spa_alsa_source_clock_get_props (SpaClock  *clock,
+                                 SpaProps **props)
+{
+  return SPA_RESULT_NOT_IMPLEMENTED;
+}
+
+static SpaResult
+spa_alsa_source_clock_set_props (SpaClock       *clock,
+                                 const SpaProps *props)
+{
+  return SPA_RESULT_NOT_IMPLEMENTED;
+}
+
+static SpaResult
+spa_alsa_source_clock_get_time (SpaClock         *clock,
+                                int32_t          *rate,
+                                int64_t          *ticks,
+                                int64_t          *monotonic_time)
+{
+  SpaALSASource *this;
+
+  if (clock == NULL || clock->handle == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this = (SpaALSASource *) clock->handle;
+
+  if (rate)
+    *rate = SPA_USEC_PER_SEC;
+  if (ticks)
+    *ticks = this->last_ticks;
+  if (monotonic_time)
+    *monotonic_time = this->last_monotonic;
+
+  return SPA_RESULT_OK;
+}
+
+static const SpaClock alsasource_clock = {
+  NULL,
+  sizeof (SpaClock),
+  NULL,
+  SPA_CLOCK_STATE_STOPPED,
+  spa_alsa_source_clock_get_props,
+  spa_alsa_source_clock_set_props,
+  spa_alsa_source_clock_get_time,
+};
+
+static SpaResult
+spa_alsa_source_get_interface (SpaHandle               *handle,
+                             uint32_t                 interface_id,
+                             void                   **interface)
+{
+  SpaALSASource *this;
+
+  if (handle == NULL || interface == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this = (SpaALSASource *) handle;
+
+  switch (interface_id) {
+    case SPA_INTERFACE_ID_NODE:
+      *interface = &this->node;
+      break;
+    case SPA_INTERFACE_ID_CLOCK:
+      *interface = &this->clock;
+      break;
+    default:
+      return SPA_RESULT_UNKNOWN_INTERFACE;
+  }
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+alsa_source_clear (SpaHandle *handle)
+{
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+alsa_source_init (const SpaHandleFactory  *factory,
+                  SpaHandle               *handle,
+                  const SpaDict           *info)
+{
+  SpaALSASource *this;
+  unsigned int i;
+
+  if (factory == NULL || handle == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  handle->get_interface = spa_alsa_source_get_interface;
+  handle->clear = alsa_source_clear;
+
+  this = (SpaALSASource *) handle;
+  this->node = alsasource_node;
+  this->node.handle = handle;
+  this->clock = alsasource_clock;
+  this->clock.handle = handle;
+  this->props[1].props.n_prop_info = PROP_ID_LAST;
+  this->props[1].props.prop_info = prop_info;
+  this->stream = SND_PCM_STREAM_CAPTURE;
+  reset_alsa_props (&this->props[1]);
+
+  this->status.flags = SPA_PORT_STATUS_FLAG_NEED_INPUT;
+
+  for (i = 0; info && i < info->n_items; i++) {
+    if (!strcmp (info->items[i].key, "alsa.card")) {
+      snprintf (this->props[1].device, 63, "hw:%s", info->items[i].value);
+      this->props[1].props.unset_mask &= ~1;
+    }
+  }
+  return SPA_RESULT_OK;
+}
+
+static const SpaInterfaceInfo alsa_source_interfaces[] =
+{
+  { SPA_INTERFACE_ID_NODE,
+    SPA_INTERFACE_ID_NODE_NAME,
+    SPA_INTERFACE_ID_NODE_DESCRIPTION,
+  },
+  { SPA_INTERFACE_ID_CLOCK,
+    SPA_INTERFACE_ID_CLOCK_NAME,
+    SPA_INTERFACE_ID_CLOCK_DESCRIPTION,
+  },
+};
+
+static SpaResult
+alsa_source_enum_interface_info (const SpaHandleFactory  *factory,
+                                 const SpaInterfaceInfo **info,
+                                 void                   **state)
+{
+  int index;
+
+  if (factory == NULL || info == NULL || state == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  index = (*state == NULL ? 0 : *(int*)state);
+
+  if (index < 0 || index >= SPA_N_ELEMENTS (alsa_source_interfaces))
+    return SPA_RESULT_ENUM_END;
+
+  *info = &alsa_source_interfaces[index];
+
+  *(int*)state = ++index;
+
+  return SPA_RESULT_OK;
+}
+
+const SpaHandleFactory spa_alsa_source_factory =
+{ "alsa-source",
+  NULL,
+  sizeof (SpaALSASource),
+  alsa_source_init,
+  alsa_source_enum_interface_info,
+};
diff --git a/spa/plugins/alsa/alsa-utils.c b/spa/plugins/alsa/alsa-utils.c
index 1405ffc1b..66a966e4f 100644
--- a/spa/plugins/alsa/alsa-utils.c
+++ b/spa/plugins/alsa/alsa-utils.c
@@ -106,9 +106,9 @@ spa_alsa_format_to_alsa (SpaAudioFormat format)
 }
 
 int
-spa_alsa_set_format (SpaALSAState *state, SpaFormatAudio *fmt, bool try_only)
+spa_alsa_set_format (SpaALSAState *state, SpaFormatAudio *fmt, SpaPortFormatFlags flags)
 {
-  unsigned int rrate;
+  unsigned int rrate, rchannels;
   snd_pcm_uframes_t size;
   int err, dir;
   snd_pcm_hw_params_t *params;
@@ -136,16 +136,32 @@ spa_alsa_set_format (SpaALSAState *state, SpaFormatAudio *fmt, bool try_only)
   format = spa_alsa_format_to_alsa (info->format);
   printf ("Stream parameters are %iHz, %s, %i channels\n", info->rate, snd_pcm_format_name(format), info->channels);
   CHECK (snd_pcm_hw_params_set_format (hndl, params, format), "set_format");
+
   /* set the count of channels */
-  CHECK (snd_pcm_hw_params_set_channels (hndl, params, info->channels), "set_channels");
+  rchannels = info->channels;
+  CHECK (snd_pcm_hw_params_set_channels_near (hndl, params, &rchannels), "set_channels");
+  if (rchannels != info->channels) {
+    fprintf (stderr, "Channels doesn't match (requested %u, get %u\n", info->channels, rchannels);
+    if (flags & SPA_PORT_FORMAT_FLAG_NEAREST)
+      info->channels = rchannels;
+    else
+      return -EINVAL;
+  }
+
   /* set the stream rate */
   rrate = info->rate;
   CHECK (snd_pcm_hw_params_set_rate_near (hndl, params, &rrate, 0), "set_rate_near");
   if (rrate != info->rate) {
-    printf("Rate doesn't match (requested %iHz, get %iHz)\n", info->rate, rrate);
-    return -EINVAL;
+    fprintf (stderr, "Rate doesn't match (requested %iHz, get %iHz)\n", info->rate, rrate);
+    if (flags & SPA_PORT_FORMAT_FLAG_NEAREST)
+      info->rate = rrate;
+    else
+      return -EINVAL;
   }
 
+  state->format = format;
+  state->channels = info->channels;
+  state->rate = info->rate;
   state->frame_size = info->channels * 2;
 
   /* set the buffer time */
@@ -178,6 +194,9 @@ set_swparams (SpaALSAState *state)
 
   /* get the current params */
   CHECK (snd_pcm_sw_params_current (hndl, params), "sw_params_current");
+
+  CHECK (snd_pcm_sw_params_set_tstamp_mode (hndl, params, SND_PCM_TSTAMP_ENABLE), "sw_params_set_tstamp_mode");
+
   /* start the transfer when the buffer is almost full: */
   /* (buffer_frames / avail_min) * avail_min */
   CHECK (snd_pcm_sw_params_set_start_threshold (hndl, params,
@@ -305,7 +324,6 @@ mmap_read (SpaALSAState *state)
   if (b == NULL) {
     fprintf (stderr, "no more buffers\n");
   } else {
-    b->next = NULL;
     dest = b->ptr;
   }
 
@@ -326,6 +344,8 @@ mmap_read (SpaALSAState *state)
               (uint8_t *)my_areas[0].addr + (offset * state->frame_size),
               n_bytes);
       dest += n_bytes;
+    } else {
+      snd_pcm_areas_silence (my_areas, offset, state->channels, frames, state->format);
     }
 
     commitres = snd_pcm_mmap_commit (hndl, offset, frames);
@@ -346,6 +366,7 @@ mmap_read (SpaALSAState *state)
     d = SPA_BUFFER_DATAS (b->outbuf);
     d[0].mem.size = avail * state->frame_size;
 
+    b->next = NULL;
     SPA_QUEUE_PUSH_TAIL (&state->ready, SpaALSABuffer, next, b);
 
     event.type = SPA_NODE_EVENT_TYPE_HAVE_OUTPUT;
@@ -450,13 +471,13 @@ spa_alsa_stop (SpaALSAState *state)
   if (!state->opened)
     return 0;
 
-  snd_pcm_drop (state->hndl);
-
   event.type = SPA_NODE_EVENT_TYPE_REMOVE_POLL;
   event.data = &state->poll;
   event.size = sizeof (state->poll);
   state->event_cb (&state->node, &event, state->user_data);
 
+  snd_pcm_drop (state->hndl);
+
   spa_alsa_close (state);
 
   return 0;
diff --git a/spa/plugins/alsa/alsa-utils.h b/spa/plugins/alsa/alsa-utils.h
new file mode 100644
index 000000000..af2347ff1
--- /dev/null
+++ b/spa/plugins/alsa/alsa-utils.h
@@ -0,0 +1,120 @@
+/* Spa ALSA Sink
+ * Copyright (C) 2016 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 Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __SPA_ALSA_UTILS_H__
+#define __SPA_ALSA_UTILS_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stddef.h>
+
+#include <asoundlib.h>
+
+#include <spa/queue.h>
+#include <spa/node.h>
+#include <spa/audio/format.h>
+
+typedef struct _SpaALSAState SpaALSAState;
+typedef struct _SpaALSABuffer SpaALSABuffer;
+
+typedef struct {
+  SpaProps props;
+  char device[64];
+  char device_name[128];
+  char card_name[128];
+  uint32_t buffer_time;
+  uint32_t period_time;
+  bool period_event;
+} SpaALSAProps;
+
+struct _SpaALSABuffer {
+  SpaBuffer buffer;
+  SpaMeta metas[2];
+  SpaMetaHeader header;
+  SpaMetaRingbuffer ringbuffer;
+  SpaData datas[1];
+  SpaBuffer *outbuf;
+  void *ptr;
+  bool outstanding;
+  SpaALSABuffer *next;
+};
+
+struct _SpaALSAState {
+  SpaHandle handle;
+  SpaNode node;
+  SpaClock clock;
+
+  snd_pcm_stream_t stream;
+  snd_output_t *output;
+
+  SpaNodeEventCallback event_cb;
+  void *user_data;
+
+  SpaALSAProps props[2];
+
+  bool opened;
+  snd_pcm_t *hndl;
+
+  bool have_format;
+  SpaFormatAudio query_format;
+  SpaFormatAudio current_format;
+  snd_pcm_sframes_t buffer_frames;
+  snd_pcm_sframes_t period_frames;
+  snd_pcm_format_t format;
+  int rate;
+  int channels;
+  size_t frame_size;
+
+  SpaPortInfo info;
+  SpaAllocParam *params[1];
+  SpaAllocParamBuffers param_buffers;
+  SpaPortStatus status;
+
+  bool have_buffers;
+
+  SpaMemory *alloc_bufmem;
+  SpaMemory *alloc_mem;
+  SpaALSABuffer *alloc_buffers;
+  unsigned int n_buffers;
+
+  SpaQueue free;
+  SpaQueue ready;
+
+  bool running;
+  SpaPollFd fds[16];
+  SpaPollItem poll;
+
+  int64_t last_ticks;
+  int64_t last_monotonic;
+};
+
+int spa_alsa_set_format (SpaALSAState *state,
+                         SpaFormatAudio *fmt,
+                         SpaPortFormatFlags flags);
+
+int spa_alsa_start (SpaALSAState *state);
+int spa_alsa_stop (SpaALSAState *state);
+
+#ifdef __cplusplus
+}  /* extern "C" */
+#endif
+
+#endif /* __SPA_ALSA_UTILS_H__ */
diff --git a/spa/plugins/audiotestsrc/audiotestsrc.c b/spa/plugins/audiotestsrc/audiotestsrc.c
index 9a65f0dcc..1e1ec8e75 100644
--- a/spa/plugins/audiotestsrc/audiotestsrc.c
+++ b/spa/plugins/audiotestsrc/audiotestsrc.c
@@ -28,8 +28,7 @@
 #include <spa/queue.h>
 #include <spa/audio/format.h>
 
-#define TIMESPEC_TO_TIME(ts)      ((ts)->tv_sec * 1000000000ll + (ts)->tv_nsec)
-#define SAMPLES_TO_TIME(this,s)   ((s) * 1000000000ll / (this)->current_format.info.raw.rate)
+#define SAMPLES_TO_TIME(this,s)   ((s) * SPA_NSEC_PER_SEC / (this)->current_format.info.raw.rate)
 #define BYTES_TO_SAMPLES(this,b)  ((b)/(this)->bpf)
 #define BYTES_TO_TIME(this,b)     SAMPLES_TO_TIME(this, BYTES_TO_SAMPLES (this, b))
 
@@ -100,7 +99,7 @@ struct _SpaAudioTestSrc {
 #define DEFAULT_WAVE 0
 #define DEFAULT_VOLUME 1.0
 #define DEFAULT_FREQ 440.0
-#define DEFAULT_LIVE true
+#define DEFAULT_LIVE false
 
 static const double min_volume = 0.0;
 static const double max_volume = 10.0;
@@ -282,8 +281,8 @@ audiotestsrc_on_output (SpaPollNotifyData *data)
       perror ("read timerfd");
 
     next_time = this->start_time + this->elapsed_time;
-    this->timerspec.it_value.tv_sec = next_time / 1000000000;
-    this->timerspec.it_value.tv_nsec = next_time % 1000000000;
+    this->timerspec.it_value.tv_sec = next_time / SPA_NSEC_PER_SEC;
+    this->timerspec.it_value.tv_nsec = next_time % SPA_NSEC_PER_SEC;
     timerfd_settime (this->fds[0].fd, TFD_TIMER_ABSTIME, &this->timerspec, NULL);
   }
 
@@ -325,8 +324,8 @@ update_poll_enabled (SpaAudioTestSrc *this, bool enabled)
     if (this->props[1].live) {
       if (enabled) {
         uint64_t next_time = this->start_time + this->elapsed_time;
-        this->timerspec.it_value.tv_sec = next_time / 1000000000;
-        this->timerspec.it_value.tv_nsec = next_time % 1000000000;
+        this->timerspec.it_value.tv_sec = next_time / SPA_NSEC_PER_SEC;
+        this->timerspec.it_value.tv_nsec = next_time % SPA_NSEC_PER_SEC;
       }
       else {
         this->timerspec.it_value.tv_sec = 0;
@@ -379,7 +378,10 @@ spa_audiotestsrc_node_send_command (SpaNode        *node,
         return SPA_RESULT_OK;
 
       clock_gettime (CLOCK_MONOTONIC, &now);
-      this->start_time = TIMESPEC_TO_TIME (&now);
+      if (this->props[1].live)
+        this->start_time = SPA_TIMESPEC_TO_TIME (&now);
+      else
+        this->start_time = 0;
       this->sample_count = 0;
       this->elapsed_time = 0;
 
@@ -945,10 +947,10 @@ spa_audiotestsrc_clock_get_time (SpaClock         *clock,
     return SPA_RESULT_INVALID_ARGUMENTS;
 
   if (rate)
-    *rate = 1000000000;
+    *rate = SPA_NSEC_PER_SEC;
 
   clock_gettime (CLOCK_MONOTONIC, &now);
-  tnow = TIMESPEC_TO_TIME (&now);
+  tnow = SPA_TIMESPEC_TO_TIME (&now);
 
   if (ticks)
     *ticks = tnow;
diff --git a/spa/plugins/v4l2/v4l2-source.c b/spa/plugins/v4l2/v4l2-source.c
index 7c82d349f..061fc6352 100644
--- a/spa/plugins/v4l2/v4l2-source.c
+++ b/spa/plugins/v4l2/v4l2-source.c
@@ -783,7 +783,7 @@ spa_v4l2_source_clock_get_time (SpaClock         *clock,
   state = &this->state[0];
 
   if (rate)
-    *rate = 1000000;
+    *rate = SPA_USEC_PER_SEC;
   if (ticks)
     *ticks = state->last_ticks;
   if (monotonic_time)
@@ -856,12 +856,12 @@ v4l2_source_init (const SpaHandleFactory  *factory,
   this->props[1].props.prop_info = prop_info;
   reset_v4l2_source_props (&this->props[1]);
 
-  this->state[0].info.flags = SPA_PORT_INFO_FLAG_NONE;
+  this->state[0].info.flags = SPA_PORT_INFO_FLAG_LIVE;
   this->state[0].status.flags = SPA_PORT_STATUS_FLAG_NONE;
 
   this->state[0].export_buf = true;
 
-  for (i = 0; info && i < info->n_items; i ++) {
+  for (i = 0; info && i < info->n_items; i++) {
     if (!strcmp (info->items[i].key, "device.path")) {
       strncpy (this->props[1].device, info->items[i].value, 63);
       this->props[1].props.unset_mask &= ~1;
diff --git a/spa/plugins/v4l2/v4l2-utils.c b/spa/plugins/v4l2/v4l2-utils.c
index eb89835bf..457e2cdc0 100644
--- a/spa/plugins/v4l2/v4l2-utils.c
+++ b/spa/plugins/v4l2/v4l2-utils.c
@@ -785,9 +785,10 @@ spa_v4l2_set_format (SpaV4l2Source *this, V4l2Format *f, bool try_only)
 
   state->fmt = fmt;
   state->info.flags = SPA_PORT_INFO_FLAG_CAN_ALLOC_BUFFERS |
-                      SPA_PORT_INFO_FLAG_CAN_USE_BUFFERS;
+                      SPA_PORT_INFO_FLAG_CAN_USE_BUFFERS |
+                      SPA_PORT_INFO_FLAG_LIVE;
   state->info.maxbuffering = -1;
-  state->info.latency = (streamparm.parm.capture.timeperframe.numerator * 1000000000LL) /
+  state->info.latency = (streamparm.parm.capture.timeperframe.numerator * SPA_NSEC_PER_SEC) /
                         streamparm.parm.capture.timeperframe.denominator;
 
   state->info.n_params = 1;
@@ -833,7 +834,7 @@ mmap_read (SpaV4l2Source *this)
   if (buf.flags & V4L2_BUF_FLAG_ERROR)
     b->header.flags |= SPA_BUFFER_FLAG_CORRUPTED;
 
-  state->last_ticks = (int64_t)buf.timestamp.tv_sec * 1000000 + (uint64_t)buf.timestamp.tv_usec;
+  state->last_ticks = (int64_t)buf.timestamp.tv_sec * SPA_USEC_PER_SEC + (uint64_t)buf.timestamp.tv_usec;
 
   b->header.seq = buf.sequence;
   b->header.pts = state->last_ticks * 1000;
diff --git a/spa/plugins/videotestsrc/videotestsrc.c b/spa/plugins/videotestsrc/videotestsrc.c
index bcef43fb8..fbeb4ef9f 100644
--- a/spa/plugins/videotestsrc/videotestsrc.c
+++ b/spa/plugins/videotestsrc/videotestsrc.c
@@ -29,8 +29,7 @@
 #include <spa/queue.h>
 #include <spa/video/format.h>
 
-#define TIMESPEC_TO_TIME(ts)      ((ts)->tv_sec * 1000000000ll + (ts)->tv_nsec)
-#define FRAMES_TO_TIME(this,f)    ((this->current_format.info.raw.framerate.num * (f) * 1000000000ll) / \
+#define FRAMES_TO_TIME(this,f)    ((this->current_format.info.raw.framerate.num * (f) * SPA_NSEC_PER_SEC) / \
                                    (this->current_format.info.raw.framerate.denom))
 
 #define STATE_GET_IMAGE_WIDTH(this)   this->current_format.info.raw.size.width
@@ -100,7 +99,7 @@ struct _SpaVideoTestSrc {
   SpaQueue ready;
 };
 
-#define DEFAULT_LIVE true
+#define DEFAULT_LIVE false
 
 enum {
   PROP_ID_LIVE,
@@ -230,8 +229,8 @@ videotestsrc_on_output (SpaPollNotifyData *data)
       perror ("read timerfd");
 
     next_time = this->start_time + this->elapsed_time;
-    this->timerspec.it_value.tv_sec = next_time / 1000000000;
-    this->timerspec.it_value.tv_nsec = next_time % 1000000000;
+    this->timerspec.it_value.tv_sec = next_time / SPA_NSEC_PER_SEC;
+    this->timerspec.it_value.tv_nsec = next_time % SPA_NSEC_PER_SEC;
     timerfd_settime (this->fds[0].fd, TFD_TIMER_ABSTIME, &this->timerspec, NULL);
   }
 
@@ -273,8 +272,8 @@ update_poll_enabled (SpaVideoTestSrc *this, bool enabled)
     if (this->props[1].live) {
       if (enabled) {
         uint64_t next_time = this->start_time + this->elapsed_time;
-        this->timerspec.it_value.tv_sec = next_time / 1000000000;
-        this->timerspec.it_value.tv_nsec = next_time % 1000000000;
+        this->timerspec.it_value.tv_sec = next_time / SPA_NSEC_PER_SEC;
+        this->timerspec.it_value.tv_nsec = next_time % SPA_NSEC_PER_SEC;
       }
       else {
         this->timerspec.it_value.tv_sec = 0;
@@ -327,7 +326,10 @@ spa_videotestsrc_node_send_command (SpaNode        *node,
         return SPA_RESULT_OK;
 
       clock_gettime (CLOCK_MONOTONIC, &now);
-      this->start_time = TIMESPEC_TO_TIME (&now);
+      if (this->props[1].live)
+        this->start_time = SPA_TIMESPEC_TO_TIME (&now);
+      else
+        this->start_time = 0;
       this->frame_count = 0;
       this->elapsed_time = 0;
 
@@ -894,10 +896,10 @@ spa_videotestsrc_clock_get_time (SpaClock         *clock,
     return SPA_RESULT_INVALID_ARGUMENTS;
 
   if (rate)
-    *rate = 1000000000;
+    *rate = SPA_NSEC_PER_SEC;
 
   clock_gettime (CLOCK_MONOTONIC, &now);
-  tnow = TIMESPEC_TO_TIME (&now);
+  tnow = SPA_TIMESPEC_TO_TIME (&now);
 
   if (ticks)
     *ticks = tnow;