Cleanups

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,
+};