/* * Copyright (C) 2014 Michal Ratajsky * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the licence, 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, see . */ #include "config.h" #include #include #include #include #include #include #include #ifdef HAVE_SYSCTLBYNAME #include #endif #include #include #include "oss-backend.h" #include "oss-common.h" #include "oss-device.h" #include "oss-stream.h" #define BACKEND_NAME "OSS" #define BACKEND_PRIORITY 10 #define BACKEND_FLAGS MATE_MIXER_BACKEND_NO_FLAGS #define OSS_MAX_DEVICES 32 struct _OssBackendPrivate { OssDevice *default_device; GSource *timeout_source; GSource *timeout_source_default; GList *streams; GList *devices; GHashTable *devices_paths; }; static void oss_backend_class_init (OssBackendClass *klass); static void oss_backend_class_finalize (OssBackendClass *klass); static void oss_backend_init (OssBackend *oss); static void oss_backend_dispose (GObject *object); static void oss_backend_finalize (GObject *object); #pragma clang diagnostic push #pragma clang diagnostic ignored "-Wunused-function" G_DEFINE_DYNAMIC_TYPE (OssBackend, oss_backend, MATE_MIXER_TYPE_BACKEND) #pragma clang diagnostic pop static gboolean oss_backend_open (MateMixerBackend *backend); static void oss_backend_close (MateMixerBackend *backend); static const GList *oss_backend_list_devices (MateMixerBackend *backend); static const GList *oss_backend_list_streams (MateMixerBackend *backend); static gboolean read_devices (OssBackend *oss); static gboolean read_device (OssBackend *oss, const gchar *path); static gchar * read_device_label (OssBackend *oss, const gchar *path, gint fd); #ifdef HAVE_SYSCTLBYNAME static gboolean read_device_default_unit (OssBackend *oss); #endif static void add_device (OssBackend *oss, OssDevice *device); static void remove_device (OssBackend *oss, OssDevice *device); static void remove_device_by_path (OssBackend *oss, const gchar *path); static void remove_device_by_list_item (OssBackend *oss, GList *item); static void remove_stream (OssBackend *oss, MateMixerStream *stream); static void select_default_input_stream (OssBackend *oss); static void select_default_output_stream (OssBackend *oss); static void set_default_device (OssBackend *oss, OssDevice *device); static void set_default_device_index (OssBackend *oss, guint index, gboolean fallback) G_GNUC_UNUSED; static void free_stream_list (OssBackend *oss); static gint compare_devices (gconstpointer a, gconstpointer b); static gint compare_device_path (gconstpointer a, gconstpointer b); static MateMixerBackendInfo info; void backend_module_init (GTypeModule *module) { oss_backend_register_type (module); info.name = BACKEND_NAME; info.priority = BACKEND_PRIORITY; info.g_type = OSS_TYPE_BACKEND; info.backend_flags = BACKEND_FLAGS; info.backend_type = MATE_MIXER_BACKEND_OSS; } const MateMixerBackendInfo *backend_module_get_info (void) { return &info; } static void oss_backend_class_init (OssBackendClass *klass) { GObjectClass *object_class; MateMixerBackendClass *backend_class; object_class = G_OBJECT_CLASS (klass); object_class->dispose = oss_backend_dispose; object_class->finalize = oss_backend_finalize; backend_class = MATE_MIXER_BACKEND_CLASS (klass); backend_class->open = oss_backend_open; backend_class->close = oss_backend_close; backend_class->list_devices = oss_backend_list_devices; backend_class->list_streams = oss_backend_list_streams; g_type_class_add_private (object_class, sizeof (OssBackendPrivate)); } /* Called in the code generated by G_DEFINE_DYNAMIC_TYPE() */ static void oss_backend_class_finalize (OssBackendClass *klass) { } static void oss_backend_init (OssBackend *oss) { oss->priv = G_TYPE_INSTANCE_GET_PRIVATE (oss, OSS_TYPE_BACKEND, OssBackendPrivate); oss->priv->devices_paths = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL); } static void oss_backend_dispose (GObject *object) { MateMixerBackend *backend; MateMixerState state; backend = MATE_MIXER_BACKEND (object); state = mate_mixer_backend_get_state (backend); if (state != MATE_MIXER_STATE_IDLE) oss_backend_close (backend); G_OBJECT_CLASS (oss_backend_parent_class)->dispose (object); } static void oss_backend_finalize (GObject *object) { OssBackend *oss; oss = OSS_BACKEND (object); g_hash_table_unref (oss->priv->devices_paths); G_OBJECT_CLASS (oss_backend_parent_class)->finalize (object); } static gboolean oss_backend_open (MateMixerBackend *backend) { OssBackend *oss; g_return_val_if_fail (OSS_IS_BACKEND (backend), FALSE); oss = OSS_BACKEND (backend); /* Discover added or removed OSS devices every second */ oss->priv->timeout_source = g_timeout_source_new_seconds (1); g_source_set_callback (oss->priv->timeout_source, (GSourceFunc) read_devices, oss, NULL); g_source_attach (oss->priv->timeout_source, g_main_context_get_thread_default ()); /* * Read the initial list of devices so we have some starting point, there * isn't really a way to detect errors here, failing to add a device may * be a device-related problem so make the backend always open successfully. */ read_devices (oss); /* * Try to read the current default device and if the sysctl call succeeds, * poll OSS for changes every second. * * This feature is only available on FreeBSD and probably some derived * systems. */ #ifdef HAVE_SYSCTLBYNAME do { int unit; int ret; size_t len = sizeof (unit); ret = sysctlbyname ("hw.snd.default_unit", &unit, &len, NULL, 0); if (ret == 0) { set_default_device_index (oss, unit, TRUE); oss->priv->timeout_source_default = g_timeout_source_new_seconds (1); g_source_set_callback (oss->priv->timeout_source_default, (GSourceFunc) read_device_default_unit, oss, NULL); g_source_attach (oss->priv->timeout_source_default, g_main_context_get_thread_default ()); } } while (0); #endif /* HAVE_SYSCTLBYNAME */ _mate_mixer_backend_set_state (backend, MATE_MIXER_STATE_READY); return TRUE; } void oss_backend_close (MateMixerBackend *backend) { OssBackend *oss; g_return_if_fail (OSS_IS_BACKEND (backend)); oss = OSS_BACKEND (backend); g_source_destroy (oss->priv->timeout_source); if (oss->priv->timeout_source_default != NULL) g_source_destroy (oss->priv->timeout_source_default); if (oss->priv->devices != NULL) { g_list_free_full (oss->priv->devices, g_object_unref); oss->priv->devices = NULL; } free_stream_list (oss); g_clear_object (&oss->priv->default_device); g_hash_table_remove_all (oss->priv->devices_paths); _mate_mixer_backend_set_state (backend, MATE_MIXER_STATE_IDLE); } static const GList * oss_backend_list_devices (MateMixerBackend *backend) { g_return_val_if_fail (OSS_IS_BACKEND (backend), NULL); return OSS_BACKEND (backend)->priv->devices; } static const GList * oss_backend_list_streams (MateMixerBackend *backend) { OssBackend *oss; g_return_val_if_fail (OSS_IS_BACKEND (backend), NULL); oss = OSS_BACKEND (backend); if (oss->priv->streams == NULL) { GList *list; /* Walk through the list of devices and create the stream list, each * device has at most one input and one output stream */ list = g_list_last (oss->priv->devices); while (list != NULL) { OssDevice *device = OSS_DEVICE (list->data); OssStream *stream; stream = oss_device_get_output_stream (device); if (stream != NULL) oss->priv->streams = g_list_prepend (oss->priv->streams, g_object_ref (stream)); stream = oss_device_get_input_stream (device); if (stream != NULL) oss->priv->streams = g_list_prepend (oss->priv->streams, g_object_ref (stream)); list = list->prev; } } return oss->priv->streams; } static gboolean read_devices (OssBackend *oss) { guint i; for (i = 0; i < OSS_MAX_DEVICES; i++) { gchar *path; path = g_strdup_printf ("/dev/mixer%u", i); /* * On FreeBSD both /dev/mixer and /dev/mixer0 point to the same mixer * device. * On NetBSD and OpenBSD /dev/mixer is a symlink to one of the real mixer * device nodes. * On Linux /dev/mixer is the first device and /dev/mixer1 is the second * device. * * Handle all of these cases by trying /dev/mixer if /dev/mixer0 fails. */ if (read_device (oss, path) == FALSE && i == 0) read_device (oss, "/dev/mixer"); g_free (path); } /* Select the first device as default if one is not selected already */ if (oss->priv->default_device == NULL) { OssDevice *first = NULL; if (oss->priv->devices != NULL) first = OSS_DEVICE (oss->priv->devices->data); set_default_device (oss, first); } return G_SOURCE_CONTINUE; } static gboolean read_device (OssBackend *oss, const gchar *path) { OssDevice *device; gint fd; gchar *bname; gchar *label; fd = g_open (path, O_RDWR, 0); if (fd == -1) { if (errno != ENOENT && errno != ENXIO) g_debug ("%s: %s", path, g_strerror (errno)); remove_device_by_path (oss, path); return FALSE; } /* * Don't proceed if the device is already known. * * Opening the device was still tested to be absolutely sure that the * device is removed it case it has disappeared, but normally the * device's polling facility should handle this by itself. */ if (g_hash_table_contains (oss->priv->devices_paths, path) == TRUE) { close (fd); return TRUE; } bname = g_path_get_basename (path); label = read_device_label (oss, path, fd); device = oss_device_new (bname, label, path, fd); g_free (bname); g_free (label); close (fd); if G_LIKELY (device != NULL) { if (oss_device_open (device) == TRUE) { add_device (oss, device); return TRUE; } g_object_unref (device); } return FALSE; } static gchar * read_device_label (OssBackend *oss, const gchar *path, gint fd) { guint index; #ifdef SOUND_MIXER_INFO do { struct mixer_info info; /* Prefer device name supplied by the system, but this calls fails * with EINVAL on FreeBSD */ if (ioctl (fd, SOUND_MIXER_INFO, &info) == 0) return g_strdup (info.name); } while (0); #endif /* SOUND_MIXER_INFO */ index = (guint) g_ascii_strtoull (path + sizeof ("/dev/mixer") - 1, NULL, 10); #ifdef HAVE_SYSCTLBYNAME /* * Older FreeBSDs don't support the ioctl. * * Assume that the mixer device number matches the PCM device number and * use sysctl to figure out the name of the device. */ do { gchar *name; char label[255]; int ret; size_t len = sizeof (label); name = g_strdup_printf ("dev.pcm.%d.%%desc", index); ret = sysctlbyname (name, &label, &len, NULL, 0); g_free (name); if (ret == 0) return g_strndup (label, len); } while (0); #endif /* HAVE_SYSCTLBYNAME */ return g_strdup_printf (_("OSS Mixer %d"), index); } #ifdef HAVE_SYSCTLBYNAME static gboolean read_device_default_unit (OssBackend *oss) { int unit; int ret; size_t len = sizeof (unit); ret = sysctlbyname ("hw.snd.default_unit", &unit, &len, NULL, 0); if (ret == 0) set_default_device_index (oss, unit, TRUE); return G_SOURCE_CONTINUE; } #endif /* HAVE_SYSCTLBYNAME */ static void add_device (OssBackend *oss, OssDevice *device) { /* Takes reference of device */ oss->priv->devices = g_list_insert_sorted_with_data (oss->priv->devices, device, (GCompareDataFunc) compare_devices, NULL); /* Keep track of added device paths */ g_hash_table_add (oss->priv->devices_paths, g_strdup (oss_device_get_path (device))); g_signal_connect_swapped (G_OBJECT (device), "closed", G_CALLBACK (remove_device), oss); g_signal_connect_swapped (G_OBJECT (device), "stream-removed", G_CALLBACK (remove_stream), oss); g_signal_connect_swapped (G_OBJECT (device), "closed", G_CALLBACK (free_stream_list), oss); g_signal_connect_swapped (G_OBJECT (device), "stream-added", G_CALLBACK (free_stream_list), oss); g_signal_connect_swapped (G_OBJECT (device), "stream-removed", G_CALLBACK (free_stream_list), oss); g_signal_emit_by_name (G_OBJECT (oss), "device-added", MATE_MIXER_DEVICE (device)); /* Load the device elements after emitting device-added, because the load * function will most likely emit stream-added on the device and backend */ oss_device_load (device); } static void remove_device (OssBackend *oss, OssDevice *device) { GList *item; item = g_list_find (oss->priv->devices, device); if (item != NULL) remove_device_by_list_item (oss, item); } static void remove_device_by_path (OssBackend *oss, const gchar *path) { GList *item; item = g_list_find_custom (oss->priv->devices, path, compare_device_path); if (item != NULL) remove_device_by_list_item (oss, item); } static void remove_device_by_list_item (OssBackend *oss, GList *item) { OssDevice *device; device = OSS_DEVICE (item->data); g_signal_handlers_disconnect_by_func (G_OBJECT (device), G_CALLBACK (remove_device), oss); oss->priv->devices = g_list_delete_link (oss->priv->devices, item); g_hash_table_remove (oss->priv->devices_paths, oss_device_get_path (device)); /* If the removed device is the current default device, change the default * to the first device in the internal list */ if (device == oss->priv->default_device) { OssDevice *first = NULL; if (oss->priv->devices != NULL) first = OSS_DEVICE (oss->priv->devices->data); set_default_device (oss, first); } /* Closing a device emits stream-removed signals, close after fixing the * default device to avoid re-validating default streams as they get * removed */ if (oss_device_is_open (device) == TRUE) oss_device_close (device); g_signal_handlers_disconnect_by_data (G_OBJECT (device), oss); g_signal_emit_by_name (G_OBJECT (oss), "device-removed", MATE_MIXER_DEVICE (device)); g_object_unref (device); } static void remove_stream (OssBackend *oss, MateMixerStream *stream) { MateMixerStream *def; def = mate_mixer_backend_get_default_input_stream (MATE_MIXER_BACKEND (oss)); if (def == stream) select_default_input_stream (oss); def = mate_mixer_backend_get_default_output_stream (MATE_MIXER_BACKEND (oss)); if (def == stream) select_default_output_stream (oss); } static void select_default_input_stream (OssBackend *oss) { OssStream *stream; GList *list; /* First try the default device */ if (oss->priv->default_device != NULL) { stream = oss_device_get_input_stream (oss->priv->default_device); if (stream != NULL) { _mate_mixer_backend_set_default_input_stream (MATE_MIXER_BACKEND (oss), MATE_MIXER_STREAM (stream)); return; } } list = oss->priv->devices; while (list != NULL) { OssDevice *device = OSS_DEVICE (list->data); if (device != oss->priv->default_device) { stream = oss_device_get_input_stream (device); if (stream != NULL) { _mate_mixer_backend_set_default_input_stream (MATE_MIXER_BACKEND (oss), MATE_MIXER_STREAM (stream)); return; } } list = list->next; } /* In the worst case unset the default stream */ _mate_mixer_backend_set_default_input_stream (MATE_MIXER_BACKEND (oss), NULL); } static void select_default_output_stream (OssBackend *oss) { OssStream *stream; GList *list; /* First try the default device */ if (oss->priv->default_device != NULL) { stream = oss_device_get_output_stream (oss->priv->default_device); if (stream != NULL) { _mate_mixer_backend_set_default_output_stream (MATE_MIXER_BACKEND (oss), MATE_MIXER_STREAM (stream)); return; } } list = oss->priv->devices; while (list != NULL) { OssDevice *device = OSS_DEVICE (list->data); if (device != oss->priv->default_device) { stream = oss_device_get_output_stream (device); if (stream != NULL) { _mate_mixer_backend_set_default_output_stream (MATE_MIXER_BACKEND (oss), MATE_MIXER_STREAM (stream)); return; } } list = list->next; } /* In the worst case unset the default stream */ _mate_mixer_backend_set_default_output_stream (MATE_MIXER_BACKEND (oss), NULL); } static void set_default_device (OssBackend *oss, OssDevice *device) { if (oss->priv->default_device == device) return; g_clear_object (&oss->priv->default_device); if (device != NULL) { oss->priv->default_device = g_object_ref (device); g_debug ("Default device changed to %s", mate_mixer_device_get_name (MATE_MIXER_DEVICE (device))); } else g_debug ("Default device unset"); select_default_input_stream (oss); select_default_output_stream (oss); } static void set_default_device_index (OssBackend *oss, guint index, gboolean fallback) { gchar *name; MateMixerDevice *device; name = g_strdup_printf ("mixer%u", index); /* Find the device with matching index */ device = mate_mixer_backend_get_device (MATE_MIXER_BACKEND (oss), name); if (device == NULL && index == 0) device = mate_mixer_backend_get_device (MATE_MIXER_BACKEND (oss), "mixer"); g_free (name); if (device != NULL) { set_default_device (oss, OSS_DEVICE (device)); return; } /* Fallback causes the first available device to be set in case device * with the requested index is not available */ if (fallback == TRUE && oss->priv->devices != NULL) { set_default_device (oss, OSS_DEVICE (oss->priv->devices->data)); return; } set_default_device (oss, NULL); } static void free_stream_list (OssBackend *oss) { if (oss->priv->streams == NULL) return; g_list_free_full (oss->priv->streams, g_object_unref); oss->priv->streams = NULL; } static gint compare_devices (gconstpointer a, gconstpointer b) { MateMixerDevice *d1 = MATE_MIXER_DEVICE (a); MateMixerDevice *d2 = MATE_MIXER_DEVICE (b); return strcmp (mate_mixer_device_get_name (d1), mate_mixer_device_get_name (d2)); } static gint compare_device_path (gconstpointer a, gconstpointer b) { OssDevice *device = OSS_DEVICE (a); const gchar *path = (const gchar *) b; return strcmp (oss_device_get_path (device), path); }