Add initial support for OSSv4. Mixer still needs a bit more love, but even magic has its limits.

Original commit message from CVS:
* configure.ac:
* sys/Makefile.am:
* sys/oss4/Makefile.am:
* sys/oss4/oss4-audio.c:
* sys/oss4/oss4-audio.h:
* sys/oss4/oss4-mixer-enum.c:
* sys/oss4/oss4-mixer-enum.h:
* sys/oss4/oss4-mixer-slider.c:
* sys/oss4/oss4-mixer-slider.h:
* sys/oss4/oss4-mixer-switch.c:
* sys/oss4/oss4-mixer-switch.h:
* sys/oss4/oss4-mixer.c:
* sys/oss4/oss4-mixer.h:
* sys/oss4/oss4-property-probe.c:
* sys/oss4/oss4-property-probe.h:
* sys/oss4/oss4-sink.c:
* sys/oss4/oss4-sink.h:
* sys/oss4/oss4-soundcard.h:
* sys/oss4/oss4-source.c:
* sys/oss4/oss4-source.h:
Add initial support for OSSv4. Mixer still needs a bit more love,
but even magic has its limits.

1 files changed, 396 insertions, 0 deletions

diff --git a/sys/oss4/oss4-property-probe.c b/sys/oss4/oss4-property-probe.c
new file mode 100644
index 00000000..e4b56679
--- /dev/null
+++ b/sys/oss4/oss4-property-probe.c
@@ -0,0 +1,396 @@
+/* GStreamer OSS4 audio property probe interface implementation
+ * Copyright (C) 2007-2008 Tim-Philipp Müller <tim centricular net>
+ *
+ * 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <gst/gst.h>
+
+#define NO_LEGACY_MIXER
+#include "oss4-audio.h"
+#include "oss4-mixer.h"
+#include "oss4-sink.h"
+#include "oss4-source.h"
+#include "oss4-soundcard.h"
+#include "oss4-property-probe.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+
+GST_DEBUG_CATEGORY_EXTERN (oss4_debug);
+#define GST_CAT_DEFAULT oss4_debug
+
+static const GList *
+gst_oss4_property_probe_get_properties (GstPropertyProbe * probe)
+{
+  GObjectClass *klass = G_OBJECT_GET_CLASS (probe);
+  GList *list;
+
+  GST_OBJECT_LOCK (GST_OBJECT (probe));
+
+  /* we create a new list and store it in the instance struct, since apparently
+   * we forgot to update the API for 0.10 (and why don't we mark probable
+   * properties with a flag instead anyway?). A bit hackish, but what can you
+   * do (can't really use a static variable since the pspec will be different
+   * for src and sink class); this isn't particularly pretty, but the best
+   * we can do given that we can't create a common base class (we could do
+   * fancy things with the interface, or use g_object_set_data instead, but
+   * it's not really going to make it much better) */
+  if (GST_IS_AUDIO_SINK_CLASS (klass)) {
+    list = GST_OSS4_SINK (probe)->property_probe_list;
+  } else if (GST_IS_AUDIO_SRC_CLASS (klass)) {
+    list = GST_OSS4_SOURCE (probe)->property_probe_list;
+  } else if (GST_IS_OSS4_MIXER_CLASS (klass)) {
+    list = GST_OSS4_MIXER (probe)->property_probe_list;
+  } else {
+    GST_OBJECT_UNLOCK (GST_OBJECT (probe));
+    g_return_val_if_reached (NULL);
+  }
+
+  if (list == NULL) {
+    GParamSpec *pspec;
+
+    pspec = g_object_class_find_property (klass, "device");
+    list = g_list_prepend (NULL, pspec);
+
+    if (GST_IS_AUDIO_SINK_CLASS (klass)) {
+      GST_OSS4_SINK (probe)->property_probe_list = list;
+    } else if (GST_IS_AUDIO_SRC_CLASS (klass)) {
+      GST_OSS4_SOURCE (probe)->property_probe_list = list;
+    } else if (GST_IS_OSS4_MIXER_CLASS (klass)) {
+      GST_OSS4_MIXER (probe)->property_probe_list = list;
+    }
+  }
+
+  GST_OBJECT_UNLOCK (GST_OBJECT (probe));
+
+  return list;
+}
+
+static void
+gst_oss4_property_probe_probe_property (GstPropertyProbe * probe,
+    guint prop_id, const GParamSpec * pspec)
+{
+  if (!g_str_equal (pspec->name, "device")) {
+    G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
+  }
+}
+
+static gboolean
+gst_oss4_property_probe_needs_probe (GstPropertyProbe * probe,
+    guint prop_id, const GParamSpec * pspec)
+{
+  /* don't cache probed data */
+  return TRUE;
+}
+
+static gint
+oss4_mixerinfo_priority_cmp (struct oss_mixerinfo *mi1,
+    struct oss_mixerinfo *mi2)
+{
+  /* return negative vaue if mi1 comes before mi2 */
+  if (mi1->priority != mi2->priority)
+    return mi2->priority - mi1->priority;
+
+  return strcmp (mi1->devnode, mi2->devnode);
+}
+
+/* caller must ensure LOCK is taken (e.g. if ioctls need to be serialised) */
+gboolean
+gst_oss4_property_probe_find_device_name (GstObject * obj, int fd,
+    const gchar * device_handle, gchar ** device_name)
+{
+  struct oss_sysinfo si = { {0,}, };
+  gchar *name = NULL;
+
+  if (ioctl (fd, SNDCTL_SYSINFO, &si) == 0) {
+    int i;
+
+    for (i = 0; i < si.numaudios; ++i) {
+      struct oss_audioinfo ai = { 0, };
+
+      ai.dev = i;
+      if (ioctl (fd, SNDCTL_AUDIOINFO, &ai) == -1) {
+        GST_DEBUG_OBJECT (obj, "AUDIOINFO ioctl for device %d failed", i);
+        continue;
+      }
+      if (strcmp (ai.devnode, device_handle) == 0) {
+        name = g_strdup (ai.name);
+        break;
+      }
+    }
+  } else {
+    GST_WARNING_OBJECT (obj, "SYSINFO ioctl failed: %s", g_strerror (errno));
+  }
+
+  /* try ENGINEINFO as fallback (which is better than nothing) */
+  if (name == NULL) {
+    struct oss_audioinfo ai = { 0, };
+
+    GST_LOG_OBJECT (obj, "device %s not listed in AUDIOINFO", device_handle);
+    ai.dev = -1;
+    if (ioctl (fd, SNDCTL_ENGINEINFO, &ai) == 0)
+      name = g_strdup (ai.name);
+  }
+
+  GST_DEBUG_OBJECT (obj, "Device name: %s", GST_STR_NULL (name));
+
+  if (name != NULL)
+    *device_name = name;
+
+  return (name != NULL);
+}
+
+static GList *
+gst_oss4_property_probe_get_mixer_devices (GstObject * obj, int fd,
+    struct oss_sysinfo *si)
+{
+  GList *m, *mixers = NULL;
+  GList *devices = NULL;
+
+  int i;
+
+  GST_LOG_OBJECT (obj, "%d mixer devices", si->nummixers);
+
+  /* first, find suitable mixer devices and sort by priority */
+  for (i = 0; i < si->nummixers; ++i) {
+    struct oss_mixerinfo mi = { 0, };
+
+    mi.dev = i;
+    if (ioctl (fd, SNDCTL_MIXERINFO, &mi) == -1) {
+      GST_DEBUG_OBJECT (obj, "MIXERINFO ioctl for device %d failed", i);
+      continue;
+    }
+
+    GST_INFO_OBJECT (obj, "mixer device %d:", i);
+    GST_INFO_OBJECT (obj, "  enabled  : %s", (mi.enabled) ? "yes" :
+        "no (powered off or unplugged)");
+    GST_INFO_OBJECT (obj, "  priority : %d", mi.priority);
+    GST_INFO_OBJECT (obj, "  devnode  : %s", mi.devnode);
+    GST_INFO_OBJECT (obj, "  handle   : %s", mi.handle);
+    GST_INFO_OBJECT (obj, "  caps     : 0x%02x", mi.caps);
+    GST_INFO_OBJECT (obj, "  name     : %s", mi.name);
+
+    if (!mi.enabled) {
+      GST_DEBUG_OBJECT (obj, "mixer device is not usable/enabled, skipping");
+      continue;
+    }
+
+    /* only want mixers that control hardware directly */
+    if ((mi.caps & MIXER_CAP_VIRTUAL)) {
+      GST_DEBUG_OBJECT (obj, "mixer device is a virtual device, skipping");
+      continue;
+    }
+
+    mixers = g_list_insert_sorted (mixers, g_memdup (&mi, sizeof (mi)),
+        (GCompareFunc) oss4_mixerinfo_priority_cmp);
+  }
+
+  /* then create device list according to priority */
+  for (m = mixers; m != NULL; m = m->next) {
+    struct oss_mixerinfo *mi = (struct oss_mixerinfo *) m->data;
+
+    GST_LOG_OBJECT (obj, "mixer device: '%s'", mi->devnode);
+    devices = g_list_prepend (devices, g_strdup (mi->devnode));
+    g_free (m->data);
+  }
+  g_list_free (mixers);
+  mixers = NULL;
+
+  return g_list_reverse (devices);
+}
+
+static GList *
+gst_oss4_property_probe_get_audio_devices (GstObject * obj, int fd,
+    struct oss_sysinfo *si, int cap_mask)
+{
+  GList *devices = NULL;
+  int i;
+
+  GST_LOG_OBJECT (obj, "%d audio/dsp devices", si->numaudios);
+
+  for (i = 0; i < si->numaudios; ++i) {
+    struct oss_audioinfo ai = { 0, };
+
+    ai.dev = i;
+    if (ioctl (fd, SNDCTL_AUDIOINFO, &ai) == -1) {
+      GST_DEBUG_OBJECT (obj, "AUDIOINFO ioctl for device %d failed", i);
+      continue;
+    }
+
+    if ((ai.caps & cap_mask) == 0) {
+      GST_DEBUG_OBJECT (obj, "audio device %d is not an %s device", i,
+          (cap_mask == PCM_CAP_OUTPUT) ? "output" : "input");
+      continue;
+    }
+
+    if (!ai.enabled) {
+      GST_DEBUG_OBJECT (obj, "audio device %d is not usable/enabled", i);
+      continue;
+    }
+
+    GST_DEBUG_OBJECT (obj, "audio device %d looks ok: %s (\"%s\")", i,
+        ai.devnode, ai.name);
+
+    devices = g_list_prepend (devices, g_strdup (ai.devnode));
+  }
+
+  return g_list_reverse (devices);
+}
+
+static GValueArray *
+gst_oss4_property_probe_get_values (GstPropertyProbe * probe,
+    guint prop_id, const GParamSpec * pspec)
+{
+  struct oss_sysinfo si = { {0,}, };
+  GstElementClass *klass;
+  GValueArray *array = NULL;
+  GstObject *obj;
+  GList *devices, *l;
+  int cap_mask, fd = -1;
+
+  if (!g_str_equal (pspec->name, "device")) {
+    G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
+    return NULL;
+  }
+
+  obj = GST_OBJECT (probe);
+
+  GST_OBJECT_LOCK (obj);
+
+  /* figure out whether the element is a source or sink */
+  klass = GST_ELEMENT_GET_CLASS (GST_ELEMENT (probe));
+  if (GST_IS_OSS4_SINK (probe)) {
+    GST_DEBUG_OBJECT (probe, "probing available output devices");
+    cap_mask = PCM_CAP_OUTPUT;
+    fd = GST_OSS4_SINK (probe)->fd;
+  } else if (GST_IS_OSS4_SOURCE (probe)) {
+    GST_DEBUG_OBJECT (probe, "probing available input devices");
+    cap_mask = PCM_CAP_INPUT;
+    fd = GST_OSS4_SOURCE (probe)->fd;
+  } else if (GST_IS_OSS4_MIXER (probe)) {
+    fd = GST_OSS4_MIXER (probe)->fd;
+    cap_mask = 0;
+  } else {
+    GST_OBJECT_UNLOCK (obj);
+    g_return_val_if_reached (NULL);
+  }
+
+  /* copy fd if it's open, so we can just unconditionally close() later */
+  if (fd != -1)
+    fd = dup (fd);
+
+  /* this will also catch the unlikely case where the above dup() failed */
+  if (fd == -1) {
+    fd = open ("/dev/mixer", O_RDONLY | O_NONBLOCK, 0);
+    if (fd < 0)
+      goto open_failed;
+    else if (!gst_oss4_audio_check_version (GST_OBJECT (probe), fd))
+      goto legacy_oss;
+  }
+
+  if (ioctl (fd, SNDCTL_SYSINFO, &si) == -1)
+    goto no_sysinfo;
+
+  if (cap_mask != 0) {
+    devices =
+        gst_oss4_property_probe_get_audio_devices (obj, fd, &si, cap_mask);
+  } else {
+    devices = gst_oss4_property_probe_get_mixer_devices (obj, fd, &si);
+  }
+
+  if (devices == NULL) {
+    GST_DEBUG_OBJECT (obj, "No devices found");
+    goto done;
+  }
+
+  array = g_value_array_new (1);
+
+  for (l = devices; l != NULL; l = l->next) {
+    GValue val = { 0, };
+
+    g_value_init (&val, G_TYPE_STRING);
+    g_value_take_string (&val, (gchar *) l->data);
+    l->data = NULL;
+    g_value_array_append (array, &val);
+    g_value_unset (&val);
+  }
+
+  GST_OBJECT_UNLOCK (obj);
+
+  g_list_free (devices);
+
+done:
+
+  close (fd);
+
+  return array;
+
+/* ERRORS */
+open_failed:
+  {
+    GST_OBJECT_UNLOCK (GST_OBJECT (probe));
+    GST_WARNING_OBJECT (probe, "Can't open file descriptor to probe "
+        "available devices: %s", g_strerror (errno));
+    return NULL;
+  }
+legacy_oss:
+  {
+    close (fd);
+    GST_OBJECT_UNLOCK (GST_OBJECT (probe));
+    GST_DEBUG_OBJECT (probe, "Legacy OSS (ie. not OSSv4), not supported");
+    return NULL;
+  }
+no_sysinfo:
+  {
+    close (fd);
+    GST_OBJECT_UNLOCK (GST_OBJECT (probe));
+    GST_WARNING_OBJECT (probe, "Can't open file descriptor to probe "
+        "available devices: %s", g_strerror (errno));
+    return NULL;
+  }
+}
+
+static void
+gst_oss4_property_probe_interface_init (GstPropertyProbeInterface * iface)
+{
+  iface->get_properties = gst_oss4_property_probe_get_properties;
+  iface->probe_property = gst_oss4_property_probe_probe_property;
+  iface->needs_probe = gst_oss4_property_probe_needs_probe;
+  iface->get_values = gst_oss4_property_probe_get_values;
+}
+
+void
+gst_oss4_add_property_probe_interface (GType type)
+{
+  static const GInterfaceInfo probe_iface_info = {
+    (GInterfaceInitFunc) gst_oss4_property_probe_interface_init,
+    NULL,
+    NULL,
+  };
+
+  g_type_add_interface_static (type, GST_TYPE_PROPERTY_PROBE,
+      &probe_iface_info);
+}