ext/alsa/gstalsa.c: Small code cleanup.

Original commit message from CVS:
* ext/alsa/gstalsa.c: (gst_alsa_detect_rates),
(gst_alsa_detect_channels), (gst_alsa_probe_supported_formats):
Small code cleanup.
* ext/alsa/gstalsamixer.c: (gst_alsa_mixer_open),
(gst_alsa_mixer_new):
Remove hack that always set the device to hw:0*.
Properly find the card name for whatever device was configured.
Do some better debugging.
Fixes #350784.
* ext/alsa/gstalsamixerelement.c:
(gst_alsa_mixer_element_set_property),
(gst_alsa_mixer_element_change_state):
Cleanups.
Handle setting of a NULL device name better.

ChangeLog

@@ -1,3 +1,22 @@
+2006-08-13  Wim Taymans  <wim@fluendo.com>
+
+	* ext/alsa/gstalsa.c: (gst_alsa_detect_rates),
+	(gst_alsa_detect_channels), (gst_alsa_probe_supported_formats):
+	Small code cleanup.
+
+	* ext/alsa/gstalsamixer.c: (gst_alsa_mixer_open),
+	(gst_alsa_mixer_new):
+	Remove hack that always set the device to hw:0*.
+	Properly find the card name for whatever device was configured.
+	Do some better debugging.
+	Fixes #350784.
+
+	* ext/alsa/gstalsamixerelement.c:
+	(gst_alsa_mixer_element_set_property),
+	(gst_alsa_mixer_element_change_state):
+	Cleanups.
+	Handle setting of a NULL device name better.
+
 2006-08-11  Wim Taymans  <wim@fluendo.com>
 
 	* gst/adder/gstadder.c:

ext/alsa/gstalsa.c

@@ -65,6 +65,7 @@ gst_alsa_detect_rates (GstObject * obj, snd_pcm_hw_params_t * hw_params,
 
   return caps;
 
+  /* ERRORS */
 min_rate_err:
   {
     GST_ERROR_OBJECT (obj, "failed to query minimum sample rate: %s",
@@ -328,6 +329,7 @@ gst_alsa_detect_channels (GstObject * obj, snd_pcm_hw_params_t * hw_params,
 
   return caps;
 
+  /* ERRORS */
 min_chan_error:
   {
     GST_ERROR_OBJECT (obj, "failed to query minimum channel count: %s",
@@ -375,12 +377,12 @@ gst_alsa_probe_supported_formats (GstObject * obj, snd_pcm_t * handle,
 
   return caps;
 
+  /* ERRORS */
 error:
   {
     GST_ERROR_OBJECT (obj, "failed to query formats: %s", snd_strerror (err));
     return NULL;
   }
-
 subroutine_error:
   {
     GST_ERROR_OBJECT (obj, "failed to query formats");

ext/alsa/gstalsamixer.c

@@ -44,76 +44,78 @@
 
 
 /* First some utils, then the mixer implementation */
-
 static gboolean
 gst_alsa_mixer_open (GstAlsaMixer * mixer)
 {
-  gint err, devicenum;
+  gint err;
+  snd_ctl_t *ctl;
+  snd_ctl_card_info_t *card_info;
 
   g_return_val_if_fail (mixer->handle == NULL, FALSE);
 
   /* open and initialize the mixer device */
   err = snd_mixer_open (&mixer->handle, 0);
-  if (err < 0 || mixer->handle == NULL) {
+  if (err < 0 || mixer->handle == NULL)
-    GST_WARNING ("Cannot open empty mixer.");
+    goto open_failed;
-    mixer->handle = NULL;
-    return FALSE;
-  }
-
-  /* hack hack hack hack hack!!!!! */
-  if (strncmp (mixer->device, "default", 7) == 0) {
-    /* hack! */
-    g_free (mixer->device);
-    mixer->device = g_strdup ("hw:0");
-  } else if (strncmp (mixer->device, "hw:", 3) == 0) {
-    /* ok */
-  } else if (strncmp (mixer->device, "plughw:", 7) == 0) {
-    gchar *freeme = mixer->device;
-
-    mixer->device = g_strdup (freeme + 4);
-    g_free (freeme);
-  } else {
-    goto error;
-  }
-
-  if (strchr (mixer->device, ','))
-    strchr (mixer->device, ',')[0] = '\0';
 
   if ((err = snd_mixer_attach (mixer->handle, mixer->device)) < 0) {
-    GST_WARNING ("Cannot open mixer for sound device `%s'.", mixer->device);
+    GST_WARNING ("Cannot open mixer for sound device '%s': %s", mixer->device,
+        snd_strerror (err));
     goto error;
   }
 
   if ((err = snd_mixer_selem_register (mixer->handle, NULL, NULL)) < 0) {
-    GST_WARNING ("Cannot register mixer elements.");
+    GST_WARNING ("Cannot register mixer elements: %s", snd_strerror (err));
     goto error;
   }
 
   if ((err = snd_mixer_load (mixer->handle)) < 0) {
-    GST_WARNING ("Cannot load mixer settings.");
+    GST_WARNING ("Cannot load mixer settings: %s", snd_strerror (err));
     goto error;
   }
 
-  /* I don't know how to get a device name from a mixer handle. So on
-   * to the ugly hacks here, then... */
-  if (sscanf (mixer->device, "hw:%d", &devicenum) == 1) {
-    gchar *name;
 
-    if (!snd_card_get_name (devicenum, &name)) {
+  /* now get the device name, any of this is not fatal */
-      mixer->cardname = g_strdup (name);
+  g_free (mixer->cardname);
-      free (name);
+  if ((err = snd_ctl_open (&ctl, mixer->device, 0)) < 0) {
-      GST_DEBUG ("Card name = %s", GST_STR_NULL (mixer->cardname));
+    GST_WARNING ("Cannot open CTL: %s", snd_strerror (err));
-    }
+    goto no_card_name;
   }
 
-  GST_INFO ("Successfully opened mixer for device `%s'.", mixer->device);
+  snd_ctl_card_info_alloca (&card_info);
+  if ((err = snd_ctl_card_info (ctl, card_info)) < 0) {
+    GST_WARNING ("Cannot get card info: %s", snd_strerror (err));
+    snd_ctl_close (ctl);
+    goto no_card_name;
+  }
+
+  mixer->cardname = g_strdup (snd_ctl_card_info_get_name (card_info));
+  GST_DEBUG ("Card name = %s", GST_STR_NULL (mixer->cardname));
+  snd_ctl_close (ctl);
+
+  if (FALSE) {
+  no_card_name:
+    mixer->cardname = g_strdup ("Unknown");
+    GST_DEBUG ("Cannot find card name");
+  }
+
+  GST_INFO ("Successfully opened mixer for device '%s'.", mixer->device);
 
   return TRUE;
 
+  /* ERROR */
+open_failed:
+  {
+    GST_WARNING ("Cannot open mixer: %s", snd_strerror (err));
+    mixer->handle = NULL;
+    return FALSE;
+  }
 error:
-  snd_mixer_close (mixer->handle);
+  {
-  mixer->handle = NULL;
+    snd_mixer_close (mixer->handle);
-  return FALSE;
+    mixer->handle = NULL;
+    return FALSE;
+  }
 }
 
 static void
@@ -230,11 +232,12 @@ gst_alsa_mixer_new (const char *device, GstAlsaMixerDirection dir)
 
   return ret;
 
+  /* ERRORS */
 error:
-  if (ret)
+  {
     gst_alsa_mixer_free (ret);
-
+    return NULL;
-  return NULL;
+  }
 }
 
 void

ext/alsa/gstalsamixerelement.c

@@ -35,7 +35,6 @@ enum
   PROP_DEVICE_NAME
 };
 
-
 static const GstElementDetails gst_alsa_mixer_element_details =
 GST_ELEMENT_DETAILS ("Alsa mixer",
     "Generic/Audio",
@@ -160,6 +159,10 @@ gst_alsa_mixer_element_set_property (GObject * object, guint prop_id,
       GST_OBJECT_LOCK (this);
       g_free (this->device);
       this->device = g_value_dup_string (value);
+      /* make sure we never set NULL, this is nice when we want to open the
+       * device. */
+      if (this->device == NULL)
+        this->device = g_strdup (DEFAULT_PROP_DEVICE);
       GST_OBJECT_UNLOCK (this);
       break;
     }
@@ -208,14 +211,9 @@ gst_alsa_mixer_element_change_state (GstElement * element,
   switch (transition) {
     case GST_STATE_CHANGE_NULL_TO_READY:
       if (!this->mixer) {
-        const gchar *device = (this->device) ? this->device : "default";
+        this->mixer = gst_alsa_mixer_new (this->device, GST_ALSA_MIXER_ALL);
-
+        if (!this->mixer)
-        this->mixer = gst_alsa_mixer_new (device, GST_ALSA_MIXER_ALL);
+          goto open_failed;
-        if (!this->mixer) {
-          GST_ELEMENT_ERROR (element, RESOURCE, OPEN_READ_WRITE, (NULL),
-              ("Failed to open alsa mixer device '%s'", device));
-          return GST_STATE_CHANGE_FAILURE;
-        }
       }
       break;
     default:
@@ -238,4 +236,12 @@ gst_alsa_mixer_element_change_state (GstElement * element,
   }
 
   return ret;
+
+  /* ERRORS */
+open_failed:
+  {
+    GST_ELEMENT_ERROR (element, RESOURCE, OPEN_READ_WRITE, (NULL),
+        ("Failed to open alsa mixer device '%s'", this->device));
+    return GST_STATE_CHANGE_FAILURE;
+  }
 }