sys/oss/gstosssrc.*: Cache probed caps, so _get_caps() during recording doesn't cause ioctl calls which may disrupt t...

Original commit message from CVS:
Patch by: Mark Nauwelaerts <manauw skynet be>
* sys/oss/gstosssrc.c: (gst_oss_src_init), (gst_oss_src_getcaps),
(gst_oss_src_close):
* sys/oss/gstosssrc.h:
Cache probed caps, so _get_caps() during recording doesn't cause
ioctl calls which may disrupt the recording (fixes #521875).

2 files changed, 20 insertions, 4 deletions

diff --git a/sys/oss/gstosssrc.c b/sys/oss/gstosssrc.c
index 36aa92dd..417bdcf0 100644
--- a/sys/oss/gstosssrc.c
+++ b/sys/oss/gstosssrc.c
@@ -243,6 +243,7 @@ gst_oss_src_init (GstOssSrc * osssrc, GstOssSrcClass * g_class)
   osssrc->fd = -1;
   osssrc->device = g_strdup (device);
   osssrc->device_name = g_strdup (DEFAULT_DEVICE_NAME);
+  osssrc->probed_caps = NULL;
 }
 
 static void
@@ -263,12 +264,23 @@ gst_oss_src_getcaps (GstBaseSrc * bsrc)
   osssrc = GST_OSS_SRC (bsrc);
 
   if (osssrc->fd == -1) {
-    caps = gst_caps_copy (gst_pad_get_pad_template_caps (GST_BASE_SRC_PAD
-            (bsrc)));
-  } else {
-    caps = gst_oss_helper_probe_caps (osssrc->fd);
+    GST_DEBUG_OBJECT (osssrc, "device not open, using template caps");
+    return NULL;                /* base class will get template caps for us */
   }
 
+  if (osssrc->probed_caps) {
+    GST_LOG_OBJECT (osssrc, "Returning cached caps");
+    return gst_caps_ref (osssrc->probed_caps);
+  }
+
+  caps = gst_oss_helper_probe_caps (osssrc->fd);
+
+  if (caps) {
+    osssrc->probed_caps = gst_caps_ref (caps);
+  }
+
+  GST_INFO_OBJECT (osssrc, "returning caps %" GST_PTR_FORMAT, caps);
+
   return caps;
 }
 
@@ -395,6 +407,8 @@ gst_oss_src_close (GstAudioSrc * asrc)
     oss->mixer = NULL;
   }
 
+  gst_caps_replace (&oss->probed_caps, NULL);
+
   return TRUE;
 }
 
diff --git a/sys/oss/gstosssrc.h b/sys/oss/gstosssrc.h
index 17662985..0d146133 100644
--- a/sys/oss/gstosssrc.h
+++ b/sys/oss/gstosssrc.h
@@ -51,6 +51,8 @@ struct _GstOssSrc {
   gchar *device;
   gchar *device_name;
 
+  GstCaps       *probed_caps;
+
   GstOssMixer *mixer;
 };