rtpopusdepay: Assume 48 kHz if sprop-maxcapturerate is missing

This matches 7587, section 6.1:

>   sprop-maxcapturerate:  a hint about the maximum input sampling rate
>      [...]
>      bandwidths (Table 1).  By default, the sender is assumed to have
>      no limitations, i.e., 48000.

Fixes: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/2354
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4172>

diff --git a/subprojects/gst-plugins-good/gst/rtp/gstrtpopusdepay.c b/subprojects/gst-plugins-good/gst/rtp/gstrtpopusdepay.c
index d20dd7d..220f5c0 100644 (file)
--- a/subprojects/gst-plugins-good/gst/rtp/gstrtpopusdepay.c
+++ b/subprojects/gst-plugins-good/gst/rtp/gstrtpopusdepay.c
@@ -100,6 +100,8 @@ gst_rtp_opus_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
   GstStructure *s;
   gboolean ret;
   const gchar *sprop_maxcapturerate;
+  /* Default unless overridden by sprop_maxcapturerate */
+  gint rate = 48000;
 
   srccaps = gst_caps_new_empty_simple ("audio/x-opus");
 
@@ -215,19 +217,22 @@ gst_rtp_opus_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
 
   if ((sprop_maxcapturerate =
           gst_structure_get_string (s, "sprop-maxcapturerate"))) {
-    gulong rate;
     gchar *tailptr;
+    gulong tmp_rate;
 
-    rate = strtoul (sprop_maxcapturerate, &tailptr, 10);
-    if (rate > INT_MAX || *tailptr != '\0') {
+    tmp_rate = strtoul (sprop_maxcapturerate, &tailptr, 10);
+    if (tmp_rate > INT_MAX || *tailptr != '\0') {
       GST_WARNING_OBJECT (depayload,
           "Failed to parse sprop-maxcapturerate value '%s'",
           sprop_maxcapturerate);
     } else {
-      gst_caps_set_simple (srccaps, "rate", G_TYPE_INT, rate, NULL);
+      /* Valid rate from sprop, let's use it */
+      rate = tmp_rate;
     }
   }
 
+  gst_caps_set_simple (srccaps, "rate", G_TYPE_INT, rate, NULL);
+
   ret = gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depayload), srccaps);
 
   GST_DEBUG_OBJECT (depayload,