mikey: add new function gst_mikey_message_to_caps

gst-libs/gst/sdp/gstmikey.c

@@ -2299,6 +2299,142 @@ no_key:
   return NULL;
 }
 
+#define AES_128_KEY_LEN 16
+#define AES_256_KEY_LEN 32
+#define HMAC_32_KEY_LEN 4
+#define HMAC_80_KEY_LEN 10
+
+/**
+ * gst_mikey_message_to_caps:
+ * @msg: a #GstMIKEYMessage
+ * @caps: a #GstCaps to be filled with SRTP parameters (srtp/srtcp cipher, authorization, key data)
+ *
+ * Returns: %TRUE on success
+ *
+ * Since: 1.10
+ */
+gboolean
+gst_mikey_message_to_caps (const GstMIKEYMessage * msg, GstCaps * caps)
+{
+  gboolean res = FALSE;
+  const GstMIKEYPayload *payload;
+  const gchar *srtp_cipher;
+  const gchar *srtp_auth;
+
+  srtp_cipher = "aes-128-icm";
+  srtp_auth = "hmac-sha1-80";
+
+  /* check the Security policy if any */
+  if ((payload = gst_mikey_message_find_payload (msg, GST_MIKEY_PT_SP, 0))) {
+    GstMIKEYPayloadSP *p = (GstMIKEYPayloadSP *) payload;
+    guint len, i;
+
+    if (p->proto != GST_MIKEY_SEC_PROTO_SRTP)
+      goto done;
+
+    len = gst_mikey_payload_sp_get_n_params (payload);
+    for (i = 0; i < len; i++) {
+      const GstMIKEYPayloadSPParam *param =
+          gst_mikey_payload_sp_get_param (payload, i);
+
+      switch (param->type) {
+        case GST_MIKEY_SP_SRTP_ENC_ALG:
+          switch (param->val[0]) {
+            case 0:
+              srtp_cipher = "null";
+              break;
+            case 2:
+            case 1:
+              srtp_cipher = "aes-128-icm";
+              break;
+            default:
+              break;
+          }
+          break;
+        case GST_MIKEY_SP_SRTP_ENC_KEY_LEN:
+          switch (param->val[0]) {
+            case AES_128_KEY_LEN:
+              srtp_cipher = "aes-128-icm";
+              break;
+            case AES_256_KEY_LEN:
+              srtp_cipher = "aes-256-icm";
+              break;
+            default:
+              break;
+          }
+          break;
+        case GST_MIKEY_SP_SRTP_AUTH_ALG:
+          switch (param->val[0]) {
+            case 0:
+              srtp_auth = "null";
+              break;
+            case 2:
+            case 1:
+              srtp_auth = "hmac-sha1-80";
+              break;
+            default:
+              break;
+          }
+          break;
+        case GST_MIKEY_SP_SRTP_AUTH_KEY_LEN:
+          switch (param->val[0]) {
+            case HMAC_32_KEY_LEN:
+              srtp_auth = "hmac-sha1-32";
+              break;
+            case HMAC_80_KEY_LEN:
+              srtp_auth = "hmac-sha1-80";
+              break;
+            default:
+              break;
+          }
+          break;
+        case GST_MIKEY_SP_SRTP_SRTP_ENC:
+          break;
+        case GST_MIKEY_SP_SRTP_SRTCP_ENC:
+          break;
+        default:
+          break;
+      }
+    }
+  }
+
+  if (!(payload = gst_mikey_message_find_payload (msg, GST_MIKEY_PT_KEMAC, 0)))
+    goto done;
+  else {
+    GstMIKEYPayloadKEMAC *p = (GstMIKEYPayloadKEMAC *) payload;
+    const GstMIKEYPayload *sub;
+    GstMIKEYPayloadKeyData *pkd;
+    GstBuffer *buf;
+
+    if (p->enc_alg != GST_MIKEY_ENC_NULL || p->mac_alg != GST_MIKEY_MAC_NULL)
+      goto done;
+
+    if (!(sub = gst_mikey_payload_kemac_get_sub (payload, 0)))
+      goto done;
+
+    if (sub->type != GST_MIKEY_PT_KEY_DATA)
+      goto done;
+
+    pkd = (GstMIKEYPayloadKeyData *) sub;
+    buf =
+        gst_buffer_new_wrapped (g_memdup (pkd->key_data, pkd->key_len),
+        pkd->key_len);
+    gst_caps_set_simple (caps, "srtp-key", GST_TYPE_BUFFER, buf, NULL);
+    gst_buffer_unref (buf);
+  }
+
+  gst_caps_set_simple (caps,
+      "srtp-cipher", G_TYPE_STRING, srtp_cipher,
+      "srtp-auth", G_TYPE_STRING, srtp_auth,
+      "srtcp-cipher", G_TYPE_STRING, srtp_cipher,
+      "srtcp-auth", G_TYPE_STRING, srtp_auth, NULL);
+
+  res = TRUE;
+
+done:
+  return res;
+}
+
 /**
  * gst_mikey_message_base64_encode:
  * @msg: a #GstMIKEYMessage

gst-libs/gst/sdp/gstmikey.h

@@ -547,7 +547,8 @@ GstMIKEYMessage *           gst_mikey_message_new_from_bytes    (GBytes *bytes,
                                                                  GError **error);
 GBytes *                    gst_mikey_message_to_bytes          (GstMIKEYMessage *msg, GstMIKEYEncryptInfo *info,
                                                                  GError **error);
-GstMIKEYMessage *           gst_mikey_message_new_from_caps         (GstCaps *caps);
+GstMIKEYMessage *           gst_mikey_message_new_from_caps     (GstCaps *caps);
+gboolean                    gst_mikey_message_to_caps           (const GstMIKEYMessage *msg, GstCaps *caps);
 gchar *                     gst_mikey_message_base64_encode     (GstMIKEYMessage* msg);
 
 /**
@@ -665,4 +666,3 @@ G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstMIKEYPayload, gst_mikey_payload_unref)
 G_END_DECLS
 
 #endif /* __GST_MIKEY_H__ */
-

gst-libs/gst/sdp/gstsdpmessage.c

@@ -3619,11 +3619,6 @@ gst_sdp_make_keymgmt (const gchar * uri, const gchar * base64)
   return g_strdup_printf ("prot=mikey;uri=\"%s\";data=\"%s\"", uri, base64);
 }
 
-#define AES_128_KEY_LEN 16
-#define AES_256_KEY_LEN 32
-#define HMAC_32_KEY_LEN 4
-#define HMAC_80_KEY_LEN 10
-
 static gboolean
 gst_sdp_parse_keymgmt (const gchar * keymgmt, GstCaps * caps)
 {
@@ -3631,9 +3626,6 @@ gst_sdp_parse_keymgmt (const gchar * keymgmt, GstCaps * caps)
   gsize size;
   guchar *data;
   GstMIKEYMessage *msg;
-  const GstMIKEYPayload *payload;
-  const gchar *srtp_cipher;
-  const gchar *srtp_auth;
   gchar *orig_value;
   gchar *p, *kmpid;
 
@@ -3661,116 +3653,7 @@ gst_sdp_parse_keymgmt (const gchar * keymgmt, GstCaps * caps)
   if (msg == NULL)
     return FALSE;
 
-  srtp_cipher = "aes-128-icm";
+  res = gst_mikey_message_to_caps (msg, caps);
-  srtp_auth = "hmac-sha1-80";
-
-  /* check the Security policy if any */
-  if ((payload = gst_mikey_message_find_payload (msg, GST_MIKEY_PT_SP, 0))) {
-    GstMIKEYPayloadSP *p = (GstMIKEYPayloadSP *) payload;
-    guint len, i;
-
-    if (p->proto != GST_MIKEY_SEC_PROTO_SRTP)
-      goto done;
-
-    len = gst_mikey_payload_sp_get_n_params (payload);
-    for (i = 0; i < len; i++) {
-      const GstMIKEYPayloadSPParam *param =
-          gst_mikey_payload_sp_get_param (payload, i);
-
-      switch (param->type) {
-        case GST_MIKEY_SP_SRTP_ENC_ALG:
-          switch (param->val[0]) {
-            case 0:
-              srtp_cipher = "null";
-              break;
-            case 2:
-            case 1:
-              srtp_cipher = "aes-128-icm";
-              break;
-            default:
-              break;
-          }
-          break;
-        case GST_MIKEY_SP_SRTP_ENC_KEY_LEN:
-          switch (param->val[0]) {
-            case AES_128_KEY_LEN:
-              srtp_cipher = "aes-128-icm";
-              break;
-            case AES_256_KEY_LEN:
-              srtp_cipher = "aes-256-icm";
-              break;
-            default:
-              break;
-          }
-          break;
-        case GST_MIKEY_SP_SRTP_AUTH_ALG:
-          switch (param->val[0]) {
-            case 0:
-              srtp_auth = "null";
-              break;
-            case 2:
-            case 1:
-              srtp_auth = "hmac-sha1-80";
-              break;
-            default:
-              break;
-          }
-          break;
-        case GST_MIKEY_SP_SRTP_AUTH_KEY_LEN:
-          switch (param->val[0]) {
-            case HMAC_32_KEY_LEN:
-              srtp_auth = "hmac-sha1-32";
-              break;
-            case HMAC_80_KEY_LEN:
-              srtp_auth = "hmac-sha1-80";
-              break;
-            default:
-              break;
-          }
-          break;
-        case GST_MIKEY_SP_SRTP_SRTP_ENC:
-          break;
-        case GST_MIKEY_SP_SRTP_SRTCP_ENC:
-          break;
-        default:
-          break;
-      }
-    }
-  }
-
-  if (!(payload = gst_mikey_message_find_payload (msg, GST_MIKEY_PT_KEMAC, 0)))
-    goto done;
-  else {
-    GstMIKEYPayloadKEMAC *p = (GstMIKEYPayloadKEMAC *) payload;
-    const GstMIKEYPayload *sub;
-    GstMIKEYPayloadKeyData *pkd;
-    GstBuffer *buf;
-
-    if (p->enc_alg != GST_MIKEY_ENC_NULL || p->mac_alg != GST_MIKEY_MAC_NULL)
-      goto done;
-
-    if (!(sub = gst_mikey_payload_kemac_get_sub (payload, 0)))
-      goto done;
-
-    if (sub->type != GST_MIKEY_PT_KEY_DATA)
-      goto done;
-
-    pkd = (GstMIKEYPayloadKeyData *) sub;
-    buf =
-        gst_buffer_new_wrapped (g_memdup (pkd->key_data, pkd->key_len),
-        pkd->key_len);
-    gst_caps_set_simple (caps, "srtp-key", GST_TYPE_BUFFER, buf, NULL);
-    gst_buffer_unref (buf);
-  }
-
-  gst_caps_set_simple (caps,
-      "srtp-cipher", G_TYPE_STRING, srtp_cipher,
-      "srtp-auth", G_TYPE_STRING, srtp_auth,
-      "srtcp-cipher", G_TYPE_STRING, srtp_cipher,
-      "srtcp-auth", G_TYPE_STRING, srtp_auth, NULL);
-
-  res = TRUE;
-done:
   gst_mikey_message_unref (msg);
 
   return res;