Changeset 1058 for pjproject/trunk/pjmedia/src/pjmedia/sdp_neg.c

Timestamp:

Mar 13, 2007 1:10:27 PM (17 years ago)

Author:

bennylp

Message:

Fixed ticket #172: SDP media direction negotiation bug (thanks Phil Torre)

File:

• pjproject/trunk/pjmedia/src/pjmedia/sdp_neg.c (modified) (1 diff)

pjproject/trunk/pjmedia/src/pjmedia/sdp_neg.c

@@ -369 +369 @@
                                    pjmedia_sdp_media *local)
 {
-   if (pjmedia_sdp_media_find_attr2(remote, "inactive", NULL) != NULL) {
+    pjmedia_dir old_dir = PJMEDIA_DIR_ENCODING_DECODING,
+                new_dir;
+
+    /* Get the media direction of local SDP */
+    if (pjmedia_sdp_media_find_attr2(local, "sendonly", NULL))
+        old_dir = PJMEDIA_DIR_ENCODING;
+    else if (pjmedia_sdp_media_find_attr2(local, "recvonly", NULL))
+        old_dir = PJMEDIA_DIR_DECODING;
+    else if (pjmedia_sdp_media_find_attr2(local, "inactive", NULL))
+        old_dir = PJMEDIA_DIR_NONE;
+
+    new_dir = old_dir;
+
+    /* Adjust local media direction based on remote media direction */
+    if (pjmedia_sdp_media_find_attr2(remote, "inactive", NULL) != NULL) {
         /* If remote has "a=inactive", then local is inactive too */
 
-        pjmedia_sdp_attr *a;
-
-        remove_all_media_directions(local);
-
-        a = pjmedia_sdp_attr_create(pool, "inactive", NULL);
-        pjmedia_sdp_media_add_attr(local, a);
+        new_dir = PJMEDIA_DIR_NONE;
 
     } else if(pjmedia_sdp_media_find_attr2(remote, "sendonly", NULL) != NULL) {
         /* If remote has "a=sendonly", then set local to "recvonly" if
-         * it is currently "sendrecv".
+         * it is currently "sendrecv". Otherwise if local is NOT "recvonly",
+         * then set local direction to "inactive".
+         */
+        switch (old_dir) {
+        case PJMEDIA_DIR_ENCODING_DECODING:
+            new_dir = PJMEDIA_DIR_DECODING;
+            break;
+        case PJMEDIA_DIR_DECODING:
+            /* No change */
+            break;
+        default:
+            new_dir = PJMEDIA_DIR_NONE;
+            break;
+        }
+
+    } else if(pjmedia_sdp_media_find_attr2(remote, "recvonly", NULL) != NULL) {
+        /* If remote has "a=recvonly", then set local to "sendonly" if
+         * it is currently "sendrecv". Otherwise if local is NOT "sendonly",
+         * then set local direction to "inactive"
          */
     
-        pjmedia_sdp_attr *a;
+        switch (old_dir) {
+        case PJMEDIA_DIR_ENCODING_DECODING:
+            new_dir = PJMEDIA_DIR_ENCODING;
+            break;
+        case PJMEDIA_DIR_ENCODING:
+            /* No change */
+            break;
+        default:
+            new_dir = PJMEDIA_DIR_NONE;
+            break;
+        }
+
+    } else {
+        /* Remote indicates "sendrecv" capability. No change to local 
+         * direction 
+         */
+    }
+
+    if (new_dir != old_dir) {
+        pjmedia_sdp_attr *a = NULL;
 
         remove_all_media_directions(local);
 
-        a = pjmedia_sdp_attr_create(pool, "recvonly", NULL);
-        pjmedia_sdp_media_add_attr(local, a);
-
-    } else if(pjmedia_sdp_media_find_attr2(remote, "recvonly", NULL) != NULL) {
-        /* If remote has "a=recvonly", then set local to "sendonly" if
-         * it is currently "sendrecv".
-         */
-    
-        pjmedia_sdp_attr *a;
-
-        remove_all_media_directions(local);
-
-        a = pjmedia_sdp_attr_create(pool, "sendonly", NULL);
-        pjmedia_sdp_media_add_attr(local, a);
-
-    } else if(pjmedia_sdp_media_find_attr2(remote, "sendrecv", NULL) != NULL) {
-
-        pjmedia_sdp_attr *a;
-
-        remove_all_media_directions(local);
-
-        a = pjmedia_sdp_attr_create(pool, "sendrecv", NULL);
-        pjmedia_sdp_media_add_attr(local, a);
-
-    } else {
-        /* Otherwise remote is set to "sendrecv".
-         */
-        remove_all_media_directions(local);
+        switch (new_dir) {
+        case PJMEDIA_DIR_NONE:
+            a = pjmedia_sdp_attr_create(pool, "inactive", NULL);
+            break;
+        case PJMEDIA_DIR_ENCODING:
+            a = pjmedia_sdp_attr_create(pool, "sendonly", NULL);
+            break;
+        case PJMEDIA_DIR_DECODING:
+            a = pjmedia_sdp_attr_create(pool, "recvonly", NULL);
+            break;
+        default:
+            /* sendrecv */
+            break;
+        }
+        
+        if (a) {
+            pjmedia_sdp_media_add_attr(local, a);
+        }
     }
 }