Support IPv6->IPv4 fallback in HTTP streaming.

Bug: 4068057
Change-Id: I425f65a99eb9e0986d9e9c0e264c3c8f61fcfdbd

Author: lcolitti

media/libstagefright/HTTPStream.cpp

@@ -150,31 +150,41 @@ status_t HTTPStream::connect(const char *server, int port) {
     }
 
     CHECK_EQ(mSocket, -1);
-    mSocket = socket(ai[0].ai_family, ai[0].ai_socktype, ai[0].ai_protocol);
 
-    if (mSocket < 0) {
-        freeaddrinfo(ai);
-        return UNKNOWN_ERROR;
-    }
+    mState = CONNECTING;
+    status_t res = -1;
+    struct addrinfo *tmp;
+    for (tmp = ai; tmp; tmp = tmp->ai_next) {
+        mSocket = socket(tmp->ai_family, tmp->ai_socktype, tmp->ai_protocol);
+        if (mSocket < 0) {
+            continue;
+        }
 
-    setReceiveTimeout(30);  // Time out reads after 30 secs by default
+        setReceiveTimeout(30);  // Time out reads after 30 secs by default.
 
-    mState = CONNECTING;
+        int s = mSocket;
 
-    int s = mSocket;
+        mLock.unlock();
 
-    mLock.unlock();
+        res = MyConnect(s, tmp->ai_addr, tmp->ai_addrlen);
 
-    status_t res = MyConnect(s, ai[0].ai_addr, ai[0].ai_addrlen);
+        mLock.lock();
 
-    freeaddrinfo(ai);
+        if (mState != CONNECTING) {
+            close(s);
+            freeaddrinfo(ai);
+            return UNKNOWN_ERROR;
+        }
 
-    mLock.lock();
+        if (res == OK) {
+            break;
+        }
 
-    if (mState != CONNECTING) {
-        return UNKNOWN_ERROR;
+        close(s);
     }
 
+    freeaddrinfo(ai);
+
     if (res != OK) {
         close(mSocket);
         mSocket = -1;