From af40a978c17343987b1f0fd9ececf9285cfdbcee Mon Sep 17 00:00:00 2001
From: Mike Brady <mikebrady@eircom.net>
Date: Tue, 27 May 2014 08:16:02 +0100
Subject: [PATCH] Begin adding 'device busy' status.

---
 rtsp.c | 122 ++++++++++++++++++++++++++++++++++-----------------------
 1 file changed, 73 insertions(+), 49 deletions(-)

diff --git a/rtsp.c b/rtsp.c
index c40a3d73..7c2398a3 100644
--- a/rtsp.c
+++ b/rtsp.c
@@ -52,6 +52,11 @@
 #define INETx_ADDRSTRLEN INET_ADDRSTRLEN
 #endif
 
+// Mike Brady's part...
+static pthread_mutex_t play_lock = PTHREAD_MUTEX_INITIALIZER;
+static int is_playing = 0;
+
+
 // only one thread is allowed to use the player at once.
 // it monitors the request variable (at least when interrupted)
 static pthread_mutex_t playing_mutex = PTHREAD_MUTEX_INITIALIZER;
@@ -418,7 +423,7 @@ static void handle_setup(rtsp_conn_info *conn,
     if (config.userSuppliedLatency==0) {
       char * ua = msg_get_header(req,"User-Agent");
       if (!ua) {
-        debug(1,"No User-Agent string found in the SETUP message and no user-supplied latency. Using AirP;ay latency of %d frames.",config.AirPlayLatency);
+        debug(1,"No User-Agent string found in the SETUP message and no user-supplied latency. Using AirPlay latency of %d frames.",config.AirPlayLatency);
         return;
       }
       if (strstr(ua,"iTunes")==ua) {
@@ -469,6 +474,7 @@ static void handle_setup(rtsp_conn_info *conn,
     	if (q++)
     		strcat(hdr,q); // should unsplice the timing port entry
     }
+    
     player_play(&conn->stream);
 
     char *resphdr = malloc(200);
@@ -515,60 +521,73 @@ static void handle_set_parameter(rtsp_conn_info *conn,
 
 static void handle_announce(rtsp_conn_info *conn,
                             rtsp_message *req, rtsp_message *resp) {
+    if (pthread_mutex_trylock(&play_lock) == 0) {
+      char *paesiv = NULL;
+      char *prsaaeskey = NULL;
+      char *pfmtp = NULL;
+      char *cp = req->content;
+      int cp_left = req->contentlength;
+      char *next;
+      while (cp_left && cp) {
+          next = nextline(cp, cp_left);
+          cp_left -= next-cp;
 
-    char *paesiv = NULL;
-    char *prsaaeskey = NULL;
-    char *pfmtp = NULL;
-    char *cp = req->content;
-    int cp_left = req->contentlength;
-    char *next;
-    while (cp_left && cp) {
-        next = nextline(cp, cp_left);
-        cp_left -= next-cp;
+          if (!strncmp(cp, "a=fmtp:", 7))
+              pfmtp = cp+7;
 
-        if (!strncmp(cp, "a=fmtp:", 7))
-            pfmtp = cp+7;
+          if (!strncmp(cp, "a=aesiv:", 8))
+              paesiv = cp+8;
 
-        if (!strncmp(cp, "a=aesiv:", 8))
-            paesiv = cp+8;
+          if (!strncmp(cp, "a=rsaaeskey:", 12))
+              prsaaeskey = cp+12;
 
-        if (!strncmp(cp, "a=rsaaeskey:", 12))
-            prsaaeskey = cp+12;
+          cp = next;
+      }
 
-        cp = next;
+      if (!paesiv || !prsaaeskey || !pfmtp) {
+          warn("required params missing from announce");
+          return;
+      }
+
+      int len, keylen;
+      uint8_t *aesiv = base64_dec(paesiv, &len);
+      if (len != 16) {
+          warn("client announced aeskey of %d bytes, wanted 16", len);
+          free(aesiv);
+          return;
+      }
+      memcpy(conn->stream.aesiv, aesiv, 16);
+      free(aesiv);
+
+      uint8_t *rsaaeskey = base64_dec(prsaaeskey, &len);
+      uint8_t *aeskey = rsa_apply(rsaaeskey, len, &keylen, RSA_MODE_KEY);
+      free(rsaaeskey);
+      if (keylen != 16) {
+          warn("client announced rsaaeskey of %d bytes, wanted 16", keylen);
+          free(aeskey);
+          return;
+      }
+      memcpy(conn->stream.aeskey, aeskey, 16);
+      free(aeskey);
+
+      int i;
+      for (i=0; i<sizeof(conn->stream.fmtp)/sizeof(conn->stream.fmtp[0]); i++)
+          conn->stream.fmtp[i] = atoi(strsep(&pfmtp, " \t"));
+      
+      char *hdr = msg_get_header(req, "X-Apple-Client-Name");
+      if (hdr)
+        debug(1,"Announcement from \"%s\".",hdr);
+      else {
+        hdr = msg_get_header(req, "User-Agent");
+        if (hdr)
+          debug(1,"Announcement from \"%s\".",hdr);
+      }
+
+      resp->respcode = 200;
+    } else {
+      resp->respcode = 453;
+      debug(1,"Already playing.");
     }
-
-    if (!paesiv || !prsaaeskey || !pfmtp) {
-        warn("required params missing from announce");
-        return;
-    }
-
-    int len, keylen;
-    uint8_t *aesiv = base64_dec(paesiv, &len);
-    if (len != 16) {
-        warn("client announced aeskey of %d bytes, wanted 16", len);
-        free(aesiv);
-        return;
-    }
-    memcpy(conn->stream.aesiv, aesiv, 16);
-    free(aesiv);
-
-    uint8_t *rsaaeskey = base64_dec(prsaaeskey, &len);
-    uint8_t *aeskey = rsa_apply(rsaaeskey, len, &keylen, RSA_MODE_KEY);
-    free(rsaaeskey);
-    if (keylen != 16) {
-        warn("client announced rsaaeskey of %d bytes, wanted 16", keylen);
-        free(aeskey);
-        return;
-    }
-    memcpy(conn->stream.aeskey, aeskey, 16);
-    free(aeskey);
-
-    int i;
-    for (i=0; i<sizeof(conn->stream.fmtp)/sizeof(conn->stream.fmtp[0]); i++)
-        conn->stream.fmtp[i] = atoi(strsep(&pfmtp, " \t"));
-
-    resp->respcode = 200;
 }
 
 
@@ -769,7 +788,11 @@ static void *rtsp_conversation_thread_func(void *pconn) {
         struct method_handler *mh;
         for (mh=method_handlers; mh->method; mh++) {
             if (!strcmp(mh->method, req->method)) {
+                debug(1,"RTSP Packet received of type \"%s\":",mh->method),
+                msg_print_debug_headers(req);
                 mh->handler(conn, req, resp);
+                debug(1,"RTSP Response:");
+                 msg_print_debug_headers(resp);
                 break;
             }
         }
@@ -786,6 +809,7 @@ respond:
     if (rtsp_playing()) {
         rtp_shutdown();
         player_stop();
+        pthread_mutex_unlock(&play_lock);
         please_shutdown = 0;
         pthread_mutex_unlock(&playing_mutex);
     }