[aravis] gv_stream: frame_id can never be 0

[Emmanuel Pacaud <emmanuel src gnome org>]

commit cbe0886a5c012b36ca2a10694662d2337f121330
Author: Emmanuel Pacaud <emmanuel gnome org>
Date:   Sun Oct 5 16:05:35 2014 +0200

    gv_stream: frame_id can never be 0
    
    Take that into account when computing frame_id_inc.

 src/arvgvstream.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/src/arvgvstream.c b/src/arvgvstream.c
index 7108344..073ce0e 100644
--- a/src/arvgvstream.c
+++ b/src/arvgvstream.c
@@ -35,6 +35,7 @@
 #include <arvenumtypes.h>
 #include <string.h>
 #include <sys/socket.h>
+#include <stdio.h>
 
 #define ARV_GV_STREAM_INCOMING_BUFFER_SIZE     65536
 
@@ -314,6 +315,9 @@ _find_frame_data (ArvGvStreamThreadData *thread_data,
        }
 
        frame_id_inc = (gint16) frame_id - (gint16) thread_data->last_frame_id;
+       /* Frame id 0 is not a valid value */
+       if ((gint16) frame_id > 0 && (gint16) thread_data->last_frame_id < 0)
+               frame_id_inc--;
        if (frame_id_inc < 1  && frame_id_inc > -ARV_GV_STREAM_DISCARD_LATE_FRAME_THRESHOLD) {
                arv_debug_stream_thread ("[GvStream::_find_frame_data] Discard late frame %u (last: %u)",
                                         frame_id, thread_data->last_frame_id);