Merge of r4383, r4403:

MP4 fixes:

*) Fixed mp4 if first entry in stsc was skipped (ticket #72).

   If first entry in stsc atom was skipped, and seek was to chunk
   boundary, than first_chunk in the generated stsc table wasn't
   set to 1.

*) Fixed handling of mp4 above 2G and 32bit offsets (ticket #84).

src/http/modules/ngx_http_mp4_module.c

diff --git a/src/http/modules/ngx_http_mp4_module.c b/src/http/modules/ngx_http_mp4_module.c
index 3c9f88c..6de7c8f 100644
--- a/src/http/modules/ngx_http_mp4_module.c
+++ b/src/http/modules/ngx_http_mp4_module.c
@@ -165,10 +165,10 @@
     ((u_char *) (p))[7] = n4
 
 #define ngx_mp4_get_32value(p)                                                \
-    ( (((u_char *) (p))[0] << 24)                                             \
-    + (((u_char *) (p))[1] << 16)                                             \
-    + (((u_char *) (p))[2] << 8)                                              \
-    + (((u_char *) (p))[3]) )
+    ( ((uint32_t) ((u_char *) (p))[0] << 24)                                  \
+    + (           ((u_char *) (p))[1] << 16)                                  \
+    + (           ((u_char *) (p))[2] << 8)                                   \
+    + (           ((u_char *) (p))[3]) )
 
 #define ngx_mp4_set_32value(p, n)                                             \
     ((u_char *) (p))[0] = (u_char) ((n) >> 24);                               \
@@ -2382,6 +2382,8 @@
     data->pos = (u_char *) entry;
     atom_size = sizeof(ngx_mp4_stsc_atom_t) + (data->last - data->pos);
 
+    ngx_mp4_set_32value(entry->chunk, 1);
+
     if (trak->chunk_samples) {
 
         first = &trak->stsc_chunk_entry;