Bug 888789 - Update nestegg with VP9 and Opus support. r=kinetik

Update our in-tree source to the upstream master branch.

media/libnestegg/README_MOZILLA

@@ -5,4 +5,4 @@ Makefile.in build files for the Mozilla build system.
 
 The nestegg git repository is: git://github.com/kinetiknz/nestegg.git
 
-The git commit ID used was 7d0f6d22b5a332ce47b95bc19dc259f204d339e1.
+The git commit ID used was 26d262114af191b6654cbd5d24ec02e4b6bdb1cd.

media/libnestegg/include/nestegg.h

@@ -67,6 +67,8 @@ extern "C" {
 
 #define NESTEGG_CODEC_VP8    0 /**< Track uses Google On2 VP8 codec. */
 #define NESTEGG_CODEC_VORBIS 1 /**< Track uses Xiph Vorbis codec. */
+#define NESTEGG_CODEC_VP9    2 /**< Track uses Google On2 VP9 codec. */
+#define NESTEGG_CODEC_OPUS   3 /**< Track uses Xiph Opus codec. */
 
 #define NESTEGG_VIDEO_MONO              0 /**< Track is mono video. */
 #define NESTEGG_VIDEO_STEREO_LEFT_RIGHT 1 /**< Track is side-by-side stereo video.  Left first. */

media/libnestegg/src/macros.h

@@ -20,7 +20,7 @@
 /*
  	restore pointer to the structure by a pointer to its field
  */
-#define structof(p,t,f) ((t*)(- offsetof(t,f) + (char*)(p)))
+#define structof(p,t,f) ((t*)(- (ptrdiff_t) offsetof(t,f) + (char*)(p)))
 
 /*
  *	redefine for the target compiler

media/libnestegg/src/nestegg.c

@@ -128,7 +128,9 @@ enum ebml_type_enum {
 
 /* Track IDs */
 #define TRACK_ID_VP8            "V_VP8"
+#define TRACK_ID_VP9            "V_VP9"
 #define TRACK_ID_VORBIS         "A_VORBIS"
+#define TRACK_ID_OPUS           "A_OPUS"
 
 enum vint_mask {
   MASK_NONE,
@@ -1422,9 +1424,8 @@ ne_find_cue_position_for_track(nestegg * ctx, struct ebml_list_node * node, unsi
     if (ne_map_track_number_to_index(ctx, track_number, &t) != 0)
       return NULL;
 
-    if (t == track) {
+    if (t == track)
       return pos;
-    }
 
     node = node->next;
   }
@@ -1550,9 +1551,9 @@ ne_buffer_read(void * buffer, size_t length, void * user_data)
   int rv = 1;
   size_t available = sb->length - sb->offset;
 
-  if (available < length) {
+  if (available < length)
     return 0;
-  }
+
   memcpy(buffer, sb->buffer + sb->offset, length);
   sb->offset += length;
 
@@ -1577,9 +1578,8 @@ ne_buffer_seek(int64_t offset, int whence, void * user_data)
       break;
   }
 
-  if (o < 0 || o > (int64_t) sb->length) {
+  if (o < 0 || o > (int64_t) sb->length)
     return -1;
-  }
 
   sb->offset = o;
   return 0;
@@ -1933,9 +1933,15 @@ nestegg_track_codec_id(nestegg * ctx, unsigned int track)
   if (strcmp(codec_id, TRACK_ID_VP8) == 0)
     return NESTEGG_CODEC_VP8;
 
+  if (strcmp(codec_id, TRACK_ID_VP9) == 0)
+    return NESTEGG_CODEC_VP9;
+
   if (strcmp(codec_id, TRACK_ID_VORBIS) == 0)
     return NESTEGG_CODEC_VORBIS;
 
+  if (strcmp(codec_id, TRACK_ID_OPUS) == 0)
+    return NESTEGG_CODEC_OPUS;
+
   return -1;
 }