From 716df37178bd38eff0b17e141f2f3bb75682ceb4 Mon Sep 17 00:00:00 2001
From: Nathan Caldwell <saintdev@gmail.com>
Date: Thu, 17 Apr 2008 22:39:24 -0600
Subject: [PATCH] Only realloc every 4 tracks. Keep down memory fragmentation a
 little.

---
 src/matroska.h |  1 +
 src/tracks.c   | 10 ++++++++--
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/matroska.h b/src/matroska.h
index f77fa5e..1fc8fb5 100644
--- a/src/matroska.h
+++ b/src/matroska.h
@@ -237,6 +237,7 @@ struct mk_Writer_s {
   uint8_t         wrote_header;
 
   uint8_t         num_tracks;
+  uint8_t         alloc_tracks;
   mk_Track        **tracks_arr;
 
   struct {
diff --git a/src/tracks.c b/src/tracks.c
index 7b8faaf..ab61225 100644
--- a/src/tracks.c
+++ b/src/tracks.c
@@ -27,6 +27,8 @@
 
 /* TODO: Figure out what can actually fail without damaging the track. */
 
+#define TRACK_STEP 4
+
 mk_Track *mk_createTrack(mk_Writer *w, mk_TrackConfig *tc)
 {
   mk_Context *ti, *v;
@@ -35,8 +37,12 @@ mk_Track *mk_createTrack(mk_Writer *w, mk_TrackConfig *tc)
   if (track == NULL)
     return NULL;
 
-  if ((w->tracks_arr = realloc(w->tracks_arr, (w->num_tracks + 1) * sizeof(mk_Track *))) == NULL)
-    return NULL; // FIXME
+  if (w->num_tracks + 1 > w->alloc_tracks)
+  {
+    if ((w->tracks_arr = realloc(w->tracks_arr, (w->alloc_tracks + TRACK_STEP) * sizeof(mk_Track *))) == NULL)
+      return NULL; // FIXME
+    w->alloc_tracks += TRACK_STEP;
+  }
   w->tracks_arr[w->num_tracks] = track;
   track->track_id = ++w->num_tracks;
 
-- 
2.11.4.GIT