From ab0d1bc942447cb4bd02be606ef6e7629c97c9a7 Mon Sep 17 00:00:00 2001
From: Wim Taymans <wim.taymans@collabora.co.uk>
Date: Thu, 30 Apr 2009 18:41:44 +0200
Subject: [PATCH] qtdemux: micro optimize qtdemux a little

Sprinkle some G_LIKELY around.

Avoid traversing and dumping the tree when debugging is not activated.
---
 gst/qtdemux/qtdemux.c       | 29 +++++++++++++++--------------
 gst/qtdemux/qtdemux_dump.c  |  3 +++
 gst/qtdemux/qtdemux_types.c |  3 ++-
 3 files changed, 20 insertions(+), 15 deletions(-)

diff --git a/gst/qtdemux/qtdemux.c b/gst/qtdemux/qtdemux.c
index d18d4dfc83..4be965e47c 100644
--- a/gst/qtdemux/qtdemux.c
+++ b/gst/qtdemux/qtdemux.c
@@ -318,7 +318,7 @@ gst_qtdemux_get_type (void)
 {
   static GType qtdemux_type = 0;
 
-  if (!qtdemux_type) {
+  if (G_UNLIKELY (!qtdemux_type)) {
     static const GTypeInfo qtdemux_info = {
       sizeof (GstQTDemuxClass),
       (GBaseInitFunc) gst_qtdemux_base_init, NULL,
@@ -2891,24 +2891,24 @@ static gboolean
 qtdemux_parse_container (GstQTDemux * qtdemux, GNode * node, guint8 * buf,
     guint8 * end)
 {
-  while (buf < end) {
+  while (G_UNLIKELY (buf < end)) {
     GNode *child;
     guint32 len;
 
-    if (buf + 4 > end) {
+    if (G_UNLIKELY (buf + 4 > end)) {
       GST_LOG_OBJECT (qtdemux, "buffer overrun");
       break;
     }
     len = QT_UINT32 (buf);
-    if (len == 0) {
+    if (G_UNLIKELY (len == 0)) {
       GST_LOG_OBJECT (qtdemux, "empty container");
       break;
     }
-    if (len < 8) {
+    if (G_UNLIKELY (len < 8)) {
       GST_WARNING_OBJECT (qtdemux, "length too short (%d < 8)", len);
       break;
     }
-    if (len > (end - buf)) {
+    if (G_UNLIKELY (len > (end - buf))) {
       GST_WARNING_OBJECT (qtdemux, "length too long (%d > %d)", len, end - buf);
       break;
     }
@@ -2997,12 +2997,12 @@ qtdemux_parse_node (GstQTDemux * qtdemux, GNode * node, guint8 * buffer,
   node_length = QT_UINT32 (buffer);
   fourcc = QT_FOURCC (buffer + 4);
 
-  type = qtdemux_type_get (fourcc);
-
   /* ignore empty nodes */
-  if (fourcc == 0 || node_length == 8)
+  if (G_UNLIKELY (fourcc == 0 || node_length == 8))
     return TRUE;
 
+  type = qtdemux_type_get (fourcc);
+
   end = buffer + length;
 
   GST_LOG_OBJECT (qtdemux,
@@ -3143,7 +3143,7 @@ qtdemux_tree_get_child_by_type (GNode * node, guint32 fourcc)
 
     child_fourcc = QT_FOURCC (buffer + 4);
 
-    if (child_fourcc == fourcc) {
+    if (G_UNLIKELY (child_fourcc == fourcc)) {
       return child;
     }
   }
@@ -3379,10 +3379,6 @@ qtdemux_parse_samples (GstQTDemux * qtdemux, QtDemuxStream * stream,
   if (!(stts = qtdemux_tree_get_child_by_type (stbl, FOURCC_stts)))
     goto corrupt_file;
 
-  /* sample sync, can be NULL */
-  stss = qtdemux_tree_get_child_by_type (stbl, FOURCC_stss);
-  stps = qtdemux_tree_get_child_by_type (stbl, FOURCC_stps);
-
   sample_size = QT_UINT32 (stsz_data + 12);
   if (sample_size == 0 || stream->sampled) {
     n_samples = QT_UINT32 (stsz_data + 16);
@@ -3465,6 +3461,10 @@ qtdemux_parse_samples (GstQTDemux * qtdemux, QtDemuxStream * stream,
         index++;
       }
     }
+
+    /* sample sync, can be NULL */
+    stss = qtdemux_tree_get_child_by_type (stbl, FOURCC_stss);
+
     if (stss) {
       /* mark keyframes */
       guint32 n_sample_syncs;
@@ -3483,6 +3483,7 @@ qtdemux_parse_samples (GstQTDemux * qtdemux, QtDemuxStream * stream,
           }
         }
       }
+      stps = qtdemux_tree_get_child_by_type (stbl, FOURCC_stps);
       if (stps) {
         /* mark keyframes */
         guint32 n_sample_syncs;
diff --git a/gst/qtdemux/qtdemux_dump.c b/gst/qtdemux/qtdemux_dump.c
index 506a3f7ea5..7871609ca4 100644
--- a/gst/qtdemux/qtdemux_dump.c
+++ b/gst/qtdemux/qtdemux_dump.c
@@ -431,6 +431,9 @@ qtdemux_node_dump_foreach (GNode * node, gpointer qtdemux)
 void
 qtdemux_node_dump (GstQTDemux * qtdemux, GNode * node)
 {
+  if (__gst_debug_min < GST_LEVEL_LOG)
+    return;
+
   g_node_traverse (qtdemux->moov_node, G_PRE_ORDER, G_TRAVERSE_ALL, -1,
       qtdemux_node_dump_foreach, qtdemux);
 }
diff --git a/gst/qtdemux/qtdemux_types.c b/gst/qtdemux/qtdemux_types.c
index d2b7e5a7dd..ef79d1d26b 100644
--- a/gst/qtdemux/qtdemux_types.c
+++ b/gst/qtdemux/qtdemux_types.c
@@ -146,11 +146,12 @@ qtdemux_type_get (guint32 fourcc)
   int i;
 
   for (i = 0; i < n_qt_node_types; i++) {
-    if (qt_node_types[i].fourcc == fourcc)
+    if (G_UNLIKELY (qt_node_types[i].fourcc == fourcc))
       return qt_node_types + i;
   }
 
   GST_WARNING ("unknown QuickTime node type %" GST_FOURCC_FORMAT,
       GST_FOURCC_ARGS (fourcc));
+
   return qt_node_types + n_qt_node_types - 1;
 }