qtdemux: Move some tree parsing files out to a separate file.

Reduce a tiny bit of the bulk of qtdemux.c by moving some
agnostic helper functions out.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/634>

gst/isomp4/meson.build

@@ -5,6 +5,7 @@ mp4_sources = [
   'qtdemux_types.c',
   'qtdemux_dump.c',
   'qtdemux_lang.c',
+  'qtdemux_tree.c',
   'gstisoff.c',
   'gstqtmux.c',
   'gstqtmoovrecover.c',

gst/isomp4/qtdemux.c

@@ -68,6 +68,7 @@
 #include "qtdemux_lang.h"
 #include "qtdemux.h"
 #include "qtpalette.h"
+#include "qtdemux_tree.h"
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -488,13 +489,6 @@ qt_demux_state_string (enum QtDemuxState state)
   }
 }
 
-static GNode *qtdemux_tree_get_child_by_type (GNode * node, guint32 fourcc);
-static GNode *qtdemux_tree_get_child_by_type_full (GNode * node,
-    guint32 fourcc, GstByteReader * parser);
-static GNode *qtdemux_tree_get_sibling_by_type (GNode * node, guint32 fourcc);
-static GNode *qtdemux_tree_get_sibling_by_type_full (GNode * node,
-    guint32 fourcc, GstByteReader * parser);
-
 static GstFlowReturn qtdemux_add_fragmented_samples (GstQTDemux * qtdemux);
 
 static void gst_qtdemux_check_send_pending_segment (GstQTDemux * demux);
@@ -8340,92 +8334,6 @@ broken_atom_size:
   }
 }
 
-static GNode *
-qtdemux_tree_get_child_by_type (GNode * node, guint32 fourcc)
-{
-  GNode *child;
-  guint8 *buffer;
-  guint32 child_fourcc;
-
-  for (child = g_node_first_child (node); child;
-      child = g_node_next_sibling (child)) {
-    buffer = (guint8 *) child->data;
-
-    child_fourcc = QT_FOURCC (buffer + 4);
-
-    if (G_UNLIKELY (child_fourcc == fourcc)) {
-      return child;
-    }
-  }
-  return NULL;
-}
-
-static GNode *
-qtdemux_tree_get_child_by_type_full (GNode * node, guint32 fourcc,
-    GstByteReader * parser)
-{
-  GNode *child;
-  guint8 *buffer;
-  guint32 child_fourcc, child_len;
-
-  for (child = g_node_first_child (node); child;
-      child = g_node_next_sibling (child)) {
-    buffer = (guint8 *) child->data;
-
-    child_len = QT_UINT32 (buffer);
-    child_fourcc = QT_FOURCC (buffer + 4);
-
-    if (G_UNLIKELY (child_fourcc == fourcc)) {
-      if (G_UNLIKELY (child_len < (4 + 4)))
-        return NULL;
-      /* FIXME: must verify if atom length < parent atom length */
-      gst_byte_reader_init (parser, buffer + (4 + 4), child_len - (4 + 4));
-      return child;
-    }
-  }
-  return NULL;
-}
-
-static GNode *
-qtdemux_tree_get_child_by_index (GNode * node, guint index)
-{
-  return g_node_nth_child (node, index);
-}
-
-static GNode *
-qtdemux_tree_get_sibling_by_type_full (GNode * node, guint32 fourcc,
-    GstByteReader * parser)
-{
-  GNode *child;
-  guint8 *buffer;
-  guint32 child_fourcc, child_len;
-
-  for (child = g_node_next_sibling (node); child;
-      child = g_node_next_sibling (child)) {
-    buffer = (guint8 *) child->data;
-
-    child_fourcc = QT_FOURCC (buffer + 4);
-
-    if (child_fourcc == fourcc) {
-      if (parser) {
-        child_len = QT_UINT32 (buffer);
-        if (G_UNLIKELY (child_len < (4 + 4)))
-          return NULL;
-        /* FIXME: must verify if atom length < parent atom length */
-        gst_byte_reader_init (parser, buffer + (4 + 4), child_len - (4 + 4));
-      }
-      return child;
-    }
-  }
-  return NULL;
-}
-
-static GNode *
-qtdemux_tree_get_sibling_by_type (GNode * node, guint32 fourcc)
-{
-  return qtdemux_tree_get_sibling_by_type_full (node, fourcc, NULL);
-}
-
 static void
 qtdemux_do_allocation (QtDemuxStream * stream, GstQTDemux * qtdemux)
 {

gst/isomp4/qtdemux_tree.c

@@ -0,0 +1,122 @@
+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ * Copyright (C) <2003> David A. Schleef <ds@schleef.org>
+ * Copyright (C) <2006> Wim Taymans <wim@fluendo.com>
+ * Copyright (C) <2007> Julien Moutte <julien@fluendo.com>
+ * Copyright (C) <2009> Tim-Philipp Müller <tim centricular net>
+ * Copyright (C) <2009> STEricsson <benjamin.gaignard@stericsson.com>
+ * Copyright (C) <2013> Sreerenj Balachandran <sreerenj.balachandran@intel.com>
+ * Copyright (C) <2013> Intel Corporation
+ * Copyright (C) <2014> Centricular Ltd
+ * Copyright (C) <2015> YouView TV Ltd.
+ * Copyright (C) <2016> British Broadcasting Corporation
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "qtdemux_tree.h"
+#include "qtdemux_types.h"
+#include "fourcc.h"
+
+GNode *
+qtdemux_tree_get_child_by_type (GNode * node, guint32 fourcc)
+{
+  GNode *child;
+  guint8 *buffer;
+  guint32 child_fourcc;
+
+  for (child = g_node_first_child (node); child;
+      child = g_node_next_sibling (child)) {
+    buffer = (guint8 *) child->data;
+
+    child_fourcc = QT_FOURCC (buffer + 4);
+
+    if (G_UNLIKELY (child_fourcc == fourcc)) {
+      return child;
+    }
+  }
+  return NULL;
+}
+
+GNode *
+qtdemux_tree_get_child_by_type_full (GNode * node, guint32 fourcc,
+    GstByteReader * parser)
+{
+  GNode *child;
+  guint8 *buffer;
+  guint32 child_fourcc, child_len;
+
+  for (child = g_node_first_child (node); child;
+      child = g_node_next_sibling (child)) {
+    buffer = (guint8 *) child->data;
+
+    child_len = QT_UINT32 (buffer);
+    child_fourcc = QT_FOURCC (buffer + 4);
+
+    if (G_UNLIKELY (child_fourcc == fourcc)) {
+      if (G_UNLIKELY (child_len < (4 + 4)))
+        return NULL;
+      /* FIXME: must verify if atom length < parent atom length */
+      gst_byte_reader_init (parser, buffer + (4 + 4), child_len - (4 + 4));
+      return child;
+    }
+  }
+  return NULL;
+}
+
+GNode *
+qtdemux_tree_get_child_by_index (GNode * node, guint index)
+{
+  return g_node_nth_child (node, index);
+}
+
+GNode *
+qtdemux_tree_get_sibling_by_type_full (GNode * node, guint32 fourcc,
+    GstByteReader * parser)
+{
+  GNode *child;
+  guint8 *buffer;
+  guint32 child_fourcc, child_len;
+
+  for (child = g_node_next_sibling (node); child;
+      child = g_node_next_sibling (child)) {
+    buffer = (guint8 *) child->data;
+
+    child_fourcc = QT_FOURCC (buffer + 4);
+
+    if (child_fourcc == fourcc) {
+      if (parser) {
+        child_len = QT_UINT32 (buffer);
+        if (G_UNLIKELY (child_len < (4 + 4)))
+          return NULL;
+        /* FIXME: must verify if atom length < parent atom length */
+        gst_byte_reader_init (parser, buffer + (4 + 4), child_len - (4 + 4));
+      }
+      return child;
+    }
+  }
+  return NULL;
+}
+
+GNode *
+qtdemux_tree_get_sibling_by_type (GNode * node, guint32 fourcc)
+{
+  return qtdemux_tree_get_sibling_by_type_full (node, fourcc, NULL);
+}

gst/isomp4/qtdemux_tree.h

@@ -0,0 +1,47 @@
+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ * Copyright (C) <2003> David A. Schleef <ds@schleef.org>
+ * Copyright (C) <2006> Wim Taymans <wim@fluendo.com>
+ * Copyright (C) <2007> Julien Moutte <julien@fluendo.com>
+ * Copyright (C) <2009> Tim-Philipp Müller <tim centricular net>
+ * Copyright (C) <2009> STEricsson <benjamin.gaignard@stericsson.com>
+ * Copyright (C) <2013> Sreerenj Balachandran <sreerenj.balachandran@intel.com>
+ * Copyright (C) <2013> Intel Corporation
+ * Copyright (C) <2014> Centricular Ltd
+ * Copyright (C) <2015> YouView TV Ltd.
+ * Copyright (C) <2016> British Broadcasting Corporation
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+#include <gst/gst.h>
+#include <gst/base/gstbytereader.h>
+
+#ifndef __QTDEMUX_TREE_H__
+#define __QTDEMUX_TREE_H__
+
+G_BEGIN_DECLS
+
+GNode *qtdemux_tree_get_child_by_type (GNode * node, guint32 fourcc);
+GNode *qtdemux_tree_get_child_by_type_full (GNode * node,
+    guint32 fourcc, GstByteReader * parser);
+GNode *qtdemux_tree_get_sibling_by_type (GNode * node, guint32 fourcc);
+GNode *qtdemux_tree_get_sibling_by_type_full (GNode * node,
+    guint32 fourcc, GstByteReader * parser);
+GNode *qtdemux_tree_get_child_by_index (GNode * node, guint index);
+
+G_END_DECLS
+
+#endif