qtdemux: add QtAtomParser, an inlined GstByteReader variant

gst/qtdemux/Makefile.am

@@ -10,6 +10,7 @@ libgstqtdemux_la_SOURCES = quicktime.c gstrtpxqtdepay.c qtdemux.c qtdemux_types.
 libgstqtdemux_la_LIBTOOLFLAGS = --tag=disable-static
 
 noinst_HEADERS = \
+	qtatomparser.h   \
 	qtdemux.h        \
 	qtdemux_types.h  \
 	qtdemux_dump.h   \

gst/qtdemux/qtatomparser.h

@@ -0,0 +1,125 @@
+/* GStreamer QuickTime atom parser
+ * Copyright (C) 2009 Tim-Philipp Müller <tim centricular net>
+ *
+ * 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef QT_ATOM_PARSER_H
+#define QT_ATOM_PARSER_H
+
+#include <gst/base/gstbytereader.h>
+
+/* our inlined version of GstByteReader */
+
+typedef GstByteReader QtAtomParser;
+
+static inline void
+qt_atom_parser_init (QtAtomParser * parser, const guint8 * data, guint size)
+{
+  gst_byte_reader_init (parser, data, size);
+}
+
+static inline guint
+qt_atom_parser_get_remaining (QtAtomParser * parser)
+{
+  return parser->size - parser->byte;
+}
+
+static inline gboolean
+qt_atom_parser_skip (QtAtomParser * parser, guint nbytes)
+{
+  if (G_UNLIKELY (qt_atom_parser_get_remaining (parser) < nbytes))
+    return FALSE;
+
+  parser->byte += nbytes;
+  return TRUE;
+}
+
+static inline void
+qt_atom_parser_skip_unchecked (QtAtomParser * parser, guint nbytes)
+{
+  parser->byte += nbytes;
+}
+
+#ifndef GST_READ_UINT8_BE
+#define GST_READ_UINT8_BE GST_READ_UINT8
+#endif
+
+#define _QT_ATOM_PARSER_GET_PEEK_BITS(bits,typebits) \
+static inline gboolean \
+qt_atom_parser_get_uint##bits (QtAtomParser * parser, guint##typebits * val)  \
+{ \
+  if (G_UNLIKELY (qt_atom_parser_get_remaining (parser) < (bits / 8))) \
+    return FALSE; \
+  *val = GST_READ_UINT##bits##_BE (parser->data + parser->byte);  \
+  parser->byte += bits / 8; \
+  return TRUE; \
+} \
+\
+static inline gboolean \
+qt_atom_parser_peek_uint##bits (QtAtomParser * parser, guint##typebits * val)  \
+{ \
+  if (G_UNLIKELY (qt_atom_parser_get_remaining (parser) < (bits / 8))) \
+    return FALSE; \
+  *val = GST_READ_UINT##bits##_BE (parser->data + parser->byte);  \
+  return TRUE; \
+} \
+\
+static inline guint##typebits \
+qt_atom_parser_get_uint##bits##_unchecked (QtAtomParser * parser)  \
+{ \
+  guint##typebits val = GST_READ_UINT##bits##_BE (parser->data + parser->byte);  \
+  parser->byte += bits / 8; \
+  return val; \
+} \
+\
+static inline guint##typebits \
+qt_atom_parser_peek_uint##bits##_unchecked (QtAtomParser * parser)  \
+{ \
+  return GST_READ_UINT##bits##_BE (parser->data + parser->byte);  \
+}
+
+_QT_ATOM_PARSER_GET_PEEK_BITS(8,8);
+_QT_ATOM_PARSER_GET_PEEK_BITS(16,16);
+_QT_ATOM_PARSER_GET_PEEK_BITS(24,32);
+_QT_ATOM_PARSER_GET_PEEK_BITS(32,32);
+_QT_ATOM_PARSER_GET_PEEK_BITS(64,64);
+
+static inline gboolean
+qt_atom_parser_peek_sub (QtAtomParser * parser, guint offset, guint size,
+    QtAtomParser * sub)
+{
+  *sub = *parser;
+
+  if (G_UNLIKELY (!gst_byte_reader_skip (sub, offset)))
+    return FALSE;
+
+  return (gst_byte_reader_get_remaining (sub) >= size);
+}
+
+static inline gboolean
+qt_atom_parser_skipn_and_get_uint32 (QtAtomParser * parser,
+    guint bytes_to_skip, guint32 * val)
+{
+  if (G_UNLIKELY (qt_atom_parser_get_remaining (parser) < (bytes_to_skip + 4)))
+    return FALSE;
+
+  qt_atom_parser_skip_unchecked (parser, bytes_to_skip);
+  *val = qt_atom_parser_get_uint32_unchecked (parser);
+  return TRUE;
+}
+
+#endif /* QT_ATOM_PARSER_H */

gst/qtdemux/qtdemux.c

@@ -49,6 +49,7 @@
 
 #include <gst/tag/tag.h>
 
+#include "qtatomparser.h"
 #include "qtdemux_types.h"
 #include "qtdemux_dump.h"
 #include "qtdemux_fourcc.h"