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/* 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 */
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