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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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179 lines
4.9 KiB
C
179 lines
4.9 KiB
C
/* GStreamer QuickTime atom parser
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* Copyright (C) 2009 Tim-Philipp Müller <tim centricular net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef QT_ATOM_PARSER_H
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#define QT_ATOM_PARSER_H
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#include <gst/base/gstbytereader.h>
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/* our inlined version of GstByteReader */
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typedef GstByteReader QtAtomParser;
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static inline void
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qt_atom_parser_init (QtAtomParser * parser, const guint8 * data, guint size)
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{
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gst_byte_reader_init (parser, data, size);
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}
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static inline guint
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qt_atom_parser_get_remaining (QtAtomParser * parser)
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{
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return parser->size - parser->byte;
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}
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static inline gboolean
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qt_atom_parser_skip (QtAtomParser * parser, guint nbytes)
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{
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if (G_UNLIKELY (qt_atom_parser_get_remaining (parser) < nbytes))
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return FALSE;
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parser->byte += nbytes;
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return TRUE;
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}
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static inline void
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qt_atom_parser_skip_unchecked (QtAtomParser * parser, guint nbytes)
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{
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parser->byte += nbytes;
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}
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#ifndef GST_READ_UINT8_BE
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#define GST_READ_UINT8_BE GST_READ_UINT8
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#endif
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#define _QT_ATOM_PARSER_GET_PEEK_BITS(bits,typebits) \
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static inline gboolean \
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qt_atom_parser_get_uint##bits (QtAtomParser * parser, guint##typebits * val) \
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{ \
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if (G_UNLIKELY (qt_atom_parser_get_remaining (parser) < (bits / 8))) \
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return FALSE; \
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*val = GST_READ_UINT##bits##_BE (parser->data + parser->byte); \
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parser->byte += bits / 8; \
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return TRUE; \
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} \
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\
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static inline gboolean \
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qt_atom_parser_peek_uint##bits (QtAtomParser * parser, guint##typebits * val) \
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{ \
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if (G_UNLIKELY (qt_atom_parser_get_remaining (parser) < (bits / 8))) \
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return FALSE; \
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*val = GST_READ_UINT##bits##_BE (parser->data + parser->byte); \
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return TRUE; \
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} \
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\
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static inline guint##typebits \
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qt_atom_parser_get_uint##bits##_unchecked (QtAtomParser * parser) \
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{ \
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guint##typebits val = GST_READ_UINT##bits##_BE (parser->data + parser->byte); \
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parser->byte += bits / 8; \
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return val; \
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} \
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\
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static inline guint##typebits \
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qt_atom_parser_peek_uint##bits##_unchecked (QtAtomParser * parser) \
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{ \
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return GST_READ_UINT##bits##_BE (parser->data + parser->byte); \
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}
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_QT_ATOM_PARSER_GET_PEEK_BITS(8,8);
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_QT_ATOM_PARSER_GET_PEEK_BITS(16,16);
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_QT_ATOM_PARSER_GET_PEEK_BITS(24,32);
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_QT_ATOM_PARSER_GET_PEEK_BITS(32,32);
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_QT_ATOM_PARSER_GET_PEEK_BITS(64,64);
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static inline gboolean
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qt_atom_parser_peek_sub (QtAtomParser * parser, guint offset, guint size,
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QtAtomParser * sub)
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{
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*sub = *parser;
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if (G_UNLIKELY (!qt_atom_parser_skip (sub, offset)))
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return FALSE;
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return (qt_atom_parser_get_remaining (sub) >= size);
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}
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static inline gboolean
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qt_atom_parser_skipn_and_get_uint32 (QtAtomParser * parser,
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guint bytes_to_skip, guint32 * val)
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{
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if (G_UNLIKELY (qt_atom_parser_get_remaining (parser) < (bytes_to_skip + 4)))
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return FALSE;
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qt_atom_parser_skip_unchecked (parser, bytes_to_skip);
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*val = qt_atom_parser_get_uint32_unchecked (parser);
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return TRUE;
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}
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/* off_size must be either 4 or 8 */
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static inline gboolean
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qt_atom_parser_get_offset (QtAtomParser * parser, guint off_size, guint64 * val)
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{
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if (G_UNLIKELY (qt_atom_parser_get_remaining (parser) < off_size))
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return FALSE;
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if (off_size == sizeof (guint64)) {
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*val = qt_atom_parser_get_uint64_unchecked (parser);
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} else {
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*val = qt_atom_parser_get_uint32_unchecked (parser);
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}
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return TRUE;
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}
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/* off_size must be either 4 or 8 */
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static inline guint64
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qt_atom_parser_get_offset_unchecked (QtAtomParser * parser, guint off_size)
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{
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if (off_size == sizeof (guint64)) {
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return qt_atom_parser_get_uint64_unchecked (parser);
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} else {
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return qt_atom_parser_get_uint32_unchecked (parser);
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}
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}
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static inline guint8 *
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qt_atom_parser_peek_bytes_unchecked (QtAtomParser * parser)
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{
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return (guint8 *) parser->data + parser->byte;
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}
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static inline gboolean
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qt_atom_parser_get_fourcc (QtAtomParser * parser, guint32 * fourcc)
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{
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guint32 f_be;
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if (G_UNLIKELY (qt_atom_parser_get_remaining (parser) < 4))
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return FALSE;
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f_be = qt_atom_parser_get_uint32_unchecked (parser);
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*fourcc = GUINT32_SWAP_LE_BE (f_be);
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return TRUE;
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}
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static inline guint32
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qt_atom_parser_get_fourcc_unchecked (QtAtomParser * parser)
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{
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guint32 fourcc;
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fourcc = qt_atom_parser_get_uint32_unchecked (parser);
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return GUINT32_SWAP_LE_BE (fourcc);
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}
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#endif /* QT_ATOM_PARSER_H */
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