140 lines
4.0 KiB
C
140 lines
4.0 KiB
C
/* GStreamer QuickTime atom parser
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* Copyright (C) 2009 Tim-Philipp Müller <tim centricular net>
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* Copyright (C) <2009> STEricsson <benjamin.gaignard@stericsson.com>
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, 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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static inline gboolean
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qt_atom_parser_has_remaining (GstByteReader * parser, guint64 bytes_needed)
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{
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return G_LIKELY (parser->size >= bytes_needed) &&
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G_LIKELY ((parser->size - bytes_needed) >= parser->byte);
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}
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static inline gboolean
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qt_atom_parser_has_chunks (GstByteReader * parser, guint32 n_chunks,
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guint32 chunk_size)
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{
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/* assumption: n_chunks and chunk_size are 32-bit, we cast to 64-bit here
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* to avoid overflows, to handle e.g. (guint32)-1 * size correctly */
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return qt_atom_parser_has_remaining (parser, (guint64) n_chunks * chunk_size);
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}
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static inline gboolean
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qt_atom_parser_peek_sub (GstByteReader * parser, guint offset, guint size,
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GstByteReader * sub)
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{
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*sub = *parser;
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if (G_UNLIKELY (!gst_byte_reader_skip (sub, offset)))
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return FALSE;
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return (gst_byte_reader_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 (GstByteReader * parser,
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guint bytes_to_skip, guint32 * val)
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{
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if (G_UNLIKELY (gst_byte_reader_get_remaining (parser) < (bytes_to_skip + 4)))
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return FALSE;
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gst_byte_reader_skip_unchecked (parser, bytes_to_skip);
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*val = gst_byte_reader_get_uint32_be_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 (GstByteReader * parser, guint off_size,
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guint64 * val)
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{
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if (G_UNLIKELY (gst_byte_reader_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 = gst_byte_reader_get_uint64_be_unchecked (parser);
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} else {
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*val = gst_byte_reader_get_uint32_be_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 (GstByteReader * parser, guint off_size)
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{
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if (off_size == sizeof (guint64)) {
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return gst_byte_reader_get_uint64_be_unchecked (parser);
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} else {
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return gst_byte_reader_get_uint32_be_unchecked (parser);
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}
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}
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/* size must be from 1 to 4 */
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static inline guint32
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qt_atom_parser_get_uint_with_size_unchecked (GstByteReader * parser,
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guint size)
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{
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switch (size) {
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case 1:
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return gst_byte_reader_get_uint8_unchecked (parser);
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case 2:
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return gst_byte_reader_get_uint16_be_unchecked (parser);
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case 3:
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return gst_byte_reader_get_uint24_be_unchecked (parser);
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case 4:
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return gst_byte_reader_get_uint32_be_unchecked (parser);
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default:
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g_assert_not_reached ();
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gst_byte_reader_skip_unchecked (parser, size);
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break;
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}
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return 0;
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}
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static inline gboolean
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qt_atom_parser_get_fourcc (GstByteReader * parser, guint32 * fourcc)
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{
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guint32 f_be;
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if (G_UNLIKELY (gst_byte_reader_get_remaining (parser) < 4))
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return FALSE;
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f_be = gst_byte_reader_get_uint32_be_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 (GstByteReader * parser)
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{
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guint32 fourcc;
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fourcc = gst_byte_reader_get_uint32_be_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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