1 /*
2 * Audio and Video frame extraction
3 * Copyright (c) 2003 Fabrice Bellard
4 * Copyright (c) 2003 Michael Niedermayer
5 * Copyright (c) 2009 Alex Converse
6 *
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
29
31 {
32 int size, rdb, ch, sr;
33 int aot, crc_abs;
34
35 memset(hdr, 0, sizeof(*hdr));
36
39
42 crc_abs =
get_bits1(gbc);
/* protection_absent */
43 aot =
get_bits(gbc, 2);
/* profile_objecttype */
44 sr =
get_bits(gbc, 4);
/* sample_frequency_index */
48 ch =
get_bits(gbc, 3);
/* channel_configuration */
49
52
53 /* adts_variable_header */
54 skip_bits1(gbc);
/* copyright_identification_bit */
55 skip_bits1(gbc);
/* copyright_identification_start */
59
60 skip_bits(gbc, 11);
/* adts_buffer_fullness */
61 rdb =
get_bits(gbc, 2);
/* number_of_raw_data_blocks_in_frame */
62
69 hdr->
samples = (rdb + 1) * 1024;
72
74 }
75
78 {
83 }