1 /*
2 * AC-3 parser internal code
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #ifndef AVCODEC_AC3_PARSER_INTERNAL_H
22 #define AVCODEC_AC3_PARSER_INTERNAL_H
23
24 #include <stddef.h>
25 #include <stdint.h>
26
29
30 /**
31 * @struct AC3HeaderInfo
32 * Coded AC-3 header values up to the lfeon element, plus derived values.
33 */
35 /** @name Coded elements
36 * @{
37 */
52 /** @} */
53
54 /** @name Derived values
55 * @{
56 */
64 /** @} */
66
67 /**
68 * Parse AC-3 frame header.
69 * Parse the header up to the lfeon element, which is the first 52 or 54 bits
70 * depending on the audio coding mode.
71 * @param[in] gbc BitContext containing the first 54 bits of the frame.
72 * @param[out] hdr Pointer to struct where header info is written.
73 * @return Returns 0 on success, -1 if there is a sync word mismatch,
74 * -2 if the bsid (version) element is invalid, -3 if the fscod (sample rate)
75 * element is invalid, or -4 if the frmsizecod (bit rate) element is invalid.
76 */
78
81
83
84 #endif /* AVCODEC_AC3_PARSER_INTERNAL_H */