2 * Copyright (C) 2017 foo86
4 * This file is part of FFmpeg.
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.
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.
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
21 #ifndef AVCODEC_DOLBY_E_H
22 #define AVCODEC_DOLBY_E_H
27 #define FRAME_SAMPLES 1792
29 #define MAX_PROG_CONF 23
30 #define MAX_PROGRAMS 8
31 #define MAX_CHANNELS 8
34 * @struct DolbyEHeaderInfo
35 * Coded Dolby E header values up to end_gain element, plus derived values.
37 typedef struct DolbyEHeaderInfo {
38 /** @name Coded elements
48 int ch_size[MAX_CHANNELS];
52 int rev_id[MAX_CHANNELS];
53 int begin_gain[MAX_CHANNELS];
54 int end_gain[MAX_CHANNELS];
57 /** @name Derived values
60 int multi_prog_warned;
68 * Dolby E reading context used by decoder and parser.
70 typedef struct DBEContext {
81 DolbyEHeaderInfo metadata;
83 uint8_t buffer[1024 * 3 + AV_INPUT_BUFFER_PADDING_SIZE];
87 * Use the provided key to transform the input into data (put into s->buffer)
88 * suitable for further processing and initialize s->gb to read said data.
90 int ff_dolby_e_convert_input(DBEContext *s, int nb_words, int key);
93 * Initialize DBEContext and parse Dolby E metadata.
94 * Set word_bits/word_bytes, input, input_size, key_present
95 * and parse the header up to the end_gain element.
96 * @param[out] s DBEContext.
97 * @param[in] buf raw input buffer.
98 * @param[in] buf_size must be 3 bytes at least.
99 * @return Returns 0 on success, AVERROR_INVALIDDATA on error
101 int ff_dolby_e_parse_header(DBEContext *s, const uint8_t *buf, int buf_size);