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/*
* Copyright (C) 2017 foo86
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_DOLBY_E_H
#define AVCODEC_DOLBY_E_H
#include <stdint.h>
#include "get_bits.h"
#define FRAME_SAMPLES 1792
#define MAX_PROG_CONF 23
#define MAX_PROGRAMS 8
#define MAX_CHANNELS 8
/**
* @struct DolbyEHeaderInfo
* Coded Dolby E header values up to end_gain element, plus derived values.
*/
typedef struct DolbyEHeaderInfo {
/** @name Coded elements
* @{
*/
int prog_conf;
int nb_channels;
int nb_programs;
int fr_code;
int fr_code_orig;
int ch_size[MAX_CHANNELS];
int mtd_ext_size;
int meter_size;
int rev_id[MAX_CHANNELS];
int begin_gain[MAX_CHANNELS];
int end_gain[MAX_CHANNELS];
/** @} */
/** @name Derived values
* @{
*/
int multi_prog_warned;
int output_channel_order;
int sample_rate;
/** @} */
} DolbyEHeaderInfo;
/**
* @struct DBEContext
* Dolby E reading context used by decoder and parser.
*/
typedef struct DBEContext {
void *avctx;
GetBitContext gb;
const uint8_t *input;
int input_size;
int word_bits;
int word_bytes;
int key_present;
DolbyEHeaderInfo metadata;
uint8_t buffer[1024 * 3 + AV_INPUT_BUFFER_PADDING_SIZE];
} DBEContext;
/**
* Use the provided key to transform the input into data (put into s->buffer)
* suitable for further processing and initialize s->gb to read said data.
*/
int ff_dolby_e_convert_input(DBEContext *s, int nb_words, int key);
/**
* Initialize DBEContext and parse Dolby E metadata.
* Set word_bits/word_bytes, input, input_size, key_present
* and parse the header up to the end_gain element.
* @param[out] s DBEContext.
* @param[in] buf raw input buffer.
* @param[in] buf_size must be 3 bytes at least.
* @return Returns 0 on success, AVERROR_INVALIDDATA on error
*/
int ff_dolby_e_parse_header(DBEContext *s, const uint8_t *buf, int buf_size);
#endif
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