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106 lines
2.8 KiB
C
106 lines
2.8 KiB
C
/*
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* Copyright (C) 2017 foo86
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_DOLBY_E_H
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#define AVCODEC_DOLBY_E_H
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#include <stdint.h>
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#include "get_bits.h"
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#define FRAME_SAMPLES 1792
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#define MAX_PROG_CONF 23
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#define MAX_PROGRAMS 8
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#define MAX_CHANNELS 8
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/**
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* @struct DolbyEHeaderInfo
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* Coded Dolby E header values up to end_gain element, plus derived values.
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*/
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typedef struct DolbyEHeaderInfo {
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/** @name Coded elements
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* @{
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*/
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int prog_conf;
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int nb_channels;
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int nb_programs;
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int fr_code;
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int fr_code_orig;
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int ch_size[MAX_CHANNELS];
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int mtd_ext_size;
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int meter_size;
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int rev_id[MAX_CHANNELS];
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int begin_gain[MAX_CHANNELS];
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int end_gain[MAX_CHANNELS];
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/** @} */
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/** @name Derived values
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* @{
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*/
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int multi_prog_warned;
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int output_channel_order;
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int sample_rate;
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/** @} */
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} DolbyEHeaderInfo;
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/**
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* @struct DBEContext
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* Dolby E reading context used by decoder and parser.
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*/
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typedef struct DBEContext {
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void *avctx;
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GetBitContext gb;
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const uint8_t *input;
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int input_size;
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int word_bits;
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int word_bytes;
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int key_present;
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DolbyEHeaderInfo metadata;
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uint8_t buffer[1024 * 3 + AV_INPUT_BUFFER_PADDING_SIZE];
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} DBEContext;
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/**
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* Use the provided key to transform the input into data (put into s->buffer)
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* suitable for further processing and initialize s->gb to read said data.
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*/
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int ff_dolby_e_convert_input(DBEContext *s, int nb_words, int key);
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/**
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* Initialize DBEContext and parse Dolby E metadata.
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* Set word_bits/word_bytes, input, input_size, key_present
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* and parse the header up to the end_gain element.
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* @param[out] s DBEContext.
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* @param[in] buf raw input buffer.
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* @param[in] buf_size must be 3 bytes at least.
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* @return Returns 0 on success, AVERROR_INVALIDDATA on error
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*/
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int ff_dolby_e_parse_header(DBEContext *s, const uint8_t *buf, int buf_size);
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#endif
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