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105 lines
2.8 KiB
105 lines
2.8 KiB
/* |
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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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