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136 lines
3.8 KiB
136 lines
3.8 KiB
/*****************************************************************************
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* aac.h: ISO/IEC 14496-3 Advanced Audio Coding
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*****************************************************************************
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* Copyright (C) 2010 VideoLAN
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*
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* Authors: Christophe Massiot <massiot@via.ecp.fr>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject
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* to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*****************************************************************************/
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/*
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* Normative references:
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* - ISO/IEC 14496-3 Subpart 4:1998(E)
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* (Advanced Audio Coding, Time/Frequency Coding)
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*/
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#ifndef __BITSTREAM_MPEG_AAC_H__
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#define __BITSTREAM_MPEG_AAC_H__
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#include <stdint.h> /* uint8_t, uint16_t, etc... */
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#include <stdbool.h> /* bool */
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/*****************************************************************************
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* ADTS header
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*****************************************************************************/
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#define ADTS_HEADER_SIZE 7
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/* fixed header */
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static inline void adts_set_sync(uint8_t *p_adts)
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{
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p_adts[0] = 0xff;
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p_adts[1] = 0xf9; /* protection absent */
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p_adts[2] = 0x0;
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p_adts[3] = 0x0;
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p_adts[4] = 0x0;
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p_adts[5] = 0x0;
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p_adts[6] = 0x0;
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}
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static inline void adts_set_profile(uint8_t *p_adts, uint8_t i_profile)
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{
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p_adts[2] &= ~0xc0;
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p_adts[2] |= i_profile << 6;
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}
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static inline void adts_set_index(uint8_t *p_adts, uint8_t i_index)
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{
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p_adts[2] &= ~0x3c;
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p_adts[2] |= (i_index & 0xf) << 2;
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}
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static inline void adts_set_channels(uint8_t *p_adts, uint8_t i_channels)
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{
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p_adts[2] &= ~0x03; /* also clear out the private bit */
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p_adts[2] |= (i_channels & 0x7) >> 2;
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p_adts[3] &= ~0xc0;
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p_adts[3] |= (i_channels & 0x7) << 6;
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}
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static inline void adts_set_copy(uint8_t *p_adts, bool b_copy)
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{
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if (!b_copy)
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p_adts[3] &= ~0x20;
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else
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p_adts[3] |= 0x20;
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}
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static inline void adts_set_home(uint8_t *p_adts, bool b_home)
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{
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if (!b_home)
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p_adts[3] &= ~0x10;
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else
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p_adts[3] |= 0x10;
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}
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/* variable header */
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static inline void adts_set_cp_id(uint8_t *p_adts, bool b_bit, bool b_start)
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{
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p_adts[3] &= ~0x0c;
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if (b_bit)
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p_adts[3] |= 0x08;
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if (b_start)
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p_adts[3] |= 0x04;
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}
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static inline void adts_set_length(uint8_t *p_adts, uint16_t i_length)
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{
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p_adts[3] &= ~0x03;
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p_adts[3] |= (i_length >> 11) & 0x03;
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p_adts[4] = i_length >> 3;
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p_adts[5] &= ~0xe0;
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p_adts[5] |= (i_length << 5) & 0xe0;
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}
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static inline void adts_set_fullness(uint8_t *p_adts, uint16_t i_fullness)
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{
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p_adts[5] &= ~0x1f;
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p_adts[5] |= (i_fullness >> 6) & 0x1f;
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p_adts[6] &= ~0xfc;
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p_adts[6] |= (i_fullness << 2) & 0xfc;
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}
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/* i_blocks == number of blocks - 1 */
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static inline void adts_set_num_blocks(uint8_t *p_adts, uint8_t i_blocks)
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{
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p_adts[6] &= ~0x03;
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p_adts[6] |= i_blocks & 0x03;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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