/usr/include/bitstream/mpeg/aac.h is in libbitstream-dev 1.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* aac.h: ISO/IEC 14496-3 Advanced Audio Coding
*****************************************************************************
* Copyright (C) 2010, 2013 VideoLAN
*
* Authors: Christophe Massiot <massiot@via.ecp.fr>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject
* to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*****************************************************************************/
/*
* Normative references:
* - ISO/IEC 14496-3 Subpart 4:1998(E)
* (Advanced Audio Coding, Time/Frequency Coding)
*/
#ifndef __BITSTREAM_MPEG_AAC_H__
#define __BITSTREAM_MPEG_AAC_H__
#include <stdint.h> /* uint8_t, uint16_t, etc... */
#include <stdbool.h> /* bool */
#ifdef __cplusplus
extern "C"
{
#endif
/*****************************************************************************
* ADTS header
*****************************************************************************/
#define ADTS_HEADER_SIZE 7
#define ADTS_SAMPLES_PER_BLOCK 1024
/* fixed header */
static inline void adts_set_sync(uint8_t *p_adts)
{
p_adts[0] = 0xff;
p_adts[1] = 0xf9; /* protection absent */
p_adts[2] = 0x0;
p_adts[3] = 0x0;
p_adts[4] = 0x0;
p_adts[5] = 0x0;
p_adts[6] = 0x0;
}
static inline bool adts_get_protection_absent(const uint8_t *p_adts)
{
return !!(p_adts[1] & 0x01);
}
static inline void adts_clear_protection_absent(uint8_t *p_adts)
{
p_adts[1] &= ~0x01;
}
static inline uint8_t adts_get_profile(const uint8_t *p_adts)
{
return p_adts[2] >> 6;
}
static inline void adts_set_profile(uint8_t *p_adts, uint8_t i_profile)
{
p_adts[2] &= ~0xc0;
p_adts[2] |= i_profile << 6;
}
static inline uint8_t adts_get_sampling_freq(const uint8_t *p_adts)
{
return (p_adts[2] & 0x3c) >> 2;
}
static inline void adts_set_sampling_freq(uint8_t *p_adts, uint8_t i_freq)
{
p_adts[2] &= ~0x3c;
p_adts[2] |= (i_freq & 0xf) << 2;
}
static inline uint8_t adts_get_channels(const uint8_t *p_adts)
{
return ((p_adts[2] & 0x01) << 2) | (p_adts[3] >> 6);
}
static inline void adts_set_channels(uint8_t *p_adts, uint8_t i_channels)
{
p_adts[2] &= ~0x03; /* also clear out the private bit */
p_adts[2] |= (i_channels & 0x7) >> 2;
p_adts[3] &= ~0xc0;
p_adts[3] |= (i_channels & 0x7) << 6;
}
static inline bool adts_get_copy(const uint8_t *p_adts)
{
return !!(p_adts[3] & 0x20);
}
static inline void adts_set_copy(uint8_t *p_adts)
{
p_adts[3] |= 0x20;
}
static inline bool adts_get_home(const uint8_t *p_adts)
{
return !!(p_adts[3] & 0x10);
}
static inline void adts_set_home(uint8_t *p_adts)
{
p_adts[3] |= 0x10;
}
/* variable header */
static inline void adts_get_cp_id(const uint8_t *p_adts, bool *pb_bit, bool *pb_start)
{
*pb_bit = !!(p_adts[3] & 0x08);
*pb_start = !!(p_adts[3] & 0x04);
}
static inline void adts_set_cp_id(uint8_t *p_adts, bool b_bit, bool b_start)
{
p_adts[3] &= ~0x0c;
if (b_bit)
p_adts[3] |= 0x08;
if (b_start)
p_adts[3] |= 0x04;
}
static inline uint16_t adts_get_length(const uint8_t *p_adts)
{
return ((p_adts[3] & 0x03) << 11) | (p_adts[4] << 3) | (p_adts[5] >> 5);
}
static inline void adts_set_length(uint8_t *p_adts, uint16_t i_length)
{
p_adts[3] &= ~0x03;
p_adts[3] |= (i_length >> 11) & 0x03;
p_adts[4] = i_length >> 3;
p_adts[5] &= ~0xe0;
p_adts[5] |= (i_length << 5) & 0xe0;
}
static inline uint16_t adts_get_fullness(const uint8_t *p_adts)
{
return ((p_adts[5] & 0x1f) << 6) | (p_adts[6] >> 2);
}
static inline void adts_set_fullness(uint8_t *p_adts, uint16_t i_fullness)
{
p_adts[5] &= ~0x1f;
p_adts[5] |= (i_fullness >> 6) & 0x1f;
p_adts[6] &= ~0xfc;
p_adts[6] |= (i_fullness << 2) & 0xfc;
}
/* blocks == number of blocks - 1 */
static inline uint8_t adts_get_num_blocks(const uint8_t *p_adts)
{
return (p_adts[6] & 0x03);
}
static inline void adts_set_num_blocks(uint8_t *p_adts, uint8_t i_blocks_min1)
{
p_adts[6] &= ~0x03;
p_adts[6] |= i_blocks_min1 & 0x03;
}
static inline bool adts_sync_compare(const uint8_t *p_adts1, const uint8_t *p_adts2)
{
return p_adts1[0] == p_adts2[0] &&
p_adts1[1] == p_adts2[1] &&
p_adts1[2] == p_adts2[2] &&
(p_adts1[3] & 0xfc) == (p_adts2[3] & 0xfc);
}
/* same but only takes into account meaningful fields */
static inline bool adts_sync_compare_formats(const uint8_t *p_adts1, const uint8_t *p_adts2)
{
return p_adts1[0] == p_adts2[0] &&
(p_adts1[1] & 0xfe) == (p_adts2[1] & 0xfe) &&
p_adts1[2] == p_adts2[2] &&
(p_adts1[3] & 0xc0) == (p_adts2[3] & 0xc0);
}
#ifdef __cplusplus
}
#endif
#endif
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