You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
305 lines
8.4 KiB
305 lines
8.4 KiB
/*****************************************************************************
|
|
* aac.h: ISO/IEC 14496-3 Advanced Audio Coding
|
|
*****************************************************************************
|
|
* Copyright (C) 2010, 2013, 2017 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)
|
|
* - ISO/IEC 13818-1:2013(E) (MPEG-2 Systems)
|
|
*/
|
|
|
|
#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_CRC_SIZE 2
|
|
#define ADTS_SAMPLES_PER_BLOCK 1024
|
|
#define ADTS_PROFILE_MAIN 0
|
|
#define ADTS_PROFILE_LC 1
|
|
#define ADTS_PROFILE_SSR 2
|
|
|
|
/* 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);
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* LOAS header
|
|
*****************************************************************************/
|
|
#define LOAS_HEADER_SIZE 3
|
|
|
|
static inline void loas_set_sync(uint8_t *p)
|
|
{
|
|
p[0] = 0x56;
|
|
p[1] = 0xe0;
|
|
p[2] = 0x0;
|
|
}
|
|
|
|
static inline uint16_t loas_get_length(const uint8_t *p)
|
|
{
|
|
return ((p[1] & 0x01f) << 8) | p[2];
|
|
}
|
|
|
|
static inline void loas_set_length(uint8_t *p, uint16_t val)
|
|
{
|
|
p[1] = 0xe0 | (val >> 8);
|
|
p[2] = val & 0xff;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* AudioSpecificConfig
|
|
*****************************************************************************/
|
|
#define ASC_TYPE_MAIN 1
|
|
#define ASC_TYPE_LC 2
|
|
#define ASC_TYPE_SSR 3
|
|
#define ASC_TYPE_LTP 4
|
|
#define ASC_TYPE_SBR 5
|
|
#define ASC_TYPE_SCALABLE 6
|
|
#define ASC_TYPE_TWINVQ 7
|
|
#define ASC_TYPE_CELP 8
|
|
#define ASC_TYPE_HVXC 9
|
|
#define ASC_TYPE_ER_LC 17
|
|
#define ASC_TYPE_ER_LTP 19
|
|
#define ASC_TYPE_ER_SCALABLE 20
|
|
#define ASC_TYPE_ER_TWINVQ 21
|
|
#define ASC_TYPE_ER_BSAC 22
|
|
#define ASC_TYPE_ER_LD 23
|
|
#define ASC_TYPE_PS 29
|
|
|
|
#define ASC_FLT_VARIABLE 0
|
|
#define ASC_FLT_FIXED 1
|
|
#define ASC_FLT_CELP_2 3
|
|
#define ASC_FLT_CELP_FIXED 4
|
|
#define ASC_FLT_CELP_4 5
|
|
#define ASC_FLT_HVXC_FIXED 6
|
|
#define ASC_FLT_HVXC_4 7
|
|
|
|
/* Returns the profile_and_level structure for MPEG-4 audio descriptor */
|
|
static inline uint8_t asc_get_profilelevel(uint8_t asc_aot, uint8_t channels, uint32_t rate)
|
|
{
|
|
uint8_t profilelevel;
|
|
switch (asc_aot) {
|
|
case ASC_TYPE_LC:
|
|
profilelevel = 0x50;
|
|
break;
|
|
|
|
case ASC_TYPE_SBR:
|
|
profilelevel = 0x58;
|
|
break;
|
|
|
|
case ASC_TYPE_ER_LD:
|
|
return 0x38;
|
|
|
|
case ASC_TYPE_PS:
|
|
profilelevel = 0x60;
|
|
break;
|
|
|
|
default:
|
|
return 0xf;
|
|
}
|
|
|
|
if (rate > 48000)
|
|
return profilelevel + 3;
|
|
if (channels > 2)
|
|
return profilelevel + 2;
|
|
if (rate > 24000)
|
|
return profilelevel + 1;
|
|
return profilelevel;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* AAC syntactic elements
|
|
*****************************************************************************/
|
|
#define AAC_SYN_SCE 0
|
|
#define AAC_SYN_CPE 1
|
|
#define AAC_SYN_CCE 2
|
|
#define AAC_SYN_LFE 3
|
|
#define AAC_SYN_DSE 4
|
|
#define AAC_SYN_PCE 5
|
|
#define AAC_SYN_FIL 6
|
|
#define AAC_SYN_END 7
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|