Commit 0be9f7f8 authored by Benjamin Cohen's avatar Benjamin Cohen

Incomplete ATSC A/52 support

parent 7acee600
/*****************************************************************************
* a52.h: ATSC A/52:2012 Digital Audio Compression Standard
*****************************************************************************
* Copyright (C) 2013 VideoLAN
*
* Authors: Benjamin Cohen <bencoh@notk.org>
*
* 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:
* - ATSC A/52:2012
*/
#ifndef __BITSTREAM_ATSC_A52_H__
#define __BITSTREAM_ATSC_A52_H__
#include <stdint.h> /* uint8_t, uint16_t, etc... */
#include <stdbool.h> /* bool */
#ifdef __cplusplus
extern "C"
{
#endif
#define A52_BSID 8
#define A52_BSID_ANNEX_D 1
#define A52_BSID_ANNEX_E 16
#define A52_FSCOD_48KHZ 0
#define A52_FSCOD_441KHZ 1
#define A52_FSCOD_32KHZ 2
#define A52_FSCOD_RESERVED 3
/*****************************************************************************
* A/52 syncinfo (A/52:2012 Table 5.1)
* - syncword 16
* - crc1 16
* - fscod 2
* - frmsizecod 6
*****************************************************************************/
/* A/52 Frame Size Code Table (A/52:2012 Table 5.18) */
static const uint16_t a52_frame_size_code_tab[38][3] = {
{ 64, 69, 96 },
{ 64, 70, 96 },
{ 80, 87, 120 },
{ 80, 88, 120 },
{ 96, 104, 144 },
{ 96, 105, 144 },
{ 112, 121, 168 },
{ 112, 122, 168 },
{ 128, 139, 192 },
{ 128, 140, 192 },
{ 160, 174, 240 },
{ 160, 175, 240 },
{ 192, 208, 288 },
{ 192, 209, 288 },
{ 224, 243, 336 },
{ 224, 244, 336 },
{ 256, 278, 384 },
{ 256, 279, 384 },
{ 320, 348, 480 },
{ 320, 349, 480 },
{ 384, 417, 576 },
{ 384, 418, 576 },
{ 448, 487, 672 },
{ 448, 488, 672 },
{ 512, 557, 768 },
{ 512, 558, 768 },
{ 640, 696, 960 },
{ 640, 697, 960 },
{ 768, 835, 1152 },
{ 768, 836, 1152 },
{ 896, 975, 1344 },
{ 896, 976, 1344 },
{ 1024, 1114, 1536 },
{ 1024, 1115, 1536 },
{ 1152, 1253, 1728 },
{ 1152, 1254, 1728 },
{ 1280, 1393, 1920 },
{ 1280, 1394, 1920 },
};
/* A/52 Bitrate Table (A/52:2012 Table 5.18) */
static const uint16_t a52_bitrate_tab[38] = {
64, 64,
80, 80,
96, 96,
112, 112,
128, 128,
160, 160,
192, 192,
224, 224,
256, 256,
320, 320,
384, 384,
448, 448,
512, 512,
640, 640,
768, 768,
896, 896,
1024, 1024,
1152, 1152,
1280, 1280
};
static inline uint16_t a52_get_sync(const uint8_t *p_a52)
{
return (p_a52[0] << 8 | p_a52[1]);
}
static inline void a52_set_sync(uint8_t *p_a52)
{
p_a52[0] = 0xb;
p_a52[1] = 0x77;
}
static inline uint16_t a52_get_crc(const uint8_t *p_a52)
{
return (p_a52[2] << 8 | p_a52[3]);
}
static inline void a52_set_crc(uint8_t *p_a52, uint16_t i_crc)
{
p_a52[2] = i_crc >> 8;
p_a52[3] = i_crc & 0xff;
}
static inline uint8_t a52_get_fscod(const uint8_t *p_a52)
{
return (p_a52[4] & 0xc0) >> 6;
}
static inline void a52_set_fscod(uint8_t *p_a52, uint8_t i_fscod)
{
p_a52[4] &= ~0xc0;
p_a52[4] |= (i_fscod & 0x3) << 6;
}
static inline uint8_t a52_get_frmsizecod(const uint8_t *p_a52)
{
return p_a52[4] & 0x3f;
}
static inline void a52_set_frmsizecod(uint8_t *p_a52, uint8_t i_frmsizecod)
{
p_a52[4] &= ~0x3f;
p_a52[4] |= i_frmsizecod & 0x3f;
}
static inline uint16_t a52_get_frame_size(uint8_t i_fscod, uint8_t i_frmsizecod)
{
i_fscod &= 0x3;
if ((i_fscod == A52_FSCOD_RESERVED) || (i_frmsizecod > 37)) {
return 0;
}
return a52_frame_size_code_tab[i_frmsizecod][i_fscod] * 2;
}
/*****************************************************************************
* A/52 bsi (Bit Stream Information)
*****************************************************************************/
static inline uint8_t a52_get_bsid(const uint8_t *p_a52)
{
return (p_a52[5] & 0xf8) >> 3;
}
static inline void a52_set_bsid(uint8_t *p_a52, uint8_t i_bsid)
{
p_a52[5] &= ~0xf8;
p_a52[5] |= (i_bsid & 0xf8) << 3;
}
static inline uint8_t a52_get_bsmod(const uint8_t *p_a52)
{
return (p_a52[5] & 0x7);
}
static inline void a52_set_bsmod(uint8_t *p_a52, uint8_t i_bsid)
{
p_a52[5] &= ~0x7;
p_a52[5] |= i_bsid & 0x7;
}
static inline uint8_t a52_get_acmod(const uint8_t *p_a52)
{
return (p_a52[6] & 0xe0) >> 5;
}
static inline void a52_set_acmod(uint8_t *p_a52, uint8_t i_acmod)
{
p_a52[6] &= ~0xe0;
p_a52[6] |= (i_acmod & 0x7) << 5;
}
static inline uint8_t a52_get_cmixlev(const uint8_t *p_a52)
{
return (p_a52[6] & 0x18) >> 3;
}
static inline void a52_set_cmixlev(uint8_t *p_a52, uint8_t i_cmixlev)
{
p_a52[6] &= ~0x18;
p_a52[6] |= (i_cmixlev & 0x3) << 3;
}
/*****************************************************************************
* A/52 Annex E
*****************************************************************************/
static inline uint8_t a52e_get_strmtyp(const uint8_t *p_a52)
{
return (p_a52[2] & 0xc0) >> 5;
}
static inline void a52e_set_strmtyp(uint8_t *p_a52, uint8_t i_strmtyp)
{
p_a52[2] &= ~0xc0;
p_a52[2] |= (i_strmtyp & 0x3) << 6;
}
static inline uint8_t a52e_get_substreamid(const uint8_t *p_a52)
{
return (p_a52[2] & 0x38) >> 3;
}
static inline void a52e_set_substreamid(uint8_t *p_a52, uint8_t i_substreamid)
{
p_a52[2] &= ~0x38;
p_a52[2] |= (i_substreamid & 0x7) << 3;
}
static inline uint16_t a52e_get_frmsiz(const uint8_t *p_a52)
{
return ((p_a52[2] & 0x7) << 8) | p_a52[3];
}
static inline void a52e_set_frmsiz(uint8_t *p_a52, uint16_t i_frmsiz)
{
p_a52[2] &= ~0x7;
p_a52[2] |= (i_frmsiz >> 8) & 0x7;
p_a52[3] |= i_frmsiz & 0xff;
}
static inline uint16_t a52e_get_frame_size(uint16_t i_frmsiz)
{
return (i_frmsiz + 1) * 2;
}
static inline uint8_t a52e_get_fscod(const uint8_t *p_a52)
{
return (p_a52[4] & 0xc0) >> 6;
}
static inline void a52e_set_fscod(uint8_t *p_a52, uint8_t i_fscod)
{
p_a52[4] &= ~0xc0;
p_a52[4] |= (i_fscod & 0x3) << 6;
}
#ifdef __cplusplus
}
#endif
#endif
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