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/*
* section and descriptor parser
*
* Copyright (C) 2005 Kenneth Aafloy (kenneth@linuxtv.org)
* Copyright (C) 2005 Andrew de Quincey (adq_atsc@lidskialf.net)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifndef _UCSI_ATSC_AC3_DESCRIPTOR
#define _UCSI_ATSC_AC3_DESCRIPTOR 1
#ifdef __cplusplus
extern "C"
{
#endif
#include <libucsi/descriptor.h>
#include <libucsi/endianops.h>
enum atsc_ac3_channels {
ATSC_AC3_CHANNELS_1_PLUS_1 = 0x0,
ATSC_AC3_CHANNELS_1_0 = 0x1,
ATSC_AC3_CHANNELS_2_0 = 0x2,
ATSC_AC3_CHANNELS_3_0 = 0x3,
ATSC_AC3_CHANNELS_2_1 = 0x4,
ATSC_AC3_CHANNELS_3_1 = 0x5,
ATSC_AC3_CHANNELS_2_2 = 0x6,
ATSC_AC3_CHANNELS_3_2 = 0x7,
ATSC_AC3_CHANNELS_1 = 0x8,
ATSC_AC3_CHANNELS_LTEQ_2 = 0x9,
ATSC_AC3_CHANNELS_LTEQ_3 = 0xa,
ATSC_AC3_CHANNELS_LTEQ_4 = 0xb,
ATSC_AC3_CHANNELS_LTEQ_5 = 0xc,
ATSC_AC3_CHANNELS_LTEQ_6 = 0xd,
};
/**
* atsc_ac3_descriptor structure.
*/
struct atsc_ac3_descriptor {
struct descriptor d;
EBIT2(uint8_t sample_rate_code : 3; ,
uint8_t bsid : 5; );
EBIT2(uint8_t bit_rate_code : 6; ,
uint8_t surround_mode : 2; );
EBIT3(uint8_t bsmod : 3; ,
uint8_t num_channels : 4; ,
uint8_t full_svc : 1; );
/* uint8_t additional_info[] */
} __ucsi_packed;
/**
* Process an atsc_ac3_descriptor.
*
* @param d Generic descriptor structure.
* @return atsc_ac3_descriptor pointer, or NULL on error.
*/
static inline struct atsc_ac3_descriptor*
atsc_ac3_descriptor_codec(struct descriptor* d)
{
int pos = 0;
if (d->len < (pos+4))
return NULL;
pos += 4;
return (struct atsc_ac3_descriptor*) d;
}
/**
* Retrieve pointer to additional_info field of a atsc_ac3_descriptor.
*
* @param d atsc_ac3_descriptor pointer.
* @return Pointer to additional_info field.
*/
static inline uint8_t *atsc_ac3_descriptor_additional_info(struct atsc_ac3_descriptor *d)
{
int pos = sizeof(struct atsc_ac3_descriptor);
return ((uint8_t *) d) + pos;
}
/**
* Determine length of additional_info field of a atsc_ac3_descriptor.
*
* @param d atsc_ac3_descriptor pointer.
* @return Length of field in bytes.
*/
static inline int atsc_ac3_descriptor_additional_info_length(struct atsc_ac3_descriptor* d)
{
return d->d.len - 3;
}
#ifdef __cplusplus
}
#endif
#endif
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