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libavcodec
ac3dsp.h
Go to the documentation of this file.
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/*
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* AC-3 DSP utils
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* Copyright (c) 2011 Justin Ruggles
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_AC3DSP_H
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#define AVCODEC_AC3DSP_H
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#include <stdint.h>
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extern
const
uint16_t
ff_ac3_bap_bits
[16];
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typedef
struct
AC3DSPContext
{
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void
(*
ac3_exponent_min
)(uint8_t *exp,
int
num_reuse_blocks,
int
nb_coefs);
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int (*
ac3_max_msb_abs_int16
)(
const
int16_t *src,
int
len
);
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void
(*
ac3_lshift_int16
)(int16_t *src,
unsigned
int
len
,
unsigned
int
shift);
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void
(*
ac3_rshift_int32
)(int32_t *src,
unsigned
int
len
,
unsigned
int
shift);
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void
(*
float_to_fixed24
)(int32_t *dst,
const
float
*src,
unsigned
int
len
);
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void
(*
bit_alloc_calc_bap
)(int16_t *
mask
, int16_t *psd,
int
start,
int
end,
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int
snr_offset,
int
floor,
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const
uint8_t *bap_tab, uint8_t *bap);
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void
(*
update_bap_counts
)(uint16_t mant_cnt[16], uint8_t *bap,
int
len
);
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int (*
compute_mantissa_size
)(uint16_t mant_cnt[6][16]);
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void
(*
extract_exponents
)(uint8_t *exp, int32_t *coef,
int
nb_coefs);
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}
AC3DSPContext
;
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void
ff_ac3dsp_init
(
AC3DSPContext
*c,
int
bit_exact);
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void
ff_ac3dsp_init_arm
(
AC3DSPContext
*c,
int
bit_exact);
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void
ff_ac3dsp_init_x86
(
AC3DSPContext
*c,
int
bit_exact);
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#endif
/* AVCODEC_AC3DSP_H */