mirror of https://git.ffmpeg.org/ffmpeg.git
55 lines
2.1 KiB
C
55 lines
2.1 KiB
C
/*
|
|
* AC-3 DSP utils
|
|
* Copyright (c) 2011 Justin Ruggles
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg 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.
|
|
*
|
|
* FFmpeg 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 FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef AVCODEC_AC3DSP_H
|
|
#define AVCODEC_AC3DSP_H
|
|
|
|
#include <stdint.h>
|
|
|
|
typedef struct AC3DSPContext {
|
|
/**
|
|
* Set each encoded exponent in a block to the minimum of itself and the
|
|
* exponents in the same frequency bin of up to 5 following blocks.
|
|
* @param exp pointer to the start of the current block of exponents.
|
|
* constraints: align 16
|
|
* @param num_reuse_blocks number of blocks that will reuse exponents from the current block.
|
|
* constraints: range 0 to 5
|
|
* @param nb_coefs number of frequency coefficients.
|
|
*/
|
|
void (*ac3_exponent_min)(uint8_t *exp, int num_reuse_blocks, int nb_coefs);
|
|
|
|
/**
|
|
* Calculate the maximum MSB of the absolute value of each element in an
|
|
* array of int16_t.
|
|
* @param src input array
|
|
* constraints: align 16. values must be in range [-32767,32767]
|
|
* @param len number of values in the array
|
|
* constraints: multiple of 16 greater than 0
|
|
* @return a value with the same MSB as max(abs(src[]))
|
|
*/
|
|
int (*ac3_max_msb_abs_int16)(const int16_t *src, int len);
|
|
} AC3DSPContext;
|
|
|
|
void ff_ac3dsp_init (AC3DSPContext *c);
|
|
void ff_ac3dsp_init_x86(AC3DSPContext *c);
|
|
|
|
#endif /* AVCODEC_AC3DSP_H */
|