mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-21 16:55:05 +02:00
![Michael Niedermayer](/assets/img/avatar_default.png)
* commit '30b39164256999efc8d77edc85e2e0b963c24834': ac3dec: make downmix() take array of pointers to channel data Conflicts: libavcodec/ac3dsp.c libavcodec/ac3dsp.h Merged-by: Michael Niedermayer <michaelni@gmx.at>
145 lines
5.7 KiB
C
145 lines
5.7 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>
|
|
|
|
/**
|
|
* Number of mantissa bits written for each bap value.
|
|
* bap values with fractional bits are set to 0 and are calculated separately.
|
|
*/
|
|
extern const uint16_t ff_ac3_bap_bits[16];
|
|
|
|
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);
|
|
|
|
/**
|
|
* Left-shift each value in an array of int16_t by a specified amount.
|
|
* @param src input array
|
|
* constraints: align 16
|
|
* @param len number of values in the array
|
|
* constraints: multiple of 32 greater than 0
|
|
* @param shift left shift amount
|
|
* constraints: range [0,15]
|
|
*/
|
|
void (*ac3_lshift_int16)(int16_t *src, unsigned int len, unsigned int shift);
|
|
|
|
/**
|
|
* Right-shift each value in an array of int32_t by a specified amount.
|
|
* @param src input array
|
|
* constraints: align 16
|
|
* @param len number of values in the array
|
|
* constraints: multiple of 16 greater than 0
|
|
* @param shift right shift amount
|
|
* constraints: range [0,31]
|
|
*/
|
|
void (*ac3_rshift_int32)(int32_t *src, unsigned int len, unsigned int shift);
|
|
|
|
/**
|
|
* Convert an array of float in range [-1.0,1.0] to int32_t with range
|
|
* [-(1<<24),(1<<24)]
|
|
*
|
|
* @param dst destination array of int32_t.
|
|
* constraints: 16-byte aligned
|
|
* @param src source array of float.
|
|
* constraints: 16-byte aligned
|
|
* @param len number of elements to convert.
|
|
* constraints: multiple of 32 greater than zero
|
|
*/
|
|
void (*float_to_fixed24)(int32_t *dst, const float *src, unsigned int len);
|
|
|
|
/**
|
|
* Calculate bit allocation pointers.
|
|
* The SNR is the difference between the masking curve and the signal. AC-3
|
|
* uses this value for each frequency bin to allocate bits. The snroffset
|
|
* parameter is a global adjustment to the SNR for all bins.
|
|
*
|
|
* @param[in] mask masking curve
|
|
* @param[in] psd signal power for each frequency bin
|
|
* @param[in] start starting bin location
|
|
* @param[in] end ending bin location
|
|
* @param[in] snr_offset SNR adjustment
|
|
* @param[in] floor noise floor
|
|
* @param[in] bap_tab look-up table for bit allocation pointers
|
|
* @param[out] bap bit allocation pointers
|
|
*/
|
|
void (*bit_alloc_calc_bap)(int16_t *mask, int16_t *psd, int start, int end,
|
|
int snr_offset, int floor,
|
|
const uint8_t *bap_tab, uint8_t *bap);
|
|
|
|
/**
|
|
* Update bap counts using the supplied array of bap.
|
|
*
|
|
* @param[out] mant_cnt bap counts for 1 block
|
|
* @param[in] bap array of bap, pointing to start coef bin
|
|
* @param[in] len number of elements to process
|
|
*/
|
|
void (*update_bap_counts)(uint16_t mant_cnt[16], uint8_t *bap, int len);
|
|
|
|
/**
|
|
* Calculate the number of bits needed to encode a set of mantissas.
|
|
*
|
|
* @param[in] mant_cnt bap counts for all blocks
|
|
* @return mantissa bit count
|
|
*/
|
|
int (*compute_mantissa_size)(uint16_t mant_cnt[6][16]);
|
|
|
|
void (*extract_exponents)(uint8_t *exp, int32_t *coef, int nb_coefs);
|
|
|
|
void (*sum_square_butterfly_int32)(int64_t sum[4], const int32_t *coef0,
|
|
const int32_t *coef1, int len);
|
|
|
|
void (*sum_square_butterfly_float)(float sum[4], const float *coef0,
|
|
const float *coef1, int len);
|
|
|
|
void (*downmix)(float **samples, float (*matrix)[2], int out_ch,
|
|
int in_ch, int len);
|
|
} AC3DSPContext;
|
|
|
|
void ff_ac3dsp_init (AC3DSPContext *c, int bit_exact);
|
|
void ff_ac3dsp_init_arm(AC3DSPContext *c, int bit_exact);
|
|
void ff_ac3dsp_init_x86(AC3DSPContext *c, int bit_exact);
|
|
void ff_ac3dsp_init_mips(AC3DSPContext *c, int bit_exact);
|
|
|
|
#endif /* AVCODEC_AC3DSP_H */
|