ac3dsp.c File Reference

#include <math.h>
#include <stdlib.h>
#include <string.h>
#include "config.h"
#include "libavutil/attributes.h"
#include "libavutil/common.h"
#include "libavutil/intmath.h"
#include "libavutil/mem_internal.h"
#include "ac3.h"
#include "ac3dsp.h"
#include "mathops.h"

Go to the source code of this file.

Functions
static void	ac3_exponent_min_c (uint8_t *exp, int num_reuse_blocks, int nb_coefs)
static void	float_to_fixed24_c (int32_t *dst, const float *src, unsigned int len)
static void	ac3_bit_alloc_calc_bap_c (int16_t *mask, int16_t *psd, int start, int end, int snr_offset, int floor, const uint8_t *bap_tab, uint8_t *bap)
static void	ac3_update_bap_counts_c (uint16_t mant_cnt[16], uint8_t *bap, int len)
static int	ac3_compute_mantissa_size_c (uint16_t mant_cnt[6][16])
static void	ac3_extract_exponents_c (uint8_t *exp, int32_t *coef, int nb_coefs)
static void	ac3_sum_square_butterfly_int32_c (int64_t sum[4], const int32_t *coef0, const int32_t *coef1, int len)
static void	ac3_sum_square_butterfly_float_c (float sum[4], const float *coef0, const float *coef1, int len)
static void	ac3_downmix_5_to_2_symmetric_c (float **samples, float **matrix, int len)
static void	ac3_downmix_5_to_1_symmetric_c (float **samples, float **matrix, int len)
static void	ac3_downmix_c (float **samples, float **matrix, int out_ch, int in_ch, int len)
static void	ac3_downmix_5_to_2_symmetric_c_fixed (int32_t **samples, int16_t **matrix, int len)
static void	ac3_downmix_5_to_1_symmetric_c_fixed (int32_t **samples, int16_t **matrix, int len)
static void	ac3_downmix_c_fixed (int32_t **samples, int16_t **matrix, int out_ch, int in_ch, int len)
void	ff_ac3dsp_downmix_fixed (AC3DSPContext *c, int32_t **samples, int16_t **matrix, int out_ch, int in_ch, int len)
void	ff_ac3dsp_downmix (AC3DSPContext *c, float **samples, float **matrix, int out_ch, int in_ch, int len)
av_cold void	ff_ac3dsp_init (AC3DSPContext *c, int bit_exact)

Variables
const uint16_t	ff_ac3_bap_bits [16]
	Number of mantissa bits written for each bap value. More...

Function Documentation

ac3_exponent_min_c()

static void ac3_exponent_min_c ( uint8_t *  exp, int  num_reuse_blocks, int  nb_coefs  )

static

Definition at line 36 of file ac3dsp.c.

Referenced by ff_ac3dsp_init().

float_to_fixed24_c()

static void float_to_fixed24_c ( int32_t *  dst, const float *  src, unsigned int  len  )

static

Definition at line 56 of file ac3dsp.c.

Referenced by ff_ac3dsp_init().

ac3_bit_alloc_calc_bap_c()

static void ac3_bit_alloc_calc_bap_c ( int16_t *  mask, int16_t *  psd, int  start, int  end, int  snr_offset, int  floor, const uint8_t *  bap_tab, uint8_t *  bap  )

static

Definition at line 72 of file ac3dsp.c.

Referenced by ff_ac3dsp_init().

ac3_update_bap_counts_c()

static void ac3_update_bap_counts_c ( uint16_t  mant_cnt[16], uint8_t *  bap, int  len  )

static

Definition at line 99 of file ac3dsp.c.

Referenced by ff_ac3dsp_init().

ac3_compute_mantissa_size_c()

static int ac3_compute_mantissa_size_c ( uint16_t  mant_cnt[6][16] )

static

Definition at line 110 of file ac3dsp.c.

Referenced by ff_ac3dsp_init().

ac3_extract_exponents_c()

static void ac3_extract_exponents_c ( uint8_t *  exp, int32_t *  coef, int  nb_coefs  )

static

Definition at line 130 of file ac3dsp.c.

Referenced by ff_ac3dsp_init().

ac3_sum_square_butterfly_int32_c()

static void ac3_sum_square_butterfly_int32_c ( int64_t  sum[4], const int32_t *  coef0, const int32_t *  coef1, int  len  )

static

Definition at line 140 of file ac3dsp.c.

Referenced by ff_ac3dsp_init().

ac3_sum_square_butterfly_float_c()

static void ac3_sum_square_butterfly_float_c ( float  sum[4], const float *  coef0, const float *  coef1, int  len  )

static

Definition at line 161 of file ac3dsp.c.

Referenced by ff_ac3dsp_init().

ac3_downmix_5_to_2_symmetric_c()

static void ac3_downmix_5_to_2_symmetric_c ( float **  samples, float **  matrix, int  len  )

static

Definition at line 182 of file ac3dsp.c.

Referenced by ff_ac3dsp_downmix().

ac3_downmix_5_to_1_symmetric_c()

static void ac3_downmix_5_to_1_symmetric_c ( float **  samples, float **  matrix, int  len  )

static

Definition at line 205 of file ac3dsp.c.

Referenced by ff_ac3dsp_downmix().

ac3_downmix_c()

static void ac3_downmix_c ( float **  samples, float **  matrix, int  out_ch, int  in_ch, int  len  )

static

Definition at line 222 of file ac3dsp.c.

Referenced by ff_ac3dsp_downmix().

ac3_downmix_5_to_2_symmetric_c_fixed()

static void ac3_downmix_5_to_2_symmetric_c_fixed ( int32_t **  samples, int16_t **  matrix, int  len  )

static

Definition at line 248 of file ac3dsp.c.

Referenced by ff_ac3dsp_downmix_fixed().

ac3_downmix_5_to_1_symmetric_c_fixed()

static void ac3_downmix_5_to_1_symmetric_c_fixed ( int32_t **  samples, int16_t **  matrix, int  len  )

static

Definition at line 271 of file ac3dsp.c.

Referenced by ff_ac3dsp_downmix_fixed().

ac3_downmix_c_fixed()

static void ac3_downmix_c_fixed ( int32_t **  samples, int16_t **  matrix, int  out_ch, int  in_ch, int  len  )

static

Definition at line 291 of file ac3dsp.c.

Referenced by ff_ac3dsp_downmix_fixed().

ff_ac3dsp_downmix_fixed()

void ff_ac3dsp_downmix_fixed	(	AC3DSPContext *	c,
		int32_t **	samples,
		int16_t **	matrix,
		int	out_ch,
		int	in_ch,
		int	len
	)

Definition at line 316 of file ac3dsp.c.

ff_ac3dsp_downmix()

void ff_ac3dsp_downmix	(	AC3DSPContext *	c,
		float **	samples,
		float **	matrix,
		int	out_ch,
		int	in_ch,
		int	len
	)

Definition at line 343 of file ac3dsp.c.

Referenced by decode_audio_block().

ff_ac3dsp_init()

av_cold void ff_ac3dsp_init	(	AC3DSPContext *	c,
		int	bit_exact
	)

Definition at line 375 of file ac3dsp.c.

Referenced by ac3_decode_init(), and ff_ac3_encode_init().

Variable Documentation

ff_ac3_bap_bits

const uint16_t ff_ac3_bap_bits[16]

Initial value:

= {
    0,  0,  0,  3,  0,  4,  5,  6,  7,  8,  9, 10, 11, 12, 14, 16
}

Number of mantissa bits written for each bap value.

bap values with fractional bits are set to 0 and are calculated separately.

Definition at line 106 of file ac3dsp.c.

Referenced by ac3_compute_mantissa_size_c().