libavcodec/ac3dsp.c File Reference

#include "libavutil/avassert.h"
#include "avcodec.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 int	ac3_max_msb_abs_int16_c (const int16_t *src, int len)
static void	ac3_lshift_int16_c (int16_t *src, unsigned int len, unsigned int shift)
static void	ac3_rshift_int32_c (int32_t *src, unsigned int len, unsigned int shift)
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_c (float(*samples)[256], float(*matrix)[2], 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.

---

Function Documentation

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 107 of file ac3dsp.c.

Referenced by ff_ac3dsp_init().

static int ac3_compute_mantissa_size_c

(

uint16_t

mant_cnt[6][16]

)

[static]

Definition at line 145 of file ac3dsp.c.

Referenced by ff_ac3dsp_init().

static void ac3_downmix_c	(	float(*)	samples[256],
		float(*)	matrix[2],
		int	out_ch,
		int	in_ch,
		int	len
	)			[static]

Definition at line 217 of file ac3dsp.c.

Referenced by ff_ac3dsp_init().

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

Definition at line 28 of file ac3dsp.c.

Referenced by ff_ac3dsp_init().

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

Definition at line 165 of file ac3dsp.c.

Referenced by ff_ac3dsp_init().

static void ac3_lshift_int16_c	(	int16_t *	src,
		unsigned int	len,
		unsigned int	shift
	)			[static]

Definition at line 56 of file ac3dsp.c.

Referenced by ff_ac3dsp_init().

static int ac3_max_msb_abs_int16_c	(	const int16_t *	src,
		int	len
	)			[static]

Definition at line 48 of file ac3dsp.c.

Referenced by ff_ac3dsp_init().

static void ac3_rshift_int32_c	(	int32_t *	src,
		unsigned int	len,
		unsigned int	shift
	)			[static]

Definition at line 75 of file ac3dsp.c.

Referenced by ff_ac3dsp_init().

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

Definition at line 196 of file ac3dsp.c.

Referenced by ff_ac3dsp_init().

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 175 of file ac3dsp.c.

Referenced by ff_ac3dsp_init().

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

Definition at line 134 of file ac3dsp.c.

Referenced by ff_ac3dsp_init().

av_cold void ff_ac3dsp_init	(	AC3DSPContext *	c,
		int	bit_exact
	)

Definition at line 242 of file ac3dsp.c.

Referenced by ac3_decode_init(), and ff_ac3_encode_init().

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

Definition at line 91 of file ac3dsp.c.

Referenced by ff_ac3dsp_init().

---

Variable Documentation

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 141 of file ac3dsp.c.

Referenced by ac3_compute_mantissa_size_c().