af_mcompand.c File Reference

audio multiband compand filter More...

#include "libavutil/avstring.h"
#include "libavutil/ffmath.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/samplefmt.h"
#include "audio.h"
#include "avfilter.h"
#include "filters.h"

Go to the source code of this file.

Data Structures
struct	CompandSegment
struct	CompandT
struct	PrevCrossover
struct	Crossover
struct	CompBand
struct	MCompandContext

Macros
#define	N   4
#define	OFFSET(x)
#define	A   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
#define	S(x)
#define	S(x)
#define	L(x)
#define	CONVOLVE   _ _ _ _
#define	_
#define	_

Functions
	AVFILTER_DEFINE_CLASS (mcompand)
static av_cold void	uninit (AVFilterContext *ctx)
static void	count_items (char *item_str, int *nb_items, char delimiter)
static void	update_volume (CompBand *cb, double in, int ch)
static double	get_volume (CompandT *s, double in_lin)
static int	parse_points (char *points, int nb_points, double radius, CompandT *s, AVFilterContext *ctx)
static void	square_quadratic (double const *x, double *y)
static int	crossover_setup (AVFilterLink *outlink, Crossover *p, double frequency)
static int	config_output (AVFilterLink *outlink)
static void	crossover (int ch, Crossover *p, double *ibuf, double *obuf_low, double *obuf_high, size_t len)
static int	mcompand_channel (MCompandContext *c, CompBand *l, double *ibuf, double *obuf, int len, int ch)
static int	filter_frame (AVFilterLink *inlink, AVFrame *in)
static int	request_frame (AVFilterLink *outlink)

Variables
static const AVOption	mcompand_options []
static const AVFilterPad	mcompand_inputs []
static const AVFilterPad	mcompand_outputs []
const FFFilter	ff_af_mcompand

Detailed Description

audio multiband compand filter

Definition in file af_mcompand.c.

Macro Definition Documentation

N

#define N   4

Definition at line 54 of file af_mcompand.c.

Referenced by ac_denorm_dblp(), ac_denorm_fltp(), biquad(), build_map(), butterworth_bp_filter(), celt_alg_quant(), celt_alg_unquant(), celt_calc_theta(), celt_compute_qn(), celt_cwrsi(), celt_decode_pulses(), celt_deinterleave_hadamard(), celt_encode_pulses(), celt_extract_collapse_mask(), celt_fir5(), celt_icwrsi(), celt_inner_prod(), celt_interleave_hadamard(), celt_normalize_residual(), celt_renormalize_vector(), celt_stereo_is_decouple(), celt_stereo_merge(), celt_stereo_ms_decouple(), chebyshev1_bp_filter(), chebyshev2_bp_filter(), check_loop_filter(), check_loop_filter_intra(), coef_sf2zf(), compute_dense(), compute_gru(), config_input(), convert_coeffs(), crossover(), decode_spectrum_ac(), decode_usac_core_coder(), dual_inner_prod(), epic_decode_component_pred(), epic_decode_pixel_pred(), epic_decode_run_length(), evolve(), evolve(), ff_aac_ac_finish(), ff_aac_ac_get_context(), ff_aac_ac_map_process(), ff_pvq_search_approx_sse2(), ff_pvq_search_approx_sse4(), ff_pvq_search_exact_avx(), filter_channel(), filter_frame(), flux(), fluxlr(), generate_window_func(), get_centere(), get_final(), hybrid4_8_12_cx(), hybrid6_cx(), iir_mem(), init(), lup_decompose(), lup_invert(), main(), predictor(), process_new(), process_old(), ps_denorm_dblp(), ps_denorm_fltp(), qmf_synth(), quant_band_template(), quant_dn(), QUANT_FN(), QUANT_FN(), remove_doubling(), run_channel_fft(), sq_denorm_dblp(), sq_denorm_fltp(), test_hybrid_analysis(), test_lfe_fir_fixed(), test_lfe_fir_float(), unwrap(), win(), and z_scan_block_avail().

OFFSET

#define OFFSET

(

x

)

Value:

offsetof(MCompandContext, x)

Definition at line 94 of file af_mcompand.c.

A

#define A   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 95 of file af_mcompand.c.

S [1/2]

#define S

(

x

)

Value:

s->segments[2 * ((x) + 1)]

Referenced by parse_points().

S [2/2]

#define S

(

x

)

Value:

s->segments[2 * (x)]

L

#define L

(

x

)

Value:

s->segments[i - (x)]

Referenced by parse_points().

CONVOLVE

#define CONVOLVE   _ _ _ _

Definition at line 467 of file af_mcompand.c.

Referenced by crossover().

_ [1/2]

#define _

Value:

            out_low += p->coefs[j] * p->previous[ch][p->pos + j].in \
            - p->coefs[2*N+2 + j] * p->previous[ch][p->pos + j].out_low, j++;

_ [2/2]

#define _

Value:

            out_high += p->coefs[j+N+1] * p->previous[ch][p->pos + j].in \
            - p->coefs[2*N+2 + j] * p->previous[ch][p->pos + j].out_high, j++;

Function Documentation

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

mcompand

)

uninit()

static av_cold void uninit ( AVFilterContext * ctx )

static

Definition at line 104 of file af_mcompand.c.

count_items()

static void count_items ( char * item_str, int * nb_items, char delimiter )

static

Definition at line 126 of file af_mcompand.c.

Referenced by config_output().

update_volume()

static void update_volume ( CompBand * cb, double in, int ch )

static

Definition at line 137 of file af_mcompand.c.

Referenced by mcompand_channel().

get_volume()

static double get_volume ( CompandT * s, double in_lin )

static

Definition at line 147 of file af_mcompand.c.

Referenced by mcompand_channel().

parse_points()

static int parse_points ( char * points, int nb_points, double radius, CompandT * s, AVFilterContext * ctx )

static

Definition at line 168 of file af_mcompand.c.

Referenced by config_output().

square_quadratic()

static void square_quadratic ( double const * x, double * y )

static

Definition at line 270 of file af_mcompand.c.

Referenced by crossover_setup().

crossover_setup()

static int crossover_setup ( AVFilterLink * outlink, Crossover * p, double frequency )

static

Definition at line 279 of file af_mcompand.c.

Referenced by config_output().

config_output()

static int config_output ( AVFilterLink * outlink )

static

Definition at line 313 of file af_mcompand.c.

crossover()

static void crossover ( int ch, Crossover * p, double * ibuf, double * obuf_low, double * obuf_high, size_t len )

static

Definition at line 469 of file af_mcompand.c.

Referenced by filter_frame().

mcompand_channel()

static int mcompand_channel ( MCompandContext * c, CompBand * l, double * ibuf, double * obuf, int len, int ch )

static

Definition at line 500 of file af_mcompand.c.

Referenced by filter_frame().

filter_frame()

static int filter_frame ( AVFilterLink * inlink, AVFrame * in )

static

Definition at line 553 of file af_mcompand.c.

request_frame()

static int request_frame ( AVFilterLink * outlink )

static

Definition at line 609 of file af_mcompand.c.

Variable Documentation

mcompand_options

const AVOption mcompand_options[]

static

Initial value:

= {
    { "args", "set parameters for each band", OFFSET(args), AV_OPT_TYPE_STRING, { .str = "0.005,0.1 6 -47/-40,-34/-34,-17/-33 100 | 0.003,0.05 6 -47/-40,-34/-34,-17/-33 400 | 0.000625,0.0125 6 -47/-40,-34/-34,-15/-33 1600 | 0.0001,0.025 6 -47/-40,-34/-34,-31/-31,-0/-30 6400 | 0,0.025 6 -38/-31,-28/-28,-0/-25 22000" }, 0, 0, A },
    { NULL }
}

Definition at line 97 of file af_mcompand.c.

mcompand_inputs

const AVFilterPad mcompand_inputs[]

static

Initial value:

= {
    {
        .name           = "default",
        .type           = AVMEDIA_TYPE_AUDIO,
        .filter_frame   = filter_frame,
    },
}

Definition at line 619 of file af_mcompand.c.

mcompand_outputs

const AVFilterPad mcompand_outputs[]

static

Initial value:

= {
    {
        .name          = "default",
        .type          = AVMEDIA_TYPE_AUDIO,
        .request_frame = request_frame,
        .config_props  = config_output,
    },
}

Definition at line 627 of file af_mcompand.c.

ff_af_mcompand

const FFFilter ff_af_mcompand

Initial value:

= {
    .p.name         = "mcompand",
    .p.description  = NULL_IF_CONFIG_SMALL(
            "Multiband Compress or expand audio dynamic range."),
    .p.priv_class   = &mcompand_class,
    .priv_size      = sizeof(MCompandContext),
    .uninit         = uninit,
    FILTER_INPUTS(mcompand_inputs),
    FILTER_OUTPUTS(mcompand_outputs),
    FILTER_SINGLE_SAMPLEFMT(AV_SAMPLE_FMT_DBLP),
}

Definition at line 637 of file af_mcompand.c.