af_dynaudnorm.c File Reference

Dynamic Audio Normalizer. More...

#include <float.h>
#include "libavutil/avassert.h"
#include "libavutil/opt.h"
#include "libavfilter/bufferqueue.h"
#include "audio.h"
#include "avfilter.h"
#include "internal.h"

Go to the source code of this file.

Data Structures
struct	cqueue
struct	DynamicAudioNormalizerContext

Macros
#define	FF_BUFQUEUE_SIZE   302
#define	OFFSET(x)   offsetof(DynamicAudioNormalizerContext, x)
#define	FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Functions
	AVFILTER_DEFINE_CLASS (dynaudnorm)
static av_cold int	init (AVFilterContext *ctx)
static int	query_formats (AVFilterContext *ctx)
static int	frame_size (int sample_rate, int frame_len_msec)
static void	precalculate_fade_factors (double *fade_factors[2], int frame_len)
static cqueue *	cqueue_create (int size)
static void	cqueue_free (cqueue *q)
static int	cqueue_size (cqueue *q)
static int	cqueue_empty (cqueue *q)
static int	cqueue_enqueue (cqueue *q, double element)
static double	cqueue_peek (cqueue *q, int index)
static int	cqueue_dequeue (cqueue *q, double *element)
static int	cqueue_pop (cqueue *q)
static void	init_gaussian_filter (DynamicAudioNormalizerContext *s)
static int	config_input (AVFilterLink *inlink)
static int	config_output (AVFilterLink *outlink)
static double	fade (double prev, double next, int pos, double *fade_factors[2])
static double	pow2 (const double value)
static double	bound (const double threshold, const double val)
static double	find_peak_magnitude (AVFrame *frame, int channel)
static double	compute_frame_rms (AVFrame *frame, int channel)
static double	get_max_local_gain (DynamicAudioNormalizerContext *s, AVFrame *frame, int channel)
static double	minimum_filter (cqueue *q)
static double	gaussian_filter (DynamicAudioNormalizerContext *s, cqueue *q)
static void	update_gain_history (DynamicAudioNormalizerContext *s, int channel, double current_gain_factor)
static double	update_value (double new, double old, double aggressiveness)
static void	perform_dc_correction (DynamicAudioNormalizerContext *s, AVFrame *frame)
static double	setup_compress_thresh (double threshold)
static double	compute_frame_std_dev (DynamicAudioNormalizerContext *s, AVFrame *frame, int channel)
static void	perform_compression (DynamicAudioNormalizerContext *s, AVFrame *frame)
static void	analyze_frame (DynamicAudioNormalizerContext *s, AVFrame *frame)
static void	amplify_frame (DynamicAudioNormalizerContext *s, AVFrame *frame)
static int	filter_frame (AVFilterLink *inlink, AVFrame *in)
static int	flush_buffer (DynamicAudioNormalizerContext *s, AVFilterLink *inlink, AVFilterLink *outlink)
static int	request_frame (AVFilterLink *outlink)
static av_cold void	uninit (AVFilterContext *ctx)

Variables
static const AVOption	dynaudnorm_options []
static const double	s_pi = 3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679
static const AVFilterPad	avfilter_af_dynaudnorm_inputs []
static const AVFilterPad	avfilter_af_dynaudnorm_outputs []
AVFilter	ff_af_dynaudnorm

Detailed Description

Dynamic Audio Normalizer.

Definition in file af_dynaudnorm.c.

Macro Definition Documentation

#define FF_BUFQUEUE_SIZE   302

Definition at line 32 of file af_dynaudnorm.c.

#define OFFSET

(

x

)

offsetof(DynamicAudioNormalizerContext, x)

Definition at line 76 of file af_dynaudnorm.c.

#define FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 77 of file af_dynaudnorm.c.

Function Documentation

AVFILTER_DEFINE_CLASS

(

dynaudnorm

)

static av_cold int init ( AVFilterContext *  ctx )

static

Definition at line 94 of file af_dynaudnorm.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 106 of file af_dynaudnorm.c.

static int frame_size ( int  sample_rate, int  frame_len_msec  )

inlinestatic

Definition at line 136 of file af_dynaudnorm.c.

Referenced by config_input().

static void precalculate_fade_factors ( double *  fade_factors[2], int  frame_len  )

static

Definition at line 142 of file af_dynaudnorm.c.

Referenced by config_input().

static cqueue* cqueue_create ( int  size )

static

Definition at line 153 of file af_dynaudnorm.c.

Referenced by config_input().

static void cqueue_free ( cqueue *  q )

static

Definition at line 174 of file af_dynaudnorm.c.

Referenced by uninit().

static int cqueue_size ( cqueue *  q )

static

Definition at line 180 of file af_dynaudnorm.c.

Referenced by gaussian_filter(), minimum_filter(), and update_gain_history().

static int cqueue_empty ( cqueue *  q )

static

Definition at line 185 of file af_dynaudnorm.c.

Referenced by cqueue_dequeue(), cqueue_pop(), filter_frame(), perform_compression(), perform_dc_correction(), and update_gain_history().

static int cqueue_enqueue ( cqueue *  q, double  element  )

static

Definition at line 190 of file af_dynaudnorm.c.

Referenced by update_gain_history().

static double cqueue_peek ( cqueue *  q, int  index  )

static

Definition at line 203 of file af_dynaudnorm.c.

Referenced by gaussian_filter(), and minimum_filter().

static int cqueue_dequeue ( cqueue *  q, double *  element  )

static

Definition at line 209 of file af_dynaudnorm.c.

Referenced by amplify_frame().

static int cqueue_pop ( cqueue *  q )

static

Definition at line 220 of file af_dynaudnorm.c.

Referenced by update_gain_history().

static void init_gaussian_filter ( DynamicAudioNormalizerContext *  s )

static

Definition at line 232 of file af_dynaudnorm.c.

Referenced by config_input().

static int config_input ( AVFilterLink *  inlink )

static

Definition at line 259 of file af_dynaudnorm.c.

static int config_output ( AVFilterLink *  outlink )

static

Definition at line 308 of file af_dynaudnorm.c.

static double fade ( double  prev, double  next, int  pos, double *  fade_factors[2]  )

inlinestatic

Definition at line 314 of file af_dynaudnorm.c.

Referenced by amplify_frame(), perform_compression(), and perform_dc_correction().

static double pow2 ( const double  value )

inlinestatic

Definition at line 320 of file af_dynaudnorm.c.

Referenced by compute_frame_rms(), and compute_frame_std_dev().

static double bound ( const double  threshold, const double  val  )

inlinestatic

Definition at line 325 of file af_dynaudnorm.c.

Referenced by get_max_local_gain(), mp_decode_layer1(), mp_decode_layer2(), perform_compression(), and setup_compress_thresh().

static double find_peak_magnitude ( AVFrame *  frame, int  channel  )

static

Definition at line 331 of file af_dynaudnorm.c.

Referenced by get_max_local_gain().

static double compute_frame_rms ( AVFrame *  frame, int  channel  )

static

Definition at line 353 of file af_dynaudnorm.c.

Referenced by get_max_local_gain().

static double get_max_local_gain ( DynamicAudioNormalizerContext *  s, AVFrame *  frame, int  channel  )

static

Definition at line 380 of file af_dynaudnorm.c.

Referenced by analyze_frame().

static double minimum_filter ( cqueue *  q )

static

Definition at line 388 of file af_dynaudnorm.c.

Referenced by update_gain_history().

static double gaussian_filter ( DynamicAudioNormalizerContext *  s, cqueue *  q  )

static

Definition at line 400 of file af_dynaudnorm.c.

Referenced by update_gain_history().

static void update_gain_history ( DynamicAudioNormalizerContext *  s, int  channel, double  current_gain_factor  )

static

Definition at line 412 of file af_dynaudnorm.c.

Referenced by analyze_frame().

static double update_value ( double  new, double  old, double  aggressiveness  )

inlinestatic

Definition at line 453 of file af_dynaudnorm.c.

Referenced by perform_compression(), and perform_dc_correction().

static void perform_dc_correction ( DynamicAudioNormalizerContext *  s, AVFrame *  frame  )

static

Definition at line 459 of file af_dynaudnorm.c.

Referenced by analyze_frame().

static double setup_compress_thresh ( double  threshold )

static

Definition at line 482 of file af_dynaudnorm.c.

Referenced by perform_compression().

static double compute_frame_std_dev ( DynamicAudioNormalizerContext *  s, AVFrame *  frame, int  channel  )

static

Definition at line 503 of file af_dynaudnorm.c.

Referenced by perform_compression().

static void perform_compression ( DynamicAudioNormalizerContext *  s, AVFrame *  frame  )

static

Definition at line 530 of file af_dynaudnorm.c.

Referenced by analyze_frame().

static void analyze_frame ( DynamicAudioNormalizerContext *  s, AVFrame *  frame  )

static

Definition at line 575 of file af_dynaudnorm.c.

Referenced by filter_frame().

static void amplify_frame ( DynamicAudioNormalizerContext *  s, AVFrame *  frame  )

static

Definition at line 599 of file af_dynaudnorm.c.

Referenced by filter_frame().

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

static

Definition at line 624 of file af_dynaudnorm.c.

Referenced by flush_buffer().

static int flush_buffer ( DynamicAudioNormalizerContext *  s, AVFilterLink *  inlink, AVFilterLink *  outlink  )

static

Definition at line 644 of file af_dynaudnorm.c.

Referenced by request_frame().

static int request_frame ( AVFilterLink *  outlink )

static

Definition at line 669 of file af_dynaudnorm.c.

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 683 of file af_dynaudnorm.c.

Variable Documentation

const AVOption dynaudnorm_options[]

static

Initial value:

= {
    { "f", "set the frame length in msec",     OFFSET(frame_len_msec),    AV_OPT_TYPE_INT,    {.i64 = 500},   10,  8000, FLAGS },
    { "g", "set the filter size",              OFFSET(filter_size),       AV_OPT_TYPE_INT,    {.i64 = 31},     3,   301, FLAGS },
    { "p", "set the peak value",               OFFSET(peak_value),        AV_OPT_TYPE_DOUBLE, {.dbl = 0.95}, 0.0,   1.0, FLAGS },
    { "m", "set the max amplification",        OFFSET(max_amplification), AV_OPT_TYPE_DOUBLE, {.dbl = 10.0}, 1.0, 100.0, FLAGS },
    { "r", "set the target RMS",               OFFSET(target_rms),        AV_OPT_TYPE_DOUBLE, {.dbl = 0.0},  0.0,   1.0, FLAGS },
    { "n", "enable channel coupling",          OFFSET(channels_coupled),  AV_OPT_TYPE_INT,    {.i64 = 1},      0,     1, FLAGS },
    { "c", "enable DC correction",             OFFSET(dc_correction),     AV_OPT_TYPE_INT,    {.i64 = 0},      0,     1, FLAGS },
    { "b", "enable alternative boundary mode", OFFSET(alt_boundary_mode), AV_OPT_TYPE_INT,    {.i64 = 0},      0,     1, FLAGS },
    { "s", "set the compress factor",          OFFSET(compress_factor),   AV_OPT_TYPE_DOUBLE, {.dbl = 0.0},  0.0,  30.0, FLAGS },
    { NULL }
}

Definition at line 79 of file af_dynaudnorm.c.

const double s_pi = 3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679

static

Definition at line 230 of file af_dynaudnorm.c.

Referenced by init_gaussian_filter().

const AVFilterPad avfilter_af_dynaudnorm_inputs[]

static

Initial value:

= {
    {
        .name           = "default",
        .type           = AVMEDIA_TYPE_AUDIO,
        .filter_frame   = filter_frame,
        .config_props   = config_input,
        .needs_writable = 1,
    },
    { NULL }
}

Definition at line 709 of file af_dynaudnorm.c.

const AVFilterPad avfilter_af_dynaudnorm_outputs[]

static

Initial value:

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

Definition at line 720 of file af_dynaudnorm.c.

AVFilter ff_af_dynaudnorm

Initial value:

= {
    .name          = "dynaudnorm",
    .description   = NULL_IF_CONFIG_SMALL("Dynamic Audio Normalizer."),
    .query_formats = query_formats,
    .priv_size     = sizeof(DynamicAudioNormalizerContext),
    .init          = init,
    .uninit        = uninit,
    .inputs        = avfilter_af_dynaudnorm_inputs,
    .outputs       = avfilter_af_dynaudnorm_outputs,
    .priv_class    = &dynaudnorm_class,
}

Definition at line 730 of file af_dynaudnorm.c.