af_surround.c File Reference

#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/opt.h"
#include "libavutil/tx.h"
#include "avfilter.h"
#include "audio.h"
#include "filters.h"
#include "internal.h"
#include "formats.h"
#include "window_func.h"

Go to the source code of this file.

Data Structures
struct	AudioSurroundContext

Macros
#define	MIN_MAG_SUM   0.00000001f
#define	TRANSFORM
#define	OFFSET(x)   offsetof(AudioSurroundContext, x)
#define	FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
#define	TFLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM

Enumerations
enum	SurroundChannel {   SC_FL, SC_FR, SC_FC, SC_LF,   SC_BL, SC_BR, SC_BC, SC_SL,   SC_SR, SC_NB }

Functions
static int	query_formats (AVFilterContext *ctx)
static void	set_input_levels (AVFilterContext *ctx)
static void	set_output_levels (AVFilterContext *ctx)
static int	config_input (AVFilterLink *inlink)
static int	config_output (AVFilterLink *outlink)
static float	sqrf (float x)
static float	r_distance (float a)
static void	angle_transform (float *x, float *y, float angle)
static void	focus_transform (float *x, float *y, float focus)
static void	stereo_position (float a, float p, float *x, float *y)
static void	get_lfe (int output_lfe, int n, float lowcut, float highcut, float *lfe_mag, float c_mag, float *mag_total, int lfe_mode)
static void	calculate_factors (AVFilterContext *ctx, int ch, int chan)
static void	do_transform (AVFilterContext *ctx, int ch)
static void	stereo_copy (AVFilterContext *ctx, int ch, int chan)
static void	stereo_upmix (AVFilterContext *ctx, int ch)
static void	l2_1_upmix (AVFilterContext *ctx, int ch)
static void	surround_upmix (AVFilterContext *ctx, int ch)
static void	upmix_7_1_5_0_side (AVFilterContext *ctx, float c_re, float c_im, float mag_totall, float mag_totalr, float fl_phase, float fr_phase, float bl_phase, float br_phase, float sl_phase, float sr_phase, float xl, float yl, float xr, float yr, int n)
static void	upmix_7_1_5_1 (AVFilterContext *ctx, float c_re, float c_im, float lfe_re, float lfe_im, float mag_totall, float mag_totalr, float fl_phase, float fr_phase, float bl_phase, float br_phase, float sl_phase, float sr_phase, float xl, float yl, float xr, float yr, int n)
static void	filter_stereo (AVFilterContext *ctx)
static void	filter_2_1 (AVFilterContext *ctx)
static void	filter_surround (AVFilterContext *ctx)
static void	filter_5_0_side (AVFilterContext *ctx)
static void	filter_5_1_side (AVFilterContext *ctx)
static void	filter_5_1_back (AVFilterContext *ctx)
static void	allchannels_spread (AVFilterContext *ctx)
static av_cold int	init (AVFilterContext *ctx)
static int	fft_channel (AVFilterContext *ctx, AVFrame *in, int ch)
static int	fft_channels (AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
static int	ifft_channel (AVFilterContext *ctx, AVFrame *out, int ch)
static int	ifft_channels (AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
static int	filter_frame (AVFilterLink *inlink, AVFrame *in)
static int	activate (AVFilterContext *ctx)
static av_cold void	uninit (AVFilterContext *ctx)
static int	process_command (AVFilterContext *ctx, const char *cmd, const char *args, char *res, int res_len, int flags)
	AVFILTER_DEFINE_CLASS (surround)

Variables
static const int	ch_map [SC_NB]
static const int	sc_map [16]
static const AVOption	surround_options []
static const AVFilterPad	inputs []
static const AVFilterPad	outputs []
const AVFilter	ff_af_surround

Macro Definition Documentation

MIN_MAG_SUM

#define MIN_MAG_SUM   0.00000001f

Definition at line 323 of file af_surround.c.

TRANSFORM

#define TRANSFORM

Value:

        dst[2 * n    ] = mag * cosf(ph);  \
        dst[2 * n + 1] = mag * sinf(ph);

Definition at line 386 of file af_surround.c.

OFFSET

#define OFFSET

(

x

)

offsetof(AudioSurroundContext, x)

Definition at line 1407 of file af_surround.c.

FLAGS

#define FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 1408 of file af_surround.c.

TFLAGS

#define TFLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM

Definition at line 1409 of file af_surround.c.

Enumeration Type Documentation

SurroundChannel

enum SurroundChannel

Enumerator
SC_FL
SC_FR
SC_FC
SC_LF
SC_BL
SC_BR
SC_BC
SC_SL
SC_SR
SC_NB

Definition at line 32 of file af_surround.c.

Function Documentation

query_formats()

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 149 of file af_surround.c.

set_input_levels()

static void set_input_levels ( AVFilterContext *  ctx )

static

Definition at line 184 of file af_surround.c.

Referenced by config_input(), and process_command().

set_output_levels()

static void set_output_levels ( AVFilterContext *  ctx )

static

Definition at line 199 of file af_surround.c.

Referenced by config_output(), and process_command().

config_input()

static int config_input ( AVFilterLink *  inlink )

static

Definition at line 214 of file af_surround.c.

config_output()

static int config_output ( AVFilterLink *  outlink )

static

Definition at line 258 of file af_surround.c.

sqrf()

static float sqrf ( float  x )

static

Definition at line 313 of file af_surround.c.

Referenced by r_distance().

r_distance()

static float r_distance ( float  a )

static

Definition at line 318 of file af_surround.c.

Referenced by angle_transform(), and focus_transform().

angle_transform()

static void angle_transform ( float *  x, float *  y, float  angle  )

static

Definition at line 325 of file af_surround.c.

Referenced by filter_2_1(), filter_stereo(), and filter_surround().

focus_transform()

static void focus_transform ( float *  x, float *  y, float  focus  )

static

Definition at line 349 of file af_surround.c.

Referenced by filter_2_1(), filter_stereo(), and filter_surround().

stereo_position()

static void stereo_position ( float  a, float  p, float *  x, float *  y  )

static

Definition at line 365 of file af_surround.c.

Referenced by filter_2_1(), filter_5_0_side(), filter_5_1_back(), filter_5_1_side(), filter_stereo(), and filter_surround().

get_lfe()

static void get_lfe ( int  output_lfe, int  n, float  lowcut, float  highcut, float *  lfe_mag, float  c_mag, float *  mag_total, int  lfe_mode  )

inlinestatic

Definition at line 373 of file af_surround.c.

Referenced by filter_stereo(), filter_surround(), and upmix_7_1_5_0_side().

calculate_factors()

static void calculate_factors ( AVFilterContext *  ctx, int  ch, int  chan  )

static

Definition at line 390 of file af_surround.c.

Referenced by l2_1_upmix(), stereo_upmix(), and surround_upmix().

do_transform()

static void do_transform ( AVFilterContext *  ctx, int  ch  )

static

Definition at line 444 of file af_surround.c.

Referenced by l2_1_upmix(), stereo_upmix(), and surround_upmix().

stereo_copy()

static void stereo_copy ( AVFilterContext *  ctx, int  ch, int  chan  )

static

Definition at line 473 of file af_surround.c.

Referenced by stereo_upmix(), and surround_upmix().

stereo_upmix()

static void stereo_upmix ( AVFilterContext *  ctx, int  ch  )

static

Definition at line 527 of file af_surround.c.

Referenced by init().

l2_1_upmix()

static void l2_1_upmix ( AVFilterContext *  ctx, int  ch  )

static

Definition at line 539 of file af_surround.c.

Referenced by init().

surround_upmix()

static void surround_upmix ( AVFilterContext *  ctx, int  ch  )

static

Definition at line 608 of file af_surround.c.

Referenced by init().

upmix_7_1_5_0_side()

static void upmix_7_1_5_0_side ( AVFilterContext *  ctx, float  c_re, float  c_im, float  mag_totall, float  mag_totalr, float  fl_phase, float  fr_phase, float  bl_phase, float  br_phase, float  sl_phase, float  sr_phase, float  xl, float  yl, float  xr, float  yr, int  n  )

static

Definition at line 627 of file af_surround.c.

Referenced by init().

upmix_7_1_5_1()

static void upmix_7_1_5_1 ( AVFilterContext *  ctx, float  c_re, float  c_im, float  lfe_re, float  lfe_im, float  mag_totall, float  mag_totalr, float  fl_phase, float  fr_phase, float  bl_phase, float  br_phase, float  sl_phase, float  sr_phase, float  xl, float  yl, float  xr, float  yr, int  n  )

static

Definition at line 687 of file af_surround.c.

Referenced by init().

filter_stereo()

static void filter_stereo ( AVFilterContext *  ctx )

static

Definition at line 743 of file af_surround.c.

Referenced by init().

filter_2_1()

static void filter_2_1 ( AVFilterContext *  ctx )

static

Definition at line 798 of file af_surround.c.

Referenced by init().

filter_surround()

static void filter_surround ( AVFilterContext *  ctx )

static

Definition at line 855 of file af_surround.c.

Referenced by init().

filter_5_0_side()

static void filter_5_0_side ( AVFilterContext *  ctx )

static

Definition at line 912 of file af_surround.c.

Referenced by init().

filter_5_1_side()

static void filter_5_1_side ( AVFilterContext *  ctx )

static

Definition at line 970 of file af_surround.c.

Referenced by init().

filter_5_1_back()

static void filter_5_1_back ( AVFilterContext *  ctx )

static

Definition at line 1030 of file af_surround.c.

Referenced by init().

allchannels_spread()

static void allchannels_spread ( AVFilterContext *  ctx )

static

Definition at line 1090 of file af_surround.c.

Referenced by init(), and process_command().

init()

static av_cold int init ( AVFilterContext *  ctx )

static

Definition at line 1104 of file af_surround.c.

fft_channel()

static int fft_channel ( AVFilterContext *  ctx, AVFrame *  in, int  ch  )

static

Definition at line 1211 of file af_surround.c.

Referenced by fft_channels().

fft_channels()

static int fft_channels ( AVFilterContext *  ctx, void *  arg, int  jobnr, int  nb_jobs  )

static

Definition at line 1233 of file af_surround.c.

Referenced by filter_frame().

ifft_channel()

static int ifft_channel ( AVFilterContext *  ctx, AVFrame *  out, int  ch  )

static

Definition at line 1245 of file af_surround.c.

Referenced by ifft_channels().

ifft_channels()

static int ifft_channels ( AVFilterContext *  ctx, void *  arg, int  jobnr, int  nb_jobs  )

static

Definition at line 1273 of file af_surround.c.

Referenced by filter_frame().

filter_frame()

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

static

Definition at line 1289 of file af_surround.c.

Referenced by activate().

activate()

static int activate ( AVFilterContext *  ctx )

static

Definition at line 1317 of file af_surround.c.

uninit()

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 1352 of file af_surround.c.

process_command()

static int process_command ( AVFilterContext *  ctx, const char *  cmd, const char *  args, char *  res, int  res_len, int  flags  )

static

Definition at line 1388 of file af_surround.c.

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

surround

)

Variable Documentation

ch_map

const int ch_map[SC_NB]

static

Initial value:

= {
    [SC_FL] = AV_CHAN_FRONT_LEFT,
    [SC_FR] = AV_CHAN_FRONT_RIGHT,
    [SC_FC] = AV_CHAN_FRONT_CENTER,
    [SC_LF] = AV_CHAN_LOW_FREQUENCY,
    [SC_BL] = AV_CHAN_BACK_LEFT,
    [SC_BR] = AV_CHAN_BACK_RIGHT,
    [SC_BC] = AV_CHAN_BACK_CENTER,
    [SC_SL] = AV_CHAN_SIDE_LEFT,
    [SC_SR] = AV_CHAN_SIDE_RIGHT,
}

Definition at line 37 of file af_surround.c.

Referenced by set_input_levels(), set_output_levels(), and write_frame().

sc_map

const int sc_map[16]

static

Initial value:

= {
    [AV_CHAN_FRONT_LEFT   ] = SC_FL,
    [AV_CHAN_FRONT_RIGHT  ] = SC_FR,
    [AV_CHAN_FRONT_CENTER ] = SC_FC,
    [AV_CHAN_LOW_FREQUENCY] = SC_LF,
    [AV_CHAN_BACK_LEFT    ] = SC_BL,
    [AV_CHAN_BACK_RIGHT   ] = SC_BR,
    [AV_CHAN_BACK_CENTER  ] = SC_BC,
    [AV_CHAN_SIDE_LEFT    ] = SC_SL,
    [AV_CHAN_SIDE_RIGHT   ] = SC_SR,
}

Definition at line 49 of file af_surround.c.

Referenced by calculate_factors().

surround_options

const AVOption surround_options[]

static

Definition at line 1411 of file af_surround.c.

inputs

const AVFilterPad inputs[]

static

Initial value:

= {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_AUDIO,
        .config_props = config_input,
    },
}

Definition at line 1469 of file af_surround.c.

outputs

const AVFilterPad outputs[]

static

Initial value:

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

Definition at line 1477 of file af_surround.c.

ff_af_surround

const AVFilter ff_af_surround

Initial value:

= {
    .name           = "surround",
    .description    = NULL_IF_CONFIG_SMALL("Apply audio surround upmix filter."),
    .priv_size      = sizeof(AudioSurroundContext),
    .priv_class     = &surround_class,
    .init           = init,
    .uninit         = uninit,
    .activate       = activate,
    FILTER_INPUTS(inputs),
    FILTER_OUTPUTS(outputs),
    FILTER_QUERY_FUNC(query_formats),
    .flags          = AVFILTER_FLAG_SLICE_THREADS,
    .process_command = process_command,
}

Definition at line 1485 of file af_surround.c.