ref: e60dbd620fdf1ca426d1ff12b212aef45be4d3c2
parent: 003122e81840e308f5834577ee5c8b213c95135e
author: Ulrich Klauer <ulrich@chirlu.de>
date: Tue Mar 5 18:20:54 EST 2013
Remove deprecated mixer effect
--- a/ChangeLog
+++ b/ChangeLog
@@ -16,15 +16,9 @@
14.3.0 O -s/-u/-f -e
14.3.0 O -A/-U/-o/-i/-a/-g -e
14.4.0 E swap with parameters remix
+ 14.4.0 E mixer remix
14.4.1 OpenMP < 3.0 OpenMP >= 3.0
14.4.1 F ffmpeg ffmpeg/avconv via pipe
-
-Previously deprecated features (to be removed in future):
-
- Deprec- Feature [O(ption)] Removal
- ated in [F(ormat)] [E(ffect)] Replacement due after
- ------- ---------------------- ---------------------- -------
- 14.4.0 E mixer remix 2013-03-04
Effects:
--- a/msvc10/LibSoX.vcxproj
+++ b/msvc10/LibSoX.vcxproj
@@ -219,7 +219,6 @@
<ClCompile Include="..\src\ladspa.c" />
<ClCompile Include="..\src\loudness.c" />
<ClCompile Include="..\src\mcompand.c" />
- <ClCompile Include="..\src\mixer.c" />
<ClCompile Include="..\src\noiseprof.c" />
<ClCompile Include="..\src\noisered.c" />
<ClCompile Include="..\src\output.c" />
--- a/msvc10/LibSoX.vcxproj.filters
+++ b/msvc10/LibSoX.vcxproj.filters
@@ -252,9 +252,6 @@
<ClCompile Include="..\src\mcompand.c">
<Filter>Effect Sources</Filter>
</ClCompile>
- <ClCompile Include="..\src\mixer.c">
- <Filter>Effect Sources</Filter>
- </ClCompile>
<ClCompile Include="..\src\noiseprof.c">
<Filter>Effect Sources</Filter>
</ClCompile>
--- a/msvc9/LibSoX.vcproj
+++ b/msvc9/LibSoX.vcproj
@@ -730,10 +730,6 @@
>
</File>
<File
- RelativePath="..\src\mixer.c"
- >
- </File>
- <File
RelativePath="..\src\noiseprof.c"
>
</File>
--- a/sox.1
+++ b/sox.1
@@ -4174,66 +4174,6 @@
for a volume-changing effect with different capabilities, and
.B compand
for a dynamic-range compression/expansion/limiting effect.
-.SS Deprecated Effects
-The following effects have been renamed or have their functionality
-included in another effect; they continue to work in this version of
-SoX but may be removed in future.
-.TP
-\fBmixer\fR [ \fB\-l\fR\^|\^\fB\-r\fR\^|\^\fB\-f\fR\^|\^\fB\-b\fR\^|\^\fB\-1\fR\^|\^\fB\-2\fR\^|\^\fB\-3\fR\^|\^\fB\-4\fR\^|\^\fIn\fR{\fB,\fIn\fR} ]-Reduce the number of audio channels by mixing or selecting channels,
-or increase the number of channels by duplicating channels.
-Note: this effect operates on the audio
-.I channels
-within the SoX effects processing chain; it should not be confused with the
-.B \-m
-global option (where multiple
-.I files
-are mix-combined before entering the effects chain).
-.SP
-When reducing the number of channels it is possible to
-use the \fB\-l\fR, \fB\-r\fR, \fB\-f\fR, \fB\-b\fR,
-\fB\-1\fR, \fB\-2\fR, \fB\-3\fR, \fB\-4\fR, options to select only
-the left, right, front, back channel(s) or specific channel
-for the output instead of averaging the channels.
-The \fB\-l\fR, and \fB\-r\fR options will do averaging
-in quad-channel files so select the exact channel to prevent this.
-.SP
-The
-.B mixer
-effect can also be invoked with up to 16
-numbers, separated by commas, which specify the proportion (0 = 0% and 1 = 100%)
-of each input channel that is to be mixed into each output channel.
-In two-channel mode, 4 numbers are given: l \*(RA l, l \*(RA r, r \*(RA l, and r \*(RA r,
-respectively.
-In four-channel mode, the first 4 numbers give the proportions for the
-left-front output channel, as follows: lf \*(RA lf, rf \*(RA lf, lb \*(RA lf, and
-rb \*(RA rf.
-The next 4 give the right-front output in the same order, then
-left-back and right-back.
-.SP
-It is also possible to use the 16 numbers to expand or reduce the
-channel count; just specify 0 for unused channels.
-.SP
-Finally, certain reduced combination of numbers can be specified
-for certain input/output channel combinations.
-.ne 7
-.TS
-center;
-cI cI cI lI
-c c c l .
-In Ch Out Ch Num Mappings
-2 1 2 l \*(RA l, r \*(RA l
-2 2 1 adjust balance
-4 1 4 lf \*(RA l, rf \*(RA l, lb \*(RA l, rb \*(RA l
-4 2 2 lf \*(RA l&rf \*(RA r, lb \*(RA l&rb \*(RA r
-4 4 1 adjust balance
-4 4 2 front balance, back balance
-.TE
-.DT
-.SP
-This effect has been superseded by the
-.B remix
-effect that handles any number of channels.
.SH DIAGNOSTICS
Exit status is 0 for no error, 1 if there is a problem with the
command-line parameters, or 2 if an error occurs during file processing.
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -47,7 +47,6 @@
input
loudness
mcompand
- mixer
noiseprof
noisered
output
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -72,7 +72,7 @@
echo.c echos.c effects.c effects.h effects_i.c effects_i_dsp.c \
fade.c fft4g.c fft4g.h fifo.h fir.c firfit.c flanger.c gain.c \
hilbert.c input.c ladspa.h ladspa.c loudness.c mcompand.c \
- mcompand_xover.h mixer.c noiseprof.c noisered.c \
+ mcompand_xover.h noiseprof.c noisered.c \
noisered.h output.c overdrive.c pad.c phaser.c rate.c \
rate_filters.h rate_half_fir.h rate_poly_fir0.h rate_poly_fir.h \
remix.c repeat.c reverb.c reverse.c silence.c sinc.c skeleff.c \
--- a/src/effects.h
+++ b/src/effects.h
@@ -51,7 +51,6 @@
EFFECT(loudness)
EFFECT(lowpass)
EFFECT(mcompand)
- EFFECT(mixer)
EFFECT(noiseprof)
EFFECT(noisered)
EFFECT(norm)
--- a/src/mixer.c
+++ /dev/null
@@ -1,553 +1,0 @@
-/* July 5, 1991
- * Copyright 1991 Lance Norskog And Sundry Contributors
- * This source code is freely redistributable and may be used for
- * any purpose. This copyright notice must be maintained.
- * Lance Norskog And Sundry Contributors are not responsible for
- * the consequences of using this software.
- *
- * Channel duplication code by Graeme W. Gill - 93/5/18
- * General-purpose panning by Geoffrey H. Kuenning -- 2000/11/28
- */
-
-/*
- * libSoX stereo/quad -> mono mixdown effect file.
- * and mono/stereo -> stereo/quad channel duplication.
- */
-
-#include "sox_i.h"
-#include <ctype.h>
-#include <string.h>
-#include <stdlib.h>
-
-typedef struct {- /* How to generate each output channel. sources[i][j] */
- /* represents the fraction of channel i that should be passed */
- /* through to channel j on output, and so forth. Channel 0 is */
- /* left front, channel 1 is right front, and 2 and 3 are left */
- /* and right rear, respectively. (GHK) */
- double sources[4][4];
- int num_pans;
- int mix; /* How are we mixing it? */
-} priv_t;
-
-/* MIX_CENTER is shorthand to mix channels together at 50% each */
-#define MIX_CENTER 0
-#define MIX_SPECIFIED 1
-
-
-/*
- * Process options
- */
-static int getopts(sox_effect_t * effp, int argc, char **argv)
-{- priv_t * mixer = (priv_t *) effp->priv;
- double* pans = &mixer->sources[0][0];
- int i;
- --argc, ++argv;
-
- for (i = 0; i < 16; i++)
- pans[i] = 0.0;
- mixer->mix = MIX_CENTER;
- mixer->num_pans = 0;
-
- /* Parse parameters. Since we don't yet know the number of */
- /* input and output channels, we'll record the information for */
- /* later. */
- if (argc == 1) {- if (!strcmp(argv[0], "-l")) mixer->mix = 'l';
- else if (!strcmp(argv[0], "-r")) mixer->mix = 'r';
- else if (!strcmp(argv[0], "-f")) mixer->mix = 'f';
- else if (!strcmp(argv[0], "-b")) mixer->mix = 'b';
- else if (!strcmp(argv[0], "-1")) mixer->mix = '1';
- else if (!strcmp(argv[0], "-2")) mixer->mix = '2';
- else if (!strcmp(argv[0], "-3")) mixer->mix = '3';
- else if (!strcmp(argv[0], "-4")) mixer->mix = '4';
- else if (argv[0][0] == '-' && !isdigit((int)argv[0][1])
- && argv[0][1] != '.')
- return lsx_usage(effp);
- else {- int commas;
- char *s;
- mixer->mix = MIX_SPECIFIED;
- pans[0] = atof(argv[0]);
- for (s = argv[0], commas = 0; *s; ++s) {- if (*s == ',') {- ++commas;
- if (commas >= 16) {- lsx_fail("mixer can only take up to 16 pan values");- return (SOX_EOF);
- }
- pans[commas] = atof(s+1);
- }
- }
- mixer->num_pans = commas + 1;
- }
- }
- else if (argc == 0) {- mixer->mix = MIX_CENTER;
- }
- else
- return lsx_usage(effp);
-
- return (SOX_SUCCESS);
-}
-
-/*
- * Start processing
- */
-static int start(sox_effect_t * effp)
-{- /*
- Hmmm, this is tricky. Lemme think:
- channel orders are [0][0],[0][1], etc.
- i.e., 0->0, 0->1, 0->2, 0->3, 1->0, 1->1, ...
- trailing zeros are omitted
- L/R balance is x= -1 for left only, 1 for right only
- 1->1 channel effects:
- changing volume by x is x,0,0,0
- 1->2 channel effects:
- duplicating everywhere is 1,1,0,0
- 1->4 channel effects:
- duplicating everywhere is 1,1,1,1
- 2->1 channel effects:
- left only is 1,0,0,0 0,0,0,0
- right only is 0,0,0,0 1,0,0,0
- left+right is 0.5,0,0,0 0.5,0,0,0
- left-right is 1,0,0,0 -1,0,0,0
- 2->2 channel effects:
- L/R balance can be done several ways. The standard stereo
- way is both the easiest and the most sensible:
- min(1-x,1),0,0,0 0,min(1+x,1),0,0
- left to both is 1,1,0,0
- right to both is 0,0,0,0 1,1,0,0
- left+right to both is 0.5,0.5,0,0 0.5,0.5,0,0
- left-right to both is 1,1,0,0 -1,-1,0,0
- left-right to left, right-left to right is 1,-1,0,0 -1,1,0,0
- 2->4 channel effects:
- front duplicated into rear is 1,0,1,0 0,1,0,1
- front swapped into rear (why?) is 1,0,0,1 0,1,1,0
- front put into rear as mono (why?) is 1,0,0.5,0.5 0,1,0.5,0.5
- 4->1 channel effects:
- left front only is 1,0,0,0
- left only is 0.5,0,0,0 0,0,0,0 0.5,0,0,0
- etc.
- 4->2 channel effects:
- merge front/back is 0.5,0,0,0 0,0.5,0,0 0.5,0,0,0 0,0.5,0,0
- selections similar to above
- 4->4 channel effects:
- left front to all is 1,1,1,1 0,0,0,0
- right front to all is 0,0,0,0 1,1,1,1
- left f/r to all f/r is 1,1,0,0 0,0,0,0 0,0,1,1 0,0,0,0
- etc.
-
- The interesting cases from above (deserving of abbreviations of
- less than 16 numbers) are:
-
- 0) n->n volume change (1 number)
- 1) 1->n duplication (0 numbers)
- 2) 2->1 mixdown (0 or 2 numbers)
- 3) 2->2 balance (1 number)
- 4) 2->2 fully general mix (4 numbers)
- 5) 2->4 duplication (0 numbers)
- 6) 4->1 mixdown (0 or 4 numbers)
- 7) 4->2 mixdown (0, or 2 numbers)
- 8) 4->4 balance (1 or 2 numbers)
-
- The above has one ambiguity: n->n volume change conflicts with
- n->n balance for n != 1. In such a case, we'll prefer
- balance, since there is already a volume effect in vol.c.
-
- GHK 2000/11/28
- */
- priv_t * mixer = (priv_t *) effp->priv;
- double pans[16];
- int i, j;
- int ichan, ochan;
-
- for (i = 0; i < 16; i++)
- pans[i] = ((double*)&mixer->sources[0][0])[i];
-
- ichan = effp->in_signal.channels;
- ochan = effp->out_signal.channels;
- if (ochan == -1) {- lsx_fail("Output must have known number of channels");- return(SOX_EOF);
- }
-
- if ((ichan != 1 && ichan != 2 && ichan != 4 &&
- mixer->mix != MIX_CENTER && ochan != 1)
- || (ochan != 1 && ochan != 2 && ochan != 4)) {- lsx_fail("Can't mix %d -> %d channels", ichan, ochan);- return (SOX_EOF);
- }
-
- /* Handle the special-case flags */
- switch (mixer->mix) {- case MIX_CENTER:
- if (ichan == ochan)
- return SOX_EFF_NULL;
- break; /* Code below will handle this case */
- case 'l':
- if (ichan == 2 && ochan == 1)
- {- pans[0] = 1.0;
- pans[1] = 0.0;
- mixer->num_pans = 2;
- }
- else if (ichan == 4 && ochan == 1)
- {- pans[0] = 0.5;
- pans[1] = 0.0;
- pans[2] = 0.5;
- pans[3] = 0.0;
- mixer->num_pans = 4;
- }
- else
- {- lsx_fail("Can't mix -%c %d -> %d channels", mixer->mix, ichan, ochan);- return SOX_EOF;
- }
- break;
- case 'r':
- if (ichan == 2 && ochan == 1)
- {- pans[0] = 0.0;
- pans[1] = 1.0;
- mixer->num_pans = 2;
- }
- else if (ichan == 4 && ochan == 1)
- {- pans[0] = 0.0;
- pans[1] = 0.5;
- pans[2] = 0.0;
- pans[3] = 0.5;
- mixer->num_pans = 4;
- }
- else
- {- lsx_fail("Can't mix -%c %d -> %d channels", mixer->mix, ichan, ochan);- return SOX_EOF;
- }
- break;
- case 'f':
- if (ichan == 4 && ochan == 2)
- {- pans[0] = 1.0;
- pans[1] = 0.0;
- mixer->num_pans = 2;
- }
- else if (ichan == 4 && ochan == 1)
- {- pans[0] = 0.5;
- pans[1] = 0.5;
- pans[2] = 0.0;
- pans[3] = 0.0;
- mixer->num_pans = 4;
- }
- else
- {- lsx_fail("Can't mix -%c %d -> %d channels", mixer->mix, ichan, ochan);- return SOX_EOF;
- }
- break;
- case 'b':
- if (ichan == 4 && ochan == 2)
- {- pans[0] = 0.0;
- pans[1] = 1.0;
- mixer->num_pans = 2;
- }
- else if (ichan == 4 && ochan == 1)
- {- pans[0] = 0.0;
- pans[1] = 0.0;
- pans[2] = 0.5;
- pans[3] = 0.5;
- mixer->num_pans = 4;
- }
- else
- {- lsx_fail("Can't mix -%c %d -> %d channels", mixer->mix, ichan, ochan);- return SOX_EOF;
- }
- break;
- case '1':
- if (ichan == 2 && ochan == 1)
- {- pans[0] = 1.0;
- pans[1] = 0.0;
- mixer->num_pans = 2;
- }
- else if (ichan == 4 && ochan == 1)
- {- pans[0] = 1.0;
- pans[1] = 0.0;
- pans[2] = 0.0;
- pans[3] = 0.0;
- mixer->num_pans = 4;
- }
- else
- {- lsx_fail("Can't mix -%c %d -> %d channels", mixer->mix, ichan, ochan);- return SOX_EOF;
- }
- break;
- case '2':
- if (ichan == 2 && ochan == 1)
- {- pans[0] = 0.0;
- pans[1] = 1.0;
- mixer->num_pans = 2;
- }
- else if (ichan == 4 && ochan == 1)
- {- pans[0] = 0.0;
- pans[1] = 1.0;
- pans[2] = 0.0;
- pans[3] = 0.0;
- mixer->num_pans = 4;
- }
- else
- {- lsx_fail("Can't mix -%c %d -> %d channels", mixer->mix, ichan, ochan);- return SOX_EOF;
- }
- break;
-
- case '3':
- if (ichan == 4 && ochan == 1)
- {- pans[0] = 0.0;
- pans[1] = 0.0;
- pans[2] = 1.0;
- pans[3] = 0.0;
- mixer->num_pans = 4;
- }
- else
- {- lsx_fail("Can't mix -%c %d -> %d channels", mixer->mix, ichan, ochan);- return SOX_EOF;
- }
- break;
-
- case '4':
- if (ichan == 4 && ochan == 1)
- {- pans[0] = 0.0;
- pans[1] = 0.0;
- pans[2] = 0.0;
- pans[3] = 1.0;
- mixer->num_pans = 4;
- }
- else
- {- lsx_fail("Can't mix -%c %d -> %d channels", mixer->mix, ichan, ochan);- return SOX_EOF;
- }
- break;
-
- case MIX_SPECIFIED:
- break;
- default:
- lsx_fail("Unknown mix option");- return SOX_EOF;
- }
-
- /* If number of pans is 4 or less then its a shorthand
- * representation. If user specified it, then we have
- * garbage in our sources[][] array. Need to clear that
- * now that all data is stored in pans[] array.
- */
- if (mixer->num_pans <= 4)
- {- for (i = 0; i < ichan; i++)
- {- for (j = 0; j < ochan; j++)
- {- mixer->sources[i][j] = 0;
- }
- }
- }
-
- /* If the number of pans given is 4 or fewer, handle the special */
- /* cases listed in the comments above. The code is lengthy but */
- /* straightforward. */
- if (mixer->num_pans == 0) {- /* CASE 1 */
- if (ichan == 1 && ochan > ichan) {- mixer->sources[0][0] = 1.0;
- mixer->sources[0][1] = 1.0;
- mixer->sources[0][2] = 1.0;
- mixer->sources[0][3] = 1.0;
- }
- /* CASE 2, 6 */
- else if (ochan == 1) {- mixer->sources[0][0] = 1.0 / ichan;
- }
- /* CASE 5 */
- else if (ichan == 2 && ochan == 4) {- mixer->sources[0][0] = 1.0;
- mixer->sources[0][2] = 1.0;
- mixer->sources[1][1] = 1.0;
- mixer->sources[1][3] = 1.0;
- }
- /* CASE 7 */
- else if (ichan == 4 && ochan == 2) {- mixer->sources[0][0] = 0.5;
- mixer->sources[1][1] = 0.5;
- mixer->sources[2][0] = 0.5;
- mixer->sources[3][1] = 0.5;
- }
- else {- lsx_fail("You must specify at least one mix level when using mixer with an unusual number of channels.");- return(SOX_EOF);
- }
- }
- else if (mixer->num_pans == 1) {- /* Might be volume change or balance change */
- /* CASE 3 and CASE 8 */
- if ((ichan == 2 || ichan == 4) && ichan == ochan) {- /* -1 is left only, 1 is right only */
- if (pans[0] <= 0.0) {- mixer->sources[1][1] = pans[0] + 1.0;
- if (mixer->sources[1][1] < 0.0)
- mixer->sources[1][1] = 0.0;
- mixer->sources[0][0] = 1.0;
- }
- else {- mixer->sources[0][0] = 1.0 - pans[0];
- if (mixer->sources[0][0] < 0.0)
- mixer->sources[0][0] = 0.0;
- mixer->sources[1][1] = 1.0;
- }
- if (ichan == 4) {- mixer->sources[2][2] = mixer->sources[0][0];
- mixer->sources[3][3] = mixer->sources[1][1];
- }
- }
- else
- {- lsx_fail("Invalid options while not mixing");- return SOX_EOF;
- }
- }
- else if (mixer->num_pans == 2) {- /* CASE 2 */
- if (ichan == 2 && ochan == 1) {- mixer->sources[0][0] = pans[0];
- mixer->sources[1][0] = pans[1];
- }
- /* CASE 7 */
- else if (ichan == 4 && ochan == 2) {- mixer->sources[0][0] = pans[0];
- mixer->sources[1][1] = pans[0];
- mixer->sources[2][0] = pans[1];
- mixer->sources[3][1] = pans[1];
- }
- /* CASE 8 */
- else if (ichan == 4 && ochan == 4) {- /* pans[0] is front -> front, pans[1] is for back */
- mixer->sources[0][0] = pans[0];
- mixer->sources[1][1] = pans[0];
- mixer->sources[2][2] = pans[1];
- mixer->sources[3][3] = pans[1];
- }
- else
- {- lsx_fail("Invalid options for this channel combination");- return SOX_EOF;
- }
- }
- else if (mixer->num_pans == 3) {- lsx_fail("Invalid options while not mixing");- return SOX_EOF;
- }
- else if (mixer->num_pans == 4) {- /* CASE 4 */
- if (ichan == 2 && ochan == 2) {- /* Shorthand for 2-channel case */
- mixer->sources[0][0] = pans[0];
- mixer->sources[0][1] = pans[1];
- mixer->sources[1][0] = pans[2];
- mixer->sources[1][1] = pans[3];
- }
- /* CASE 6 */
- else if (ichan == 4 && ochan == 1) {- mixer->sources[0][0] = pans[0];
- mixer->sources[1][0] = pans[1];
- mixer->sources[2][0] = pans[2];
- mixer->sources[3][0] = pans[3];
- }
- else
- {- lsx_fail("Invalid options for this channel combination");- return SOX_EOF;
- }
- }
-
- if (effp->in_signal.mult) {- double max_sum = 0;
-
- for (j = 0; j < (int)effp->out_signal.channels; ++j) {- double sum = 0;
- for (i = 0; i < (int)effp->in_signal.channels; ++i)
- sum += fabs(mixer->sources[mixer->mix == MIX_CENTER? 0 : i][j]);
- max_sum = max(max_sum, sum);
- }
- if (max_sum > 1)
- *effp->in_signal.mult /= max_sum;
- }
-
- if (effp->in_signal.channels != effp->out_signal.channels)
- return SOX_SUCCESS;
-
- for (i = 0; i < (int)effp->in_signal.channels; ++i)
- for (j = 0; j < (int)effp->out_signal.channels; ++j)
- if (mixer->sources[i][j] != (i == j))
- return SOX_SUCCESS;
-
- return SOX_EFF_NULL;
-}
-
-/*
- * Process either isamp or osamp samples, whichever is smaller.
- */
-
-static int flow(sox_effect_t * effp, const sox_sample_t *ibuf, sox_sample_t *obuf,
- size_t *isamp, size_t *osamp)
-{- priv_t * mixer = (priv_t *) effp->priv;
- size_t len, done;
- int ichan, ochan;
- int i, j;
- double samp;
-
- ichan = effp->in_signal.channels;
- ochan = effp->out_signal.channels;
- len = *isamp / ichan;
- if (len > *osamp / ochan)
- len = *osamp / ochan;
- for (done = 0; done < len; done++, ibuf += ichan, obuf += ochan) {- for (j = 0; j < ochan; j++) {- samp = 0.0;
- for (i = 0; i < ichan; i++)
- samp += ibuf[i] * mixer->sources[mixer->mix == MIX_CENTER? 0 : i][j];
- SOX_SAMPLE_CLIP_COUNT(samp, effp->clips);
- obuf[j] = samp;
- }
- }
- *isamp = len * ichan;
- *osamp = len * ochan;
- return (SOX_SUCCESS);
-}
-
-sox_effect_handler_t const * lsx_mixer_effect_fn(void)
-{- static sox_effect_handler_t handler = {- "mixer",
- "[ -l | -r | -f | -b | -1 | -2 | -3 | -4 | n,n,n...,n ]",
- SOX_EFF_MCHAN | SOX_EFF_CHAN | SOX_EFF_GAIN | SOX_EFF_DEPRECATED,
- getopts, start, flow, 0, 0, 0, sizeof(priv_t)
- };
- return &handler;
-}
--- a/src/sox.c
+++ b/src/sox.c
@@ -1377,7 +1377,7 @@
{/* Not very useful, eh! Sample though of the place you
* could change the value to effects options
- * like vol or speed or mixer.
+ * like vol or speed or remix.
* Modify values in user_effargs[current_eff_chain][xxx]
* and then chain will be drain()ed and restarted whence
* this function is existed.