Audio overlap loop: Difference between revisions
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[[Category:Temporal media]]
{{draft task}}
'''Audio Overlap Loop''' is a program that
Optionally take parameters for delay between repetitions, and decay (fractional volume reduction between consecutive repetitions).
=={{header|Delphi}}==
{{libheader| System.SysUtils}}
{{libheader| Winapi.Windows}}
{{libheader| Winapi.MMSystem}}
<syntaxhighlight lang="delphi">
program Audio_Overlap_Loop;
{$APPTYPE CONSOLE}
uses
System.SysUtils,
Winapi.Windows,
Winapi.MMSystem;
function QueryIntNumber(Msg: string; min, max: Integer): Integer;
var
val: string;
begin
Result := 0;
repeat
Writeln(Msg);
Readln(val);
if not TryStrToInt(val, Result) then
begin
Writeln('"', val, '" is not a valid number.');
Continue;
end;
if Result < min then
begin
Writeln('"', val, '" must be greater then ', min);
Continue;
end;
if (Result > max) then
begin
Writeln('"', val, '" must be lower then ', max);
Continue;
end;
Break;
until True;
end;
function QueryFloatNumber(Msg: string; min, max: double): double;
var
val: string;
begin
Result := 0;
repeat
Writeln(Msg);
Readln(val);
// acept ',' ou '.' as decimal separator
val := val.Replace(',',FormatSettings.DecimalSeparator);
val := val.Replace('.',FormatSettings.DecimalSeparator);
if not TryStrToFloat(val, Result) then
begin
Writeln('"', val, '" is not a valid number.');
Continue;
end;
if Result < min then
begin
Writeln('"', val, '" must be greater then ', min);
Continue;
end;
if (Result > max) then
begin
Writeln('"', val, '" must be lower then ', max);
Continue;
end;
Break;
until True;
end;
procedure SetWaveVolume(Volume: Double);
var
Caps: TWAVEOUTCAPS;
aVolume: Cardinal;
VolumeCanal: Word;
begin
VolumeCanal := Trunc(Volume * word(-1) / 100.0);
aVolume := MakeLong(VolumeCanal, VolumeCanal);
if WaveOutGetDevCaps(WAVE_MAPPER, @Caps, sizeof(Caps)) = MMSYSERR_NOERROR then
if Caps.dwSupport and WAVECAPS_VOLUME = WAVECAPS_VOLUME then
WaveOutSetVolume(WAVE_MAPPER, aVolume);
end;
procedure Play(music: string; volume: Double = 100.0; delayMs: Cardinal = 0);
begin
SetWaveVolume(volume);
PlaySound(Pchar(music), SND_SYNC, 0);
if delayMs > 0 then
Sleep(delayMs);
end;
var
vol: Double = 100.0;
i: Integer;
rep: Integer;
delay: DWORD;
decay: Double;
begin
rep := QueryIntNumber('Enter number of repetitions (1 to 20) : ', 1, 20);
delay := QueryIntNumber('Enter delay between repetitions in milliseconds (0 to 1000) : ',
0, 1000);
decay := QueryFloatNumber('Enter decay between repetitions (0.01 to 0.99) : ',
0.01, 0.99);
for i := 1 to rep do
begin
Play('echo.wav', vol, delay);
vol := vol * (1 - decay);
end;
end.</syntaxhighlight>
{{out}}
<pre>Enter number of repetitions (1 to 20) :
5
Enter delay between repetitions in milliseconds (0 to 1000) :
0
Enter decay between repetitions (0.01 to 0.99) :
0.2</pre>
=={{header|FreeBASIC}}==
{{libheader| FMOD}}
[https://www.fmod.com/core Library FMOD]
<syntaxhighlight lang="vbnet">#Include "fmod.bi"
Sub PlaySound (nombrearchivo As String, repeticiones As Integer, retardo As Integer, decaimiento As Single)
Dim As Single volumen = 1.0
Dim As Integer canal, sonido
' Initialize FMOD
FSOUND_Init(44100, 32, 0)
For i As Integer = 1 To repeticiones
' Cargar el archivo de sonido
sonido = FSOUND_Sample_Load(FSOUND_FREE, nombrearchivo, FSOUND_NORMAL, 0, 0)
If sonido = 0 Then
Print "Error: Failed to load the sample!"
FSOUND_Close
Exit Sub 'END
End If
' Play the sound at the current volume
canal = FSOUND_PlaySound(FSOUND_FREE, sonido)
FSOUND_SetVolume(canal, volumen * 255) ' FMOD uses a volume range of 0 to 255
' Wait for the specified delay
Sleep retardo
' Apply the decay
volumen *= decaimiento
' Release the sound
FSOUND_Sample_Free(sonido)
Next i
' Close FMOD
FSOUND_Close
End Sub
Dim As Integer repeticiones, retardo
Dim As Single decaimiento
' Get the parameters from the user
Input "Enter the number of repeticiones: ", repeticiones
Input "Enter the retardo between repeticiones (in milliseconds): ", retardo
Input "Enter the decaimiento factor (between 0 and 1): ", decaimiento
' Play the sound
PlaySound("loop.wav", repeticiones, retardo, decaimiento)</syntaxhighlight>
=={{header|Go}}==
As Go does not have any audio support in its standard library, this invokes the SoX utility's 'play' command with the appropriate parameters to achieve the 'echo chamber' effect.
<syntaxhighlight lang="go">package main
import (
"bufio"
"fmt"
"log"
"os"
"os/exec"
"strconv"
)
func check(err error) {
if err != nil {
log.Fatal(err)
}
}
func main() {
fileName := "loop.wav"
scanner := bufio.NewScanner(os.Stdin)
reps := 0
for reps < 1 || reps > 6 {
fmt.Print("Enter number of repetitions (1 to 6) : ")
scanner.Scan()
input := scanner.Text()
check(scanner.Err())
reps, _ = strconv.Atoi(input)
}
delay := 0
for delay < 50 || delay > 500 {
fmt.Print("Enter delay between repetitions in microseconds (50 to 500) : ")
scanner.Scan()
input := scanner.Text()
check(scanner.Err())
delay, _ = strconv.Atoi(input)
}
decay := 0.0
for decay < 0.2 || decay > 0.9 {
fmt.Print("Enter decay between repetitions (0.2 to 0.9) : ")
scanner.Scan()
input := scanner.Text()
check(scanner.Err())
decay, _ = strconv.ParseFloat(input, 64)
}
args := []string{fileName, "echo", "0.8", "0.7"}
decay2 := 1.0
for i := 1; i <= reps; i++ {
delayStr := strconv.Itoa(i * delay)
decay2 *= decay
decayStr := strconv.FormatFloat(decay2, 'f', -1, 64)
args = append(args, delayStr, decayStr)
}
cmd := exec.Command("play", args...)
err := cmd.Run()
check(err)
}</syntaxhighlight>
=={{header|JavaScript}}/{{header|HTML}}==
<
for(i=0; i<j; i++) {
document.write("<bgsound src='loop.wav'>")
}
</script></syntaxhighlight>
=={{header|Julia}}==
Uses Julia's ability to run iterations of a 4 loop in separate threads to play a file 4 times, with each play 0.1 seconds out of sync with the previous play. Requires available threads on the CPU at Julia startup.
<syntaxhighlight lang="julia">const soundfile = "loop.wav"
if length(ARGS) < 1
println("Usage: give number of repetitions in echo effect as argument to the program.")
else
((repetitions = tryparse(Int, ARGS[1])) != nothing) || (repetitions = 3)
(repetitions < 1) && (repetitions = 3)
(repetitions > Threads.nthreads()) && (repetitions = Threads.nthreads())
@Threads.threads for secs in 0.0:0.1:((repetitions - 1) * 0.1)
begin sleep(secs); run(`play "$soundfile"`); end
end
end
</syntaxhighlight>
=={{header|Nim}}==
{{trans|Go}}
As in Go version, we use Sox "play" command.
<syntaxhighlight lang="nim">import osproc, strutils
proc getValue[T: int | float](msg: string; minval, maxval: T): T =
while true:
stdout.write msg
stdout.flushFile()
try:
result = when T is int: stdin.readLine.strip().parseInt()
else: stdin.readLine.strip().parseFloat()
if result notin minval..maxval:
echo "Invalid value"
else:
return
except ValueError:
echo "Error: invalid value."
except EOFError:
echo()
quit "Quitting.", QuitFailure
const FileName = "loop.wav"
let reps = getValue("Enter number of repetitions (1 to 6): ", 1, 6)
let delay = getValue("Enter delay between repetitions in microseconds (50 to 500): ", 50, 500)
let decay = getValue("Enter decay between repetitions (0.2 to 0.9): ", 0.2, 0.9)
var args = @[FileName, "echo", "0.8", "0.7"]
var decay2 = 1.0
for i in 1..reps:
decay2 *= decay
args.add $(i * delay)
args.add $decay2
echo execProcess("play", args = args, options = {poStdErrToStdOut, poUsePath})</syntaxhighlight>
=={{header|Phix}}==
<!--<syntaxhighlight lang="phix">(phixonline)-->
<span style="color: #000080;font-style:italic;">--
-- demo\rosetta\AudioOverlapLoop.exw
-- =================================
--</span>
<span style="color: #008080;">constant</span> <span style="color: #000000;">dl</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">`Download rosetta\bass\ from http://phix.x10.mx/pmwiki/pmwiki.php?n=Main.Bass`</span>
<span style="color: #7060A8;">assert</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">get_file_type</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"bass"</span><span style="color: #0000FF;">)=</span><span style="color: #004600;">FILETYPE_DIRECTORY</span><span style="color: #0000FF;">,</span><span style="color: #000000;">dl</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">include</span> <span style="color: #000000;">bass</span><span style="color: #0000FF;">\</span><span style="color: #000000;">bass</span><span style="color: #0000FF;">.</span><span style="color: #000000;">e</span>
<span style="color: #000000;">BASS_Init</span><span style="color: #0000FF;">(-</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">44100</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #000000;">5</span> <span style="color: #008080;">do</span>
<span style="color: #004080;">atom</span> <span style="color: #000000;">filePlayerHandle</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">BASS_StreamCreateFile</span><span style="color: #0000FF;">(</span><span style="color: #004600;">false</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">`bass\Scream01.mp3`</span><span style="color: #0000FF;">)</span>
<span style="color: #000000;">BASS_ChannelPlay</span><span style="color: #0000FF;">(</span><span style="color: #000000;">filePlayerHandle</span><span style="color: #0000FF;">)</span>
<span style="color: #7060A8;">sleep</span><span style="color: #0000FF;">(</span><span style="color: #000000;">0.2</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
<span style="color: #0000FF;">?</span><span style="color: #008000;">"done"</span>
<span style="color: #0000FF;">{}</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">wait_key</span><span style="color: #0000FF;">()</span>
<!--</syntaxhighlight>-->
The distributed version also has a loop/wait for all channels to finish playing
before terminating the program, or you could just use sleep() or as above wait_key().
=={{header|Tcl}}==
Using the popular [http://www.speech.kth.se/snack/ snack] ([http://wiki.tcl.tk/2647 wiki]) extension for audio support, the following presents a GUI to control echo production.
This uses a couple of interesting Tcl features:
* GUI widgets bound to global variables
* playback runs in a coroutine to provide asynchrony with yield
* <tt>lock_play</tt> provides a "transaction"-style control structure similar to "with" in [Python] or (with-*) in [Lisp]
As a bonus, two playback methods are provided - <tt>run</tt> and <tt>mix</tt>, which exercise different capabilities of snack (playing multiple sounds at once vs programmable filters).
Notice that <tt>run</tt> disabled buttons only until the last echo has started, while <tt>mix</tt> does so until the entire playback (cropped to sound level 0) is completed.
Either of these may be desirable in different circumstances, so both are left as an example.
<syntaxhighlight lang="tcl">package require Tk
package require snack
# variables bound to GUI:
set filename "sample.wav"
set nreps 5
set delay 200
set decay 0.9
# initial snack objects:
snack::sound wav -load sample.wav
snack::sound mixed ;# used by [run]
snack::sound out ;# used by [mix]
snack::sound hush -rate [wav cget -rate] -channels [wav cget -channels]
hush length [wav length]
proc make_gui {} {
grid [label .l0 -text "Filename:"] [button .b0 -textvariable ::filename -command choose_file] -sticky nsew
grid [label .l1 -text "Repetitions"] [entry .e1 -textvariable ::nreps] -sticky nsew
grid [label .l2 -text "Pause"] [entry .e2 -textvariable ::delay] -sticky nsew
grid [label .l3 -text "Decay"] [entry .e3 -textvariable ::decay] -sticky nsew
grid [frame .b] - ;# "-" for colspan
grid [
button .b.run -text "Play" -command {coroutine runner run}
] [
button .b.mix -text "Premix" -command {coroutine runner mix}
] [
button .b.stop -text "Stop" -command stop -state disabled
] [
button .b.exit -text "Exit" -command exit
] -sticky nsew
}
# snack wraps tk_getOpenFile with suitable options to load supported audio files
proc choose_file {} {
global filename
set fn [snack::getOpenFile -initialfile $filename]
if {$fn eq ""} return
wav read [set filename $fn]
}
# disable play and enable stop for the duration of $script
proc lock_play {script} {
.b.run configure -state disabled
.b.mix configure -state disabled
.b.stop configure -state normal
try {
uplevel 1 $script
} finally {
.b.run configure -state normal
.b.mix configure -state normal
.b.stop configure -state disabled
}
}
# play by starting each echo as a distinct sound
proc run {} {
global nreps delay decay
lock_play {
mixed copy wav
mixed play
for {set i 1} {$i < $nreps} {incr i} {
yieldto after $delay [list catch [info coroutine]] ;# delay without blocking the event loop
;# [catch] in case the coroutine has been killed
mixed mix hush -prescaling $decay ;# scale and mix with silence to fade
mixed play
}
}
}
# play using snack::filter to create the echo
proc mix {} {
global nreps delay decay
lock_play {
out copy wav
set args {} ;# for snack::filter echo
for {set i 1} {$i < $nreps} {incr i} {
lappend args [expr {$delay * $i}] [expr {$decay ** $i}]
}
set filter [snack::filter echo 1 1 {*}$args]
out filter $filter
$filter destroy
yieldto out play -command [info coroutine] ;# return to this proc only when playback completed
}
}
# stop playback
proc stop {} {
lock_play {
foreach s {wav mixed out} {
$s stop ;# stop all sounds that may be playing
catch {rename runner {}} ;# kill the coroutine if it exists
}
}
}
make_gui
</syntaxhighlight>
=={{header|Wren}}==
{{trans|Go}}
The ability to call external processes such as ''SoX'' is expected to be added to Wren-cli in the next release. In the meantime, we embed the following Wren script in a C host to complete this task.
<syntaxhighlight lang="wren">/* Audio_overlap_loop.wren */
class C {
foreign static getInput(maxSize)
foreign static play(args)
}
var fileName = "loop.wav"
var reps = 0
while (!reps || !reps.isInteger || reps < 1 || reps > 6) {
System.write("Enter number of repetitions (1 to 6) : ")
reps = Num.fromString(C.getInput(1))
}
var delay = 0
while (!delay || !delay.isInteger || delay < 50 || delay > 500) {
System.write("Enter delay between repetitions in microseconds (50 to 500) : ")
delay = Num.fromString(C.getInput(3))
}
var decay = 0
while (!decay || decay < 0.2 || decay > 0.9) {
System.write("Enter decay between repetitions (0.2 to 0.9) : ")
decay = Num.fromString(C.getInput(5))
}
var args = [fileName, "-V1", "echo", "0.8", "0.7"]
var decay2 = 1
for (i in 1..reps) {
var delayS = (i * delay).toString
decay2 = decay2 * decay
var decayS = decay2.toString
args.add(delayS)
args.add(decayS)
}
C.play(args.join(" "))</syntaxhighlight>
<br>
We now embed this in the following C program, compile and run it.
<syntaxhighlight lang="c">#include <stdio.h>
#include <stdio_ext.h>
#include <stdlib.h>
#include <string.h>
#include "wren.h"
void C_getInput(WrenVM* vm) {
int maxSize = (int)wrenGetSlotDouble(vm, 1) + 2;
char input[maxSize];
fgets(input, maxSize, stdin);
__fpurge(stdin);
input[strcspn(input, "\n")] = 0;
wrenSetSlotString(vm, 0, (const char*)input);
}
void C_play(WrenVM* vm) {
const char *args = wrenGetSlotString(vm, 1);
char command[strlen(args) + 5];
strcpy(command, "play ");
strcat(command, args);
system(command);
}
WrenForeignMethodFn bindForeignMethod(
WrenVM* vm,
const char* module,
const char* className,
bool isStatic,
const char* signature) {
if (strcmp(module, "main") == 0) {
if (strcmp(className, "C") == 0) {
if (isStatic && strcmp(signature, "getInput(_)") == 0) return C_getInput;
if (isStatic && strcmp(signature, "play(_)") == 0) return C_play;
}
}
return NULL;
}
static void writeFn(WrenVM* vm, const char* text) {
printf("%s", text);
}
void errorFn(WrenVM* vm, WrenErrorType errorType, const char* module, const int line, const char* msg) {
switch (errorType) {
case WREN_ERROR_COMPILE:
printf("[%s line %d] [Error] %s\n", module, line, msg);
break;
case WREN_ERROR_STACK_TRACE:
printf("[%s line %d] in %s\n", module, line, msg);
break;
case WREN_ERROR_RUNTIME:
printf("[Runtime Error] %s\n", msg);
break;
}
}
char *readFile(const char *fileName) {
FILE *f = fopen(fileName, "r");
fseek(f, 0, SEEK_END);
long fsize = ftell(f);
rewind(f);
char *script = malloc(fsize + 1);
fread(script, 1, fsize, f);
fclose(f);
script[fsize] = 0;
return script;
}
int main(int argc, char **argv) {
WrenConfiguration config;
wrenInitConfiguration(&config);
config.writeFn = &writeFn;
config.errorFn = &errorFn;
config.bindForeignMethodFn = &bindForeignMethod;
WrenVM* vm = wrenNewVM(&config);
const char* module = "main";
const char* fileName = "Audio_overlap_loop.wren";
char *script = readFile(fileName);
WrenInterpretResult result = wrenInterpret(vm, module, script);
switch (result) {
case WREN_RESULT_COMPILE_ERROR:
printf("Compile Error!\n");
break;
case WREN_RESULT_RUNTIME_ERROR:
printf("Runtime Error!\n");
break;
case WREN_RESULT_SUCCESS:
break;
}
wrenFreeVM(vm);
free(script);
return 0;
}</syntaxhighlight>
{{omit from|Bc}}
| |||