Audio overlap loop: Difference between revisions
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[[Category:Temporal media]]
{{draft task}}
'''Audio Overlap Loop''' is a program that produces an "echo chamber" effect by playing an audio file several times in an overlapping loop. A repetition level determines the number of times that the file is looped. For the purpose of this task, write a program that takes a parameter for the number of repetitions and plays the file ''loop.wav'' in an overlapping loop according to the number of repetitions.
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{{libheader| Winapi.Windows}}
{{libheader| Winapi.MMSystem}}
<syntaxhighlight lang="delphi">
program Audio_Overlap_Loop;
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vol := vol * (1 - decay);
end;
end.</
{{out}}
<pre>Enter number of repetitions (1 to 20) :
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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.
<
import (
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err := cmd.Run()
check(err)
}</
=={{header|JavaScript}}/{{header|HTML}}==
<
var j = prompt("Enter the sound manipulation level you want", "");
for(i=0; i<j; i++) {
document.write("<bgsound src='loop.wav'>")
}
</script></
=={{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.
<
if length(ARGS) < 1
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end
end
</syntaxhighlight>
=={{header|Nim}}==
{{trans|Go}}
As in Go version, we use Sox "play" command.
<
proc getValue[T: int | float](msg: string; minval, maxval: T): T =
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args.add $(i * delay)
args.add $decay2
echo execProcess("play", args = args, options = {poStdErrToStdOut, poUsePath})</
=={{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}}==
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Either of these may be desirable in different circumstances, so both are left as an example.
<
package require snack
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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}}
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{{omit from|GUISS}}
{{omit from|Lotus 123 Macro Scripting}}
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