Audio overlap loop: Difference between revisions
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make_gui
</lang>
=={{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.
<lang ecmascript>/* 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(" "))</lang>
<br>
We now embed this in the following C program, compile and run it.
<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;
}</lang>
{{omit from|Bc}}
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