Audio frequency generator: Difference between revisions
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$sound stop
exit</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_frequency_generator.wren */
class C {
foreign static getInput(maxSize)
foreign static play(args)
}
var freq = 0
while (!freq || !freq.isInteger || freq < 40 || freq > 10000) {
System.write("Enter frequency in HZ (40 to 10000) : ")
freq = Num.fromString(C.getInput(5))
}
var freqS = freq.toString
var vol = 0
while (!vol || vol < 1 || vol > 50) {
System.write("Enter volume in dB (1 to 50) : ")
vol = Num.fromString(C.getInput(2))
}
var volS = vol.toString
var dur = 0
while (!dur || dur < 2 || dur > 10) {
System.write("Enter duration in seconds (2 to 10) : ")
dur = Num.fromString(C.getInput(2))
}
var durS = dur.toString
var kind = 0
while (!kind || !kind.isInteger || kind < 1 || kind > 3) {
System.write("Enter kind (1 = Sine, 2 = Square, 3 = Sawtooth) : ")
kind = Num.fromString(C.getInput(1))
}
var kindS = "sine"
if (kind == 2) {
kindS = "square"
} else if (kind == 3) {
kindS = "sawtooth"
}
var args = ["-n", "-V1", "synth", durS, kindS, freqS, "vol", volS, "dB"].join(" ")
C.play(args)</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_frequency_generator.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>
=={{header|ZX Spectrum Basic}}==
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