66 lines
2.4 KiB
JavaScript
66 lines
2.4 KiB
JavaScript
#!/usr/bin/env node
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const fs = require('fs');
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const parseOptions = require("./parseOptions");
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const { samples2wav } = require("./samples2wav");
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const { bytesToBits } = require("./bytes2bits");
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const { bitsToSamples } = require("./bits2samples");
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const { checksum_byte } = require("./checksum");
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const { hex } = require("./hex");
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const { ACI } = require("./aci");
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const options = parseOptions([
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{ name: 'input', alias: 'i', type: String },
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{ name: 'output', alias: 'o', type: String },
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{ name: 'samplerate', alias: 's', type: Number },
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{ name: 'binary', alias: 'b', type: String }
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]);
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if(options.input === undefined || options.output === undefined) {
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console.log("usage: prg2wav -i inputfile.prg -o outputfile [-s samplerate] [-b hexaddress]");
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console.log("");
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console.log("The input is a binary file with two bytes start address header (usually with .prg extension).");
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console.log("If -b <hexaddress> is specified, the input file is treated as a binary with no header");
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console.log("and the start address must be specified (in hexadecimal format).");
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console.log("Samplerate is the rate of the output WAV file (44100 Hz default)");
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process.exit(-1);
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}
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let samplerate = options.samplerate == undefined ? 44100 : options.samplerate;
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let binfile,startaddress;
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if(options.binary) {
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binfile = fs.readFileSync(options.input);
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startaddress = parseInt(options.binary,16);
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}
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else {
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let prgfile = fs.readFileSync(options.input);
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startaddress = prgfile[0]+prgfile[1]*256;
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binfile = prgfile.slice(2);
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}
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let endaddress = startaddress + binfile.length - 1;
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// header is composed of a 10 seconds of long cycles ("1") ending with a short cyles ("0")
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let header = new Uint8Array(1250).fill(255);
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let startbyte = 254; // 7 long cycles and a short one as start bit
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let checksum = checksum_byte(binfile);
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let slipbytes = [ 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE ];
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let data = [ ...header, startbyte, ...binfile, checksum, ...slipbytes ];
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let bits = bytesToBits(data);
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let samples = bitsToSamples(bits, samplerate, ACI.one, ACI.zero);
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let wavfile = samples2wav(samples, samplerate);
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let wavName = options.output;
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let s_start = hex(startaddress,4);
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let s_end = hex(endaddress,4);
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wavName = `${wavName}_${s_start}.${s_end}R.wav`;
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fs.writeFileSync(wavName, wavfile);
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console.log(`file "${wavName}" generated, load it on the Apple-1 with:`);
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console.log(`C100R (RETURN) ${s_start}.${s_end}R (RETURN)`);
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console.log(``);
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