ref: 1018d7a7091fd5e0433f501a3474cdc3fec322cc
dir: /appl/cmd/wav2iaf.b/
implement Wav2Iaf; include "sys.m"; include "draw.m"; include "bufio.m"; sys: Sys; FD: import sys; bufio: Bufio; Iobuf: import bufio; stderr: ref FD; inf: ref Iobuf; prog: string; buff4: array of byte; pad := array[] of { " ", " ", "", " " }; Wav2Iaf: module { init: fn(ctxt: ref Draw->Context, argv: list of string); }; ioerror() { sys->fprint(stderr, "%s: read error: %r\n", prog); exit; } shortfile(diag: string) { sys->fprint(stderr, "%s: short read: %s\n", prog, diag); exit; } error(s: string) { sys->fprint(stderr, "%s: bad wave file: %s\n", prog, s); exit; } get(c: int, s: string) { n := inf.read(buff4, c); if (n < 0) ioerror(); if (n != c) shortfile("expected " + s); } gets(c: int, s: string) : string { get(c, s); return string buff4[0:c]; } need(s: string) { get(4, s); if (string buff4 != s) { sys->fprint(stderr, "%s: not a wave file\n", prog); exit; } } getl(s: string) : int { get(4, s); return int buff4[0] + (int buff4[1] << 8) + (int buff4[2] << 16) + (int buff4[3] << 24); } getw(s: string) : int { get(2, s); return int buff4[0] + (int buff4[1] << 8); } skip(n: int) { while (n > 0) { inf.getc(); n--; } } bufcp(s, d: ref Iobuf, n: int) { while (n > 0) { b := s.getb(); if (b < 0) { if (b == Bufio->EOF) sys->fprint(stderr, "%s: short input file\n", prog); else sys->fprint(stderr, "%s: read error: %r\n", prog); exit; } d.putb(byte b); n--; } } init(nil: ref Draw->Context, argv: list of string) { l: int; a: string; sys = load Sys Sys->PATH; stderr = sys->fildes(2); prog = hd argv; argv = tl argv; bufio = load Bufio Bufio->PATH; if (bufio == nil) sys->fprint(stderr, "%s: could not load %s: %r\n", prog, Bufio->PATH); if (argv == nil) { inf = bufio->fopen(sys->fildes(0), Bufio->OREAD); if (inf == nil) { sys->fprint(stderr, "%s: could not fopen stdin: %r\n", prog); exit; } } else if (tl argv != nil) { sys->fprint(stderr, "usage: %s [infile]\n", prog); exit; } else { inf = bufio->open(hd argv, Sys->OREAD); if (inf == nil) { sys->fprint(stderr, "%s: could not open %s: %r\n", prog, hd argv); exit; } } buff4 = array[4] of byte; need("RIFF"); getl("length"); need("WAVE"); for (;;) { a = gets(4, "tag"); l = getl("length"); if (a == "fmt ") break; skip(l); } if (getw("format") != 1) error("not PCM"); chans := getw("channels"); rate := getl("rate"); getl("AvgBytesPerSec"); getw("BlockAlign"); bits := getw("bits"); l -= 16; do { skip(l); a = gets(4, "tag"); l = getl("length"); } while (a != "data"); outf := bufio->fopen(sys->fildes(1), Sys->OWRITE); if (outf == nil) { sys->fprint(stderr, "%s: could not fopen stdout: %r\n", prog); exit; } s := "rate\t" + string rate + "\n" + "chans\t" + string chans + "\n" + "bits\t" + string bits + "\n" + "enc\tpcm"; outf.puts(s); outf.puts(pad[len s % 4]); outf.puts("\n\n"); bufcp(inf, outf, l); outf.flush(); }