ref: 41abe98ac77c8a3b54b86264f910f069484bae02
dir: /sys/src/games/dmxdec.c/
#include <u.h> #include <libc.h> #include <fcall.h> enum{ Hdrsz = 2+2+4+16, }; void main(int argc, char **argv) { int n, rate, fd; uchar buf[Hdrsz], *p; char fmt[16], len[16]; fd = 0; if(argc > 1 && (fd = open(argv[1], OREAD)) < 0) sysfatal("open: %r"); if(read(fd, buf, sizeof buf) != sizeof buf) sysfatal("short read: %r"); p = buf; n = GBIT16(p); if(n != 3) /* format number */ sysfatal("invalid dmx file"); p += 2; rate = GBIT16(p); /* sample rate (usually 11025Hz) */ p += 2; n = GBIT32(p); snprint(fmt, sizeof fmt, "u8c1r%d", rate); snprint(len, sizeof len, "%d", n); execl("/bin/audio/pcmconv", "pcmconv", "-i", fmt, "-o", "s16c2r44100", "-l", len, nil); sysfatal("execl: %r"); }