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WebSVN – planix.SVN – Blame – /os/branches/feature_unix/sys/src/games/music/playlistfs/volume.c – Rev 2

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#include <u.h>
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#include <libc.h>
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#include <thread.h>
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#include <fcall.h>
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#include "pool.h"
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#include "playlist.h"
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int	minvolume, maxvolume;
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void
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volumeproc(void *)
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{
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	int fd, n, nf, i, nlines;
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	static char buf[1024];
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	char *lines[32];
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	char *fields[8];
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	char *subfields[9];
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	int volume[8], nvolumes;
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	threadsetname("volumeproc");
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	close(srvfd[1]);
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	fd = open("/dev/audioctl", OREAD);
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	if (fd < 0)
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		threadexits(nil);
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	for(;;){
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		n = read(fd, buf, sizeof buf -1);
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		if (n == 0)
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			continue;
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		if (n < 0){
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			fprint(2, "volumeproc: read: %r\n");
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			threadexits("volumeproc");
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		}
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		buf[n] = '\0';
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		nlines = getfields(buf, lines, nelem(lines), 1, "\n");
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		for(i = 0; i < nlines; i++){
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			nf = tokenize(lines[i], fields, nelem(fields));
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			if (nf == 0)
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				continue;
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			if (nf != 6 || strcmp(fields[0], "volume") || strcmp(fields[1], "out"))
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				continue;
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			minvolume = strtol(fields[3], nil, 0);
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			maxvolume = strtol(fields[4], nil, 0);
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			if (minvolume >= maxvolume)
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				continue;
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			nvolumes = tokenize(fields[2], subfields, nelem(subfields));
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			if (nvolumes <= 0 || nvolumes > 8)
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				sysfatal("bad volume data");
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			if (debug)
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				fprint(2, "volume changed to '");
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			for (i = 0; i < nvolumes; i++){
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				volume[i] = strtol(subfields[i], nil, 0);
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				volume[i]= 100*(volume[i]- minvolume)/(maxvolume-minvolume);
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				if (debug)
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					fprint(2, " %d", volume[i]);
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			}
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			if (debug)
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				fprint(2, "'\n");
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			while (i < 8)
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				volume[i++] = Undef;
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			send(volumechan, volume);
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		}
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	}
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}
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void
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volumeset(int *v)
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{
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	int fd, i;
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	char buf[256], *p;
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	fd = open("/dev/audioctl", OWRITE);
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	if (fd < 0){
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		fd = open("/dev/volume", OWRITE);
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		if (fd < 0){
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			fprint(2, "Can't set volume: %r");
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			return;
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		}
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		fprint(fd, "audio out %d",  v[0]);
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		send(volumechan, v);
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	} else {
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		p = buf;
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		for (i = 0; i < 8; i++){
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			if (v[i] == Undef) break;
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			p = seprint(p, buf+sizeof buf, (p==buf)?"volume out '%d":" %d",
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				minvolume + v[i] * (maxvolume-minvolume) / 100);
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		}
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		p = seprint(p, buf+sizeof buf, "'\n");
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		write(fd, buf, p-buf);
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	}
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	close(fd);
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}