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From: "John S. Dyson" <toor@dyson.iquest.net>
Message-Id: <199612070309.WAA02950@dyson.iquest.net>
Subject: Re: O si o [sound question]
To: S.Brandenburg@tu-bs.de
Date: Fri, 6 Dec 1996 22:09:53 -0500 (EST)
Cc: toor@dyson.iquest.net, freebsd-questions@freebsd.org
In-Reply-To: <32A8CD96.41C67EA6@algieba.ts.rz.tu-bs.de> from "Sven Brandenburg" at Dec 7, 96 02:51:18 am
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> 
> What do you use to play/record ? 
> (which program and how configured, tell me everything :) 
> Should a "cat iama16bitsample.au > /dev/audio" give you 16 bit output? 
> (A BIG candidate for the lame-question-of-the-year, sorry!)
   It isn't lame, I use these...
> 
Record program:

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <machine/soundcard.h>


#define DSP "/dev/dsp"

int dspfd;
int filefd;

main(int argc, char *argv[]) {
	char buffer[256];
	int readcount;
	int toread;
	int parm;

	dspfd = open(DSP, O_RDONLY);
	if (dspfd < 0) {
		perror("dspopen");
		exit(1);
	}

	parm = 16;
	if (ioctl(dspfd, SOUND_PCM_READ_BITS, &parm)) {
		perror("ioctlrd16");
		exit(1);
	}

	parm = 16;
	if (ioctl(dspfd, SOUND_PCM_WRITE_BITS, &parm)) {
		perror("ioctlwr16");
		exit(1);
	}

	parm = 2;
	if (ioctl(dspfd, SOUND_PCM_READ_CHANNELS, &parm)) {
		perror("ioctlrd2");
		exit(1);
	}

	parm = 2;
	if (ioctl(dspfd, SOUND_PCM_WRITE_CHANNELS, &parm)) {
		perror("ioctlwr2");
		exit(1);
	}

	parm = 44100;
	if (ioctl(dspfd, SOUND_PCM_READ_RATE, &parm)) {
		perror("ioctlsp44100");
		exit(1);
	}

	parm = 44100;
	if (ioctl(dspfd, SOUND_PCM_WRITE_RATE, &parm)) {
		perror("ioctlsp44100");
		exit(1);
	}

	filefd = dup(1);

	toread = atoi(argv[1]) * 44100 * 4;
	fprintf(stderr,"%d samples\n", toread);
	while ( toread > 0) {
		readcount = sizeof buffer;
		if (readcount > toread)
			readcount = toread;
		readcount = read(dspfd, buffer, readcount);
		if (readcount < 0) {
			perror("dspread");
			exit(1);
		}		
		write(filefd, buffer, readcount);
		toread -= readcount;
	}

	exit(0);
}

Play program:

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <machine/soundcard.h>


#define DSP "/dev/dsp"

int dspfd;
int filefd;

main(int argc, char *argv[]) {
	char buffer[1024];
	int writecount;
	int toread;
	int parm;
	int sfptr;
	char *readb;
	struct stat statbuf;

	dspfd = open(DSP, O_RDWR);
	if (dspfd < 0) {
		perror("dspopen");
		exit(1);
	}
	
	parm = 16;
	if (ioctl(dspfd, SOUND_PCM_READ_BITS, &parm)) {
		perror("ioctlrd16");
		exit(1);
	}

	parm = 16;
	if (ioctl(dspfd, SOUND_PCM_WRITE_BITS, &parm)) {
		perror("ioctlwr16");
		exit(1);
	}

	parm = 2;
	if (ioctl(dspfd, SOUND_PCM_READ_CHANNELS, &parm)) {
		perror("ioctlrd2");
		exit(1);
	}

	parm = 2;
	if (ioctl(dspfd, SOUND_PCM_WRITE_CHANNELS, &parm)) {
		perror("ioctlwr2");
		exit(1);
	}

	parm = 44100;
	if (ioctl(dspfd, SOUND_PCM_READ_RATE, &parm)) {
		perror("ioctlsp44100");
		exit(1);
	}

	parm = 44100;
	if (ioctl(dspfd, SOUND_PCM_WRITE_RATE, &parm)) {
		perror("ioctlsp44100");
		exit(1);
	}

	sfptr = 0;
	while ( 1) {
		toread = read(0, buffer, sizeof buffer);
		if (toread <= 0)
			break;
		writecount = write(dspfd, buffer, toread);
		if (writecount < 0) {
			perror("dspwrite");
			exit(1);
		}		
	}

	exit(0);
}

John