ref: 22782a3553d1cbba3978f141a694c68b8d79e1b0
dir: /src/sunaudio.c/
#if defined(SUNAUDIO_PLAYER)
/*
* Copyright 1997 Chris Bagwell And Sundry Contributors
* This source code is freely redistributable and may be used for
* any purpose. This copyright notice must be maintained.
* Rick Richardson, Lance Norskog And Sundry Contributors are not
* responsible for the consequences of using this software.
*/
/* Direct to Sun Audio Driver
*
* Added by Chris Bagwell (cbagwell@sprynet.com) on 2/26/96
* Based on oss driver.
*
* Cleaned up changes of format somewhat in sunstartwrite on 03/31/98
*
*/
#include <sys/ioctl.h>
#ifdef __SVR4
#include <sys/audioio.h>
#else
#include <sun/audioio.h>
#endif
#include <malloc.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <signal.h>
#include "st.h"
#include "libst.h"
static int got_int = 0;
static int abuf_size = 0;
static int abuf_cnt = 0;
static char *audiobuf;
/* This is how we know when to stop recording. User sends interrupt
* (eg. control-c) and then we mark a flag to show we are done.
* Must call "sigint(0)" during init so that the OS can be notified
* what to do.
*/
static void
sigint(s)
int s;
{
fprintf(stderr,"Got SIGINT\n");
if (s) got_int = 1;
else signal(SIGINT, sigint);
}
/*
* Do anything required before you start reading samples.
* Read file header.
* Find out sampling rate,
* size and style of samples,
* mono/stereo/quad.
*/
void sunstartread(ft)
ft_t ft;
{
int samplesize, encoding;
audio_info_t audio_if;
/* Hard code for now. */
abuf_size = 1024;
if ((audiobuf = malloc (abuf_size)) == NULL) {
fail("unable to allocate input buffer of size %d", abuf_size);
}
if (ft->info.rate == 0.0) ft->info.rate = 8000;
if (ft->info.size == -1) ft->info.size = BYTE;
if (ft->info.style == -1) ft->info.style = ULAW;
if (ft->info.size == BYTE) {
samplesize = 8;
if (ft->info.style != ULAW &&
ft->info.style != ALAW &&
ft->info.style != SIGN2) {
fail("Sun Audio driver only supports ULAW, ALAW, and Signed Linear for bytes.");
}
}
else if (ft->info.size == WORD) {
samplesize = 16;
if (ft->info.style != SIGN2) {
fail("Sun Audio driver only supports Signed Linear for words.");
}
}
else {
fail("Sun Audio driver only supports bytes and words");
}
if (ft->info.channels == -1) ft->info.channels = 1;
else if (ft->info.channels > 1) {
report("Warning: some sun audio devices can not play stereo");
report("at all or sometime only with signed words. If the");
report("sound seems sluggish then this is probably the case.");
report("Try forcing output to signed words or use the avg");
report("filter to reduce the number of channels.");
ft->info.channels = 2;
}
/* Read in old values, change to what we need and then send back */
if (ioctl(fileno(ft->fp), AUDIO_GETINFO, &audio_if) < 0) {
fail("Unable to initialize /dev/audio");
}
audio_if.record.precision = samplesize;
audio_if.record.channels = ft->info.channels;
audio_if.record.sample_rate = ft->info.rate;
if (ft->info.style == ULAW)
encoding = AUDIO_ENCODING_ULAW;
else if (ft->info.style == ALAW)
encoding = AUDIO_ENCODING_ALAW;
else
encoding = AUDIO_ENCODING_LINEAR;
audio_if.record.encoding = encoding;
ioctl(fileno(ft->fp), AUDIO_SETINFO, &audio_if);
if (audio_if.record.precision != samplesize) {
fail("Unable to initialize sample size for /dev/audio");
}
if (audio_if.record.channels != ft->info.channels) {
fail("Unable to initialize number of channels for /dev/audio");
}
if (audio_if.record.sample_rate != ft->info.rate) {
fail("Unable to initialize rate for /dev/audio");
}
if (audio_if.record.encoding != encoding) {
fail("Unable to initialize style for /dev/audio");
}
sigint(0); /* Prepare to catch SIGINT */
}
int dspget(ft)
ft_t ft;
{
int rval;
if (abuf_cnt < 1) {
abuf_cnt = read (fileno(ft->fp), (char *)audiobuf, abuf_size);
if (abuf_cnt == 0) {
got_int = 1; /* Act like user said end record */
return(0);
}
}
rval = *(audiobuf + (abuf_size-abuf_cnt));
abuf_cnt--;
return(rval);
}
/* Read short. */
unsigned short dsprshort(ft)
ft_t ft;
{
unsigned short rval;
if (abuf_cnt < 2) {
abuf_cnt = read (fileno(ft->fp), (char *)audiobuf, abuf_size);
if (abuf_cnt == 0) {
got_int = 1; /* act like user said end recording */
return(0);
}
}
rval = *((unsigned short *)(audiobuf + (abuf_size-abuf_cnt)));
abuf_cnt -= 2;
return(rval);
}
/*
* Read up to len samples from file.
* Convert to signed longs.
* Place in buf[].
* Return number of samples read.
*/
LONG sunread(ft, buf, len)
ft_t ft;
LONG *buf, len;
{
register int datum;
int done = 0;
if (got_int)
return(0); /* Return with length 0 read so program will end */
switch(ft->info.size) {
case BYTE:
switch(ft->info.style) {
case SIGN2:
while(done < len) {
datum = dspget(ft);
if (got_int || feof(ft->fp))
return(done);
/* scale signed up to long's range */
*buf++ = LEFT(datum, 24);
done++;
}
return done;
case UNSIGNED:
while(done < len) {
datum = dspget(ft);
if (got_int || feof(ft->fp))
return(done);
/* Convert to unsigned */
datum ^= 128;
/* scale signed up to long's range */
*buf++ = LEFT(datum, 24);
done++;
}
return done;
case ULAW:
/* grab table from Posk stuff */
while(done < len) {
datum = dspget(ft);
if (got_int || feof(ft->fp))
return(done);
datum = st_ulaw_to_linear(datum);
/* scale signed up to long's range */
*buf++ = LEFT(datum, 16);
done++;
}
return done;
case ALAW:
while(done < len) {
datum = dspget(ft);
if (got_int || feof(ft->fp))
return(done);
datum = st_Alaw_to_linear(datum);
/* scale signed up to long's range */
*buf++ = LEFT(datum, 16);
done++;
}
return done;
}
case WORD:
switch(ft->info.style) {
case SIGN2:
while(done < len) {
datum = dsprshort(ft);
if (got_int || feof(ft->fp))
{
fprintf(stderr,"Returning early\n");
return(done);
}
/* scale signed up to long's range */
*buf++ = LEFT(datum, 16);
done++;
}
return done;
case UNSIGNED:
while(done < len) {
datum = dsprshort(ft);
if (got_int || feof(ft->fp))
return(done);
/* Convert to unsigned */
datum ^= 0x8000;
/* scale signed up to long's range */
*buf++ = LEFT(datum, 16);
done++;
}
return done;
case ULAW:
fail("No U-Law support for shorts");
return done;
case ALAW:
fail("No A-Law support");
return done;
}
}
fail("Drop through in sunread!");
/* Return number of samples read */
return(done);
}
/*
* Do anything required when you stop reading samples.
* Don't close input file!
*/
void sunstopread(ft)
ft_t ft;
{
}
void sunstartwrite(ft)
ft_t ft;
{
int samplesize, encoding;
audio_info_t audio_if;
/* Hard code for now. */
abuf_size = 1024;
if ((audiobuf = malloc (abuf_size)) == NULL) {
fail("unable to allocate output buffer of size %d", abuf_size);
}
if (ft->info.rate == 0.0) ft->info.rate = 8000;
if (ft->info.size == -1) ft->info.size = BYTE;
if (ft->info.style == -1) ft->info.style = ULAW;
if (ft->info.size == BYTE) {
samplesize = 8;
if (ft->info.style != ULAW &&
ft->info.style != ALAW &&
ft->info.style != SIGN2) {
report("Sun Audio driver only supports ULAW, ALAW, and Signed Linear for bytes.");
report("Forcing to ULAW");
ft->info.style = ULAW;
}
}
else if (ft->info.size == WORD) {
samplesize = 16;
if (ft->info.style != SIGN2) {
report("Sun Audio driver only supports Signed Linear for words.");
report("Forcing to Signed Linear");
ft->info.style = SIGN2;
}
}
else {
report("Sun Audio driver only supports bytes and words");
ft->info.size = WORD;
samplesize = 16;
}
if (ft->info.channels == -1) ft->info.channels = 1;
else if (ft->info.channels > 1) ft->info.channels = 2;
/* Read in old values, change to what we need and then send back */
if (ioctl(fileno(ft->fp), AUDIO_GETINFO, &audio_if) < 0) {
fail("Unable to initialize /dev/audio");
}
audio_if.play.precision = samplesize;
audio_if.play.channels = ft->info.channels;
audio_if.play.sample_rate = ft->info.rate;
if (ft->info.style == ULAW)
encoding = AUDIO_ENCODING_ULAW;
else if (ft->info.style == ALAW)
encoding = AUDIO_ENCODING_ALAW;
else
encoding = AUDIO_ENCODING_LINEAR;
audio_if.play.encoding = encoding;
ioctl(fileno(ft->fp), AUDIO_SETINFO, &audio_if);
if (audio_if.play.precision != samplesize) {
fail("Unable to initialize sample size for /dev/audio");
}
if (audio_if.play.channels != ft->info.channels) {
fail("Unable to initialize number of channels for /dev/audio");
}
if (audio_if.play.sample_rate != ft->info.rate) {
fail("Unable to initialize rate for /dev/audio");
}
if (audio_if.play.encoding != encoding) {
fail("Unable to initialize style for /dev/audio");
}
}
void dspflush(ft)
ft_t ft;
{
if (write (fileno(ft->fp), audiobuf, abuf_cnt) != abuf_cnt) {
fail("Error writing to sound driver");
}
abuf_cnt = 0;
}
void dspput(ft,c)
ft_t ft;
int c;
{
if (abuf_cnt > abuf_size-1) dspflush(ft);
*(audiobuf + abuf_cnt) = c;
abuf_cnt++;
}
/* Write short. */
void
dspshort(ft,ui)
ft_t ft;
unsigned short ui;
{
if (abuf_cnt > abuf_size-2) dspflush(ft);
*((unsigned short *)(audiobuf + abuf_cnt)) = ui;
abuf_cnt += 2;
}
void sunwrite(ft, buf, len)
ft_t ft;
LONG *buf, len;
{
register int datum;
int done = 0;
switch(ft->info.size) {
case BYTE:
switch(ft->info.style) {
case SIGN2:
while(done < len) {
/* scale signed up to long's range */
datum = RIGHT(*buf++, 24);
dspput(ft,datum);
done++;
}
return;
case UNSIGNED:
while(done < len) {
/* scale signed up to long's range */
datum = RIGHT(*buf++, 24);
/* Convert to unsigned */
datum ^= 128;
dspput(ft,datum);
done++;
}
return;
case ULAW:
while(done < len) {
/* scale signed up to long's range */
datum = (int) RIGHT(*buf++, 16);
/* round up to 12 bits of data */
datum += 0x8; /* + 0b1000 */
datum = st_linear_to_ulaw(datum);
dspput(ft,datum);
done++;
}
return;
case ALAW:
while(done < len) {
/* scale signed up to long's range */
datum = RIGHT(*buf++, 16);
/* round up to 12 bits of data */
datum += 0x8; /* + 0b1000 */
datum = st_linear_to_Alaw(datum);
dspput(ft,datum);
done++;
}
return;
}
case WORD:
switch(ft->info.style) {
case SIGN2:
while(done < len) {
/* scale signed up to long's range */
datum = RIGHT(*buf++, 16);
dspshort(ft,datum);
done++;
}
return;
case UNSIGNED:
while(done < len) {
/* scale signed up to long's range */
datum = RIGHT(*buf++, 16);
/* Convert to unsigned */
datum ^= 0x8000;
dspshort(ft,datum);
done++;
}
return;
case ULAW:
fail("No U-Law support for words");
return;
case ALAW:
fail("No A-Law support for words");
return;
}
}
fail("Drop through in sunwrite!");
}
void sunstopwrite(ft)
ft_t ft;
{
dspflush(ft);
}
#endif