ref: 2c4651293b18eceac8cbb39ed4d3e48667941d52
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"
/*
* 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. */
ft->file.count = 0;
ft->file.pos = 0;
ft->file.eof = 0;
ft->file.size = 1024;
if ((ft->file.buf = malloc (ft->file.size)) == NULL) {
fail("unable to allocate input buffer of size %d", ft->file.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");
}
sigintreg(ft); /* Prepare to catch SIGINT */
}
void sunstartwrite(ft)
ft_t ft;
{
int samplesize, encoding;
audio_info_t audio_if;
/* Hard code for now. */
ft->file.count = 0;
ft->file.pos = 0;
ft->file.eof = 0;
ft->file.size = 1024;
if ((ft->file.buf = malloc (ft->file.size)) == NULL) {
fail("unable to allocate output buffer of size %d", ft->file.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");
}
sigintreg(ft);
}
#endif