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/*
* Audio code using SGI's dmedia library
* - original code by Karl Anders Oygard
* - recording support added by Kimball Thurston 7/22/98
*
* Currently the code is implemented using SGI's old library interface
* ( 5.X and before ). This is still supported under at least 6.3 and 6.4
* It is unknown how long they will continue to support this API...
*/
#include <assert.h>
#include <dmedia/audio.h>
ALport outaudioport = (ALport) 0;
ALport inaudioport = (ALport) 0;
long rate_params[] = { AL_OUTPUT_RATE, 0, AL_INPUT_RATE, 0 };
#define ARCH_esd_audio_open
int esd_audio_open()
{
ALconfig audioconfig;
audioconfig = ALnewconfig();
rate_params[1] = esd_audio_rate;
rate_params[3] = esd_audio_rate;
if (!audioconfig) {
printf( "Couldn't initialize new audio config\n" );
esd_audio_fd = -1;
return esd_audio_fd;
} else {
long pvbuf[] = { AL_OUTPUT_COUNT, 0,
AL_MONITOR_CTL, 0,
AL_OUTPUT_RATE, 0 };
if (ALgetparams(AL_DEFAULT_DEVICE, pvbuf, 6) < 0)
if (oserror() == AL_BAD_DEVICE_ACCESS) {
esd_audio_fd = -1;
return esd_audio_fd;
}
if (pvbuf[1] == 0 && pvbuf[3] == AL_MONITOR_OFF) {
ALsetparams(AL_DEFAULT_DEVICE, rate_params, 2);
} else
if (pvbuf[5] != esd_audio_rate) {
printf("audio device is already in use with wrong sample output rate\n");
esd_audio_fd = -1;
return esd_audio_fd;
}
/* ALsetsampfmt(audioconfig, AL_SAMPFMT_TWOSCOMP); this is the default */
/* ALsetwidth(audioconfig, AL_SAMPLE_16); this is the default */
if ( (esd_audio_format & ESD_MASK_CHAN) == ESD_MONO)
ALsetchannels(audioconfig, AL_MONO);
/* else ALsetchannels(audioconfig, AL_STEREO); this is the default */
ALsetqueuesize(audioconfig, ESD_BUF_SIZE * 2);
outaudioport = ALopenport("esd", "w", audioconfig);
if (outaudioport == (ALport) 0) {
switch (oserror()) {
case AL_BAD_NO_PORTS:
printf( "system is out of ports\n");
esd_audio_fd = -1;
return esd_audio_fd;
break;
case AL_BAD_DEVICE_ACCESS:
printf("couldn't access audio device\n");
esd_audio_fd = -1;
return esd_audio_fd;
break;
case AL_BAD_OUT_OF_MEM:
printf("out of memory\n");
esd_audio_fd = -1;
return esd_audio_fd;
break;
}
/* don't know how we got here, but it must be bad */
esd_audio_fd = -1;
return esd_audio_fd;
}
ALsetfillpoint(outaudioport, ESD_BUF_SIZE);
esd_audio_fd = ALgetfd(outaudioport);
/*
* If we are recording, open a second port to read from
* and return that fd instead
*/
if ( (esd_audio_format & ESD_MASK_FUNC) == ESD_RECORD ) {
inaudioport = ALopenport("esd", "r", audioconfig);
if (inaudioport == (ALport) 0) {
switch (oserror()) {
case AL_BAD_NO_PORTS:
printf( "system is out of ports\n");
esd_audio_fd = -1;
return esd_audio_fd;
break;
case AL_BAD_DEVICE_ACCESS:
printf("couldn't access audio device\n");
esd_audio_fd = -1;
return esd_audio_fd;
break;
case AL_BAD_OUT_OF_MEM:
printf("out of memory\n");
esd_audio_fd = -1;
return esd_audio_fd;
break;
default:
printf( "Unknown error opening port\n" );
}
/* don't know how we got here, but it must be bad */
esd_audio_fd = -1;
return esd_audio_fd;
}
ALsetfillpoint(inaudioport, ESD_BUF_SIZE);
ALsetparams(AL_DEFAULT_DEVICE, (rate_params + 2), 2);
esd_audio_fd = ALgetfd(inaudioport);
}
}
return esd_audio_fd;
}
#define ARCH_esd_audio_close
void esd_audio_close()
{
/*
* I guess this chunk of code is meant to make sure that
* everything that was sent to the output got written
* - let's leave that in for now, but it could cause a
* delay when the user hits stop
* -KDT
*/
if (esd_audio_fd >= 0) {
fd_set write_fds;
FD_ZERO(&write_fds);
FD_SET(esd_audio_fd, &write_fds);
ALsetfillpoint(outaudioport, ESD_BUF_SIZE * 2);
select(esd_audio_fd + 1, NULL, &write_fds, NULL, NULL);
}
if (outaudioport != (ALport) 0) {
ALcloseport(outaudioport);
outaudioport = (ALport) 0;
}
if (inaudioport != (ALport) 0) {
ALcloseport(inaudioport);
inaudioport = (ALport) 0;
}
}
#define ARCH_esd_audio_write
int esd_audio_write(void *buffer, int buf_size)
{
ALsetparams(AL_DEFAULT_DEVICE, rate_params, 2);
if (ALwritesamps(outaudioport, buffer, buf_size / 2) == 0) {
ALsetfillpoint(outaudioport, ESD_BUF_SIZE);
return buf_size;
}
else
return 0;
}
#define ARCH_esd_audio_read
int esd_audio_read(void *buffer, int buf_size)
{
ALsetparams(AL_DEFAULT_DEVICE, (rate_params + 2), 2);
if (ALreadsamps(inaudioport, buffer, buf_size / 2) == 0) {
ALsetfillpoint(inaudioport, ESD_BUF_SIZE);
return buf_size;
}
else
return 0;
}
#define ARCH_esd_audio_flush
void esd_audio_flush()
{
}
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