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/*
* @(#) obuffer_aix.cc 1.1, last edit: 13 Feb 1995 13:13:05
* @(#) Copyright (C) 1993, 1994 Tobias Bading (bading@cs.tu-berlin.de)
* @(#) Berlin University of Technology
*
* AixObuffer class written by
* Nick Cremelie (cremelie@ibmsp.elis.rug.ac.be)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
// statics of class AixObuffer:
int AixObuffer::audio_fd = -1;
int AixObuffer::open_audio_device (void)
{
int fd;
if ((fd = open ("/dev/acpa0/1", O_WRONLY)) < 3)
if ((fd = open ("/dev/paud0/1", O_WRONLY)) < 3)
if ((fd = open ("/dev/baud0/1", O_WRONLY)) < 3)
{
cerr << "Sorry, no audio device is currently available!\n";
exit (1);
}
return ((fd<3)?-1:fd);
}
AixObuffer::AixObuffer (uint32 number_of_channels, Header *header, float volume)
{
struct _track_info
{
unsigned short master_volume;
unsigned short dither_percent;
unsigned short reserved[3];
} t_info;
audio_init a_init;
audio_control a_control;
audio_change a_change;
channels = number_of_channels;
for (int i = 0; i < number_of_channels; ++i)
bufferp[i] = buffer + i;
if (audio_fd < 0)
{
cerr << "Internal error, AixObuffer::audio_fd has to be initialized\n"
"by AixObuffer::class_suitable()!\n";
exit (1);
}
// configure the device:
int play_sample_rate = header->frequency ();
t_info.master_volume=0x7fff;
t_info.dither_percent=0;
a_init.srate=play_sample_rate;
a_init.bits_per_sample=16;
a_init.channels=channels;
a_init.mode=PCM;
a_init.flags=FIXED|BIG_ENDIAN|TWOS_COMPLEMENT;
a_init.operation=PLAY;
a_change.balance=0x3fff0000;
a_change.balance_delay=0;
a_change.volume=(int32)(volume * (float)0x7FFFFFFF);
a_change.volume_delay=0;
a_change.monitor=AUDIO_IGNORE;
a_change.input=AUDIO_IGNORE;
a_change.output=OUTPUT_1;
a_change.dev_info=&t_info;
a_control.ioctl_request=AUDIO_CHANGE;
a_control.position=0;
a_control.request_info=&a_change;
if (ioctl(audio_fd, AUDIO_INIT, &a_init) == -1 )
{
perror ("configuration (init) of audio device failed");
exit (1);
}
if (ioctl(audio_fd, AUDIO_CONTROL, &a_control) == -1 )
{
perror ("configuration (control) of audio device failed");
exit (1);
}
a_control.ioctl_request=AUDIO_START;
a_control.request_info=NULL;
if (ioctl(audio_fd, AUDIO_CONTROL, &a_control) == -1 )
{
perror ("configuration (start) of audio device failed");
exit (1);
}
}
AixObuffer::~AixObuffer (void)
{
if (ioctl(audio_fd, AUDIO_WAIT) == -1)
cerr << "could not wait on audio device!\n";
close (audio_fd);
}
void AixObuffer::append (uint32 channel, int16 value)
{
#ifdef DEBUG
if (channel >= channels)
{
cerr << "illegal channelnumber in AixObuffer::append()!\n";
exit (1);
}
if (bufferp[channel] - buffer >= OBUFFERSIZE)
{
cerr << "buffer overflow!\n";
exit (1);
}
#endif
*bufferp[channel] = value;
bufferp[channel] += channels;
}
void AixObuffer::write_buffer (int)
{
int length = (int)((char *)bufferp[0] - (char *)buffer);
if (write (audio_fd, buffer, length) != length)
{
perror ("write to audio device failed");
exit (1);
}
for (int i = 0; i < channels; ++i)
bufferp[i] = buffer + i;
}
bool AixObuffer::class_suitable (uint32 number_of_channels)
{
// open the audio device:
audio_fd = open_audio_device ();
return True;
}
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