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#ifdef HAVE_MACHINE_SOUNDCARD_H
# include <machine/soundcard.h>
#else
# ifdef HAVE_SOUNDCARD_H
# include <soundcard.h>
# else
# include <sys/soundcard.h>
# endif
#endif
#define ARCH_esd_audio_open
int esd_audio_open()
{
const char *device = "/dev/dsp";
int afd = -1, value = 0, test = 0;
int mode = O_WRONLY;
/* if recording, set for full duplex mode */
if ( (esd_audio_format & ESD_MASK_FUNC) == ESD_RECORD )
mode = O_RDWR;
/* open the sound device */
if ((afd = open(device, mode, 0)) == -1)
{ /* Opening device failed */
perror(device);
return( -1 );
}
/* TODO: check that this is allowable */
/* set for full duplex operation, if recording */
if ( (esd_audio_format & ESD_MASK_FUNC) == ESD_RECORD ) {
ioctl( afd, SNDCTL_DSP_SETDUPLEX, 0 );
}
#if 0
/* set the sound driver fragment size and number */
/* fragment = max_buffers << 16 + log2(buffer_size), (256 16) */
value = test = ( 0x0100 << 16 ) + 0x0008;
if (ioctl(afd, SNDCTL_DSP_SETFRAGMENT, &test) == -1)
{ /* Fatal error */
perror( "SNDCTL_DSP_SETFRAGMENT" );
close( afd );
esd_audio_fd = -1;
return( -1 );
}
if ( 0 /* value != test */ ) /* TODO: determine the real test */
{ /* The device doesn't support the requested audio format. */
fprintf( stderr, "unsupported fragment size: %d\n", value );
close( afd );
esd_audio_fd = -1;
return( -1 );
}
#endif
/* set the sound driver audio format for playback */
value = test = ( (esd_audio_format & ESD_MASK_BITS) == ESD_BITS16 )
? /* 16 bit */ 16 : /* 8 bit */ 8;
if (ioctl(afd, SNDCTL_DSP_SETFMT, &test) == -1)
{ /* Fatal error */
perror("SNDCTL_DSP_SETFMT");
close( afd );
esd_audio_fd = -1;
return( -1 );
}
ioctl(afd, SNDCTL_DSP_GETFMTS, &test);
if ( !(value & test) ) /* TODO: should this be if ( value XOR test ) ??? */
{ /* The device doesn't support the requested audio format. */
fprintf( stderr, "unsupported sound format: %d\n", esd_audio_format );
close( afd );
esd_audio_fd = -1;
return( -1 );
}
/* set the sound driver number of channels for playback */
value = test = ( ( ( esd_audio_format & ESD_MASK_CHAN) == ESD_STEREO )
? /* stereo */ 1 : /* mono */ 0 );
if (ioctl(afd, SNDCTL_DSP_STEREO, &test) == -1)
{ /* Fatal error */
perror( "SNDCTL_DSP_STEREO" );
close( afd );
esd_audio_fd = -1;
return( -1 );
}
/* set the sound driver number playback rate */
test = esd_audio_rate;
if ( ioctl(afd, SNDCTL_DSP_SPEED, &test) == -1)
{ /* Fatal error */
perror("SNDCTL_DSP_SPEED");
close( afd );
esd_audio_fd = -1;
return( -1 );
}
/* see if actual speed is within 5% of requested speed */
if( fabs( test - esd_audio_rate ) > esd_audio_rate * 0.05 )
{
fprintf( stderr, "unsupported playback rate: %d\n", esd_audio_rate );
close( afd );
esd_audio_fd = -1;
return( -1 );
}
/* value = test = buf_size; */
esd_audio_fd = afd;
sleep(1); /* give the driver a chance to wake up, it's kinda finicky that way... */
return afd;
}
#define ARCH_esd_audio_pause
void esd_audio_pause()
{
/* per oss specs */
ioctl( esd_audio_fd, SNDCTL_DSP_POST, 0 );
return;
}
#define ARCH_esd_audio_write
int esd_audio_write( void *buffer, int buf_size ) {
int stereo = ( esd_audio_format & ESD_MASK_CHAN) == ESD_STEREO;
int bits = (esd_audio_format & ESD_MASK_BITS) == ESD_BITS16;
int i;
/* MkLinux uses unsigned bytes for mono 8-bit and signed bytes for stereo 8-bit */
if (stereo && !bits)
for (i = 0; i < buf_size; i++)
((char*)buffer)[i] = ((unsigned char*)buffer)[i] ^ 0x80;
return write( esd_audio_fd, buffer, buf_size );
}
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