void exit_sound_system()
{
WORD ltatten, rtatten, ltgain, rtgain;
/* Save old settings */
ltatten = soundcmd(LTATTEN, -1);
rtatten = soundcmd(RTATTEN, -1);
ltgain = soundcmd(LTGAIN, -1);
rtgain = soundcmd(RTGAIN, -1);
/* Reset sound system */
sndstatus(1);
/* Restore old settings */
soundcmd(LTATTEN, ltatten);
soundcmd(RTATTEN, rtatten);
soundcmd(LTGAIN, ltgain);
soundcmd(RTGAIN, rtgain);
/* Set some necessary parameters */
settracks(0,0);
setmontracks(0);
setmode(STEREO16);
soundcmd(ADDERIN, 0x2);
soundcmd(ADCINPUT, 0x0);
devconnect(ADC, DAC, CLK25M, CLK50K, 1);
/* Unlock Sound System */
unlocksnd();
}
void init_sound_system()
{
char lod_buf[30000];
WORD ltatten, rtatten, ltgain, rtgain;
/* Lock Sound System */
locksnd();
/* Save old settings */
ltatten = soundcmd(LTATTEN, -1);
rtatten = soundcmd(RTATTEN, -1);
ltgain = soundcmd(LTGAIN, -1);
rtgain = soundcmd(RTGAIN, -1);
/* Reset sound system */
sndstatus(1);
/* Restore old settings */
soundcmd(LTATTEN, ltatten);
soundcmd(RTATTEN, rtatten);
soundcmd(LTGAIN, ltgain);
soundcmd(RTGAIN, rtgain);
/* Set some necessary parameters */
settracks(0,0);
setmontracks(0);
setmode(STEREO16);
setbuffer(0,sound,sound+sizeof(sound));
soundcmd(ADDERIN, 0x2);
soundcmd(ADCINPUT, 0x0);
/* DSP side */
dsptristate(ENABLE, ENABLE);
dsp_abil = Dsp_RequestUniqueAbility();
/* Dsp_LoadProg(DSP_LOD, dsp_abil, lod_buf); */
Dsp_ExecProg(dsp_bin, sizeof(dsp_bin)/3, dsp_abil);
/* Connect DMA playback with DSP and then to DAC */
switch (options.function) {
case replay:
devconnect(DMAPLAY, DSPRECV, CLK25M, options.prescale, NO_SHAKE);
devconnect(DSPXMIT, DAC, CLK25M, options.prescale, NO_SHAKE);
break;
case record:
break;
case thru:
devconnect(ADC, DSPRECV, CLK25M, options.prescale, NO_SHAKE);
devconnect(DSPXMIT, DAC, CLK25M, options.prescale, NO_SHAKE);
break;
}
Dsp_BlkUnpacked(&options.dsp.mono, 1L, 0L, 0L);
Dsp_BlkUnpacked(&options.dsp.karaoke, 1L, 0L, 0L);
Dsp_BlkUnpacked(&options.dsp.flange, 1L, 0L, 0L);
}
static
int queue(struct buffer *buffer)
{
init_header(&buffer->header, buffer->pcm_data, buffer->pcm_nsamples,
config_channels, config_speed, config_precision);
if (soundcmd(QUEUE, bufferCmd, 0, (long) &buffer->header) == -1 ||
soundcmd(QUEUE, callBackCmd, 0, (long) buffer) == -1)
return -1;
return 0;
}
static void falcon_dmasound_init(void)
{
/*
* connect DMA playback to DAC (headphone/speaker)
* set clock = internal 25.175MHz
* set TT/STe compatibility mode
* disable handshaking
*/
devconnect(0,8,0,0,1);
setsndmode(0); /* set 8-bit stereo */
soundcmd(2,0x0080); /* set left gain = 8 */
soundcmd(3,0x0080); /* set right gain = 8 */
soundcmd(4,0x0003); /* set ADDER input to ADC & connection matrix */
soundcmd(5,0x0003); /* set L & R channel ADC source to PSG */
soundcmd(6,0x0003); /* set TT-compatible prescale to /160 = 50MHz */
}
static
int set_pause(int flag)
{
static int paused;
if (flag != paused) {
paused = 0;
if (flag) {
if (soundcmd(IMMEDIATE, pauseCmd, 0, 0) == -1 ||
soundcmd(IMMEDIATE, quietCmd, 0, 0) == -1)
return -1;
}
else if (soundcmd(IMMEDIATE, resumeCmd, 0, 0) == -1)
return -1;
paused = flag;
}
return 0;
}
static
int flush(void)
{
int i, result = 0;
if (soundcmd(IMMEDIATE, flushCmd, 0, 0) == -1)
result = -1;
for (i = 0; i < NBUFFERS; ++i)
MPSignalSemaphore(output[i].semaphore);
output[bindex].pcm_nsamples = 0;
return result;
}
static
int config(struct audio_config *config)
{
unsigned int bitdepth;
if (set_pause(0) == -1)
return -1;
bitdepth = config->precision & ~7;
if (bitdepth == 0 || bitdepth > 16)
bitdepth = 16;
if (drain() == -1 ||
soundcmd(QUEUE, reInitCmd, 0, initNoDrop |
(config->channels == 1 ? initMono : initStereo)) == -1)
return -1;
switch (config->precision = bitdepth) {
case 8:
audio_pcm = audio_pcm_u8;
break;
case 16:
# if defined(WORDS_BIGENDIAN)
audio_pcm = audio_pcm_s16be;
# else
audio_pcm = audio_pcm_s16le;
# endif
break;
}
config_channels = config->channels;
config_speed = config->speed;
config_precision = config->precision;
return 0;
}
void mute(int mode)
{
static int ltatten, rtatten, ltgain, rtgain;
if (mode) { /* mode==MUTE */
/* Save old settings */
ltatten = (int) soundcmd(LTATTEN, -1);
rtatten = (int) soundcmd(RTATTEN, -1);
ltgain = (int) soundcmd(LTGAIN, -1);
rtgain = (int) soundcmd(RTGAIN, -1);
soundcmd(LTATTEN, 0x00f0);
soundcmd(RTATTEN, 0x00f0);
soundcmd(RTGAIN, 0x0000);
soundcmd(LTGAIN, 0x0000);
} else { /* mode==MUTE_RESTORE */
/* Restore old settings */
soundcmd(LTATTEN, ltatten);
soundcmd(RTATTEN, rtatten);
soundcmd(LTGAIN, ltgain);
soundcmd(RTGAIN, rtgain);
}
}