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#include "config.h"
#include <fcntl.h>
#include "atari.h"
#include "pokeysnd.h"
#include "allegro.h"
extern int timesync;
static char *rcsid = "$Id: sound.c,v 1.2 1997/04/18 22:23:38 david Exp $";
int speed_count = 0;
#define FALSE 0
#define TRUE 1
static sound_enabled = TRUE;
static int gain = 4;
static int AUDCTL = 0x00;
static int AUDF[4] =
{0, 0, 0, 0};
static int AUDC[4] =
{0, 0, 0, 0};
static int sample_pos;
static unsigned char *buffer;
static int frames_per_second = 60;
static int real_updates_per_frame = 262;
static int stream_len;
static int stream_freq;
AUDIOSTREAM *stream;
void init_stream(){
stream = play_audio_stream(stream_len, 8, stream_freq , 255, 128);//255=vol 128=pan 8=bits
if (!stream) {
printf("Error creating audio stream!\n");
abort();
}
}
static int updatecount;
void pokey_update(void)
{
int newpos;
if (sound_enabled == 0)
return;
if (updatecount >= real_updates_per_frame)
return;
newpos = stream_len * (updatecount) / real_updates_per_frame;
if (newpos > stream_len)
newpos = stream_len;
Pokey_process(buffer + sample_pos, newpos - sample_pos);
sample_pos = newpos;
updatecount++;
}
int dossound_Initialise(int *argc, char *argv[])
{
int i, j;
if (tv_mode == TV_PAL) {
frames_per_second = 50;
real_updates_per_frame = 312;
}
for (i = j = 1; i < *argc; i++) {
if (stricmp(argv[i], "-sound") == 0)
sound_enabled = TRUE;
else if (strcmp(argv[i], "-nosound") == 0)
sound_enabled = FALSE;
else
argv[j++] = argv[i];
}
*argc = j;
if (sound_enabled) {
if (install_sound(DIGI_AUTODETECT, MIDI_NONE, NULL) != 0) {
printf("Error initialising sound system\n%s\n", allegro_error);
return 1;
}
}
if (sound_enabled) {
timesync = FALSE;
stream_len = (44100 - 1) / frames_per_second;
stream_freq = stream_len * frames_per_second;
sample_pos = 0;
if ((buffer = (char *) malloc(stream_len)) == 0) {
free(buffer);
return 1;
}
memset(buffer, 0x00, stream_len);
Pokey_sound_init(FREQ_17_EXACT, stream_freq, 1);
init_stream();
}
else {
timesync = TRUE;
}
return 0;
}
void dossound_Exit(void)
{
}
void dossound_UpdateSound(void)
{
if (sound_enabled) {
unsigned char *p;
updatecount = 0;
if (sample_pos < stream_len)
Pokey_process(buffer + sample_pos, stream_len - sample_pos);
sample_pos = 0;
while (!(p=get_audio_stream_buffer(stream))){}
memcpy(p, buffer, stream_len);
free_audio_stream_buffer(stream);
}
}
void Atari_AUDC(int channel, int byte)
{
channel--;
Update_pokey_sound( 1 + channel + channel, byte, 0, gain);
}
void Atari_AUDF(int channel, int byte)
{
channel--;
Update_pokey_sound( channel + channel, byte, 0, gain);
}
void Atari_AUDCTL(int byte)
{
Update_pokey_sound( 8, byte, 0, gain);
}
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