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#include <SDL.h>
#include <stdio.h>
#include <stdlib.h>
#include "pokey.h"
#define ROM_FILE "../jumpmanjr.rom"
#define ROM_SIZE 0x4000
#define FREQ 44100
#define PAL_BUF_SIZE 882
#define NTSC_BUF_SIZE 735
#define PAL_DELAY 20
#define NTSC_DELAY 17
unsigned char sndbuf[PAL_BUF_SIZE + 1];
int buf_size = NTSC_BUF_SIZE;
int delay = NTSC_DELAY;
unsigned char rom[ROM_SIZE];
void usage(void) {
fprintf(stderr, "usage: playsnd [-p] 0xaddr\n");
exit(1);
}
void load_rom(void) {
int size;
FILE *f;
f = fopen(ROM_FILE, "rb");
if(!f) {
perror(ROM_FILE);
usage();
}
size = fread(rom, 1, ROM_SIZE, f);
if(size != ROM_SIZE) {
fprintf(stderr, "file %s should be %d bytes long, not %d\n",
ROM_FILE, ROM_SIZE, size);
usage();
}
fprintf(stderr, "loaded ROM %s, %d bytes\n", ROM_FILE, size);
}
void play_frames(unsigned char count) {
fprintf(stderr, "playing for %d frames\n", count);
while(count--) {
SDL_Delay(delay);
}
}
void play_sfx(int addr) {
unsigned char *p = rom + (addr - 0x8000);
while(1) {
fprintf(stderr, "$%04lx: $%02x\n", (p - rom + 0x8000), *p);
switch(*p) {
case 0:
fprintf(stderr, "opcode 0 (snd_end)\n");
return;
case 1:
fprintf(stderr, "opcode 1 (snd_audc)\n");
Update_pokey_sound(audc1, *++p);
play_frames(*++p);
++p;
break;
case 2:
fprintf(stderr, "opcode 2 (snd_jump)\n");
addr = *++p;
addr |= ( (*++p) << 8);
addr -= 0x8000;
p = rom + addr;
break;
case 3:
fprintf(stderr, "opcode 3 (snd_rest)\n");
Update_pokey_sound(audc1, 0);
play_frames(*++p);
++p;
break;
default:
fprintf(stderr, "opcode $%02x (snd_note)\n", *p);
Update_pokey_sound(audf1, *p);
play_frames(*++p);
++p;
break;
}
}
}
void sdl_audio_callback(void *userdata, Uint8* stream, int len) {
Pokey_process(stream, len);
}
void init_sdl_audio(void) {
SDL_AudioSpec want, have;
SDL_AudioDeviceID dev;
if(SDL_Init(SDL_INIT_AUDIO) < 0) {
fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
exit(-1);
}
atexit(SDL_Quit);
SDL_memset(&want, 0, sizeof(want));
want.freq = FREQ;
want.format = AUDIO_U8;
want.channels = 1;
want.samples = buf_size;
want.callback = sdl_audio_callback;
dev = SDL_OpenAudioDevice(0, 0, &want, &have, 0);
if(!dev) {
fprintf(stderr, "Failed to open audio: %s\n", SDL_GetError());
exit(-1);
}
SDL_PauseAudioDevice(dev, 0);
}
int main(int argc, char **argv) {
int addr;
if(argc < 2 || argc > 3) usage();
if(argc == 3) {
buf_size = PAL_BUF_SIZE;
delay = PAL_DELAY;
addr = (int)strtol(argv[2], 0, 16);
} else {
addr = (int)strtol(argv[1], 0, 16);
}
if(addr < 0x8000 || addr > 0xbfff) {
fprintf(stderr, "invalid address, must be 0x8fff thru 0xbfff\n");
usage();
}
load_rom();
fprintf(stderr, "playing sfx at $%04x, buf_size %d\n", addr, buf_size);
Pokey_sound_init(FREQ_17_APPROX, FREQ);
init_sdl_audio();
play_sfx(addr);
return(0);
}
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