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gbs.c
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gbs.c
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/*
* gbsplay is a Gameboy sound player
*
* 2003-2021 (C) by Tobias Diedrich <ranma+gbsplay@tdiedrich.de>
* Christian Garbs <mitch@cgarbs.de>
*
* Licensed under GNU GPL v1 or, at your option, any later version.
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <ctype.h>
#include "common.h"
#include "mapper.h"
#include "gbhw.h"
#include "gbcpu.h"
#include "libgbs.h"
#include "gbs_internal.h"
#include "crc32.h"
#ifdef USE_ZLIB
#include <zlib.h>
#endif
/* Max GB rom size is 4MiB (mapper with 256 banks) */
#define GB_MAX_ROM_SIZE (256 * 0x4000)
#define HDR_LEN_GBS 0x70
#define HDR_LEN_GBR 0x20
#define HDR_LEN_GB 0x150
#define HDR_LEN_GZIP 10
#define HDR_LEN_VGM 0x100
#define GBS_MAGIC "GBS"
#define GBR_MAGIC "GBRF"
#define GD3_MAGIC "Gd3 "
#define VGM_MAGIC "Vgm "
#define GZIP_MAGIC "\037\213\010"
const char *boot_rom_file = ".dmg_rom.bin";
enum filetype {
FILETYPE_GBS = 0,
FILETYPE_GBR = 1,
FILETYPE_GB = 2,
FILETYPE_VGM = 3,
};
struct gbs_subsong_info {
uint32_t len; /* GBS_LEN_DIV (1024) == 1 second */
char *title;
};
struct gbs {
char *buf;
int buf_owned;
uint8_t version;
uint8_t songs;
uint8_t defaultsong;
uint8_t defaultbank;
uint16_t load;
uint16_t init;
uint16_t play;
uint16_t stack;
uint8_t tma;
uint8_t tac;
char *title;
char *author;
char *copyright;
unsigned long codelen;
char *code;
size_t filesize;
uint32_t crc;
uint32_t crcnow;
struct gbs_subsong_info *subsong_info;
char *strings;
char v1strings[33*3];
uint8_t *rom;
unsigned long romsize;
long long ticks;
int16_t lmin, lmax, lvol, rmin, rmax, rvol;
long subsong_timeout, silence_timeout, fadeout, gap;
long long silence_start;
int subsong;
struct gbs_output_buffer *buffer;
gbs_io_cb io_cb;
void *io_cb_priv;
gbs_step_cb step_cb;
void *step_cb_priv;
gbs_sound_cb sound_cb;
void *sound_cb_priv;
gbs_nextsubsong_cb nextsubsong_cb;
void *nextsubsong_cb_priv;
struct gbs_metadata metadata;
struct gbs_channel_status step_cb_channels[4];
struct gbs_status status; // note: this contains a separate gbs_channel_status[] to not interfere with the step callback
struct gbhw_buffer gbhw_buf;
struct gbhw gbhw;
struct mapper *mapper;
enum filetype filetype;
};
const struct gbs_metadata *gbs_get_metadata(struct gbs* const gbs)
{
gbs->metadata.title = gbs->title;
gbs->metadata.author = gbs->author;
gbs->metadata.copyright = gbs->copyright;
return &gbs->metadata;
}
static void update_status_on_subsong_change(struct gbs* const gbs);
void gbs_configure(struct gbs* const gbs, long subsong, long subsong_timeout, long silence_timeout, long subsong_gap, long fadeout)
{
gbs->subsong = subsong;
update_status_on_subsong_change(gbs);
if (silence_timeout) {
if (gbs->filetype == FILETYPE_GB && silence_timeout < 10) {
/* GB ROMs usually have a fairly long silence in the beginning,
enforce a minimum timeout for convenience. */
silence_timeout = 10;
}
}
gbs->subsong_timeout = subsong_timeout;
gbs->silence_timeout = silence_timeout;
gbs->gap = subsong_gap;
gbs->fadeout = fadeout;
}
void gbs_set_loop_mode(struct gbs* const gbs, enum gbs_loop_mode mode)
{
gbs->status.loop_mode = mode;
/* Remaining time clamping may change based on loop_mode */
update_status_on_subsong_change(gbs);
}
void gbs_cycle_loop_mode(struct gbs* const gbs)
{
switch (gbs->status.loop_mode) {
default:
case LOOP_OFF: gbs_set_loop_mode(gbs, LOOP_RANGE); break;
case LOOP_RANGE: gbs_set_loop_mode(gbs, LOOP_SINGLE); break;
case LOOP_SINGLE: gbs_set_loop_mode(gbs, LOOP_OFF); break;
}
}
static int wave_autocorrelate(uint8_t wave[32], int ofs)
{
int i, sum = 0;
for (i=0; i<32; i++) {
sum += (int)wave[i] * (int)wave[(i+ofs) % 32];
}
return sum;
}
static int wave_scalefactor(const struct gbs* const gbs)
{
static const uint8_t offsets[] = {
31, /* offset 1 instead of direct self-correlation, this simplifies the algorithm */
16, /* best correlation offset if pattern repeats two times */
8, /* test for pattern repeating four times */
4, /* eight times */
2, /* sixteen times */
/* thirty-two would be a DC voltage */
};
uint8_t wave[32];
int i, imax = 0, summax = 0;
/* Read waveform ram */
for (i=0; i<16; i++) {
uint8_t b = gbs_io_peek(gbs, 0xff30+i);
wave[2*i] = b >> 4;
wave[2*i+1] = b & 0xf;
}
/* Find best autocorrelation, most likely one of the first two */
for (i=0; i<ARRAY_SIZE(offsets); i++) {
int sum = wave_autocorrelate(wave, offsets[i]);
if (sum > summax) {
imax = i;
summax = sum;
}
}
return imax;
}
/* FIXME: Clean up the api and make public? */
static int gbs_midi_note(const struct gbs* const gbs, long div_tc, int ch)
{
int note = NOTE(div_tc, ch);
if (ch == 2) {
// Scale by scalefactor octaves:
// 0: no repetitions, keep as is
// 1: repeated twice, one octave higher
// 2: repeated four times, two octaves higher
// ...
note += wave_scalefactor(gbs) * 12;
}
return note;
}
void gbs_configure_channels(struct gbs* const gbs, long mute_0, long mute_1, long mute_2, long mute_3) {
gbs->gbhw.ch[0].mute = mute_0;
gbs->gbhw.ch[1].mute = mute_1;
gbs->gbhw.ch[2].mute = mute_2;
gbs->gbhw.ch[3].mute = mute_3;
}
void gbs_configure_output(struct gbs* const gbs, struct gbs_output_buffer *gbs_buf, long rate) {
struct gbhw_buffer *gbhw_buf = &gbs->gbhw_buf;
gbhw_set_rate(&gbs->gbhw, rate);
gbs->buffer = gbs_buf;
gbhw_buf->data = gbs_buf->data;
gbhw_buf->bytes = gbs_buf->bytes;
gbhw_buf->pos = gbs_buf->pos;
gbhw_set_buffer(&gbs->gbhw, gbhw_buf);
}
long gbs_init(struct gbs* const gbs, long subsong)
{
struct gbhw *gbhw = &gbs->gbhw;
struct gbcpu *gbcpu = &gbhw->gbcpu;
gbhw_init(gbhw);
if (gbs->mapper)
mapper_init(gbs->mapper);
if (subsong == -1) subsong = gbs->defaultsong - 1;
if (subsong >= gbs->songs) {
fprintf(stderr, _("Subsong number out of range (min=0, max=%d).\n"), (int)gbs->songs - 1);
return 0;
}
if (gbs->defaultbank != 1) {
gbcpu_mem_put(gbcpu, 0x2000, gbs->defaultbank);
}
gbhw_io_put(gbhw, 0xff06, gbs->tma);
gbhw_io_put(gbhw, 0xff07, gbs->tac);
gbhw_io_put(gbhw, 0xffff, 0x05);
REGS16_W(gbcpu->regs, SP, gbs->stack);
/* put halt breakpoint PC on stack */
gbcpu->halt_at_pc = 0xffff;
REGS16_W(gbcpu->regs, PC, 0xff80);
REGS16_W(gbcpu->regs, HL, gbcpu->halt_at_pc);
gbcpu_mem_put(gbcpu, 0xff80, 0xe5); /* push hl */
gbcpu_step(gbcpu);
/* clear regs/memory touched by stack setup */
REGS16_W(gbcpu->regs, HL, 0x0000);
gbcpu_mem_put(gbcpu, 0xff80, 0x00);
REGS16_W(gbcpu->regs, PC, gbs->init);
gbcpu->regs.rn.a = subsong;
gbs->ticks = 0;
gbs->subsong = subsong;
update_status_on_subsong_change(gbs);
return 1;
}
// FIXME: or just include a *ptr to the whole RAM in struct gbs_status?
uint8_t gbs_io_peek(const struct gbs* const gbs, uint16_t addr) {
return gbhw_io_peek(&gbs->gbhw, addr);
}
static long chvol(const struct gbhw_channel channels[], long ch)
{
long v;
if (channels[ch].mute ||
channels[ch].master == 0 ||
(channels[ch].leftgate == 0 &&
channels[ch].rightgate == 0)) return 0;
if (ch == 2)
v = (3-((channels[2].env_volume+3)&3)) << 2;
else v = channels[ch].env_volume;
return v;
}
static void map_channel_status(const struct gbhw_channel from[], struct gbs_channel_status to[]) {
for (long i = 0; i < 4; i++) {
to[i].mute = from[i].mute;
to[i].vol = chvol(from, i);
to[i].div_tc = from[i].div_tc;
to[i].playing = from[i].running && from[i].master && from[i].env_volume;
}
}
void gbs_set_nextsubsong_cb(struct gbs* const gbs, gbs_nextsubsong_cb cb, void *priv)
{
gbs->nextsubsong_cb = cb;
gbs->nextsubsong_cb_priv = priv;
}
static void wrap_io_callback(cycles_t cycles, uint32_t addr, uint8_t value, void *priv)
{
struct gbs *gbs = priv;
gbs->io_cb(gbs, cycles, addr, value, gbs->io_cb_priv);
}
void gbs_set_io_callback(struct gbs* const gbs, gbs_io_cb fn, void *priv)
{
gbs->io_cb = fn;
gbs->io_cb_priv = priv;
gbhw_set_io_callback(&gbs->gbhw, wrap_io_callback, gbs);
}
static void wrap_step_callback(const cycles_t cycles, const struct gbhw_channel ch[], void *priv)
{
struct gbs* gbs = priv;
map_channel_status(ch, gbs->step_cb_channels);
gbs->step_cb(gbs, cycles, gbs->step_cb_channels, gbs->step_cb_priv);
}
void gbs_set_step_callback(struct gbs* const gbs, gbs_step_cb fn, void *priv)
{
gbs->step_cb = fn;
gbs->step_cb_priv = priv;
gbhw_set_step_callback(&gbs->gbhw, wrap_step_callback, gbs);
}
static void wrap_sound_callback(void *priv)
{
struct gbs* gbs = priv;
gbs->buffer->pos = gbs->gbhw_buf.pos;
gbs->sound_cb(gbs, gbs->buffer, gbs->sound_cb_priv);
}
void gbs_set_sound_callback(struct gbs* const gbs, gbs_sound_cb fn, void *priv)
{
gbs->sound_cb = fn;
gbs->sound_cb_priv = priv;
gbhw_set_callback(&gbs->gbhw, wrap_sound_callback, gbs);
}
long gbs_set_filter(struct gbs* const gbs, enum gbs_filter_type type) {
return gbhw_set_filter(&gbs->gbhw, type);
}
static long gbs_nextsubsong(struct gbs* const gbs)
{
if (gbs->nextsubsong_cb != NULL) {
return gbs->nextsubsong_cb(gbs, gbs->nextsubsong_cb_priv);
} else {
gbs->subsong++;
if (gbs->subsong >= gbs->songs)
return false;
gbs_init(gbs, gbs->subsong);
}
return true;
}
long gbs_step(struct gbs* const gbs, long time_to_work)
{
struct gbhw *gbhw = &gbs->gbhw;
cycles_t cycles = gbhw_step(gbhw, time_to_work);
long time;
if (cycles < 0) {
return false;
}
gbs->ticks += cycles;
gbhw_calc_minmax(gbhw, &gbs->lmin, &gbs->lmax, &gbs->rmin, &gbs->rmax);
gbs->lvol = -gbs->lmin > gbs->lmax ? -gbs->lmin : gbs->lmax;
gbs->rvol = -gbs->rmin > gbs->rmax ? -gbs->rmin : gbs->rmax;
time = gbs->ticks / GBHW_CLOCK;
if (gbs->silence_timeout) {
if (gbs->lmin == gbs->lmax && gbs->rmin == gbs->rmax) {
if (gbs->silence_start == 0)
gbs->silence_start = gbs->ticks;
} else gbs->silence_start = 0;
}
if (gbs->silence_start &&
(gbs->ticks - gbs->silence_start) / GBHW_CLOCK >= gbs->silence_timeout) {
if (gbs->subsong_info[gbs->subsong].len == 0) {
gbs->subsong_info[gbs->subsong].len = gbs->ticks * GBS_LEN_DIV / GBHW_CLOCK;
}
return gbs_nextsubsong(gbs);
}
if (gbs->subsong_timeout && gbs->status.loop_mode != LOOP_SINGLE) {
if (gbs->fadeout &&
time >= gbs->subsong_timeout - gbs->fadeout - gbs->gap)
gbhw_master_fade(gbhw, 128/gbs->fadeout, 0);
if (time >= gbs->subsong_timeout - gbs->gap)
gbhw_master_fade(gbhw, 128*16, 0);
if (time >= gbs->subsong_timeout)
return gbs_nextsubsong(gbs);
}
return true;
}
void gbs_print_info(const struct gbs* const gbs, long verbose)
{
printf(_("GBSVersion: %u\n"
"Title: \"%s\"\n"
"Author: \"%s\"\n"
"Copyright: \"%s\"\n"
"Load address: 0x%04x\n"
"Init address: 0x%04x\n"
"Play address: 0x%04x\n"
"Stack pointer: 0x%04x\n"
"File size: 0x%08x\n"
"ROM size: 0x%08lx (%ld banks)\n"
"Subsongs: %u\n"
"Default subsong: %u\n"),
gbs->version,
gbs->title,
gbs->author,
gbs->copyright,
gbs->load,
gbs->init,
gbs->play,
gbs->stack,
(unsigned int)gbs->filesize,
gbs->romsize,
gbs->romsize/0x4000,
gbs->songs,
gbs->defaultsong);
if (gbs->tac & 0x04) {
printf(_("Timing: %2.2fHz timer%s\n"),
gbhw_calc_timer_hz(gbs->tac, gbs->tma),
(gbs->tac & 0x78) == 0x40 ? _(" + VBlank (ugetab)") : "");
} else {
printf(_("Timing: %s\n"),
_("59.7Hz VBlank\n"));
}
if (gbs->defaultbank != 1) {
printf(_("Bank @0x4000: %d\n"), gbs->defaultbank);
}
printf(_("CRC32: 0x%08lx\n"), (unsigned long)gbs->crcnow);
}
static void update_status_on_subsong_change(struct gbs* const gbs) {
struct gbs_status *status = &gbs->status;
status->songtitle = gbs->subsong_info[gbs->subsong].title;
if (!status->songtitle) {
status->songtitle = _("Untitled");
}
status->subsong = gbs->subsong;
status->subsong_len = gbs->subsong_info[gbs->subsong].len;
if (status->subsong_len == 0 && gbs->status.loop_mode != LOOP_SINGLE) {
status->subsong_len = gbs->subsong_timeout * 1024;
}
}
const struct gbs_status* gbs_get_status(struct gbs* const gbs) {
struct gbs_status *status = &gbs->status;
const struct gbhw *gbhw = &gbs->gbhw;
status->rvol = gbs->rvol;
status->lvol = gbs->lvol;
status->ticks = gbs->ticks;
map_channel_status(gbhw->ch, status->ch);
return status;
}
long gbs_toggle_mute(struct gbs* const gbs, long channel) {
return gbs->gbhw.ch[channel].mute ^= 1;
}
static void gbs_free(struct gbs* const gbs)
{
gbhw_cleanup(&gbs->gbhw);
if (gbs->mapper)
mapper_free(gbs->mapper);
if (gbs->buf && gbs->buf_owned)
free(gbs->buf);
if (gbs->rom)
free(gbs->rom);
if (gbs->subsong_info)
free(gbs->subsong_info);
free(gbs);
}
void gbs_close(struct gbs* const gbs)
{
gbs_free(gbs);
}
static uint32_t readint(const char* const buf, long bytes)
{
long i;
long shift = 0;
uint32_t res = 0;
for (i=0; i<bytes; i++) {
res |= (unsigned char)buf[i] << shift;
shift += 8;
}
return res;
}
long gbs_write(const struct gbs* const gbs, const char* const name)
{
long fd;
char pad[16];
long newlen = gbs->filesize;
long namelen = strlen(name);
char *tmpname = malloc(namelen + sizeof(".tmp\0"));
memcpy(tmpname, name, namelen);
sprintf(&tmpname[namelen], ".tmp");
memset(pad, 0xff, sizeof(pad));
if ((fd = open(tmpname, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) {
fprintf(stderr, _("Could not open %s: %s\n"), name, strerror(errno));
return 0;
}
if (write(fd, gbs->buf, newlen) == newlen) {
int ret = 1;
close(fd);
if (rename(tmpname, name) == -1) {
fprintf(stderr, _("Could not rename %s to %s: %s\n"), tmpname, name, strerror(errno));
ret = 0;
}
return ret;
}
close(fd);
return 1;
}
void gbs_write_rom(const struct gbs* const gbs, FILE *out, const uint8_t* const logo_data)
{
if (gbs->rom[0x104] != 0xce) {
unsigned long tmp = gbs->romsize;
int i;
uint8_t rom_size = 0;
uint8_t chksum = 0x19;
while (tmp > 32768) {
rom_size++;
tmp >>= 1;
}
if (rom_size > 8) {
fputs(_("ROM size above limit (8 MiB)!"), stderr);
}
memcpy(&gbs->rom[0x104], logo_data, 0x30);
snprintf((char*)&gbs->rom[0x134], 16, "%s", gbs->title);
gbs->rom[0x147] = 0x02; /* MBC1+RAM */
gbs->rom[0x148] = rom_size;
gbs->rom[0x149] = 0x02; /* 8KiB of RAM */
for (i = 0x134; i < 0x14c; i++) {
chksum += gbs->rom[i];
}
gbs->rom[0x14d] = -chksum;
}
fwrite(gbs->rom, 1, gbs->romsize, out);
}
static struct gbs* gbs_new(char *buf)
{
struct gbs* gbs = calloc(sizeof(struct gbs), 1);
gbhw_init_struct(&gbs->gbhw);
gbs->silence_timeout = 2*60;
gbs->subsong_timeout = 2*60;
gbs->gap = 2;
gbs->fadeout = 3;
gbs->songs = 1;
gbs->defaultsong = 1;
gbs->defaultbank = 1;
gbs->init = 0x100;
gbs->play = 0x100;
gbs->stack = 0xfffe;
gbs->buf = buf;
return gbs;
}
const uint8_t *gbs_get_bootrom()
{
static uint8_t bootrom[256];
char *bootname = NULL;
size_t name_len;
FILE *romf;
name_len = strlen(getenv("HOME")) + strlen(boot_rom_file) + 2;
bootname = malloc(name_len);
snprintf(bootname, name_len, "%s/%s", getenv("HOME"), boot_rom_file);
romf = fopen(bootname, "rb");
free(bootname);
if (!romf) {
return NULL;
}
if (fread(bootrom, 1, sizeof(bootrom), romf) != sizeof(bootrom)) {
fclose(romf);
return NULL;
}
fclose(romf);
return bootrom;
}
static struct gbs *gb_open(const char* const name, char *buf, size_t size)
{
long i;
struct gbs* gbs = gbs_new(buf);
char *na_str = _("gb / not available");
const uint8_t *bootrom = gbs_get_bootrom();
UNUSED(name);
/* Test if this looks like a valid rom header title */
for (i=0x0134; i<0x0143; i++) {
if (!(isalnum(buf[i]) || isspace(buf[i])))
break;
}
if (buf[i] == 0) {
/* Title looks valid and is zero-terminated. */
gbs->title = &buf[0x0134];
} else {
gbs->title = na_str;
}
gbs->filetype = FILETYPE_GB;
gbs->author = na_str;
gbs->copyright = na_str;
gbs->code = buf;
gbs->filesize = size;
gbs->subsong_info = calloc(sizeof(struct gbs_subsong_info), gbs->songs);
gbs->codelen = size - 0x20;
gbs->crcnow = gbs_crc32(0, buf, gbs->filesize);
gbs->romsize = (gbs->codelen + 0x3fff) & ~0x3fff;
gbs->rom = calloc(1, gbs->romsize);
memcpy(gbs->rom, buf, gbs->codelen);
gbs->mapper = mapper_gb(&gbs->gbhw.gbcpu, gbs->rom, gbs->romsize, buf[0x147], buf[0x148], buf[0x149]);
if (!gbs->mapper) {
fprintf(stderr, _("Unsupported cartridge type: 0x%02x\n"), buf[0x147]);
gbs_free(gbs);
return NULL;
}
/* For accuracy testing purposes, support boot rom. */
if (bootrom != NULL) {
gbhw_enable_bootrom(&gbs->gbhw, bootrom);
gbs->init = 0;
}
gbs->buf_owned = 1;
return gbs;
}
static struct gbs *gbr_open(const char* const name, char *buf, size_t size)
{
long i;
struct gbs* gbs = gbs_new(buf);
char *na_str = _("gbr / not available");
uint16_t vsync_addr;
uint16_t timer_addr;
if (strncmp(buf, GBR_MAGIC, 4) != 0) {
fprintf(stderr, _("Not a GBR-File: %s\n"), name);
gbs_free(gbs);
return NULL;
}
if (buf[0x07] < 1 || buf[0x07] > 3) {
fprintf(stderr, _("Unsupported timerflag value: %d\n"), buf[0x07]);
gbs_free(gbs);
return NULL;
}
gbs->filetype = FILETYPE_GBR;
gbs->songs = 255;
gbs->defaultbank = buf[0x06];
gbs->init = readint(&buf[0x08], 2);
vsync_addr = readint(&buf[0x0a], 2);
timer_addr = readint(&buf[0x0c], 2);
if (buf[0x07] == 1) {
gbs->play = vsync_addr;
} else {
gbs->play = timer_addr;
}
gbs->tma = buf[0x0e];
gbs->tac = buf[0x0f];
/* Test if this looks like a valid rom header title */
for (i=0x0154; i<0x0163; i++) {
if (!(isalnum(buf[i]) || isspace(buf[i])))
break;
}
if (buf[i] == 0) {
/* Title looks valid and is zero-terminated. */
gbs->title = &buf[0x0154];
} else {
gbs->title = na_str;
}
gbs->author = na_str;
gbs->copyright = na_str;
gbs->code = &buf[0x20];
gbs->filesize = size;
gbs->subsong_info = calloc(sizeof(struct gbs_subsong_info), gbs->songs);
gbs->codelen = size - 0x20;
gbs->crcnow = gbs_crc32(0, buf, gbs->filesize);
gbs->romsize = (gbs->codelen + 0x3fff) & ~0x3fff;
gbs->rom = calloc(1, gbs->romsize);
memcpy(gbs->rom, &buf[0x20], gbs->codelen);
gbs->mapper = mapper_gbr(&gbs->gbhw.gbcpu, gbs->rom, gbs->romsize, buf[5], buf[6]);
gbs->rom[0x40] = 0xd9; /* reti */
gbs->rom[0x50] = 0xd9; /* reti */
if (buf[0x07] & 1) {
/* V-Blank */
gbs->rom[0x40] = 0xcd; /* call imm16 */
gbs->rom[0x41] = vsync_addr & 0xff;
gbs->rom[0x42] = vsync_addr >> 8;
gbs->rom[0x43] = 0xd9; /* reti */
}
if (buf[0x07] & 2) {
/* Timer */
gbs->rom[0x50] = 0xcd; /* call imm16 */
gbs->rom[0x51] = timer_addr & 0xff;
gbs->rom[0x52] = timer_addr >> 8;
gbs->rom[0x53] = 0xd9; /* reti */
}
gbs->buf_owned = 1;
return gbs;
}
static uint32_t le32(const char* const buf)
{
const uint8_t *b = (const uint8_t*)buf;
return b[0] | (b[1] << 8) | (b[2] << 16) | (b[3] << 24);
}
static uint16_t le16(const char* const buf)
{
const uint8_t *b = (const uint8_t*)buf;
return b[0] | (b[1] << 8);
}
static void emit(struct gbs* const gbs, long* const code_used, uint8_t data, long reserve)
{
long remain = gbs->codelen - *code_used;
uint8_t *code = (uint8_t*) &gbs->code[*code_used];
if (reserve + 1 > remain) {
while (remain-- > 0) {
*(code++) = 0xc9; /* RET */
(*code_used)++;
}
gbs->code = realloc(gbs->code, gbs->codelen + 0x4000);
gbs->codelen += 0x4000;
code = (uint8_t*) &gbs->code[*code_used];
}
*(code++) = data;
(*code_used)++;
}
static void gd3_parse(struct gbs **gbs, const char* const gd3, long gd3_len)
{
char *buf;
char *s;
long ofs = 12;
long idx = 0;
if (gd3_len < 12 || gd3_len > 4096) {
return;
}
if (strncmp(gd3, GD3_MAGIC, 4) != 0) {
return;
}
if (le32(&gd3[4]) != 0x00000100) {
return;
}
if (le32(&gd3[8]) != gd3_len - ofs) {
return;
}
*gbs = realloc(*gbs, sizeof(struct gbs) + gd3_len);
s = buf = (char *)&(*gbs)[1];
while (ofs < gd3_len) {
uint16_t val = le16(&gd3[ofs]);
if (val == 0) {
*(buf++) = 0;
switch (idx) {
case 0: (*gbs)->subsong_info[0].title = s; break;
case 2: (*gbs)->title = s; break;
case 6: (*gbs)->author = s; break;
default: break;
}
s = buf;
idx++;
} else if (val < 256) {
*(buf++) = val;
} else {
*(buf++) = '?';
}
ofs += 2;
}
}
static struct gbs *vgm_open(const char* const name, char* const buf, size_t size)
{
struct gbs* gbs = gbs_new(buf);
char *na_str = _("vgm / not available");
char *gd3 = NULL;
char *data;
long dmg_clock;
uint32_t eof_ofs;
long gd3_ofs;
long gd3_len;
long data_ofs;
long data_len;
long vgm_parsed = false;
long total_wait;
long total_clocks;
long code_used;
long addr;
long jpaddr;
if (strncmp(buf, VGM_MAGIC, 4) != 0) {
fprintf(stderr, _("Not a VGM-File: %s\n"), name);
gbs_free(gbs);
return NULL;
}
if (buf[0x09] != 1 || buf[0x08] < 0x61) {
fprintf(stderr, _("Unsupported VGM version: %d.%02x\n"), buf[0x09], buf[0x08]);
gbs_free(gbs);
return NULL;
}
dmg_clock = le32(&buf[0x80]);
if (dmg_clock != 4194304) {
fprintf(stderr, _("Unsupported DMG clock: %ldHz\n"), dmg_clock);
gbs_free(gbs);
return NULL;
}
eof_ofs = le32(&buf[0x4]) + 0x4;
if (eof_ofs > size) {
fprintf(stderr, _("Bad file size in header: %ld\n"), eof_ofs);
gbs_free(gbs);
return NULL;
}
gd3_ofs = le32(&buf[0x14]) + 0x14;
if (gd3_ofs == 0x14) {
gd3_ofs = eof_ofs;
gd3_len = 0;
} else {
gd3_len = eof_ofs - gd3_ofs;
gd3 = &buf[gd3_ofs];
if (gd3_len < 4 || strncmp(gd3, GD3_MAGIC, 4) != 0) {
fprintf(stderr, _("Bad GD3 offset: %08lx\n"), gd3_ofs);
gbs_free(gbs);
return NULL;
}
}
data_ofs = le32(&buf[0x34]) + 0x34;
data_len = gd3_ofs - data_ofs;
data = &buf[data_ofs];
if (data_len < 0) {
fprintf(stderr, _("Bad data length: %ld\n"), data_len);
gbs_free(gbs);
return NULL;
}
gbs->filetype = FILETYPE_VGM;
gbs->codelen = 0x4000;
gbs->code = calloc(1, gbs->codelen);
code_used = 0;
total_wait = total_clocks = 0;
while (!vgm_parsed) {
switch ((uint8_t)*data) {
default:
fprintf(stderr, _("Unsupported VGM opcode: 0x%02x\n"), *data);
gbs_free(gbs);
return NULL;
case 0x61: /* Wait n samples */
total_wait += le16(&data[1]);
data += 2;
break;
case 0x62: /* Wait 735 (1/60s) */
total_wait += 735;
break;
case 0x63: /* Wait 882 (1/50s) */
total_wait += 882;
break;
case 0x66: /* End of sound data */
vgm_parsed = true;
break;
case 0x70:
case 0x71:
case 0x72:
case 0x73:
case 0x74:
case 0x75:
case 0x76:
case 0x77:
case 0x78:
case 0x79:
case 0x7a:
case 0x7b:
case 0x7c:
case 0x7d:
case 0x7e:
case 0x7f:
/* Wait n+1 samples */
total_wait += (*data & 0xf) + 1;
break;
case 0xb3: /* DMG write */
{
long delay = (total_wait * 41943L / 441L) - total_clocks;
long units = (delay + 31) / 64;
uint8_t reg = 0x10 + ((uint8_t)data[1] & 0x7f);
uint8_t val = (uint8_t)data[2];
while (units > 0) {
long d = units > 0x10000 ? 0x10000 : units;
emit(gbs, &code_used, 0xcf, 3); // RST 0x08
emit(gbs, &code_used, (d - 1) & 0xff, 0);
emit(gbs, &code_used, (d - 1) >> 8, 0);
units -= d;
total_clocks += d * 64;
}
/* LD a, imm8 */
emit(gbs, &code_used, 0x3e, 4);
emit(gbs, &code_used, val, 0);
/* LDH (a8), A */
emit(gbs, &code_used, 0xe0, 0);
emit(gbs, &code_used, reg, 0);
}
data += 2;
break;
}
data++;
}
/* RST 0x38 */
emit(gbs, &code_used, 0xff, 1);
gbs->load = 0x0400;
gbs->init = 0x0440;
gbs->play = 0x0404;
gbs->tma = 0;
gbs->tac = 0;
gbs->title = na_str;
gbs->author = na_str;
gbs->copyright = na_str;
gbs->filesize = size;
gbs->crcnow = gbs_crc32(0, buf, gbs->filesize);
gbs->subsong_info = calloc(sizeof(struct gbs_subsong_info), gbs->songs);
gbs->subsong_info[0].len = total_clocks / (GBHW_CLOCK / GBS_LEN_DIV);
if (gd3_len > 0) {
gd3_parse(&gbs, gd3, gd3_len);
}
gbs->romsize = gbs->codelen + 0x4000;
gbs->rom = calloc(1, gbs->romsize);
memcpy(&gbs->rom[0x4000], gbs->code, gbs->codelen);
gbs->mapper = mapper_gbs(&gbs->gbhw.gbcpu, gbs->rom, gbs->romsize);
/* 16 + 52 for RST + setup */
addr = 0x8;
gbs->rom[addr++] = 0xe1; /* 12: pop hl */
gbs->rom[addr++] = 0x2a; /* 8: ld a, (hl+) */
gbs->rom[addr++] = 0x5f; /* 4: ld e, a */
gbs->rom[addr++] = 0x2a; /* 8: ld a, (hl+) */
gbs->rom[addr++] = 0x57; /* 4: ld d, a */