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vgm_logger.c
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vgm_logger.c
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#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdint.h>
#include "vgm_logger.h"
// This is a hardcoded header just for X68000 logs, with YM2151 at 4MHz and M6258 at 8MHz
// which makes this class non-reusable outside of this project, which is fine
uint8_t vgm_header[] = {
0x56,0x67,0x6d,0x20, 0x00,0x00,0x00,0x00, 0x61,0x01,0x00,0x00, 0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,
0x00,0x09,0x3d,0x00, 0x8c,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,
0x00,0x12,0x7a,0x00, 0x06,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,
};
int vgm_logger_init(struct vgm_logger *log, const char *filename) {
log->total_samples = 0;
log->total_bytes = 0;
log->wait_cummulative = 0;
log->f = fopen(filename, "wb");
if(!log->f) {
fprintf(stderr, "Could not open %s for writing: %s (%d)\n", filename, strerror(errno), errno);
return -1;
}
fwrite(vgm_header, 1, sizeof(vgm_header), log->f);
return 0;
}
int vgm_logger_write_wait(struct vgm_logger *log, int wait) {
log->wait_cummulative += wait;
return log->wait_cummulative;
}
static void vgm_logger_write_wait_cmd(struct vgm_logger *log) {
if(log->wait_cummulative == 0) return;
log->total_samples += log->wait_cummulative;
uint8_t buf[4];
while(log->wait_cummulative > 65535) {
buf[0] = 0x61;
buf[1] = 0xff;
buf[2] = 0xff;
log->total_bytes += fwrite(buf, 1, 3, log->f);
log->wait_cummulative -= 65535;
}
if(log->wait_cummulative == 0) return;
if(log->wait_cummulative == 735) {
buf[0] = 0x62;
log->total_bytes += fwrite(buf, 1, 1, log->f);
} else if(log->wait_cummulative == 882) {
buf[0] = 0x63;
log->total_bytes += fwrite(buf, 1, 1, log->f);
} else if(log->wait_cummulative <= 16) {
buf[0] = 0x70 + log->wait_cummulative - 1;
log->total_bytes += fwrite(buf, 1, 1, log->f);
} else {
buf[0] = 0x61;
buf[1] = log->wait_cummulative & 0xff;
buf[2] = log->wait_cummulative >> 8;
log->total_bytes += fwrite(buf, 1, 3, log->f);
}
log->wait_cummulative = 0;
}
int vgm_logger_write_ym2151(struct vgm_logger *log, uint8_t reg, uint8_t val) {
vgm_logger_write_wait_cmd(log);
uint8_t buf[3] = { 0x54, reg, val };
return log->total_bytes += fwrite(buf, 1, sizeof(buf), log->f);
}
int vgm_logger_write_okim6258(struct vgm_logger *log, uint8_t port, uint8_t val) {
vgm_logger_write_wait_cmd(log);
uint8_t buf[3] = { 0xb7, port, val };
return log->total_bytes += fwrite(buf, 1, sizeof(buf), log->f);
}
int vgm_logger_end(struct vgm_logger *log) {
vgm_logger_write_wait_cmd(log);
fseek(log->f, 0x04, SEEK_SET);
uint32_t i = sizeof(vgm_header) + log->total_bytes - 4;
fwrite(&i, 1, sizeof(i), log->f);
fseek(log->f, 0x18, SEEK_SET);
i = log->total_samples;
fwrite(&i, 1, sizeof(i), log->f);
return fclose(log->f);
}