109 lines
2.5 KiB
C
109 lines
2.5 KiB
C
/*============================================================
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Test code for emu2413.c
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Write 2 seconds of the piano tone into temp.wav
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gcc -Wall -lm sample2413.c emu2413.c
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(The author had tried to compile on Solaris7 with gcc 2.8.1)
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=============================================================*/
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#include "emu2413.h"
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#include <stdio.h>
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#include <time.h>
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/*
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* Standard clock = MSX clock
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*/
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#define MSX_CLK 3579545
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#define SAMPLERATE 44100
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#define DATALENGTH (SAMPLERATE * 8)
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static void WORD(char *buf, uint32_t data) {
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buf[0] = data & 0xff;
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buf[1] = (data & 0xff00) >> 8;
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}
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static void DWORD(char *buf, uint32_t data) {
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buf[0] = data & 0xff;
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buf[1] = (data & 0xff00) >> 8;
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buf[2] = (data & 0xff0000) >> 16;
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buf[3] = (data & 0xff000000) >> 24;
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}
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static void chunkID(char *buf, char id[4]) {
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buf[0] = id[0];
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buf[1] = id[1];
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buf[2] = id[2];
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buf[3] = id[3];
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}
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int main(void) {
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static char wave[DATALENGTH * 2];
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char filename[16] = "temp.wav";
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char header[46];
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int i;
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clock_t start, finish;
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FILE *fp;
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OPLL *opll;
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/*
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* Create WAVE header
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*/
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chunkID(header, "RIFF");
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DWORD(header + 4, DATALENGTH * 2 + 36);
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chunkID(header + 8, "WAVE");
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chunkID(header + 12, "fmt ");
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DWORD(header + 16, 16);
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WORD(header + 20, 1); /* WAVE_FORMAT_PCM */
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WORD(header + 22, 1); /* channel 1=mono,2=stereo */
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DWORD(header + 24, SAMPLERATE); /* samplesPerSec */
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DWORD(header + 28, 2 * SAMPLERATE); /* bytesPerSec */
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WORD(header + 32, 2); /* blockSize */
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WORD(header + 34, 16); /* bitsPerSample */
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chunkID(header + 36, "data");
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DWORD(header + 40, 2 * DATALENGTH);
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opll = OPLL_new(MSX_CLK, SAMPLERATE);
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OPLL_reset(opll);
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OPLL_writeReg(opll, 0x30, 0x30); /* select PIANO Voice to ch1. */
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OPLL_writeReg(opll, 0x10, 0x80); /* set F-Number(L). */
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OPLL_writeReg(opll, 0x20, 0x15); /* set BLK & F-Number(H) and
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* keyon. */
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start = clock();
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i = 0;
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for (i = 0; i < DATALENGTH; i++) {
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WORD(wave + i * 2, OPLL_calc(opll));
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}
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finish = clock();
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OPLL_delete(opll);
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printf("It has been %f sec to calc %d waves.\n", (double)(finish - start) / CLOCKS_PER_SEC, DATALENGTH);
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printf("%f times faster than real YM2413.\n",
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((double)DATALENGTH / SAMPLERATE) / ((double)(finish - start) / CLOCKS_PER_SEC));
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fp = fopen(filename, "wb");
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if (fp == NULL)
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return 1;
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fwrite(header, 46, 1, fp);
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fwrite(wave, DATALENGTH, 2, fp);
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fclose(fp);
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printf("Wrote : %s\n", filename);
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return 0;
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}
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