88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
/* example3.c - play a waveform file */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <audio.h>
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#if defined(_MSC_VER) || defined(__WATCOMC__) || defined(__BORLANDC__) || defined(__DJGPP__)
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#include <conio.h>
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#else
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#define kbhit() 0
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#endif
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#define NUMVOICES 3*3
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#define FREQ(nPeriod) (((LONG) lpWave->nSampleRate * 428) / nPeriod)
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UINT aPeriodTable[48] =
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{ /* C C# D D# E F F# G G# A A# B */
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856,808,762,720,678,640,604,570,538,508,480,453,
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428,404,381,360,339,320,302,285,269,254,240,226,
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214,202,190,180,170,160,151,143,135,127,120,113,
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107,101,95,90,85,80,75,71,67,63,60,56
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};
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int main(void)
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{
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AUDIOINFO info;
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LPAUDIOWAVE lpWave;
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HAC hVoice[NUMVOICES];
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BOOL stopped;
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UINT n, m;
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/* initialize audio library */
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AInitialize();
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/* open audio device */
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info.nDeviceId = AUDIO_DEVICE_MAPPER;
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info.wFormat = AUDIO_FORMAT_16BITS | AUDIO_FORMAT_STEREO;
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info.nSampleRate = 44100;
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AOpenAudio(&info);
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/* load waveform file */
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ALoadWaveFile("test.wav", &lpWave, 0);
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/* open and allocate voices */
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AOpenVoices(NUMVOICES);
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for (n = 0; n < NUMVOICES; n++) {
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ACreateAudioVoice(&hVoice[n]);
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ASetVoiceVolume(hVoice[n], 64);
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ASetVoicePanning(hVoice[n], n & 1 ? 0 : 255);
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}
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/* program main execution loop */
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printf("Playing waveform, press any key to stop.\n");
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for (n = m = 0; !kbhit() && n < 48 - 7; n++) {
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/* play chord C-E-G */
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APlayVoice(hVoice[m+0], lpWave);
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APlayVoice(hVoice[m+1], lpWave);
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APlayVoice(hVoice[m+2], lpWave);
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ASetVoiceFrequency(hVoice[m+0], FREQ(aPeriodTable[n+0]));
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ASetVoiceFrequency(hVoice[m+1], FREQ(aPeriodTable[n+4]));
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ASetVoiceFrequency(hVoice[m+2], FREQ(aPeriodTable[n+7]));
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m = (m + 3) % NUMVOICES;
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/* wait until note finishes */
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do {
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/* update audio system */
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AUpdateAudio();
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AGetVoiceStatus(hVoice[0], &stopped);
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} while (!stopped);
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}
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/* stop and release voices */
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for (n = 0; n < NUMVOICES; n++) {
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AStopVoice(hVoice[n]);
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ADestroyAudioVoice(hVoice[n]);
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}
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ACloseVoices();
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/* release the waveform file */
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AFreeWaveFile(lpWave);
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/* close audio device */
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ACloseAudio();
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return 0;
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}
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