101 lines
2.7 KiB
C
101 lines
2.7 KiB
C
/* example6.c - play a streamed sample (sine wave) using triple buffering */
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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 <math.h>
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#include <audio.h>
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#if defined(_MSC_VER) || defined(__BORLANDC__) || defined(__WATCOMC__) || 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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int main(void)
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{
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AUDIOINFO info;
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AUDIOCAPS caps;
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AUDIOWAVE wave;
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HAC voice;
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int i;
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float t, dt;
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long position, chunkSize, chunkPosition;
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/* initialize 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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/* show device name */
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AGetAudioDevCaps(info.nDeviceId, &caps);
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printf("%s detected. Press any key to exit.\n", caps.szProductName);
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/* open audio voice */
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AOpenVoices(1);
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ACreateAudioVoice(&voice);
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ASetVoiceVolume(voice, 64);
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ASetVoicePanning(voice, 128);
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/* setup buffer length to 1/60th of a second */
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chunkPosition = 0;
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chunkSize = info.nSampleRate / 60;
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/* create a looped sound buffer of 3 x 1/60th secs */
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wave.nSampleRate = info.nSampleRate;
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wave.dwLength = 3 * chunkSize;
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wave.dwLoopStart = 0;
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wave.dwLoopEnd = wave.dwLength;
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wave.wFormat = AUDIO_FORMAT_8BITS | AUDIO_FORMAT_MONO | AUDIO_FORMAT_LOOP;
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ACreateAudioData(&wave);
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/* clean up sound buffer */
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memset(wave.lpData, 0, wave.dwLength);
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AWriteAudioData(&wave, 0, wave.dwLength);
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/* setup 200 Hz sine wave parameters */
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t = 0.0;
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dt = 2.0 * M_PI * 200.0 / wave.nSampleRate;
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printf("%d-bit %s %u Hz, buffer size = %ld, chunk size = %ld\n",
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info.wFormat & AUDIO_FORMAT_16BITS ? 16 : 8,
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info.wFormat & AUDIO_FORMAT_STEREO ? "stereo" : "mono",
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info.nSampleRate, wave.dwLength, chunkSize);
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/* start playing the sound buffer */
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APlayVoice(voice, &wave);
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while (!kbhit()) {
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/* do not fill more than 'chunkSize' samples */
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AUpdateAudioEx(chunkSize);
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/* update the chunk of samples at 'chunkPosition' */
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AGetVoicePosition(voice, &position);
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if (position < chunkPosition || position >= chunkPosition + chunkSize) {
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for (i = 0; i < chunkSize; i++)
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wave.lpData[chunkPosition++] = 64.0 * sin(t += dt);
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AWriteAudioData(&wave, chunkPosition - chunkSize, chunkSize);
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if (chunkPosition >= wave.dwLength)
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chunkPosition = 0;
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}
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}
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/* stop playing the buffer */
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AStopVoice(voice);
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/* release sound buffer */
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ADestroyAudioData(&wave);
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/* release audio voices */
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ADestroyAudioVoice(voice);
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ACloseVoices();
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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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