使用c语言编写播放从do到高音do的声音的程序
时间: 2023-06-15 20:06:59 浏览: 132
要使用C语言编写播放音频的程序,需要使用音频库。以下是使用PortAudio库实现的示例代码,可以播放从低音Do到高音Do的音频。
```
#include <stdio.h>
#include <math.h>
#include "portaudio.h"
#define SAMPLE_RATE (44100)
#define FRAMES_PER_BUFFER (64)
#define TWO_PI (3.14159265f * 2.0f)
typedef struct {
float frequency;
float phase;
} sine_data;
static int sine_callback(const void *inputBuffer, void *outputBuffer,
unsigned long framesPerBuffer,
const PaStreamCallbackTimeInfo *timeInfo,
PaStreamCallbackFlags statusFlags,
void *userData) {
float *out = (float *)outputBuffer;
sine_data *data = (sine_data *)userData;
unsigned int i;
(void)inputBuffer;
for (i = 0; i < framesPerBuffer; i++) {
*out++ = sinf(data->phase);
data->phase += TWO_PI * data->frequency / SAMPLE_RATE;
if (data->phase > TWO_PI) {
data->phase -= TWO_PI;
}
}
return paContinue;
}
int main() {
PaStream *stream;
PaError err;
sine_data data = {0};
printf("Playing sine wave...\n");
data.frequency = 261.63; // C4
err = Pa_Initialize();
if (err != paNoError) {
printf("PortAudio initialization failed: %s\n", Pa_GetErrorText(err));
return 1;
}
err = Pa_OpenDefaultStream(&stream, 0, 1, paFloat32, SAMPLE_RATE,
FRAMES_PER_BUFFER, sine_callback, &data);
if (err != paNoError) {
printf("PortAudio stream opening failed: %s\n", Pa_GetErrorText(err));
return 1;
}
err = Pa_StartStream(stream);
if (err != paNoError) {
printf("PortAudio stream starting failed: %s\n", Pa_GetErrorText(err));
return 1;
}
printf("Press Enter to stop.\n");
getchar();
err = Pa_StopStream(stream);
if (err != paNoError) {
printf("PortAudio stream stopping failed: %s\n", Pa_GetErrorText(err));
return 1;
}
err = Pa_CloseStream(stream);
if (err != paNoError) {
printf("PortAudio stream closing failed: %s\n", Pa_GetErrorText(err));
return 1;
}
Pa_Terminate();
return 0;
}
```
这个程序使用sine_callback函数生成正弦波,并通过PortAudio库输出到音频设备。在主函数中,我们指定了播放的频率为261.63 Hz,即中央C音。如果你想播放其他的频率,只需要修改data.frequency的值即可。
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