linux下声音的录制与播放 /dev/dsp

#include <unistd.h>

#include <fcntl.h>

#include <sys/types.h>

#include <sys/ioctl.h>

#include <stdlib.h>

#include <stdio.h>

#include <linux/soundcard.h>

#define LENGTH 3    /* 存储秒数 */

#define RATE 8000   /* 采样频率 */

#define SIZE 8      /* 量化位数 */

#define CHANNELS 1  /* 声道数目 */

/* 用于保存数字音频数据的内存缓冲区 */

unsigned char buf[LENGTH*RATE*SIZE*CHANNELS/8];

int main()

{

  int fd; /* 声音设备的文件描述符 */

  int arg; /* 用于ioctl调用的参数 */

  int status;   /* 系统调用的返回值 */

  /* 打开声音设备 */

  fd = open("/dev/dsp", O_RDWR);

  if (fd < 0) {

    perror("open of /dev/dsp failed");

    exit(1);

  }

  /* 设置采样时的量化位数 */

  arg = SIZE;

  status = ioctl(fd, SOUND_PCM_WRITE_BITS, &arg);

  if (status == -1)

    perror("SOUND_PCM_WRITE_BITS ioctl failed");

  if (arg != SIZE)

    perror("unable to set sample size");

  /* 设置采样时的声道数目 */

  arg = CHANNELS;

  status = ioctl(fd, SOUND_PCM_WRITE_CHANNELS, &arg);

  if (status == -1)

    perror("SOUND_PCM_WRITE_CHANNELS ioctl failed");

  if (arg != CHANNELS)

    perror("unable to set number of channels");

  /* 设置采样时的采样频率 */

  arg = RATE;

  status = ioctl(fd, SOUND_PCM_WRITE_RATE, &arg);

  if (status == -1)

    perror("SOUND_PCM_WRITE_WRITE ioctl failed");

  /* 循环，直到按下Control-C */

  while (1) {

    printf("Say something:\n");

    status = read(fd, buf, sizeof(buf)); /* 录音 */

    if (status != sizeof(buf))

      perror("read wrong number of bytes");

    printf("You said:\n");

    status = write(fd, buf, sizeof(buf)); /* 回放 */

    if (status != sizeof(buf))

      perror("wrote wrong number of bytes");

    /* 在继续录音前等待回放结束 */

    status = ioctl(fd, SOUND_PCM_SYNC, 0);

    if (status == -1)

      perror("SOUND_PCM_SYNC ioctl failed");

  }

}

还有其余的这种一边录制一边播放等各种版本，欢迎留言进行交流。。。