linux 播放声音文件程序代码

最新推荐文章于 2025-06-11 16:34:59 发布

原创最新推荐文章于 2025-06-11 16:34:59 发布 · 1.4k 阅读

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#linux #buffer #file #audio #input

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本文介绍了一个使用C语言编写的简单程序，该程序能够播放指定的WAV格式的声音文件。程序通过设置位格式、声道数量及采样率来确保声音文件正确播放，并通过循环读取文件数据并写入设备实现连续播放。

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声音文件必须为Wave PCM unsigned 8bits mono格式

/* the *.wav must be 8000Hz 64kbps 8bits MONO(1)*/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <linux/soundcard.h> /*for OSS style sound programing */

#define BUFF_SIZE 512 /*buffer size:512 Bytes */

#define FMT8BITS AFMT_U8 /*unsigned 8 bits(for almost PC) */
#define FMT16BITS AFMT_S16_LE /*signed 16 bits,little endian */

#define FMT8K    8000 /*default sampling rate */
#define FMT11K   11025 /*11,22,44,48 are three pop rate */
#define FMT22K   22050
#define FMT44K   44100
#define FMT48K 48000

#define MONO 1
#define STEREO 2

int main(int argc, char *argv[])
{
    if(argc!=2)
        printf("input error! ./playvoice filename");

    int fd; //for device
fd=open("/dev/dsp",O_WRONLY);
if (fd<0){
  perror("Can't open /dev/dsp");
  return -1;
}

int outfile;
outfile=open(argv[1],O_RDONLY);
if (outfile<0) {
  perror("Cannot open file for writing");
  return -1;
}

    /* set bit format */
    int bits = FMT16BITS;
    if (ioctl(fd, SNDCTL_DSP_SETFMT, &bits) == -1) {
fprintf(stderr, "Set fmt to bit %d failed:%s/n", bits,
strerror(errno));
return (-1);
    }
    if (bits != FMT16BITS) {
fprintf(stderr, "do not support bit %d, supported 8、16/n", bits);
return (-1);
    }

    /*set channel */
    int channel = MONO;
    if ((ioctl(fd, SNDCTL_DSP_CHANNELS, &channel)) == -1) {
fprintf(stderr, "Set Audio Channels %d failed:%s/n", channel,
strerror(errno));
return (-1);
    }

/*set speed */
   int speed = FMT8K;
    if (ioctl(fd, SNDCTL_DSP_SPEED, &speed) == -1) {
fprintf(stderr, "Set speed to %d failed:%s/n", speed,
strerror(errno));
return (-1);
    }
    if (speed != FMT8K) {
fprintf(stderr, "do not support speed %d/n", speed,
speed);
return (-1);
    }

int nRD;
unsigned char buff[BUFF_SIZE]; /*sound buffer */
while(1){
if ((nRD = read(outfile, buff, BUFF_SIZE)) < 0) {
        perror("read sound data file failed");
        return(-1);
        }
   else if(nRD==0){
         perror("read over!");
         exit(0);
         }

if (fd>0)
     write(fd,buff,nRD);
}
}