linux 下音频的录制与播放测试例子

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main.c文件

#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include "sndtools.h"int main(int argc, char const *argv[]){    char *buf;    int dwSize;    if(!OpenSnd()){//打开声音设备        printf("Open sound device error!＼＼n");        exit(-1);    }    //SetFormat(FMT16BITS, FMT8K, WAVOUTDEV);    SetFormat(FMT16BITS, FMT8K);    //SetChannel(MONO, WAVOUTDEV);    SetChannel(MONO);    buf = (char *)malloc(320);    if(buf == NULL) exit(-1);    int i;    printf("begin...\n");    for(i = 0; i <1000; i++){        dwSize = Record(buf, 640); //录音        dwSize = Play(buf, dwSize);//播放    }    printf("close...\n");    CloseSnd();    return 0;}

sndtools.c文件

#include <stdio.h>#include <fcntl.h>#include <unistd.h>#include <sys/ioctl.h>#include <string.h>#define VAR_STATIC#include "sndtools.h"int devfd = 0;//打开音响设备,如果成功返回1,否则返回0。int OpenSnd(void){    if(devfd > 0)         close(devfd);    devfd = open(DEV_NAME, O_RDWR);    if(devfd < 0)        return 0;    return 1;}/** 设置录制播放格式* 如果成功返回1,否则返回0。* bits -- FMT8BITS(8bits), FMT16BITS(16bits)* hz -- FMT8K(8000HZ), FMT16K(16000HZ), FMT22K(22000HZ), FMT44K(44000HZ)*/// SetFormat(FMT16BITS, FMT8K);int SetFormat(int bits, int hz){    int tmp = bits;    if( -1 == ioctl(devfd, SNDCTL_DSP_SETFMT, &tmp)){        printf("Set fmt to s16_little faile\r\n");        return 0;    }    tmp = hz;    if( -1 == ioctl(devfd, SNDCTL_DSP_SPEED, &tmp)){        printf("Set speed to %d\r\n", hz);        return 0;    }    return 1;}/** 声卡设置通道* 如果成功返回1,否则返回0。* chn -- MONO, STERO*///MONOint SetChannel(int chn){    int tmp = chn;    if(-1 == ioctl(devfd, SNDCTL_DSP_CHANNELS, &tmp)){        printf("Set Audio Channel faile\r\n");        return 0;    }    return 1;}/** 记录* 返回读取的字节数量。*/int Record(char *buf, int size){    return read(devfd, buf, size);}/** 回放* 返回的字节数量写。*/int Play(char *buf, int size){  return write(devfd, buf, size);}//关闭声音设备,如果成功返回1,否则返回0。int CloseSnd(void){    close(devfd);    devfd = 0;    return 1;}

sndtools.h文件

#ifndef SNDTOOLS_H#define SNDTOOLS_H#include <linux/soundcard.h>#define FMT8BITS   AFMT_S8_LE  #define FMT16BITS  AFMT_S16_LE#define DEV_NAME   "/dev/dsp" #define FMT8K      8000#define FMT16K     16000#define FMT22K     22000#define FMT44K     44000#define MONO       1#define STERO      2#ifndef VAR_STATICextern int devfd;extern int CapMask;#endif #define  DEBUG()            //printf("Time=[%s] FILE=[%s] LINE=[%d]\n",__TIME__,__FILE__,__LINE__);#define  ERR_EXIT(m)        (perror(m),exit(EXIT_FAILURE))//打开声音设备,如果打开成功返回1//否则返回0int OpenSnd(void);//关闭声音设备int CloseSnd(void);//记录或回放设置格式,如果成功返回1//否则返回0int SetFormat(int bits, int hz);//设置记录或回放通道,如果成功返回1//返回1int SetChannel(int chn);//记录int Record(char *buf, int size);//播放int Play(char *buf, int size);#endif

makefile文件

OBJS = main.o sndtools.oTARGET = outCC = gcc$(TARGET):$(OBJS)$(CC) -O2 -o $(TARGET) $(OBJS)clean:-$(RM) $(TARGET)-$(RM) $(OBJS)

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