Linux ALSA录音与播放示例

#include <stdio.h>
#include <unistd.h>
#include <stdbool.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/soundcard.h>
#include <fcntl.h>
#include <error.h>
#include <errno.h>
#include <pthread.h>
#include "wave.h"

/******************************/
//record args
#define SIZE 16    //sample size
#define CHANNELS 1  //sample channels number
#define SPEED   8000 //sample speed 
/*****************************/
#define BUFSIZE 320    //memory buffer size

bool flag_record_start = false;  //record flag
bool flag_play_start  = false; //play flag
bool flag_exit = false; //exit flag
char buffer[BUFSIZE]; //memory buffer

struct wave_head s = {
filechunkid : "RIFF" ,
rifftype : "WAVE",
fmtchunkid : "fmt " ,
fmtchunklen : 16 ,

datachunkid : "data",
};

void prompt(void)
{
printf("\n****************************************");
        printf("\n         Record-Play Test               ");
        printf("\nRecord : Press r key");
        printf("\nPlay   : Press p key");
printf("\nVolume+: Press i key");
printf("\nVolume-: Press d key");
printf("\nMIC+  : Press t key");
printf("\nMIC-   : Press h key");
printf("\nQuit   : Press q key");
        printf("\n****************************************\n");
}

void setArg(int device_fd,int size,int channels,int speed)
{
int arg;
int ioctl_status;

//ioctl set sample size
        arg = size;
        printf("Set sample size:SNDCTL_DSP_SETFMT(%d)\n",arg);
        ioctl_status = ioctl(device_fd,SNDCTL_DSP_SETFMT,&arg);
        if(-1 == ioctl_status)
        {
                perror("Ioctl set sample size failure:");
        }