#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <linux/soundcard.h>
#define OPEN_DSP_FAILED 0x00000001 /*開啟 dsp 失敗!*/
#define SAMPLERATE_STATUS 0x00000002 /*samplerate status failed*/
#define SET_SAMPLERATE_FAILED 0x00000003 /*set samplerate failed*/
#define CHANNELS_STATUS 0x00000004 /*Channels status failed*/
#define SET_CHANNELS_FAILED 0x00000005 /*set channels failed*/
#define FMT_STATUS 0x00000006 /*FMT status failed*/
#define SET_FMT_FAILED 0x00000007 /*set fmt failed*/
#define OPEN_FILE_FAILED 0x00000008 /*opem filed failed*/
int P8100_Audio_Play(char *pathname,int nSampleRate,int nChannels,int fmt)
{
int dsp_fd,mix_fd,status,arg;
dsp_fd = open("/dev/dsp" , O_RDWR); /*open dsp*/
if(dsp_fd < 0)
{
return OPEN_DSP_FAILED;
}
arg = nSampleRate;
status = ioctl(dsp_fd,SOUND_PCM_WRITE_RATE,&arg); /*set samplerate*/
if(status < 0)
{
close(dsp_fd);
return SAMPLERATE_STATUS;
}
if(arg != nSampleRate)
{
close(dsp_fd);
return SET_SAMPLERATE_FAILED;
}
arg = nChannels; /*set channels*/
status = ioctl(dsp_fd, SOUND_PCM_WRITE_CHANNELS, &arg);
if(status < 0)
{
close(dsp_fd);
return CHANNELS_STATUS;
}
if( arg != nChannels)
{
close(dsp_fd);
return SET_CHANNELS_FAILED;
}
arg = fmt; /*set bit fmt*/
status = ioctl(dsp_fd, SOUND_PCM_WRITE_BITS, &arg);
if(status < 0)
{
close(dsp_fd);
return FMT_STATUS;
}
if(arg != fmt)
{
close(dsp_fd);
return SET_FMT_FAILED;
}/*到此設定好了DSP的各個參數*/
FILE *file_fd = fopen(pathname,"r");
if(file_fd == NULL)
{
close(dsp_fd);
return OPEN_FILE_FAILED;
}
int num = 3*nChannels*nSampleRate*fmt/8;
int get_num;
char buf[num];
while(feof(file_fd) == 0)
{
get_num = fread(buf,1,num,file_fd);
write(dsp_fd,buf,get_num);
if(get_num != num)
{
close(dsp_fd);
fclose(file_fd);
return 0;
}
}
close(dsp_fd);
fclose(file_fd);
return 0;
}
/*
*test
*/
int main()
{
int value;
value = P8100_Audio_Play("/windows/C/WINDOWS/Media/Windows Startup.wav",44100,2,16);//注意播放檔案的路徑哦!!
fprintf(stderr,"value is %d",value);
return 0;
}