Linux 下的C语言实现播放WAV文件

#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 /*打开 dsp 失败!*/ #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_WRONLY); /*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; }/*到此设置好了DSP的各个参数*/ 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);//注意播放文件的路径哦!! fprintf(stderr,"value is %d",value); return 0; }

以上代码在嵌入式LINUX平台上测试OK!

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