|
root@ubuntu:/home/naviwork/dsp# file /usr/lib/openoffice/basis3.2/share/gallery/sounds/wallewal.wav /usr/lib/openoffice/basis3.2/share/gallery/sounds/wallewal.wav: RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, mono 11025 Hz root@ubuntu:/home/naviwork/dsp# ./a.out /usr/lib/openoffice/basis3.2/share/gallery/sounds/wallewal.wav 16 11025 samplebits = 16 samplerate = 11025 =============================================================== #include<unistd.h> #include<fcntl.h> #include<sys/types.h> #include<sys/stat.h> #include<stdlib.h> #include<stdio.h> #include <stropts.h> #include<linux/soundcard.h> #define Audio_Device "/dev/dsp" //不同的声音有着不同的播放参数，这些参数可以使用file命令获得 #define Sample_Size 16 //there're two kinds of bits,8 bits and 16 bits #define Sample_Rate 8000 //sampling rate int play_sound(char *filename, int samplebits, int samplerate){ struct stat stat_buf; unsigned char * buf = NULL; int handler,fd; int result; int arg,status; printf("samplebits = %d samplerate = %d\n", samplebits, samplerate); //打开声音文件，将文件读入内存 fd=open(filename,O_RDONLY); if(fd<0) return -1; if(fstat(fd,&stat_buf)){ close(fd); return -1; } if(!stat_buf.st_size){ close(fd); return -1; } buf=(unsigned char *)malloc(stat_buf.st_size); if(!buf){ close(fd); return -1; } if(read(fd,buf,stat_buf.st_size)<0){ free(buf); close(fd); return -1; } //打开声卡设备，并设置声卡播放参数，这些参数必须与声音文件参数一致 handler=open(Audio_Device,O_WRONLY); if(handler==-1){ perror("open Audio_Device fail"); return -1; } arg=samplerate; status=ioctl(handler,SOUND_PCM_WRITE_RATE,&arg); if(status==-1){ perror("error from SOUND_PCM_WRITE_RATE ioctl"); return -1; } arg=samplebits; status=ioctl(handler,SOUND_PCM_WRITE_BITS,&arg); if(status==-1){ perror("error from SOUND_PCM_WRITE_BITS ioctl"); return -1; } result=write(handler,buf,stat_buf.st_size); if(result==-1){ perror("Fail to play the sound!"); return -1; } free(buf); close(fd); close(handler); return result; } int main(int argc, char *argv[]) { play_sound(argv[1], atoi(argv[2]), atoi(argv[3])); return 0; } |
|
|
