mplayer移植到S3C2440（四）音量控制

设置音量的程序

#include
#include
#include
#include
#define ARM

int main(int argc, char *argv[])
{
        int volume_read,volume_write,mixerfd;
        if(argc != 3){
                printf("usage: %s volume_write volume_read\n", argv[0]);
                printf("example: %s 30 50\n",argv[0]);
                exit(-1);
        }
        volume_write = atoi(argv[1]);
        volume_read = atoi(argv[2]);
        if(volume_write <0 || volume_write > 100)
                volume_write = 30;
        if(volume_read < 0 || volume_read >100)
                volume_read = 30;

#ifdef ARM
        mixerfd = open("/dev/mixer", O_RDWR);
#else
        mixerfd = open("/dev/mixer", O_RDWR);
#endif
        if(mixerfd < 0){
                perror("Mixer open error !");
                exit(-1);
        }  
        ioctl(mixerfd,SOUND_MIXER_WRITE_VOLUME,&volume_write);
        ioctl(mixerfd,SOUND_MIXER_READ_VOLUME,&volume_read);

        close(mixerfd);

        return
}

 

参考文献

       http://blog.csdn.net/neu_sunlei/archive/2010/03/02/5339275.aspx