#include
#include
#include
#include
#include
#include
#include
/* 下面的三个参数是跟具体文件相关的，文件什么样，就要设置成什么样 */
#define RATE 44100
#define SIZE 16//16
#define CHANNELS 2 // 1表示单声道，2为立体声
/* ................ */
unsigned char buf[RATE*SIZE/8]; //buf里面正好放一秒钟的音频，下面的计时还要用
int main()
{
int fd;
int wavfd; //wav文件的描述符
int arg; /* ..ioctl..... */
int status; /* ........ */
/* ...... */
fd = open("/dev/dsp", O_WRONLY);
if (fd < 0) {
printf("open of /dev/dsp failed");
exit(1);
}
wavfd = open("./aa.wav", O_RDONLY);
if (wavfd < 0) {
printf("open of wav failed");
exit(1);
}
/* .......... */
arg = SIZE;
status = ioctl(fd, SOUND_PCM_WRITE_BITS, &arg);
if (status == -1)
perror("SOUND_PCM_WRITE_BITS ioctl failed");
if (arg != SIZE)
perror("unable to set sample size");
/* .......... */
arg = CHANNELS;
status = ioctl(fd, SOUND_PCM_WRITE_CHANNELS, &arg);
if (status == -1)
perror("SOUND_PCM_WRITE_CHANNELS ioctl failed");
if (arg != CHANNELS)
perror("unable to set number of channels");
/* .......... */
arg = RATE;
status = ioctl(fd, SOUND_PCM_WRITE_RATE, &arg);
if (status == -1)
perror("SOUND_PCM_WRITE_WRITE ioctl failed");
/* 从wav文件中读buf大小的内容，然后写入/etc/dsp中，直到文件结束 */
int time = 0; //动态显示播放时间用
while (status = read(wavfd, buf, sizeof(buf)) > 0) {
write(fd, buf, sizeof(buf));
printf("%ds, enjoy ...\n",time++);
/* 以下三句，用于在更改播放文件的参数时，播放掉缓冲区内的内容，可以用，更保险*/
/*status = ioctl(fd, SOUND_PCM_SYNC, 0);
if (status == -1)
perror("SOUND_PCM_SYNC ioctl failed");
*/
}
}
阅读(1721) | 评论(0) | 转发(0) |
