使用/dev/dsp的wav文件播放器源码

转载于：http://blog.csdn.net/dux003/article/details/5459423

#include

#include

#include

#include

#include

void usage(const char* self)

{

printf("usage:/n");

printf("/t%s
[-c channels -r rate -s samplesize] wavfile/n",
self);

};

int set_fmt(int fd, int channels, int rate, int
samplesize)

{

int c =
channels;

if
(ioctl(fd, SNDCTL_DSP_CHANNELS, &c) == -1)

exit(1);

if
(ioctl(fd, SNDCTL_DSP_SPEED, &rate) == -1)

exit(1);

if
(ioctl(fd, SNDCTL_DSP_SAMPLESIZE, &samplesize) ==
-1)

exit(1);

return
0;

}

int main(int argc, char **argv)

{

int i =
1;

char*
filename = NULL;

int channels
= 1;

int
samplerate = 8000;

int
samplesize = 16;

int
dsp;

int
fd;

char
buf[1024];

int
len;

if
(argc%2)

{

usage(argv[0]);

exit(1);

}

while (i
< argc)

{

if (argv[i][0] != '-')

{

filename = argv[i];

i++;

}

else

{

if (i+1 < argc)

{   switch
(argv[i][1])

{

case 'c':

channels = atoi(argv[i+1]);

i += 2;

break;

case 'r':

samplerate = atoi(argv[i+1]);

i += 2;

break;

case 's':

samplesize = atoi(argv[i+1]);

i += 2;

break;

default:

perror("bad option/n");

exit(1);

}

}

else

{

perror("bad options/n");

exit(1);

}

}

}

dsp =
open("/dev/dsp", O_RDWR);

if (dsp ==
-1)

{

perror("can not open /dev/dsp/n");

exit(1);

}

set_fmt(dsp,
channels, samplerate, samplesize);

fd =
open(filename, O_RDWR);

if (fd ==
-1)

{

close(dsp);

fprintf(stderr, "can not open file %s/n",
filename);

exit(1);

}

while ((len
= read(fd, buf, 1024)) > 0)

{

write(dsp, buf, len);

}

close(fd);

close(dsp);

return
0;

}