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Hi,<BR>
<BR>
I am running a .mp3 file using 'xine' without any issues on my Fedora Core 8 machine.<BR>
<BR>
I am reading /dev/dsp and storing it in some file.<BR>
i.e. cat /dev/dsp > musicfile<BR>
<BR>
Now I am stopping 'xine' and then writing 'musicfile' to /dev/dsp.<BR>
i.e. cat musicfile > /dev/dsp<BR>
<BR>
In this case I can hear the music but with a lot of noise in it.<BR>
Is there any way I can remove/reduce this noise from 'musicfile'?<BR>
<BR>
I also tried following program (it records the voice and plays it immediately) that I got from net to understand how to write to /dev/dsp but it does not seem to record my voice and hence plays nothing and there is noise only.<BR>
<BR>
-------------------------------------------------------<BR>
#include <unistd.h><BR>
#include <fcntl.h><BR>
#include <sys/types.h><BR>
#include <sys/ioctl.h><BR>
#include <stdlib.h><BR>
#include <stdio.h><BR>
#include <linux/soundcard.h><BR>
<BR>
#define LENGTH 3 /* how many seconds of speech to store */<BR>
#define RATE 8000 /* the sampling rate */<BR>
#define SIZE 8 /* sample size: 8 or 16 bits */<BR>
#define CHANNELS 1 /* 1 = mono 2 = stereo */<BR>
<BR>
/* this buffer holds the digitized audio */<BR>
unsigned char buf[LENGTH*RATE*SIZE*CHANNELS/8];<BR>
<BR>
int main()<BR>
{<BR>
int fd; /* sound device file descriptor */<BR>
int arg; /* argument for ioctl calls */<BR>
int status; /* return status of system calls */<BR>
<BR>
/* open sound device */<BR>
fd = open("/dev/dsp", O_RDWR);<BR>
if (fd < 0) {<BR>
perror("open of /dev/dsp failed");<BR>
exit(1);<BR>
}<BR>
<BR>
/* set sampling parameters */<BR>
arg = SIZE; /* sample size */<BR>
status = ioctl(fd, SOUND_PCM_WRITE_BITS, &arg);<BR>
if (status == -1)<BR>
perror("SOUND_PCM_WRITE_BITS ioctl failed");<BR>
if (arg != SIZE)<BR>
perror("unable to set sample size");<BR>
<BR>
arg = CHANNELS; /* mono or stereo */<BR>
status = ioctl(fd, SOUND_PCM_WRITE_CHANNELS, &arg);<BR>
if (status == -1)<BR>
perror("SOUND_PCM_WRITE_CHANNELS ioctl failed");<BR>
if (arg != CHANNELS)<BR>
perror("unable to set number of channels");<BR>
<BR>
arg = RATE; /* sampling rate */<BR>
status = ioctl(fd, SOUND_PCM_WRITE_RATE, &arg);<BR>
if (status == -1)<BR>
perror("SOUND_PCM_WRITE_WRITE ioctl failed");<BR>
<BR>
while (1) { /* loop until Control-C */<BR>
printf("Say something:\n");<BR>
status = read(fd, buf, sizeof(buf)); /* record some sound */<BR>
if (status != sizeof(buf))<BR>
perror("read wrong number of bytes");<BR>
printf("You said:\n");<BR>
status = write(fd, buf, sizeof(buf)); /* play it back */<BR>
if (status != sizeof(buf))<BR>
perror("wrote wrong number of bytes");<BR>
/* wait for playback to complete before recording again */<BR>
status = ioctl(fd, SOUND_PCM_SYNC, 0);<BR>
if (status == -1)<BR>
perror("SOUND_PCM_SYNC ioctl failed");<BR>
}<BR>
}<BR>
---------------------------------------------------------------------------------------<BR>
Regards,<BR>
Girish
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