hi all
I wanted an application to open /dev/dsp and write bytes
from a wav file . In line with this ,i had used the following ioctl
calls appropriately in my program .
Please note that the codei hav used below below is from a
open source application which i found on the internet.
arg=sampling size;/*like 8 or 16 bits*/
status = ioctl(fd, SOUND_PCM_WRITE_BITS, &arg);
arg=channels;/*1 for mono,2 for stereo*/
status = ioctl(fd, SOUND_PCM_WRITE_CHANNELS, &arg);
arg = rate; /* sampling rate */
status = ioctl(fd, SOUND_PCM_WRITE_RATE, &arg);
/* wait for playback to complete before recording again */
status = ioctl(fd, SOUND_PCM_SYNC, 0);
At first the program worked well.
However ,on rebooting the computer my application failed to
run.--i got an invalid ioctl command for SOUND_PCM_WRITE_BITS.
Moreover ,on trying to use mpg123 to play a mp3 file i
got the following error:-
SNDCTL_DSP_SETFRAGMENT: Inappropriate ioctl for device
I do not undertstand what is wrong.
Did my previous ioctl calls change some variables in
soundcard.h?
Can anybody out there help me?
Regards
Prakash Gs
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