Messages in this thread | | | Subject | Sound recording problems | From | Pablo Baena <> | Date | 25 Jul 2003 18:48:19 +0000 |
| |
Hi! I tried the linux-sound list without luck, so I try this list. I'm having recording troubles with my computer. I say my computer, because I've already tried 3 different sound cards, and 2 kernels, with strange results.
I'll focus on my actual configuration, so I can debug the problem. I have a SB16 Awe ISA, and I tried the OSS drivers with 2.6.0-test1. I have a VIAC686 motherboard, with a K7 650Mhz processor.
The sample program I attach, do record the sound. Please notice the commented snip that doesn't work, it is stopping a lot of programs from working.
Also, if I try doing a
cat /dev/dsp > bla.raw
the result file is full of 7F's (doesn't hear anything). This is just a sample of the problems I have with lots of other recording programs.
Can you help me debug this? What should I do? What information should I reunite?
Please reply to my own address, since I'm not subscribed to the list.
TIA!! -- Whip it, baby. Whip it right. Whip it, baby. Whip it all night! // Stolen from nuvrec: http://mars.tuwien.ac.at/~roman/nuppelvideo/ #include <sys/soundcard.h> #include <fcntl.h> #include <sys/ioctl.h> #include <stdio.h> #include <signal.h>
int ostr=0; long audio_buffer_size=0;
static void sighandler(int i) { if (ostr) { close(ostr); } printf ("\n"); exit(0); }
int main (int argc, char** argv) { int afmt, afd, frag, channels, rate, blocksize, trigger, lastread; char audiodevice[] = "/dev/dsp"; unsigned char* buffer;
ostr=open(argv[1],O_WRONLY|O_CREAT, 0644);
if (ostr==-1) return(-1);
if (-1 == (afd = open(audiodevice, O_RDONLY))) { fprintf(stderr, "\n%s\n", "Cannot open DSP, exiting"); exit(1); }
signal(SIGINT, sighandler); // install sighaendler ioctl(afd, SNDCTL_DSP_RESET, 0); frag=(8<<16)|(10);//8 buffers, 1024 bytes each ioctl(afd, SNDCTL_DSP_SETFRAGMENT, &frag);
afmt = AFMT_S16_LE; ioctl(afd, SNDCTL_DSP_SETFMT, &afmt); if (afmt != AFMT_S16_LE) { fprintf(stderr, "\n%s\n", "Can't get 16 bit DSP, exiting"); exit; }
channels = 2; ioctl(afd, SNDCTL_DSP_CHANNELS, &channels); // sample rate rate = 44100; ioctl(afd, SNDCTL_DSP_SPEED, &rate);
if (-1 == ioctl(afd, SNDCTL_DSP_GETBLKSIZE, &blocksize)) { fprintf(stderr, "\n%s\n", "Can't get DSP blocksize, exiting"); exit; }
blocksize*=4; // allways read 4*blocksize audio_buffer_size = blocksize;
// This doesn't work!! Throws: Resource temporarily unavailable! // when reading. // trigger record trigger = ~PCM_ENABLE_INPUT; ioctl(afd,SNDCTL_DSP_SETTRIGGER,&trigger); trigger = PCM_ENABLE_INPUT; ioctl(afd,SNDCTL_DSP_SETTRIGGER,&trigger); //
buffer = (char *)malloc(audio_buffer_size);
while(1) { if (audio_buffer_size != (lastread = read(afd,buffer,audio_buffer_size))) { fprintf(stderr, "only read %d from %ld bytes from '%s'\n", lastread, audio_buffer_size, audiodevice); perror("read /dev*audiodevice"); if (lastread == -1) exit (1); } else { fprintf(stderr, "."); write(ostr, buffer, audio_buffer_size); } } }
| |