[linux-audio-dev] problem w/ /dev/dsp

New Message Reply About this list Date view Thread view Subject view Author view Other groups

Subject: [linux-audio-dev] problem w/ /dev/dsp
From: zachary lieberman (zlieb_AT_parsons.edu)
Date: Wed Jun 26 2002 - 19:47:00 EEST

hi all,

I am new to audio linux programming but am excited about what I've read
about low latency and multichannel support. I am running alsa with oss
emulation on a system w/ a soundblaster live card.
I am able to compile and run sound input recording apps (like parrot.c)
which don't use a buffer input fine. I am trying to compile some code
which uses a buffered input. The main problem is that

        audio_buf_info info;
        ioctl(fd, SNDCTL_DSP_GETISPACE, &info)
        return info.bytes

returns a negative number, specifically "-17073743864"

this is after I set the sample rate to 22,050

before that, I get

        ioctl(audioport, SNDCTL_DSP_GETISPACE, &info);
        printf("Input buffering Information\n");
        printf("\tInput fragments available: %d\n", info.fragments);
        printf("\tTotal input fragments: %d\n", info.fragstotal);
        printf("\tInput Fragment Size: %d\n", info.fragsize);
        printf("\tBytes that can be read: %d\n", info.bytes);

returning 0,2,4096,and 0 respectively

any advice about order of operations that might help?

thanks in advance for any advice...

best, zach

New Message Reply About this list Date view Thread view Subject view Author view Other groups

This archive was generated by hypermail 2b28 : Wed Jun 26 2002 - 19:56:48 EEST