From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Thu, 29 Nov 2001 14:39:25 -0500 From: "Henry A. Leinhos" Subject: sound input from /dev/dsp To: linuxppc-dev@lists.linuxppc.org Message-id: <3C068EED.6050105@npt.nuwc.navy.mil> MIME-version: 1.0 Content-type: text/plain; format=flowed; charset=us-ascii Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: Hi, I'm writing an application that writes to and reads from the sound device (/dev/dsp), and have been having some trouble with the Burgundy input sound device driver (the sound out seems to work fine). I can run the same application on a machine with the Screamer (i.e. dual G4) sound device without any trouble, but reading the burgundy device gives me nothing but zeros. When I read from /dev/dsp, I notice that I'm getting interrupts, and the read returns data, but the data are all zeros. I get the same behavior when using an application like grecord (I get data, but they're all zeros). I'm currently using Kaoru Fukui's 2.4.8-pre1_0a, compiled on a single cpu B&W G3 (400MHz), as well as a dual G4 (400MHz w/SMP). I've tried compiling Kaoru's 2.4.10 kernel, but have been having some boot-up issues. Before I rsync to any more current tree, is there something I'm doing that's obviously wrong? Thanks in advance, Henry ----------------------------------------- Background (burgundy machine): (cat /proc/cpuinfo) processor : 0 cpu : 750 temperature : 0 C clock : 400MHz revision : 130.1 (pvr 0008 8201) bogomips : 796.26 zero pages : total: 0 (0Kb) current: 0 (0Kb) hits: 0/0 (0%) machine : PowerMac1,1 motherboard : PowerMac1,1 MacRISC Power Macintosh L2 cache : 1024K unified memory : 384MB pmac-generation : NewWorld (cat /dev/sndstat) PowerMac Burgundy DMA sound driver rev 016 : Core driver edition 01.06 : PowerMac Built-in Sound driver edition 00.06 44100 s: s/sec HW AFMTS: signed 16 bit BE signed 16 bit LE === Formats & settings === Parameter soft hard Format : signed 16 bit BE signed 16 bit BE Samp Rate: 44100 s/sec 44100 s/sec Channels : stereo stereo === Sound Queue status === Allocated: Buffers Size write: 4 32768 read: 4 32768 Current : MaxFrg FragSiz MaxAct Frnt Rear Cnt RrSize A B S L xruns write: 4 32768 4 0 -1 0 0 0 1 0 1 1 read: 4 32768 4 3 2 0 0 1 1 0 1 2576 ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/