Date: Tue, 9 Sep 1997 16:30:28 +0200 (MET DST) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: multimedia@freebsd.org Cc: luigi@labinfo.iet.unipi.it (Luigi Rizzo) Subject: any experience with sb16 and fullduplex ? Message-ID: <199709091430.QAA19260@labinfo.iet.unipi.it>
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I know probably noone has the answer but... does anyone have experience with the SB16 used in full duplex ? I am doing some tests with vat here and although I have it working, let's say that it does not behave as I expect... e.g. the only way I currently managed to make things work is to use signed formats on both channels, e.g capture AFMT_S8, playback AFMT_S16_LE or capture AFMT_S16_LE, playback AFMT_S8 I wonder if anyone is aware of restrictions in the use of the card in full duplex. I have a program dated 1994 downloaded from the Creative www server which uses the card in full duplex, with a big disclaimer that it might not work on future cards etc.etc. and does the following: * This program does a 16-bit recording to disk, then after about 1 second * starts an 8-bit playback from the same file. The recording format is * 16-bit signed. For playback, the low byte of each sample is discarded to * convert it to 8-bit signed. (Note that the usual format for an 8-bit * recording is UNsigned. I programmed it for 8-bit signed for avoid the * unsigned to signed conversion.) I am not sure the use of signed format on both channels is just a matter of convenience or it serves to circumvent some limitation in the hardware... Anyways it seems to work, and possibly tonight I will make another snap for the impatients. Cheers Luigi
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