Clive Wright kirjoitti: > The recently added gstreamer plugin for OSS4 has problems handling the > value returned by SNDCTL_MIX_READ for control type MIXT_MONOSLIDER16 > (and I suspect MIXT_MONOSLIDER). > > See attached extract of oss4_mixer.log > > This appears to be caused by stereo values being returned by > SNDCTL_MIX_READ for these control types. > > The OSS v4 Programmer's guide is not explicit in this situation stating > only that: > > "The current value of the mixer control will be returned in the value > field". Unfortunately there was some syntax error in the source file for the manual page for SNDCTL_MIX_EXTINFO and almost everything on that page was cut off. Anyway now the http://manuals.opensound.com/developer/SNDCTL_MIX_EXTINFO.html page contains links to the pages for all the MIXT_ types. The encoding of the value field is defined there.
In short: MIXT_SLIDER is 31 bit positive integer. MIXT_MONOSLIDER is 8 bit positive integer (0xVV) MIXT_MONOSLIDER is 16 bit positive integer (0xVVVV). MIXT_STEREOSLIDER is a pair of 8 bit positive integers (0xRRLL) MIXT_STEREOSLIDER16 is a pair of 16 bit positive integers (0xRRRRLLLL). Both LLLL and RRRR limited to 0..32767 range. Best regards, Hannu _______________________________________________ oss-devel mailing list oss-devel@mailman.opensound.com http://mailman.opensound.com/mailman/listinfo/oss-devel
