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I have a G3 iBook 800 MHz Rev. 2.2 with vanilla kernel 2.6.10. The kernel ALSA driver as well as OSS emulation are activated, for the kernel config see below. I did not succeed in getting hydrogen-0.9.0 to play flawless sound hydrogen can play via OSS and via JACK. OSS: running hydrogen gives the message: $ hydrogen [WARNING] PreferencesMng [readXmlString] Using default value in QTStyle Hydrogen 0.9.0 [Jan 2 2005] - Copyright 2002-2004 Alessandro Cominu Compiled modules: (Alsa seq) (FLAC) (Jack) (OSS) (LRDF) Hydrogen comes with ABSOLUTELY NO WARRANTY This is free software, and you are welcome to redistribute it under certain conditions. See the file COPYING for details [LadspaFX::getPluginList] reading directory: /usr/lib/ladspa [LadspaFX::getLadspaFXGroup] [LadspaFX::getPluginList] reading directory: /usr/lib/ladspa [WARNING] Hydrogen [audioEngine_setupLadspaFX] m_pSong=NULL [WARNING] OssDriver Can't set realtime scheduling for OSS Driver Now I open a demo file and klick on play. All I get is white noise (could this be a PPC endian-problem?) OSS-output of other applicatians (of course not parallel to hydrogen) was just fine. JACK: In files->preferences I changed the output to jack and restarted hydrogen. jackd was running at 44.1 kHz. Now I got this on hydrogen startup: hydrogen [WARNING] PreferencesMng [readXmlString] Using default value in QTStyle Hydrogen 0.9.0 [Jan 2 2005] - Copyright 2002-2004 Alessandro Cominu Compiled modules: (Alsa seq) (FLAC) (Jack) (OSS) (LRDF) Hydrogen comes with ABSOLUTELY NO WARRANTY This is free software, and you are welcome to redistribute it under certain conditions. See the file COPYING for details [LadspaFX::getPluginList] reading directory: /usr/lib/ladspa [LadspaFX::getLadspaFXGroup] [LadspaFX::getPluginList] reading directory: /usr/lib/ladspa [WARNING] Hydrogen [audioEngine_setupLadspaFX] m_pSong=NULL jack_create_thread: error 11 creating real-time thread by inheritance: Resourcetemporarily unavailable [ERROR] Hydrogen [audioEngine_startAudioDrivers] Error starting audio driver [audioDriver::connect()] [ERROR] Hydrogen [audioEngine_setupLadspaFX] nBufferSize=0 [ERROR] NullDriver [setBpm] not implemented yet [ERROR] NullDriver [setBpm] not implemented yet And in hydrogen there immediately appear two error windows: (1) Jack driver: Cannot activate client (2) Error starting audio driver. I should remark that the jack output of alsaplayer -o jack worked, so there should not be a problem with jackd. relevant part of kernel-config: # # Advanced Linux Sound Architecture # CONFIG_SND=m CONFIG_SND_TIMER=m CONFIG_SND_PCM=m CONFIG_SND_RAWMIDI=m CONFIG_SND_SEQUENCER=m # CONFIG_SND_SEQ_DUMMY is not set CONFIG_SND_OSSEMUL=y CONFIG_SND_MIXER_OSS=m CONFIG_SND_PCM_OSS=m CONFIG_SND_SEQUENCER_OSS=y # CONFIG_SND_VERBOSE_PRINTK is not set # CONFIG_SND_DEBUG is not set # # Generic devices # CONFIG_SND_VIRMIDI=m # # ALSA PowerMac devices # CONFIG_SND_POWERMAC=m # emerge info Portage 2.0.51-r8 (default-ppc-2004.1, gcc-3.4.3, glibc-2.3.4.20041102-r0, 2.6.10 ppc) ================================================================= System uname: 2.6.10 ppc 750FX Gentoo Base System version 1.6.8 Python: dev-lang/python-2.2.2,dev-lang/python-2.3.4 [2.3.4 (#1, Sep 16 2004, 23:11:34)] distcc 2.18.3 powerpc-unknown-linux-gnu (protocols 1 and 2) (default port 3632)[disabled] dev-lang/python: 2.2.2, 2.3.4 sys-devel/autoconf: 2.13, 2.59-r6 sys-devel/automake: 1.8.5-r2, 1.5, 1.9.3, 1.6.3, 1.7.9, 1.4_p6 sys-devel/binutils: 2.15.90.0.3-r4 sys-devel/libtool: 1.5.10-r2 virtual/os-headers: 2.4.18-r2, 2.4.22 ACCEPT_KEYWORDS="ppc ~ppc" AUTOCLEAN="yes" CFLAGS="-O2 -pipe -mcpu=750 -fsigned-char -mpowerpc-gfxopt" CHOST="powerpc-unknown-linux-gnu" CONFIG_PROTECT="/etc /usr/kde/2/share/config /usr/kde/3.2/share/config /usr/kde/3.3/env /usr/kde/3.3/share/config /usr/kde/3.3/shutdown /usr/kde/3/share/config/usr/lib/X11/xkb /usr/share/config /usr/share/texmf/dvipdfm/config/ /usr/share/texmf/dvips/config/ /usr/share/texmf/tex/generic/config/ /usr/share/texmf/tex/platex/config/ /usr/share/texmf/xdvi/ /var/qmail/control" CONFIG_PROTECT_MASK="/etc/gconf /etc/terminfo /etc/env.d" CXXFLAGS="-O2 -pipe -mcpu=750 -fsigned-char -mpowerpc-gfxopt" DISTDIR="/usr/portage/distfiles" FEATURES="autoaddcvs ccache distlocks" GENTOO_MIRRORS="ftp://gentoo.inode.at/source/ ftp://linux.rz.ruhr-uni-bochum.de/gentoo-mirror/ http://gd.tuwien.ac.at/opsys/linux/gentoo/" LDFLAGS="" MAKEOPTS="-j2" PKGDIR="/usr/portage/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/usr/local/portage" SYNC="rsync://rsync.gentoo.org/gentoo-portage" USE="X aalib alsa apache2 apm arts audiofile berkdb bitmap-fonts blas bzlib caps cdparanoia crypt cups dba divx4linux doc dvd encode exif f77 flac font-server fortran gcj gd gdbm gif gnome-libs gphoto2 gpm gtk gtk2 guile icq imlib innodb jack jack-tmpfs java jpeg kde ladcca ladspa lcms libcaca libwww live lzo mad maildir matroska monkey motif mpeg mysql ncurses nls objc offensive oggvorbis opengloss pam pdflib perl png ppc python qt readline samba sasl sdl slang sndfile speex spell ssl tcltk tcpd tetex theora tiff truetype truetype-fonts type1-fonts usb wmf xine xml xml2 xmms xprint xv xvid xvmc zlib video_cards_radeon"
When I run hydrogen on JACK as root (the above report was as user), I get: # hydrogen [WARNING] PreferencesMng [readXmlString] Using default value in QTStyle Hydrogen 0.9.0 [Jan 2 2005] - Copyright 2002-2004 Alessandro Cominu Compiled modules: (Alsa seq) (FLAC) (Jack) (OSS) (LRDF) Hydrogen comes with ABSOLUTELY NO WARRANTY This is free software, and you are welcome to redistribute it under certain conditions. See the file COPYING for details [LadspaFX::getPluginList] reading directory: /usr/lib/ladspa [LadspaFX::getLadspaFXGroup] [LadspaFX::getPluginList] reading directory: /usr/lib/ladspa [ERROR] JackDriver [JackDriver::init] Jack server not running? (jack_client_new) [ERROR] Hydrogen [audioEngine_startAudioDrivers] Error starting audio driver [audioDriver::init()] [WARNING] Hydrogen [audioEngine_setupLadspaFX] m_pSong=NULL [ERROR] Hydrogen [audioEngine_setupLadspaFX] nBufferSize=0 [ERROR] NullDriver [setBpm] not implemented yet and I get only 1 error window: "Error starting audio driver" The OSS behaviour seems to be the same independent from user/root.
another update: running hydrogen/jack as root works. (I was stupid enough to run jackd as user and hydrogen as root in my last posting.) So concerning the jack output it seems to be some permission problem.
Finally I learned how to handle realtime capabilities on a 2.6 kernel. I got hydrogen + jack working for normal users. There is still the noisy ALSA output.
check your sample rates.
The term ALSA should have been OSS in my last comment, sorry. In my opinion a wrong sampling rate would result in too low/high and too slow/fast sound, but not in white noise. Nevertheless I checked all available sampling rates (22.05, 44.1, 48) in the OSS output configuration of hydrogen, and get noisy sound all the time (as expected). My guess is still that we have some PPC endianness problem.
when you say OSS, I assume you are using the kernel's oss emulation drivers. What happens when you use alsa-oss useland oss emulation?
The OSS plugin was passing Little Endian data to OSS which was expecting Big Endian (Or vice versa...). I've added a patch that swaps the data and had it apply for ppc only.
