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-Note these changes relate to Hannu's code and don't include the changes
-made outside of this for modularising the sound
-
-Changelog for version 3.8o
---------------------------
-
-Since 3.8h
-- Included support for OPL3-SA1 and SoftOSS
-
-Since 3.8
-- Fixed SNDCTL_DSP_GETOSPACE
-- Compatibility fixes for Linux 2.1.47
-
-Since 3.8-beta21
-- Fixed all known bugs (I think).
-
-Since 3.8-beta8
-- Lot of fixes to audio playback code in dmabuf.c
-
-Since 3.8-beta6
-- Fixed the famous Quake delay bug.
-
-Since 3.8-beta5
-- Fixed many bugs in audio playback.
-
-Since 3.8-beta4
-- Just minor changes.
-
-Since 3.8-beta1
-- Major rewrite of audio playback handling.
-- Added AWE32 support by Takashi Iwai (in ./lowlevel/).
-
-Since 3.7-beta#
-- Passing of ioctl() parameters between soundcard.c and other modules has been
-changed so that arg always points to kernel space.
-- Some bugfixes.
-
-Since 3.7-beta5
-- Disabled MIDI input with GUS PnP (Interwave). There seems to be constant
-stream of received 0x00 bytes when the MIDI receiver is enabled.
-
-Since 3.5
-- Changes almost everywhere.
-- Support for OPTi 82C924-based sound cards.
-
-Since 3.5.4-beta8
-- Fixed a bug in handling of non-fragment sized writes in 16 bit/stereo mode
- with GUS.
-- Limited minimum fragment size with some audio devices (GUS=512 and
- SB=32). These devices require more time to "recover" from processing
- of each fragment.
-
-Since 3.5.4-beta6/7
-- There seems to be problems in the OPTi 82C930 so cards based on this
- chip don't necessarily work yet. There are problems in detecting the
- MIDI interface. Also mixer volumes may be seriously wrong on some systems.
- You can safely use this driver version with C930 if it looks to work.
- However please don't complain if you have problems with it. C930 support
- should be fixed in future releases.
-- Got initialization of GUS PnP to work. With this version GUS PnP should
- work in GUS compatible mode after initialization using isapnptools.
-- Fixed a bug in handling of full duplex cards in write only mode. This has
- been causing "audio device opening" errors with RealAudio player.
-
-Since 3.5.4.beta5
-- Changes to OPTi 82C930 driver.
-- Major changes to the Soundscape driver. The driver requires now just one
- DMA channel. The extra audio/dsp device (the "Not functional" one) used
- for code download in the earlier versions has been eliminated. There is now
- just one /dev/dsp# device which is used both for code download and audio.
-
-Since 3.5.4.beta4
-- Minor changes.
-
-Since 3.5.4-beta2
-- Fixed silent playback with ESS 688/1688.
-- Got SB16 to work without the 16 bit DMA channel (only the 8 bit one
- is required for 8 and 16 bit modes).
-- Added the "lowlevel" subdirectory for additional low level drivers that
- are not part of USS core. See lowlevel/README for more info.
-- Included support for ACI mixer (by Markus Kuhn). ACI is a mixer used in
- miroPCM sound cards. See lowlevel/aci.readme for more info.
-- Support for Aztech Washington chipset (AZT2316 ASIC).
-
-Since 3.5.4-beta1
-- Reduced clicking with AD1848.
-- Support for OPTi 82C930. Only half duplex at this time. 16 bit playback
- is sometimes just white noise (occurs randomly).
-
-Since 3.5.2
-- Major changes to the SB/Jazz16/ESS driver (most parts rewritten).
- The most noticeable new feature is support for multiple SB cards at the same
- time.
-- Renamed sb16_midi.c to uart401.c. Also modified it to work also with
- other MPU401 UART compatible cards than SB16/ESS/Jazz.
-- Some changes which reduce clicking in audio playback.
-- Copying policy is now GPL.
-
-Since 3.5.1
-- TB Maui initialization support
-Since 3.5
-- Improved handling of playback underrun situations.
-
-Since 3.5-beta10
-- Bug fixing
-
-Since 3.5-beta9
-- Fixed for compatibility with Linux 1.3.70 and later.
-- Changed boot time passing of 16 bit DMA channel number to SB driver.
-
-Since 3.5-beta8
-- Minor changes
-
-Since 3.5-beta7
-- enhancements to configure program (by Jeff Tranter):
- - prompts are in same format as 1.3.x Linux kernel config program
- - on-line help for each question
- - fixed some compile warnings detected by gcc/g++ -Wall
- - minor grammatical changes to prompts
-
-Since 3.5-beta6
-- Fixed bugs in mmap() support.
-- Minor changes to Maui driver.
-
-Since 3.5-beta5
-- Fixed crash after recording with ESS688. It's generally a good
- idea to stop inbound DMA transfers before freeing the memory
- buffer.
-- Fixed handling of AD1845 codec (for example Shuttle Sound System).
-- Few other fixes.
-
-Since 3.5-beta4
-- Fixed bug in handling of uninitialized instruments with GUS.
-
-Since 3.5-beta3
-- Few changes which decrease popping at end/beginning of audio playback.
-
-Since 3.5-beta2
-- Removed MAD16+CS4231 hack made in previous version since it didn't
- help.
-- Fixed the above bug in proper way and in proper place. Many thanks
- to James Hightower.
-
-Since 3.5-beta1
-- Bug fixes.
-- Full duplex audio with MAD16+CS4231 may work now. The driver configures
- SB DMA of MAD16 so that it doesn't conflict with codec's DMA channels.
- The side effect is that all 8 bit DMA channels (0,1,3) are populated in
- duplex mode.
-
-Since 3.5-alpha9
-- Bug fixes (mostly in Jazz16 and ESS1688/688 supports).
-- Temporarily disabled recording with ESS1688/688 since it causes crash.
-- Changed audio buffer partitioning algorithm so that it selects
- smaller fragment size than earlier. This improves real time capabilities
- of the driver and makes recording to disk to work better. Unfortunately
- this change breaks some programs which assume that fragments cannot be
- shorter than 4096 bytes.
-
-Since 3.5-alpha8
-- Bug fixes
-
-Since 3.5-alpha7
-- Linux kernel compatible configuration (_EXPERIMENTAL_). Enable
- using command "cd /linux/drivers/sound;make script" and then
- just run kernel's make config normally.
-- Minor fixes to the SB support. Hopefully the driver works with
- all SB models now.
-- Added support for ESS ES1688 "AudioDrive" based cards.
-
-Since 3.5-alpha6
-- SB Pro and SB16 supports are no longer separately selectable options.
- Enabling SB enables them too.
-- Changed all #ifndef EXCLUDE_xx stuff to #ifdef CONFIG_xx. Modified
-configure to handle this.
-- Removed initialization messages from the
-modularized version. They can be enabled by using init_trace=1 in
-the insmod command line (insmod sound init_trace=1).
-- More AIX stuff.
-- Added support for synchronizing dsp/audio devices with /dev/sequencer.
-- mmap() support for dsp/audio devices.
-
-Since 3.5-alpha5
-- AIX port.
-- Changed some xxx_PATCH macros in soundcard.h to work with
- big endian machines.
-
-Since 3.5-alpha4
-- Removed the 'setfx' stuff from the version distributed with kernel
- sources. Running 'setfx' is required again.
-
-Since 3.5-alpha3
-- Moved stuff from the 'setfx' program to the AudioTrix Pro driver.
-
-Since 3.5-alpha2
-- Modifications to makefile and configure.c. Unnecessary sources
- are no longer compiled. Newly created local.h is also copied to
- /etc/soundconf. "make oldconfig" reads /etc/soundconf and produces
- new local.h which is compatible with current version of the driver.
-- Some fixes to the SB16 support.
-- Fixed random protection fault in gus_wave.c
-
-Since 3.5-alpha1
-- Modified to work with Linux-1.3.33 and later
-- Some minor changes
-
-Since 3.0.2
-- Support for CS4232 based PnP cards (AcerMagic S23 etc).
-- Full duplex support for some CS4231, CS4232 and AD1845 based cards
-(GUS MAX, AudioTrix Pro, AcerMagic S23 and many MAD16/Mozart cards
-having a codec mentioned above).
-- Almost fully rewritten loadable modules support.
-- Fixed some bugs.
-- Huge amount of testing (more testing is still required).
-- mmap() support (works with some cards). Requires much more testing.
-- Sample/patch/program loading for TB Maui/Tropez. No initialization
-since TB doesn't allow me to release that code.
-- Using CS4231 compatible codecs as timer for /dev/music.
-
-Since 3.0.1
-- Added allocation of I/O ports, DMA channels and interrupts
-to the initialization code. This may break modules support since
-the driver may not free some resources on unload. Should be fixed soon.
-
-Since 3.0
-- Some important bug fixes.
-- select() for /dev/dsp and /dev/audio (Linux only).
-(To use select() with read, you have to call read() to start
-the recording. Calling write() kills recording immediately so
-use select() carefully when you are writing a half duplex app.
-Full duplex mode is not implemented yet.) Select works also with
-/dev/sequencer and /dev/music. Maybe with /dev/midi## too.
-
-Since 3.0-beta2
-- Minor fixes.
-- Added Readme.cards
-
-Since 3.0-beta1
-- Minor fixes to the modules support.
-- Eliminated call to sb_free_irq() in ad1848.c
-- Rewritten MAD16&Mozart support (not tested with MAD16 Pro).
-- Fix to DMA initialization of PSS cards.
-- Some fixes to ad1848/cs42xx mixer support (GUS MAX, MSS, etc.)
-- Fixed some bugs in the PSS driver which caused I/O errors with
- the MSS mode (/dev/dsp).
-
-Since 3.0-950506
-- Recording with GUS MAX fixed. It works when the driver is configured
- to use two DMA channels with GUS MAX (16 bit ones recommended).
-
-Since 3.0-94xxxx
-- Too many changes
-
-Since 3.0-940818
-- Fixes for Linux 1.1.4x.
-- Disables Disney Sound System with SG NX Pro 16 (less noise).
-
-Since 2.90-2
-- Fixes to soundcard.h
-- Non blocking mode to /dev/sequencer
-- Experimental detection code for Ensoniq Soundscape.
-
-Since 2.90
-- Minor and major bug fixes
-
-Since pre-3.0-940712
-- GUS MAX support
-- Partially working MSS/WSS support (could work with some cards).
-- Hardware u-Law and A-Law support with AD1848/CS4248 and CS4231 codecs
- (GUS MAX, GUS16, WSS etc). Hardware ADPCM is possible with GUS16 and
- GUS MAX, but it doesn't work yet.
-Since pre-3.0-940426
-- AD1848/CS4248/CS4231 codec support (MSS, GUS MAX, Aztec, Orchid etc).
-This codec chip is used in various sound cards. This version is developed
-for the 16 bit daughtercard of GUS. It should work with other cards also
-if the following requirements are met:
- - The I/O, IRQ and DMA settings are jumper selectable or
- the card is initialized by booting DOS before booting Linux (etc.).
- - You add the IO, IRQ and DMA settings manually to the local.h.
- (Just define GUS16_BASE, GUS16_IRQ and GUS16_DMA). Note that
- the base address bust be the base address of the codec chip not the
- card itself. For the GUS16 these are the same but most MSS compatible
- cards have the codec located at card_base+4.
-- Some minor changes
-
-Since 2.5 (******* MAJOR REWRITE ***********)
-
-This version is based on v2.3. I have tried to maintain two versions
-together so that this one should have the same features than v2.5.
-Something may still be missing. If you notice such things, please let me
-know.
-
-The Readme.v30 contains more details.
-
-- /dev/midi## devices.
-- /dev/sequencer2
-
-Since 2.5-beta2
-- Some fine tuning to the GUS v3.7 mixer code.
-- Fixed speed limits for the plain SB (1.0 to 2.0).
-
-Since 2.5-beta
-- Fixed OPL-3 detection with SB. Caused problems with PAS16.
-- GUS v3.7 mixer support.
-
-Since 2.4
-- Mixer support for Sound Galaxy NX Pro (define __SGNXPRO__ on your local.h).
-- Fixed truncated sound on /dev/dsp when the device is closed.
-- Linear volume mode for GUS
-- Pitch bends larger than +/- 2 octaves.
-- MIDI recording for SB and SB Pro. (Untested).
-- Some other fixes.
-- SB16 MIDI and DSP drivers only initialized if SB16 actually installed.
-- Implemented better detection for OPL-3. This should be useful if you
- have an old SB Pro (the non-OPL-3 one) or a SB 2.0 clone which has a OPL-3.
-- SVR4.2 support by Ian Hartas. Initial ALPHA TEST version (untested).
-
-Since 2.3b
-- Fixed bug which made it impossible to make long recordings to disk.
- Recording was not restarted after a buffer overflow situation.
-- Limited mixer support for GUS.
-- Numerous improvements to the GUS driver by Andrew Robinson. Including
- some click removal etc.
-
-Since 2.3
-- Fixed some minor bugs in the SB16 driver.
-
-Since 2.2b
-- Full SB16 DSP support. 8/16 bit, mono/stereo
-- The SCO and FreeBSD versions should be in sync now. There are some
- problems with SB16 and GUS in the FreeBSD versions.
- The DMA buffer allocation of the SCO version has been polished but
- there could still be some problems. At least it hogs memory.
- The DMA channel
- configuration method used in the SCO/System is a hack.
-- Support for the MPU emulation of the SB16.
-- Some big arrays are now allocated boot time. This makes the BSS segment
- smaller which makes it possible to use the full driver with
- NetBSD. These arrays are not allocated if no suitable sound card is available.
-- Fixed a bug in the compute_and_set_volume in gus_wave.c
-- Fixed the too fast mono playback problem of SB Pro and PAS16.
-
-Since 2.2
-- Stereo recording for SB Pro. Somehow it was missing and nobody
- had noticed it earlier.
-- Minor polishing.
-- Interpreting of boot time arguments (sound=) for Linux.
-- Breakup of sb_dsp.c. Parts of the code has been moved to
- sb_mixer.c and sb_midi.c
-
-Since 2.1
-- Preliminary support for SB16.
- - The SB16 mixer is supported in its native mode.
- - Digitized voice capability up to 44.1 kHz/8 bit/mono
- (16 bit and stereo support coming in the next release).
-- Fixed some bugs in the digitized voice driver for PAS16.
-- Proper initialization of the SB emulation of latest PAS16 models.
-
-- Significantly improved /dev/dsp and /dev/audio support.
- - Now supports half duplex mode. It's now possible to record and
- playback without closing and reopening the device.
- - It's possible to use smaller buffers than earlier. There is a new
- ioctl(fd, SNDCTL_DSP_SUBDIVIDE, &n) where n should be 1, 2 or 4.
- This call instructs the driver to use smaller buffers. The default
- buffer size (0.5 to 1.0 seconds) is divided by n. Should be called
- immediately after opening the device.
-
-Since 2.0
-Just cosmetic changes.