1Note these changes relate to Hannu's code and don't include the changes
   2made outside of this for modularising the sound
   4Changelog for version 3.8o
   7Since 3.8h
   8- Included support for OPL3-SA1 and SoftOSS
  10Since 3.8
  12- Compatibility fixes for Linux 2.1.47
  14Since 3.8-beta21
  15- Fixed all known bugs (I think).
  17Since 3.8-beta8
  18- Lot of fixes to audio playback code in dmabuf.c
  20Since 3.8-beta6
  21- Fixed the famous Quake delay bug.
  23Since 3.8-beta5
  24- Fixed many bugs in audio playback.
  26Since 3.8-beta4
  27- Just minor changes.
  29Since 3.8-beta1
  30- Major rewrite of audio playback handling.
  31- Added AWE32 support by Takashi Iwai (in ./lowlevel/).
  33Since 3.7-beta#
  34- Passing of ioctl() parameters between soundcard.c and other modules has been
  35changed so that arg always points to kernel space.
  36- Some bugfixes.
  38Since 3.7-beta5
  39- Disabled MIDI input with GUS PnP (Interwave). There seems to be constant
  40stream of received 0x00 bytes when the MIDI receiver is enabled.
  42Since 3.5
  43- Changes almost everywhere.
  44- Support for OPTi 82C924-based sound cards.
  46Since 3.5.4-beta8
  47- Fixed a bug in handling of non-fragment sized writes in 16 bit/stereo mode
  48  with GUS.
  49- Limited minimum fragment size with some audio devices (GUS=512 and
  50  SB=32). These devices require more time to "recover" from processing
  51  of each fragment. 
  53Since 3.5.4-beta6/7
  54- There seems to be problems in the OPTi 82C930 so cards based on this
  55  chip don't necessarily work yet. There are problems in detecting the 
  56  MIDI interface. Also mixer volumes may be seriously wrong on some systems.
  57  You can safely use this driver version with C930 if it looks to work.
  58  However please don't complain if you have problems with it. C930 support
  59  should be fixed in future releases.
  60- Got initialization of GUS PnP to work. With this version GUS PnP should
  61  work in GUS compatible mode after initialization using isapnptools.
  62- Fixed a bug in handling of full duplex cards in write only mode. This has
  63  been causing "audio device opening" errors with RealAudio player.
  65Since 3.5.4.beta5
  66- Changes to OPTi 82C930 driver.
  67- Major changes to the Soundscape driver. The driver requires now just one
  68  DMA channel. The extra audio/dsp device (the "Not functional" one) used
  69  for code download in the earlier versions has been eliminated. There is now
  70  just one /dev/dsp# device which is used both for code download and audio.
  72Since 3.5.4.beta4
  73- Minor changes.
  75Since 3.5.4-beta2
  76- Fixed silent playback with ESS 688/1688.
  77- Got SB16 to work without the 16 bit DMA channel (only the 8 bit one
  78  is required for 8 and 16 bit modes).
  79- Added the "lowlevel" subdirectory for additional low level drivers that
  80  are not part of USS core. See lowlevel/README for more info.
  81- Included support for ACI mixer (by Markus Kuhn). ACI is a mixer used in
  82  miroPCM sound cards. See lowlevel/aci.readme for more info.
  83- Support for Aztech Washington chipset (AZT2316 ASIC).
  85Since 3.5.4-beta1
  86- Reduced clicking with AD1848.
  87- Support for OPTi 82C930. Only half duplex at this time. 16 bit playback
  88  is sometimes just white noise (occurs randomly).
  90Since 3.5.2
  91- Major changes to the SB/Jazz16/ESS driver (most parts rewritten).
  92  The most noticeable new feature is support for multiple SB cards at the same
  93  time.
  94- Renamed sb16_midi.c to uart401.c. Also modified it to work also with
  95  other MPU401 UART compatible cards than SB16/ESS/Jazz.
  96- Some changes which reduce clicking in audio playback.
  97- Copying policy is now GPL.
  99Since 3.5.1
 100- TB Maui initialization support
 101Since 3.5
 102- Improved handling of playback underrun situations.
 104Since 3.5-beta10
 105- Bug fixing
 107Since 3.5-beta9
 108- Fixed for compatibility with Linux 1.3.70 and later.
 109- Changed boot time passing of 16 bit DMA channel number to SB driver.
 111Since 3.5-beta8
 112- Minor changes
 114Since 3.5-beta7
 115- enhancements to configure program (by Jeff Tranter):
 116  - prompts are in same format as 1.3.x Linux kernel config program
 117  - on-line help for each question
 118  - fixed some compile warnings detected by gcc/g++ -Wall
 119  - minor grammatical changes to prompts
 121Since 3.5-beta6
 122- Fixed bugs in mmap() support.
 123- Minor changes to Maui driver.
 125Since 3.5-beta5
 126- Fixed crash after recording with ESS688. It's generally a good
 127  idea to stop inbound DMA transfers before freeing the memory
 128  buffer. 
 129- Fixed handling of AD1845 codec (for example Shuttle Sound System).
 130- Few other fixes.
 132Since 3.5-beta4
 133- Fixed bug in handling of uninitialized instruments with GUS.
 135Since 3.5-beta3
 136- Few changes which decrease popping at end/beginning of audio playback.
 138Since 3.5-beta2
 139- Removed MAD16+CS4231 hack made in previous version since it didn't
 140  help.
 141- Fixed the above bug in proper way and in proper place. Many thanks
 142  to James Hightower.
 144Since 3.5-beta1
 145- Bug fixes.
 146- Full duplex audio with MAD16+CS4231 may work now. The driver configures
 147  SB DMA of MAD16 so that it doesn't conflict with codec's DMA channels.
 148  The side effect is that all 8 bit DMA channels (0,1,3) are populated in 
 149  duplex mode.
 151Since 3.5-alpha9
 152- Bug fixes (mostly in Jazz16 and ESS1688/688 supports).
 153- Temporarily disabled recording with ESS1688/688 since it causes crash.
 154- Changed audio buffer partitioning algorithm so that it selects
 155  smaller fragment size than earlier. This improves real time capabilities
 156  of the driver and makes recording to disk to work better. Unfortunately
 157  this change breaks some programs which assume that fragments cannot be
 158  shorter than 4096 bytes.
 160Since 3.5-alpha8
 161- Bug fixes
 163Since 3.5-alpha7
 164- Linux kernel compatible configuration (_EXPERIMENTAL_). Enable
 165  using command "cd /linux/drivers/sound;make script" and then
 166  just run kernel's make config normally.
 167- Minor fixes to the SB support. Hopefully the driver works with
 168  all SB models now.
 169- Added support for ESS ES1688 "AudioDrive" based cards.
 171Since 3.5-alpha6
 172- SB Pro and SB16 supports are no longer separately selectable options.
 173  Enabling SB enables them too.
 174- Changed all #ifndef EXCLUDE_xx stuff to #ifdef CONFIG_xx. Modified
 175configure to handle this. 
 176- Removed initialization messages from the
 177modularized version. They can be enabled by using init_trace=1 in
 178the insmod command line (insmod sound init_trace=1).
 179- More AIX stuff.
 180- Added support for synchronizing dsp/audio devices with /dev/sequencer.
 181- mmap() support for dsp/audio devices.
 183Since 3.5-alpha5
 184- AIX port.
 185- Changed some xxx_PATCH macros in soundcard.h to work with
 186  big endian machines.
 188Since 3.5-alpha4
 189- Removed the 'setfx' stuff from the version distributed with kernel
 190  sources. Running 'setfx' is required again.
 192Since 3.5-alpha3
 193- Moved stuff from the 'setfx' program to the AudioTrix Pro driver.
 195Since 3.5-alpha2
 196- Modifications to makefile and configure.c. Unnecessary sources
 197  are no longer compiled. Newly created local.h is also copied to
 198  /etc/soundconf. "make oldconfig" reads /etc/soundconf and produces
 199  new local.h which is compatible with current version of the driver.
 200- Some fixes to the SB16 support.
 201- Fixed random protection fault in gus_wave.c
 203Since 3.5-alpha1
 204- Modified to work with Linux-1.3.33 and later
 205- Some minor changes
 207Since 3.0.2
 208- Support for CS4232 based PnP cards (AcerMagic S23 etc).
 209- Full duplex support for some CS4231, CS4232 and AD1845 based cards
 210(GUS MAX, AudioTrix Pro, AcerMagic S23 and many MAD16/Mozart cards
 211having a codec mentioned above).
 212- Almost fully rewritten loadable modules support.
 213- Fixed some bugs.
 214- Huge amount of testing (more testing is still required).
 215- mmap() support (works with some cards). Requires much more testing.
 216- Sample/patch/program loading for TB Maui/Tropez. No initialization
 217since TB doesn't allow me to release that code.
 218- Using CS4231 compatible codecs as timer for /dev/music.
 220Since 3.0.1
 221- Added allocation of I/O ports, DMA channels and interrupts
 222to the initialization code. This may break modules support since
 223the driver may not free some resources on unload. Should be fixed soon.
 225Since 3.0
 226- Some important bug fixes. 
 227- select() for /dev/dsp and /dev/audio (Linux only).
 228(To use select() with read, you have to call read() to start
 229the recording. Calling write() kills recording immediately so
 230use select() carefully when you are writing a half duplex app.
 231Full duplex mode is not implemented yet.) Select works also with
 232/dev/sequencer and /dev/music. Maybe with /dev/midi## too.
 234Since 3.0-beta2
 235- Minor fixes.
 236- Added
 238Since 3.0-beta1
 239- Minor fixes to the modules support.
 240- Eliminated call to sb_free_irq() in ad1848.c
 241- Rewritten MAD16&Mozart support (not tested with MAD16 Pro).
 242- Fix to DMA initialization of PSS cards.
 243- Some fixes to ad1848/cs42xx mixer support (GUS MAX, MSS, etc.)
 244- Fixed some bugs in the PSS driver which caused I/O errors with
 245  the MSS mode (/dev/dsp).
 247Since 3.0-950506
 248- Recording with GUS MAX fixed. It works when the driver is configured
 249  to use two DMA channels with GUS MAX (16 bit ones recommended).
 251Since 3.0-94xxxx
 252- Too many changes
 254Since 3.0-940818
 255- Fixes for Linux 1.1.4x.
 256- Disables Disney Sound System with SG NX Pro 16 (less noise).
 258Since 2.90-2
 259- Fixes to soundcard.h
 260- Non blocking mode to /dev/sequencer
 261- Experimental detection code for Ensoniq Soundscape.
 263Since 2.90
 264- Minor and major bug fixes
 266Since pre-3.0-940712
 267- GUS MAX support
 268- Partially working MSS/WSS support (could work with some cards).
 269- Hardware u-Law and A-Law support with AD1848/CS4248 and CS4231 codecs
 270  (GUS MAX, GUS16, WSS etc). Hardware ADPCM is possible with GUS16 and
 271  GUS MAX, but it doesn't work yet.
 272Since pre-3.0-940426
 273- AD1848/CS4248/CS4231 codec support (MSS, GUS MAX, Aztec, Orchid etc).
 274This codec chip is used in various sound cards. This version is developed
 275for the 16 bit daughtercard of GUS. It should work with other cards also
 276if the following requirements are met:
 277        - The I/O, IRQ and DMA settings are jumper selectable or
 278        the card is initialized by booting DOS before booting Linux (etc.).
 279        - You add the IO, IRQ and DMA settings manually to the local.h.
 280          (Just define GUS16_BASE, GUS16_IRQ and GUS16_DMA). Note that
 281        the base address bust be the base address of the codec chip not the
 282        card itself. For the GUS16 these are the same but most MSS compatible
 283        cards have the codec located at card_base+4.
 284- Some minor changes
 286Since 2.5 (******* MAJOR REWRITE ***********)
 288This version is based on v2.3. I have tried to maintain two versions
 289together so that this one should have the same features than v2.5.
 290Something may still be missing. If you notice such things, please let me
 293The Readme.v30 contains more details.
 295- /dev/midi## devices.
 296- /dev/sequencer2
 298Since 2.5-beta2
 299- Some fine tuning to the GUS v3.7 mixer code.
 300- Fixed speed limits for the plain SB (1.0 to 2.0).
 302Since 2.5-beta
 303- Fixed OPL-3 detection with SB. Caused problems with PAS16.
 304- GUS v3.7 mixer support.
 306Since 2.4
 307- Mixer support for Sound Galaxy NX Pro (define __SGNXPRO__ on your local.h).
 308- Fixed truncated sound on /dev/dsp when the device is closed.
 309- Linear volume mode for GUS
 310- Pitch bends larger than +/- 2 octaves.
 311- MIDI recording for SB and SB Pro. (Untested).
 312- Some other fixes.
 313- SB16 MIDI and DSP drivers only initialized if SB16 actually installed.
 314- Implemented better detection for OPL-3. This should be useful if you
 315  have an old SB Pro (the non-OPL-3 one) or a SB 2.0 clone which has a OPL-3.
 316- SVR4.2 support by Ian Hartas. Initial ALPHA TEST version (untested).
 318Since 2.3b
 319- Fixed bug which made it impossible to make long recordings to disk.
 320  Recording was not restarted after a buffer overflow situation.
 321- Limited mixer support for GUS.
 322- Numerous improvements to the GUS driver by Andrew Robinson. Including
 323  some click removal etc.
 325Since 2.3
 326- Fixed some minor bugs in the SB16 driver.
 328Since 2.2b
 329- Full SB16 DSP support. 8/16 bit, mono/stereo
 330- The SCO and FreeBSD versions should be in sync now. There are some
 331  problems with SB16 and GUS in the FreeBSD versions.
 332  The DMA buffer allocation of the SCO version has been polished but
 333  there could still be some problems. At least it hogs memory.
 334  The DMA channel
 335  configuration method used in the SCO/System is a hack.
 336- Support for the MPU emulation of the SB16.
 337- Some big arrays are now allocated boot time. This makes the BSS segment
 338  smaller which makes it possible to use the full driver with
 339  NetBSD. These arrays are not allocated if no suitable sound card is available.
 340- Fixed a bug in the compute_and_set_volume in gus_wave.c
 341- Fixed the too fast mono playback problem of SB Pro and PAS16.
 343Since 2.2
 344- Stereo recording for SB Pro. Somehow it was missing and nobody
 345  had noticed it earlier.
 346- Minor polishing.
 347- Interpreting of boot time arguments (sound=) for Linux.
 348- Breakup of sb_dsp.c. Parts of the code has been moved to
 349  sb_mixer.c and sb_midi.c
 351Since 2.1
 352- Preliminary support for SB16. 
 353  - The SB16 mixer is supported in its native mode.
 354  - Digitized voice capability up to 44.1 kHz/8 bit/mono
 355    (16 bit and stereo support coming in the next release).
 356- Fixed some bugs in the digitized voice driver for PAS16.
 357- Proper initialization of the SB emulation of latest PAS16 models.
 359- Significantly improved /dev/dsp and /dev/audio support.
 360  - Now supports half duplex mode. It's now possible to record and
 361    playback without closing and reopening the device.
 362  - It's possible to use smaller buffers than earlier. There is a new
 363    ioctl(fd, SNDCTL_DSP_SUBDIVIDE, &n) where n should be 1, 2 or 4.
 364    This call instructs the driver to use smaller buffers. The default
 365    buffer size (0.5 to 1.0 seconds) is divided by n. Should be called
 366    immediately after opening the device.
 368Since 2.0
 369Just cosmetic changes. 
 370 kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.