Vorbis Multimedia IOProc for OS/2 - 0.3.2

MMIOVorbis 0.3.2 is an MMIOProc for OS/2 that allows OS/2’s multimedia system to play Ogg Vorbis files.

This IOProc supports translated read, traslated seek, and translated write operations.

Ogg Vorbis decoding is done by libvorbis.

Included is a example program called bitrate that prints the bitrate of an Ogg Vorbis file. Also an encoder called convert that converts any MMOS/2 readable file into an Ogg Vorbis file.

Download

MMIOVorbis is part of the MMAudio Pak When installing MMAudio Pak you can select which IOProcs to install.

Requirements

MMIOVorbis requires the EMX runtime.

Bugs and Known Issues

MMIOVorbis does not support Ogg Vorbii that change audio parameters, such as sample rate and number of channels, in the middle of the data.

To Do

• If requested I would consider adding support for untranslated Vorbii access.
• The Ogg must be separated from the Vorbis. Ogg is a container format, like RIFF, and MMOS/2’s compound file format support should be used here. This separation would allow MMOS/2 to support the Ogg FLAC format.
• Decode using Tremor instead of libVorbis.

Changes

• Changes from 0.3.1 to 0.3.2 (2003-08-31)
  • Encoder can encode 8 bit and mono files.
• Changes from 0.3 to 0.3.1 (2003-02-23)
  • Encoder now uses provided bitrates.
  • Replaced how bitrate queries are made.
• Changes from 0.2 to 0.3 (2002-08-28)
  • Added uninstaller.
  • Added limited use-at-own-risk Ogg Vorbis encoder.
  • Updated from 1.0rc2 ogg and vorbis libraries to 1.0.
• Changes from 0.1.1 to 0.2 (2002-02-14)
  • Skips errors in Ogg Vorbii files instead of halting.
  • Removed Ogg Vorbii encoding code that never worked anyway.
• Changes from 0.1 to 0.1.1 (2002-01-10)
  • Install now automatically associates OGG extension with Digital Audio.

Programming with mmioVorbis

Vorbis encoding is done with libvorbisenc. libvorbisenc requires quite a large amount of stack space to operate, so be sure to give it adequte stack space when compiling a program that uses mmioVorbis. If you are going to run the encoder in a separate thread, then be sure that you use DosCreateThread with adequate stack space:

DosCreateThread(&tidX,
                (PFNTHREAD)xtest,
                0U,
                CREATE_READY | STACK_COMMITED,
                65536);  // 1048576

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