Tremor

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(Texas Instruments TMS320C55x DSP Family)
(Texas Instruments TMS320C55x DSP Family: dead link)
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See the [http://lists.xiph.org/pipermail/tremor/2004-October/001114.html mailing list entry]
See the [http://lists.xiph.org/pipermail/tremor/2004-October/001114.html mailing list entry]
* Johannes Sandvall's performance improvements
* Johannes Sandvall's performance improvements
-
See the [http://lists.xiph.org/pipermail/tremor/2004-March/000957.html mailing list entry] or just [http://www.sandvall.nu/patch download]
+
See the [http://lists.xiph.org/pipermail/tremor/2004-March/000957.html mailing list entry]
* alloca removal
* alloca removal
The TI compiler does not support this.
The TI compiler does not support this.

Revision as of 04:28, 16 March 2010

Tremor is a fixed-point version of the Ogg Vorbis decoder for those platforms that can't do floating point math.

Contents

Platforms

ARM/Coldfire/MIPS CPUs

You will probably want to use the Tremor main branch. You can check it out here:

svn co http://svn.xiph.org/trunk/Tremor/

It contains some optimizations for ARM and the overall lowest computational complexity. It should run on most devices with a few hundred KB of codec RAM.

Texas Instruments TMS320C55x DSP Family

Download the generic lowmem source using Subversion. This is probably the version you want to start working with for a DSP, but may be slower on normal CPUs.

svn co http://svn.xiph.org/branches/lowmem-branch/Tremor/

There is also a no-byte branch for platforms whose smallest data unit is larger than 8 bits.

Required / Suggested Changes to the code as downloaded:

  • Roland Wintersteller's various fixes

See the mailing list entry

  • Johannes Sandvall's performance improvements

See the mailing list entry

  • alloca removal

The TI compiler does not support this.

  • misc compiler warning fixes
  • hooks to TI DSPLIB functions cfft3216_NOSCALE and cbrev32

These are part of the TI DSPLIB which can be downloaded from the TI website.

Links

Retrieved from "http://wiki.xiph.org/Tremor"
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