Tremor Ogg Vorbis audio decoder on LPC2148?

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1

Has anyone ever tried porting tremor to an LPC2148?

Tremor is a fixed-point implementation of the Ogg Vorbis decoding software.

Just out of curiosity I tried compiling the lowmem branch of tremor for the LPC2148. The resulting code is about 100 kB (just the decoder in 32-bit ARM-mode, no thumb). The tremor library provides a mechanism for targets that don’t have a stdio-like file interface, but it still needs a working malloc/calloc/realloc/free implementation. I don’t know yet how much memory it needs.

2

A colleague has tried this on a STR9 (96mips), the results are not good. Also quite a bit of ram is required.

We were using the Helix MP3 decoder before and playback was good, even at high bit rates.

Regards

sjo

3

I, too thought about trying that on an ARM. Since Spark Fun is stocking [this chip, I think I’ll be checking it out instead.](VLSI Solution-VS1000 - Ogg Vorbis Player System Circuit)

4

Cool, didn’t know there was a hardware solution available.