[FFmpeg-devel] [PATCH] AMR-WB Decoder

Måns Rullgård mans
Sat Sep 18 14:21:56 CEST 2010

Benjamin Larsson <banan at ludd.ltu.se> writes:

> On 09/18/2010 12:15 PM, M?ns Rullg?rd wrote:
>> Rob <robert.swain at gmail.com> writes:
>>> On 18 September 2010 11:43, M?ns Rullg?rd <mans at mansr.com> wrote:
>>>> Marcelo Galv?o P?voa <marspeoplester at gmail.com> writes:
>>>>> Here is my floating point AMR-WB Decoder from GSoC. The output
>>>>> quality seems good compared to the reference and libopencore
>>>>> decoders.
>>>> Seems good?  Does it differ by more than +-1?
>>> http://lists.mplayerhq.hu/pipermail/ffmpeg-soc/2010-September/009964.html
>> Any difference of more than 1 from the reference needs to be understood.
> Celp codecs usually differ more cause of more steps where differences
> can propagate.

So rounding errors are amplified?  Sounds like a bad design to me.
However that may be, the cause discrepancies must still be understood,
though not necessarily removed.  If you can explain the differences,
that is good enough for me.  If you do not know where they come from,
there could be bugs hiding.

M?ns Rullg?rd
mans at mansr.com

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