[FFmpeg-devel] [RFC] avcodec: Add native DCA decoder based on libdcadec.

Hendrik Leppkes h.leppkes at gmail.com
Wed Jan 6 11:18:49 CET 2016

On Wed, Jan 6, 2016 at 4:01 AM, James Almer <jamrial at gmail.com> wrote:
> On 1/5/2016 11:51 PM, Michael Niedermayer wrote:
>> On Tue, Jan 05, 2016 at 11:44:04PM -0300, James Almer wrote:
>>> On 1/5/2016 11:35 PM, Michael Niedermayer wrote:
>>>> On Tue, Jan 05, 2016 at 11:27:25PM -0300, James Almer wrote:
>>>>> On 1/5/2016 11:21 PM, Michael Niedermayer wrote:
>> [...]
>>>>> Ideally, once this decoder is committed replacing the current one we'd replace
>>>>> the samples for the set available here: https://github.com/foo86/dcadec-samples
>>>> we can add new fate samples, we cannot replace fate samples
>>>> replacing would break previous checkouts and releases
>>>> not sure you actually meant to replace any ...
>>> Yeah, forgot about that. Kinda makes for a bloated fate suit in the long run...
>> this wouldnt happen if reference files where properly generated
>> that is with some reference decoder or taken from the input to a
>> reference encoder or from some referece test suite.
>> for subtitles or other where files are tiny that is a non issue though
>> ...
> Well, whoever made the xll test knew it would probably become obsolete at some
> point, since the decoder was not bitexact when the pcm reference was created.
> At least i assume that's why the test fails with this new bitexact decoder.

If its properly bitexact now, we can use a md5 test instead of needing
a reference sample, so that would safe us adding a new one.
It would be nice to add all the tests from the dcadec test suite later
to get more coverage, dca is slightly under-tested as it is.

- Hendrik

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