[FFmpeg-devel] [PATCH v2 00/16] Replace native DCA decoder with libdcadec based one

[Hendrik Leppkes]

On Fri, Jan 22, 2016 at 11:25 PM, Michael Niedermayer
<michael at niedermayer.cc> wrote:
> On Thu, Jan 21, 2016 at 09:44:06PM +0300, foo86 wrote:
>> Updated version of the patch. I choose to split it into even smaller commits to
>> make reviewing easier; you may prefer to squash it as needed.
>>
>> Changes since the first version:
>>
>> * Removed checkasm test for dcadsp
>> * Removed FATE test for dca-xll (didn't check if this works)
>> * Core decoder now uses butterflies_fixed() for sumdiff decoding
>> * avpriv_request_sample() is now used for reporting missing features
>> * Core decoder now stays in fixed point mode during intermittent XLL decoding errors
>> * X96 extension is no longer parsed (and left unused) when decoding XLL
>> * Minor code refactoring
>>
>> foo86 (16):
>>   avcodec/dca: remove old decoder
>>   avcodec/dca: remove unused assembly
>>   avcodec/dca: remove unused data
>>   tests/fate/audio: remove dca-xll test
>>   tests/checkasm: remove dcadsp test
>>   avcodec/dca: add REV1AUX sync word
>>   avcodec/dca: add more tables
>>   avcodec/dca: add math helpers and fixed point DCT
>>   avcodec/synth_filter: fix whitespace
>>   avcodec/synth_filter: add more filters
>>   avcodec/dca: add DSP implementation
>>   avcodec/dca: add generic defines
>>   avcodec/dca: add core decoder
>>   avcodec/dca: add EXSS parser
>>   avcodec/dca: add XLL decoder
>>   avcodec/dca: add new decoder based on libdcadec
>
> This breaks decoding https://trac.ffmpeg.org/raw-attachment/ticket/3550/WorstCase.wav
> didnt investgate what or why
>

That file seems rather funky. The dts parser outputs DTS frames of
16384 bytes, while the frame headers say 4097 bytes.
Seems like a parser problem to start with.