[FFmpeg-devel] [PATCH] fate: Convert the musepack8 test to an oneoff test

[Martin Storsjö]

On Thu, 12 Nov 2020, Andreas Rheinhardt wrote:

> Martin Storsjö:
>> This fixes tests if built for x86 with x87 FPU.
>> ---
>> This requires someone to upload a reference file.
>> ---
>>  tests/fate/mpc.mak | 4 +++-
>>  1 file changed, 3 insertions(+), 1 deletion(-)
>> 
>> diff --git a/tests/fate/mpc.mak b/tests/fate/mpc.mak
>> index bb1c03d250..cde6e55177 100644
>> --- a/tests/fate/mpc.mak
>> +++ b/tests/fate/mpc.mak
>> @@ -12,7 +12,9 @@ fate-musepack7: REF = $(SAMPLES)/musepack/inside-mp7.pcm
>>  FATE_MPC-$(call ALLYES, FILE_PROTOCOL MPC8_DEMUXER MPC8_DECODER  \
>>                          ARESAMPLE_FILTER PCM_S16LE_ENCODER  \
>>                          FRAMECRC_MUXER PIPE_PROTOCOL) += fate-musepack8
>> -fate-musepack8: CMD = framecrc -i $(TARGET_SAMPLES)/musepack/inside-mp8.mpc -ss 8.4 -af aresample -c:a pcm_s16le
>> +fate-musepack8: CMD = pcm -i $(TARGET_SAMPLES)/musepack/inside-mp8.mpc -ss 8.4 -af aresample
>> +fate-musepack8: CMP = oneoff
>> +fate-musepack8: REF = $(SAMPLES)/musepack/inside-mp8.pcm
>>
>>  FATE_SAMPLES_AVCONV += $(FATE_MPC-yes)
>>  fate-mpc: $(FATE_MPC-yes)
>> 
> To quote myself:
> "The test uses the framecrc output, because Musepack SV8 is an encoder
> that returns multiple frames for a single packet, so that timing
> information in the test output is valueable. Output seeking has been
> used in order to limit the size of the ref file as well as to test this
> codepath for the first time."
> The timing information would be lost with your patch; output seeking
> would only be implicitly tested (by looking at the first sample that is
> retained). And of course your ref file would be way bigger. So is there
> no better way?

Well one way would be to convert the floating point bits of the decoder to 
fixed point, or create some combination of pcm/oneoff + framecrc for 
timing info but without the actual crcs. Or build something like framecrc 
with actual output data instead of hashes, with a matching oneoff test 
tool to compare the outputs...

But as things are right now, any crc tests for anything involving floats 
(at least, anything that does more than one single trivial arithmetic 
operation on floats before storing them) are bound to break.

// Martin