Re: Enable FFmpeg AC3 / DTS decoders

On 16/06/14 5:02 AM, Petri Hintukainen wrote:
> Hello,
>
> On su, 2014-06-08 at 20:38 -0400, Brad Smith wrote:
>> Here is a diff to enable the AC3 / DTS decoders via FFmpeg.
>>
>>
>> diff -r a974f181df3f src/combined/ffmpeg/xine_audio.list
>> --- a/src/combined/ffmpeg/xine_audio.list	Fri Jun 06 21:12:20 2014 +0200
>> +++ b/src/combined/ffmpeg/xine_audio.list	Sun Jun 08 20:03:38 2014 -0400
>> @@ -41,15 +41,16 @@
>>   WAVPACK			WAVPACK			WavPack
>>   AMR_NB			AMR_NB			AMR narrow band
>>   AMR_WB			AMR_WB			AMR wide band
>> +A52			AC3			AC-3
>>   EAC3			EAC3			E-AC-3
>>   AAC			AAC			MPEG4
>>   AAC_LATM		AAC_LATM		AAC LATM
>>   ADPCM_G726		ADPCM_G726		ADPCM G726
>>   QCLP			QCELP			QualComm Purevoice
>>   OPUS			OPUS			Opus Audio
>> +DTS			DTS			DTS
>>
>>   # disabled codecs (ref. configure.ac)
>> -!			AC3
>>   !			ADPCM_ADX
>>   !			ADPCM_G726
>>   !			DSICINAUDIO
>
> This also changes default decoders for AC3/DTS. Priority of ff_audio
> decoder is higher (7) than current libdts (1) / liba52 (5) decoders.
> Maybe we should also increase those priorities ?
>
> I don't know if AC3/DTS passthru works with ffmpeg decoder.
>
> Is there some advantage in preferring ffmpeg instead of liba52/libdts ?
> Downmixing support ? Maybe that could be moved to audio out so that all
> decoders could benefit from it :)

For our (OpenBSD) packages we consider it advantageous to reduce the
external dependencies.

IMO the FFmpeg decoders are also advantageous as they support for 
example the newer DTS formats like DTS-HD HRA / MA and are also
optimized for certain platforms using SIMD support.

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