[MPlayer-users] DTS/AC3 pass through

[Ulion]

> With:
> aplay  -D spdif ~/dev/dts/Mina.wav
> DTS is passed through and the reciever says it's playing DTS
> (~/dev/dts/Mina.wav is a DTS source)
>
> mplayer -ao alsa:device=spdif -ac hwdts ~/dev/dts/Mina.wav
> gives:
> .....
> Audio file file format detected.
> ==========================================================================
> Forced audio codec: hwdts
> Opening audio decoder: [hwac3] AC3/DTS pass-through S/PDIF
> No accelerated IMDCT transform found
> hwac3: switched to AC3, 32000 bps, 48000 Hz
> a52: CRC check failed!
> AUDIO: 48000 Hz, 2 ch, ac3, 32.0 kbit/2.08% (ratio: 4000->192000)
> Selected audio codec: [hwdts] afm: hwac3 (DTS through S/PDIF)
> ==========================================================================
> AO: [alsa] 48000Hz 2ch ac3 (1 bytes per sample)
> Video: no video
> Starting playback...
> a52: CRC check failed!
> a52: CRC check failed!
> a52: CRC check failed!
> a52: CRC check failed!
> .....
>
> Mplayer DTS softdecode _does_ work with either ffmpeg or libdca thing,
> but then the reciever recieves it as normal signal and not DTS.
>
> mplayer version: dev-SVN-r23893-4.1.1 (yesterday)
>
> --
>	Paul Heldens.
>
> Accepting PGP/GPG encrypted mail.

current passthrough support for DTS is limited, it seems that only dts
audio in movie is supported.
the a52 warning above reported, mainly caused by the hwac3 filter not
identify dts stream correctly.
even the stream identity is correct, there would still has problem to
passthrough.

my patch for identify all kinds of dts stream, but it still can not passthrough.
http://lists.mplayerhq.hu/pipermail/mplayer-dev-eng/2007-August/053237.html

-- 
Ulion