[gstreamer-bugs] [Bug 550613] [mpegtsmux] Add support for ac3/dts/lpcm

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-plugins-bad | Ver: HEAD CVS




------- Comment #4 from vanista  2008-11-20 17:26 UTC -------
Created an attachment (id=123122)
 --> (http://bugzilla.gnome.org/attachment.cgi?id=123122&action=view)
Initial, basic support for extended audio

This patch simply enables muxing the extended audio formats. I don't have an
LPCM encoder yet so I've just tested AC3 using the following pipeline :

gst-launch-0.10 audiotestsrc num-buffers=100 ! ffenc_ac3 ! mpegtsmux !
mpegtsdemux ! ffdec_ac3 ! alsasink

Information about LPCM is very cryptic. I got my hands the AES3-2003 standard
and I've analyzed all the code I found related to LPCM handling (mpegpsdemux,
mpegtsdemux, dvdlpcmdec...), there are lots of inconsistencies between the spec
and the code. I believe LPCM packetized in PES has its own standard, and I
can't find anything official about it.

Also the mpegtsdemux (not sure if I should use it as reference), has raw LPCM
caps which provide all parameters needed to decode (as opposed to
audio/x-private1-lpcm which includes a header to be parsed by the decoder). If
this is accurate, then the PES must contain all parameters somehow, but I've
checked the code in the demux and there's no such special handling of the
stream.

I'll try to find a valid TS stream which contains LPCM to clarify this.


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