[M4IF Technotes] Is standard conform to put mp3 sound in aMPE
G-4 stream ?
Dokic, Miroslav
miroslav.dokic cirrus.com
Tue Sep 3 19:21:40 EDT 2002
Olivier and others,
The frame() bitstream element is a fully decodable element and
the decoder
does not need any information out-of-band.
In some cases it will make a decoder job easier if there was some
out-of-band info available
(like knowing sampling frequency ahead of time and set up and
lock PLL before the actual
data arrive).
In any case Layers I, II and III in both 11172-3 and 13818-3
could be discriminated
based on the in-band data (including 1/2 fs as well as
multichannel option).
Regards,
Miroslav
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Miroslav Dokic, Ph.D.
> Director, Advanced Technology Development
> Cirrus Logic, Inc.
> 4210 S. Industrial Dr., Austin, TX, 78744, USA
> tel. 1 (512) 912-3053
> fax. 1 (512) 445-0857
> www.crystal.com
> www.cirrus.com
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-----Original Message-----
From: AVARO Olivier FTRD/DIH/REN
[mailto:olivier.avaro rd.francetelecom.com]
Sent: Tuesday, September 03, 2023 3:46 PM
To: DaveMackie
Cc: Dave Singer; Remigijus; technotes lists.m4if.org
Subject: RE: [M4IF Technotes] Is standard conform to put mp3
sound in
aMPEG-4 stream ?
Seems that this solves the issue :
- streamtype shall be 0x05 (this is an AudiioStream)
- objecttype shall be 0x6B (this is Audio ISO/IEC 11172-3 MPEG-1
Audio)
- decoderspecficinfo : empty
- access units in this case are the frame() bitstream element as
is
defined in ISO/IEC 11172-3.
Just if someone knowledgeable on ISO/IEC 11172-3 can confirm that
the
signaling of possible P&L are done in-band ... Anybody ?
Kind regards,
Olivier
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