[FFmpeg-devel] BSAC Decoder Support ?

Alex Converse alex.converse
Tue Dec 8 08:37:21 CET 2009

On Tue, Dec 8, 2009 at 2:04 AM, Amar ajeet <amar.ajeet at gmail.com> wrote:
> Hi All,
> ? ? ? ?Do any one have Patch for BSAC decoder . Please give me details how
> can we implement the BSAC decoder .

AFAIK no one has a working BSAC patch for FFmpeg.

BSAC is an MPEG-4 "General Audio" coder (also called MPEG-4 TF coder).
That means it uses the same time-frequency model as MPEG-2/4 AAC but
uses a different entropy coding system and thus has a different
bitstream syntax and quantization scheme. Because of this a large
amount of code can be potentially leveraged between both decoders.
FFmpeg has a fast, high quality native AAC decoder already.

ISO/IEC 14496-3:2009 describes BSAC decoding. The (hopefully) soon to
be published ISO/IEC 14496-26 describes test procedures.

Presumably your interest in BSAC is for DVB/T-DMB. If it's for
something else I'm curious as to what.


Alex Converse

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