Hi Mark,
My understanding is that sfront only produces the bitstream header
part of the MP4 format. When an MP4 is streamed, the bitstream
header (strictly, the "StructuredAudioSpecificConfig" element)
conceptually arrives all at the same time at the start of session.
So it doesn't matter what order SASL, SAOL, and samples come
in this block, since everything is arrived before the orchestra
startup begins (see Subclause 5.7.2).
saenc (the encoder bundled with saolc) currently, and I'm sure
sfront in the future, produces a full bitstream. In this case,
after the header is received, score events and MIDI events may
be encoded as streaming data. The score chunk encoded in the
bitstream header is *not* streaming score data, it is
preprocessed score data.
Is this distinction clear?
Best,
-- Eric
+-----------------+
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-----Original Message-----
From: Marek Claussen <m.claussen@tuhh.de>
To: saol-dev@media.mit.edu <saol-dev@media.mit.edu>
Cc: m.claussen@tuhh.de <m.claussen@tuhh.de>
Date: Tuesday, November 30, 1999 11:19 AM
Subject: sfront encoding-order
>hi !
>
>I´ve a short question about the way, sfront encodes the different blocks
>
>of an mp4-file stream.
>When encoding a file containing SAOL-, SASL-files, additional samples
>and a symbol-table, it turned out, that first we got the symbol-table
>followed by the SAOL-file, which looks OK to me.
>But then the SASL-file appears, which is surprising, because we need the
>
>samples first to build a complete orchestra.
>Also, when thinking of a streaming implementation, we would need the
>samples before(!) the score-events, which are read from the stream.
>Maybe someone knows how to handle this, or if it is still something on
>the todo-list.
>
>regards
>
>mareK
>
>%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> Internet: http://i.am/marek
> e-mailto:marek@bigfoot.de
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>
>
>
>
>
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