Thanks, Martin!
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Ruckert Martin
Sent: Friday, May 27, 2005 1:04 AM
To: MP3 encoders development list
Subject: Re: [mp3encoder] mp3 bit re-arranging
Hi!
Gene Williams wrote:
> I'm using the "part2_3_length" info to count bits, and I'm putting no
> filler between granules, which I think you confirmed is the correct
way
> to rebuild the frame. Thank you so much for that - that may greatly
> narrow the scope of my debugging! Just to confirm, are you saying the
> first bit of a frame's "main_data" is the only one that's guaranteed
to
> start on a byte boundary, regardless of the number of channels?
That is correct.
> As for the output bitrate, to keep things simple for now, I'm forming
> what I'm calling "clean frames" with a variable bitrate. The parts of
> each input frame are organized using a class, separating pieces of the
> side-info and concatenating the bits of each granule of main_data into
> single bitsets. The new side-info frames are then formed with
> main_data_begin equal to zero, and the bitrate of each frame is
> determined based on the size of the main_data. After the main_data
bits
> are laid down, zero bits are used to fill the required byte-count of
> that frame's bitrate. (After I achieve zero signal loss in the
output,
> I'll get rid of this inefficiency and start using main_data offsets
> again.) Before I had the headers falling into place correctly, my mp3
> player would not recognize the output as an mp3. I think this
variable
> bitrate method is working, because now the mp3 player has no problem
> playing the output. Please let me know if it sounds like I may be
> overlooking something.
This should be ok. variable bitrate is supported by allmost all players.
> Are these `filler` zero-bits what is known as "ancillary data"?
Thats exactly what it is.
Yours
Martin Ruckert
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