Re: Book suggestions, docs etc...
Re: Book suggestions, docs etc...
- Subject: Re: Book suggestions, docs etc...
- From: William Stewart <email@hidden>
- Date: Wed, 8 Feb 2006 17:06:22 -0800
We wanted to provide a way to represent overview data in CAF files,
so that:
(1) Different Apps could share the same overview data
(2) We didn't have little overview files littering people's disks...
So, we defined an overview chunk type in CAF. The details of this are
covered in the CAF Document available on Apple's developer web site.
I would be interested in comments about those contents - if they are
suitable (or not).
Thanks
Bill
On 08/02/2006, at 3:14 PM, Mark Pauley wrote:
So it looks like they use min, max and root-mean-square but no
trickiness to speed up resizing when the buffer hasn't changed.
_Mark
On Feb 8, 2006, at 1:36 PM, Nick Haddad wrote:
You may want to check out the source code for Audacity (http://
audacity.sourceforge.net/) for an example of how they do waveform
drawing. Of course if you are creating code for commercial use be
careful how much code you borrow, as Audacity's creative common
license (http://creativecommons.org/licenses/by/2.0/) has some
restrictions.
Also for dsp you can check out musicdsp.org for a nice set of free
dsp algorithms.
-nick
On Feb 8, 2006, at 4:04 PM, Mark Pauley wrote:
I've done the waveform display thing, I like to interpolate by
taking the highest sample-value per pixel bin. Not perfect, but
it generally gives pretty good looking results.
I was thinking about some sort of heap-structure to optimize for
resizing of the display, any ideas on that front? Looking at
megs of samples is a drag when you're just trying to resize the
display.
For DSP intro's, I recommend the Electronic Music Tutorial by
Curtis Roads. It's a long read, but very thorough on a whole lot
of topics.
_Mark
On Feb 7, 2006, at 7:00 PM, email@hidden wrote:
Hi,
Can anyone suggest a book on CoreAudio or additional
documentation -- other than the official Apple stuff that I can
read up on? Also, does have any advice on general DSP books? I
need to read up on things like rendering waveforms as images
fast. It is really hard to write code to show a waveform in
1000 pixels when the source material is several megabytes.
There must be some standard industry books on routines and
examples on how to do that sort of thing? no? I am a long time
programmer, but really new to audio stuff, so I am kind of a
newbie.
Thanks.
John
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