[Openquicktime-devel] Audio Codecs Added to CVS

[Nicholas H. <nj...@ec...>]

I have just added support for 'twos', 'sowt', 'ulaw' and 'ima4' to 
CVS. They are all part of the new "Simple Audio" plugin.
I would have done 'raw ' as well but I don't have any movies encoded 
using raw and Quicktime 5 won't generate them. If you have a movie 
with raw encoding can you send it to me please.... ?

I have successfully streamed live audio with my broadcasting 
application "OQT Broadcaster". I have had it working with both the 
IMA4 and MP3 codecs... There should be a public release coming soon - 
and hopefully a stream for you to tune into: 
http://www.surgeradio.co.uk.


The following audio codecs could be supported. If you have any 
information/specs/LGPLed code for encoding/decoding them please let 
me know:

'alaw' A-Law 2:1
'MAC3' MAC 3:1 - 8-bit Only
'MAC3' MAC 6:1 - 8-bit Only
'dvi ' DVI IMA ADPCM 4:1
'dvca' Digital Video Audio
'lpc ' Linear Predictive Coding 23:1 (for voice)
'agsm' Apple GSM 10:1 (Actually just GSM 6.10)
+ Microsoft variations

These codecs could be supported fairly easily as well but I don't 
know if there is any point... ? As they are all higer quality than 
the format that OQT uses internally... ?

in24	24-bit Integer PCM
fl32	32-bit Floating Point PCM
in32	32-bit Integer PCM
fl64	64-bit Floating Point PCM



Another thought it maybe we should have a separate project under GPL 
(rather than LGPL) that we can create plugins in so we can use GPLed 
source code - ffmpeg etc... ?



-- 
Nicholas Humfrey

Undergraduate, BSc Computer Science
University of Southampton, UK
nj...@ec...
http://www.ecs.soton.ac.uk/~njh399/