19 Jul
2007
19 Jul
'07
3:53 a.m.
On Wed, 2007-07-18 at 14:55 -0700, Craig Hoedebeck wrote:
I am relatively new to audio programming, but I have a
task that
requires converting between various audio formats:
unsigned 16 bit linear to signed 16 bit linear
u_law to signed 16 bit linear
a_law to signed 16 bit linear
unsigned 8 bit linear to signed 16 bit
signed 8 bit linear to signed 16 bit
Anyone know what the conversion functions for these would look like?
Or even what a good reference is where I can find these? I have been
googling around for about an hour and I have come up empty.
For a_law an u_law you could try wikipedia, which will also give you a
nice link for further reading and implementation here:
http://hazelware.luggle.com/tutorials/mulawcompression.html
The linear conversions should be trivial, something like:
// unsigned 16 bit linear to signed 16 bit linear:
short s_16 = u_16 - 32758
// signed 8 bit linear to signed 16 bit
short s_16 = s_char << 8
// unsigned 8 bit linear to signed 16 bit
short s_16 = (u_char - 128) << 8
Mind you, i haven't had my coffee yet ...
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