Look at ffmpeg source code, there are at least 5 different ADPCM
implementations to choose from including the CCITT G.726.
>dbell wrote:
>
>> What I am looking for is the algorithm description including data
>> packing format for
>>
>> WAVE_FORMAT_MEDIASPACE_ADPCM (0x0012)
>
>All I can offer you is good luck as that is one of the many ADPCM
>algorithms I have never seen documentation or code for.
>
>However, if you have a PCM -> WAVE_FORMAT_MEDIASPACE_ADPCM encoder
>and a WAVE_FORMAT_MEDIASPACE_ADPCM -> PCM decoder then reverse
>engineering the decoder is usually pretty easy. I'd even offer to
>do it for you for a fee :-).
>
>Erik
>--
>-----------------------------------------------------------------
>Erik de Castro Lopo
>-----------------------------------------------------------------
>C++: The power, elegance and simplicity of a hand grenade.
>
Reply by Erik de Castro Lopo●October 30, 20072007-10-30
dbell wrote:
> What I am looking for is the algorithm description including data
> packing format for
>
> WAVE_FORMAT_MEDIASPACE_ADPCM (0x0012)
All I can offer you is good luck as that is one of the many ADPCM
algorithms I have never seen documentation or code for.
However, if you have a PCM -> WAVE_FORMAT_MEDIASPACE_ADPCM encoder
and a WAVE_FORMAT_MEDIASPACE_ADPCM -> PCM decoder then reverse
engineering the decoder is usually pretty easy. I'd even offer to
do it for you for a fee :-).
Erik
--
-----------------------------------------------------------------
Erik de Castro Lopo
-----------------------------------------------------------------
C++: The power, elegance and simplicity of a hand grenade.
Reply by dbell●October 29, 20072007-10-29
Hi Erik,
What I am looking for is the algorithm description including data
packing format for
WAVE_FORMAT_MEDIASPACE_ADPCM (0x0012)
Any guidance would be appreciated.
Thanks,
Dirk
On Oct 29, 6:11 pm, Erik de Castro Lopo <er...@mega-nerd.com> wrote:
> dbell wrote:
> > Hello Everybody,
>
> > Does anyone know where to find a detailed algorithm description for
> > Wav file compatible ADPCM?
>
> ADPCM is a class of algorithms, not a particular algorithm,
>
> There are at least 20 different ADPCM algorithms which can
> be used in a WAV file container. Which one in particular do
> you mean?
>
> Erik
> --
> -----------------------------------------------------------------
> Erik de Castro Lopo
> -----------------------------------------------------------------http://en.wikipedia.org/wiki/Why_I_Am_Not_a_Christianhttp://en.wikipedia.org/wiki/Why_I_Am_Not_a_Muslimhttp://en.wikipedia.org/wiki/Strong_atheism
Reply by Erik de Castro Lopo●October 29, 20072007-10-29
dbell wrote:
> Hello Everybody,
>
> Does anyone know where to find a detailed algorithm description for
> Wav file compatible ADPCM?