WAVE Data Format Data Packing Document

Hi,
I am looking for the link to the document where wave
audio data packing is explained.

For example, if I have encoded Data in GAM610, How do I
pack it so that Media Player can Play it.

thanks

 

If you mean you want to know the structure of a .wav file,
it's very easy: it's a 'RIFF' file of type 'WAVE' which
contains a WAVEFORMATEX in the header and the audio stream
in the 'data' chunk. You can get the details from
www.wotsit.org.



--

/**
* Alessandro Angeli
*
* MVP:igitalMedia
*
* a dot angeli at biosys dot net
*/

 

Thanks
I am not sure, but the Data Looks to be OLD as there are
more Registered WAVE Format codecs.

 

I can't follow you. The codecs' format tags have nothing to
do with the WAVE file structure. A WAVE is just a container
for whatever audio data you want to put in there as long as
you provide a correct header and you have a suitable
software to decode it (for example an ACM codec or a
DirectShow filter or a DMO or a custom decoder...).

--

/**
* Alessandro Angeli
*
* MVP:igitalMedia
*
* a dot angeli at biosys dot net
*/

 

Each coder takes raw audio data and encodes it. After
encoding it need to pack the data. For example, ADPCM
takes one audio sample and converts into a 5/4/3/2 bit
sample depending upon the output rate. These bits needs
to be packed to make a audio file. After packing we put
the WAVE Header.

What I was saying was that document has packing format
for few coders only, where as Media Player codec tag file
as lot more coders.

 

The document on www.wotsit.org only describes the RIFF/WAVE
file format (the system stream) and, as an example, the data
format for LPCM audio. The data format is not an inherent
part of the file structure and can actually be any arbitrary
binary data stream stored in the 'data' chunk(s). For each
data format, you need the specifications of that particular
format if you want to understand it. Some can be found and
are more or less publicly available, others are strictly
proprietary. On Windows, anyway, you have 3 system
registries of codecs (ACM, DirectShow filters, DMOs) that
can handle the various formats. Unless you want to
understand the data yourself, you can query those registries
using the informations in the WAVEFORMATEX header to find a
codec that can handle that data and provide you with a
canonical representation of it (usually LPCM).

--

/**
* Alessandro Angeli
*
* MVP:igitalMedia
*
* a dot angeli at biosys dot net
*/