18 Aug
2004
18 Aug
'04
8:59 p.m.
Hello, I have been googleing around trying to find information on raw
pcm data. Does anybody know of any tutorials or references on raw pcm
data? I am most curious about different storage types (2s complement,
etc), and how multiple channels are stored. Thanks. -Garett
18 Aug
18 Aug
9:07 p.m.
On Wed, Aug 18, 2004 at 02:41:26PM -0600, Garett Shulman wrote:
Hello, I have been googleing around trying to find
information on raw
pcm data. Does anybody know of any tutorials or references on raw pcm
data? I am most curious about different storage types (2s complement,
etc), and how multiple channels are stored. Thanks. -Garett
A good place to start might be something like audacities powerful RAW file
loader. At least at one time it gave you all the options and let you see a
section of the waveform.
- Steve
19 Aug
19 Aug
1:59 p.m.
not big secrets here.
try to look up the docs for the WAV format.
or just search for big/little endian encoding
24bit packed words etc
in substance there are only a few mainstream raw pcm data encodings.
8bit , in some case signed, in others unsigned (amiga IIRC).
16bit signed (2 complement) (usually little endian, aka x86 endianess,
PPCs must swap da)
24bit usually signed (2 complement), little endian
32bit integer
32bit float (IEEE)
cheers,
Benno
http://www.linuxsampler.org
Garett Shulman wrote:
Hello, I have been googleing around trying to find
information on raw
pcm data. Does anybody know of any tutorials or references on raw pcm
data? I am most curious about different storage types (2s complement,
etc), and how multiple channels are stored. Thanks. -Garett
5:58 p.m.
I think it would be useful to set up a wiki page or something outlining
the different sound formats. Is there a lad-related wiki?
/* Quoth Benno Senoner <sbenno(a)gardena.net>
on Thu, 19 Aug 2004 at 17:49 +0200
in <4124CC0E.9030704(a)gardena.net> */
not big secrets here.
try to look up the docs for the WAV format.
or just search for big/little endian encoding
24bit packed words etc
in substance there are only a few mainstream raw pcm data encodings.
8bit , in some case signed, in others unsigned (amiga IIRC).
16bit signed (2 complement) (usually little endian, aka x86 endianess,
PPCs must swap da)
24bit usually signed (2 complement), little endian
32bit integer
32bit float (IEEE)
cheers,
Benno
http://www.linuxsampler.org
Garett Shulman wrote:
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Hello, I have been googleing around trying to find
information on raw
pcm data. Does anybody know of any tutorials or references on raw pcm
data? I am most curious about different storage types (2s complement,
etc), and how multiple channels are stored. Thanks. -Garett
7:37 p.m.
???????????? wrote:
> 8bit , in some case signed, in others unsigned
(amiga IIRC).
> 16bit signed (2 complement) (usually little endian, aka x86 endianess,
> PPCs must swap da)
> 24bit usually signed (2 complement), little endian
> 32bit integer
> 32bit float (IEEE)
libsndfile reads and writes raw (ie headerless) files of all of the
above formats and has the advantage of also reading WAV, AIFF, AU
and a whole bunch of other files as well.
http://www.mega-nerd.com/libsndfile/
Erik
--
+-----------------------------------------------------------+
Erik de Castro Lopo nospam(a)mega-nerd.com (Yes it's valid)
+-----------------------------------------------------------+
"If POSIX threads are a good thing, perhaps I don't want to know what
they're better than." -- Rob Pike
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days inactive
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linux-audio-dev@lists.linuxaudio.org
4 comments
5 participants
participants (5)
-
Benno Senoner -
Erik de Castro Lopo -
Garett Shulman -
Hans Fugal -
Steve Harris