2 Oct
2005
2 Oct
'05
8:01 a.m.
Hi.
My little time-compressing audio player yatm currently supports 3 different
audio formats, ogg and speex via the xiph libraries, and mpeg via libmad.
I currently just blindly try to launch the decoder for either ogg, speex or
mp3 in series. SO if the first fails, I try the second, and so on. Which
kinda works but is a bit ugly. I'd like to add flac support at some point,
which would make this even more ugly.
Additionally, libsndfile support wouldnt be that bad either, so, I am
wondering, is there a reliable way to detect a audio streams file
format just given some bits of the header? So that I could set the
appropriate decoder algorithm based on that analysis? Or is
there actually a library one step higher level than libsndfile which
does generic audioformat to PCM? I guess not...
--
CYa,
Mario
2 Oct
2 Oct
9:22 a.m.
I currently just blindly try to launch the decoder for
either ogg, speex or
mp3 in series. I'd like to add flac...
a simple way - how about assuming files are properly named, eg theres no files matching
*.ogg which are actually .wav format? although in the major web browsers a .gif saved with
.jpg extension always loads without error..maybe good to check how xmms or similar handles
this situation..
wondering, is there a reliable way to detect a audio
streams file
format just given some bits of the header? So that I could set the
InfoAudio ( ftp://ftp.tsp.ece.mcgill.ca//pub/AFsp/AFsp-v8r1.tar.gz ) is quite useful
mainly for all the differing .wav bitrates/formats/endiannesses but maybe libsndfile
already takes care of that.. for a mp3 it just says "AFfindType - Unsupported audio
file type: MPEG-1 Layer III". and it doesnt even provide that much info for ogg or
FLAC.. i still like it though
it would be great if there was truly one solution to this, on Mac you just use coreaudio
API, on windows, you use ACM codec, but it seems each linux app has to independently
support and depend on flac/ogg/speex/wav/etc libs, ad nauseum..
c
3 Oct
3 Oct
4:22 a.m.
carmen <ix(a)replic.net> writes:
Sorry, but this kind of behaviour is way too microsoftian for
me. File extensions lie! :-) Besides, yatm should ideally be
able to stream data at some point in the future, and streams
can be named anything sometimes.
Yes, a
mega-libsndfile would be very cute.
--
CYa,
Mario
I currently
just blindly try to launch the decoder for either ogg, speex or
mp3 in series. I'd like to add flac...
a simple way - how about assuming files are properly named, eg theres no
files matching *.ogg which are actually .wav format? although in the major web browsers a .gif saved with
.jpg extension
always loads without error..maybe good to check how xmms or similar
handles this situation..
Yes, I'll look into other audio players sources...
wondering, is
there a reliable way to detect a audio streams file
format just given some bits of the header? So that I could set the
InfoAudio ( ftp://ftp.tsp.ece.mcgill.ca//pub/AFsp/AFsp-v8r1.tar.gz ) is quite useful
mainly for all the differing .wav bitrates/formats/endiannesses but maybe libsndfile
already takes care of that.. for a mp3 it just says "AFfindType - Unsupported audio
file type: MPEG-1 Layer III". and it doesnt even provide that much info for ogg or
FLAC.. i still like it though
it would be great if there was truly one solution to this, on Mac you just use coreaudio
API, on windows, you use ACM codec, but it seems each linux app has to independently
support and depend on flac/ogg/speex/wav/etc libs, ad nauseum.. 
9:19 a.m.
carmen wrote:
No, but Ogg is a container format and may contain audio data encoded as
Vorbis, Speex or Flac.
I currently
just blindly try to launch the decoder for either ogg, speex or
mp3 in series. I'd like to add flac...
a simple way - how about assuming files are properly named, eg theres no files
matching *.ogg which are actually .wav format? it would be great if there was truly one solution to
this, on Mac you just
use coreaudio API, on windows, you use ACM codec, but it seems each linux
app has to independently support and depend on flac/ogg/speex/wav/etc libs,
ad nauseum..
Yes, thats braindamaged. However, libsndfile now supports FLAC and work
on Ogg Vorbis and Ogg Speex is underway.
Erik
--
+-----------------------------------------------------------+
Erik de Castro Lopo
+-----------------------------------------------------------+
Linux, the UNIX defragmentation tool.
2 Oct
2 Oct
1:59 p.m.
Hallo,
Mario Lang hat gesagt: // Mario Lang wrote:
My little time-compressing audio player yatm currently
supports 3 different
audio formats, ogg and speex via the xiph libraries, and mpeg via libmad.
I currently just blindly try to launch the decoder for either ogg, speex or
mp3 in series. SO if the first fails, I try the second, and so on. Which
kinda works but is a bit ugly. I'd like to add flac support at some point,
which would make this even more ugly.
Additionally, libsndfile support wouldnt be that bad either, so, I am
wondering, is there a reliable way to detect a audio streams file
format just given some bits of the header?
The "file" command can specify a lot of file formats just from some
magic bits, see /etc/magic, /usr/share/misc/file/magic and magic(5)
for this.
Additionally there are some more programs for getting at detailed info
for soundfiles, like sndinfo included in Csound. Maybe you can rip
some of their logic.
Ciao
--
Frank Barknecht _ ______footils.org_ __goto10.org__
3 Oct
3 Oct
4:50 a.m.
Hi list,
On Sun, 2 Oct 2005 19:55:17 +0200
Frank Barknecht <fbar(a)footils.org> wrote:
[..]
Additionally, the "magic" command and its detection abilities are
separated nowadays - at least on my Debian system with "file" version 4.03
you also get the packages "libmagic1" and "libmagic-dev" which allow
to
use "file" functionality in any C/C++ program. Try "man 3 libmagic".
Greetings,
Frank
Additionally,
libsndfile support wouldnt be that bad either, so, I am
wondering, is there a reliable way to detect a audio streams file
format just given some bits of the header?
The "file" command can specify a lot of file formats just from some
magic bits, see /etc/magic, /usr/share/misc/file/magic and magic(5)
for this. 
2 Oct
2 Oct
4:12 p.m.
On Sun, Oct 02, 2005 at 02:01:50PM +0200, Mario Lang wrote:
Hi.
My little time-compressing audio player yatm currently supports 3 different
audio formats, ogg and speex via the xiph libraries, and mpeg via libmad.
I currently just blindly try to launch the decoder for either ogg, speex or
mp3 in series. SO if the first fails, I try the second, and so on. Which
kinda works but is a bit ugly. I'd like to add flac support at some point,
which would make this even more ugly.
Additionally, libsndfile support wouldnt be that bad either, so, I am
wondering, is there a reliable way to detect a audio streams file
format just given some bits of the header? So that I could set the
appropriate decoder algorithm based on that analysis? Or is
there actually a library one step higher level than libsndfile which
does generic audioformat to PCM? I guess not...
Hi,
you might want to take a look at Aqualung (aqualung.sf.net) which is a
music player program supporting a reasonable range of formats. The
input library (the part of the software that opens soundfiles,
determines their format and decodes them to float PCM) is a component
not too tightly integrated with the rest of the app. In fact, it is
built separately as a lib and linked statically to the rest of the
program. However, it supports only read-only access, and was not meant
to be used out of the scope of its mother application, which means you
won't be able to use it as an immediate drop-in solution. (It might be
possible with some hacking, since interdependencies with the rest of
the program are not conceptual and remain mostly because of my
laziness and limited resources.)
This module (called the "file decoder") works by probing individual
format plugins on the file (well, not plugins in the usual sense, they
are only modules with a predefined, simple api) that are responsible
for correctly reporting whether they are able to deal with the
file. This part of the software itself is fairly structured (at least
I believe so), there are no excessive comments but the big picture
should be clear for any programmer after a bit of investigation.
If you decide to take a look, download the CVS sources of Aqualung and
look in src/decoder/. Feel free to contact me if you have questions.
Tom
3 Oct
3 Oct
9:15 a.m.
Mario Lang wrote:
Hi.
My little time-compressing audio player yatm currently supports 3 different
audio formats, ogg and speex via the xiph libraries, and mpeg via libmad.
I currently just blindly try to launch the decoder for either ogg, speex or
mp3 in series. SO if the first fails, I try the second, and so on. Which
kinda works but is a bit ugly. I'd like to add flac support at some point,
which would make this even more ugly.
Additionally, libsndfile support wouldnt be that bad either, so, I am
wondering, is there a reliable way to detect a audio streams file
format just given some bits of the header?
For the vast majority of file formats yes.
So that I could set the
appropriate decoder algorithm based on that analysis? Or is
there actually a library one step higher level than libsndfile which
does generic audioformat to PCM?
Isn't that what libsndfile does?
BTW, the latest release of libsndfile supports FLAC via the same API
as all the other formats.
Erik
--
+-----------------------------------------------------------+
Erik de Castro Lopo
+-----------------------------------------------------------+
Spammer: Any of you guys looking for a permanent position in Scotland?
Kaz Kylheku: No, I'm looking for a thug in Scotland who might be interested
in beating up off-topic Usenet spammers, on a pro bono basis.
10:23 a.m.
Erik de Castro Lopo <mle+la(a)mega-nerd.com> writes:
Yes :-)
So that I
could set the
appropriate decoder algorithm based on that analysis? Or is
there actually a library one step higher level than libsndfile which
does generic audioformat to PCM?
Isn't that what libsndfile does?
BTW, the latest release of libsndfile supports FLAC via the same API
as all the other formats.
GREAT!!! I was soooo waiting for this! So now I'll
be able to read
flac files in SuperCollider.
Now, if libsndfile only would do vorbis and mp3 too, I could just
use it as the backend for everything.
--
CYa,
Mario
3:25 p.m.
Mario Lang wrote:
Erik de Castro Lopo <mle+la(a)mega-nerd.com>
writes:
Vorbis is coming. MP3 won't happen because of the legal issue
surrounding MP3.
Erik
--
+-----------------------------------------------------------+
Erik de Castro Lopo
+-----------------------------------------------------------+
Journalist: Microsoft CEO Steve Ballmer has finally said Linux
is the No. 1 threat to Windows. What's your response to that?
Linus : "Tag, you're it." I don't care. They've had a lot of
enemies in their time. Let them fight one enemy that
doesn't care for a change.
BTW, the latest release of libsndfile supports
FLAC via the same API
as all the other formats.
GREAT!!! I was soooo waiting for this! So now I'll be able to read
flac files in SuperCollider.
Now, if libsndfile only would do vorbis and mp3 too, I could just
use it as the backend for everything.
6813
days inactive
6814
days old
linux-audio-dev@lists.linuxaudio.org
9 comments
6 participants
participants (6)
-
carmen -
Erik de Castro Lopo -
Frank Barknecht -
Frank Neumann -
Mario Lang -
Tom Szilagyi