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 Forum index » Off-Topic Area » Programming
minimp3 source code
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technosaurus


Joined: 18 May 2008
Posts: 3843
PostPosted: Tue 17 Apr 2012, 13:50    Post subject:  
goingnuts wrote:


While surfing I found this page with some nice instructions for streaming mp3 and a poor mans skype... Smile

Might be that the minimp3 could also be hacked to play URL playlists? The mpg123 can play internet radio by issuing the following command:
Code:
mpg123 -@ http://players.creacast.com/creacast/classique/playlist.pls
I looked into doing poor mans voip this way but hit a brick wall when looking for a way to get the non.local IP address ... needed some external server like dyndns but I never solved it ... only tested locally with local IPs using ffmpeg... still I like the Unix philosophy of tools doing 1thing well and using them together liberally rather than reinvent existing code every time you need to combine 2+ functions. ... for instance you can use netcat, SSH, telnet, dropbear... instead of bolting their capabilities into a program so it can work over the net.
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Ibidem

Joined: 25 May 2010
Posts: 243
PostPosted: Mon 23 Apr 2012, 00:10    Post subject:  
goingnuts wrote:

The mpg123 seems to compile easy with diet (a small diff and build script attached). It gives a 212K static bin. Wonder at what size musl will do that?

Tried to use the latest mpg123 ("mpg123-1.13.8") - it compiled but did have issues playing mp3. Then went for mpg123-1.13.4 which also compiles and on top of that actually plays mp3.

Also did a quick test with mpg321 but that seems harder to patch for diet libc.

While surfing I found this page with some nice instructions for streaming mp3 and a poor mans skype... Smile

Might be that the minimp3 could also be hacked to play URL playlists? The mpg123 can play internet radio by issuing the following command:
Code:
mpg123 -@ http://players.creacast.com/creacast/classique/playlist.pls

I've done the mpg123 internet radio thing a bit. It's nice and simple.

But I'd advise not trying to add netwirking--mpg123 is the undisputed King of the Hill there, you'll add a good bit of bloat, and you can probably do it via curl <url>|minimp3 - or such anyhow... (I assume that minimp3 supports stdin as a file?)
And FWIW-pls is not an mp3, so you'd have to implement a pls parser...best done in shell script.

Don't bother with mpg321-it was relevant several years ago, but IIRC current mpg123 has improved decoding on sub-pentium machines (which was the only reason to use mpg321).
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Ibidem

Joined: 25 May 2010
Posts: 243
PostPosted: Thu 03 May 2012, 15:00    Post subject:  
goingnuts wrote:
Ibidem: Thats a small difference in size - I think I will start looking more close on the musl!

The mpg123 seems to compile easy with diet (a small diff and build script attached). It gives a 212K static bin. Wonder at what size musl will do that?

Tried to use the latest mpg123 ("mpg123-1.13.8") - it compiled but did have issues playing mp3. Then went for mpg123-1.13.4 which also compiles and on top of that actually plays mp3.

mpg123, 1.13.4:
274612 bytes stripped, statically linked, stripped, compiled with -Os, using OSS audio only.
No other tricks involved except getting the Linux headers included, and building with -D_GNU_SOURCE.
This is upstream source, unpatched. Plays streaming mp3 fine.

In the FWIW department:
All these numbers are with a stock musl, including full UTF8 and everything else...Rich Felker says
Quote:
I would believe that it's possible to get smaller binaries with a
uClibc that's had lots of features turned off when the library was
built, meaning that those features are completely unavailable to
applications. On the other hand, I suspect musl will easily beat
uClibc in static linking size when uClibc is full-featured (UTF-8,
pthread, full malloc, stdio, hex floats in printf, ...) because musl
takes a lot more care not to have unnecessary cross-dependency between .o files in the static lib. Still, some things are impossible to
optimize out with the linker - for example, printf always pulls in a
minimum amount of UTF-8 conversion code for %ls and %c.
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goingnuts

Joined: 07 Dec 2008
Posts: 626
PostPosted: Thu 03 May 2012, 16:10    Post subject:  
Ibidem: With my uclibc (uClibc-0.9.27) I can get it down to 304K static/striped/oss only.

Tried to use musl-0.8.10 (compiled by "make" and installed by "new2dir make install")

Compiling mpg123 with musl was not 100 % successful:
Had to comment out #undef HAVE_MMAP in mpg123´s config.h.in to get mpg123 compiled and ended up with approx. 346K static/stripped bin. But it would not play...D...!

I will keep practice the musl though...

Any chance you could provide a musl-pet/sfs? Or maybe some examples of howto build simple things?
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Ibidem

Joined: 25 May 2010
Posts: 243
PostPosted: Sat 05 May 2012, 20:57    Post subject:  
1. Compile and install musl, preferably from git head (a release is a tag, not a branch, so all fixes are in git).
Copy config.mak from dist/ and adjust as you want.
PREFIX defaults to /usr/local/musl, and should not be set to /, /usr, or /usr/local (or you will kill your OS)
2. Get the linux kernel headers (linux-libc-dev, not the ones for building modules) and put them somewhere (I use /opt/musl/lin)
There should be a linux/ directory in there.
3. export CC=musl-gcc; export CFLAGS="-Os -static -fno-stack-protector -I/opt/musl/lin -D_GNU_SOURCE"
Don't forget the -D_GNU_SOURCE - most stuff won't build without that, though some will. -I/... should point to the linux headers.
(Note-the linux headers are needed for OSS and a lot besides)
4. Now run configure and make.

That's all that I know is needed.
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goingnuts

Joined: 07 Dec 2008
Posts: 626
PostPosted: Mon 07 May 2012, 14:56    Post subject:  
Ibidem: Thanks a lot - I will try that
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