minimp3 source code

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goingnuts
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#21 Post by goingnuts »

Thanks for the new small players! Tried to compile your modified minimp3 using ulibc - seems to work ok - but size is huge 44K.
Attachments
minimp3-ulib_static.tar.gz
minimp3-ulib_static 44K
(25.59 KiB) Downloaded 638 times

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technosaurus
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#22 Post by technosaurus »

it only adds about 20kb to busybox if you compile statically against static uclibc (using CFLAGS="-ffunction-sections -fdata-sections ...:" and LDFLAGS="-Wl,...,--gc-sections,... ")

I submitted the patch to the busybox mail list and Denys Vlasenko sent me some tips for shrinking the size even further. I will post the tarball with the patch and notes from Denys. So far I haven't been able to do much more than the formatting without breaking the build.
Attachments
minimp3-busybox-patch.tar.gz
extract in your busybox source root and run: patch -p0 <....patch
(24.73 KiB) Downloaded 607 times
Check out my [url=https://github.com/technosaurus]github repositories[/url]. I may eventually get around to updating my [url=http://bashismal.blogspot.com]blogspot[/url].

jpeps
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#23 Post by jpeps »

Where is busybox source stored? Thanks

edit: I guess I could just download 1.16.2 from icewalkers.

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technosaurus
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#24 Post by technosaurus »

it was diffed against the latest stable shortly after its release:
http://busybox.net/downloads/busybox-1.17.2.tar.bz2
Ffor continuity it is best to try applying against master:
http://git.busybox.net/busybox/snapshot ... er.tar.bz2
or at least the latest snapshot:
http://busybox.net/downloads/snapshots/ ... ot.tar.bz2
Check out my [url=https://github.com/technosaurus]github repositories[/url]. I may eventually get around to updating my [url=http://bashismal.blogspot.com]blogspot[/url].

goingnuts
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#25 Post by goingnuts »

technosaurus wrote:...it but if you can point me to a small standalone example(s), I may be able to hack it in there. I'd also need a C example to parse the file extension.
Attached small application that find file extension and launch minimp3, wavplay or play .au directly. Could be done by script...

bplay have some code that determines file-extension but I do not understand how - else bplay merged with minimp3 could be a more complete player (if size still could be small).

Update: Refined (...?) the code, added multi player capabilities - just through all your audio files to the launcher and they will play. Also included a much smaller static binary compiled using diet-lib (9K). Do not use spaces in filename - working on this bug...

Still not very useful compared to a simple script...but fun to sniff to C-coding...
Another (last) update: Now works with file-names containing spaces.
Attachments
launcher_example_C.tar.gz
Updated (3vers.) example program written in C to determine file extension and launch wavplay, minimp3 or play .au-files directly
(7.97 KiB) Downloaded 582 times
Last edited by goingnuts on Sat 13 Nov 2010, 09:15, edited 3 times in total.

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technosaurus
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#26 Post by technosaurus »

I forgot these functions that I have added to bashbox:
(doesn't work for _ALL_ files though)

Code: Select all

play_au() { #just sends $@ to /dev/audio
cat $@ > /dev/audio
}

play_wav() { #just sends $@ to /dev/dsp
cat $@ > /dev/dsp
}
Check out my [url=https://github.com/technosaurus]github repositories[/url]. I may eventually get around to updating my [url=http://bashismal.blogspot.com]blogspot[/url].

Ibidem
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Test w/musl libc...

#27 Post by Ibidem »

Yes I know this thread is old--but I thought I'd rather not steal the pupngo thread.

Here's the sizes when built with musl libc and stripped:

Code: Select all

-rwxr-xr-x 1 ibid ibid 46028 2012-04-15 18:28 minimp3-musl
-rwxr-xr-x 1 ibid ibid 33724 2012-04-15 18:28 minimp3-musl,os
-rwxr-xr-x 1 ibid ibid 42944 2012-04-15 18:28 minimp3-musl,s
-rwxr-xr-x 1 ibid ibid 29288 2012-04-15 18:28 minimp3-musl.upx
musl,os : built with -Os
musl,s: built with -static -Os
musl: unoptimized, dynamically linked
musl.upx: musl,s after upx --best

All of them sound decent (close to mpg123)
RSS ~1MB, CPU 4%.

(Built on Ubuntu Lucid)

goingnuts
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#28 Post by goingnuts »

Attached slightly modified source - accept command -q for silent run (like mpg123). Build static with diet libc:

Code: Select all

-rwxr-xr-x 1 root root 40084 2012-04-16 20:59 minimp3
Build static with uclibc:

Code: Select all

-rwxr-xr-x 1 root root 47116 2012-04-16 21:04 minimp3
Attachments
minimp3_source_mod.tar.gz
modified to accept command line -q for silent run
(34.09 KiB) Downloaded 508 times

Ibidem
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#29 Post by Ibidem »

Code: Select all

musl-gcc -pipe -Os -mtune=i686 -static -s -ffunction-sections -fdata-sections -D_XOPEN_SOURCE -Wl,--gc-sections -finline-functions-called-once -fmerge-all-constants -fexpensive-optimizations -fomit-frame-pointer -fpeephole2 -fno-loop-optimize -momit-leaf-frame-pointer minimp3.c
gives 40736 bytes; stripped is 40588 bytes
49183 bytes built with -Os -static -D_XOPEN_SOURCE and unstripped, so that's a tiny bit larger than uclibc.

goingnuts
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#30 Post by goingnuts »

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.

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... :)

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: Select all

mpg123 -@ http://players.creacast.com/creacast/classique/playlist.pls
Attachments
mpg123-1.13.4_diet_build_tools.tar.gz
patch and buildscript for diet libc compiled mpg123
(653 Bytes) Downloaded 473 times

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technosaurus
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#31 Post by technosaurus »

goingnuts wrote:
While surfing I found this page with some nice instructions for streaming mp3 and a poor mans skype... :)

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: Select all

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.
Check out my [url=https://github.com/technosaurus]github repositories[/url]. I may eventually get around to updating my [url=http://bashismal.blogspot.com]blogspot[/url].

Ibidem
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#32 Post by Ibidem »

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... :)

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: Select all

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).

Ibidem
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#33 Post by Ibidem »

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
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.

goingnuts
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#34 Post by goingnuts »

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?

Ibidem
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#35 Post by Ibidem »

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.

goingnuts
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#36 Post by goingnuts »

Ibidem: Thanks a lot - I will try that

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technosaurus
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#37 Post by technosaurus »

I recently took a look at this and noticed that many arrays are malloc'ed and then filled with unchanging data and that some ranges of the arrays are not even used. If these were setup in pre-allocated tables, many of the process intensive computations could be avoided and overall memory usage would be reduced.

csa_table - only uses parts [0], [2] and [3]
ci_table is only used to compute ca and cs ....could be replaced with precalculated ca and cs, but since only 1 more array is used in the csa_table - may as well just precompute them all (TODO)

table_4_3_exp and table_4_3_value get malloc'ed and computed anyhow, so may as well precompute those

huff_vlc, exp_table and exp_value_table are pre-allocated so no reason not to precalculate them

...lots more but I found an MIT licensed decoder from fluendo
https://core.fluendo.com/gstreamer/svn/ ... o-mp3/src/

and even better - Public Domain
https://sites.google.com/a/kmlager.com/www/projects
with sources here:
http://sourceforge.net/p/mp3dec/code/HEAD/tree/src/
Check out my [url=https://github.com/technosaurus]github repositories[/url]. I may eventually get around to updating my [url=http://bashismal.blogspot.com]blogspot[/url].

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technosaurus
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#38 Post by technosaurus »

Here is an ID3 tag stripper for players that they mess with

Code: Select all

#include <fcntl.h>
#define DUMPTAGS
int main(int argc, char **argv){
	unsigned char buf[4096];
	int len,fd = open(argv[1],O_RDONLY);
	while (len=read(fd,buf,10)){ // handle ID3v2 tags (maybe multiple)
		if (buf[0]=='I' && buf[1]=='D' && buf[2]=='3'){
			len=read(fd,buf,buf[9]|(buf[8] << 7)|(buf[7] << 14)|(buf[6] << 21));
#ifdef DUMPTAGS
			write(2,buf,len);
#endif
		} else break;
	}
	while (write(1,buf,len)){
		unsigned char tag[3] = {'T','A','G'}, *end;
		len=read(fd,buf,4096);
		end=(unsigned char *)memmem(buf,len,&tag,3);
		if (end){ //handle ID3v1 tag (should only be 1)
			write(1,buf,end-buf);
#ifdef DUMPTAGS
			write(2,end,len-(end-buf));
#endif
			break;
		}
	}
}
to strip a file and save the tags:
id3strip my.mp3 >mynew.mp3 2>my.tags

to strip only:
id3strip my.mp3 >mynew.mp3 2>/dev/null

to combine a bunch of mp3s
# 1st create empty file mynew.mp3 - not shown
for x in *.mp3; do
id3strip "$x" >>mynew.mp3 2>/dev/null
done
Last edited by technosaurus on Thu 19 Jun 2014, 05:15, edited 1 time in total.
Check out my [url=https://github.com/technosaurus]github repositories[/url]. I may eventually get around to updating my [url=http://bashismal.blogspot.com]blogspot[/url].

disciple
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#39 Post by disciple »

Just in case anyone else wants to look at it, the original site for minimp3 seems to have moved to http://keyj.emphy.de/minimp3/.
He has some other interesting stuff on there - Photojoin looks handy and he has a proposed filesystem to improve boot performance with live CDs: http://keyj.emphy.de/profs-proposal/
One thing I can't understand, Techno - he said that minimp3 is slow because it is based on the ffmpeg decoder. So were we interested in it here because we care about ram much more than speed? Or does the speed improve with uclibc or something?
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technosaurus
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#40 Post by technosaurus »

really I wanted something that could fit inside my 1mb linux kernel with X,jwm&rxvt in the initramfs ... turns out recording with 8kz MU_LAW format using arecord allows you to use cat $file >/dev/audio
I just compress it with xz -ze9 and then use zcat for simple, lossless compression
(Note: adding a simple delta encoder and decoder would still be really fast and compress ~15% better source )

Here my public domain ogg player that uses Sean Barrett's public domain stb_vorbis

Code: Select all

//diet gcc -Os -finline-small-functions oggplay.c -ffunction-sections -fdata-sections -fmerge-all-constants -Wl,--gc-sections,-s -o oggplay -lm
#define STB_VORBIS_NO_PUSHDATA_API
#define STB_VORBIS_NO_INLINE_DECODE

#include "stb_vorbis.c"
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/soundcard.h>

static inline void write2(char *msg){
	write(2,msg,strlen(msg));
}

int main(int argc, char **argv){
	int error,
	value = AFMT_S16_LE ,
	pcm = open("/dev/dsp", O_WRONLY);
	if (pcm < 0)
		write2("cannot get fd\n");
	if (ioctl(pcm, SNDCTL_DSP_SETFMT, &value) < 0)
		write2("cannot set audio format: %s\n");

while (--argc) {
    short *decoded;
    int channels, len, sample_rate;
    len = stb_vorbis_decode_filename(argv[argc], &channels, &sample_rate, &decoded);
    if (ioctl(pcm, SNDCTL_DSP_CHANNELS, &channels) < 0)
		write2("cannot set channels");
    if (ioctl(pcm, SNDCTL_DSP_SPEED, &sample_rate) < 0)
		write2("cannot set sample rate");
	if (len>0) write(pcm,decoded,len*channels);
}
close(pcm);
return 0;
}
note on pulseaudio systems run all of these programs with padsp
padsp minimp3 my.mp3
Check out my [url=https://github.com/technosaurus]github repositories[/url]. I may eventually get around to updating my [url=http://bashismal.blogspot.com]blogspot[/url].

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