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


Joined: 18 May 2008
Posts: 4351

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: 493
Location: State of Jefferson

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: 493
Location: State of Jefferson

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: 780

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: 493
Location: State of Jefferson

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: 780

PostPosted: Mon 07 May 2012, 14:56    Post subject:  

Ibidem: Thanks a lot - I will try that
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technosaurus


Joined: 18 May 2008
Posts: 4351

PostPosted: Fri 13 Jun 2014, 16:37    Post subject:  

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/trunk/gst-fluendo-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/

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technosaurus


Joined: 18 May 2008
Posts: 4351

PostPosted: Tue 17 Jun 2014, 17:32    Post subject:  

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

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Last edited by technosaurus on Thu 19 Jun 2014, 01:15; edited 1 time in total
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disciple

Joined: 20 May 2006
Posts: 6438
Location: Auckland, New Zealand

PostPosted: Tue 17 Jun 2014, 18:00    Post subject:  

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


Joined: 18 May 2008
Posts: 4351

PostPosted: Tue 17 Jun 2014, 18:29    Post subject:  

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 [url=https://groups.google.com/forum/#!topic/lz4c/I7Tav37-L7Y]source[/url] )

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

Code:
//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

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