Re: [patch v2] external MPEG audio decoding using libmpg123

Am Sun, 23 Sep 2018 00:28:33 +0200
schrieb Elio Blanca via Lame-dev <[email protected]>: 

> topolinik@cindy:/tmp/lametest.HDq5P/lame/frontend$ ./lame --verbose
> --decode compl.mp3 test.wav
> Error opening MPEG input file compl.mp3.
> Can't init infile 'compl.mp3'

This most weird. For some reason your build differs in that little
property of not being totally broken.

> My PC is an Intel Core i5 6200 with the latest Linux Mint Debian
> Edition 3 x86-64, aka Cindy.

Hm, works fine for me on Ubuntu 18.04 and $CUSTOM_SYSTEM with gcc 7.2.

Next step without thinking much is to compare libmpg123's debugging
output. If you add --enable-debug to the mpg123 and lame builds …

#!/bin/sh
set -e
workdir=$(mktemp -d -t lametest.XXXXX)
echo "working directory: $workdir"
cd $workdir
# creates mpg123-$TIMESTAMP.tar.bz2
# Alternatively, fetch svn://scm.orgis.org/mpg123/trunk and
# run `autoreconf -iv` there.
wget --content-disposition https://mpg123.org/snapshot
tar -xf mpg123-*.tar.bz2
cd mpg123-*/
./configure --enable-debug --prefix=$workdir/mpg123
make -j3
make install
cd $workdir
wget https://mpg123.org/test/lame-svn-r6432-libmpg123.patch
svn co https://svn.code.sf.net/p/lame/svn/trunk/lame lame
cd lame
patch -Np0 < ../lame-svn-r6432-libmpg123.patch
autoreconf
# gnu89 needed for mp3x, with gtk1
# If you do not care, remove --enable-mp3x.
#CFLAGS="-std=gnu89 $CFLAGS" \
PKG_CONFIG_PATH=$workdir/mpg123/lib/pkgconfig:$PKG_CONFIG_PATH \
./configure --enable-libmpg123 --enable-debug=alot
make -j3
pwd
# Now test things in frontend/

… you should observe different output than this:

shell$ svn export svn://scm.orgis.org/mpg123/test/compliance/layer3/compl.bit compl.mp3
shell$  ./lame --decode compl.mp3 test.wav 2>&1 | head -n 30
[src/libmpg123/readers.c:1106] debug: open_bad
[src/libmpg123/frame.c:837] debug: frame_gapless_init: given -1 frames, skip 0 and 0
[src/libmpg123/frame.c:849] debug: frame_gapless_init: from 0 to 0 samples
[src/libmpg123/frame.c:244] debug: resizing index to 1000
[src/libmpg123/index.c:75] debug: new index of size 1000 at 0x14edd50
[src/libmpg123/frame.c:246] debug: index resized... 1000 at 0x14edd50
[src/libmpg123/frame.c:256] debug: set up frame index of size 1000 (ret=0)
[src/libmpg123/libmpg123.c:73] debug: cpu opt setting
[src/libmpg123/libmpg123.c:180] debug: set flags to 0x8000
[src/libmpg123/readers.c:1106] debug: open_bad
[src/libmpg123/frame.c:837] debug: frame_gapless_init: given -1 frames, skip 0 and 0
[src/libmpg123/frame.c:849] debug: frame_gapless_init: from 0 to 0 samples
[src/libmpg123/index.c:132] debug: reset with size 1000
[src/libmpg123/readers.c:1120] debug: feed reader
[src/libmpg123/readers.c:1139] debug: feed reader init successful
[src/libmpg123/libmpg123.c:176] debug: set flags to 0x88000
[src/libmpg123/libmpg123.c:176] debug: set flags to 0x88020
[src/libmpg123/readers.c:1106] debug: open_bad
[src/libmpg123/frame.c:837] debug: frame_gapless_init: given -1 frames, skip 0 and 0
[src/libmpg123/frame.c:849] debug: frame_gapless_init: from 0 to 0 samples
[src/libmpg123/index.c:132] debug: reset with size 1000
[src/libmpg123/readers.c:1159] debug: stream reader
[src/libmpg123/libmpg123.c:642] debug: read frame
[src/libmpg123/parse.c:519] debug: trying to get frame 0 at 0
[src/libmpg123/parse.c:1048] debug: doing ahead check with BPF 192 at 4
[src/libmpg123/parse.c:1067] debug: After fetching next header, at 4
[src/libmpg123/parse.c:1074] debug: does next header 0xfffb54c4 match first 0xfffb54c4?
[src/libmpg123/parse.c:562] debug: read frame body of 188 at 4
[src/libmpg123/parse.c:149] debug: do we have lame tag?
[src/libmpg123/frame.c:1027] debug: changing scale value from 1.000000 to 1.000000 (peak estimated to -1.000000)
 

I presume your build does not get as far as read_frame. At least your
output should be smaller so that you can spare the `head -n 30`.

If that does not show anything, we need to add some more lines of
debugging output to lame, before libmpg123 comes into play.


Alrighty then,

Thomas

-- 
Thomas Orgis - Source Mage GNU/Linux Developer (http://www.sourcemage.org)
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