mad-dev September 2003

mad-dev@lists.mars.org

8 participants
7 discussions

.raw file size
by Rafael Avila de Espíndola 27 Sep '03

27 Sep '03

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I have noticed that that the .raw files generated by minimad and madplay differ slightly. For example, decoding a small .mp3 file the result was: 2428416 with madplay 2433024 with minimad What is the reason for this? Thanks. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (GNU/Linux) iD8DBQE/cPB/LlrfGJ8JUHwRAqm+AJ9FrsixBLd9wFzNy0xn0s0NaN6logCgnryW n/Y8zwqihqREzsDEPoereV4= =Jvdw -----END PGP SIGNATURE-----

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Need help
by veera malai 26 Sep '03

26 Sep '03

Hi, I have downloaded the free MP3 source code. But I am not able to open the files. The files are in .tar and .tar.gz format. Can anybody help me to open the files? Regards, Veeramalai.R ___________________________________________________ Meet your old school or college friends from 1 Million + database... Click here to reunite www.batchmates.com/rediff.asp

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libid3tag compatibility
by Dominic Mazzoni 25 Sep '03

25 Sep '03

Recently some users of Audacity have noted that when they save ID3v2 tags, most programs do not seem to recognize them. One user specifically tried WinAmp 3, CDEx 1.5, Windows Media Player 6.4, and WMP 7.01. None of them recognized any ID3v2 tags from an MP3 file output by Audacity (which uses libid3tag). ID3v1 tags work fine by all of those programs. I tried the same experiment. I tried saving some MP3 files using the last version of Audacity (which uses libid3tag 0.14.2b) and also a recompiled version using libid3tag 0.15.0b. First of all, ID3v1 tags always worked fine. When I opened the ID3v2-tagged files using Audacity, all of the tags loaded properly. So clearly the tags are being written, and libid3tag is able to open them. iTunes also opens them and parses all of the tags correctly on my Mac. However, I downloaded a few id3lib-based programs for Linux, and none of these were able to parse the ID3v2 files. Not a single tag. XMMS also failed, but I'm not sure it's supposed to have ID3v2 support. I don't use Windows anymore, so I can't repeat the experiment with Windows Media Player or Winamp. If anyone's interested in the Audacity part of the code, here's a pointer: http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/audacity/audacity-src/src/Ta… So... 1. Anyone have similar experiences? What level of support does most other software have for ID3v2 tags? 2. Are there any free programs out there you know of that write ID3v2 tags using libid3tag? It would be nice to see if they have the same behavior. It's possible that the bug is in Audacity. 3. Any plans to support writing older, but more compatible, versions of ID3 tags for better compatibility with other programs? Thanks, Dominic

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madplay 0.15b without mmap
by Rafael Avila de Espíndola 24 Sep '03

24 Sep '03

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I tried to compile madplay 0.15b without mmap( ./configure --disable-mmap ). Unfortunately the following error occurred: if gcc -DHAVE_CONFIG_H -I. -I. -I. -Iintl -DLOCALEDIR=\"/usr/local/share/ locale\" -Wall -march=i486 -g -O2 -MT player.o -MD -MP -MF ".deps/ player.Tpo" \ -c -o player.o `test -f 'player.c' || echo './'`player.c; \ then mv -f ".deps/player.Tpo" ".deps/player.Po"; \ else rm -f ".deps/player.Tpo"; exit 1; \ fi player.c: In function `map_file': player.c:302: warning: implicit declaration of function `mmap' player.c:302: error: `PROT_READ' undeclared (first use in this function) player.c:302: error: (Each undeclared identifier is reported only once player.c:302: error: for each function it appears in.) player.c:302: error: `MAP_SHARED' undeclared (first use in this function) player.c:302: warning: assignment makes pointer from integer without a cast player.c:303: error: `MAP_FAILED' undeclared (first use in this function) player.c:307: warning: implicit declaration of function `madvise' player.c:307: error: `MADV_SEQUENTIAL' undeclared (first use in this function) player.c: In function `unmap_file': player.c:320: warning: implicit declaration of function `munmap' make[2]: ** [player.o] Erro 1 make[2]: Leaving directory `/home/rafael/unicamp/iniciacao/madplay-0.15.0b' make[1]: ** [all-recursive] Erro 1 make[1]: Leaving directory `/home/rafael/unicamp/iniciacao/madplay-0.15.0b' make: ** [all] Erro 2 The system is a Debian unstable. Does someone knows what is wrong? Thanks. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (GNU/Linux) iD8DBQE/cOtdLlrfGJ8JUHwRAl++AJ0W1yWdm13lZNeeWG4qPbxTm4rQowCg0J5Z AnNoXwxyBarhkay3uuJQ/FA= =BAah -----END PGP SIGNATURE-----

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Equalizer function
by hank.jan＠billionton.com.tw 24 Sep '03

24 Sep '03

Hi, I have roughly studied the code and found that madplay didn't have an equalizer function, though there exists a file, named equalizer.c . If I want to add the equalizer function in, how to do it? Can I just use the functions in equalizer.c ? And where should I call them? By the way, where can I find the information of equalizing different type of music, ex classical, pop, jazz... I mean what should the values be from 60Hz to 16k Hz? Thank you in advance.

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new imdct
by Rafael Avila de Espíndola 23 Sep '03

23 Sep '03

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I was testing the Szu-Wei Lee algorithm and found that it is faster than the one in libmad. A very simplistic implementation that directly follows the algorithm deduction is: static void sdct9(const mad_fixed_t x[9], mad_fixed_t y[9]){ mad_fixed_t x0,x1,x2,x3,x4,x5,x6,x7,x8; mad_fixed_t a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,a16,a17,a18,a19,a20,a21,a22,a23,a24,a25,a26; mad_fixed_t m1,m2,m3,m4,m5,m6,m7,m8; const mad_fixed_t d[]={ 0x1bb67ae8, /*sqrt(3)*/ 0xe1ee09bf, /*2*cos(8*M_PI/9)*/ 0x058e86a0, /*2*cos(4*M_PI/9)*/ 0x18836fa3, /*2*cos(2*M_PI/9)*/ 0x0af1d43a, /*2*sin(8*M_PI/9)*/ 0x1f838b8d, /*2*sin(4*M_PI/9)*/ 0x1491b752 /*2*sin(2*M_PI/9)*/ }; x0=x[0]; x1=x[1]; x2=x[2]; x3=x[3]; x4=x[4]; x5=x[5]; x6=x[6]; x7=x[7]; x8=x[8]; a1 =x3 + x5; a2 =x3 - x5; a3 =x6 + x2; a4 =x6 - x2; a5 =x1 + x7; a6 =x1 - x7; a7 =x8 + x0; a8 =x8 - x0; a9 =x4 + a5; a10=a1 + a3; a11=a10 + a7; a12=a3 - a7; a13=a1 - a7; a14=a1 - a3; a15=a2 - a4; a16=a15 + a8; a17=a4 + a8; a18=a2 - a8; a19=a2 + a4; m1 =mad_f_mul(-d[0], a6); m2 =mad_f_mul(-d[1], a12); m3 =mad_f_mul(-d[2], a13); m4 =mad_f_mul(-d[3], a14); m5 =mad_f_mul(-d[0], a16); m6 =mad_f_mul(-d[4], a17); m7 =mad_f_mul(-d[5], a18); m8 =mad_f_mul(-d[6], a19); a20=x4 + x4 -a5; a21=a20+m2; a22=a20-m2; a23=a20+m3; a24=m1+m6; a25=m1-m6; a26=m1+m7; y[0]=a9+a11; y[1]=m8-a26; y[2]=m4-a21; y[3]=m5; y[4]=a22-m3; y[5]=a25-m7; y[6]=a11-a9-a9; y[7]=a24+m8; y[8]=a23+m4; } static void sdct18(const mad_fixed_t x[18], mad_fixed_t X[36]){ mad_fixed_t u[9]; mad_fixed_t v[9]; mad_fixed_t x1[9]; mad_fixed_t x2[9]; int i; const mad_fixed_t costab[]={ 0x1fe0d3b4, /*2*cos(M_PI*(2*i+1)/(2*18))*/ 0x1ee8dd47, /*2*cos(M_PI*(2*i+1)/(2*18))*/ 0x1d007930, /*2*cos(M_PI*(2*i+1)/(2*18))*/ 0x1a367e59, /*2*cos(M_PI*(2*i+1)/(2*18))*/ 0x16a09e66, /*2*cos(M_PI*(2*i+1)/(2*18))*/ 0x125abcf8, /*2*cos(M_PI*(2*i+1)/(2*18))*/ 0x0d8616bc, /*2*cos(M_PI*(2*i+1)/(2*18))*/ 0x08483ee1, /*2*cos(M_PI*(2*i+1)/(2*18))*/ 0x02c9fad7 /*2*cos(M_PI*(2*i+1)/(2*18))*/ }; for(i=0;i<9;i++){ x1[i]=x[i]+x[18-1-i]; x2[i]=mad_f_mul((x[i]-x[18-1-i]),costab[i]); } sdct9(x1,u); sdct9(x2,v); for(i=1;i<9;i++) v[i]=v[i]-v[i-1]; X[0]=u[0]; X[1]=v[0]; for(i=1;i<9;i++){ X[2*i]=u[i]; X[2*i+1]=v[i]; } } static void dctIV(mad_fixed_t const y[18], mad_fixed_t X[36]){ int i; mad_fixed_t temp[18]; mad_fixed_t costab[]={ 0x0ffc19fd, /*cos(M_PI*(2*i+1)/(2*36))*/ 0x0fdcf549, /*cos(M_PI*(2*i+1)/(2*36))*/ 0x0f9ee890, /*cos(M_PI*(2*i+1)/(2*36))*/ 0x0f426cb5, /*cos(M_PI*(2*i+1)/(2*36))*/ 0x0ec835e8, /*cos(M_PI*(2*i+1)/(2*36))*/ 0x0e313245, /*cos(M_PI*(2*i+1)/(2*36))*/ 0x0d7e8807, /*cos(M_PI*(2*i+1)/(2*36))*/ 0x0cb19346, /*cos(M_PI*(2*i+1)/(2*36))*/ 0x0bcbe352, /*cos(M_PI*(2*i+1)/(2*36))*/ 0x0acf37ad, /*cos(M_PI*(2*i+1)/(2*36))*/ 0x09bd7ca0, /*cos(M_PI*(2*i+1)/(2*36))*/ 0x0898c779, /*cos(M_PI*(2*i+1)/(2*36))*/ 0x07635284, /*cos(M_PI*(2*i+1)/(2*36))*/ 0x061f78aa, /*cos(M_PI*(2*i+1)/(2*36))*/ 0x04cfb0e2, /*cos(M_PI*(2*i+1)/(2*36))*/ 0x03768962, /*cos(M_PI*(2*i+1)/(2*36))*/ 0x0216a2a2, /*cos(M_PI*(2*i+1)/(2*36))*/ 0x00b2aa3e /*cos(M_PI*(2*i+1)/(2*36))*/ }; for(i=0;i<18;i++){ temp[i]=mad_f_mul(y[i],costab[i]); } sdct18(temp, X); for(i=1;i<18;i++) X[i]=X[i]-X[i-1]; } static inline void my_imdct36(mad_fixed_t const X[18], mad_fixed_t y[36]){ mad_fixed_t temp[36]; int m; dctIV(X,temp); for(m=0;m<18;m++) temp[35-m]=-temp[m]; for(m=0;m<=8;m++) y[m+3*9]=-temp[m]; for(m=9;m<36;m++) y[m-9]=temp[m]; } The imdct of size 12 has not been implemented. I will now work on it and on some optimisations. Hope this is useful. Rafael. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (GNU/Linux) iD8DBQE/b7nBLlrfGJ8JUHwRAvkcAJoCSK5uIWWmbZNru3U7ATfllFk71ACdHtUP mrFQRfHU8Wl+vdUZ5kwt0cw= =k3e9 -----END PGP SIGNATURE-----

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Play different sound types
by scotty.lin＠billionton.com.tw 23 Sep '03

23 Sep '03

Hi, How can I play different sound type with madplayer. The madplayer support many sound type such as *.cda, *.aif, *.wav and *.mp3 but only mp3 files that I can play in my computer. Could somebody tell me how to play the sounds such as *.cda, *.aif, *.wav. Best regards, Scott LIN (林志育) Billionton System Inc. Tel: 03-5729399 #258 Fax: 03-5729393 E-Mail: scotty.lin(a)billionton.com.tw

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mad-dev September 2003