mad-user June 2004

mad-user@lists.mars.org

7 participants
7 discussions

Where the hell is definition of struct id3_file????
by tj 29 Sep '06

29 Sep '06

In trying to learn how to use libid3, since there sems to be no documentatio. I am looking at soure trying to figure out how to use it. The first problem is the practically every call uses a pointer to a "struct id3_file" . Now, the problem is that there is no definition for id3_file structure in any .h file. I finally found it in file.c, a source file. How the hell are you supposed to use it in your app when the prototype is in a package source file? Seems that something is really broken here. tj

3 4

How to use libid3tag to find offset to first mp3 header
by tj 28 Jun '04

28 Jun '04

What call in libid3tag returns the offset to the mp3 header? Plus, how the hell is that four byte sync safe length decoded? tj

2 1

Decoding small blocks of data
by peter＠neocoder.net 28 Jun '04

28 Jun '04

Hi I am trying to decode a mp3-file 100kB at a time. My problem is that with each new block some errors occur "Huffman data overrun" "bad main_data_begin pointer" "lost synchronization" I'm not familiar with the mp3-format structure but i guess that the data in the file should be sent to the decoder in complete blocks. I was hoping that the decoder would save incomplete data from the end of the previous buffer sent and join them with the next buffer sent. But it isn't ? So if I want to decode small blocks of the file. If I look through the file and only send complete blocks of data to the decoder. Will this solve my problem? Is it the way it is supposed to work? Peter Hultqvist peter.hultqvist(a)neocoder.net 2004-06-27, 16:54:17

2 1

Question about data strcutures
by Deven Phillips 24 Jun '04

24 Jun '04

Hi, I have written an application which uses libMAD. I was looking at the code for the library and I find that two things are bothering me: 1. The majority of cleanup functions are just #define'd stubs and actually do nothing. 2. Why aren't the data structures typedef'd for easier use? Just curious, and perhaps you can all provide me with a reaonable explanation that will make me more comfortable with it. Thanks!! Deven Phillips

2 1

libid3 documentation
by tj 22 Jun '04

22 Jun '04

Where can I find out how to use libid3tag library? All I wnat to do is open an mp3 file, see if it has or hasn't a tag. If it does, get song and artist and el me where the start of mp3 audio is.. If no id3v2, let me know so I know the audio is at the front of the file. tj

2 1

Can't configure libid3tag form arm processor
by tj 08 Jun '04

08 Jun '04

I am trying to configure libid3tag.0.15.1b for the arm processor. But it keeps failing on zlib.h. I run ./configure --host=arm and get: checking assert.h usability... yes checking assert.h presence... yes checking for assert.h... yes checking for unistd.h... (cached) yes checking zlib.h usability... no checking zlib.h presence... no checking for zlib.h... no configure: error: zlib.h was not found *** You must first install zlib (libz) before you can build this package. *** If zlib is already installed, you may need to use the CPPFLAGS *** environment variable to specify its installed location, e.g. -I<dir>. I check /usr/local/arm/2.95.3/arm-linux/include and there is zlib.h It finds assert.h, whcih is in the same directory, so why not zlib.h? tj

2 1

Some make problems
by Ming Chi Tsai 05 Jun '04

05 Jun '04

Hi: I have a project that port madplay into embedded system(CPU:ARM, OS:uclinux). I know madplay can be build on uclinux using uclibc and arm cpu using arm-linux-gcc respectively. But, when I port madplay to embedded system with ARM and uclinux using arm-elf-gcc, I encountered some problems. The following is my make step: I use cygwin and arm-elf-gcc to build my project. export CPPFLAGS='-I/usr/local/include/' export LDFLAGS='-I/usr/local/lib/' $cd zlib-1.1.4 modify configure AR=$(AR-"ar rc") ---> AR="arm-elf-ar rc" RANLIB=$(RANLIB-"ranlib") ---> RANLIB=arm-elf-ranlib $./configure ---------------->down $cd libid3tag-0.15.1b $./configure CC=arm-elf-gcc --host=arm-elf --build=arm $make $make install ---------------->down $cd libmad-0.15.1b $./configure CC=arm-elf-gcc --host=arm-elf --build=arm $make $make install ---------------->down $cd madplay-0.15.2b $./configure CC=arm-elf-gcc --host=arm-elf --build=arm ---------------->error, because it can not find libmad and libid3tag. But I am sure the lib path is correct. Where am I wrong with the configure setting?? Whether madplay can't be ported to embedded system with ARM and uclinux or I should use anyother corse compiler. thanks for any reply. Tsaimc

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mad-user June 2004