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Qns abt MAD Library support for ARM environment
by balaji shanmugam 20 Jul '04

20 Jul '04

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MAD library for TI-54X DSPs
by balaji shanmugam 20 Jul '04

20 Jul '04

Hi I am trying to port the MAD library for the TI-54X DSP and running into tight timing issues. When analysed, I found out that the 54X DSP takes more instructions to perform LONG calculations at the SYNTHESIS FILTER Bank stage as it is a 16 bit processor [but with a 40 bit accumulator]. As it is required to perform 72 times the DCT32 and the remaining MATRIX calculations at the SYNTH stage, I like to optimize the synthesis filter bank. I am not sure about using the Q28.4 format being used by MAD. Is there anyway we can use the Q15.1 format for the calculations? I like to know is there any hints or clues for the LONG calculations that I can make use of during my 54X porting phase. Also any thought about using the NORM instruction to round the final samples to 16 bit will be helpful. Regards Balaji Shanmugam _________________________________________________________________ Apply to 50,000 jobs now. http://go.msnserver.com/IN/46921.asp Post your CV on naukri.com today.

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MAD library for TI-54X DSPs
by balaji shanmugam 20 Jul '04

20 Jul '04

1 0

Qns abt MAD Library support for ARM environment
by balaji shanmugam 20 Jul '04

20 Jul '04

1 0

Clipping in output
by Deven Phillips 15 Jul '04

15 Jul '04

Hey all, I'm having a problem with some of the MP3s I am decoding having a lot of clipping/popping. Any ideas for fixing this? Deven

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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

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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

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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

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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

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