mad-dev November 2005

mad-dev@lists.mars.org

11 participants
16 discussions

Size of linked libraries
by Håvard Engebretsen 18 Nov '05

18 Nov '05

Hi! I just measured the memory usage of minimad during decoding to be approximately 4MB, and am having a hard time believing that all this is minimad. Thus, I am trying to determine the size added to the minimad code during run-time due to linked libraries (i.e. stdio, stdlib, unistd etc. ). I have tried compiling minimad with dynamic linked libraries to find the difference in memory usage, but without luck. Does anyone know a easy way to find the sizes of the libraries linked to the minimad application? Regards, Håvard

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Regarding the minimad source code and implementation of minimad in 8bit 8051 microcontroller.
by Håvard Engebretsen 14 Nov '05

14 Nov '05

Hi, Im thinking of trying to modify the minimad decoder so that I can implement it in a 8-bit 8051 microcontroller and have a couple of questions regarding the configure.h file: In line 80 in the configure.h file, it says: /* Define to enable a fast subband synthesis approximation optimization. */ /* #undef OPT_SSO */ Does this mean that OPT_SSO is always defined unless I undefined it? In line 107 in the configure.h file, it says: /* The size of a `int', as computed by sizeof. */ #define SIZEOF_INT 4 What determines SIZEOF_INT? (I understand that the sizeof function returns the size, but what actually makes the size of int 4, ). To redefine the question: Is it ever not 4, if so, when? A spin-off from that question is: can anyone tell me the sizes (in bits) of: signed int unsigned int signed long unsigned long Last question: Does anyone see any immediate show-stoppers for implementing the minimad decoder in a 8-bit microprocessor? Thanks in advance! Håvard

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RE: [mad-dev] help:loud noise in the madplay
by Nigel Sinfield 10 Nov '05

10 Nov '05

When I had this problem it turned out to be an 'endian' issue. mad output the samples one way, but the audio hardware required the other. -----Original Message----- On Nov 8, 2005, at 1:12 AM, feiye wrote: > I have transplant madplay to embedded linux2.4.18. When I play > the mp3,it has a loud noise in the music. > Has anybody met this before? Can anybody help? I remember problems very much like this when I was first creating mpg321, and IIRC the problem was a 'signed' issue. Perhaps 'char' is signed on your platform, and your output needs unsigned? I do remember the fix not making sense to me. PCM samples can be negative, I think, but I believe that I had to change to using unsigned char explicitly. Hope this helps, Joe The contents of this email and any attachments are sent for the personal attention of the addressee(s) only and may be confidential. If you are not the intended addressee, any use, disclosure or copying of this email and any attachments is unauthorised - please notify the sender by return and delete the message. Any representations or commitments expressed in this email are subject to contract. ntl Group Limited

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Re: mad-dev Digest, Vol 6, Issue 2
by freeoicq＠huawei.com 10 Nov '05

10 Nov '05

mad-dev-request,��ã� It seems that you only want a program that can interpret what is in the PCM file. So go to the internet and you can get some programs that deal with pcm and wav file format. ======= 2005-11-09 12:00:00 ��д��======= >Send mad-dev mailing list submissions to > mad-dev(a)lists.mars.org > >To subscribe or unsubscribe via the World Wide Web, visit > http://www.mars.org/bin/mailman/listinfo/mad-dev >or, via email, send a message with subject or body 'help' to > mad-dev-request(a)lists.mars.org > >You can reach the person managing the list at > mad-dev-owner(a)lists.mars.org > >When replying, please edit your Subject line so it is more specific >than "Re: Contents of mad-dev digest..." > > >Today's Topics: > > 1. Send the decoded sound to a file. (a19617(a)ualg.pt) > > >---------------------------------------------------------------------- > >Message: 1 >Date: Wed, 09 Nov 2005 17:12:45 +0000 >From: a19617(a)ualg.pt >Subject: [mad-dev] Send the decoded sound to a file. >To: mad-dev(a)lists.mars.org >Message-ID: <20051109171245.isgtaxfmogkw08gc(a)wmail.ualg.pt> >Content-Type: text/plain; charset=ISO-8859-1 > >hi.. > >I would like to know if is possible to send the decoded sound to a file, not >pcm file. A file that contains the values in hexadecimal or binary. >I need this because I need to read those values by another >program(Microblaze). And I'm not able to interpret the pcm file. >The Microblaze interprets C code and VHDL, and then I've to pass those values >to a FPGA. > >I don't know if anyone can help me. > >Bye... >-- >Sonia Gon�alves N� 19617 > ESI > > > > >End of mad-dev Digest, Vol 6, Issue 2 >************************************* = = = = = = = = = = = = = = = = = = = = �� freeoicq ��freeoicq(a)huawei.com ��2005-11-10

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help:loud noise in the madplay
by feiye 10 Nov '05

10 Nov '05

mad-dev I have transplant madplay to embedded linux2.4.18. When I play the mp3,it has a loud noise in the music. Has anybody met this before? Can anybody help? to configure libmad ,using: CC=arm-linux-gcc ./configure --enable-speed --disable-debugging --enable-fpm=arm --disable-nls --disable-mmap --host=arm-linux arm-linux-gcc3.2.3 Processor: dragonball mc9328mx1(arm920t) OS:embedded linux 2.4.18 audio oss madplay0.15.1b libmad0.15.1b libid3tag-0.15.1b Thank you for any help! 　　　　　　 feiye jingu_nb(a)126.com 　　　　　　　　　　　 2005-11-08 　　　　　　　　　　　　　　

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Send the decoded sound to a file.
by a19617＠ualg.pt 09 Nov '05

09 Nov '05

hi.. I would like to know if is possible to send the decoded sound to a file, not pcm file. A file that contains the values in hexadecimal or binary. I need this because I need to read those values by another program(Microblaze). And I'm not able to interpret the pcm file. The Microblaze interprets C code and VHDL, and then I've to pass those values to a FPGA. I don't know if anyone can help me. Bye... -- Sonia Gonçalves Nº 19617 ESI

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mad-dev November 2005