mad-dev January 2005

mad-dev@lists.mars.org

5 participants
5 discussions

RE: [mad-dev] PCM output to DAC
by Nigel Sinfield 28 Jan '05

28 Jan '05

I have libmad running on a 940T at 160MHz. It uses about 35% of the CPU decoding a 128kbps/44100Hz stereo MP3, so you should have no problem if your system isn't doing much else. RAM and flash won't be an issue for you, either. I don't use madplay any more, but it isn't resource-hungry. Sorry, can't help with the second part. > -----Original Message----- > From: mad-dev-admin(a)lists.mars.org > [mailto:mad-dev-admin@lists.mars.org]On Behalf Of Andrew Douglas > Sent: 27 January 2005 21:35 > To: mad-dev(a)lists.mars.org > Subject: [mad-dev] PCM output to DAC > > > Hi > > I'm currently developing on an Altera Excalibur EPXA1db board, which > has an arm922T running at 200 MHz, 32 MB ram and 8 MB flash. I've got > a Linux 2.4 kernel running on the board with a basic root filesystem. > I'm looking at cross-compiling madplay (& libmad) to run on this > architecture and would appreiciate a bit of advice before starting. > > 1. Does the system I'm using appear to have enough resources to be > able to run this application. Does anyone have figures for MIPS, > memory requirements and CPU usage for this application running on a > similar ARM architecture? My system has no hardware FPU but does have > an MMU. > > 2. I require the decoded stream to be sent, via general purpose IO > pins, to a customised PCB with a (16-bit) DAC and audio preamp. I plan > to use the folowing command: > > $ ./madplay --output=raw:/dev/dsp foo.mp3 > > Will I have to write a device driver to enable this or is there a > simple way to direct the stream to the memory mapped pins? > > Is there anything else that I overlooked? Any help would be > appreiciated. > > TIA > > Andy Douglas > 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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PCM output to DAC
by Andrew Douglas 27 Jan '05

27 Jan '05

Hi I'm currently developing on an Altera Excalibur EPXA1db board, which has an arm922T running at 200 MHz, 32 MB ram and 8 MB flash. I've got a Linux 2.4 kernel running on the board with a basic root filesystem. I'm looking at cross-compiling madplay (& libmad) to run on this architecture and would appreiciate a bit of advice before starting. 1. Does the system I'm using appear to have enough resources to be able to run this application. Does anyone have figures for MIPS, memory requirements and CPU usage for this application running on a similar ARM architecture? My system has no hardware FPU but does have an MMU. 2. I require the decoded stream to be sent, via general purpose IO pins, to a customised PCB with a (16-bit) DAC and audio preamp. I plan to use the folowing command: $ ./madplay --output=raw:/dev/dsp foo.mp3 Will I have to write a device driver to enable this or is there a simple way to direct the stream to the memory mapped pins? Is there anything else that I overlooked? Any help would be appreiciated. TIA Andy Douglas

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Porting MAD to Symbian series 60
by cin dul 16 Jan '05

16 Jan '05

Hi, Has anybody been successful in porting MAD to symbian series 60?? Please, if you have any ideas worth sharing... Thanks __________________________________ Do you Yahoo!? Yahoo! Mail - Helps protect you from nasty viruses. http://promotions.yahoo.com/new_mail

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How to generate mad.h ??
by cin dul 10 Jan '05

10 Jan '05

After built libmad, I still don't get mad.h file. I've been read the README file, it said : "The API for libmad can be found in the `mad.h' header file. Note that this file is automatically generated, and will not exist until after you have built the library." So?? How to generate mad.h?? Thanks __________________________________ Do you Yahoo!? Yahoo! Mail - Easier than ever with enhanced search. Learn more. http://info.mail.yahoo.com/mail_250

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libmad 0.15.1b assertion failure
by Glenn Maynard 04 Jan '05

04 Jan '05

I accidentally loaded some non-audio data in my application, and I'm getting: a.out: layer3.c:2640: mad_layer_III: Assertion `stream->md_len + md_len - si.main_data_begin <= (511 + 2048 + 8)' failed. I'm using the low-level interface. I can reproduce this with madlld, if I change INPUT_BUFFER_SIZE from 5*8192 to 4*8192 or lower (my own buffer is 16k). The file (edited down as small as I can get it while still triggering this) is at: http://zewt.org/~glenn/testfile There's some MPEG-1 video in there, which I suppose MAD is picking up; that's fine, I just want it to gracefully play garbage or give a fatal error, without dying. -- Glenn Maynard

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mad-dev January 2005