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@lists.mars.org [mailto:mad-dev-admin@lists.mars.org]On Behalf Of Andrew Douglas Sent: 27 January 2005 21:35 To: mad-dev@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

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