mad-dev June 2002

mad-dev@lists.mars.org

13 participants
9 discussions

mad server, madplay resume problem
by Eric Lyons 28 Jun '02

28 Jun '02

Hi, sorry for a long initial post. I'm trying to adapt madplay as a server, with simplified settings (always stereo, no resampling, etc). The simplest form of this server (though perhaps not the one to implement) *continuously* decodes a stream read from a named pipe. If the read of the pipe fails, it decodes silence. Another named pipe is used to check the size of the server's buffer and to cause it to be flushed (and maybe shutdown/stop the server). This could be done by having the input callback always return data (either from the pipe or silence), never returning MAD_FLOW_STOP. But I'm wondering about ASYNC mode, and whether using it would somehow be better/similar. Having trouble figuring out how async mode works and its application. Any comments on the best way to do this? Secondarily, my madplay (x86 Linux,mad-0.14.2b with and without MMAP support) seems to barf after resuming from pause/stop. Just get noise (interesting noise, but not musical noise) out the audio device. Anyone else seen this behavior? Eric. __________________________________________________ Do You Yahoo!? Yahoo! - Official partner of 2002 FIFA World Cup http://fifaworldcup.yahoo.com

2 1

Updating with libid3tag...
by Pigeon 24 Jun '02

24 Jun '02

Dear all, Hi... I've been following the e-mail archives about using libid3tag, like the http://www.mars.org/mailman/public/mad-dev/2002-January/000439.html and all those related threads. I'm wondering how I should be using it to update/change the information for, say, an mp3 file. I've been trying to do it using those id3_field_set* functions and then eventaully id3_tag_attachframe and id3_file_update. I have a brief look in the libid3tag source code and I'm not sure what I should be doing. And also I'm wondering if libid3tag can actually update the the file for me? Or I have to actually write to the write myself? Thanks a lot. Pigeon.

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Porting to TI DSP C54xx series
by robert hung 22 Jun '02

22 Jun '02

Hi there, Have MADPLAY been ported to any TI DSP c54xx series? Thanks robert

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DOS port
by Roger 21 Jun '02

21 Jun '02

Hi all, I'm new to the sourceforge thing, seen it about, and found some interesting code, but never really gone too far with anything. I found the mad project, and I've got it working under DOS (using the DJGPP toolset). I need something which can gracefully handle a power down at any point. I've played with FreeBSD/Linux, and read only file systems. But the boot time is just way too long. Anyway I originally ported the mpg123 library to DOS (see http://www.fareham.org/mpg123/index.htm ) but it's handling of VBR and unusual formats is poor (to be polite). I've got the MAD library working, and I'm just tidying up the audio initialisation and closedown code. At startup and shutdown there are still a few pops and crackles, also I need to move some buffer management code into the interrupt routine. Just a shout out to make sure that I'm not duplicating work done (or in progress) by anyone else. Also how do I go about getting this back into the code base (like the msvc++ tree) ? Thanks, Roger.

2 1

Help for using the MAD library
by Frédéric Aguilar 09 Jun '02

09 Jun '02

Good morning, I am planning to develop a MP3 player under ARM PDA (Pocket PC 2002) usable by blind people with speech synthesizer support. I think that it would be very interesting for them. I always have written original code. Unfortunately, I have never used third party library or code. So, I am a little lost. I have no idea how to use it. I have tried to compile it and I have lot of compilation errors. Furthermore, I don't understand the API structure. Would there be anyone to help me? Thanks in advance. Frédéric Aguilar.

1 0

Adding full streaming support to MAD WinAmp plugin
by Brian G. 09 Jun '02

09 Jun '02

Is anyone working on adding full streaming support to the MAD WinAmp plugin? If not, I would be willing to implement it. __________________________________________________ Do You Yahoo!? Yahoo! Tax Center - online filing with TurboTax http://taxes.yahoo.com/

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Compiling for ARM7DI (not TDMI)
by Gareth Bransby 06 Jun '02

06 Jun '02

I have compiled the library for an ARM7TDMI core and it works fine in the ARM simulator, when the simulator is set up to act like an ARM7TDMI (Not surprising...) Sadly the hardware we have is an ARM7DI, it does not have an extened multiply unit and therefore has a baby when we put the code into it. Tried to force the compiler to compile for an ARM7DI target, but at the end of comilation received a host of errors, all relating to the SMULL instruction, only supported by the TDMI range of cores. (USed the -mcpu=ARM7DI flag in the makefile to set the target platform) Is there a way to compile the library without incurring the SMULL instructions? I recall something to do with a generic C file that was slower than the optimised assemly, but was platform independant, I just can't remember enough details to dig it out and get it working. Does anyone know anything about this mysterious C file? Many thanks

4 14

Code size on ARM
by Gareth 05 Jun '02

05 Jun '02

I have got mad running on an ARM development board with no operating system using an arm-elf compiler and newlib that i built from source. I have modified minimad.c slightly to suit the application. It no longer takes command line arguments. The mp3 is compiled into the binary in an array so decode() is just passed the start address of this array. The output is still sent to stdout for now. mman.h is no longer needed. My problem is the compiled binary is 381K. The mp3 array is only 21K so this is not what is making it big. Are there any options i can pass to configure to optimise the code for size? This is what i passs to configure : --enable-speed --disable-debugging --enable-fpm=arm --disable-nls --disable-mmap --host=arm-elf The onnoying thing is a week ago the binary was compiling to about 220K. Now when i come back to it a week later after changing nothing it suddenly increases by 160K. Lastly, I am still not certain what this 'stat' struct is for. If I am passing the array to decode() can i replace stat.st_size with the size of the array? This is my main finction : { struct stat stat; unsigned char *fdm = &music[0]; //printf("Started :\n"); decode(fdm, stat.st_size); return 0; } Thanks

3 4

RE: [mad-dev] Code size on ARM
by Gareth 04 Jun '02

04 Jun '02

No i am not using the -g flag. What does it do? What do you mean i must stop? The code just runs on the board. I use AXD to download it with a multi-ICE interface and then tell it to go! When it is ready it will go in the flash so ther will be no need for a PC to be connected to it. -----Original Message----- From: Reza Naima [mailto:reza@reza.net] Sent: 04 June 2002 11:29 To: Gareth Subject: Re: [mad-dev] Code size on ARM Gareth wrote: > Thanks for the advice. I stripped the file and it is now 170k! That's less > than half the size! What are these symbols that have been stripped out? They > take up a lot of space. They're used for debugging mainly. Are you using the -g flag with gcc? If so, then you probably want to stop. Btw, how are you running your code without an operating system? -Reza

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mad-dev June 2002