English Amiga Board - Camd midi c++

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- - Camd midi c++ (https://eab.abime.net/showthread.php?t=77732)

Anyone got any experience of using the CAMD library?

I've got myself a nice MT-32 and a MIDI stream so it would be nice to put the two together :p

I can see the 'official' library on AmiNet and someone also did an open source version.

Neither version includes any proto type header files which is annoying, I want plug-and-play dammit!

I could generate my own header file but that would be hard and time consuming :guru

http://aminet.net/package/mus/edit/camd

CAMD also looks very complicated to use, not sure why :confused

Here is some sample code that I found (http://wiki.amigaos.net/wiki/Camd_Library)

PHP Code:


		
			
/*
** MidiThru.c
** Creates a link between named clusters
** 3/24/2012 Lyle Hazelwood
*/
 
#include <proto/camd.h>
#include <proto/dos.h>
#include <proto/exec.h>
#include <stdlib.h>
 
void bailout(char *);    // our cleanup
 
struct Library *CamdBase = NULL;
struct CamdIFace *ICamd = NULL;
 
// these don't have to be global,
//        but it makes cleanup easier.
struct MidiNode *ournode = NULL;
struct MidiLink *fromLink = NULL, *toLink = NULL;
int8 midisig = -1;
 
int main(int argc, char **argv)
{
    MidiMsg mmsg;
    uint32 signal;
    BOOL alive = TRUE;
 
    if(argc != 3)
    {
        IDOS->Printf("Shell usage %s from to\n", argv[0]);
        IDOS->Printf("where from and to are named MIDI clusters\n");
        return(1);
    }
 
    // We open camd.library and get the main interface
    CamdBase = IExec->OpenLibrary("camd.library", 36L);
    if(NULL == CamdBase) bailout("Can't open camd.library");
 
    ICamd = (struct CamdIFace *)IExec->GetInterface(CamdBase, "main", 1, NULL);
    if(NULL == ICamd) bailout("Can't get CAMD interface");
 
    // camd will use this signal when we have incoming MIDI
    midisig = IExec->AllocSignal(-1);
    if(-1 == midisig) bailout("Cant get a signal");
 
    // We create our MidiNode here, requesting buffers as desired
    ournode = ICamd->CreateMidi(MIDI_MsgQueue, 2048L,
        MIDI_SysExSize, 10000L,
        MIDI_RecvSignal, midisig,
        TAG_END);
    if(NULL == ournode) bailout("Can't Create MidiNode");
 
    // This is our input stream of MIDI messages
    fromLink = ICamd->AddMidiLink(ournode, MLTYPE_Receiver,
        MLINK_Location,argv[1],
        TAG_END);
    if(NULL == fromLink) bailout("Can't Add Input Link");
 
    // and our output stream
    toLink = ICamd->AddMidiLink(ournode, MLTYPE_Sender, 
        MLINK_Location, argv[2],
        TAG_END);
    if(NULL == toLink) bailout("Can't Add Output Link");
 
    IDOS->Printf("Success Linking %s to %s\n",argv[1],argv[2]);
 
    // Now with all the setup finished, we copy incoming 
    // MIDI messages back out again
    while(alive)
    {    // this will run until a BREAK is received (Ctrl-C)
 
        signal = IExec->Wait(SIGBREAKF_CTRL_C | 1L << midisig);
 
        if(signal & SIGBREAKF_CTRL_C)
            alive = FALSE;
 
        while(ICamd->GetMidi(ournode, &mmsg))
        {                                             // Every message we get...
            ICamd->PutMidi(toLink, mmsg.mm_Msg);  // we send back out.
        }
    }
 
    IDOS->Printf("MIDI Link from %s to %s is broken\n",argv[1],argv[2]);
 
    bailout(NULL);    // return all resources.
    return (0);
}
 
void bailout(char *reason)
{
    if(reason)
    {
        IDOS->Printf("%s\n",reason);
    }
 
    ICamd->RemoveMidiLink(toLink);
    ICamd->RemoveMidiLink(fromLink);
    ICamd->DeleteMidi(ournode);
    IExec->FreeSignal(midisig);
    IExec->DropInterface((struct Interface *)ICamd);
    IExec->CloseLibrary(CamdBase);
 
    if(reason) exit(-1);
}

I just want to pass some MIDI data through my serial port to my MIDI interface, nothing fancy. Maybe CAMD isn't the best solution, anyone got any better ideas?

Maybe you can ask matheussen?

https://github.com/kmatheussen/camd

Yep, just did...thanks :)

Update: I'm now thinking it will be easier for me to just open the serial device and pass my MIDI data to it directly (and skip CAMD)

http://www.soundonsound.com/sos/1995...miganotes.html

You might look on the Developer CD. I think the official release version and headers are there.

Thanks, I'll see if I can find the CD on the Net :)

Quote:

Originally Posted by NovaCoder (Post 1013502)

I would ask that you try to stick with camd as it would allow those without midi hardware to have music through softsynth as well. SimonII could have done with having camd support when it was released.

I added the files from the dev cd to the zone if they can help.

Thanks and thanks :)

Yep, I'll try with camd

Update:

I had to create my own header file for gcc in the end, I'll upload my generated header here for the future generations ;)

It kind of works with DOOM but doesn't sound quite right, I think it's some kind of timing issue. I can't tell if it's a problem with the data being supplied to the library or if I'm just using it wrong.

The other option is to just read a midi file myself but after looking at the code examples it seems ridiculously complicated.

Instead of a nice a simple

PHP Code:


		
			
camd->parseMidi(FILE *filename);

or even a

PHP Code:


		
			
camd->parseMidi(byte *data);

It seems to need to run in a separate thread and constantly adjust the timing of the file (tempo).....painful!

OK got it working in ODAMEX :xmas

The problems I was having using the game to load and play a MIDI file was to do with priority...just not workable unless it runs in it's own thread.

So my solution for ODAMEX was to create a separate thread and read in the MIDI file, this seems to work fine.

I'm just uploading a video now...

https://www.youtube.com/watch?v=ShVvAVELTQM

Congrats bro! Very impressive :)

Quote:

Originally Posted by Retrofan (Post 1015358)

Congrats bro! Very impressive :)

Thanks, it's nice to finally be able to add MIDI support to my ports :)

Quote:

Originally Posted by NovaCoder (Post 1015386)

Thanks, it's nice to finally be able to add MIDI support to my ports :)

Do you think that leaving the music for the Roland -so improved a lot- then the CPU relieves some resources to improve speed with graphics, or is it "only" a benefit for the music?

Quote:

Originally Posted by Retrofan (Post 1015387)

Do you think that leaving the music for the Roland -so improved a lot- then the CPU relieves some resources to improve speed with graphics, or is it "only" a benefit for the music?

Yes for sure, not only does it sound much better than emulated MIDI it also has very little load on the CPU.

This should mean that ScummVM with MIDI music will run a bit faster than when you try and emulate MIDI.

Quote:

Originally Posted by NovaCoder (Post 1015395)

Yes for sure, not only does it sound much better than emulated MIDI it also has very little load on the CPU.

This should mean that ScummVM with MIDI music will run a bit faster than when you try and emulate MIDI.

What can I say? :shocked! :nuts? :cool:cool:cool :bowdown
(Translation: Amazing! Is he crazy?, So Cool-Cool-Cool Thanks master!)

Yeh! I'm getting excited, might just dig my Amiga back out of the cupboard!!

Great work Nova, is the midi Odamex available for download? I'd love to try it with my SC55 :D

Cool :)

No not yet, I'll add Prisma support then do a release!

No worries mate, can't wait!!

I'm porting the latest version of ODAMEX (0.7) at the same time so it will probably take me another couple of weeks.

:)

The best thing about this CAMD knowledge is that I can now begin adding real MIDI (and Prisma) support to a whole load of my earlier ports like Wolfy, Descent and Duke Nukem.

Quote:

Originally Posted by NovaCoder (Post 1016360)

The best thing about this CAMD knowledge is that I can now begin adding real MIDI (and Prisma) support to a whole load of my earlier ports like Wolfy, Descent and Duke Nukem.

Didn't even know you'd ported Descent! Wow, wouldn't have thought it possible on the humble Amiga! Will have to check it out. ;)

Does this also open up the possibility of real MIDI in ScummVM?

Quote:

Originally Posted by Amicol (Post 1016550)

Didn't even know you'd ported Descent! Wow, wouldn't have thought it possible on the humble Amiga! Will have to check it out. ;)

Does this also open up the possibility of real MIDI in ScummVM?

Yep :spin

Quote:

Originally Posted by NovaCoder (Post 1016360)

Nova can I try something you've made with the Prisma? I don't find it, sorry.

Thanks.