Camd midi c++

NovaCoder · 05 April 2015, 03:12

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

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

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

CAMD also looks very complicated to use, not sure why

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?

Retrofan · 05 April 2015, 03:34

Maybe you can ask matheussen?

https://github.com/kmatheussen/camd

NovaCoder · 05 April 2015, 03:52

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

Samurai_Crow · 06 April 2015, 16:10

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

NovaCoder · 07 April 2015, 02:24

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

Mad-Matt · 07 April 2015, 13:27

Quote:

Originally Posted by NovaCoder

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

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.

NovaCoder · 08 April 2015, 01:08

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!

NovaCoder · 17 April 2015, 15:22

OK got it working in ODAMEX

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...

[ Show youtube player ]

Retrofan · 17 April 2015, 19:20

Congrats bro! Very impressive

NovaCoder · 18 April 2015, 00:39

Quote:

Originally Posted by Retrofan

Congrats bro! Very impressive

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

Retrofan · 18 April 2015, 00:52

Quote:

Originally Posted by NovaCoder

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?

NovaCoder · 18 April 2015, 02:29

Quote:

Originally Posted by Retrofan

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.

Retrofan · 18 April 2015, 02:34

Quote:

Originally Posted by NovaCoder

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?

!

?

(Translation: Amazing! Is he crazy?, So Cool-Cool-Cool Thanks master!)

Amicol · 18 April 2015, 17:52

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

NovaCoder · 19 April 2015, 05:37

Cool

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

Amicol · 23 April 2015, 18:22

No worries mate, can't wait!!

NovaCoder · 24 April 2015, 04:01

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.

Amicol · 25 April 2015, 04:58

Quote:

Originally Posted by NovaCoder

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?

NovaCoder · 25 April 2015, 12:22

Quote:

Originally Posted by Amicol

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

Retrofan · 23 October 2016, 00:19

Quote:

Originally Posted by NovaCoder

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.

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

Thanks.

05 April 2015, 03:12	#1
NovaCoder Registered User Join Date: Sep 2007 Location: Melbourne/Australia Posts: 4,400	Camd midi c++ 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 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 http://aminet.net/package/mus/edit/camd CAMD also looks very complicated to use, not sure why 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?

05 April 2015, 03:52	#3
NovaCoder Registered User Join Date: Sep 2007 Location: Melbourne/Australia Posts: 4,400	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 Last edited by NovaCoder; 06 April 2015 at 02:44.

08 April 2015, 01:08	#7
NovaCoder Registered User Join Date: Sep 2007 Location: Melbourne/Australia Posts: 4,400	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! Last edited by NovaCoder; 15 April 2015 at 02:16.

17 April 2015, 15:22	#8
NovaCoder Registered User Join Date: Sep 2007 Location: Melbourne/Australia Posts: 4,400	OK got it working in ODAMEX 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... [ Show youtube player ] Last edited by NovaCoder; 27 April 2015 at 03:56.

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05 April 2015, 03:34	#2
Retrofan Ruler of the Universe Join Date: Mar 2010 Location: Lanzarote/Spain Posts: 6,185	Maybe you can ask matheussen? https://github.com/kmatheussen/camd

06 April 2015, 16:10	#4
Samurai_Crow Total Chaos forever! Join Date: Aug 2007 Location: Waterville, MN, USA Age: 49 Posts: 2,186	You might look on the Developer CD. I think the official release version and headers are there.

07 April 2015, 02:24	#5
NovaCoder Registered User Join Date: Sep 2007 Location: Melbourne/Australia Posts: 4,400	Thanks, I'll see if I can find the CD on the Net

17 April 2015, 19:20	#9
Retrofan Ruler of the Universe Join Date: Mar 2010 Location: Lanzarote/Spain Posts: 6,185	Congrats bro! Very impressive

18 April 2015, 17:52	#14
Amicol Registered User Join Date: Dec 2013 Location: Hartlepool / England Posts: 389	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

19 April 2015, 05:37	#15
NovaCoder Registered User Join Date: Sep 2007 Location: Melbourne/Australia Posts: 4,400	Cool No not yet, I'll add Prisma support then do a release!

23 April 2015, 18:22	#16
Amicol Registered User Join Date: Dec 2013 Location: Hartlepool / England Posts: 389	No worries mate, can't wait!!

24 April 2015, 04:01	#17
NovaCoder Registered User Join Date: Sep 2007 Location: Melbourne/Australia Posts: 4,400	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.

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