I've finished another Reggae programming tutotial for MorphZone Library: "Playing a Synthesized, Continuous Wave". It demonstrates how Reggae can play realtime generated sound. Tutorial consists of ready to compile C source and discussion.

Beautiful tutorial and sample code!

@Krashan

I'm trying to open a picture with Reggae, but sofar no success ....

I started based on playaudio:message from the SDK

And changed/added the following:

.
.
if (!(PictureOutputBase = OpenLibrary("multimedia/picture.output", 51))) return FALSE;
.
.
.
printf("1\n");

if ((source = MediaNewObjectTags(
MMA_StreamName, (LONG)filename,
MMA_StreamType, (LONG)"file.stream",
MMA_MediaType, MMT_PICTURE,
TAG_END)))
{printf("2\n");
if ((player = NewObject(NULL, "picture.output", TAG_END)))
{printf("3\n");

if (MediaConnectTagList(source, 0, player, 0, NULL))
{
ULONG signals, sigmask = 1 << port->mp_SigBit;
printf("3\n");
.
.
.

Ok it should fail horribly afterwards when it tries to play music out of an PNG, but it never gets that far ..
Actually it nver even gets to that 2nd printf and all i get is "Reggae was unable to decode "ram:grab.png".

Could it be that I'm missing something as I allway thought reggae would fall back to datatypes when it encounters a picture it has no decoder for ?

from SCANdal:

if ((MultimediaBase = OpenLibrary("multimedia/multimedia.class", 52)))
{
Object *picture;
struct TagItem tags[10];
char *ptr;
struct MetaItem *metadata=NULL;

tags[0].ti_Tag= MMA_StreamType;
tags[0].ti_Data = (ULONG)"file.stream";
tags[1].ti_Tag = MMA_StreamName;
tags[1].ti_Data = msg->filename;
tags[2].ti_Tag = MMA_MediaType;
tags[2].ti_Data =MMT_PICTURE,
tags[3].ti_Tag = TAG_END;
tags[3].ti_Data =0;

if ((picture = MediaNewObjectTagList(&tags)))
{
int i=0;
data->img.dpi = 150;
if ((metadata = (struct MetaItem *)MediaGetPort(picture, 0, MMA_MetaData)))
{


KPrintF("parsing metadate\n");

while (metadata[i].mi_Length)
{
KPrintF("parsing metadate id %d\n", metadata[i].mi_Id );
if (metadata[i].mi_Id == MMETA_VideoDpiX)
{
double *dpi;
KPrintF("DPI found: %d\n", metadata[i].mi_Length);
dpi = (double*)((metadata[i].mi_Data));
data->img.dpi = *dpi;
KPrintF("DPI: %d\n", data->img.dpi);
break;
}
i++;

}
}

data->img.height = MediaGetPort(picture, 0, MMA_Video_Height);
data->img.width = MediaGetPort(picture, 0, MMA_Video_Width);

//and reading
i= DoMethod(picture, MMM_Pull, 0, ptr, data->img.bytesperline*data->img.height);

@Kronos

1. Reggae has no datatype fallback. The main reason for this is that datatypes cannot do streamed processing.

2. Reggae has no PNG decoder yet.

3. In case of any problems with Reggae, run MediaLogger before running your code, switch log level to "verbose" and check log. It is usually very informative.

Those who need examples on how to use Reggae and/or datatypes can have a look at sources heres :
http://amiga.comscripts.com/phpBB/viewtopic.php?topic=105&forum=2&1

SixK

Quote:
there is no surcecode in the archive ;)

Quote:

To quote a fellow MorphOS-Team-member (no names and no fingerprints) "datatypes actually are obsolete. You should consider using Reggae instead"

Well I guess I have to stick to the obsolete stuff then

Quote:

It's a real shame Reggae still doesn't know about such widespread formats as PNG, not to mention MPEG... As you imply, it's like using a very modern vehicle to actually go backwards. Datatypes should be superseded by this clever MorphOS system component, but many months have passed, and its use is still severely limited.

If I remember correctly, Krashan concentrates in the object framework, and he isn't actually doing codec work. That should be left to others but... Do others exist?

Damn ! You're right ! :(
I thought i had released full source code with Reggae support, but it seem's I never did it ! ;(

In my indexer, I still use Datatypes, when Reggae can't handle the file.

SixK

[ Edited by SixK on 2010/8/10 18:42 ]

Agree, I was already asking for a "driver development kit",
wrapping the png.library should be no problem... right?

After some period of uncertainity now ("now" as "for some months") I'm sure that my MorphOS activity is (and will be) pure hobby with no money involved. While you ("you" plural, as all registered users) treat MorphOS as a commercial product (which is obvious), from my point of view it is just a bedroom coding.

Then Reggae being a pure hobbyist project, is not driven by any schedule or business plan, but mood and weather changes. I know it lacks some features, mainly decoders for some popular formats, but not only.

While I cared much in the past that Reggae is used in new applications, now it does not matter for me that much. If one prefers datatypes, no problem.

Said all that, I can assure you, I will keep developing Reggae in the future, adding new features and new formats. But please don't ask me "why don't you create wxyz decoder, it is just a matter of wrapping libwxyz". Sure, but doing wrappers is just plain boring. Hobby should not be boring. New classes will be properly documented and accompanying tutorials and examples will be added to MorphZone Library. It includes a kind of development kit for writing new classes at some point in the future.

And BTW, MPEG Audio decoder/demuxer is finished. It just waits for MorphOS 2.6. It was almost ready for 2.5, but betatesters reported problems with MPEG recognition routine, there were false positive identifications. Then one of users helped me by writing a scanner identifying all files in a dir recursively and ran it over enormous number of files. Then I was able to refine the recognition code. Detecting MPEG streams is not easy as there is no specific header in them. Then release of these classes had to be delayed and they didn't make into 2.5. Current routine has been tested on over half a million of files and seem to be very robust and precise.

[ Edited by Krashan on 2010/8/10 21:20 ]

Quote:

http://brain.umcs.lublin.pl/~rzookol/classes.html ??

png.decoder exists but required morphos1.4.5 so i have to rewrite it to 2.x

@ Kronos

Are your Reagge attempts mean you're going to reissue SteamDraw?

Quote:

You are very honest to us, thankyou. I understand each and every point you mentioned. And I also believe that you know that, to most of us, Reggae is an "official" component of MorphOS.

Quote:

If I were you, I'd have problems accepting that. If I write a program to do someting better, and people still have to do it the old way...

Quote:

That's great news. Your final task would be to provide tools for others to add codecs. If you do that, I understand the circle is complete. It's just that you don't draw it fully by yourself alone.

Quote:

Understood 100%

Quote:

Just as needed!

Quote:

Oh. What does it need that MorphOS 2.5 doesn't have? Or is it that you prefer releasing it together with the operating system update?

Quote:

Amazing story!

I've added two more small articles about Reggae to MorphZone Library. Not tutorials this time, but some general info. Look here.

Good job Krashan.