Re: [sdljava-users] Problem with SDLMixer

[Robert S. <the...@gm...>]

Hi Ivan.

>
> Do you know if we can run a wiki on sourceforge's site?
>
I am not used to sf's site management but I know that the Gnome bindings 
for Java run a Wiki on their sf page. Their home is java-gnome.sf.net .

cu
Robert

> I will add the version API thanks for the suggestion.
>
> -Ivan/
>
> Robert Schuster wrote:
>
>> Hi.
>>
>> Ivan Z. Ganza wrote:
>>
>>> Sweet!  Thank you very much for the patch.  I have integrated this 
>>> code.  That is a really nice way to do it.  I was wracking my brain 
>>> for an elegant solution.
>>
>>
>>
>> Well, one could make sure that the small buffers are really filled to 
>> their maximum before another one is allocated. If the 
>> ReadableByteChannel delivers a megabyte in chunks of 100 bytes then 
>> each small buffer wastes ~900 byte. This is not so nice but I think 
>> this can be fixed.
>>
>>>
>>> Its been tested and the changes are committed to CVS.  I made one 
>>> small change which was to call order(ByteOrder.nativeOrder()) on the 
>>> byte buffers.  I think this is required in the case when the buffers 
>>> might be accessed from the C code.
>>
>>
>>
>> I think we need some PPC-style hardware to test this. AFAIK the 
>> byteorder is only neccessary if Java would do non-byte sized 
>> accesses. Since ReadableByteChannel processes only bytes it should be 
>> ok.
>>
>>>
>>> BTW:  let me know if you want dev access.  Or feel free to keep 
>>> sending me patches as you have them.
>>>
>> Thank you, but I think I have not enough time to contribute regularly 
>> (nor the knowledge about the Swig/SDL trickery). I keep sending 
>> patches to you instead. Now that sdljava's mixer library found its 
>> way into our game this may happen more often :-)
>>
>> If you are interested in seeing (or better hearing) your binding at 
>> work try the latest JNLP of our game which is on the download page of 
>> our project page: freefodder.dev.java.net (the unstable link). Please 
>> read the last paragraph of the latest announcement which describes 
>> how to set the sound output to SDLMixer (or wait some days/weeks 
>> until I fixed the launcher app).
>>
>> Btw: Could you add a version API? It would be nice to retrieve SDL's 
>> version and the version of the binding itself programmatically.
>>
>> cu
>> Robert
>>
>> Btw2: You may want to install a Wiki on your project page. I have 
>> seen that some statements are outdated (requirement for Java1.5 and 
>> SDLMixer 1.2.*5*) and I know that updating the website is extremely 
>> boring and timeconsuming. :-)
>>
>>> Also finally I have moved the location of BufferUtils to 
>>> src/sdljava/util;  it used to be in just "src" which was the wrong 
>>> place.
>>>
>>> Thanks again!
>>> -Ivan/
>>>
>>> Robert Schuster wrote:
>>>
>>>> Great! That was the problem.
>>>>
>>>> Along with that I fixed the problem with the loading of URLs from 
>>>> the net (or arbitrary slow locations). The problem with your 
>>>> implementation was that you asserted that InputStream.available() 
>>>> returns the complete size of the stream. However available() 
>>>> returns only the amount of bytes that can be read without blocking.
>>>>
>>>> I fixed BufferUtil.readInputStream() in the following way:
>>>> I am reading the parts of the stream into separate ByteBuffers 
>>>> until the stream is really finished. Afterwards I merge the buffers 
>>>> into one big buffer and return that.
>>>> The implementation uses Channel.newChannel() to retrieve a 
>>>> ReadableByteChannel which allows a ByteBuffer for its read() 
>>>> method. The behavior of this method is otherwise the same as 
>>>> InputStream.read(). The important bit is that -1 is returned when 
>>>> the end of the stream is reached.
>>>>
>>>> I have attached the patch to this mail. Tell me if the list daemon 
>>>> rips it away to send it to you directly.
>>>>
>>>> If you are using BeanShell try this snippet as a proof of concept:
>>>>
>>>> import sdljava.*;
>>>> import sdljava.mixer.*;
>>>> SDLMain.init(SDLMain.SDL_INIT_AUDIO);
>>>> SDLMixer.openAudio(44100, SDLMixer.AUDIO_S16SYS, 2, 4096);
>>>> imc = SDLMixer.loadWAV(new 
>>>> URL("http://www.barbneal.com/wav/lucy/lucy01.wav"));
>>>> SDLMixer.playChannel(0, imc, 0);
>>>>
>>>> However you can add type information and make that a real Java 
>>>> class, too. :-)
>>>>
>>>> cu
>>>> Robert
>>>>
>>>> Btw: Thanks again for reviving the Java binding for SDL. sdljava is 
>>>> the first library that allows me to do portable sound output in 
>>>> Java without having to sacrifice other useful Java API (like 
>>>> resource loading system which is essential for JNLP!).
>>>>
>>>> Ivan Z. Ganza wrote:
>>>>
>>>>> Make sure you have at least SDL Mixer 1.2.6 as the Mix_LoadMUS_RW 
>>>>> was added for 1.2.6.  Its strange though that you were able to 
>>>>> compile if this function wasn't present.
>>>>>
>>>>> BTW I've found that loading over the network doesn't work, 
>>>>> filebased urls are fine though.  I need to find an example of the 
>>>>> proper way to load a byte stream from a URL....
>>>>>
>>>>> Let me know if this helped.
>>>>> -Ivan/
>>>>>
>>>>> Robert Schuster wrote:
>>>>>
>>>>>> Hi,
>>>>>> I wanted to try the new URL based loading of WAV file and was 
>>>>>> stopped by this:
>>>>>>
>>>>>> java.lang.UnsatisfiedLinkError: 
>>>>>> /home/rob/tmp/lwtest/libsdljava_mixer.so: 
>>>>>> /home/rob/tmp/lwtest/libsdljava_mixer.so: undefined symbol: 
>>>>>> Mix_LoadMUS_RW
>>>>>>        at java.lang.ClassLoader$NativeLibrary.load(Native Method)
>>>>>>        at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1586)
>>>>>>        at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1511)
>>>>>>        at java.lang.Runtime.loadLibrary0(Runtime.java:788)
>>>>>>        at java.lang.System.loadLibrary(System.java:834)
>>>>>>        at sdljava.mixer.SDLMixer.<clinit>(SDLMixer.java:1184)
>>>>>>
>>>>>> I took sdljava from CVS (01.22.05) and compiled all files (using 
>>>>>> Blackdown 1.4.2 for GNU/Linux).
>>>>>>
>>>>>> cu
>>>>>> Robert
>>>>>>
>>>>>>
>>>>>> -------------------------------------------------------
>>>>>> This SF.Net email is sponsored by: IntelliVIEW -- Interactive 
>>>>>> Reporting
>>>>>> Tool for open source databases. Create drag-&-drop reports. Save 
>>>>>> time
>>>>>> by over 75%! Publish reports on the web. Export to DOC, XLS, RTF, 
>>>>>> etc.
>>>>>> Download a FREE copy at http://www.intelliview.com/go/osdn_nl
>>>>>> _______________________________________________
>>>>>> sdljava-users mailing list
>>>>>> sdl...@li...
>>>>>> https://lists.sourceforge.net/lists/listinfo/sdljava-users
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> -------------------------------------------------------
>>>>> This SF.Net email is sponsored by: IntelliVIEW -- Interactive 
>>>>> Reporting
>>>>> Tool for open source databases. Create drag-&-drop reports. Save time
>>>>> by over 75%! Publish reports on the web. Export to DOC, XLS, RTF, 
>>>>> etc.
>>>>> Download a FREE copy at http://www.intelliview.com/go/osdn_nl
>>>>> _______________________________________________
>>>>> sdljava-users mailing list
>>>>> sdl...@li...
>>>>> https://lists.sourceforge.net/lists/listinfo/sdljava-users
>>>>>
>>>>>
>>>> ------------------------------------------------------------------------ 
>>>>
>>>>
>>>> Index: src/util/BufferUtil.java
>>>> ===================================================================
>>>> RCS file: /cvsroot/sdljava/sdljava/src/util/BufferUtil.java,v
>>>> retrieving revision 1.2
>>>> diff -u -r1.2 BufferUtil.java
>>>> --- src/util/BufferUtil.java    7 Jan 2005 03:11:49 -0000    1.2
>>>> +++ src/util/BufferUtil.java    22 Jan 2005 22:20:40 -0000
>>>> @@ -7,15 +7,23 @@
>>>> import java.net.URLConnection;
>>>> import java.net.MalformedURLException;
>>>> import java.nio.ByteBuffer;
>>>> +import java.nio.channels.Channels;
>>>> +import java.nio.channels.ReadableByteChannel;
>>>> +import java.util.Iterator;
>>>> +import java.util.List;
>>>> +import java.util.LinkedList;
>>>>
>>>> /**
>>>>  * Some usefull methods for reading URLs or streams and returning 
>>>> the data as Direct Buffers
>>>>  *
>>>> - * @author  Ivan Z. Ganza
>>>> + * @author Ivan Z. Ganza
>>>> + * @author Robert Schuster
>>>>  * @version $Id: BufferUtil.java,v 1.2 2005/01/07 03:11:49 
>>>> ivan_ganza Exp $
>>>>  */
>>>> public class BufferUtil {
>>>>
>>>> +    private static final int BUFFER_SIZE = 1024;
>>>> +
>>>>     /**
>>>>      * Tries to open the given URL, get its input stream, returns 
>>>> the data in a <I><B>direct</I></B> ByteBuffer
>>>>      *
>>>> @@ -48,14 +56,48 @@
>>>>      * @exception IOException if an error occurs
>>>>      */
>>>>     public static ByteBuffer readInputStream(InputStream in) throws 
>>>> IOException {
>>>> -    int avail  = in.available();
>>>> -    byte buf[] = new byte[avail];
>>>> +            /* Converts the InputStream into a channels which allows
>>>> +             * us to read into a ByteBuffer.
>>>> +             */
>>>> +            ReadableByteChannel    ch = Channels.newChannel(in);
>>>> +   +            // Creates a list that stores the intermediate 
>>>> buffers.
>>>> +            List list = new LinkedList();
>>>>
>>>> -    int read = in.read(buf);
>>>> -    if (read != avail) throw new IOException("needed to read: " + 
>>>> avail + " bytes, but actually read: " + read);
>>>> +            // A variable storing the accumulated size of the data.
>>>> +            int sum = 0, read = 0;
>>>>
>>>> -    ByteBuffer byteBuffer = ByteBuffer.allocateDirect(buf.length);
>>>> -    byteBuffer.put(buf);
>>>> -    return byteBuffer;
>>>> -    }
>>>> -}
>>>> \ No newline at end of file
>>>> +            /* Reads all the bytes from the channel and stores them
>>>> +              * in various buffer objects.
>>>> +             */
>>>> +            do {
>>>> +                ByteBuffer b = 
>>>> ByteBuffer.allocateDirect(BUFFER_SIZE);
>>>> +                read = ch.read(b);
>>>> +
>>>> +                if(read > 0) {
>>>> +                    b.flip(); // make ready for reading later
>>>> +                    list.add(b);
>>>> +                    sum += read;
>>>> +                }
>>>> +            } while(read != -1);
>>>> +
>>>> +            /* If there is only one buffer used we do not
>>>> +             * need to merge the data.
>>>> +             */
>>>> +            if(list.size() == 1) {
>>>> +                return (ByteBuffer) list.get(0);
>>>> +            }
>>>> +
>>>> +            ByteBuffer bb = ByteBuffer.allocateDirect(sum);
>>>> +
>>>> +          /* Merges all buffers into the Buffer bb */
>>>> +            Iterator ite = list.iterator();
>>>> +            while(ite.hasNext()){
>>>> +                bb.put((ByteBuffer) ite.next());
>>>> +            }
>>>> +
>>>> +            list.clear();
>>>> +
>>>> +            return bb;
>>>> +    }
>>>> +}
>>>>  
>>>>
>>>
>>>
>>>
>>> -------------------------------------------------------
>>> This SF.Net email is sponsored by: IntelliVIEW -- Interactive Reporting
>>> Tool for open source databases. Create drag-&-drop reports. Save time
>>> by over 75%! Publish reports on the web. Export to DOC, XLS, RTF, etc.
>>> Download a FREE copy at http://www.intelliview.com/go/osdn_nl
>>> _______________________________________________
>>> sdljava-users mailing list
>>> sdl...@li...
>>> https://lists.sourceforge.net/lists/listinfo/sdljava-users
>>>
>>>
>>
>>
>> -------------------------------------------------------
>> This SF.Net email is sponsored by: IntelliVIEW -- Interactive Reporting
>> Tool for open source databases. Create drag-&-drop reports. Save time
>> by over 75%! Publish reports on the web. Export to DOC, XLS, RTF, etc.
>> Download a FREE copy at http://www.intelliview.com/go/osdn_nl
>> _______________________________________________
>> sdljava-users mailing list
>> sdl...@li...
>> https://lists.sourceforge.net/lists/listinfo/sdljava-users
>
>
>
>
>
> -------------------------------------------------------
> This SF.Net email is sponsored by: IntelliVIEW -- Interactive Reporting
> Tool for open source databases. Create drag-&-drop reports. Save time
> by over 75%! Publish reports on the web. Export to DOC, XLS, RTF, etc.
> Download a FREE copy at http://www.intelliview.com/go/osdn_nl
> _______________________________________________
> sdljava-users mailing list
> sdl...@li...
> https://lists.sourceforge.net/lists/listinfo/sdljava-users
>
>