Short question: is an ogg-file streamed by sdl_mixer or first loaded completely into memory?

SDL Development
1

Short question: is an ogg-file streamed by sdl_mixer or first loaded
completely into memory?
Just want to know what happens if i allocate multiple Mix_chunks via
Mix_LoadWAV_RW from different ogg-files. Does all the files go into
memory ?
If so, i probably should better play my background music one after
another.

Code snipped:

SDL_RWops * rw=NULL; FILE *fp=NULL;
if(archive->open(fp,“data/music/dr_trance_trance_animal_II_12.ogg”))
{
rw=SDL_RWFromFP(fp, 0);
Mix_Chunk *mix=Mix_LoadWAV_RW(rw,0);
int channel = Mix_PlayChannel(-1, mix, 0); // - 1= first free
unallocated channel_________________________________________

Andre Krause
Dipl. Inf.
Department of Biological Cybernetics
Faculty of Biology
University of Bielefeld
PO Box 10 01 31
33501 Bielefeld
Germany

Phone: +49-521-106-5519
Mobil: +49-177-7465055
Home : +49-521-3044776
Email: @Andre_Krause
ICQ# : 68306404
More ways to contact me: http://wwp.icq.com/68306404
Homepage: http://www.andre-krause.net
http://www.andre-krause.de

War isn’t politics, my dear. It is indeed the only human activity that
is rottener than politics.
RexStout

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2

I was wondering the same thing. In my case, because SDL_LoadMUS_RW is not implemented (or wasn’t at 1.2.4, at least) and I want to read small .ogg files from a resource file - I have to extract the file to disk, load it, and delete it. I do load wave files from a memory RW without problems.

Lic. Gabriel Gambetta
ARTech - GeneXus Development Team
ggambett at artech.com.uy> ----- Original Message -----

From: Andre Krause [mailto:post@andre-krause.net]
Sent: Mi?rcoles, 14 de Mayo de 2003 04:11 p.m.
To: sdl at libsdl.org
Subject: [SDL] Short question: is an ogg-file streamed by sdl_mixer or first loaded completely into memory?

Short question: is an ogg-file streamed by sdl_mixer or first loaded completely into memory? Just want to know what happens if i allocate multiple Mix_chunks via Mix_LoadWAV_RW from different ogg-files. Does all the files go into memory ? If so, i probably should better play my background music one after another.

Code snipped:

SDL_RWops * rw=NULL; FILE *fp=NULL;
if(archive->open(fp,“data/music/dr_trance_trance_animal_II_12.ogg”))
{
rw=SDL_RWFromFP(fp, 0);
Mix_Chunk *mix=Mix_LoadWAV_RW(rw,0);
int channel = Mix_PlayChannel(-1, mix, 0); // - 1= first free unallocated channel

Andre Krause
Dipl. Inf.
Department of Biological Cybernetics
Faculty of Biology
University of Bielefeld
PO Box 10 01 31
33501 Bielefeld
Germany

Phone: +49-521-106-5519
Mobil: +49-177-7465055
Home : +49-521-3044776
Email: post at andre-krause.net
ICQ# : 68306404
More ways to contact me: http://wwp.icq.com/68306404
Homepage: http://www.andre-krause.net
http://www.andre-krause.de

War isn’t politics, my dear. It is indeed the only human activity that is rottener than politics. RexStout _________________________________________

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3

Strange - i do not need to extract my ogg-files. But my archive is not
compressed, just the files concatenated. I simply put the file-pointer
to the correct position in my archive.
I use SDL_LoadWav_RW too for ogg-files - why do you use loadmus ?

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-----Urspr?ngliche Nachricht-----
Gabriel GambettaVon: sdl-admin at libsdl.org [mailto:sdl-admin at libsdl.org] Im Auftrag von
Gesendet: Mittwoch, 14. Mai 2003 21:34
An: sdl at libsdl.org
Betreff: RE: [SDL] Short question: is an ogg-file streamed by sdl_mixer
or first loaded completely into memory?

I was wondering the same thing. In my case, because SDL_LoadMUS_RW is
not implemented (or wasn’t at 1.2.4, at least) and I want to read small
.ogg files from a resource file - I have to extract the file to disk,
load it, and delete it. I do load wave files from a memory RW without
problems.

Lic. Gabriel Gambetta
ARTech - GeneXus Development Team
ggambett at artech.com.uy

----- Original Message -----
From: Andre Krause [mailto:@Andre_Krause]
Sent: Mi?rcoles, 14 de Mayo de 2003 04:11 p.m.
To: sdl at libsdl.org
Subject: [SDL] Short question: is an ogg-file streamed by sdl_mixer or
first loaded completely into memory?

Short question: is an ogg-file streamed by sdl_mixer or first loaded
completely into memory? Just want to know what happens if i allocate
multiple Mix_chunks via Mix_LoadWAV_RW from different ogg-files. Does
all the files go into memory ? If so, i probably should better play my
background music one after another.

Code snipped:

SDL_RWops * rw=NULL; FILE *fp=NULL;
if(archive->open(fp,“data/music/dr_trance_trance_animal_II_12.ogg”))
{
rw=SDL_RWFromFP(fp, 0);
Mix_Chunk *mix=Mix_LoadWAV_RW(rw,0);
int channel = Mix_PlayChannel(-1, mix, 0); // - 1= first free
unallocated channel

Andre Krause
Dipl. Inf.
Department of Biological Cybernetics
Faculty of Biology
University of Bielefeld
PO Box 10 01 31
33501 Bielefeld
Germany

Phone: +49-521-106-5519
Mobil: +49-177-7465055
Home : +49-521-3044776
Email: @Andre_Krause
ICQ# : 68306404
More ways to contact me: http://wwp.icq.com/68306404
Homepage: http://www.andre-krause.net
http://www.andre-krause.de

War isn’t politics, my dear. It is indeed the only human activity that
is rottener than politics. RexStout

I’ve stopped 16.484 spam messages. You can too!
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4

Strange - i do not need to extract my ogg-files. But my archive is not compressed, just the files concatenated.
I simply put the file-pointer to the correct position in my archive.

I have a compressed “filesystem” in a file. That’s why I can’t read them directly. But I could not compress them… only the ogg files. Good idea!

I use SDL_LoadWav_RW too for ogg-files - why do you use loadmus ?

Because I want a Mix_Music and not a Mix_Chunk - I’m using these .oggs as music, not as sound effects. Can I just load the ogg as a chunk and play it as music? Is there any difference between playing it as music or as a sample in another channel, after all?

Lic. Gabriel Gambetta
ARTech - GeneXus Development Team
ggambett at artech.com.uy> ----- Original Message -----

From: Andre Krause [mailto:post@andre-krause.net]
Sent: Mi?rcoles, 14 de Mayo de 2003 04:49 p.m.
To: sdl at libsdl.org
Subject: AW: [SDL] Short question: is an ogg-file streamed by sdl_mixer or first loaded completely into memory?

Strange - i do not need to extract my ogg-files. But my archive is not compressed, just the files concatenated. I simply put the file-pointer to the correct position in my archive.
I use SDL_LoadWav_RW too for ogg-files - why do you use loadmus ?

I’ve stopped 16.484 spam messages. You can too!
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-----Urspr?ngliche Nachricht-----
Von: sdl-admin at libsdl.org [mailto:sdl-admin at libsdl.org] Im Auftrag von Gabriel Gambetta
Gesendet: Mittwoch, 14. Mai 2003 21:34
An: sdl at libsdl.org
Betreff: RE: [SDL] Short question: is an ogg-file streamed by sdl_mixer or first loaded completely into memory?

I was wondering the same thing. In my case, because SDL_LoadMUS_RW is not implemented (or wasn’t at 1.2.4, at least) and I want to read small .ogg files from a resource file - I have to extract the file to disk, load it, and delete it. I do load wave files from a memory RW without problems.

Lic. Gabriel Gambetta
ARTech - GeneXus Development Team
ggambett at artech.com.uy

-----Original Message-----
From: Andre Krause [mailto:post@andre-krause.net]
Sent: Mi?rcoles, 14 de Mayo de 2003 04:11 p.m.
To: sdl at libsdl.org
Subject: [SDL] Short question: is an ogg-file streamed by sdl_mixer or first loaded completely into memory?

Short question: is an ogg-file streamed by sdl_mixer or first loaded completely into memory? Just want to know what happens if i allocate multiple Mix_chunks via Mix_LoadWAV_RW from different ogg-files. Does all the files go into memory ? If so, i probably should better play my background music one after another.

Code snipped:

SDL_RWops * rw=NULL; FILE *fp=NULL;
if(archive->open(fp,“data/music/dr_trance_trance_animal_II_12.ogg”))
{
rw=SDL_RWFromFP(fp, 0);
Mix_Chunk *mix=Mix_LoadWAV_RW(rw,0);
int channel = Mix_PlayChannel(-1, mix, 0); // - 1= first free unallocated channel

Andre Krause
Dipl. Inf.
Department of Biological Cybernetics
Faculty of Biology
University of Bielefeld
PO Box 10 01 31
33501 Bielefeld
Germany

Phone: +49-521-106-5519
Mobil: +49-177-7465055
Home : +49-521-3044776
Email: post at andre-krause.net
ICQ# : 68306404
More ways to contact me: http://wwp.icq.com/68306404
Homepage: http://www.andre-krause.net
http://www.andre-krause.de

War isn’t politics, my dear. It is indeed the only human activity that is rottener than politics. RexStout _________________________________________

I’ve stopped 16.484 spam messages. You can too!
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5

Hmm, i dont know, but it works wonderful - the ogg file is played
without problems. So probably there is no difference at all between a
music and a wav-channel…

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-----Urspr?ngliche Nachricht-----
Gabriel GambettaVon: sdl-admin at libsdl.org [mailto:sdl-admin at libsdl.org] Im Auftrag von
Gesendet: Donnerstag, 15. Mai 2003 15:08
An: sdl at libsdl.org
Betreff: RE: [SDL] Short question: is an ogg-file streamed by sdl_mixer
or first loaded completely into memory?

Strange - i do not need to extract my ogg-files. But my archive is not

compressed, just the files concatenated. I simply put the
file-pointer to the correct position in my archive.

I have a compressed “filesystem” in a file. That’s why I can’t read them
directly. But I could not compress them… only the ogg files. Good
idea!

I use SDL_LoadWav_RW too for ogg-files - why do you use loadmus ?

Because I want a Mix_Music and not a Mix_Chunk - I’m using these .oggs
as music, not as sound effects. Can I just load the ogg as a chunk and
play it as music? Is there any difference between playing it as music or
as a sample in another channel, after all?

Lic. Gabriel Gambetta
ARTech - GeneXus Development Team
ggambett at artech.com.uy

----- Original Message -----
From: Andre Krause [mailto:@Andre_Krause]
Sent: Mi?rcoles, 14 de Mayo de 2003 04:49 p.m.
To: sdl at libsdl.org
Subject: AW: [SDL] Short question: is an ogg-file streamed by sdl_mixer
or first loaded completely into memory?

Strange - i do not need to extract my ogg-files. But my archive is not
compressed, just the files concatenated. I simply put the file-pointer
to the correct position in my archive.
I use SDL_LoadWav_RW too for ogg-files - why do you use loadmus ?

I’ve stopped 16.484 spam messages. You can too!
Get your free, safe spam protection at
http://www.cloudmark.com/spamnetsig/

-----Urspr?ngliche Nachricht-----
Von: sdl-admin at libsdl.org [mailto:sdl-admin at libsdl.org] Im Auftrag von
Gabriel Gambetta
Gesendet: Mittwoch, 14. Mai 2003 21:34
An: sdl at libsdl.org
Betreff: RE: [SDL] Short question: is an ogg-file streamed by sdl_mixer
or first loaded completely into memory?

I was wondering the same thing. In my case, because SDL_LoadMUS_RW is
not implemented (or wasn’t at 1.2.4, at least) and I want to read small
.ogg files from a resource file - I have to extract the file to disk,
load it, and delete it. I do load wave files from a memory RW without
problems.

Lic. Gabriel Gambetta
ARTech - GeneXus Development Team
ggambett at artech.com.uy

-----Original Message-----
From: Andre Krause [mailto:@Andre_Krause]
Sent: Mi?rcoles, 14 de Mayo de 2003 04:11 p.m.
To: sdl at libsdl.org
Subject: [SDL] Short question: is an ogg-file streamed by sdl_mixer or
first loaded completely into memory?

Short question: is an ogg-file streamed by sdl_mixer or first loaded
completely into memory? Just want to know what happens if i allocate
multiple Mix_chunks via Mix_LoadWAV_RW from different ogg-files. Does
all the files go into memory ? If so, i probably should better play my
background music one after another.

Code snipped:

SDL_RWops * rw=NULL; FILE *fp=NULL;
if(archive->open(fp,“data/music/dr_trance_trance_animal_II_12.ogg”))
{
rw=SDL_RWFromFP(fp, 0);
Mix_Chunk *mix=Mix_LoadWAV_RW(rw,0);
int channel = Mix_PlayChannel(-1, mix, 0); // - 1= first free
unallocated channel

Andre Krause
Dipl. Inf.
Department of Biological Cybernetics
Faculty of Biology
University of Bielefeld
PO Box 10 01 31
33501 Bielefeld
Germany

Phone: +49-521-106-5519
Mobil: +49-177-7465055
Home : +49-521-3044776
Email: @Andre_Krause
ICQ# : 68306404
More ways to contact me: http://wwp.icq.com/68306404
Homepage: http://www.andre-krause.net
http://www.andre-krause.de

War isn’t politics, my dear. It is indeed the only human activity that
is rottener than politics. RexStout

I’ve stopped 16.484 spam messages. You can too!
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SDL mailing list
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http://www.libsdl.org/mailman/listinfo/sdl

6

“Andre Krause” writes:

Hmm, i dont know, but it works wonderful - the ogg file is played
without problems. So probably there is no difference at all between a
music and a wav-channel…

Music is streaming (when possible), sfx are not. I.e load a Ogg as a
sound effect and it’s decompressed into memory at load time. If you
use good sound quality and a long song (or worse, more than one song
loaded at once) this can quickly eat up A LOT of memory.

Music on the other hand is read/decoded as needed (other than in
obvious cases when this isn’t possible, such as for mods). Currently
you have to give SDL an actual file for this, as noted.–
[ Below is a random fortune, which is unrelated to the above message. ]
When angry, count four; when very angry, swear.
– Mark Twain, “Pudd’nhead Wilson’s Calendar”

7

Are you really sure ? I did not notice my program eating up 20 mbytes
more mem (that would be the size of the uncompressed ogg) i think the
ogg is loaded as it is and ogg-lib can play from a memory handle.
But i will check this again and watching my memory stats while my pgro
loads !

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-----Urspr?ngliche Nachricht-----
David HedborVon: sdl-admin at libsdl.org [mailto:sdl-admin at libsdl.org] Im Auftrag von
Gesendet: Freitag, 16. Mai 2003 00:42
An: sdl at libsdl.org
Betreff: Re: AW: [SDL] Short question: is an ogg-file streamed by
sdl_mixer or first loaded completely into memory?

“Andre Krause” <@Andre_Krause> writes:

Hmm, i dont know, but it works wonderful - the ogg file is played
without problems. So probably there is no difference at all between a
music and a wav-channel…

Music is streaming (when possible), sfx are not. I.e load a Ogg as a
sound effect and it’s decompressed into memory at load time. If you use
good sound quality and a long song (or worse, more than one song loaded
at once) this can quickly eat up A LOT of memory.

Music on the other hand is read/decoded as needed (other than in obvious
cases when this isn’t possible, such as for mods). Currently you have to
give SDL an actual file for this, as noted.

–
[ Below is a random fortune, which is unrelated to the above message. ]
When angry, count four; when very angry, swear.
– Mark Twain, “Pudd’nhead Wilson’s Calendar”

SDL mailing list
SDL at libsdl.org
http://www.libsdl.org/mailman/listinfo/sdl

8

Ok, i watched my memory-counter: you are right - the ogg file is first
decompressed and goes uncompressed into memory :frowning:

Hopefully sometimes RWOps functionality is implemented for ogg-file -
streaming…
Or is it principally impossible?

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-----Urspr?ngliche Nachricht-----
Andre KrauseVon: sdl-admin at libsdl.org [mailto:sdl-admin at libsdl.org] Im Auftrag von
Gesendet: Freitag, 16. Mai 2003 10:12
An: sdl at libsdl.org
Betreff: AW: AW: [SDL] Short question: is an ogg-file streamed by
sdl_mixer or first loaded completely into memory?

Are you really sure ? I did not notice my program eating up 20 mbytes
more mem (that would be the size of the uncompressed ogg) i think the
ogg is loaded as it is and ogg-lib can play from a memory handle. But i
will check this again and watching my memory stats while my pgro loads !

I’ve stopped 16.484 spam messages. You can too!
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-----Urspr?ngliche Nachricht-----
Von: sdl-admin at libsdl.org [mailto:sdl-admin at libsdl.org] Im Auftrag von
David Hedbor
Gesendet: Freitag, 16. Mai 2003 00:42
An: sdl at libsdl.org
Betreff: Re: AW: [SDL] Short question: is an ogg-file streamed by
sdl_mixer or first loaded completely into memory?

“Andre Krause” <@Andre_Krause> writes:

Hmm, i dont know, but it works wonderful - the ogg file is played
without problems. So probably there is no difference at all between a
music and a wav-channel…

Music is streaming (when possible), sfx are not. I.e load a Ogg as a
sound effect and it’s decompressed into memory at load time. If you use
good sound quality and a long song (or worse, more than one song loaded
at once) this can quickly eat up A LOT of memory.

Music on the other hand is read/decoded as needed (other than in obvious
cases when this isn’t possible, such as for mods). Currently you have to
give SDL an actual file for this, as noted.

–
[ Below is a random fortune, which is unrelated to the above message. ]
When angry, count four; when very angry, swear.
– Mark Twain, “Pudd’nhead Wilson’s Calendar”

SDL mailing list
SDL at libsdl.org
http://www.libsdl.org/mailman/listinfo/sdl

SDL mailing list
SDL at libsdl.org
http://www.libsdl.org/mailman/listinfo/sdl

9

“Andre Krause” writes:

Ok, i watched my memory-counter: you are right - the ogg file is first
decompressed and goes uncompressed into memory :frowning:

Hopefully sometimes RWOps functionality is implemented for ogg-file -
streaming…
Or is it principally impossible?

No it’s very possible, just not very viable for sound effects (imagine
10-20 concurrent effects all decoded live using mp3 or ogg - would use
way too much CPU). However you can play streamed audio using a music
track (still requires the files to be actual files though).–
[ Below is a random fortune, which is unrelated to the above message. ]
Your heart is pure, and your mind clear, and your soul devout.

10

No it’s very possible, just not very viable for sound effects (imagine
10-20 concurrent effects all decoded live using mp3 or ogg - would use
way too much CPU). However you can play streamed audio using a music
track (still requires the files to be actual files though).

Ok, that i do understand. But would it be possible to have a way to
handle over a file pointer instead of a filename to Mix_LoadMUS ?
Because i store my many files in an uncompressed archive, that does
nothing more than appending the files one after another. I have a
function “bool archive.open(FILE*fp, string fname)” that returns me a
filepointer that is placed at the beginning of the file in the archive.
If i could pass this pointer to playmus, i would not need to extract my
ogg - track first (what could be even impossible, if a user tries to run
the game directly from cd)

Is there a way ? I’ve not looked into the source of sdl_mixer too deeply
yet.

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-----Urspr?ngliche Nachricht-----
David HedborVon: sdl-admin at libsdl.org [mailto:sdl-admin at libsdl.org] Im Auftrag von
Gesendet: Freitag, 16. Mai 2003 23:37
An: sdl at libsdl.org
Betreff: Re: AW: AW: [SDL] Short question: is an ogg-file streamed by
sdl_mixer or first loaded completely into memory?

“Andre Krause” <@Andre_Krause> writes:

Ok, i watched my memory-counter: you are right - the ogg file is first

decompressed and goes uncompressed into memory :frowning:

Hopefully sometimes RWOps functionality is implemented for ogg-file -
streaming… Or is it principally impossible?

No it’s very possible, just not very viable for sound effects (imagine
10-20 concurrent effects all decoded live using mp3 or ogg - would use
way too much CPU). However you can play streamed audio using a music
track (still requires the files to be actual files though).

–
[ Below is a random fortune, which is unrelated to the above message. ]
Your heart is pure, and your mind clear, and your soul devout.

SDL mailing list
SDL at libsdl.org
http://www.libsdl.org/mailman/listinfo/sdl