Java-Gaming.org Hi !
Featured games (85)
games approved by the League of Dukes
Games in Showcase (611)
Games in Android Showcase (172)
games submitted by our members
Games in WIP (657)
games currently in development
News: Read the Java Gaming Resources, or peek at the official Java tutorials
 
    Home     Help   Search   Login   Register   
Pages: [1]
  ignore  |  Print  
  Slick util OpenAL get song length  (Read 2332 times)
0 Members and 1 Guest are viewing this topic.
Offline roland
« Posted 2012-12-09 04:52:38 »

Hi, I am trying to get the length of a song with OpenAL.
The song streamed rather than fully loaded. I am using .ogg files. A java version of the below code just returns 0.

1  
2  
3  
4  
5  
6  
7  
8  
9  
10  
11  
12  
13  
ALfloat GetBufferLength(ALuint buffer)
{
    ALint size, bits, channels, freq;

    alGetBufferi(buffer, AL_SIZE, &size);
    alGetBufferi(buffer, AL_BITS, &bits);
    alGetBufferi(buffer, AL_CHANNELS, &channels);
    alGetBufferi(buffer, AL_FREQUENCY, &freq);
    if(alGetError() != AL_NO_ERROR)
        return -1.0f;

    return (ALfloat)((ALuint)size/channels/(bits/8)) / (ALfloat)freq;
}


I think it's because the song is streaming? Is there any way to fix this?
thanks,
roland
Offline davedes
« Reply #1 - Posted 2012-12-09 09:01:13 »

Since you're streaming the file in chunks, there is no easy means of determining its full length.

Your options:
a) Hardcode the song length in your Java code as a constant, or include it in a "properties" file alongside your OGG audio.

b) Stream through the file as quickly as you can without playing it to determine its total length. (Will probably not be possible with SlickUtil.)

c) Read up on the OGG spec and parse the headers yourself. Find the end time stamp on the last Ogg page and subtract the starting time stamp from the first Ogg page.

Option A is definitely the easiest.

Offline roland
« Reply #2 - Posted 2012-12-09 10:07:32 »

Thanks davedes Smiley
A combination of a + b sounds good for me, streaming at normal speed and saving the length to a file when the song finishes.
Games published by our own members! Check 'em out!
Legends of Yore - The Casual Retro Roguelike
Offline Riven
« League of Dukes »

« JGO Overlord »


Medals: 1039
Projects: 4
Exp: 16 years


Hand over your head.


« Reply #3 - Posted 2012-12-09 12:03:37 »

1  
alGetBufferi(buffer, AL_BITS, &bits);


AL_BITS most likely returns the number of bits in each audio sample (8 or 16)

Hi, appreciate more people! Σ ♥ = ¾
Learn how to award medals... and work your way up the social rankings!
Pages: [1]
  ignore  |  Print  
 
 
You cannot reply to this message, because it is very, very old.

 
GamerC4 (22 views)
2015-08-22 20:38:50

GamerC4 (21 views)
2015-08-22 20:37:18

GamerC4 (24 views)
2015-08-22 20:37:01

Kefwar (26 views)
2015-08-22 18:07:24

GamerC4 (24 views)
2015-08-22 01:00:24

GamerC4 (37 views)
2015-08-22 01:00:17

GamerC4 (23 views)
2015-08-22 00:57:35

GamerC4 (24 views)
2015-08-22 00:56:59

BurntPizza (29 views)
2015-08-21 01:38:01

KaiHH (43 views)
2015-08-19 15:01:05
Rendering resources
by Roquen
2015-08-17 12:42:29

Rendering resources
by Roquen
2015-08-17 09:36:56

Rendering resources
by Roquen
2015-08-13 07:40:51

Networking Resources
by Roquen
2015-08-13 07:40:43

List of Learning Resources
by gouessej
2015-07-09 11:29:36

How Do I Expand My Game?
by bashfrog
2015-06-14 11:34:43

List of Learning Resources
by PocketCrafter7
2015-05-31 05:37:30

Intersection Methods
by Roquen
2015-05-29 08:19:33
java-gaming.org is not responsible for the content posted by its members, including references to external websites, and other references that may or may not have a relation with our primarily gaming and game production oriented community. inquiries and complaints can be sent via email to the info‑account of the company managing the website of java‑gaming.org
Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines | Managed by Enhanced Four Valid XHTML 1.0! Valid CSS!