bugGnash - The GNU Flash player - Bugs: bug #35545, Gnash treats zero and negative...


bug #35545: Gnash treats zero and negative repeat value in Sound.start(offset,repeat) incorrectly

Submitted by:  Nutchanon Wetchasit <nachanon>
Submitted on:  Thu 16 Feb 2012 01:30:15 PM UTC  
Category: soundSeverity: 3 - Normal
Release: 0.8.9Status: Fixed
Privacy: PublicAssigned to: None
Open/Closed: Open

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Thu 25 Jul 2013 12:35:49 AM UTC, comment #7:

Fixed in e335377dd7; leaving this open in case anyone would like to make an automated testcase.

Bastiaan Jacques <bjacques>
Project Member
Wed 24 Jul 2013 10:36:19 PM UTC, comment #6:

It might be possible to use the Sound.duration property to detect the number of loops, although avoiding timing problems would be tricky.

Bastiaan Jacques <bjacques>
Project Member
Tue 12 Jun 2012 05:53:06 PM UTC, comment #5:

The self-contained testcase is not to confirm the bug.
The bug is confirmed.

The test is to help further understand the expected behavior, confirm the fix and avoid ever reintroducing it.

Sandro Santilli <strk>
Project Member
Wed 30 May 2012 02:25:20 PM UTC, comment #4:

I think it's not just an testcase issue anymore.
I suspect that some flash game seemed to be affected by this too.

UFO Joe (Flash 6)
In this game, intro sound on each level will be looped, and if you get into landing or crashing, you will get their sound effect looped too.

Pest Attack (Flash 7)
In this game, when you swatted rat, swatting sound will be looped, if you swatted more than one time, it will sounded like a chaos.

Nutchanon Wetchasit <nachanon>
Tue 10 Apr 2012 03:46:53 AM UTC, comment #3:

Sorry about that. I didn't read carefully.

Non-positive repeat values should be treated as "repeat once" if the goal is to mimic Flash.

AJ G <nmodprime>
Tue 10 Apr 2012 02:09:46 AM UTC, comment #2:

I recreated this from git master.

What is expected behavior for repeat 0, -1, and -2?

For 0 I imagine you expect Flash's behavior: repeat once.

AJ G <nmodprime>
Thu 16 Feb 2012 01:41:05 PM UTC, comment #1:

Best bug report ever ! Thank you so much .
So, next step here would be producing a self-contained test.
Not an easy task, but we have a couple about sounds already.

Sandro Santilli <strk>
Project Member
Thu 16 Feb 2012 01:30:15 PM UTC, original submission:

Hello, I have used Gnash 0.8.9 and Gnash 0.8.10 to play flash7 file that tries to invoke sound within ActionScript 2.0, by using this code

snd=new Sound(this);

trace("sound: starting (repeat 0)");

It supposed to play sound from offset '0.0' with repeat value '0' which Flash Player will treat it like a repeat value '1' (aka. play the sound once)

But on Gnash, it was treated as an infinite-looped sound, which was an incorrect behavior.

This is a 'correct' result from Macromedia Flash Player 7
You will notice that sound was played only once.

This is a video result from Gnash 0.8.10
You will notice that sound was looped infinitely, and there was also a gap between loop, which seems to be a symptom of bug #24481 (ActionScript sound loop gap)

These are my dummy flash files (created from Flash MX 2004), accompanied with source code, and also attached here.
(These videos was recorded using soundrepeat.0.swf [SoundRepeat0.as], but other files will behave the same)

Note #1: both zero and negative repeat value was treated by Macromedia Flash Player as it was '1'.

Note #2: both zero and negative repeat value was treated by Gnash as it was an infinite repeat (any negative value will get the same video result as above)

Gnash: gnash_0.8.9-1~lenny and gnash_0.8.10-1~lenny from getgnash.org APT repository (both yield exactly same result)
System: Debian GNU/Linux 5.0 Lenny on i386

Nutchanon Wetchasit <nachanon>


(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

Attach File(s):

Attached Files
file #25071:  soundrepeat.zip added by nachanon (25KiB - application/zip - Dummy test flash files (Flash 7))


Depends on the following items: None found

Items that depend on this one: None found


Carbon-Copy List
  • -unavailable- added by bjacques (Posted a comment)
  • -unavailable- added by nmodprime (Posted a comment)
  • -unavailable- added by strk (Posted a comment)
  • -unavailable- added by nachanon (Submitted the item)

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    Follow 4 latest changes.

    Date Changed By Updated Field Previous Value => Replaced By
    Thu 25 Jul 2013 12:35:49 AM UTCbjacquesStatusConfirmed=>Fixed
    Tue 12 Jun 2012 05:53:06 PM UTCstrkCategoryNone=>sound
    Thu 16 Feb 2012 01:30:15 PM UTCnachanonAttached File-=>Added soundrepeat.zip, #25071

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