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[OpenAL] Fix sourceSeek crash on stopped sources #26770

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[OpenAL] Fix sourceSeek crash on stopped sources #26770

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7e5f797
Fix sourceSeek crash on stopped sources
uniformization Apr 24, 2026
723c98a
Add AL_SEC_OFFSET test for stopped sounds
uniformization Apr 25, 2026
d67e7d8
Add changes according the review
uniformization Apr 25, 2026
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10 changes: 7 additions & 3 deletions src/lib/libopenal.js
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Original file line number Diff line number Diff line change
Expand Up @@ -724,13 +724,17 @@ var LibraryOpenAL = {
AL.setSourceState(src, {{{ cDefs.AL_INITIAL }}});
}

if (src.bufQueue[src.bufsProcessed].audioBuf !== null) {
src.bufsProcessed = 0;
while (offset > src.bufQueue[src.bufsProcessed].audioBuf.duration) {
src.bufsProcessed = 0;
if (src.bufQueue.length > 0 && src.bufQueue[0].audioBuf !== null) {
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while (src.bufsProcessed < src.bufQueue.length && offset > src.bufQueue[src.bufsProcessed].audioBuf.duration) {
offset -= src.bufQueue[src.bufsProcessed].audioBuf.duration;
src.bufsProcessed++;
}

if (src.bufsProcessed >= src.bufQueue.length) {
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src.bufsProcessed = src.bufQueue.length -1;
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}

src.bufOffset = offset;
}

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6 changes: 6 additions & 0 deletions test/openal/test_openal_playback.c
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Expand Up @@ -54,6 +54,9 @@ void playSource(void* arg) {
alSourceStop(source);
alGetSourcei(source, AL_SOURCE_STATE, &state);
assert(state == AL_STOPPED);
alSourcef(source, AL_SEC_OFFSET, 0.5f);
alGetSourcei(source, AL_SOURCE_STATE, &state);
assert(state == AL_STOPPED);
#endif

alSourceRewindv(1, &source);
Expand All @@ -69,6 +72,9 @@ void playSource(void* arg) {
alSourceStopv(1, &source);
alGetSourcei(source, AL_SOURCE_STATE, &state);
assert(state == AL_STOPPED);
alSourcef(source, AL_SEC_OFFSET, 0.5f);
alGetSourcei(source, AL_SOURCE_STATE, &state);
assert(state == AL_STOPPED);
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@sbc100 sbc100 Apr 25, 2026

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Can you confirm this new test fails without this patch?

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@uniformization uniformization Apr 25, 2026 •
edited
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Let me know if the fix for this is good enough or if there's a better way of going about it. When an error is thrown from a function that was called with emscripten_async_call, it won't fail the test. (Line 306)

test_finished();
#endif
}
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