Question

Imagine this function:

void SoundManager::playSource(ALuint sourceID, float offset) {     alSourceStop(sourceID);      ALint iTotal = 0;     ALint iCurrent = 0;     ALint uiBuffer = 0;     alGetSourcei(sourceID, AL_BUFFER, &uiBuffer);     alGetBufferi(uiBuffer, AL_SIZE, &iTotal);     iCurrent = iTotal * offset;      alSourcei(sourceID, AL_BYTE_OFFSET, iCurrent);     alSourcePlay(sourceID); } 

The idea is calling playSource(x, 0.5f) would jump to (roughly) halfway through the buffer, etc.

It works fine the first time I call it, but if I call it again on the same source (whether that source is playing or not) it begins playing as though I’d called it with offset 0.

Any ideas why?

Answer 1

Solved!

Even though the API claims that setting the offsets works on sources in any state, the problem was I should have been calling alSourceRewind instead of alSourceStop at the start.

It seems setting offsets only works on sources in the AL_INITIAL state.