How to specify the loop playback of sections in Alphtab

[hhly]

How to specify the loop playback of sections in Alphtab, such as setting the loop playback of the first section to the second section

[Danielku15]

First find the MasterBars from the Song which indicate the start and end of the range you want to repeat (https://alphatab.net/docs/reference/score).

With the masterBars known you can do something like this:

function setRepeat(api, startMasterBarIndex, endMasterBarIndex) {
    // 1. get master bars from indices
    // https://alphatab.net/docs/reference/score
    const startMasterBar = api.score.masterBars[startMasterBarIndex];
    const endMasterBar = api.score.masterBars[endMasterBarIndex];
    
    // 2. get real playback positions of the masterbars
    // https://alphatab.net/docs/reference/api/tickcache
    const tickCache = api.tickCache;
    const startMasterBarTick = tickCache.getMasterBar(startMasterBar).start;
    const endMasterBarTick = tickCache.getMasterBar(endMasterBar).end;

    // 3. set playback range and activate loop
    // https://alphatab.net/docs/reference/api/playbackrange/
    // https://alphatab.net/docs/reference/api/islooping/
    api.playbackRange = { startTick: startMasterBarTick, endTick: endMasterBarTick };
    api.isLooping = true;
}

[hhly]

thank you