ios5 - 如何在Music Player中循环播放Midi

Question

我正在使用以下代码在ios中播放midi文件，但是如何循环播放歌曲？
有没有类似player.loop = true的东西？

NewMusicSequence(&mySequence);
NSURL * midiFileURL = [NSURL fileURLWithPath:midPath];
MusicSequenceFileLoad(mySequence, (__bridge CFURLRef)midiFileURL, 0, kMusicSequenceLoadSMF_ChannelsToTracks);`

NewMusicPlayer(&player);
MusicPlayerSetSequence(player, mySequence);

MusicPlayerPreroll(player);
MusicPlayerStart(player);

提前致谢。

Answer 1

我通过为每个轨道设置循环信息来解决它。

 UInt32 tracks;


if (MusicSequenceGetTrackCount(sequence, &tracks) != noErr)


    for (UInt32 i = 0; i < tracks; i++) {
        MusicTrack track = NULL;
        MusicTimeStamp trackLen = 0;

        UInt32 trackLenLen = sizeof(trackLen);

        MusicSequenceGetIndTrack(sequence, i, &track);

        MusicTrackGetProperty(track, kSequenceTrackProperty_TrackLength, &trackLen, &trackLenLen);
        MusicTrackLoopInfo loopInfo = { trackLen, 0 };
        MusicTrackSetProperty(track, kSequenceTrackProperty_LoopInfo, &loopInfo, sizeof(loopInfo));
        NSLog(@"track length is %f", trackLen);
    }