+ shared_ptr<AudioBuffers> data = deinterleave_audio (*stream, _frame->data, data_size);
+
+ if (ct < ContentTime ()) {
+ /* Discard audio data that comes before time 0 */
+ Frame const remove = min (int64_t (data->frames()), (-ct).frames_ceil(double((*stream)->frame_rate ())));
+ data->move (remove, 0, data->frames() - remove);
+ data->set_frames (data->frames() - remove);
+ ct += ContentTime::from_frames (remove, (*stream)->frame_rate ());
+ }
+
+ if (data->frames() > 0) {
+ audio (*stream, data, ct);
+ }