Rémi Bernon (@rbernon) commented about dlls/winegstreamer/wma_decoder.c:
- return E_NOTIMPL; + struct wma_decoder *decoder = impl_from_IMediaObject(iface); + HRESULT hr; + + TRACE("iface %p, flags %#lx, count %lu, buffers %p, status %p.\n", iface, flags, count, buffers, status); + + if (!decoder->wg_transform) + return DMO_E_TYPE_NOT_SET; + + if ((hr = wg_transform_read_dmo(decoder->wg_transform, buffers)) == MF_E_TRANSFORM_STREAM_CHANGE) + hr = wg_transform_read_dmo(decoder->wg_transform, buffers); + + if (SUCCEEDED(hr)) + { + /* WMA Lossless emits anything from 0 to 12 packets of output for each packet of input */ + buffers[0].dwStatus |= DMO_OUTPUT_DATA_BUFFERF_INCOMPLETE; This doesn't look right. The flag should be set if the buffer was partially read already.
-- https://gitlab.winehq.org/wine/wine/-/merge_requests/4450#note_53046