Question about channel map

[xielock]

Is function ma_calculate_channel_position_rectangular_weight() only support ma_standard_channel_map_default channel map? when I try to play a vorbis 5.1 sound, I get only 4 channel. When I change ma_stbvorbis_get_data_format() 's code

    if (pChannelMap != NULL) { ma_channel_map_init_standard(ma_standard_channel_map_vorbis, pChannelMap, channelMapCap, pVorbis->channels);  

to ma_standard_channel_map_default, I can get the expected result.