Martin Leese wrote: >> It was more obvious that "where defined" means 1-6 channels, and 7 and >> 8-channel >> files have undefined channel assignment. Now all possible numbers of >> channels have >> defined channel map, so the text should be (IMHO): >> >> 0000-0111 : (number of independent channels)-1. The channel order follows >> SMPTE/ITU-R recommendations. The assignments are as follows: > > Note that the channel order may not be defined.
IMHO it doesn't matter in this place of documentation (which describes default channel assignments for FLAC). > So the WAVEFORMATEXTENSIBLE channel > mask is saved ONLY when the channel order > does not follow SMPTE/ITU-R recommendations. Not quite true. I created two stereo (FL+FR) 24-bit wav files (one with WAVEFORMATEX header, the other with WAVEFORMATEXTENSIBLE header), and encoded them to FLAC. And FLAC creates WAVEFORMATEXTENSIBLE_CHANNEL_MASK tag for the 2nd file (tested on FLAC 1.3.1, 1.2.1, 1.1.4). > Having channel assignments in two different > places is bad practice. In the FLAC spec there > is "1011-1111 : reserved". Why not specify one > of the reserved codes to mean "channel > assignment is specified in the > WAVEFORMATEXTENSIBLE channel mask; go > look there". The problem is how to now specify > the number of channels. The channel mask implicitly contains the number of channels; but such files probably won't be compatible with all existing decoders. What's better: a sound with incorrect channel assignment or no sound at all? _______________________________________________ flac-dev mailing list flac-dev@xiph.org http://lists.xiph.org/mailman/listinfo/flac-dev