Limitless Audio Format
All values are little endian.
|9 bytes||"LIMITLESS" marker|
|Custom headers||Custom headers with their own markers. The "TAGS" marker is reserved for tags in a later specification.|
|4 bytes||"HEAD" marker|
|4 bytes||Channel/object count.|
|9 bytes for each channel/object||
|4 bytes||Sample rate.|
|8 bytes||Total samples.|
|The rest||PCM blocks for each second.|
A PCM block is created for each second of audio. Each block begins with channels/objects / 8 (rounded up) bytes: each bit in this byte array shows if a channel has samples or not in the current block. Bits are high-ordered and right-aligned, while bytes are low-ordered (for 12 channels: 8-7-6-5-4-3-2-1, ----12-11-10-9). After these, the samples follow for each channel which was declared active in the previous byte array, channel by channel for each sample (interlaced, the same way as it's done for RIFF WAVE), in ascending channel order, but only for active channels.
In Channel mode, no checks are required: all channel positions are valid if the transport is valid, and no additional tracks are inserted, everything can be played back.
For object-based exports, extra PCM tracks are used for object movement data. These tracks are marked with the X axis rotation set to NaN. The Y rotation in this case is reserved and shall be 0. One object position track contains movement data for exactly 16 channels. If there are more channels, more object position tracks are added, but if there are less channels left for the last track, it will fill the remaining channels with skipped data, but the alignment must match with a 16-channel position track. The positions follow each other by their index, and the order of the dimensions is width, height, depth.
Position tracks contain the values dimension by dimension, object by object (object 1 X, object 1 Y, object 1 Z, object 2 X...). LAF is using a right-handed Cartesian coordinate system. The bit depth of the content sets the precision of object positions, these values are encoded the exact same way PCM samples are: from -1 to 1 (these limits are the walls of the virtual room), multiplied by the positive integer limit in integer mode. In floating point mode, placing objects over the room's walls is permitted.