Data Format - Data Format - 4.0 English - PG140

The C model holds input and output data in multi-dimensional arrays: xip_array_real for input and xip_array_mpz for output.

Data is arranged as a 3D array, where dim[0] is the path (always 1), dim[1] is the number of channels, and dim[2] is the number of samples per channel.

Multiple channels are interleaved in the flat data buffer: all channels of a given sample are stored consecutively before the next sample. For three channels this is:

sample 0        sample 1        sample 2
      c0  c1  c2      c0  c1  c2      c0  c1  c2

The flat index of a given value is therefore (sample * num_channels) + chan.

To access a single value by channel and sample number without computing the flat index, use the helpers:

• xip_cic_v4_0_xip_array_real_set_sample writes an input sample.
• xip_cic_v4_0_xip_array_mpz_get_sample reads an output sample.