.. -*- coding: utf-8; mode: rst -*- .. _V4L2-SDR-FMT-PCU18BE: ****************************** V4L2_SDR_FMT_PCU18BE ('PC18') ****************************** Planar complex unsigned 18-bit big endian IQ sample Description =========== This format contains a sequence of complex number samples. Each complex number consist of two parts called In-phase and Quadrature (IQ). Both I and Q are represented as a 18 bit unsigned big endian number stored in 32 bit space. The remaining unused bits within the 32 bit space will be padded with 0. I value starts first and Q value starts at an offset equalling half of the buffer size (i.e.) offset = buffersize/2. Out of the 18 bits, bit 17:2 (16 bit) is data and bit 1:0 (2 bit) can be any value. **Byte Order.** Each cell is one byte. .. flat-table:: :header-rows: 1 :stub-columns: 0 * - Offset: - Byte B0 - Byte B1 - Byte B2 - Byte B3 * - start + 0: - I'\ :sub:`0[17:10]` - I'\ :sub:`0[9:2]` - I'\ :sub:`0[1:0]; B2[5:0]=pad` - pad * - start + 4: - I'\ :sub:`1[17:10]` - I'\ :sub:`1[9:2]` - I'\ :sub:`1[1:0]; B2[5:0]=pad` - pad * - ... * - start + offset: - Q'\ :sub:`0[17:10]` - Q'\ :sub:`0[9:2]` - Q'\ :sub:`0[1:0]; B2[5:0]=pad` - pad * - start + offset + 4: - Q'\ :sub:`1[17:10]` - Q'\ :sub:`1[9:2]` - Q'\ :sub:`1[1:0]; B2[5:0]=pad` - pad