56 lines · plain
1.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later2 3.. _V4L2-SDR-FMT-PCU20BE:4 5******************************6V4L2_SDR_FMT_PCU20BE ('PC20')7******************************8 9Planar complex unsigned 20-bit big endian IQ sample10 11Description12===========13 14This format contains a sequence of complex number samples. Each complex15number consist of two parts called In-phase and Quadrature (IQ). Both I16and Q are represented as a 20 bit unsigned big endian number stored in1732 bit space. The remaining unused bits within the 32 bit space will be18padded with 0. I value starts first and Q value starts at an offset19equalling half of the buffer size (i.e.) offset = buffersize/2. Out of20the 20 bits, bit 19:2 (18 bit) is data and bit 1:0 (2 bit) can be any21value.22 23**Byte Order.**24Each cell is one byte.25 26.. flat-table::27 :header-rows: 128 :stub-columns: 029 30 * - Offset:31 - Byte B032 - Byte B133 - Byte B234 - Byte B335 * - start + 0:36 - I'\ :sub:`0[19:12]`37 - I'\ :sub:`0[11:4]`38 - I'\ :sub:`0[3:0]; B2[3:0]=pad`39 - pad40 * - start + 4:41 - I'\ :sub:`1[19:12]`42 - I'\ :sub:`1[11:4]`43 - I'\ :sub:`1[3:0]; B2[3:0]=pad`44 - pad45 * - ...46 * - start + offset:47 - Q'\ :sub:`0[19:12]`48 - Q'\ :sub:`0[11:4]`49 - Q'\ :sub:`0[3:0]; B2[3:0]=pad`50 - pad51 * - start + offset + 4:52 - Q'\ :sub:`1[19:12]`53 - Q'\ :sub:`1[11:4]`54 - Q'\ :sub:`1[3:0]; B2[3:0]=pad`55 - pad56