theora-fpga/testbenchs/expandblock/reconpixelindex.vhd

   1 library std;
   2 library ieee;
   3 use ieee.std_logic_1164.all;
   4 use ieee.numeric_std.all;
   5
   6 entity ReconPixelIndex is
   7
   8   generic (
   9     RPI_POS_WIDTH           : positive := 17;
  10     HV_FRAG_WIDTH           : positive := 8;
  11     Y_STRIDE_WIDTH          : positive := 12;
  12     UV_STRIDE_WIDTH         : positive := 11;
  13     Y_PL_FRAG_WIDTH         : positive := 21;
  14     UV_PL_FRAG_WIDTH        : positive := 19;
  15     RECON_Y_DATA_OFS_WIDTH  : positive := 20;
  16     RECON_UV_DATA_OFS_WIDTH : positive := 20
  17
  18     );
  19
  20   port (
  21     rpi_position : in unsigned(RPI_POS_WIDTH-1 downto 0);
  22     HFragments : in unsigned(HV_FRAG_WIDTH-1 downto 0);
  23     VFragments : in unsigned(HV_FRAG_WIDTH-1 downto 0);
  24     YStride    : in unsigned(Y_STRIDE_WIDTH-1 downto 0);
  25     UVStride   : in unsigned(UV_STRIDE_WIDTH-1 downto 0);
  26     YPlaneFragments : in unsigned(Y_PL_FRAG_WIDTH-1 downto 0);
  27     UVPlaneFragments : in unsigned(UV_PL_FRAG_WIDTH-1 downto 0);
  28     ReconYDataOffset : in unsigned(RECON_Y_DATA_OFS_WIDTH-1 downto 0);
  29     ReconUDataOffset : in unsigned(RECON_UV_DATA_OFS_WIDTH-1 downto 0);
  30     ReconVDataOffset : in unsigned(RECON_UV_DATA_OFS_WIDTH-1 downto 0);
  31
  32     rpi_value : out signed(31 downto 0)
  33     );
  34 end ReconPixelIndex;
  35
  36 architecture a_ReconPixelIndex of ReconPixelIndex is
  37   constant VFRAGPIXELS : unsigned(3 downto 0) := x"8";
  38   constant HFRAGPIXELS : unsigned(3 downto 0) := x"8";
  39
  40 begin  -- a_ReconPixelIndex
  41
  42   rpi_value <=
  43     resize(
  44       signed(
  45
  46         ((rpi_position / HFragments) * VFRAGPIXELS * YStride) +
  47         ((rpi_position mod HFragments) * HFRAGPIXELS) +
  48         ReconYDataOffset), 32)
  49     when rpi_position < YPlaneFragments else
  50     resize(
  51       signed(
  52         (((rpi_position - YPlaneFragments) / SHIFT_RIGHT(HFragments, 1)) * VFRAGPIXELS * UVStride) +
  53         (((rpi_position - YPlaneFragments) mod SHIFT_RIGHT(HFragments, 1)) * HFRAGPIXELS) +
  54         ReconUDataOffset), 32)
  55     when rpi_position < YPlaneFragments + UVPlaneFragments else
  56     resize(
  57       signed(
  58         (((rpi_position - (YPlaneFragments + UVPlaneFragments))/ SHIFT_RIGHT(HFragments, 1)) * VFRAGPIXELS * UVStride) +
  59         (((rpi_position - (YPlaneFragments + UVPlaneFragments)) mod SHIFT_RIGHT(HFragments, 1)) * HFRAGPIXELS) +
  60         ReconVDataOffset), 32);
  61
  62 end a_ReconPixelIndex;