linux-arkmicro/buildroot-external/package/hx280enc/software/source/h264/H264Cabac.c

/*------------------------------------------------------------------------------
--                                                                            --
--       This software is confidential and proprietary and may be used        --
--        only as expressly authorized by a licensing agreement from          --
--                                                                            --
--                            Hantro Products Oy.                             --
--                                                                            --
--                   (C) COPYRIGHT 2006 HANTRO PRODUCTS OY                    --
--                            ALL RIGHTS RESERVED                             --
--                                                                            --
--                 The entire notice above must be reproduced                 --
--                  on all copies and should not be removed.                  --
--                                                                            --
--------------------------------------------------------------------------------
-
-  Description : H264 CABAC context table initialization
-
------------------------------------------------------------------------------*/

#include "H264Cabac.h"
#include "H264CabacContext.h"
#include "enccommon.h"
#include "enccfg.h"

#define CLIP3(x,y,z)    (((z) < (x)) ? (x) : (((z) > (y)) ? (y) : (z)))

static void SwapEndianess(u32 * buf, u32 sizeBytes)
{
#if (ENC8290_OUTPUT_SWAP_8 == 1)
    u32 i = 0;
    i32 words = sizeBytes / 4;

    ASSERT((sizeBytes % 8) == 0);

    while(words > 0)
    {
        u32 val = buf[i];
        u32 tmp = 0;

        tmp |= (val & 0xFF) << 24;
        tmp |= (val & 0xFF00) << 8;
        tmp |= (val & 0xFF0000) >> 8;
        tmp |= (val & 0xFF000000) >> 24;

#if(ENC8290_OUTPUT_SWAP_32 == 1)    /* need this for 64-bit HW */
        {
            u32 val2 = buf[i + 1];
            u32 tmp2 = 0;

            tmp2 |= (val2 & 0xFF) << 24;
            tmp2 |= (val2 & 0xFF00) << 8;
            tmp2 |= (val2 & 0xFF0000) >> 8;
            tmp2 |= (val2 & 0xFF000000) >> 24;

            buf[i] = tmp2;
            words--;
            i++;
        }
#endif
        buf[i] = tmp;
        words--;
        i++;
    }
#endif

}

#ifndef H8290_MEMCPY_CABAC_INIT
u32 H264CabacInit(u32 * contextTable, u32 cabac_init_idc)
{
    const i32(*ctx)[460][2];
    int i, j, qp;
    u8 *table = (u8 *) contextTable;

    for(qp = 0; qp < 52; qp++)  /* All QP values */
    {
        for(j = 0; j < 2; j++)  /* Intra/Inter */
        {
            if(j == 0)
                ctx = /*lint -e(545) */ &h264ContextInitIntra;
            else
                ctx = /*lint -e(545) */ &h264ContextInit[cabac_init_idc];

            for(i = 0; i < 460; i++)
            {
                i32 m = (i32) (*ctx)[i][0];
                i32 n = (i32) (*ctx)[i][1];

                i32 preCtxState = CLIP3(1, 126, ((m * (i32) qp) >> 4) + n);

                if(preCtxState <= 63)
                {
                    table[qp * 464 * 2 + j * 464 + i] =
                        (u8) ((63 - preCtxState) << 1);
                }
                else
                {
                    table[qp * 464 * 2 + j * 464 + i] =
                        (u8) (((preCtxState - 64) << 1) | 1);
                }
            }
        }
    }

    SwapEndianess(contextTable, 52 * 2 * 464);
    return 0;
}
#else
u32 H264CabacInit(u32 * contextTable, u32 cabac_init_idc)
{
    const i32(*ctx)[460][2];
    int i, j, qp;

    u8 *tempCabacTable = (u8*)EWLmalloc(52 * 2 * 464);
    if(tempCabacTable == NULL)
    {
        return 1;
    }

    for(qp = 0; qp < 52; qp++) /* All QP values */
    {
        for(j = 0; j < 2; j++) /* Intra/Inter */
        {
            if(j == 0)
                ctx = /*lint -e(545) */ &h264ContextInitIntra;
            else
                ctx = /*lint -e(545) */ &h264ContextInit[cabac_init_idc];

            for(i = 0; i < 460; i++)
            {
                i32 m = (i32) (*ctx)[i][0];
                i32 n = (i32) (*ctx)[i][1];

                i32 preCtxState = CLIP3(1, 126, ((m * (i32) qp) >> 4) + n);

                if(preCtxState <= 63)
                {
                    tempCabacTable [qp * 464 * 2 + j * 464 + i] =
                        (u8) ((63 - preCtxState) << 1);
                }
                else
                {
                    tempCabacTable [qp * 464 * 2 + j * 464 + i] =
                        (u8) (((preCtxState - 64) << 1) | 1);
                }
            }
        }
    }

    SwapEndianess((u32*)tempCabacTable , 52 * 2 * 464);
    EWLmemcpy(contextTable, tempCabacTable, 52 * 2 * 464);
    EWLfree(tempCabacTable);
    return 0;
}
#endif