/******************************************************************************

 *

 * Copyright (C) 2015 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at:

 *

 * http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 *

 *****************************************************************************

 * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore

*/

#include <string.h>

#include "iv_datatypedef.h"

#include "iv.h"

#include "impeg2_buf_mgr.h"

#include "impeg2_disp_mgr.h"

#include "impeg2_defs.h"

#include "impeg2_platform_macros.h"

#include "impeg2_inter_pred.h"

#include "impeg2_idct.h"

#include "impeg2_globals.h"

#include "impeg2_format_conv.h"

#include "impeg2_macros.h"

#include "ivd.h"

#include "impeg2d.h"

#include "impeg2d_bitstream.h"

#include "impeg2d_structs.h"

#include "impeg2d_vld_tables.h"

#include "impeg2d_vld.h"

#include "impeg2d_pic_proc.h"

#include "impeg2d_debug.h"

/*******************************************************************************

* Function name : impeg2d_dec_vld_symbol

*

* Description   : Performs decoding of VLD symbol. It performs decoding by

*                 processing 1 bit at a time

*

* Arguments     :

* stream        : Bitstream

* ai2_code_table     : Table used for decoding

* maxLen        : Maximum Length of the decoded symbol in bits

*

* Value Returned: Decoded symbol

*******************************************************************************/

WORD16 impeg2d_dec_vld_symbol(stream_t *ps_stream,const WORD16 ai2_code_table[][2],  UWORD16 u2_max_len)

{

  UWORD16 u2_data;

  WORD16  u2_end = 0;

  UWORD16 u2_org_max_len = u2_max_len;

  UWORD16 u2_i_bit;

  /* Get the maximum number of bits needed to decode a symbol */

  u2_data = impeg2d_bit_stream_nxt(ps_stream,u2_max_len);

  do

  {

    u2_max_len--;

    /* Read one bit at a time from the variable to decode the huffman code */

    u2_i_bit = (UWORD8)((u2_data >> u2_max_len) & 0x1);

    /* Get the next node pointer or the symbol from the tree */

    u2_end = ai2_code_table[u2_end][u2_i_bit];

  }while(u2_end > 0);

  /* Flush the appropriate number of bits from the ps_stream */

  impeg2d_bit_stream_flush(ps_stream,(UWORD8)(u2_org_max_len - u2_max_len));

  return(u2_end);

}

/*******************************************************************************

* Function name : impeg2d_fast_dec_vld_symbol

*

* Description   : Performs decoding of VLD symbol. It performs decoding by

*                 processing n bits at a time

*

* Arguments     :

* stream        : Bitstream

* ai2_code_table     : Code table containing huffman value

* indexTable    : Index table containing index

* maxLen        : Maximum Length of the decoded symbol in bits

*

* Value Returned: Decoded symbol

*******************************************************************************/

WORD16 impeg2d_fast_dec_vld_symbol(stream_t *ps_stream,

                     const WORD16  ai2_code_table[][2],

                     const UWORD16 au2_indexTable[][2],

                     UWORD16 u2_max_len)

{

    UWORD16 u2_cur_code;

    UWORD16 u2_num_bits;

    UWORD16 u2_vld_offset;

    UWORD16 u2_start_len;

    WORD16  u2_value;

    UWORD16 u2_len;

    UWORD16 u2_huffCode;

    u2_start_len  = au2_indexTable[0][0];

    u2_vld_offset = 0;

    u2_huffCode  = impeg2d_bit_stream_nxt(ps_stream,u2_max_len);

    do

    {

        u2_cur_code = u2_huffCode >> (u2_max_len - u2_start_len);

        u2_num_bits = ai2_code_table[u2_cur_code + u2_vld_offset][0];

        if(u2_num_bits == 0)

        {

            u2_huffCode  &= ((1 << (u2_max_len - u2_start_len)) - 1);

            u2_max_len    -= u2_start_len;

            u2_start_len   = au2_indexTable[ai2_code_table[u2_cur_code + u2_vld_offset][1]][0];

            u2_vld_offset  = au2_indexTable[ai2_code_table[u2_cur_code + u2_vld_offset][1]][1];

        }

        else

        {

            u2_value = ai2_code_table[u2_cur_code + u2_vld_offset][1];

            u2_len   = u2_num_bits;

        }

    }while(u2_num_bits == 0);

    impeg2d_bit_stream_flush(ps_stream,u2_len);

    return(u2_value);

}

/******************************************************************************

*

*  Function Name   : impeg2d_dec_ac_coeff_zero

*

*  Description     : Decodes using Table B.14

*

*  Arguments       : Pointer to VideoObjectLayerStructure

*

*  Values Returned : Decoded value

*

*  Revision History:

*

*         28 02 2002  AR        Creation

*******************************************************************************/

UWORD16 impeg2d_dec_ac_coeff_zero(stream_t *ps_stream, UWORD16* pu2_sym_len, UWORD16* pu2_sym_val)

{

    UWORD16 u2_offset,u2_decoded_value;

    UWORD8  u1_shift;

    UWORD32 u4_bits_read;

    u4_bits_read = (UWORD16)impeg2d_bit_stream_nxt(ps_stream,MPEG2_AC_COEFF_MAX_LEN);

    if ((UWORD16)u4_bits_read >= 0x0800)

    {

        u2_offset = (UWORD16)u4_bits_read >> 11;

    }

    else if ((UWORD16)u4_bits_read >= 0x40)

    {

        u2_offset = 31 + ((UWORD16)u4_bits_read >> 6);

    }

    else if ((UWORD16)u4_bits_read >= 0x20)

    {

        u2_offset = 64;

    }

    else

    {

        u2_offset      = 63;

        u4_bits_read    = (UWORD16)u4_bits_read - 0x10;

    }

    /*-----------------------------------------------------------------------

     * The table gOffset contains both the offset for the group to which the

     * Vld code belongs in the Ac Coeff Table and the no of bits with which

     * the BitsRead should be shifted

     *-----------------------------------------------------------------------*/

    u2_offset = gau2_impeg2d_offset_zero[u2_offset];

    u1_shift  = u2_offset & 0xF;

    /*-----------------------------------------------------------------------

     * Depending upon the vld code, we index exactly to that particular

     * Vld codes value in the Ac Coeff Table.

     * (Offset >> 4)       gives the offset for the group in the AcCoeffTable.

     * (BitsRead >> shift) gives the offset within its group

     *-----------------------------------------------------------------------*/

     u2_offset = (u2_offset >> 4) + ((UWORD16)u4_bits_read >> u1_shift);

    /*-----------------------------------------------------------------------

     * DecodedValue has the Run, Level and the number of bits used by Vld code

     *-----------------------------------------------------------------------*/

    u2_decoded_value = gau2_impeg2d_dct_coeff_zero[u2_offset];

    if(u2_decoded_value == END_OF_BLOCK)

    {

        *pu2_sym_len = 2;

        *pu2_sym_val = EOB_CODE_VALUE;

    }

    else if(u2_decoded_value == ESCAPE_CODE)

    {

        *pu2_sym_len     = u2_decoded_value & 0x1F;

        *pu2_sym_val = ESC_CODE_VALUE;

    }

    else

    {

        *pu2_sym_len = u2_decoded_value & 0x1F;

        *pu2_sym_val = u2_decoded_value >> 5;

    }

    return(u2_decoded_value);

}

/******************************************************************************

*

*  Function Name   : impeg2d_dec_ac_coeff_one

*

*  Description     : Decodes using Table B.15

*

*  Arguments       : Pointer to VideoObjectLayerStructure

*

*  Values Returned : Decoded value

*

*  Revision History:

*

*         28 02 2002  AR        Creation

*******************************************************************************/

UWORD16 impeg2d_dec_ac_coeff_one(stream_t *ps_stream, UWORD16* pu2_sym_len, UWORD16* pu2_sym_val)

{

    UWORD16 u2_offset, u2_decoded_value;

    UWORD8  u1_shift;

    UWORD32 u4_bits_read;

    u4_bits_read = (UWORD16)impeg2d_bit_stream_nxt(ps_stream,MPEG2_AC_COEFF_MAX_LEN);

    if ((UWORD16)u4_bits_read >= 0x8000)

    {

        /* If the MSB of the vld code is 1 */

        if (((UWORD16)u4_bits_read >> 12) == 0xF)

            u2_offset = ((UWORD16)u4_bits_read >> 8) & 0xF;

        else

            u2_offset = (UWORD16)u4_bits_read >> 11;

        u2_offset += gau2_impeg2d_offset_one[0];

    }

    else if ((UWORD16)u4_bits_read >= 0x400)

    {

        u2_offset =(UWORD16) u4_bits_read >> 10;

        u2_offset = gau2_impeg2d_offset_one[u2_offset];

        u1_shift = u2_offset & 0xF;

        u2_offset = (u2_offset >> 4) + ((UWORD16)u4_bits_read >> u1_shift);

    }

    else if ((UWORD16)u4_bits_read >= 0x20)

    {

        u2_offset = ((UWORD16)u4_bits_read >> 5) + 31;

        u2_offset = gau2_impeg2d_offset_one[u2_offset];

        u1_shift = u2_offset & 0xF;

        u2_offset = (u2_offset >> 4) + ((UWORD16)u4_bits_read >> u1_shift);

    }

    else

    {

        u2_offset = gau2_impeg2d_offset_one[63] + ((UWORD16)u4_bits_read & 0xF);

    }

    /*-----------------------------------------------------------------------

    * DecodedValue has the Run, Level and the number of bits used by Vld code

    *-----------------------------------------------------------------------*/

    u2_decoded_value = gau2_impeg2d_dct_coeff_one[u2_offset];

    if(u2_decoded_value == END_OF_BLOCK)

    {

        *pu2_sym_len = 4;

        *pu2_sym_val = EOB_CODE_VALUE;

    }

    else if(u2_decoded_value == ESCAPE_CODE)

    {

        *pu2_sym_len     = u2_decoded_value & 0x1F;

        *pu2_sym_val = ESC_CODE_VALUE;

    }

    else

    {

        *pu2_sym_len = u2_decoded_value & 0x1F;

        *pu2_sym_val = u2_decoded_value >> 5;

    }

    return(u2_decoded_value);

}

/******************************************************************************

 *

 *  Function Name   : impeg2d_vld_inv_quant_mpeg1

 *

 *  Description     : Performs VLD operation for MPEG1/2

 *

 *  Arguments       :

 *  state           : VLCD state parameter

 *  regs            : Registers of VLCD

 *

 *  Values Returned : None

 ******************************************************************************/

IMPEG2D_ERROR_CODES_T impeg2d_vld_inv_quant_mpeg1(

                             void  *pv_dec,           /* Decoder State */

                             WORD16       *pi2_out_addr,       /*!< Address where decoded symbols will be stored */

                             const UWORD8 *pu1_scan,          /*!< Scan table to be used */

                             UWORD16      u2_intra_flag,      /*!< Intra Macroblock or not */

                             UWORD16      u2_colr_comp,      /*!< 0 - Luma,1 - U comp, 2 - V comp */

                             UWORD16      u2_d_picture        /*!< D Picture or not */

                             )

{

    UWORD8  *pu1_weighting_matrix;

    dec_state_t *ps_dec    = (dec_state_t *) pv_dec;

    IMPEG2D_ERROR_CODES_T e_error   = (IMPEG2D_ERROR_CODES_T)IVD_ERROR_NONE;

    WORD16  pi2_coeffs[NUM_COEFFS];

    UWORD8  pu1_pos[NUM_COEFFS];

    WORD32  i4_num_coeffs;

    /* Perform VLD on the stream to get the coefficients and their positions */

    e_error = impeg2d_vld_decode(ps_dec, pi2_coeffs, pu1_scan, pu1_pos, u2_intra_flag,

                                 u2_colr_comp, u2_d_picture, ps_dec->u2_intra_vlc_format,

                                 ps_dec->u2_is_mpeg2, &i4_num_coeffs);

    if ((IMPEG2D_ERROR_CODES_T)IVD_ERROR_NONE != e_error)

    {

        return e_error;

    }

    /* For YUV420 format,Select the weighting matrix according to Table 7.5 */

    pu1_weighting_matrix = (u2_intra_flag == 1) ? ps_dec->au1_intra_quant_matrix:

                    ps_dec->au1_inter_quant_matrix;

    IMPEG2D_IQNT_INP_STATISTICS(pi2_out_addr, ps_dec->u4_non_zero_cols, ps_dec->u4_non_zero_rows);

    /* Inverse Quantize the Output of VLD */

    PROFILE_DISABLE_INVQUANT_IF0

    {

        /* Clear output matrix */

        PROFILE_DISABLE_MEMSET_RESBUF_IF0

        if (1 != (ps_dec->u4_non_zero_cols | ps_dec->u4_non_zero_rows))

        {

            memset(pi2_out_addr, 0, 64 * sizeof(WORD16));

        }

        impeg2d_inv_quant_mpeg1(pi2_out_addr, pu1_weighting_matrix,

                                  ps_dec->u1_quant_scale, u2_intra_flag,

                                  i4_num_coeffs, pi2_coeffs, pu1_pos,

                                  pu1_scan, &ps_dec->u2_def_dc_pred[u2_colr_comp],

                                  ps_dec->u2_intra_dc_precision);

        if (0 != pi2_out_addr[0])

        {

            /* The first coeff might've become non-zero due to intra_dc_decision

             * value. So, check here after inverse quantization.

             */

            ps_dec->u4_non_zero_cols  |= 0x1;

            ps_dec->u4_non_zero_rows  |= 0x1;

        }

    }

    return e_error;

}

/******************************************************************************

  *

  *  Function Name   : impeg2d_vld_inv_quant_mpeg2

  *

  *  Description     : Performs VLD operation for MPEG1/2

  *

  *  Arguments       :

  *  state           : VLCD state parameter

  *  regs            : Registers of VLCD

  *

  *  Values Returned : None

  ******************************************************************************/

IMPEG2D_ERROR_CODES_T impeg2d_vld_inv_quant_mpeg2(

                             void  *pv_dec,           /* Decoder State */

                             WORD16       *pi2_out_addr,       /*!< Address where decoded symbols will be stored */

                             const UWORD8 *pu1_scan,          /*!< Scan table to be used */

                             UWORD16      u2_intra_flag,      /*!< Intra Macroblock or not */

                             UWORD16      u2_colr_comp,      /*!< 0 - Luma,1 - U comp, 2 - V comp */

                             UWORD16      u2_d_picture        /*!< D Picture or not */

                             )

{

    UWORD8  *pu1_weighting_matrix;

    WORD32 i4_sum;

    dec_state_t *ps_dec = (dec_state_t *)pv_dec;

    IMPEG2D_ERROR_CODES_T e_error = (IMPEG2D_ERROR_CODES_T)IVD_ERROR_NONE;

    WORD16  pi2_coeffs[NUM_COEFFS];

    UWORD8  pi4_pos[NUM_COEFFS];

    WORD32  i4_num_coeffs;

    /* Perform VLD on the stream to get the coefficients and their positions */

    e_error = impeg2d_vld_decode(ps_dec, pi2_coeffs, pu1_scan, pi4_pos, u2_intra_flag,

                                 u2_colr_comp, u2_d_picture, ps_dec->u2_intra_vlc_format,

                                 ps_dec->u2_is_mpeg2, &i4_num_coeffs);

    if ((IMPEG2D_ERROR_CODES_T)IVD_ERROR_NONE != e_error)

    {

        return e_error;

    }

    /* For YUV420 format,Select the weighting matrix according to Table 7.5 */

    pu1_weighting_matrix = (u2_intra_flag == 1) ? ps_dec->au1_intra_quant_matrix:

                    ps_dec->au1_inter_quant_matrix;

    /*mismatch control for mpeg2*/

    /* Check if the block has only one non-zero coeff which is DC  */

    ps_dec->i4_last_value_one = 0;

    IMPEG2D_IQNT_INP_STATISTICS(pi2_out_addr, ps_dec->u4_non_zero_cols, ps_dec->u4_non_zero_rows);

    /* Inverse Quantize the Output of VLD */

    PROFILE_DISABLE_INVQUANT_IF0

    {

        /* Clear output matrix */

        PROFILE_DISABLE_MEMSET_RESBUF_IF0

        if (1 != (ps_dec->u4_non_zero_cols | ps_dec->u4_non_zero_rows))

        {

            memset(pi2_out_addr, 0, 64 * sizeof(WORD16));

        }

        i4_sum  = impeg2d_inv_quant_mpeg2(pi2_out_addr, pu1_weighting_matrix,

                                                 ps_dec->u1_quant_scale, u2_intra_flag,

                                                 i4_num_coeffs, pi2_coeffs,

                                                 pi4_pos, pu1_scan,

                                                 &ps_dec->u2_def_dc_pred[u2_colr_comp],

                                                 ps_dec->u2_intra_dc_precision);

        if (0 != pi2_out_addr[0])

        {

            /* The first coeff might've become non-zero due to intra_dc_decision

             * value. So, check here after inverse quantization.

             */

            ps_dec->u4_non_zero_cols  |= 0x1;

            ps_dec->u4_non_zero_rows  |= 0x1;

        }

        if (1 == (ps_dec->u4_non_zero_cols | ps_dec->u4_non_zero_rows))

        {

            ps_dec->i4_last_value_one = 1 - (pi2_out_addr[0] & 1);

        }

        else

        {

            /*toggle last bit if sum is even ,else retain it as it is*/

            pi2_out_addr[63]        ^= (i4_sum & 1);

            if (0 != pi2_out_addr[63])

            {

                ps_dec->u4_non_zero_cols  |= 0x80;

                ps_dec->u4_non_zero_rows  |= 0x80;

            }

        }

    }

    return e_error;

}

/******************************************************************************

*

*  Function Name   : impeg2d_vld_decode

*

*  Description     : Performs VLD operation for MPEG1/2

*

*  Arguments       :

*  state           : VLCD state parameter

*  regs            : Registers of VLCD

*

*  Values Returned : None

******************************************************************************/

IMPEG2D_ERROR_CODES_T impeg2d_vld_decode(

    dec_state_t *ps_dec,

    WORD16      *pi2_outAddr,       /*!< Address where decoded symbols will be stored */

    const UWORD8 *pu1_scan,         /*!< Scan table to be used */

    UWORD8      *pu1_pos,       /*!< Scan table to be used */

    UWORD16     u2_intra_flag,      /*!< Intra Macroblock or not */

    UWORD16     u2_chroma_flag,     /*!< Chroma Block or not */

    UWORD16     u2_d_picture,       /*!< D Picture or not */

    UWORD16     u2_intra_vlc_format, /*!< Intra VLC format */

    UWORD16     u2_mpeg2,          /*!< MPEG-2 or not */

    WORD32      *pi4_num_coeffs /*!< Returns the number of coeffs in block */

    )

{

    UWORD32 u4_sym_len;

    UWORD32 u4_decoded_value;

    WORD32 i4_level_first_byte;

    WORD32  i4_level;

    UWORD32 u4_run, u4_numCoeffs;

    UWORD32 u4_buf;

    UWORD32 u4_buf_nxt;

    UWORD32 u4_offset;

    UWORD32 *pu4_buf_aligned;

    UWORD32 u4_bits;

    stream_t *ps_stream = &ps_dec->s_bit_stream;

    WORD32  u4_pos;

    UWORD32 u4_nz_cols;

    UWORD32 u4_nz_rows;

    *pi4_num_coeffs = 0;

    ps_dec->u4_non_zero_cols = 0;

    ps_dec->u4_non_zero_rows = 0;

    u4_nz_cols = ps_dec->u4_non_zero_cols;

    u4_nz_rows = ps_dec->u4_non_zero_rows;

    GET_TEMP_STREAM_DATA(u4_buf,u4_buf_nxt,u4_offset,pu4_buf_aligned,ps_stream)

    /**************************************************************************/

    /* Decode the DC coefficient in case of Intra block                       */

    /**************************************************************************/

    if(u2_intra_flag)

    {

        WORD32 dc_size;

        WORD32 dc_diff;

        WORD32 maxLen;

        WORD32 idx;

        maxLen = MPEG2_DCT_DC_SIZE_LEN;

        idx = 0;

        if(u2_chroma_flag != 0)

        {

            maxLen += 1;

            idx++;

        }

        {

            WORD16  end = 0;

            UWORD32 maxLen_tmp = maxLen;

            UWORD16 m_iBit;

            /* Get the maximum number of bits needed to decode a symbol */

            IBITS_NXT(u4_buf,u4_buf_nxt,u4_offset,u4_bits,maxLen)

            do

            {

                maxLen_tmp--;

                /* Read one bit at a time from the variable to decode the huffman code */

                m_iBit = (UWORD8)((u4_bits >> maxLen_tmp) & 0x1);

                /* Get the next node pointer or the symbol from the tree */

                end = gai2_impeg2d_dct_dc_size[idx][end][m_iBit];

            }while(end > 0);

            dc_size = end + MPEG2_DCT_DC_SIZE_OFFSET;

            /* Flush the appropriate number of bits from the stream */

            FLUSH_BITS(u4_offset,u4_buf,u4_buf_nxt,(maxLen - maxLen_tmp),pu4_buf_aligned)

        }

        if (dc_size != 0)

        {

            UWORD32 u4_bits;

            IBITS_GET(u4_buf,u4_buf_nxt,u4_offset,u4_bits,pu4_buf_aligned, dc_size)

            dc_diff = u4_bits;

            if ((dc_diff & (1 << (dc_size - 1))) == 0) //v Probably the prediction algo?

                dc_diff -= (1 << dc_size) - 1;

        }

        else

        {

            dc_diff = 0;

        }

        pi2_outAddr[*pi4_num_coeffs]    = dc_diff;

        /* This indicates the position of the coefficient. Since this is the DC

         * coefficient, we put the position as 0.

         */

        pu1_pos[*pi4_num_coeffs]    = pu1_scan[0];

        (*pi4_num_coeffs)++;

        if (0 != dc_diff)

        {

            u4_nz_cols |= 0x01;

            u4_nz_rows |= 0x01;

        }

        u4_numCoeffs = 1;

    }

    /**************************************************************************/

    /* Decoding of first AC coefficient in case of non Intra block            */

    /**************************************************************************/

    else

    {

        /* First symbol can be 1s */

        UWORD32 u4_bits;

        IBITS_NXT(u4_buf,u4_buf_nxt,u4_offset,u4_bits,1)

        if(u4_bits == 1)

        {

            FLUSH_BITS(u4_offset,u4_buf,u4_buf_nxt,1, pu4_buf_aligned)

            IBITS_GET(u4_buf,u4_buf_nxt,u4_offset,u4_bits,pu4_buf_aligned, 1)

            if(u4_bits == 1)

            {

                pi2_outAddr[*pi4_num_coeffs] = -1;

            }

            else

            {

                pi2_outAddr[*pi4_num_coeffs] = 1;

            }

            /* This indicates the position of the coefficient. Since this is the DC

             * coefficient, we put the position as 0.

             */

            pu1_pos[*pi4_num_coeffs]    = pu1_scan[0];

            (*pi4_num_coeffs)++;

            u4_numCoeffs = 1;

            u4_nz_cols |= 0x01;

            u4_nz_rows |= 0x01;

        }

        else

        {

            u4_numCoeffs = 0;

        }

    }

    if (1 == u2_d_picture)

    {

        PUT_TEMP_STREAM_DATA(u4_buf, u4_buf_nxt, u4_offset, pu4_buf_aligned, ps_stream)

        ps_dec->u4_non_zero_cols  = u4_nz_cols;

        ps_dec->u4_non_zero_rows  = u4_nz_rows;

        return ((IMPEG2D_ERROR_CODES_T)IVD_ERROR_NONE);

    }

        if (1 == u2_intra_vlc_format && u2_intra_flag)

        {

            while(1)

            {

                //Putting the impeg2d_dec_ac_coeff_one function inline.

                UWORD32 lead_zeros;

                WORD16 DecodedValue;

                u4_sym_len = 17;

                IBITS_NXT(u4_buf,u4_buf_nxt,u4_offset,u4_bits,u4_sym_len)

                /* There cannot be more than 11 leading zeros in the decoded

                 * symbol. The symbol is only 17 bits long, so we subtract 15.

                 */

                lead_zeros = CLZ(u4_bits) - 15;

                if (lead_zeros > 11)

                {

                    return IMPEG2D_MB_DATA_DECODE_ERR;

                }

                DecodedValue = gau2_impeg2d_tab_one_1_9[u4_bits >> 8];

                u4_sym_len = (DecodedValue & 0xf);

                i4_level = DecodedValue >> 9;

                /* One table lookup */

                if(0 != i4_level)

                {

                    u4_run = ((DecodedValue >> 4) & 0x1f);

                    u4_numCoeffs       += u4_run;

                    if (u4_numCoeffs >= NUM_COEFFS)

                    {

                        return IMPEG2D_MB_TEX_DECODE_ERR;

                    }

                    u4_pos             = pu1_scan[u4_numCoeffs++];

                    pu1_pos[*pi4_num_coeffs]    = u4_pos;

                    FLUSH_BITS(u4_offset,u4_buf,u4_buf_nxt,u4_sym_len,pu4_buf_aligned)

                    pi2_outAddr[*pi4_num_coeffs]    = i4_level;

                    (*pi4_num_coeffs)++;

                }

                else

                {

                    if (DecodedValue == END_OF_BLOCK_ONE)

                    {

                        u4_sym_len = 4;

                        break;

                    }

                    else

                    {

                        /*Second table lookup*/

                        lead_zeros = CLZ(u4_bits) - 20;/* -16 since we are dealing with WORD32 */

                        if (0 != lead_zeros)

                        {

                            u4_bits         = (u4_bits >> (6 - lead_zeros)) & 0x001F;

                            /* Flush the number of bits */

                            if (1 == lead_zeros)

                            {

                                u4_sym_len         = ((u4_bits & 0x18) >> 3) == 2 ? 11:10;

                            }

                            else

                            {

                                u4_sym_len         = 11 + lead_zeros;

                            }

                            /* flushing */

                            FLUSH_BITS(u4_offset,u4_buf,u4_buf_nxt,u4_sym_len,pu4_buf_aligned)

                            /* Calculate the address */

                            u4_bits         = ((lead_zeros - 1) << 5) + u4_bits;

                            DecodedValue    = gau2_impeg2d_tab_one_10_16[u4_bits];

                            u4_run = BITS(DecodedValue, 8,4);

                            i4_level = ((WORD16) DecodedValue) >> 9;

                            u4_numCoeffs       += u4_run;

                            if (u4_numCoeffs >= NUM_COEFFS)

                            {

                                return IMPEG2D_MB_TEX_DECODE_ERR;

                            }

                            u4_pos             = pu1_scan[u4_numCoeffs++];

                            pu1_pos[*pi4_num_coeffs]    = u4_pos;

                            pi2_outAddr[*pi4_num_coeffs]    = i4_level;

                            (*pi4_num_coeffs)++;

                        }

                        /*********************************************************************/

                        /* MPEG2 Escape Code                                                 */

                        /*********************************************************************/

                        else if(u2_mpeg2 == 1)

                        {

                            u4_sym_len         = 6;

                            FLUSH_BITS(u4_offset,u4_buf,u4_buf_nxt,u4_sym_len,pu4_buf_aligned)

                                IBITS_GET(u4_buf,u4_buf_nxt,u4_offset,u4_bits,pu4_buf_aligned,18)

                                u4_decoded_value    = u4_bits;

                            u4_run             = (u4_decoded_value >> 12);

                            i4_level           = (u4_decoded_value & 0x0FFF);

                            if (i4_level)

                                i4_level = (i4_level - ((i4_level & 0x0800) << 1));

                            u4_numCoeffs       += u4_run;

                            if (u4_numCoeffs >= NUM_COEFFS)

                            {

                                return IMPEG2D_MB_TEX_DECODE_ERR;

                            }

                            u4_pos             = pu1_scan[u4_numCoeffs++];

                            pu1_pos[*pi4_num_coeffs]    = u4_pos;

                            pi2_outAddr[*pi4_num_coeffs]    = i4_level;

                            (*pi4_num_coeffs)++;

                        }

                        /*********************************************************************/

                        /* MPEG1 Escape Code                                                 */

                        /*********************************************************************/

                        else

                        {

                            /*-----------------------------------------------------------

                            * MPEG-1 Stream

                            *

                            * <See D.9.3 of MPEG-2> Run-level escape syntax

                            * Run-level values that cannot be coded with a VLC are coded

                            * by the escape code '0000 01' followed by

                            * either a 14-bit FLC (127 <= level <= 127),

                            * or a 22-bit FLC (255 <= level <= 255).

                            * This is described in Annex B,B.5f of MPEG-1.standard

                            *-----------------------------------------------------------*/

                            /*-----------------------------------------------------------

                            * First 6 bits are the value of the Run. Next is First 8 bits

                            * of Level. These bits decide whether it is 14 bit FLC or

                            * 22-bit FLC.

                            *

                            * If( first 8 bits of Level == '1000000' or '00000000')

                            *      then its is 22-bit FLC.

                            * else

                            *      it is 14-bit FLC.

                            *-----------------------------------------------------------*/

                            u4_sym_len         = 6;

                            FLUSH_BITS(u4_offset,u4_buf,u4_buf_nxt,u4_sym_len,pu4_buf_aligned)

                                IBITS_GET(u4_buf,u4_buf_nxt,u4_offset,u4_bits,pu4_buf_aligned,14)

                                u4_decoded_value     = u4_bits;

                            u4_run              = (u4_decoded_value >> 8);

                            i4_level_first_byte = (u4_decoded_value & 0x0FF);

                            if(i4_level_first_byte & 0x7F)

                            {

                                /*-------------------------------------------------------

                                * First 8 bits of level are neither 1000000 nor 00000000

                                * Hence 14-bit FLC (Last 8 bits are used to get level)

                                *

                                *  Level = (msb of Level_First_Byte is 1)?

                                *          Level_First_Byte - 256 : Level_First_Byte

                                *-------------------------------------------------------*/

                                i4_level = (i4_level_first_byte -

                                    ((i4_level_first_byte & 0x80) << 1));

                            }

                            else

                            {

                                /*-------------------------------------------------------

                                * Next 8 bits are either 1000000 or 00000000

                                * Hence 22-bit FLC (Last 16 bits are used to get level)

                                *

                                *  Level = (msb of Level_First_Byte is 1)?

                                *          Level_Second_Byte - 256 : Level_Second_Byte

                                *-------------------------------------------------------*/

                                IBITS_GET(u4_buf,u4_buf_nxt,u4_offset,u4_bits,pu4_buf_aligned,8)

                                    i4_level = u4_bits;

                                i4_level = (i4_level - (i4_level_first_byte << 1));

                            }

                            u4_numCoeffs += u4_run;

                            if (u4_numCoeffs >= NUM_COEFFS)

                            {

                                return IMPEG2D_MB_TEX_DECODE_ERR;

                            }

                            u4_pos = pu1_scan[u4_numCoeffs++];

                            pu1_pos[*pi4_num_coeffs]    = u4_pos;

                            pi2_outAddr[*pi4_num_coeffs]    = i4_level;

                            (*pi4_num_coeffs)++;

                        }

                    }

                }

                u4_nz_cols |= 1 << (u4_pos & 0x7);

                u4_nz_rows |= 1 << (u4_pos >> 0x3);

            }

            IBITS_GET(u4_buf,u4_buf_nxt,u4_offset,u4_bits,pu4_buf_aligned,u4_sym_len)

        }

        else

        {

            // Inline

            while(1)

            {

                UWORD32 lead_zeros;

                UWORD16 DecodedValue;

                u4_sym_len = 17;

                IBITS_NXT(u4_buf, u4_buf_nxt, u4_offset, u4_bits, u4_sym_len)

                /* There cannot be more than 11 leading zeros in the decoded

                 * symbol. The symbol is only 17 bits long, so we subtract 15.

                 */

                lead_zeros = CLZ(u4_bits) - 15;

                if (lead_zeros > 11)

                {

                    return IMPEG2D_MB_DATA_DECODE_ERR;

                }

                DecodedValue = gau2_impeg2d_tab_zero_1_9[u4_bits >> 8];

                u4_sym_len = BITS(DecodedValue, 3, 0);

                i4_level = ((WORD16) DecodedValue) >> 9;

                if (0 != i4_level)

                {

                    u4_run = BITS(DecodedValue, 8,4);

                    u4_numCoeffs       += u4_run;

                    if (u4_numCoeffs >= NUM_COEFFS)

                    {

                        return IMPEG2D_MB_TEX_DECODE_ERR;

                    }

                    u4_pos                 = pu1_scan[u4_numCoeffs++];

                    pu1_pos[*pi4_num_coeffs]    = u4_pos;

                    FLUSH_BITS(u4_offset,u4_buf,u4_buf_nxt,u4_sym_len,pu4_buf_aligned)

                    pi2_outAddr[*pi4_num_coeffs]    = i4_level;

                    (*pi4_num_coeffs)++;

                }

                else

                {

                    if(DecodedValue == END_OF_BLOCK_ZERO)

                    {

                        u4_sym_len = 2;

                        break;

                    }

                    else

                    {

                        lead_zeros = CLZ(u4_bits) - 20;/* -15 since we are dealing with WORD32 */

                        /*Second table lookup*/

                        if (0 != lead_zeros)

                        {

                            u4_bits         = (u4_bits >> (6 - lead_zeros)) & 0x001F;

                            /* Flush the number of bits */

                            u4_sym_len         = 11 + lead_zeros;

                            /* Calculate the address */

                            u4_bits         = ((lead_zeros - 1) << 5) + u4_bits;

                            DecodedValue    = gau2_impeg2d_tab_zero_10_16[u4_bits];

                            u4_run = BITS(DecodedValue, 8,4);

                            i4_level = ((WORD16) DecodedValue) >> 9;

                            u4_numCoeffs       += u4_run;

                            if (u4_numCoeffs >= NUM_COEFFS)

                            {

                                return IMPEG2D_MB_TEX_DECODE_ERR;

                            }

                            u4_pos                 = pu1_scan[u4_numCoeffs++];

                            pu1_pos[*pi4_num_coeffs]    = u4_pos;

                            if (1 == lead_zeros)

                                u4_sym_len--;

                            /* flushing */

                            FLUSH_BITS(u4_offset,u4_buf,u4_buf_nxt,u4_sym_len,pu4_buf_aligned)

                            pi2_outAddr[*pi4_num_coeffs]    = i4_level;

                            (*pi4_num_coeffs)++;

                        }

                        /*Escape Sequence*/

                        else if(u2_mpeg2 == 1)

                        {

                            u4_sym_len         = 6;

                            FLUSH_BITS(u4_offset,u4_buf,u4_buf_nxt,u4_sym_len,pu4_buf_aligned)

                            IBITS_GET(u4_buf,u4_buf_nxt,u4_offset,u4_bits,pu4_buf_aligned,18)

                            u4_decoded_value    = u4_bits;

                            u4_run             = (u4_decoded_value >> 12);

                            i4_level           = (u4_decoded_value & 0x0FFF);

                            if (i4_level)

                                i4_level = (i4_level - ((i4_level & 0x0800) << 1));

                            u4_numCoeffs           += u4_run;

                            if (u4_numCoeffs >= NUM_COEFFS)

                            {

                                return IMPEG2D_MB_TEX_DECODE_ERR;

                            }

                            u4_pos                 = pu1_scan[u4_numCoeffs++];

                            pu1_pos[*pi4_num_coeffs]    = u4_pos;

                            pi2_outAddr[*pi4_num_coeffs]    = i4_level;

                            (*pi4_num_coeffs)++;

                        }

                        /*********************************************************************/

                        /* MPEG1 Escape Code                                                 */

                        /*********************************************************************/

                        else

                        {

                            /*-----------------------------------------------------------

                            * MPEG-1 Stream

                            *

                            * <See D.9.3 of MPEG-2> Run-level escape syntax

                            * Run-level values that cannot be coded with a VLC are coded

                            * by the escape code '0000 01' followed by

                            * either a 14-bit FLC (127 <= level <= 127),

                            * or a 22-bit FLC (255 <= level <= 255).

                            * This is described in Annex B,B.5f of MPEG-1.standard

                            *-----------------------------------------------------------*/

                            /*-----------------------------------------------------------

                            * First 6 bits are the value of the Run. Next is First 8 bits

                            * of Level. These bits decide whether it is 14 bit FLC or

                            * 22-bit FLC.

                            *

                            * If( first 8 bits of Level == '1000000' or '00000000')

                            *      then its is 22-bit FLC.

                            * else

                            *      it is 14-bit FLC.

                            *-----------------------------------------------------------*/

                            u4_sym_len             = 6;

                            FLUSH_BITS(u4_offset,u4_buf,u4_buf_nxt,u4_sym_len,pu4_buf_aligned)

                            IBITS_GET(u4_buf,u4_buf_nxt,u4_offset,u4_bits,pu4_buf_aligned,14)

                            u4_decoded_value        = u4_bits;

                            u4_run                 = (u4_decoded_value >> 8);

                            i4_level_first_byte    = (u4_decoded_value & 0x0FF);

                            if(i4_level_first_byte & 0x7F)

                            {

                                /*-------------------------------------------------------

                                * First 8 bits of level are neither 1000000 nor 00000000

                                * Hence 14-bit FLC (Last 8 bits are used to get level)

                                *

                                *  Level = (msb of Level_First_Byte is 1)?

                                *          Level_First_Byte - 256 : Level_First_Byte

                                *-------------------------------------------------------*/

                                i4_level = (i4_level_first_byte -

                                    ((i4_level_first_byte & 0x80) << 1));

                            }

                            else

                            {

                                /*-------------------------------------------------------

                                * Next 8 bits are either 1000000 or 00000000

                                * Hence 22-bit FLC (Last 16 bits are used to get level)

                                *

                                *  Level = (msb of Level_First_Byte is 1)?

                                *          Level_Second_Byte - 256 : Level_Second_Byte

                                *-------------------------------------------------------*/

                                IBITS_GET(u4_buf,u4_buf_nxt,u4_offset,u4_bits,pu4_buf_aligned,8)

                                i4_level = u4_bits;

                                i4_level = (i4_level - (i4_level_first_byte << 1));

                            }

                            u4_numCoeffs           += u4_run;

                            if (u4_numCoeffs >= NUM_COEFFS)

                            {

                                return IMPEG2D_MB_TEX_DECODE_ERR;

                            }

                            u4_pos                 = pu1_scan[u4_numCoeffs++];

                            pu1_pos[*pi4_num_coeffs]    = u4_pos;

                            pi2_outAddr[*pi4_num_coeffs]    = i4_level;

                            (*pi4_num_coeffs)++;

                        }

                    }

                }

                u4_nz_cols |= 1 << (u4_pos & 0x7);

                u4_nz_rows |= 1 << (u4_pos >> 0x3);

            }

            IBITS_GET(u4_buf,u4_buf_nxt,u4_offset,u4_bits,pu4_buf_aligned,u4_sym_len)

        }

        PUT_TEMP_STREAM_DATA(u4_buf, u4_buf_nxt, u4_offset, pu4_buf_aligned, ps_stream)

        ps_dec->u4_non_zero_cols  = u4_nz_cols;

        ps_dec->u4_non_zero_rows  = u4_nz_rows;

            return (IMPEG2D_ERROR_CODES_T)IVD_ERROR_NONE;

}

/*****************************************************************************/

/*                                                                           */

/*  Function Name : impeg2d_inv_quant_mpeg1                                   */

/*                                                                           */

/*  Description   : Inverse quantizes the output of VLD                      */

/*                                                                           */

/*  Inputs        :                                                          */