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253 lines
11 KiB
253 lines
11 KiB
/******************************************************************************
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*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*****************************************************************************
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* Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
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*/
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#include "iv_datatypedef.h"
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#include "impeg2_defs.h"
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#include "impeg2_globals.h"
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#include "impeg2_platform_macros.h"
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#include "impeg2_inter_pred.h"
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#include "impeg2_idct.h"
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#include "impeg2_mem_func.h"
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#include "impeg2_format_conv.h"
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#include "impeg2_disp_mgr.h"
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#include "impeg2_buf_mgr.h"
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#include "impeg2d.h"
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#include "impeg2d_bitstream.h"
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#include "impeg2d_structs.h"
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#include "impeg2d_vld.h"
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#include "impeg2d_vld_tables.h"
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#define BLK_SIZE 8
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#define LUMA_BLK_SIZE (2 * (BLK_SIZE))
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#define CHROMA_BLK_SIZE (BLK_SIZE)
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/*****************************************************************************/
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/* */
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/* Function Name : impeg2d_get_luma_dc_diff */
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/* */
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/* Description : Decode the DC differential value from the bitstream for */
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/* luma block */
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/* */
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/* Inputs : stream - Input stream */
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/* */
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/* Globals : None */
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/* */
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/* Processing : Decode the vlc for dc_diff */
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/* */
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/* Outputs : dc_diff - dc differential used in dc prediction */
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/* */
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/* Returns : dc_diff - dc differential used in dc prediction */
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/* */
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/* Issues : None */
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/* */
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/* Revision History: */
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/* */
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/* DD MM YYYY Author(s) Changes */
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/* 14 09 2005 Harish M First Version */
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/* */
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/*****************************************************************************/
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WORD16 impeg2d_get_luma_dc_diff(stream_t *ps_stream)
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{
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UWORD16 u2_dc_size;
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WORD16 i2_dc_diff;
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u2_dc_size = impeg2d_dec_vld_symbol(ps_stream,gai2_impeg2d_dct_dc_size[0],
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MPEG2_DCT_DC_LUMA_SIZE_LEN) +
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MPEG2_DCT_DC_SIZE_OFFSET;
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if (u2_dc_size != 0)
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{
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i2_dc_diff = impeg2d_bit_stream_get(ps_stream,u2_dc_size);
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if ((i2_dc_diff & (1 << (u2_dc_size - 1))) == 0)
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i2_dc_diff -= (1 << u2_dc_size) - 1;
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}
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else
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{
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i2_dc_diff = 0;
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}
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return i2_dc_diff;
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}
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/*****************************************************************************/
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/* */
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/* Function Name : impeg2d_get_chroma_dc_diff */
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/* */
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/* Description : Decode the DC differential value from the bitstream for */
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/* chroma block */
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/* */
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/* Inputs : stream - Input stream */
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/* */
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/* Globals : None */
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/* */
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/* Processing : Decode the vlc for dc_diff */
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/* */
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/* Outputs : dc_diff - dc differential used in dc prediction */
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/* */
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/* Returns : dc_diff - dc differential used in dc prediction */
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/* */
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/* Issues : None */
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/* */
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/* Revision History: */
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/* */
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/* DD MM YYYY Author(s) Changes */
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/* 14 09 2005 Harish M First Version */
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/* */
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/*****************************************************************************/
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WORD16 impeg2d_get_chroma_dc_diff(stream_t *ps_stream)
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{
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UWORD16 u2_dc_size;
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WORD16 i2_dc_diff;
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u2_dc_size = impeg2d_dec_vld_symbol(ps_stream,gai2_impeg2d_dct_dc_size[1],
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MPEG2_DCT_DC_CHROMA_SIZE_LEN) +
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MPEG2_DCT_DC_SIZE_OFFSET;
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if (u2_dc_size != 0)
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{
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i2_dc_diff = impeg2d_bit_stream_get(ps_stream,u2_dc_size);
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if ((i2_dc_diff & (1 << (u2_dc_size - 1))) == 0)
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i2_dc_diff -= (1 << u2_dc_size) - 1;
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}
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else
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{
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i2_dc_diff = 0;
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}
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return i2_dc_diff;
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}
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/*******************************************************************************
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* Function Name : impeg2d_dec_d_slice
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*
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* Description : Decodes I slice
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*
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* Arguments :
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* dec : Decoder state
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*
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* Values Returned : None
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*******************************************************************************/
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IMPEG2D_ERROR_CODES_T impeg2d_dec_d_slice(dec_state_t *ps_dec)
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{
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UWORD32 i;
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yuv_buf_t *ps_cur_frm_buf = &ps_dec->s_cur_frm_buf;
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stream_t *ps_stream = &ps_dec->s_bit_stream;
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UWORD8 *pu1_vld_buf;
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WORD16 i2_dc_diff;
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UWORD32 u4_frame_width = ps_dec->u2_frame_width;
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UWORD32 u4_frm_offset = 0;
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if(ps_dec->u2_picture_structure != FRAME_PICTURE)
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{
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u4_frame_width <<= 1;
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if(ps_dec->u2_picture_structure == BOTTOM_FIELD)
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{
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u4_frm_offset = ps_dec->u2_frame_width;
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}
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}
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do
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{
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UWORD32 u4_x_offset, u4_y_offset;
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UWORD32 u4_blk_pos;
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WORD16 i2_dc_val;
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UWORD32 u4_dst_x_offset = u4_frm_offset + (ps_dec->u2_mb_x << 4);
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UWORD32 u4_dst_y_offset = (ps_dec->u2_mb_y << 4) * u4_frame_width;
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UWORD8 *pu1_vld_buf8 = ps_cur_frm_buf->pu1_y + u4_dst_x_offset + u4_dst_y_offset;
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UWORD32 u4_dst_wd = u4_frame_width;
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/*------------------------------------------------------------------*/
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/* Discard the Macroblock stuffing in case of MPEG-1 stream */
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/*------------------------------------------------------------------*/
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while(impeg2d_bit_stream_nxt(ps_stream,MB_STUFFING_CODE_LEN) == MB_STUFFING_CODE &&
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ps_stream->u4_offset < ps_stream->u4_max_offset)
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impeg2d_bit_stream_flush(ps_stream,MB_STUFFING_CODE_LEN);
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/*------------------------------------------------------------------*/
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/* Flush 2 bits from bitstream [MB_Type and MacroBlockAddrIncrement]*/
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/*------------------------------------------------------------------*/
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impeg2d_bit_stream_flush(ps_stream,1);
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if(impeg2d_bit_stream_get(ps_stream, 1) != 0x01)
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{
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/* Ignore and continue decoding. */
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}
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/* Process LUMA blocks of the MB */
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for(i = 0; i < NUM_LUMA_BLKS; ++i)
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{
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u4_x_offset = gai2_impeg2_blk_x_off[i];
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u4_y_offset = gai2_impeg2_blk_y_off_frm[i] ;
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u4_blk_pos = (u4_y_offset * u4_dst_wd) + u4_x_offset;
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pu1_vld_buf = pu1_vld_buf8 + u4_blk_pos;
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i2_dc_diff = impeg2d_get_luma_dc_diff(ps_stream);
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i2_dc_val = ps_dec->u2_def_dc_pred[Y_LUMA] + i2_dc_diff;
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ps_dec->u2_def_dc_pred[Y_LUMA] = i2_dc_val;
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i2_dc_val = CLIP_U8(i2_dc_val);
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ps_dec->pf_memset_8bit_8x8_block(pu1_vld_buf, i2_dc_val, u4_dst_wd);
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}
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/* Process U block of the MB */
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u4_dst_x_offset >>= 1;
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u4_dst_y_offset >>= 2;
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u4_dst_wd >>= 1;
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pu1_vld_buf = ps_cur_frm_buf->pu1_u + u4_dst_x_offset + u4_dst_y_offset;
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i2_dc_diff = impeg2d_get_chroma_dc_diff(ps_stream);
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i2_dc_val = ps_dec->u2_def_dc_pred[U_CHROMA] + i2_dc_diff;
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ps_dec->u2_def_dc_pred[U_CHROMA] = i2_dc_val;
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i2_dc_val = CLIP_U8(i2_dc_val);
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ps_dec->pf_memset_8bit_8x8_block(pu1_vld_buf, i2_dc_val, u4_dst_wd);
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/* Process V block of the MB */
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pu1_vld_buf = ps_cur_frm_buf->pu1_v + u4_dst_x_offset + u4_dst_y_offset;
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i2_dc_diff = impeg2d_get_chroma_dc_diff(ps_stream);
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i2_dc_val = ps_dec->u2_def_dc_pred[V_CHROMA] + i2_dc_diff;
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ps_dec->u2_def_dc_pred[V_CHROMA] = i2_dc_val;
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i2_dc_val = CLIP_U8(i2_dc_val);
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ps_dec->pf_memset_8bit_8x8_block(pu1_vld_buf, i2_dc_val, u4_dst_wd);
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/* Common MB processing Steps */
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ps_dec->u2_num_mbs_left--;
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ps_dec->u2_mb_x++;
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if(ps_dec->s_bit_stream.u4_offset > ps_dec->s_bit_stream.u4_max_offset)
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{
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return IMPEG2D_BITSTREAM_BUFF_EXCEEDED_ERR;
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}
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else if (ps_dec->u2_mb_x == ps_dec->u2_num_horiz_mb)
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{
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ps_dec->u2_mb_x = 0;
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ps_dec->u2_mb_y++;
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}
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/* Flush end of macro block */
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impeg2d_bit_stream_flush(ps_stream,1);
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}
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while(ps_dec->u2_num_mbs_left != 0 && impeg2d_bit_stream_nxt(&ps_dec->s_bit_stream,23) != 0x0);
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return (IMPEG2D_ERROR_CODES_T)IVD_ERROR_NONE;
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}/* End of impeg2d_dec_d_slice() */
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