| /****************************************************************************** |
| * |
| * 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_mem_func.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)) |
| { |
| ps_dec->pf_memset_16bit_8x8_linear_block (pi2_out_addr); |
| } |
| |
| 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 u4_sum_is_even; |
| 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)) |
| { |
| ps_dec->pf_memset_16bit_8x8_linear_block (pi2_out_addr); |
| } |
| |
| u4_sum_is_even = 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] ^= (u4_sum_is_even & 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; |
| UWORD32 u4_level_first_byte; |
| WORD32 u4_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); |
| u4_level = DecodedValue >> 9; |
| /* One table lookup */ |
| if(0 != u4_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] = u4_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); |
| u4_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] = u4_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); |
| u4_level = (u4_decoded_value & 0x0FFF); |
| |
| if (u4_level) |
| u4_level = (u4_level - ((u4_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] = u4_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); |
| u4_level_first_byte = (u4_decoded_value & 0x0FF); |
| if(u4_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 |
| *-------------------------------------------------------*/ |
| u4_level = (u4_level_first_byte - |
| ((u4_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) |
| u4_level = u4_bits; |
| u4_level = (u4_level - (u4_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] = u4_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); |
| u4_level = ((WORD16) DecodedValue) >> 9; |
| |
| if (0 != u4_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] = u4_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); |
| u4_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] = u4_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); |
| u4_level = (u4_decoded_value & 0x0FFF); |
| |
| if (u4_level) |
| u4_level = (u4_level - ((u4_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] = u4_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); |
| u4_level_first_byte = (u4_decoded_value & 0x0FF); |
| if(u4_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 |
| *-------------------------------------------------------*/ |
| u4_level = (u4_level_first_byte - |
| ((u4_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) |
| u4_level = u4_bits; |
| u4_level = (u4_level - (u4_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] = u4_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 : */ |
| /* blk, - Block to be inverse quantized */ |
| /* weighting_matrix - Matrix to be used in inverse quant */ |
| /* intra_dc_precision- Precision reqd to scale intra DC value */ |
| /* quant_scale - Quanization scale for inverse quant */ |
| /* intra_flag - Intra or Not */ |
| /* */ |
| /* Globals : None */ |
| /* */ |
| /* Processing : Implements the inverse quantize equation */ |
| /* */ |
| /* Outputs : Inverse quantized values in the block */ |
| /* */ |
| /* Returns : None */ |
| /* */ |
| /* Issues : None */ |
| /* */ |
| /* Revision History: */ |
| /* */ |
| /* DD MM YYYY Author(s) Changes */ |
| /* 05 09 2005 Harish M First Version */ |
| /* */ |
| /*****************************************************************************/ |
| UWORD8 impeg2d_inv_quant_mpeg1(WORD16 *pi2_blk, |
| UWORD8 *pu1_weighting_matrix, |
| UWORD8 u1_quant_scale, |
| WORD32 u4_intra_flag, |
| WORD32 i4_num_coeffs, |
| WORD16 *pi2_coeffs, |
| UWORD8 *pu1_pos, |
| const UWORD8 *pu1_scan, |
| UWORD16 *pu2_def_dc_pred, |
| UWORD16 u2_intra_dc_precision) |
| { |
| UWORD16 i4_pos; |
| |
| WORD32 i4_iter; |
| |
| /* Inverse Quantize the predicted DC value for intra MB*/ |
| if(u4_intra_flag == 1) |
| { |
| /**************************************************************************/ |
| /* Decode the DC coefficient in case of Intra block and also update */ |
| /* DC predictor value of the corresponding color component */ |
| /**************************************************************************/ |
| { |
| pi2_coeffs[0] += *pu2_def_dc_pred; |
| *pu2_def_dc_pred = pi2_coeffs[0]; |
| pi2_coeffs[0] <<= (3 - u2_intra_dc_precision); |
| pi2_coeffs[0] = CLIP_S12(pi2_coeffs[0]); |
| } |
| |
| pi2_blk[pu1_scan[0]] = pi2_coeffs[0]; |
| } |
| /************************************************************************/ |
| /* Inverse quantization of other DCT coefficients */ |
| /************************************************************************/ |
| for(i4_iter = u4_intra_flag; i4_iter < i4_num_coeffs; i4_iter++) |
| { |
| |
| WORD16 sign; |
| WORD32 temp, temp1; |
| |
| /* Position is the inverse scan of the index stored */ |
| i4_pos = pu1_pos[i4_iter]; |
| pi2_blk[i4_pos] = pi2_coeffs[i4_iter]; |
| |
| sign = SIGN(pi2_blk[i4_pos]); |
| temp = ABS(pi2_blk[i4_pos] << 1); |
| |
| /* pi2_coeffs has only non-zero elements. So no need to check |
| * if the coeff is non-zero. |
| */ |
| temp = temp + (1 * !u4_intra_flag); |
| |
| temp = temp * pu1_weighting_matrix[i4_pos] * u1_quant_scale; |
| |
| temp = temp >> 5; |
| |
| temp1 = temp | 1; |
| |
| temp1 = (temp1 > temp) ? (temp1 - temp) : (temp - temp1); |
| |
| temp = temp - temp1; |
| |
| if(temp < 0) |
| { |
| temp = 0; |
| } |
| |
| temp = temp * sign; |
| |
| temp = CLIP_S12(temp); |
| |
| pi2_blk[i4_pos] = temp; |
| } |
| |
| /*return value is used in the case of mpeg2 for mismatch control*/ |
| return (0); |
| } /* End of inv_quant() */ |
| |
| |
| |
| /*****************************************************************************/ |
| /* */ |
| /* Function Name : impeg2d_inv_quant_mpeg2 */ |
| /* */ |
| /* Description : Inverse quantizes the output of VLD */ |
| /* */ |
| /* Inputs : */ |
| /* blk, - Block to be inverse quantized */ |
| /* weighting_matrix - Matrix to be used in inverse quant */ |
| /* intra_dc_precision- Precision reqd to scale intra DC value */ |
| /* quant_scale - Quanization scale for inverse quant */ |
| /* intra_flag - Intra or Not */ |
| /* */ |
| /* Globals : None */ |
| /* */ |
| /* Processing : Implements the inverse quantize equation */ |
| /* */ |
| /* Outputs : Inverse quantized values in the block */ |
| /* */ |
| /* Returns : None */ |
| /* */ |
| /* Issues : None */ |
| /* */ |
| /* Revision History: */ |
| /* */ |
| /* DD MM YYYY Author(s) Changes */ |
| /* 05 09 2005 Harish M First Version */ |
| /* */ |
| /*****************************************************************************/ |
| UWORD8 impeg2d_inv_quant_mpeg2(WORD16 *pi2_blk, |
| UWORD8 *pu1_weighting_matrix, |
| UWORD8 u1_quant_scale, |
| WORD32 u4_intra_flag, |
| WORD32 i4_num_coeffs, |
| WORD16 *pi2_coeffs, |
| UWORD8 *pu1_pos, |
| const UWORD8 *pu1_scan, |
| UWORD16 *pu2_def_dc_pred, |
| UWORD16 u2_intra_dc_precision) |
| { |
| |
| WORD32 i4_pos; |
| /* Used for Mismatch control */ |
| UWORD32 sum; |
| |
| WORD32 i4_iter; |
| |
| sum = 0; |
| |
| /* Inverse Quantize the predicted DC value for intra MB*/ |
| if(u4_intra_flag == 1) |
| { |
| /**************************************************************************/ |
| /* Decode the DC coefficient in case of Intra block and also update */ |
| /* DC predictor value of the corresponding color component */ |
| /**************************************************************************/ |
| { |
| pi2_coeffs[0] += *pu2_def_dc_pred; |
| *pu2_def_dc_pred = pi2_coeffs[0]; |
| pi2_coeffs[0] <<= (3 - u2_intra_dc_precision); |
| pi2_coeffs[0] = CLIP_S12(pi2_coeffs[0]); |
| } |
| |
| pi2_blk[pu1_scan[0]] = pi2_coeffs[0]; |
| sum = pi2_blk[0]; |
| } |
| |
| /************************************************************************/ |
| /* Inverse quantization of other DCT coefficients */ |
| /************************************************************************/ |
| for(i4_iter = u4_intra_flag; i4_iter < i4_num_coeffs; i4_iter++) |
| { |
| WORD16 sign; |
| WORD32 temp; |
| /* Position is the inverse scan of the index stored */ |
| i4_pos = pu1_pos[i4_iter]; |
| pi2_blk[i4_pos] = pi2_coeffs[i4_iter]; |
| |
| sign = SIGN(pi2_blk[i4_pos]); |
| temp = ABS(pi2_blk[i4_pos] << 1); |
| temp = temp + (1 * !u4_intra_flag); |
| temp = temp * pu1_weighting_matrix[i4_pos] * u1_quant_scale; |
| |
| temp = temp >> 5; |
| |
| temp = temp * sign; |
| |
| temp = CLIP_S12(temp); |
| |
| pi2_blk[i4_pos] = temp; |
| |
| sum += temp; |
| } |
| return (sum ^ 1); |
| } /* End of inv_quant() */ |
