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126 lines
4.9 KiB
C
126 lines
4.9 KiB
C
/******************************************************************************
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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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/**
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*******************************************************************************
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* @file
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* ih264_trans_data.h
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*
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* @brief
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* Contains declaration of global variables for H264 transform , qnat and inverse quant
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*
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* @author
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* Ittiam
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*
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* @remarks
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*
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*******************************************************************************
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*/
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#ifndef IH264_GLOBAL_DATA_H_
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#define IH264_GLOBAL_DATA_H_
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/*****************************************************************************/
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/* Extern global declarations */
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/*****************************************************************************/
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/* Scaling matrices for h264 quantization */
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extern const UWORD16 g_scal_coff_h264_4x4[16];
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extern const UWORD16 g_scal_coff_h264_8x8[16];
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/**
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******************************************************************************
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* @brief Scale Table for quantizing 4x4 subblock. To quantize a given 4x4 DCT
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* transformed block, the coefficient at index location (i,j) is scaled by one of
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* the constants in this table and right shift the result by (QP_BITS_h264_4x4 +
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* floor(qp/6)), here qp is the quantization parameter used to quantize the mb.
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*
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* input : qp%6, index location (i,j)
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* output : scale constant.
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*
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* @remarks 16 constants for each index position of the subblock and 6 for each
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* qp%6 in the range 0-5 inclusive.
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******************************************************************************
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*/
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extern const UWORD16 gu2_quant_scale_matrix_4x4[96];
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/**
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******************************************************************************
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* @brief Round Factor for quantizing subblock. While quantizing a given 4x4 DCT
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* transformed block, the coefficient at index location (i,j) is scaled by one of
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* the constants in the table gu2_forward_quant_scalar_4x4 and then right shift
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* the result by (QP_BITS_h264_4x4 + floor(qp/6)).
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* Before right shifting a round factor is added.
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* The round factor can be any value [a * (1 << (QP_BITS_h264_4x4 + floor(qp/6)))]
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* for 'a' lies in the range 0-0.5.
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* Here qp is the quantization parameter used to quantize the mb.
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*
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* input : qp/6
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* output : round factor.
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*
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* @remarks The round factor is constructed by setting a = 1/3
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******************************************************************************
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*/
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extern const UWORD32 gu4_forward_quant_round_factor_4x4[9];
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/**
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******************************************************************************
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* @brief Threshold Table. Quantizing the given DCT coefficient is done only if
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* it exceeds the threshold value presented in this table.
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*
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* input : qp/6, qp%6, index location (i,j)
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* output : Threshold constant.
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*
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* @remarks 16 constants for each index position of the subblock and 6 for each
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* qp%6 in the range 0-5 inclusive and 9 for each qp/6 in the range 0-51.
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******************************************************************************
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*/
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extern const UWORD16 gu2_forward_quant_threshold_4x4[96];
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/**
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******************************************************************************
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* @brief Scale Table for quantizing 8x8 subblock. To quantize a given 8x8 DCT
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* transformed block, the coefficient at index location (i,j) is scaled by one of
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* the constants in this table and right shift the result by (QP_BITS_h264_8x8 +
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* floor(qp/6)), here qp is the quantization parameter used to quantize the mb.
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*
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* input : qp%6, index location (i,j)
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* output : scale constant.
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*
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* @remarks 64 constants for each index position of the subblock and 6 for each
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* qp%6 in the range 0-5 inclusive.
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******************************************************************************
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*/
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extern const UWORD16 gu2_quant_scale_matrix_8x8 [384];
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/**
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******************************************************************************
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* @brief Specification of QPc as a function of qPi
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*
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* input : qp luma
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* output : qp chroma.
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*
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* @remarks Refer Table 8-15 of h264 specification.
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******************************************************************************
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*/
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extern const UWORD8 gu1_qpc_fqpi[52];
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#endif /* IH264_GLOBAL_DATA_H_ */
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