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/******************************************************************************
*
* 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
*/
/**
*******************************************************************************
* @file
* ih264e_globals.c
*
* @brief
* Contains definitions of global variables used across the encoder
*
* @author
* ittiam
*
* @remarks
*
*******************************************************************************
*/
/*****************************************************************************/
/* File Includes */
/*****************************************************************************/
/* User Include Files */
#include "ih264_typedefs.h"
#include "ih264_defs.h"
#include "ih264e_defs.h"
#include "ih264e_globals.h"
/*****************************************************************************/
/* Global definitions */
/*****************************************************************************/
/**
******************************************************************************
* @brief lambda for varying quantizer scales that would be used to
* compute the RD cost while deciding on the MB modes.
* input : qp
* output : lambda
* @remarks lambda = 0.85 * pow(2, (qp - 12)/3), when SSD is used as metric
* for computing distortion (Bit rate estimation for cost function of H.264/
* AVC by Mohd Golam Sarwer et. al.) If the use of distortion metric is SAD
* rather than SSD in the stage of encoding, consider sqrt(lambda) simply to
* adjust lambda for the lack of squaring operation in the error computation
* (from rate distortion optimization for video compression by sullivan).
******************************************************************************
*/
const UWORD8 gu1_qp_lambdaIP[52]=
{
0, 0, 0, 0, 0, 0, 0, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 2, 2, 2, 2, 3, 3, 3,
4, 4, 5, 5, 6, 7, 7, 8,
9, 10, 12, 13, 15, 17, 19, 21,
23, 26, 30, 33, 37, 42, 47, 53,
59, 66, 74, 83,
};
/**
******************************************************************************
* @brief lambda for varying quantizer scales that would be used to
* compute the RD cost while deciding on the MB modes.
* input : qp
* output : lambda
* @remarks lambda = max(2, min(4, pow(2, (qp - 12)/6))) * gu1_qp_lambdaIP[]
******************************************************************************
*/
const UWORD8 gu1_qp_lambdaB[52]=
{
0, 0, 0, 0, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 2, 2,
2, 2, 3, 3, 3, 4, 4, 5,
5, 6, 7, 8, 10, 11, 13, 15,
17, 20, 22, 26, 30, 33, 37, 42,
47, 53, 59, 66, 74, 83, 94, 105,
118, 132, 149, 167,
};
/**
******************************************************************************
* @brief Lamda for varying quantizer scales that would be used to
* compute the RD cost while deciding on the MB modes.
* input : qp
* output : lambda
* @remarks lambda = pow(2, (qp - 12)/6)
******************************************************************************
*/
const UWORD8 gu1_qp0[52]=
{
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 1, 1, 1, 1,
2, 2, 2, 2, 3, 3, 3, 4,
4, 4, 5, 6, 6, 7, 8, 9,
10, 11, 13, 14, 16, 18, 20, 23,
25, 29, 32, 36, 40, 45, 51, 57,
64, 72, 81, 91,
};
/**
******************************************************************************
* @brief unsigned exp. goulumb codelengths to assign cost to a coefficient of
* mb types.
* input : Integer
* output : codelength
* @remarks Refer sec. 9-1 in h264 specification
******************************************************************************
*/
const UWORD8 u1_uev_codelength[32] =
{
1, 3, 3, 5, 5, 5, 5, 7,
7, 7, 7, 7, 7, 7, 7, 9,
9, 9, 9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 9, 9, 9, 11,
};
/**
******************************************************************************
* @brief Look up table to assign cost to a coefficient of a residual block
* basing on its surrounding coefficients
* input : Numbers of T1's
* output : coeff_cost
* @remarks Refer Section 2.3 Elimination of single coefficients in inter
* macroblocks in document JVT-O079
******************************************************************************
*/
const UWORD8 gu1_coeff_cost[6] =
{
3, 2, 2, 1, 1, 1
};
/**
******************************************************************************
* @brief Indices map to raster scan for luma 4x4 block
* input : scan index
* output : scan location
* @remarks None
******************************************************************************
*/
const UWORD8 gu1_luma_scan_order[16] =
{
0, 1, 4, 8, 5, 2, 3, 6, 9, 12, 13, 10, 7, 11, 14, 15
};
/**
******************************************************************************
* @brief Indices map to raster scan for chroma AC block
* input : scan index
* output : scan location
* @remarks None
******************************************************************************
*/
const UWORD8 gu1_chroma_scan_order[15] =
{
1, 4, 8, 5, 2, 3, 6, 9, 12, 13, 10, 7, 11, 14, 15
};
/**
******************************************************************************
* @brief Indices map to raster scan for luma 4x4 dc block
* input : scan index
* output : scan location
* @remarks : None
******************************************************************************
*/
const UWORD8 gu1_luma_scan_order_dc[16] =
{
0, 1, 4, 8, 5, 2, 3, 6, 9, 12, 13, 10, 7, 11, 14, 15
};
/**
******************************************************************************
* @brief Indices map to raster scan for chroma 2x2 dc block
* input : scan index
* output : scan location
* @remarks None
******************************************************************************
*/
const UWORD8 gu1_chroma_scan_order_dc[4] =
{
0, 1, 2, 3
};
/**
******************************************************************************
* @brief choice of motion vectors to be used during mv prediction
* input : formatted reference idx comparison metric
* output : mv prediction has to be median or a simple straight forward selec
* tion from neighbors.
* @remarks If only one of the candidate blocks has a reference frame equal to
the current block then use the same block as the final predictor. A simple
look up table to assist this mv prediction condition
******************************************************************************
*/
const WORD8 gi1_mv_pred_condition[8] =
{
-1, 0, 1, -1, 2, -1, -1, -1
};
/**
******************************************************************************
* @brief Translation of Qstep <-> QP
* Qstep(QP) = Qstep(QP%6) * (2 ^ floor(QP/6))
* Qstep(QP, n = 0) {0.625, 0.6875, 0.8125, 0.875, 1.0, 1.125} for QP[0-5]
* @remarks QPRange[0-51] & QstepRange[1 - 224].
******************************************************************************
*/
const UWORD8 gau1_h264_to_mpeg2_qmap[H264_QP_ELEM] =
{
1, 1, 1, 1, 1, 1, 1, 1,
2, 2, 2, 2, 3, 3, 3, 4,
4, 5, 5, 6, 7, 7, 8, 9,
10, 11, 13, 14, 16, 18, 20, 22,
26, 28, 32, 36, 40, 44, 52, 56,
64, 72, 80, 88, 104, 112, 128, 144,
160, 176, 208, 224,
};
const UWORD8 gau1_mpeg2_to_h264_qmap[MPEG2_QP_ELEM] =
{
0, 4, 10, 13, 16, 18, 19, 21,
22, 23, 24, 25, 25, 26, 27, 27,
28, 28, 29, 30, 30, 30, 31, 31,
31, 32, 32, 32, 33, 33, 33, 34,
34, 34, 34, 35, 35, 36, 36, 36,
36, 36, 36, 37, 37, 37, 37, 37,
37, 38, 38, 38, 38, 38, 38, 39,
39, 39, 39, 39, 39, 40, 40, 40,
40, 40, 40, 40, 40, 41, 41, 41,
41, 42, 42, 42, 42, 42, 42, 42,
42, 42, 42, 42, 42, 43, 43, 43,
43, 43, 43, 43, 43, 43, 43, 43,
43, 44, 44, 44, 44, 44, 44, 44,
44, 44, 44, 44, 44, 45, 45, 45,
45, 45, 45, 45, 45, 45, 45, 45,
45, 46, 46, 46, 46, 46, 46, 46,
46, 46, 46, 46, 46, 46, 46, 46,
46, 47, 47, 47, 47, 47, 47, 47,
47, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 49, 49, 49, 49, 49, 49, 49,
49, 49, 49, 49, 49, 49, 49, 49,
49, 49, 49, 49, 49, 49, 49, 49,
49, 50, 50, 50, 50, 50, 50, 50,
50, 50, 50, 50, 50, 50, 50, 50,
50, 50, 50, 50, 50, 50, 50, 50,
50, 51, 51, 51, 51, 51, 51, 51,
51, 51, 51, 51, 51, 51, 51, 51,
51, 51, 51, 51, 51, 51, 51, 51,
51, 52, 52, 52, 52, 52, 52, 52,
52, 52, 52, 52, 52, 52, 52, 52,
};
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