| /****************************************************************************** |
| * |
| * 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, |
| }; |
| |
