| Hamsalekha S | 8d3d303 | 2015-03-13 21:24:58 +0530 | [diff] [blame] | 1 | /****************************************************************************** |
| 2 | * |
| 3 | * Copyright (C) 2015 The Android Open Source Project |
| 4 | * |
| 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | * you may not use this file except in compliance with the License. |
| 7 | * You may obtain a copy of the License at: |
| 8 | * |
| 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | * |
| 11 | * Unless required by applicable law or agreed to in writing, software |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | * See the License for the specific language governing permissions and |
| 15 | * limitations under the License. |
| 16 | * |
| 17 | ***************************************************************************** |
| 18 | * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore |
| 19 | */ |
| 20 | /** |
| 21 | ******************************************************************************* |
| 22 | * @file |
| 23 | * ih264_trans_macros.h |
| 24 | * |
| 25 | * @brief |
| 26 | * The file contains definitions of macros that perform forward and inverse |
| 27 | * quantization |
| 28 | * |
| 29 | * @author |
| 30 | * Ittiam |
| 31 | * |
| 32 | * @remark |
| 33 | * None |
| 34 | * |
| 35 | ******************************************************************************* |
| 36 | */ |
| 37 | |
| 38 | #ifndef IH264_TRANS_MACROS_H_ |
| 39 | #define IH264_TRANS_MACROS_H_ |
| 40 | |
| 41 | /*****************************************************************************/ |
| 42 | /* Function Macros */ |
| 43 | /*****************************************************************************/ |
| 44 | |
| 45 | /** |
| 46 | ****************************************************************************** |
| 47 | * @brief Macro to perform forward quantization. |
| 48 | * @description The value to be quantized is first compared with a threshold. |
| 49 | * If the value is less than the threshold, the quantization value is returned |
| 50 | * as zero else the value is quantized traditionally as per the rules of |
| 51 | * h264 specification |
| 52 | ****************************************************************************** |
| 53 | */ |
| 54 | #define FWD_QUANT(i4_value, u4_abs_value, i4_sign, threshold, scale, rndfactor, qbits, u4_nnz) \ |
| 55 | {\ |
| 56 | if (i4_value < 0)\ |
| 57 | {\ |
| 58 | u4_abs_value = -i4_value;\ |
| 59 | i4_sign = -1;\ |
| 60 | }\ |
| 61 | else\ |
| 62 | {\ |
| 63 | u4_abs_value = i4_value;\ |
| 64 | i4_sign = 1;\ |
| 65 | }\ |
| 66 | if (u4_abs_value < threshold)\ |
| 67 | {\ |
| 68 | i4_value = 0;\ |
| 69 | }\ |
| 70 | else\ |
| 71 | {\ |
| 72 | u4_abs_value *= scale;\ |
| 73 | u4_abs_value += rndfactor;\ |
| 74 | u4_abs_value >>= qbits;\ |
| 75 | i4_value = u4_abs_value * i4_sign;\ |
| 76 | if (i4_value)\ |
| 77 | {\ |
| 78 | u4_nnz++;\ |
| 79 | }\ |
| 80 | }\ |
| 81 | } |
| 82 | |
| 83 | /** |
| 84 | ****************************************************************************** |
| 85 | * @brief Macro to perform inverse quantization. |
| 86 | * @remarks The value can also be de-quantized as |
| 87 | * if (u4_qp_div_6 < 4) |
| 88 | * { |
| 89 | * i4_value = (quant_scale * weight_scale * i4_value + (1 << (3-u4_qp_div_6))) |
| 90 | * i4_value >>= (4 - u4_qp_div_6) |
| 91 | * } |
| 92 | * else |
| 93 | * { |
| 94 | * i4_value = (quant_scale * weight_scale * i4_value) << (u4_qp_div_6 -4) |
| 95 | * } |
| 96 | ****************************************************************************** |
| 97 | */ |
| 98 | #define INV_QUANT(i4_value, quant_scale, weight_scale, u4_qp_div_6, rndfactor, qbits)\ |
| 99 | {\ |
| 100 | i4_value *= quant_scale;\ |
| 101 | i4_value *= weight_scale;\ |
| 102 | i4_value += rndfactor;\ |
| 103 | i4_value <<= u4_qp_div_6;\ |
| 104 | i4_value >>= qbits;\ |
| 105 | } |
| 106 | |
| 107 | #define QUANT_H264(x,y,w,z,shft) (shft = ABS(x),\ |
| 108 | shft *= y,\ |
| 109 | shft += z,\ |
| 110 | shft = shft>>w,\ |
| 111 | shft = SIGNXY(shft,x)) |
| 112 | |
| 113 | #define IQUANT_H264(x,y,wscal,w,shft) (shft = x, \ |
| 114 | shft *=y, \ |
| 115 | shft *=wscal, \ |
| 116 | shft = shft<<w) |
| 117 | |
| 118 | #define IQUANT_lev_H264(x,y,wscal,add_f,w,shft) (shft = x, \ |
| 119 | shft *=y, \ |
| 120 | shft *=wscal, \ |
| 121 | shft+= add_f, \ |
| 122 | shft = shft>>w) |
| 123 | |
| 124 | #endif /* IH264_TRANS_MACROS_H_ */ |