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124 lines
4.4 KiB
124 lines
4.4 KiB
/****************************************************************************** |
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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_macros.h |
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* |
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* @brief |
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* The file contains definitions of macros that perform forward and inverse |
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* quantization |
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* |
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* @author |
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* Ittiam |
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* |
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* @remark |
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* None |
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* |
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******************************************************************************* |
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*/ |
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#ifndef IH264_TRANS_MACROS_H_ |
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#define IH264_TRANS_MACROS_H_ |
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/*****************************************************************************/ |
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/* Function Macros */ |
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/*****************************************************************************/ |
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/** |
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****************************************************************************** |
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* @brief Macro to perform forward quantization. |
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* @description The value to be quantized is first compared with a threshold. |
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* If the value is less than the threshold, the quantization value is returned |
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* as zero else the value is quantized traditionally as per the rules of |
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* h264 specification |
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****************************************************************************** |
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*/ |
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#define FWD_QUANT(i4_value, u4_abs_value, i4_sign, threshold, scale, rndfactor, qbits, u4_nnz) \ |
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{\ |
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if (i4_value < 0)\ |
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{\ |
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u4_abs_value = -i4_value;\ |
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i4_sign = -1;\ |
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}\ |
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else\ |
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{\ |
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u4_abs_value = i4_value;\ |
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i4_sign = 1;\ |
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}\ |
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if (u4_abs_value < threshold)\ |
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{\ |
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i4_value = 0;\ |
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}\ |
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else\ |
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{\ |
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u4_abs_value *= scale;\ |
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u4_abs_value += rndfactor;\ |
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u4_abs_value >>= qbits;\ |
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i4_value = u4_abs_value * i4_sign;\ |
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if (i4_value)\ |
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{\ |
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u4_nnz++;\ |
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}\ |
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}\ |
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} |
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/** |
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****************************************************************************** |
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* @brief Macro to perform inverse quantization. |
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* @remarks The value can also be de-quantized as |
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* if (u4_qp_div_6 < 4) |
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* { |
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* i4_value = (quant_scale * weight_scale * i4_value + (1 << (3-u4_qp_div_6))) |
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* i4_value >>= (4 - u4_qp_div_6) |
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* } |
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* else |
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* { |
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* i4_value = (quant_scale * weight_scale * i4_value) << (u4_qp_div_6 -4) |
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* } |
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****************************************************************************** |
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*/ |
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#define INV_QUANT(i4_value, quant_scale, weight_scale, u4_qp_div_6, rndfactor, qbits)\ |
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{\ |
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i4_value *= quant_scale;\ |
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i4_value *= weight_scale;\ |
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i4_value += rndfactor;\ |
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i4_value <<= u4_qp_div_6;\ |
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i4_value >>= qbits;\ |
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} |
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#define QUANT_H264(x,y,w,z,shft) (shft = ABS(x),\ |
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shft *= y,\ |
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shft += z,\ |
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shft = shft>>w,\ |
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shft = SIGNXY(shft,x)) |
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#define IQUANT_H264(x,y,wscal,w,shft) (shft = x, \ |
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shft *=y, \ |
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shft *=wscal, \ |
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shft = shft<<w) |
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#define IQUANT_lev_H264(x,y,wscal,add_f,w,shft) (shft = x, \ |
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shft *=y, \ |
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shft *=wscal, \ |
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shft+= add_f, \ |
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shft = shft>>w) |
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#endif /* IH264_TRANS_MACROS_H_ */
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