103 lines
3.7 KiB
C
103 lines
3.7 KiB
C
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/**
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* FreeRDP: A Remote Desktop Protocol Implementation
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* RemoteFX Codec Library - Quantization
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*
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* Copyright 2011 Vic Lee
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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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <freerdp/primitives.h>
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#include "rfx_quantization.h"
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/*
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* Band Offset Dimensions Size
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*
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* HL1 0 32x32 1024
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* LH1 1024 32x32 1024
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* HH1 2048 32x32 1024
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*
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* HL2 3072 16x16 256
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* LH2 3328 16x16 256
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* HH2 3584 16x16 256
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*
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* HL3 3840 8x8 64
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* LH3 3904 8x8 64
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* HH3 3968 8x8 64
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*
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* LL3 4032 8x8 64
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*/
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static void rfx_quantization_decode_block(const primitives_t* prims, INT16* buffer, int buffer_size,
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UINT32 factor)
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{
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if (factor == 0)
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return;
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prims->lShiftC_16s(buffer, factor, buffer, buffer_size);
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}
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void rfx_quantization_decode(INT16* buffer, const UINT32* quantVals)
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{
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const primitives_t* prims = primitives_get();
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rfx_quantization_decode_block(prims, &buffer[0], 1024, quantVals[8] - 1); /* HL1 */
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rfx_quantization_decode_block(prims, &buffer[1024], 1024, quantVals[7] - 1); /* LH1 */
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rfx_quantization_decode_block(prims, &buffer[2048], 1024, quantVals[9] - 1); /* HH1 */
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rfx_quantization_decode_block(prims, &buffer[3072], 256, quantVals[5] - 1); /* HL2 */
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rfx_quantization_decode_block(prims, &buffer[3328], 256, quantVals[4] - 1); /* LH2 */
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rfx_quantization_decode_block(prims, &buffer[3584], 256, quantVals[6] - 1); /* HH2 */
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rfx_quantization_decode_block(prims, &buffer[3840], 64, quantVals[2] - 1); /* HL3 */
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rfx_quantization_decode_block(prims, &buffer[3904], 64, quantVals[1] - 1); /* LH3 */
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rfx_quantization_decode_block(prims, &buffer[3968], 64, quantVals[3] - 1); /* HH3 */
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rfx_quantization_decode_block(prims, &buffer[4032], 64, quantVals[0] - 1); /* LL3 */
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}
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static void rfx_quantization_encode_block(INT16* buffer, int buffer_size, UINT32 factor)
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{
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INT16* dst;
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INT16 half;
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if (factor == 0)
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return;
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half = (1 << (factor - 1));
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/* Could probably use prims->rShiftC_16s(dst+half, factor, dst, buffer_size); */
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for (dst = buffer; buffer_size > 0; dst++, buffer_size--)
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{
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*dst = (*dst + half) >> factor;
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}
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}
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void rfx_quantization_encode(INT16* buffer, const UINT32* quantization_values)
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{
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rfx_quantization_encode_block(buffer, 1024, quantization_values[8] - 6); /* HL1 */
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rfx_quantization_encode_block(buffer + 1024, 1024, quantization_values[7] - 6); /* LH1 */
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rfx_quantization_encode_block(buffer + 2048, 1024, quantization_values[9] - 6); /* HH1 */
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rfx_quantization_encode_block(buffer + 3072, 256, quantization_values[5] - 6); /* HL2 */
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rfx_quantization_encode_block(buffer + 3328, 256, quantization_values[4] - 6); /* LH2 */
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rfx_quantization_encode_block(buffer + 3584, 256, quantization_values[6] - 6); /* HH2 */
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rfx_quantization_encode_block(buffer + 3840, 64, quantization_values[2] - 6); /* HL3 */
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rfx_quantization_encode_block(buffer + 3904, 64, quantization_values[1] - 6); /* LH3 */
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rfx_quantization_encode_block(buffer + 3968, 64, quantization_values[3] - 6); /* HH3 */
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rfx_quantization_encode_block(buffer + 4032, 64, quantization_values[0] - 6); /* LL3 */
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/* The coefficients are scaled by << 5 at RGB->YCbCr phase, so we round it back here */
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rfx_quantization_encode_block(buffer, 4096, 5);
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}
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