83 lines
3.4 KiB
C
83 lines
3.4 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol client.
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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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#include "rfx_quantization.h"
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static void rfx_quantization_decode_block(sint16* buffer, int buffer_size, uint32 factor)
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{
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sint16* dst;
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if (factor == 0)
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return;
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for (dst = buffer; buffer_size > 0; dst++, buffer_size--)
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{
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*dst <<= factor;
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}
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}
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void rfx_quantization_decode(sint16* buffer, const uint32* quantization_values)
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{
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/* Scale the values so that they are represented as 11.5 fixed-point number */
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rfx_quantization_decode_block(buffer, 4096, 5);
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rfx_quantization_decode_block(buffer, 1024, quantization_values[8] - 6); /* HL1 */
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rfx_quantization_decode_block(buffer + 1024, 1024, quantization_values[7] - 6); /* LH1 */
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rfx_quantization_decode_block(buffer + 2048, 1024, quantization_values[9] - 6); /* HH1 */
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rfx_quantization_decode_block(buffer + 3072, 256, quantization_values[5] - 6); /* HL2 */
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rfx_quantization_decode_block(buffer + 3328, 256, quantization_values[4] - 6); /* LH2 */
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rfx_quantization_decode_block(buffer + 3584, 256, quantization_values[6] - 6); /* HH2 */
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rfx_quantization_decode_block(buffer + 3840, 64, quantization_values[2] - 6); /* HL3 */
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rfx_quantization_decode_block(buffer + 3904, 64, quantization_values[1] - 6); /* LH3 */
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rfx_quantization_decode_block(buffer + 3968, 64, quantization_values[3] - 6); /* HH3 */
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rfx_quantization_decode_block(buffer + 4032, 64, quantization_values[0] - 6); /* LL3 */
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}
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static void rfx_quantization_encode_block(sint16* buffer, int buffer_size, uint32 factor)
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{
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sint16* dst;
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sint16 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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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(sint16* 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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