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