diff options
Diffstat (limited to 'libfreerdp/codec/rfx_quantization.c')
| -rw-r--r-- | libfreerdp/codec/rfx_quantization.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/libfreerdp/codec/rfx_quantization.c b/libfreerdp/codec/rfx_quantization.c new file mode 100644 index 0000000..fb871a2 --- /dev/null +++ b/libfreerdp/codec/rfx_quantization.c @@ -0,0 +1,104 @@ +/** + * 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); +} |