1 /**
2 * FreeRDP: A Remote Desktop Protocol Implementation
3 * RemoteFX Codec Library - Quantization
4 *
5 * Copyright 2011 Vic Lee
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 */
19
20 #ifdef HAVE_CONFIG_H
21 #include "config.h"
22 #endif
23
24 #include <freerdp/primitives.h>
25
26 #include "rfx_quantization.h"
27
28 /*
29 * Band Offset Dimensions Size
30 *
31 * HL1 0 32x32 1024
32 * LH1 1024 32x32 1024
33 * HH1 2048 32x32 1024
34 *
35 * HL2 3072 16x16 256
36 * LH2 3328 16x16 256
37 * HH2 3584 16x16 256
38 *
39 * HL3 3840 8x8 64
40 * LH3 3904 8x8 64
41 * HH3 3968 8x8 64
42 *
43 * LL3 4032 8x8 64
44 */
45
rfx_quantization_decode_block(const primitives_t * prims,INT16 * buffer,int buffer_size,UINT32 factor)46 static void rfx_quantization_decode_block(const primitives_t* prims, INT16* buffer, int buffer_size,
47 UINT32 factor)
48 {
49 if (factor == 0)
50 return;
51
52 prims->lShiftC_16s(buffer, factor, buffer, buffer_size);
53 }
54
rfx_quantization_decode(INT16 * buffer,const UINT32 * quantVals)55 void rfx_quantization_decode(INT16* buffer, const UINT32* quantVals)
56 {
57 const primitives_t* prims = primitives_get();
58
59 rfx_quantization_decode_block(prims, &buffer[0], 1024, quantVals[8] - 1); /* HL1 */
60 rfx_quantization_decode_block(prims, &buffer[1024], 1024, quantVals[7] - 1); /* LH1 */
61 rfx_quantization_decode_block(prims, &buffer[2048], 1024, quantVals[9] - 1); /* HH1 */
62 rfx_quantization_decode_block(prims, &buffer[3072], 256, quantVals[5] - 1); /* HL2 */
63 rfx_quantization_decode_block(prims, &buffer[3328], 256, quantVals[4] - 1); /* LH2 */
64 rfx_quantization_decode_block(prims, &buffer[3584], 256, quantVals[6] - 1); /* HH2 */
65 rfx_quantization_decode_block(prims, &buffer[3840], 64, quantVals[2] - 1); /* HL3 */
66 rfx_quantization_decode_block(prims, &buffer[3904], 64, quantVals[1] - 1); /* LH3 */
67 rfx_quantization_decode_block(prims, &buffer[3968], 64, quantVals[3] - 1); /* HH3 */
68 rfx_quantization_decode_block(prims, &buffer[4032], 64, quantVals[0] - 1); /* LL3 */
69 }
70
rfx_quantization_encode_block(INT16 * buffer,int buffer_size,UINT32 factor)71 static void rfx_quantization_encode_block(INT16* buffer, int buffer_size, UINT32 factor)
72 {
73 INT16* dst;
74 INT16 half;
75
76 if (factor == 0)
77 return;
78
79 half = (1 << (factor - 1));
80 /* Could probably use prims->rShiftC_16s(dst+half, factor, dst, buffer_size); */
81 for (dst = buffer; buffer_size > 0; dst++, buffer_size--)
82 {
83 *dst = (*dst + half) >> factor;
84 }
85 }
86
rfx_quantization_encode(INT16 * buffer,const UINT32 * quantization_values)87 void rfx_quantization_encode(INT16* buffer, const UINT32* quantization_values)
88 {
89 rfx_quantization_encode_block(buffer, 1024, quantization_values[8] - 6); /* HL1 */
90 rfx_quantization_encode_block(buffer + 1024, 1024, quantization_values[7] - 6); /* LH1 */
91 rfx_quantization_encode_block(buffer + 2048, 1024, quantization_values[9] - 6); /* HH1 */
92 rfx_quantization_encode_block(buffer + 3072, 256, quantization_values[5] - 6); /* HL2 */
93 rfx_quantization_encode_block(buffer + 3328, 256, quantization_values[4] - 6); /* LH2 */
94 rfx_quantization_encode_block(buffer + 3584, 256, quantization_values[6] - 6); /* HH2 */
95 rfx_quantization_encode_block(buffer + 3840, 64, quantization_values[2] - 6); /* HL3 */
96 rfx_quantization_encode_block(buffer + 3904, 64, quantization_values[1] - 6); /* LH3 */
97 rfx_quantization_encode_block(buffer + 3968, 64, quantization_values[3] - 6); /* HH3 */
98 rfx_quantization_encode_block(buffer + 4032, 64, quantization_values[0] - 6); /* LL3 */
99
100 /* The coefficients are scaled by << 5 at RGB->YCbCr phase, so we round it back here */
101 rfx_quantization_encode_block(buffer, 4096, 5);
102 }
103