← Back to branch summary

~paulliu/ubuntu/quantal/freerdp/fixext

« back to all changes in this revision

Viewing changes to libfreerdp-codec/rfx_quantization.c

  • Committer: Package Import Robot
  • Author(s): Martin Pitt
  • Date: 2012-01-31 10:02:14 UTC
  • mto: This revision was merged to the branch mainline in revision 11.
  • Revision ID: package-import@ubuntu.com-20120131100214-zvig71djj2sqgq22
Tags: upstream-1.0.0
Import upstream version 1.0.0

Show diffs side-by-side

added added

removed removed

Lines of Context:
libfreerdp-codec/rfx_quantization.c
 
1
/**
 
2
 * FreeRDP: A Remote Desktop Protocol client.
 
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
#include "rfx_quantization.h"
 
21
 
 
22
static void rfx_quantization_decode_block(sint16* buffer, int buffer_size, uint32 factor)
 
23
{
 
24
        sint16* dst;
 
25
 
 
26
        if (factor == 0)
 
27
                return;
 
28
 
 
29
        for (dst = buffer; buffer_size > 0; dst++, buffer_size--)
 
30
        {
 
31
                *dst <<= factor;
 
32
        }
 
33
}
 
34
 
 
35
void rfx_quantization_decode(sint16* buffer, const uint32* quantization_values)
 
36
{
 
37
        /* Scale the values so that they are represented as 11.5 fixed-point number */
 
38
        rfx_quantization_decode_block(buffer, 4096, 5);
 
39
 
 
40
        rfx_quantization_decode_block(buffer, 1024, quantization_values[8] - 6); /* HL1 */
 
41
        rfx_quantization_decode_block(buffer + 1024, 1024, quantization_values[7] - 6); /* LH1 */
 
42
        rfx_quantization_decode_block(buffer + 2048, 1024, quantization_values[9] - 6); /* HH1 */
 
43
        rfx_quantization_decode_block(buffer + 3072, 256, quantization_values[5] - 6); /* HL2 */
 
44
        rfx_quantization_decode_block(buffer + 3328, 256, quantization_values[4] - 6); /* LH2 */
 
45
        rfx_quantization_decode_block(buffer + 3584, 256, quantization_values[6] - 6); /* HH2 */
 
46
        rfx_quantization_decode_block(buffer + 3840, 64, quantization_values[2] - 6); /* HL3 */
 
47
        rfx_quantization_decode_block(buffer + 3904, 64, quantization_values[1] - 6); /* LH3 */
 
48
        rfx_quantization_decode_block(buffer + 3968, 64, quantization_values[3] - 6); /* HH3 */
 
49
        rfx_quantization_decode_block(buffer + 4032, 64, quantization_values[0] - 6); /* LL3 */
 
50
}
 
51
 
 
52
static void rfx_quantization_encode_block(sint16* buffer, int buffer_size, uint32 factor)
 
53
{
 
54
        sint16* dst;
 
55
        sint16 half;
 
56
 
 
57
        if (factor == 0)
 
58
                return;
 
59
 
 
60
        half = (1 << (factor - 1));
 
61
        for (dst = buffer; buffer_size > 0; dst++, buffer_size--)
 
62
        {
 
63
                *dst = (*dst + half) >> factor;
 
64
        }
 
65
}
 
66
 
 
67
void rfx_quantization_encode(sint16* buffer, const uint32* quantization_values)
 
68
{
 
69
        rfx_quantization_encode_block(buffer, 1024, quantization_values[8] - 6); /* HL1 */
 
70
        rfx_quantization_encode_block(buffer + 1024, 1024, quantization_values[7] - 6); /* LH1 */
 
71
        rfx_quantization_encode_block(buffer + 2048, 1024, quantization_values[9] - 6); /* HH1 */
 
72
        rfx_quantization_encode_block(buffer + 3072, 256, quantization_values[5] - 6); /* HL2 */
 
73
        rfx_quantization_encode_block(buffer + 3328, 256, quantization_values[4] - 6); /* LH2 */
 
74
        rfx_quantization_encode_block(buffer + 3584, 256, quantization_values[6] - 6); /* HH2 */
 
75
        rfx_quantization_encode_block(buffer + 3840, 64, quantization_values[2] - 6); /* HL3 */
 
76
        rfx_quantization_encode_block(buffer + 3904, 64, quantization_values[1] - 6); /* LH3 */
 
77
        rfx_quantization_encode_block(buffer + 3968, 64, quantization_values[3] - 6); /* HH3 */
 
78
        rfx_quantization_encode_block(buffer + 4032, 64, quantization_values[0] - 6); /* LL3 */
 
79
 
 
80
        /* The coefficients are scaled by << 5 at RGB->YCbCr phase, so we round it back here */
 
81
        rfx_quantization_encode_block(buffer, 4096, 5);
 
82
}