src/modules/video_coding/main/source/er_tables_xor.h

/*
 *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#ifndef WEBRTC_MODULES_VIDEO_CODING_SOURCE_ER_TABLES_XOR_H_
#define WEBRTC_MODULES_VIDEO_CODING_SOURCE_ER_TABLES_XOR_H_

// This is a private header for media_opt_util.cc.
// It should not be included by other files.

namespace webrtc {

// Table for average FEC recovery from packet loss, for XOR code.
// From RPL model of random loss.
// Input is the received packet loss (up to 50%), and FEC code parameters
// (up to 24x24):
// i.e., kAvgFECRecoveryXOR[k] where k = code_i*129 + loss_j;
// code_i=1x1,2x1,2x2,..24x24, loss_j = 0,1,..128.

// Maximum number of source packets in off-line model
static const int kMaxNumPackets = 24;
// Max value of loss rates in off-line model
static const int kPacketLossMax = 129;

// Table size for model is: kPacketLossMax * numberOfFecCodes = 38700
// numberOfFecCodes is determined as:
// {(1,1), (2,1), (2,2),...(n,1),..(n,n-1), (n,n)} = n*(n+1)/2
// for n = kMaxNumPackets.
static const int kSizeAvgFECRecoveryXOR = 38700;
static const unsigned char kAvgFECRecoveryXOR[kSizeAvgFECRecoveryXOR] = {
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27,
26,
26,
26,
25,
25,
25,
24,
24,
24,
23,
23,
23,
22,
22,
22,
21,
21,
21,
20,
20,
20,
19,
19,
18,
18,
18,
17,
17,
17,
16,
16,
16,
15,
15,
15,
14,
14,
14,
13,
13,
13,
12,
12,
0,
0,
1,
2,
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18,
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20,
21,
22,
23,
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27,
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31,
31,
32,
32,
33,
33,
34,
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35,
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37,
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38,
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40,
40,
40,
40,
40,
40,
40,
40,
39,
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39,
39,
39,
39,
39,
38,
38,
38,
38,
37,
37,
37,
37,
36,
36,
36,
35,
35,
35,
34,
34,
33,
33,
33,
32,
32,
31,
31,
30,
30,
29,
29,
29,
28,
28,
27,
27,
26,
26,
25,
25,
24,
24,
23,
23,
22,
22,
21,
21,
20,
20,
20,
19,
19,
18,
18,
17,
0,
0,
1,
2,
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17,
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21,
22,
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25,
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31,
31,
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33,
34,
34,
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36,
35,
35,
34,
34,
33,
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32,
31,
31,
30,
30,
29,
28,
28,
27,
27,
26,
25,
0,
0,
1,
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19,
20,
21,
22,
23,
24,
25,
26,
27,
28,
29,
30,
30,
31,