f7132b5206
Change the arrays to be continuous uint8_t arrays instead being of arrays of arrays (of arrays). Code size difference is 17K for arm, ~42K for arm64. New lookup algorithm, tailored for these two tables + tests. Instead of returning a raw pointer into the table, the algorithm returns an ArrayView, which includes size information for how much memory can be read. Change-Id: I000b094520bac944e518eb8b51d8dbef4670f5d7 Bug: webrtc:9102 Reviewed-on: https://webrtc-review.googlesource.com/65920 Reviewed-by: Stefan Holmer <stefan@webrtc.org> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Commit-Queue: Tommi <tommi@webrtc.org> Cr-Commit-Position: refs/heads/master@{#22736}
40 lines
1.7 KiB
C++
40 lines
1.7 KiB
C++
/*
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* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_RTP_RTCP_SOURCE_FEC_PRIVATE_TABLES_BURSTY_H_
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#define MODULES_RTP_RTCP_SOURCE_FEC_PRIVATE_TABLES_BURSTY_H_
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// This file contains a set of packets masks for the FEC code. The masks in
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// this table are specifically designed to favor recovery of bursty/consecutive
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// loss network conditions. The tradeoff is worse recovery for random losses.
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// These packet masks are currently defined to protect up to 12 media packets.
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// They have the following property: for any packet mask defined by the
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// parameters (k,m), where k = number of media packets, m = number of FEC
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// packets, all "consecutive" losses of size <= m are completely recoverable.
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// By consecutive losses we mean consecutive with respect to the sequence
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// number ordering of the list (media and FEC) of packets. The difference
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// between these masks (|kFecMaskBursty|) and |kFecMaskRandom| type, defined
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// in fec_private_tables.h, is more significant for longer codes
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// (i.e., more packets/symbols in the code, so larger (k,m), i.e., k > 4,
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// m > 3).
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#include <cstddef>
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#include "typedefs.h" // NOLINT(build/include)
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namespace webrtc {
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namespace fec_private_tables {
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extern const uint8_t kPacketMaskBurstyTbl[];
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} // namespace fec_private_tables
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} // namespace webrtc
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#endif // MODULES_RTP_RTCP_SOURCE_FEC_PRIVATE_TABLES_BURSTY_H_
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