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| 1 /* |
| 2 * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license |
| 5 * that can be found in the LICENSE file in the root of the source |
| 6 * tree. An additional intellectual property rights grant can be found |
| 7 * in the file PATENTS. All contributing project authors may |
| 8 * be found in the AUTHORS file in the root of the source tree. |
| 9 */ |
| 10 |
| 11 #ifndef WEBRTC_MODULES_RTP_RTCP_INCLUDE_FLEXFEC_SENDER_H_ |
| 12 #define WEBRTC_MODULES_RTP_RTCP_INCLUDE_FLEXFEC_SENDER_H_ |
| 13 |
| 14 #include <memory> |
| 15 #include <vector> |
| 16 |
| 17 #include "webrtc/base/basictypes.h" |
| 18 #include "webrtc/base/random.h" |
| 19 #include "webrtc/base/sequenced_task_checker.h" |
| 20 #include "webrtc/config.h" |
| 21 #include "webrtc/modules/include/module_common_types.h" |
| 22 #include "webrtc/modules/rtp_rtcp/include/flexfec_sender.h" |
| 23 #include "webrtc/modules/rtp_rtcp/source/rtp_header_extension.h" |
| 24 #include "webrtc/modules/rtp_rtcp/source/rtp_packet_to_send.h" |
| 25 #include "webrtc/modules/rtp_rtcp/source/ulpfec_generator.h" |
| 26 #include "webrtc/system_wrappers/include/clock.h" |
| 27 |
| 28 namespace webrtc { |
| 29 |
| 30 class RtpPacketToSend; |
| 31 |
| 32 class FlexfecSender { |
| 33 public: |
| 34 FlexfecSender(int payload_type, |
| 35 uint32_t ssrc, |
| 36 uint32_t protected_media_ssrc, |
| 37 const std::vector<RtpExtension>& rtp_header_extensions, |
| 38 Clock* clock); |
| 39 ~FlexfecSender(); |
| 40 |
| 41 // Sets the FEC rate, max frames sent before FEC packets are sent, |
| 42 // and what type of generator matrices are used. |
| 43 void SetFecParameters(const FecProtectionParams& params); |
| 44 |
| 45 // Adds a media packet to the internal buffer. When enough media packets |
| 46 // have been added, the FEC packets are generated and stored internally. |
| 47 // These FEC packets are then obtained by calling GetFecPackets(). |
| 48 // Returns true if the media packet was successfully added. |
| 49 bool AddRtpPacketAndGenerateFec(const RtpPacketToSend& packet); |
| 50 |
| 51 // Returns true if there are generated FEC packets available. |
| 52 bool FecAvailable() const; |
| 53 |
| 54 // Returns generated FlexFEC packets. |
| 55 std::vector<std::unique_ptr<RtpPacketToSend>> GetFecPackets(); |
| 56 |
| 57 // Returns the overhead, per packet, for FlexFEC. |
| 58 size_t MaxPacketOverhead() const; |
| 59 |
| 60 private: |
| 61 // Utility. |
| 62 Clock* const clock_; |
| 63 Random random_ GUARDED_BY(sequence_checker_); |
| 64 int64_t last_generated_packet_ms_ GUARDED_BY(sequence_checker_); |
| 65 rtc::SequencedTaskChecker sequence_checker_; |
| 66 |
| 67 // Config. |
| 68 const int payload_type_; |
| 69 const uint32_t timestamp_offset_; |
| 70 const uint32_t ssrc_; |
| 71 const uint32_t protected_media_ssrc_; |
| 72 // Sequence number of next packet to generate. |
| 73 uint16_t seq_num_ GUARDED_BY(sequence_checker_); |
| 74 |
| 75 // Implementation. |
| 76 UlpfecGenerator ulpfec_generator_ GUARDED_BY(sequence_checker_); |
| 77 RtpHeaderExtensionMap rtp_header_extension_map_ GUARDED_BY(sequence_checker_); |
| 78 }; |
| 79 |
| 80 } // namespace webrtc |
| 81 |
| 82 #endif // WEBRTC_MODULES_RTP_RTCP_INCLUDE_FLEXFEC_SENDER_H_ |
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