# Unreleased

# 0.23.1

  * Guard SRTP/SRTCP and RTCP parsing against malformed input #1029

# 0.23.0

  * Respond to RRTR with DLRR #1022
  * Use a local SSRC as the originator of outgoing RRTR reports #1027
  * Add `DirectApi::send_pli_feedback` to send a PLI with a chosen sender SSRC #1025

# 0.22.0

  * Make audio and video RTCP report intervals configurable #1021
  * Stop padding media packets, no crypto need it #1023
  * Reset SCTP streams when closing data channels and safely reuse stream IDs #1010
  * Fix small padding invisible to the pacer #1020
  * Fix H.264 negotiation: accept a negotiable (downgradable) level and recognize the Constrained High profile #1016
  * Expose the latest send queue information on `StreamTx` #1005
  * Expose locally calculated interarrival jitter on `MediaIngressStats` #997
  * Fix VP9 non-flexible SS advertising a bogus R=0 GOF for single-layer streams #999
  * Fix AV1 depacketizer overflow on unsized OBU aggregation #1002
  * Support G722 audio codec (16 kHz codec with 8 kHz RTP clock per RFC 3551) #992
  * Support RFC 3389 Comfort Noise payloads #1013
  * Apply reliability parameters to a DCEP-receiving in-band channel #1004
  * Normalize `Rtc` shutdown and drain RTCP, SCTP, and DTLS close output consistently #1000
  * Fix an infinite loop when DTLS timeout handling fails #1017

# 0.21.0

  * Upgrade to  dimpl 0.7.0 (breaking)
  * Handle SctpAssociation as Event::Closed #986
  * Reject SDP payload types > 127 instead of panicking when claiming PTs #983
  * Add RTCP PSFB FMT=15 (AppSpecificFeedback) send/receive via Direct API #981
  * Add H266/VVC RTP packetizer and depacketizer #971
  * Negotiate SCTP max message size for data channels #852
  * Expose the negotiated DTLS protocol version #979
  * Make MTU size configurable #967
  * Add optional `drv` feature for using public identity types as `drv::Input` #974 #975
  * Send DTLS `close_notify` on `Rtc::close()` #956
  * Fix `Simulcast::add_recv_layer` to push to recv instead of send #968
  * Accept any non-empty SDP session name (`s=`), not just `s=-` #969

# 0.20.0

  * Update dimpl to 0.6.2 and sctp-proto to 0.9.1
  * Fix repeated rx lookup cleanup bug #965
  * Fix permissive vp8 depacketizer for invalid `l=1,t=0` cases (breaking) #963
  * Add VP8 descriptor parsing and `vp8_patch()` to `RtpWrite` #963
  * `write_rtp()` now takes a `RtpWrite` builder (breaking) #963
  * Add `abs-capture-time` writer support and fixed receiver-side (breaking) #964
  * Add stereo to opus format params #955
  * Use `Arc<[u8]>` as input/output of media data (breaking) #959

# is-0.9.1

  * Expose ICE candidate pair RTT in CandidatePairStats #962

# 0.19.0

  * Expose H265 some already referenced profile structs #948
  * Update to dimpl 0.6.1
  * Update openssl to 0.10.78

# is-0.9.0

  * IceCandidate expose str0m/is-unique local property #951
  * Implement ICE role conflict resolution #950

# 0.18.1

  * dtls: fix to resends during handshake #943
  * Add `SdpApi::stop_media()` to stop an existing m-line #941
  * Update chat example to use `SdpApi::stop_media()` when clients are removed #941
  * Accept recycled m-line indexes when the previous m-line was stopped #941
  * Always use ActPass when sending an SDP offer (RFC 8842 Section 5.2/5.5) #893
  * Fix frame drops in Firefox due missing RTX SSRC #940
  * Drop stale depacketizer state on stream pause and restore paused timestamp repair #929
  * Reduce bounds checks in STUN encode/decode #931

# 0.18.0

  * Disable server cookie for all dimpl crypto impl #923
  * Implement SNAP and sctp-init #811
  * Implement wincrypto-dimpl feature #920
  * Implement openssl-dimpl feature #919
  * Update to dimpl 0.5.0 #916
  * Refactor out new crate "is" (ice agent) #912
  * Expose CSRC property in RTP Header #910
  * Fix jitter calculation in ReceiverReports #907
  * Preserve nomination on redundant pair replacement #908

# 0.17.0

  * Update to dimpl 0.4.3 #902
  * Update ~dimpl to 0.4.2~ (see 902) and sctp-proto to 0.8.1 #892
  * Update ~dimpl to 0.3.0~ (see 902) #874
  * MSRV 1.85, Edition 2024 and bump deps #891
  * Reduce allocations in AV1 packetizer/depacketizer #889
  * Workaround DCEP panics due to reuse race condition #883
  * sprop-max-don-diff SDP parameter #885
  * Reduce number of RTP header extensions sent on every packet #880
  * Add RTP-level keyframe detection for VP8, VP9, AV1, H264 and H265 #869
  * VP9 switch packetizer to non-flexible mode (F=0) #868
  * Fix H265 SDP negotiation level handling #872
  * Avoid sending VLA on every packet #866
  * Add `abs-capture-time` RTP header extension #864
  * Adjust `IceAgent::ice_timeout` to return timeout of successful pair #875
  * Fix infinite loop on in-band data channel stream conflict #873
  * Add `Hash`, `PartialOrd` and `Ord` traits to `TransId` #905
  * Fix m-line ordering when using sdp `merge()` #887

# 0.16.2

  * Fix hot timeout loop with null pacer #863
  * H265 to use is_irap() for keyframe detection #859
  * Fix probe estimator panic when probes accumulate #857
  * Improve H265 test coverage and organization #853
  * Add `DirectApi::invalidate_candidate()` #858

# 0.16.1

  * Fix two AV1 packetizer panics #854
  * Fix ICE disconnections with Chrome v144+ when not using ICE Lite #846
  * Downgrade noisy BWE logs #847
  * Fix H265 PACI depacketizer panic on short payload #849

# 0.16.0

  * Constant stream timeout check #845
  * H265 Packetizer/Depacketizer #822
  * Cap amount SCTP (data channels) buffer #831
  * Fix incorrectly purged ice-lite pairs #832
  * Provide start Instant in constructor (breaking) #843
  * Fix bug in dimpl resend logic (dimple 0.2.4) #842
  * Fix bug in dimpl HelloVerifyRequests (dimpl 0.2.3) #841
  * Stable RNG for tests with dimpl (dimpl 0.2.3) #841
  * BWE remove current_bitrate param (breaking) #838
  * BWE V2 (Probe clusters) #823

# 0.15.0

  * MediaData::is_keyframe() helper #805
  * Handle tcptype ICE candidates #797
  * New API for building ICE Candidates (breaking) #797
  * AV1 Packetizer/Depacketizer #819
  * Surface Sender Info as Event (breaking) #820
  * Improve performance on apple crypto #818 #821
  * Crypto compliance tests #817
  * Fix HMAC P_hash implementation for Apple Crypto #824
  * Update Apple Crypto crate to use CryptoKit #813

# 0.14.3

  * Bump dimpl 0.2.1 for SChannel compat #801
  * Reduce allocating in `str0m-aws-lc-rs` encrypt/decrypt #804

# 0.14.2

  * Fix order of DTLS pending packet poll #796
  * Defer panic on missing crypto provider until Rtc init #792

# 0.14.1

  * Configure sctp to not give up INIT/data retransmissions #791
  * update sctp-proto to 0.6.0 #791
  * wincrypto: queue data until handshake completes #787
  * openssl: queue data until handshake completes #787

# 0.14.0

  * RTT as Duration #756
  * Revise Simulcast layer API #784
  * Fix max-bundle bug introduced in 0.13 #786
  * Reduce reallocation when depacketizing #782
  * Network emulation for tests #774
  * Handle SSRC 0 BWE probe #769
  * Apple Crypto backend #763
  * Move all crypto backends out of main crate #768
  * h264 profile/level matching comply with RFC 6184 #758
  * Constant time HMAC equality #753

# 0.13.0

  * Simulcast send attributes RFC 8851 #780
  * Handle rejected m-lines (set port 0 etc) #772
  * Expose Opus packetizer #770
  * Handle incoming SSRC 0 BWE probe #769
  * New CryptoProvider API #760
  * Update H.264 profile and level matching logic #758
  * Use constant time equality in some key places #753
  * Fix off-by-one nack reports #748

# 0.12.0

  * Bump str0m-wincrypto to 0.2.1
  * str0m-wincrypto crate: fix double-free #751
  * Represent NTP as SystemTime in SenderReports #735
  * Fix bug in PT remapping to unlocked PTs #734
  * Fix PT conflict when using Firefox #730
  * Rename Sample level API -> Frame level API #732
  * Add new non-openssl DTLS under `dimpl` feature #708
  * Expose packetizers under `unversioned` feature #718
  * Fix bug when TWCC sequence starts above 32768 #717

# 0.11.1

  * stun: stricter string parsing #712
  * Tweak DirectAPI fingerprint() calls (breaking) #711
  * Restore disabling RtcConfig.fingerprint_verification #711
  * Fix panic width incorrect STUN packet #709

# 0.11.0

  * Bump str0m-wincrypto to 0.2.0
  * Remove str0m/wincrypto use of thiserror #704 #706
  * Channel::config() to get data channel config #702
  * fix `Vp9Depacketizer` failing on high scalability modes #701
  * srtp: support (and prefer) AES_256_GCM #697
  * bwe: fix panic on history monotonicity assert in `TrendlineEstimator` #700
  * ice: fix panic on STUN Binding Indication #690

# 0.10.0

  * Channel::buffered_amount/set_buffered_amount #688
  * Support PCMu/PCMa #685
  * Make STUN timers configurable on RtcConfig #674
  * ice: stricter srflx candidate checks #672
  * ice: Dont report Disconnected when no local candidates #670
  * ice: expose remote ICE credentials #675
  * ice: transition from `Disconnected -> Checking` on new candidates #676
  * Make ICE agent local preference pluggable #668
  * Simplified serde of SDP #664
  * SR/RR stats in Ingress/EgressStats #661 #662

# 0.9.0

  * Wincrypto fail on drop #660
  * All logging on DEBUG and lower #658
  * Redact PII (ip addresses) in logs #656
  * Document behavior of MediaAdded #655
  * Fix growing feedback bug before ICE #654
  * Fix vp8 depacketize for small packets #653
  * Bust cache on config change #649
  * RTT in PeerStats #648
  * Fix off-by-one SDES size calculation #647
  * Increase ufrag size to 16 #646
  * `add_local_candidate` return candidate on success #650

# 0.8.0

  * Add start of talkspurt for sample writer #645
  * Avoid overwriting acked SCTP association #643
  * Fix bug misparsing SDES #641
  * Prefer relayed candidates with matching IP versions #640
  * Add stats for the selected candidate pair #638
  * Optional integrity on STUN messages #632
  * Support for most of TURN's messages in STUN #631
  * Reset cached nack flag #629
  * Only reset deplayloader if SSRC did change #628
  * SSRC changes reset StreamRx state #627
  * Direct API reset_stream_tx() call #626
  * Handle very long media pauses #625

# 0.7.0

  * Spoof raddr in srflx relay candidate #621
  * Support AV1-specific media format parameters #619
  * Support negative time deltas in BWE #615
  * Remove restriction on EC to use on ECDH exchange #616
  * Don't retain Receiver Report loss info when stats are disabled #614
  * Fix RIDs bug on updating non-simulcast media #612
  * Support writing VLA #603
  * Ensure BWE calculation exactly follows libWebRTC #608
  * Add EC-DSA custom certificate common names #607
  * Fix multiple bugs in TWCC #605 #606 #601
  * Support sending simulcast (breaking) #603
  * Wincrypto support #589

# 0.6.3

  * Add warning log when exceeding max number of pairs #587
  * Add fuzz to Nightly CI #585
  * Add new loss based BWE controlled #579 #582 #583
  * Add new `vendored` feature flag affecting openssl #580
  * Make use of sha1 crate an optional feature #577
  * Dedupe remote ICE candidates #576 #578
  * Correctly handle per m-line Absolute Send Time #575
  * Correctly handle per m-line TWCC #573
  * Configure RTX ratio cap via `StreamTx::set_rtx_cache` #570
  * Match remote candidate of stun request by priority #569
  * Improve timeouts during DTLS handshake #565
  * Do not decrypt already received packets #554
  * Test for SRTP replay attack #555
  * refactor(ice): always use latest timing config #568
  * Fix RTX stops working after packet loss spike #566
  * Add Sub trait impl (back) to MediaTime #560
  * Make start of talkspurt information available for frame api #559
  * Do not disconnect whilst we still check new candidates #489
  * Ensure lexical ordering of SDP-formatted candidates follows priority #557
  * Limit TWCC iteration with packet status count #606
  * Dedupe acked packets from `TwccSendRegister::apply_report()` #601, #605
  * Align BWE ArrivalGroup calculation with libwebrtc implementation #608, #615
  * Support AV1-specific media format parameters #619

# 0.6.2

  * Fix edge case breaking DTLS #531
  * Bump sctp-proto to be compatible with libdatachannel #558
  * Ensure not risk of ROC on initial sequence number #553
  * API for getting stream_id/track_id from a=msid #550
  * Use a=extmap-allow-mixed SDP attribute #551
  * Change the unix_time function to return libc::time_t (32-bit compat) #533
  * Fix bug using unreliable channels by default #548
  * New add_channel_with_config() for configured data channels #548

# 0.6.1
  * Force openssl to be >=0.10.66 #545
  * Fix bug when replacing redundant ice candidates #544
  * Add playout_delay builder function #543

# 0.6.0

  * Doc updates
  * IceAgent make timeout values configurable #537
  * Log more details when failing to decrypt SRTP #536
  * Remember max SeqNo per SSRC for reuse ROC #535
  * Only update NACK/TWCC registers after succesful SRTP decrypt #528
  * Fix bug when changing StreamRx SSRC #522
  * Simplify StreamRx lookup state cache #522
  * Fix bug in TWCC time delta #524
  * Make MediaTime nominator unsigned (breaking) #521
  * Provide reason for timeout #520
  * Reject ice-lite - ice-lite scenario #519
  * Fix bug in ice agent roles for ice-lite #519
  * DLTS cert serial number as random instead of sequential #518
  * IceAgent make timing advance (TA) configurable #515
  * Use sha1 crate instead of the deprecated sha-1 #512
  * Bump sctp-proto to 0.2.2 #511
  * Adjust logging levels to be less noisy #510
  * Fix crash when using VLA (or other) optional RTP exts with SDP #509
  * Re-add manually invalidated IceAgent candidates #508
  * New API to reset BWE state #506
  * Change parameter in BWE algo to match libwebrtc #506

# 0.5.1

  * Expose STUN packet split_username() fn #505
  * IceAgent fix to not invalidate unrelated remote candidates #504
  * Expose ice credentials as configuration option #502
  * Bug fix in lazy NACK handling #501
  * Net structs Transmit/Receive serde Serializable #500
  * Payload matching for VP9 #499
  * IceAgent allow invalidating remote candidates #498
  * Avoid panic on too early DTLS traffic #495
  * `IceAgent::handle_packet` return false if packet not accepted #493
  * Don't panic on STUN requests for unknown NICs #493
  * Improve IceAgent `accepts_message` to avoid panic in some situations #488

# 0.5.0
  * Opus DTX support #492
  * RtcConfig does not generate the ICE creds #491
  * Accept all good remote address candidates, not just the nominated #487
  * Improve performance by only calling `init_time` once #479
  * Fix SCTP channel ID allocation bug when reusing channels #470
  * Fix bug causing nomination of ICE candidate pair that isn't better #463
  * Lower STUN_TIMEOUT for quicker connection checking #462
  * Fix bug making SCTP fail under packet loss #482
  * Add `base` parameter to `Candidate::server_reflexive` (breaking) #455
  * Refactor all OpenSSL (and other crypto code) to mod crypto #449
  * Fix bugs in RTX PT selection for BWE padding #454
  * Don't enable NACK timers unless there are stream to nack
  * Fix bug in BWE trendline estimator
  * Fix (unlikely) nack overflow error
  * Speed up twcc register updates using max_seq()
  * Parse `StunMessage` without allocations (and huge STUN parsing cleanup)
  * Introduce top-level `ice` module having `ice::IceAgent` for standalone usage
  * Remove `StunError::Other` because it was unused
  * Optional parser for VLA (Video Layers Allocation) RTP header extension
  * Chat example send PLI on RTC sequence interruption
  * VP9 contiguity checks in depacketizer
  * Improved VP9 support with parsing layer metadata
  * Fix race in chat example on client disconnect
  * MediaTime improve safety with Frequency newtype (breaking)
  * Header extension abs_send_time is now an Instant
  * Handle more optional a=candidate parameters
  * Support REMB (receiver estimated maximum bitrate) feedback packets (breaking)

# 0.4.1
  * Generated DTLS certificates set issuer/subject for compat with OBS/libdatachannel

# 0.4.0
  * Allow SDP RID with `~` prefix (to indicate paused state)
  * Fix problem with using RTX for audio
  * Make IceCandidate serializable to SDP form (to/from_sdp_string)
  * UserExtensionValues set_arc/get_arc to avoid cloning
  * Provide correct Rid for repaired RTP headers
  * Support 2-byte header extensions
  * Remove a statistics performance bottleneck
  * New ICE Candidate types `server_reflexive` and `relayed`

# 0.3.0
  * Fix bad bug causing SCTP packets to not send
  * Improve performance by reducing Event enum size
  * SdpPendingOffer mergable into new OFFER
  * Improved VP8 temporal layer handling
  * Fix bug in discovering RTX channels due to NACK not being enabled
  * Improve NACK sending with multiple fixes to receive register
  * Fix bug where RTX channel would be allocated for audio m-lines
  * Delay creation of DtlsCert to avoid unnecessary start-up time
  * Writer take Into<Vec<u8>> to make it possible to avoid extra allocation (breaking)
  * Refactor internal time handling (unix epoch translation)
  * Fix bug in signaling media discontinuity
  * User RTP header extensions

# 0.2.0
  * Possible to disable DTLS fingerprint verification
  * Manually set local ice credentials
  * enable_raw_packets for debugging RTP/RTCP
  * ICE restart
  * SRTP: Implement AEAD_AES_128_GCM and use it by default
  * Better FMTP matching of VP8 and H264
  * Fix incorrect handling of header extensions
  * Fix incorrect handling of PT-codec assignment
  * Dynamic SSRC via MID-only RTP headers
  * Fix various undeflow and padding bugs
  * VP8: parse out metata
  * Clean separation of RtxCache from PacketizingBuffer.
  * Major refactor of Media/Stream handling (we call it "kaboom")
  * RTP Mode (directly using RTP packets)
  * Bandwidth Estimation (BWE)
  * Direct API for SDP-free control
  * SDP Api to formalize SDP handling

# 0.1.0
  * First published version