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[9] - 2026.09.29

Version: 0.2.1-alpha.11 Added
  • Added D3D11 video rendering: srtcLive adds D3D11VideoRender and the underlying D3D11 rendering module (device and swap chain, YUV textures, shaders, full-screen quad, text and watermark overlays, etc.)
  • utils adds D3d11Support() detection; when creating video rendering, D3D11 is preferred on machines that support it (SRTC_RENDER_MODEL_VIDEO_D3D11), falling back to the existing D3D rendering when it isn’t supported
Changed
  • The srtc / srtcLive projects add d3d11 and other related dependencies, and enable the C++17 standard
  • RenderModel adds SRTC_RENDER_MODEL_VIDEO_D3D11 (controlled by the compile macro SRTC_USEING_LIB_D3D)
API changes None. srtc.h / srtc_def.h are unchanged in this release and the vtable is unchanged, so you only need to replace the DLLs; no recompile is needed.

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[8] - 2026.09.24

Version: 0.2.1-alpha.10 Added
  • Added an x64 (64-bit) package; delivery is now two packages, x86 + x64:
    • rtc-win-sdk-2.1.zip (x86, 32-bit)—the package name is exactly the same as before
    • rtc-win-sdk-x64-2.1.zip (x64, 64-bit)—new; the package name has an extra -x64 segment before the version number
    The two packages have the same internal structure (the root directory is rtc_dll/ in both), but srtc.dll, srtcLive.dll, and srtc.lib differ in bitness, so don’t mix them or extract them into the same directory. Choose the package that matches your project’s target platform. For download links, see Integration.
  • Dependencies are split by architecture into two sets, lib/<library>/lib/win32 and lib/<library>/lib/win64
Changed
  • Fixed the x64 project configuration of srtcLive: the output type changed from Application to DynamicLibrary, x64 now has its own include and library directories (pointing to lib/*/lib/win64), and output goes to Release_x64
  • Upgraded third-party dependencies: libfaac switches to the new encoder API (faac_encoder_open / faac_encoder_get_info / faac_encoder_encode), libswresample switches to swr_alloc_set_opts2, and the openh264 header path changes from wels/ to svc/; removed the no-longer-used x264, webrtc_aec3, rtpsdk, and pthread dependencies
  • utils::getPathFile now uses std::filesystem to enumerate directories
  • operator<<(size_t) of the log stream SDebug changed to operator<<(unsigned int): on 64-bit, size_t is unsigned __int64 and conflicts with the uint64_t overload. After the change, 32-bit unsigned values hit this overload and 64-bit values hit uint64_t, so both architectures behave the same
  • Added the RTC_ENABLE_RTP_STREAM compile switch to custom/rtp stream code
Fixed
  • Fixed 64-bit build errors: the virtual machine detection in IsInsideVPC / IsInsideVMWare relies on x86 inline assembly and x86-only CONTEXT fields (Ebx / Eip), and MSVC doesn’t support inline assembly on x64— in 64-bit builds these two checks simply return false
  • FAACEncode: closing the handle now uses faac_encoder_close(&hEncoder); encoding now checks the returned status code and the number of bytes written, avoiding misjudgments caused by changed return value semantics in the new API
API changes None. srtc.h / srtc_def.h are unchanged in this release and the vtable is unchanged, so you only need to replace the DLLs; no recompile is needed.

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[7] - 2026.09.22

Version: 0.2.1-alpha.9 Changed
  • Refactored webrtc2 reconnection and thread safety: web_pccontrol2 protects peer / _recv / _pc_stat with locks, statistics and subscription state use value-copy snapshots, and state read and written across threads (_use / _status, etc.) uses atomic variables
  • After reconnecting, publishing and subscriptions are restored from the subscription snapshot, and the send/receive packet statistics baseline is reset (so rates and packet loss rates don’t come out negative after a reconnect)
  • SetRemoteDescription failures are propagated upward, so a failed handshake is no longer marked as connected
  • Unified the default encoding of source files (fixes C4819 warnings and potential garbled text from UTF-8 Chinese comments in a GBK environment)
  • Cleaned up the stream initialization object (SRTCChannel)
Fixed
  • Fixed CreateOffer / CreateAnswer waiting forever for the SDP callback, which caused the pubsub thread and CloseRoom to deadlock when leaving the channel: they now wait with a timeout
API changes None. srtc.h / srtc_def.h are unchanged in this release and the vtable is unchanged, so you only need to replace the DLLs; no recompile is needed.

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[6] - 2026.08.21

Version: 0.2.1-alpha.7 Changed
  • After join() succeeds, opt is now parsed separately per media streaming type (stream_vendor): link_id, session_key, upload.address, and upload.port are required only when stream_vendor is ook, and link_id (the OOK room number) in the channel info is likewise required only under OOK
  • Cleaned up the indentation of UploadLog::appendLog2Map (no functional change)
Fixed
  • Fixed an issue where, with WebRTC media streaming (stream_vendor other than ook), the absence of link_id / session_key in opt caused an early return in onJoinSucceed, so no stream was set up after joining the channel
API changes None. srtc.h / srtc_def.h are unchanged in this release and the vtable is unchanged, so you only need to replace the DLLs; no recompile is needed.

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[5] - 2026.08.20

Version: 0.2.1-alpha.6 Added
  • Added IRTCChannel: one object per channel, with all channel-level methods on it
  • Added IRTCChannelEvent: channel-level callbacks are now a separate interface, registered per channel
  • Added IRTCEngine::createChannel(token, IRTCChannel**): creates only the channel object without joining the channel, so you can set up the configuration and event handler before join() (onJoinChannel fires before join() returns)
  • Added IRTCChannel::join() / getChannelId() / getSetting() / setEventHandler()
  • Added the RTCEngineOptions struct as the second parameter of RTCEngine_Init, for setting the log switch and log directory
Changed
  • IRTCEngine keeps only engine-level capabilities: creating/leaving channels, device enumeration, network speed tests, log upload, and IM
  • IRTCEngineEvent keeps only engine-level callbacks: device changes, network probing, and IM
  • IRTCSetting is renamed IRTCChannelSetting and moved from the engine to the channel (one per channel; changes to den_model / limit_speed are applied to that channel immediately)
  • Media streaming objects (IStreamBase / StreamControl / WebrtcControl / WebrtcControl2) changed from process-level singletons to one new instance per channel, released when the channel is destroyed; OOK’s any_meeting is still a process-level singleton
  • Local recording has only one recording object per channel (its key is the channelId); the mid parameter of getLocalRecord is kept only for interface compatibility
  • Adjusted file encoding formats
Fixed
  • Fixed OOK callbacks (rendering, room events, audio, custom frames) still pointing to a freed object after the media streaming object was released: StreamControl now unregisters these callbacks in its destructor
  • Fixed the thread not being reclaimed while the object was destroyed when OpenRoom failed midway: the failure path now calls CloseRoom()
  • Fixed the StreamControl thread flag not being initialized, which could make CloseRoom() wait forever if the stream info thread never started
  • Fixed web_meeting and web_meeting2 each registering AEC pre- and post-processing with the shared libwebrtc factory, overwriting each other and leaking: web_base now holds a single shared instance
  • Fixed leaks where web_meeting2 in WebrtcControl2 and the device stream object in WebrtcControl were never released
API changes (breaking; you must recompile) IRTCEngine / IRTCEngineEvent / IRTCChannel / IRTCChannelEvent / IRTCChannelSetting are all pure virtual interfaces, and this release changes their vtables; RTCEngine_Init is an exported function and its signature has also changed. Replacing only the DLLs without recompiling crashes.
  • RTCEngine_Init(IRTCEngine** rtc) → RTCEngine_Init(IRTCEngine** rtc, RTCEngineOptions* opt). Passing nullptr for opt means no SDK log is written
  • IRTCEngine::joinChannel(token, char**, int*) is removed; use createChannel(token, IRTCChannel**) + IRTCChannel::join() instead
  • IRTCEngine::getSetting() is removed; use IRTCChannel::getSetting() instead
  • The 24 channel-level methods on IRTCEngine with a leading channelId parameter are all removed (no compatibility forwarding is kept) and moved to IRTCChannel, with the signature simply dropping channelId: getMe, getChannel, getMembers, getMember, getMemberByLinkId, getLocalRecord, getCameraTrack, getScreenTrack, getAudioTrack, getRemoteAudioTrack, getRemoteVideoTrack, getMCUVideoTrack, getCustomVideoTrack, getCustomAudioTrack, setCustomRecvBack, subscribe, unsubscribe, publish, updatePublish, unpublish
  • getMCUVideoTrack now takes no parameters
  • The 21 channel-level callbacks of IRTCEngineEvent are all moved to IRTCChannelEvent, and their leading channelId parameter is removed: onJoinChannel, onChannelUpdate, onUserJoin, onUserUpdate, onUserLeave, onUserStreamAdd, onUserStreamUpdate, onUserStreamRemove, onCustomMessage2, onUpLevel, onDownLevel, onUpStat, onDownStat, onFrameTimeOut, onSpeakers, onDeviceStatusChange, onShareTargetNotFind, onDisconnected, onReconnected, onReconnecting, onRecordStatusChange
  • IRTCSetting → IRTCChannelSetting, and sdk_log_path / enable_stream_log are removed (moved to RTCEngineOptions)
Known limitations
  • stream_model / simple / mcu_track / enable_audio_record in IRTCChannelSetting are read during join(); changing them after join() has no effect
  • An IRTCChannel* becomes invalid after leaveChannel / leaveAllChannel, and you need to set it to null yourself; there’s no reference counting, so don’t hold it on another thread and use it across leaveChannel

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[4] - 2026.08.19

Version: 0.2.1-alpha.5 Added
  • Support for joining multiple channels at the same time; the engine manages multiple channels internally by channelId
  • Added leaveAllChannel() to leave all joined channels at once
  • Added getChannelIds() to get the list of currently joined channelIds
  • Added a CMake build project and adjusted the directory structure
Changed
  • Separated channel and client; each channel holds its own independent session / roomno / stream_host / user_id configuration
  • Cleaned up audio sync for screen sharing; cleaned up screen recording; cleaned up synchronous pushing in updateSenderPublish
  • Moved message callbacks to the recording task
  • WebRTC local recording supports writing audio data to the file
  • Removed garbled comments
Fixed
  • Fixed the audio levels during recording
  • Fixed a crash when ending SeaStart screen sharing with audio
API changes (breaking; you must recompile) IRTCEngine / IRTCEngineEvent are pure virtual interfaces, and this release changes their vtables, so replacing only the DLLs without recompiling crashes.
  • joinChannel changes to joinChannel(const char* token, char** channelId, int* channelIdSize), returning the channelId through an output parameter
  • leaveChannel changes to leaveChannel(const char* channelId)
  • All channel-level methods add a leading channelId parameter: getMe, getChannel, getMembers, getMember, getMemberByLinkId, getLocalRecord, getCameraTrack, getScreenTrack, getAudioTrack, getRemoteAudioTrack, getRemoteVideoTrack, getMCUVideoTrack, getCustomVideoTrack, getCustomAudioTrack, subscribe, unsubscribe, publish, updatePublish, unpublish
  • All channel-level callbacks add a leading channelId parameter: onJoinChannel, onCustomMessage2, onUpLevel, onDownLevel, onUpStat, onDownStat, onFrameTimeOut, onSpeakers, onDeviceStatusChange, onShareTargetNotFind, onDisconnected, onReconnecting, onRecordStatusChange
  • The first parameter of onJoinChannel is now the plain channel ID; the original channel info JSON moves to the second parameter
  • The first parameter of onReconnected is renamed from channel to channelId, with the same meaning
  • The two publish overloads drop their default argument (the old publish(tk) was itself an ambiguous call and didn’t compile), so you must pass opt explicitly
  • Device change (onDeviceChange, onDefDeviceChange), network probing (onProbeResult), and the IM callbacks are engine-level, and their signatures are unchanged
  • When channelId is nullptr or an empty string and only one channel has been joined, that channel is used automatically, to ease migrating old code

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[3] - 2026.03.9

Added
  • Added local recording
  • Added cdn-webrtc stream receiving
  • Added stream receiving over in-house WebRTC
  • Added bandwidth limiting
Changed Converted the documentation to Markdown

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[2] - 2025.01.8

Added
  • Added logging to the log system
  • Set Opus as the default codec
  • Added retrieval of the composite stream
  • Changed random number generation

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[1] - 2022.05.30

Added
  • System playback and capture volume detection
Changed
  • Merged the media stream success event and the join-channel event
  • Changed some function names and return value contents
  • Screen sharing supports sharing a window and enumerating window info

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[0] - 2022.05.15

Added
  • Initial release of rtc2.0