WebRTC Internals 官方待整理

libjingle

The WebRTC project reuses certain components from libjingle, namely network and transport components. Documentation for libjingle can be found here.

Media Processing Classes, Structures and Enumerators

Note that, all methods, structures and enumerators in this document are declared within the webrtc namespace.   

Classes, Structures, Enumerators	Header	Description
Structures	common_types.h	Lists the structures common to the VoiceEngine & VideoEngine
Enumerators	common_types.h	List the enumerators common to the  VoiceEngine & VideoEngine
Classes	common_types.h	List the classes common to VoiceEngine & VideoEngine
class VoiceEngine	voe_base.h	How to allocate and release resources for the VoiceEngine using factory methods in the VoiceEngine class. It also lists the APIs which are required to enable file tracing and/or traces as callback messages
class VideoEngine	vie_base.h	How to allocate and release resources for the VideoEngine using factory methods in the VideoEngine class. It also lists the APIs which are required to enable file tracing and/or traces as callback messages

VoiceEngine Sub APIs

The table below summarizes the sub APIs that are currently available in VoiceEngine.

sub-API	Header	Description
VoEAudioProcessing	voe_audio_processing.h	Adds support for Noise Suppression (NS), Automatic Gain Control (AGC) and Echo Control (EC). Receiving side VAD is also included.
VoEBase	voe_base.h	Enables full duplex VoIP using G.711. NOTE: This API must always be created.
VoECallReport	voe_call_report.h	Adds support for call reports which contains number of dead-or-alive detections, RTT measurements, and Echo metrics.
VoECodec	voe_codec.h	Adds non-default codecs (e.g. iLBC, iSAC, G.722 etc.), Voice Activity Detection (VAD) support.
VoEDTMF	voe_dtmf.h	Adds telephone event transmission, DTMF tone generation and telephone event detection. (Telephone events include DTMF.)
VoEEncryption	voe_encryption.h	Adds external encryption/decryption support.
VoEErrors	voe_errors.h	Error Codes for the VoiceEngine
VoEExternalMedia	voe_external_media.h	Adds support for external media processing and enables utilization of an external audio resource.
VoEFile	voe_file.h	Adds file playback, file recording and file conversion functions.
VoEHardware	voe_hardware.h	Adds sound device handling, CPU load monitoring and device information functions.
VoENetEqStats	voe_neteq_stats.h	Adds buffer statistics functions.
VoENetwork	voe_network.h	Adds external transport, port and address filtering, Windows QoS support and packet timeout notifications.
VoERTP_RTCP	voe_rtp_rtcp.h	Adds support for RTCP sender reports, SSRC handling, RTP/RTCP statistics, Forward Error Correction (FEC), RTCP APP, RTP capturing and RTP keepalive.
VoEVideoSync	voe_video_sync.h	Adds RTP header modification support, playout-delay tuning and monitoring.
VoEVolumeControl	voe_volume_control.h	Adds speaker volume controls, microphone volume controls, mute support, and additional stereo scaling methods.

VideoEngine Sub APIs

The table below summarizes the sub APIs that are currently available in VideoEngine.

sub-API	Header	Description
ViEBase	vie_base.h	Basic functionality for creating a VideoEngine instance, channels and VoiceEngine interaction. NOTE: This API must always be created.
ViECapture	vie_capture.h	Adds support for capture device allocation as well as capture device capabilities.
ViECodec	vie_codec.h	Adds non-default codecs, codec settings and packet loss functionality.
ViEEncryption	vie_encryption.h	Adds external encryption/decryption support.
ViEErrors	vie_errors.h	Error codes for the VideoEngine
ViEExternalCodec	vie_external_codec.h	Adds support for using external codecs.
ViEFile	vie_file.h	Adds support for file recording, file playout, background images and snapshot.
ViEImageProcess	vie_image_process.h	Adds effect filters, deflickering, denoising and color enhancement.
ViENetwork	vie_network.h	Adds send and receive functionality, external transport, port and address filtering, Windows QoS support, packet timeout notification and changes to network settings.
ViERender	vie_render.h	Adds rendering functionality.
ViERTP_RTCP	vie_rtp_rtcp.h	Adds support for RTCP reports, SSRS handling RTP/RTCP statistics, NACK/FEC, keep-alive functionality and key frame request methods.