There are Licode and kurento in contact.Licode Flaw: Limited documentation support, Licode app client library only JSKurento Advantages: Complete Documentation, demo-ready, Packaging API is more complete. Its main features are:
Networked streaming protocols, including HTTP, RTP and WebRTC.
Group Communications (MCUs (Multipoint Conferencing Unit) and Sfus (Selective Forwarding unit.) functionality) Supporting B Oth Media mixing and media
Today let me find a gstreamer of a bull fork of the killer, the mind immediately thought of a general framework and plan, with Gst-inspector first object introspection property detection, and then sacrificed Gst-launcher Broadsword for pipeline test, and finally use C to achieve the pipeline logic source code , you can implement WEBRTC-based video surveillance and live streaming services. Real-time two-person video call or multi-person meeting, after
The WEBRTC audio and video parsing process consists of multiple threads:1. RTP Network stream receive thread (RTP stream reciever thread)2. Audio and video decode thread (decode thread)3. Render threads (render thread)RTP network stream receive thread (RTP stream reciever thread):Receive network RTP packets, parse RTP packets, get audio and video packets. The resolved RTP packet is added to the Rtpstreamreceiver::frame_buffer_ or eventually joined Vcm
The bandwidth adaptive algorithm in WEBRTC is divided into two types:
1, the originator bandwidth control, the principle is the RTCP in the packet loss statistics to dynamically increase or decrease the bandwidth, in the reduction of bandwidth using the TFRC algorithm to increase the smoothness.
2, the receiver bandwidth estimation, the principle is and by the receipt of RTP data, the estimated bandwidth, with the Kalman filter, the transmission time
output signal of the filter and the desired response, which is to ask for a gradient.
The AEC algorithm in WEBRTC belongs to the piecewise fast frequency domain Adaptive filtering algorithm, partioned block Frequeney Domain Adaptive filter (PBFDAF).To determine whether the distal and proximal end of the conversation, also known as double-ended detection, the following four conditions need to be monitored:1. Only the far end to speak, at this time the
WEBRTC use of audio and video engines
At the request of the group of brothers, now how to use WEBRTC audio and video demo put out. Code format is very bad, you look at the spectators do not bother to tidy up.
#include
This article provides an overview of the WEBRTC audio processing flow, as shown in the following diagram:
WebRTC an audio session is abstracted into a channel, such as A and b for audio calls, a needs to establish a channel and b for audio data transmission. The figure above has three channel, each channel contains codec and real-time Transport protocol (real-time Transport Protocol,RTP)/ The real-time Tra
output signal of the filter and the desired response, which is to ask for a gradient.
The AEC algorithm in WEBRTC belongs to the piecewise fast frequency domain Adaptive filtering algorithm, partioned block Frequeney Domain Adaptive filter (PBFDAF).To determine whether the distal and proximal end of the conversation, also known as double-ended detection, the following four conditions need to be monitored:1. Only the far end to speak, at this time the
mobile video (browse mode)4.1. Environmental requirements:4.1.1. Prepare two Android phones for 4.0 or more. Chrome browser is installed separately4.2. Demonstration steps:4.2.1. All modes of operation are the same as "Demo PC and PC video".five. Demo phone and PC video5.1. Environmental requirements:5.1.1.1 more than 4.0 Android phones.5.1.2.1 computers with a camera and microphone. And the latest version of Chrome is installed .5.2. Demonstration steps:5.2.1. Phone install and open HuRTC4.0,
Webrtc packages criticalsection, which can be used in windows and posix platforms.
The basic structure is as follows:
In the factory method, you are responsible for the creation of specific class objects, which can be called a simple factory model. A factory is responsible for the creation of all products, different products are created by inputting necessary parameters to the factory. Generally, the created products are related and inherited from an
)
Minframeinterval
The minimum frame duration, in 100-nanosecond units. This value is applies only to capture filters.
Maxframeinterval
The maximum frame duration, in 100-nanosecond units. This value is applies only to capture filters.
Minbitspersecond
Minimum Data Rate this pin can produce.
Note Deprecated.
Maxbitspersecond
1, first look at the simplest SSE:Only use the SSE-enabled browser (most), the browser built-in EventSource object, the object by default three seconds to refresh the response data.HTML code (taken from W3cschool):DOCTYPE HTML>HTML>Head>Metahttp-equiv= "Content-type"content= "text/html; charset=utf-8" />Head>Body>H1>Get server-side update dataH1>DivID= "Result">Div>Script>if(typeof(EventSource)!=="undefined") {varSource=NewEventSource ("Socket");//parameter for request link Source.onmessage=fun
I. Environment
Refer to the previous article: WEBRTC Learning Three: recording and playback
Two. Implement
The network communication protocol is not explicitly specified in the Voiceengine, so voice chat is not possible only by calling the Voiceengine API. Voenetwork provides method registerexternaltransp
In the previous article (WEBRTC Audio-related Neteq (ii): Data structure) Neteq the main data structures, to understand the mechanism of Neteq lay a good foundation. This article is mainly about how the RTP packets received from the network in the MCU are put into packet buffer and taken out from packet buffer, as well as the calculation of the network delay value (optbuflevel) and the jitter buffer delay value (bufflevelfilt). Let's see how RTP voice
The previous version is estimated to be a bit problematic. I haven't had time to read the new version. I saw someone releasing the new version of b4a. I will repost it and thank you for the original author.
Usage:
1. First install the original
Current results: Speaker read local data, Mic recorded real-time data, can be 90% to eliminate the echo, Aecdelay also need to tune, NS and VAD are normally available. First ensure the AEC normal, next speaker real-time network data, from double
1. The main interface provided externallyVideocodingmoduleimpl::incomingpacket, packet processing interface, called Videocodingmoduleimpl after the RTP parsing process::D ecode, processing the decoded interface Vcmreceivecallba After the completion
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