CN103167359B

CN103167359B - The transmission method of RTP Media Stream and device

Info

Publication number: CN103167359B
Application number: CN201310101268.XA
Authority: CN
Inventors: 郑波
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2013-03-27
Filing date: 2013-03-27
Publication date: 2016-03-02
Anticipated expiration: 2033-03-27
Also published as: WO2014153944A1; CN103167359A

Abstract

The embodiment of the invention discloses a kind of transmission method and device of RTP Media Stream, the method comprises: transmitting apparatus sends a RTP Media Stream to receiving equipment; Described transmitting apparatus receives the sequence number relevant information that described receiving equipment sends; Described transmitting apparatus determines the packet loss information of a RTP Media Stream according to the serial number information of packet in a RTP Media Stream of described sequence number relevant information, actual transmission in feedback cycle; Described transmitting apparatus is according to described packet loss information determination media encoding parameters and transformation parameter; Described transmitting apparatus sends the 2nd RTP Media Stream according to described media encoding parameters and transformation parameter.The embodiment of the present invention effectively can alleviate the packet loss problem occurred when to transmit RTP Media Stream between transmitting apparatus and receiving equipment, improves the efficiency of transmission of RTP Media Stream.

Description

The transmission method of RTP Media Stream and device

Technical field

The present invention relates to the communications field, particularly relate to transmission method and the device of RTP Media Stream.

Background technology

RTP (Real-timeTransportProtocol is called for short RTP) is a kind of procotol realizing media stream data real-time Transmission on Internet protocol (InternetProtocol is called for short IP).Real-time Transport Protocol comprises RTP data protocol and RTP Control Protocol (Real-timeTransportControlProtocol is called for short RTCP).

In prior art, when adopting Real-time Transport Protocol to carry out the transmission of RTP Media Stream, the transmitting procedure of RTP Media Stream between transmitting apparatus and receiving equipment comprises: transmitting apparatus sends RTP Media Stream to receiving equipment; In the RTP Media Stream received in receiving equipment statistics predetermined period, the quantity of packet, sends RTCP feedback message to transmitting apparatus, carries the quantity of described packet in described RTCP feedback message; Described transmitting apparatus adjusts described transformation parameter according to the quantity of the described packet carried in the quantity of packet in the RTP Media Stream sent in described predetermined period and described RTCP feedback message, such as nuisance parameter, redundancy packet form etc.; Transmitting apparatus sends RTP Media Stream according to the transformation parameter after adjustment to receiving equipment.

But the transmission method of above-mentioned RTP Media Stream effectively cannot solve the packet loss problem occurred when to transmit RTP Media Stream between transmitting apparatus and receiving equipment, and the efficiency of transmission of RTP Media Stream is low.

Summary of the invention

Provide a kind of transmission method and device of RTP Media Stream in the embodiment of the present invention, effectively can alleviate the packet loss problem occurred when to transmit RTP Media Stream between transmitting apparatus and receiving equipment, improve the efficiency of transmission of RTP Media Stream.

First aspect, the embodiment of the present invention provides a kind of transmission method of realtime transmission protocol RTP Media Stream, comprising:

Transmitting apparatus sends a RTP Media Stream to receiving equipment;

Receive the sequence number relevant information that described receiving equipment sends, described sequence number relevant information is the serial number information of packet in the described RTP Media Stream that receives in a feedback cycle of described receiving equipment;

According to described sequence number relevant information, in described feedback cycle, in the actual described RTP Media Stream sent, the serial number information of packet determines the packet loss information of a RTP Media Stream;

Determine media encoding parameters and the transformation parameter of the 2nd RTP Media Stream to be sent according to described packet loss information, and send described 2nd RTP Media Stream to described receiving equipment.

In conjunction with above-mentioned first aspect, in the first possible implementation of first aspect, described according to described sequence number relevant information, in described feedback cycle, in the actual described RTP Media Stream sent, the serial number information of packet determines the packet loss information of a RTP Media Stream, comprising:

According to described sequence number relevant information and in described feedback cycle the accepting state sequence of the serial number information determination packet of the actual packet sent, the accepting state sequence of described packet is the sequence of each packet whether packet loss according to the sending order record of packet;

Described transmitting apparatus according to the randomness of the position judgment packet packet loss of the packet of packet loss in described accepting state sequence whether with random loss characteristics match;

If with random loss characteristics match, determine that the packet loss information of RTP Media Stream is random loss;

If do not mated with random loss characteristic, determine that the packet loss information of RTP Media Stream is Bandwidth-Constrained.

In conjunction with above-mentioned first aspect, and/or the first possible implementation of first aspect, in the implementation that first aspect the second is possible, described media encoding parameters and the transformation parameter determining the 2nd RTP Media Stream to be sent according to described packet loss information, comprising:

The network constraint parameter corresponding according to the accepting state sequence determination packet loss information of the packet loss information determined and described packet;

Media encoding parameters and the transformation parameter of the 2nd RTP Media Stream to be sent is determined according to described packet loss information and described network constraint parameter;

When packet loss information is Bandwidth-Constrained, described network constraint parameter comprises: restrictive cycle, and described restrictive cycle is total transmission duration of the continuous packet of non-packet loss and the packet of continual data package dropout in the accepting state sequence of described packet; Maximum stream flow, described maximum stream flow is the total bytes of the packet of continuous non-packet loss in described sequence number relevant information;

When packet loss information is random loss, described network constraint parameter comprises: packet loss, and described packet loss is the sum of packet sum divided by packet in the accepting state sequence of described packet of packet loss in the accepting state sequence of described packet.

In conjunction with the implementation that above-mentioned first aspect the second is possible, in the third possible implementation of first aspect, described media encoding parameters and the transformation parameter determining the 2nd RTP Media Stream to be sent according to described packet loss information and described network constraint parameter, comprising:

Described media encoding parameters and transformation parameter is determined according to following formula:

maxf(x,y)=g(x)+h(y)；

s.t.a(x,y)≤P

Wherein, x presentation medium coding parameter, y represents transformation parameter; G (x) presentation medium coding parameter is obtainable media quality mark under lossless network; H (y) expression is proofreaded the impact of described media quality mark based on described transformation parameter; F(x, y) represent the media quality mark that described media encoding parameters and transformation parameter obtain under real network; A (x, y) presentation medium coding parameter and network constraint parameter corresponding to transformation parameter, P represents the network constraint parameter that described packet loss information is corresponding.

Second aspect, the embodiment of the present invention provides a kind of transmission method of realtime transmission protocol RTP Media Stream, comprising:

Receiving equipment receives the RTP Media Stream that transmitting apparatus sends;

Determine the sequence number relevant information of a RTP Media Stream, described sequence number relevant information is the serial number information of packet in the RTP Media Stream that receives in a feedback cycle of described receiving equipment;

Send described sequence number relevant information to described transmitting apparatus, so as described transmitting apparatus according to described sequence number relevant information and in described feedback cycle in the actual RTP Media Stream sent the serial number information of packet determine the packet loss information of a RTP Media Stream, the media encoding parameters determining the 2nd RTP Media Stream that described transmitting apparatus is to be sent according to described packet loss information and transformation parameter;

Receive the 2nd RTP Media Stream that described transmitting apparatus sends according to described media encoding parameters and transformation parameter.

In conjunction with above-mentioned second aspect, in the first possible implementation of second aspect, described sequence number relevant information is realized by bag assortment bitmap, describedly determines that the sequence number relevant information of a RTP Media Stream comprises:

Determine the serial number information of packet in the RTP Media Stream received in a feedback cycle;

Described bag arrangement bitmap is generated according to described serial number information.

The third aspect, the embodiment of the present invention provides a kind of transmitting device of realtime transmission protocol RTP Media Stream, comprising:

First transmitting element, for sending a RTP Media Stream to receiving equipment;

First receiving element, for receiving the sequence number relevant information that described receiving equipment sends, described sequence number relevant information is the serial number information of packet in the RTP Media Stream that receives in a feedback cycle of described receiving equipment;

Packet loss information determination unit, for receive according to described first receiving element described sequence number relevant information, the actual transmission of described first transmitting element in described feedback cycle a RTP Media Stream in the serial number information of packet determine the packet loss information of a RTP Media Stream;

Parameter determination unit, for determining media encoding parameters and the transformation parameter of the 2nd RTP Media Stream to be sent according to described packet loss information;

Described first transmitting element also for: send described 2nd RTP Media Stream.

In conjunction with the above-mentioned third aspect, in the first possible implementation of the third aspect, packet loss information determination unit comprises:

Sequence determination subelement, for according to described sequence number relevant information and in described feedback cycle the accepting state sequence of the serial number information determination packet of the actual packet sent, the accepting state sequence of described packet is the sequence of each packet whether packet loss according to the sending order record of packet;

Reason determination subelement, for the position judgment packet packet loss in the accepting state sequence of described packet determined at described sequence determination subelement according to the packet of packet loss randomness whether with random loss characteristics match, if with random loss characteristics match, then determine that the packet loss information of Media Stream is random loss; Otherwise, determine that the packet loss information of Media Stream is Bandwidth-Constrained.

In conjunction with the above-mentioned third aspect, and/or the first possible implementation of the third aspect, in the implementation that third aspect the second is possible, described parameter determination unit comprises:

First parameter determination subelement, for the network constraint parameter corresponding according to the accepting state sequence determination packet loss information of the packet loss information determined and described packet;

Second parameter determination subelement, the described network constraint parameter for determining according to described packet loss information and described first parameter determination subelement determines media encoding parameters and the transformation parameter of the 2nd RTP Media Stream to be sent;

In conjunction with the implementation that above-mentioned third aspect the second is possible, in the third possible implementation of the third aspect, the second parameter determination subelement specifically for:

maxf(x,y)=g(x)+h(y)；

s.t.a(x,y)≤P

Fourth aspect, the embodiment of the present invention provides a kind of transmitting device of realtime transmission protocol RTP Media Stream, comprising:

Second receiving element, for receiving the RTP Media Stream that transmitting apparatus sends;

Information determination unit, for determining the sequence number relevant information of a RTP Media Stream that described second receiving element receives, described sequence number relevant information is the serial number information of packet in the RTP Media Stream that receives in a feedback cycle of described second receiving element;

Second transmitting element, for sending the described sequence number relevant information that described information determination unit is determined to described transmitting apparatus, so as described transmitting apparatus according to described sequence number relevant information and in described feedback cycle in the actual RTP Media Stream sent the serial number information of packet determine the packet loss information of a RTP Media Stream, the media encoding parameters determining the 2nd RTP Media Stream that described transmitting apparatus is to be sent according to described packet loss information and transformation parameter;

Described second receiving element also for: receive the 2nd RTP Media Stream that described transmitting apparatus sends according to described media encoding parameters and transformation parameter.

In conjunction with above-mentioned fourth aspect, in the first possible implementation of fourth aspect, described sequence number relevant information by bag assortment bitmap realize, described information determination unit specifically for:

5th aspect, the embodiment of the present invention provides a kind of transmission system of realtime transmission protocol RTP Media Stream, comprises transmitting apparatus and receiving equipment, wherein,

Described transmitting apparatus, for sending a RTP Media Stream to receiving equipment, receive the sequence number relevant information that described receiving equipment sends, described sequence number relevant information is the serial number information of packet in the described RTP Media Stream that receives in a feedback cycle of described receiving equipment, according to described sequence number relevant information, in described feedback cycle, in the actual described RTP Media Stream sent, the serial number information of packet determines the packet loss information of a RTP Media Stream, media encoding parameters and the transformation parameter of the 2nd RTP Media Stream to be sent is determined according to described packet loss information, and send described 2nd RTP Media Stream to described receiving equipment,

Described receiving equipment, for receiving the RTP Media Stream that transmitting apparatus sends, determine the sequence number relevant information of a RTP Media Stream, described sequence number relevant information is the serial number information of packet in the RTP Media Stream that receives in a feedback cycle of described receiving equipment, described sequence number relevant information is sent to described transmitting apparatus, so that described transmitting apparatus according to described sequence number relevant information and in described feedback cycle in the actual RTP Media Stream sent the serial number information of packet determine the packet loss information of a RTP Media Stream, media encoding parameters and the transformation parameter of the 2nd RTP Media Stream that described transmitting apparatus is to be sent is determined according to described packet loss information, receive the 2nd RTP Media Stream that described transmitting apparatus sends according to described media encoding parameters and transformation parameter.

In conjunction with above-mentioned 5th aspect, in the 5th in the first possible implementation, described transmitting apparatus is described according to described sequence number relevant information, in described feedback cycle, in the actual described RTP Media Stream sent, the serial number information of packet determines the packet loss information of a RTP Media Stream specifically for realizing in the following manner:

In conjunction with above-mentioned 5th aspect, and/or the 5th the first possible implementation of aspect, in the implementation that the second is possible in the 5th, described transmitting apparatus is specifically for realizing described media encoding parameters and the transformation parameter of determining the 2nd RTP Media Stream to be sent according to described packet loss information in the following manner:

In the embodiment of the present invention, transmitting apparatus sends a RTP Media Stream to receiving equipment; Receive the sequence number relevant information that described receiving equipment sends, described sequence number relevant information is the serial number information of packet in the described RTP Media Stream that receives in a feedback cycle of described receiving equipment; According to described sequence number relevant information, in described feedback cycle, in the actual described RTP Media Stream sent, the serial number information of packet determines the packet loss information of a RTP Media Stream; Determine media encoding parameters and the transformation parameter of the 2nd RTP Media Stream to be sent according to described packet loss information, and send described 2nd RTP Media Stream to described receiving equipment.Thus the packet loss information of a RTP Media Stream determined by transmitting apparatus, according to packet loss information determination media encoding parameters and transformation parameter; Described transmitting apparatus sends the 2nd RTP Media Stream according to described media encoding parameters and transformation parameter, therefore the embodiment of the present invention effectively can alleviate the packet loss problem between transmitting apparatus and receiving equipment in RTP media flow transmission process, improves the efficiency of transmission of RTP Media Stream.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

Fig. 1 is the transmission method first embodiment schematic diagram of RTP Media Stream of the present invention;

Fig. 2 is the transmission method second embodiment schematic diagram of RTP Media Stream of the present invention;

Fig. 3 is transmission method the 3rd embodiment schematic diagram of RTP Media Stream of the present invention;

Fig. 4 is the transmitting device first embodiment schematic diagram of RTP Media Stream of the present invention;

Fig. 5 is the transmitting device second embodiment schematic diagram of RTP Media Stream of the present invention;

Fig. 6 is the transmitting apparatus structural representation of RTP Media Stream of the present invention;

Fig. 7 is the receiving equipment structural representation of RTP Media Stream of the present invention;

Fig. 8 is the transmission system structural representation of RTP Media Stream of the present invention.

Embodiment

Finding by analyzing, causing the reason of packet packet loss to be not quite similar in the transmitting procedure of RTP Media Stream, different packet loss reasons needs to adopt different measures to go to overcome.If accurately do not screen packet loss reason, the adjustment of transmitting apparatus to transformation parameter is probably run counter to desire.If the such as Bandwidth-Constrained of media stream between transmitting apparatus and transmission equipment, available bandwidth is less than RTP Media Stream actual uplink bandwidth when causing packet packet loss, if adopt redundancy encoding as forward error correction coding (FEC, ForwardErrorCorrection) after, the actual uplink bandwidth of RTP Media Stream can be strengthened, the transmission of RTP Media Stream is caused to need more bandwidth resources, thus aggravation packet packet loss; Or, when packet loss reason is random loss, if reduce the flow of the RTP Media Stream of transmitting apparatus, can not ensure that the RTP Media Stream that transmitting apparatus sends more effectively can transfer to receiving equipment.Visible, screening the packet loss reason of packet, is the core solving the packet loss problem occurred in RTP media flow transmission process between transmitting apparatus and receiving equipment, the efficiency of transmission improving RTP Media Stream.But, in prior art, RTP media stream transmission method only adjusts transformation parameter, obviously effectively can only could solve the packet loss problem between transmitting apparatus and receiving equipment in RTP media flow transmission process in some specific situation or occasion luckily, in most of the cases all effectively cannot solve the packet loss problem between transmitting apparatus and receiving equipment in RTP media flow transmission process.

In view of this, in the RTP media stream transmission method that the embodiment of the present invention provides, determine the packet loss information of RTP Media Stream, according to described packet loss information determination media encoding parameters and transformation parameter, thus effectively alleviate the packet loss problem occurred in RTP media flow transmission process between transmitting apparatus and receiving equipment, improve the efficiency of transmission of RTP Media Stream.

Wherein, the embodiment of the present invention be referred to as transmitting apparatus and refer to the equipment sending RTP Media Stream, receiving equipment refers to the equipment receiving RTP Media Stream, and in order to limit, whether described transmitting apparatus can not send and receive other data outside RTP Media Stream, whether described receiving equipment can send and receive other data outside RTP Media Stream.

Below in conjunction with the accompanying drawing in the embodiment of the present invention, carry out clear, complete description to the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not paying the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

See Fig. 1, be the transmission method first embodiment schematic diagram of RTP Media Stream of the present invention, the method can be applied to transmitting apparatus, and the method comprises:

Step 101: transmitting apparatus sends a RTP Media Stream to receiving equipment;

Step 102: described transmitting apparatus receives the sequence number relevant information that described receiving equipment sends, described sequence number relevant information is the serial number information of packet in the RTP Media Stream that receives in a feedback cycle of described receiving equipment;

Wherein, described receiving equipment can send described sequence number relevant information by message such as RTCP feedback messages to described transmitting apparatus.

Wherein, described sequence number relevant information can comprise: the serial number information of packet in the RTP Media Stream that receiving equipment receives in a feedback cycle, or, bag arrangement bitmap; In the RTP Media Stream that described bag arrangement bitmap can be received in a feedback cycle by receiving equipment, the serial number information of packet generates.

Step 103: described transmitting apparatus determines the packet loss information of a RTP Media Stream according to the serial number information of packet in the RTP Media Stream of described sequence number relevant information, actual transmission in described feedback cycle;

Described packet loss information is the information for recording RTP Media Stream packet loss reason.

Step 104: described transmitting apparatus determines media encoding parameters and the transformation parameter of the 2nd RTP Media Stream to be sent according to described packet loss information, and send described 2nd RTP Media Stream to described receiving equipment.

Wherein, a described RTP Media Stream and the 2nd RTP Media Stream are RTP Media Stream, described first, second only for distinguishing the RTP Media Stream in step 101 and step 104.

A described RTP Media Stream and the 2nd RTP Media Stream can be identical or different RTP Media Stream.General, a described RTP Media Stream is different with the 2nd RTP Media Stream, and the 2nd RTP Media Stream Media Stream that to be a RTP Media Stream follow-up, thus by determining media encoding parameters and transformation parameter according to the transmission of a preceding RTP Media Stream, re-use the transmission that the described code media streams parameter determined and transformation parameter carry out follow-up RTP Media Stream.

In the present embodiment, the packet loss information of a RTP Media Stream determined by transmitting apparatus, according to described packet loss information determination media encoding parameters and transformation parameter; Described transmitting apparatus sends the 2nd RTP Media Stream according to described media encoding parameters and transformation parameter, therefore the embodiment of the present invention can determine different media encoding parameters and transformation parameter for different packet loss reasons, thus effectively can alleviate the packet loss problem of RTP Media Stream between transmitting apparatus and receiving equipment, improve the efficiency of transmission of RTP Media Stream.

See Fig. 2, be the transmission method second embodiment schematic diagram of RTP Media Stream of the present invention, the method can be applied to receiving equipment, and the method comprises:

Step 201: receiving equipment receives the RTP Media Stream that transmitting apparatus sends;

Step 202: the sequence number relevant information of a RTP Media Stream determined by receiving equipment, described sequence number relevant information is the serial number information of packet in the RTP Media Stream that receives in a feedback cycle of described receiving equipment;

Wherein, when sequence number relevant information comprises the serial number information of packet in the RTP Media Stream that receiving equipment receives in a feedback cycle, the sequence number of each packet can in sequence number relevant information, directly be comprised;

Or when described sequence number relevant information comprises arrangement bitmap, receiving equipment determines that the sequence number relevant information of RTP Media Stream can comprise: the serial number information of packet in the RTP Media Stream received in a feedback cycle determined by receiving equipment; Receiving equipment generates bag arrangement bitmap according to described serial number information.

Step 203: receiving equipment is to sequence number relevant information described in described transmitting apparatus, so that described transmitting apparatus determines the packet loss information of a RTP Media Stream, the media encoding parameters determining the 2nd RTP Media Stream that described transmitting apparatus is to be sent according to described packet loss information and transformation parameter according to the serial number information of packet in a RTP Media Stream of described sequence number relevant information, actual transmission in described feedback cycle;

Step 204: described receiving equipment receives the 2nd RTP Media Stream that described transmitting apparatus sends according to described media encoding parameters and transformation parameter.

In the present embodiment, receiving equipment is according to the serial number information determination sequence number relevant information of packet in the RTP Media Stream received in a feedback cycle, described sequence number relevant information is sent to described transmitting apparatus, so that described transmitting apparatus is according to described sequence number relevant information, in described feedback cycle, in the actual RTP Media Stream sent, the serial number information of packet determines the packet loss information of a RTP Media Stream, and then determine media encoding parameters and transformation parameter, transmitting apparatus can carry out the transmission of the 2nd RTP Media Stream according to the described media encoding parameters determined and transformation parameter afterwards, therefore the embodiment of the present invention effectively can alleviate the packet loss problem of Media Stream between transmitting apparatus and receiving equipment, improve the efficiency of transmission of RTP Media Stream.

See Fig. 3, be RTP media stream transmission method the 3rd embodiment schematic diagram of the present invention, the method comprises:

Step 301: transmitting apparatus sends a RTP Media Stream to receiving equipment.

Wherein, described transmitting apparatus carries out the transmission of a RTP Media Stream with current media encoding parameters and transformation parameter.

Step 302: receiving equipment receives a described RTP Media Stream, determines the sequence number relevant information of a RTP Media Stream;

Wherein, when sequence number relevant information comprises the serial number information of packet in the RTP Media Stream that receiving equipment receives in a feedback cycle, the sequence number of each packet can in sequence number relevant information, directly be recorded; Such as, if receiving equipment have received 5 packets that sequence number is 1,3,4,5,7 in a described feedback cycle, then described sequence number relevant information can be: 13457;

Or when described sequence number relevant information comprises arrangement bitmap, receiving equipment determines that the sequence number relevant information of a RTP Media Stream can comprise: the serial number information of packet in the RTP Media Stream received in a feedback cycle determined by receiving equipment; Receiving equipment generates bag arrangement bitmap according to described serial number information.

In a kind of possible implementation, described bag arrangement bitmap can comprise: the sequence number of first packet received in a described feedback cycle and according to receiving the bitmap that other packets generate except first packet in a described feedback cycle.Such as, if receiving equipment have received 7 packets that sequence number is 1,2,3,5,6,7,8 in described feedback cycle one by one, then described bag arrangement bitmap can be:

HeaderPacketSN:1

RcvMap:0xF7

Wherein, the binary representation of 0xF7 is 11110111, if lowest bit position represents first packet, bit is that 1 expression successfully receives, and so 0xF7 just can express receiving equipment and have received 7 packets that sequence number is 1,2,3,5,6,7,8.

Wherein, the concrete time span of described feedback cycle and initial time can independently set in actual applications, do not limit here.

Step 303: receiving equipment sends RTCP feedback message to described transmitting apparatus, and described RTCP feedback message comprises described sequence number relevant information.

In actual applications, receiving equipment also can carry described sequence number relevant information by other message, does not limit here.

Wherein, described RTCP feedback message can be sent to transmitting apparatus according to described feedback cycle timing in the process receiving RTP Media Stream by receiving equipment.Such as, at the end of each feedback cycle, obtain described sequence number relevant information by receiving equipment according to the serial number information of packet in the RTP Media Stream received in the feedback cycle just terminated, send the RTCP feedback message comprising described sequence number relevant information to described transmitting apparatus.

Wherein, in described RTCP feedback message, other information can also be comprised, such as: the total amount of byte of the RTP Media Stream that receiving equipment receives in described feedback cycle, and/or Delay.

Wherein, described total amount of byte may be used for calculating the bandwidth constraint between transmitting apparatus and receiving equipment, and concrete, described bandwidth constraint equals: the time span of described total amount of byte/described feedback cycle.

And described Delay can when transmitting apparatus adjusts the transmission path of RTP Media Stream between transmitting apparatus and receiving equipment as described transmission path adjust according to one of.Specific implementation process does not repeat here.

Step 304: transmitting apparatus receives described RTCP feedback message, according to described sequence number relevant information, in a described feedback cycle, in the actual RTP Media Stream sent, the serial number information of packet determines the packet loss information of a described RTP Media Stream.

In embodiments of the present invention, packet loss information is divided into random loss and Bandwidth-Constrained two kinds.In actual applications, also can carry out other according to actual conditions to packet loss information and divide, not limit here.

The described network constraint parameter difference that different packet loss information is corresponding, when packet loss information is random loss, described network constraint parameter can comprise: the packet loss of packet random loss and packet loss cycle; When packet loss information is Bandwidth-Constrained, described network constraint parameter can comprise: the maximum stream flow between transmitting apparatus and receiving equipment and restrictive cycle.

Concrete, described according to described sequence number relevant information, in a described feedback cycle, in the actual RTP Media Stream sent, the serial number information of packet determines that the packet loss information of a described RTP Media Stream can comprise:

Described transmitting apparatus according to described sequence number relevant information and in described feedback cycle the accepting state sequence of the serial number information determination packet of packet in the actual RTP Media Stream sent, the accepting state sequence of described packet is the information of each packet whether packet loss according to the sending order record of packet;

According to the randomness of the position judgment packet packet loss of packet in the accepting state sequence of described packet of packet loss whether with random loss characteristics match, if with random loss characteristics match, then determine that the packet loss information of Media Stream is random loss; Otherwise, determine that the packet loss information of Media Stream is Bandwidth-Constrained.

Such as, in a described feedback cycle, transmitting apparatus have sent to receiving equipment 10 packets that sequence number is 1 ~ 10; And sequence number relevant information is 1236789; Then, the accepting state sequence of packet can be: rrrxxrrrrx, and wherein, r represents the non-packet loss of this packet, and x represents this packet packet loss.

According to the randomness of the position judgment packet packet loss in the accepting state sequence of the packet of packet loss at described packet whether with random loss characteristics match time, can in conjunction with realizations such as Poisson distribution (Poissondistribution), self similarity models.Such as, Poisson distribution is a kind of statistics and discrete probability distribution common in Probability, and Poisson distribution is suitable for describing the number of times that in the unit interval, chance event occurs.Poisson distribution formula is as follows wherein the expectation and variance of Poisson distribution is λ, and λ is the average originating rate of chance event in unit interval or unit are, and k is the number of times that in the unit time, chance event occurs, k=0, and 1,2 ...Because the number of times that random loss event occurs within the unit interval or the obedience Poisson distribution that number is similar to, so the value of λ can be gone out according to above-mentioned Poisson distribution formulae discovery according to the position of the packet of packet loss in the accepting state sequence of described packet, and then calculate the theoretical number of dropped packets within the Δ t time corresponding to described λ according to λ value; The accepting state sequence of getting the Δ t time is appointed from the accepting state sequence of described packet, judge whether the difference of actual number of dropped packets and described theoretical number of dropped packets in the accepting state sequence of described Δ t time is not more than default difference threshold, if, then judge randomness and the random loss characteristics match of packet packet loss, if not, then judge that the randomness of packet packet loss is not mated with random loss characteristic.Wherein, described difference threshold can independently be arranged in actual applications.

Therefore, in a kind of possible implementation, whether the randomness of the position judgment packet packet loss of the described packet according to packet loss in the accepting state sequence of described packet meets random loss characteristic can comprise:

According to position in the accepting state sequence of described packet of the packet of packet loss according to Poisson distribution formula calculate λ value; K is the position of packet in accepting state sequence of packet loss;

Calculate the theoretical number of dropped packets within the Δ t time that λ is corresponding;

The accepting state sequence of getting the Δ t time is appointed from the accepting state sequence of described packet, judge whether the difference of actual number of dropped packets and described theoretical number of dropped packets in the accepting state sequence of described Δ t time is less than predetermined threshold value, if be less than, then judge randomness and the random loss characteristics match of packet packet loss, otherwise, judge that the randomness of packet packet loss is not mated with random loss characteristic.

Wherein, can according to formula P during the theoretical number of dropped packets within the Δ t time that calculating λ is corresponding ₁(t, t+ Δ t)=λ Δ t+ Ο (Δ t) calculates, and wherein, t is initial time, P1(t+ Δ t) represent the probability of packet packet loss within the t+ Δ t time; O(Δ t) be the function formula of Δ t; Specifically how to realize described calculating, do not repeat here.

Step 305: the network constraint parameter that transmitting apparatus is corresponding according to the accepting state sequence determination packet loss information of the packet loss information determined and described packet.

Wherein, when packet loss information is Bandwidth-Constrained, the network constraint parameter corresponding according to the accepting state sequence determination packet loss information of the packet loss information determined and described packet can comprise: by total transmission duration of the packet of non-packet loss continuous in the accepting state sequence of described packet and the packet of continual data package dropout, as described restrictive cycle; Using the total bytes of the packet of non-packet loss continuous in described sequence number relevant information as described maximum stream flow;

When packet loss information is random loss, the network constraint parameter corresponding according to the accepting state sequence determination packet loss information of the packet loss information determined and described packet can comprise: by the packet of packet loss in the accepting state sequence of described packet sum divided by the sum of packet in the accepting state sequence of described packet, obtain described packet loss.

Wherein, the packet loss cycle generally can calculate in conjunction with packet loss, and circular does not limit here.In actual applications, because packet loss is introduced by routing/exchanging equipment performance bottleneck, and in routing/exchanging equipment performance, adopt bag (PPS, PacketPerSecond) per second as common counter, therefore the packet loss cycle directly can be set to 1s.Therefore, in actual applications, directly can prestoring the numerical value in packet loss cycle in transmitting apparatus, when determining network constraint parameter corresponding to random loss, reading the numerical value in the packet loss cycle that this prestores.

Concrete, when determining restrictive cycle, the packet of first packet loss first can be found from the accepting state sequence of described packet, then, from the packet finding first non-packet loss after the packet of described first packet loss, determine the number of the packet of continuous non-packet loss from the packet of this non-packet loss, and the packet of first packet loss after determining the packet of this non-packet loss, determine the number of the packet of continual data package dropout from the packet of this packet loss, calculate the summation of the described number of packet of non-packet loss and the number of the packet of continual data package dropout continuously, described summation is multiplied with the transmission duration of each packet, obtain described restrictive cycle.

When determining described maximum stream flow, the total bytes of the packet of continuous non-packet loss from the packet of this non-packet loss can be determined, obtain described maximum stream flow.

Such as, the accepting state sequence of described packet is rrxxrrrxxrrrxx, then, first the 3rd packet being designated x can be found out, then, the packet that first is designated r is found after the 3rd packet, i.e. the 5th packet, the packet unwrapping the non-packet loss that begins continuously from the 5th data is that the 5th packet is to the 7th packet, therefore, determine that the number unwrapping the packet of non-packet loss that begins continuously from the 5th data is 3, after 5th packet, first packet being designated x is the 8th packet, the packet unwrapping beginning continual data package dropout from the 8th data is the 8th packet and the 9th packet, therefore, determine that the number unwrapping the packet of beginning continual data package dropout from the 8th data is 2, total number is 5, then described restrictive cycle is 5t, t is the transmission duration of each packet.

Described maximum stream flow is the total bytes of the 5th packet to the 7th packet.

Step 306: transmitting apparatus determines media encoding parameters and the transformation parameter of the 2nd RTP Media Stream to be sent according to described packet loss information and network constraint parameter corresponding to described packet loss information.

Wherein, described media encoding parameters can comprise at least one parameter in following parameter: build RTP bag rate, media coding algorithm, code rate after media coding.

Wherein, the quantity that RTP bag rate refers to the packet of transmitting apparatus transmission per second is built after described media coding;

Described media coding algorithm refers to the media compression algorithmic format that transmitting apparatus adopts when encoding to RTP Media Stream, and described media compression algorithmic format comprises: adaptive multi-rate (AMR, AdaptiveMulti-Rate), G.711 etc.;

Described code rate refers to the speed adopting described media compression algorithm, such as, multiple speed (rate) form is comprised, the rate format that this media compression algorithm of AMR specifically can be indicated to use by described code rate under this media compression algorithm of AMR.

Described transformation parameter can comprise at least one parameter in following parameter: redundancy packet coded format, nuisance parameter.

Wherein, described nuisance parameter refers to redundancy coefficient, and such as, when described nuisance parameter is 1 times of redundancy, then transmitting apparatus can when carrying out the transmission of RTP Media Stream, by the multiple portion of packet each in RTP Media Stream;

Described nuisance parameter can be non-integer when practical application, as 10% represents that this can realize by technology such as important frame identifications, repeats no more only to 10% execution, the one times of redundancy in all packets here.

The coded format that the packet that described redundancy packet coded format is used to indicate redundancy adopts.As the redundant format etc. of RFC2198 definition.

In actual applications, can by test, test different media parameter and the performance of transformation parameter under heterogeneous networks damage, the equation be made up of network constraint parameter corresponding to packet loss information, media encoding parameters, transformation parameter is determined according to the method for constrained optimization such as mathematical regression method, as:

maxf(x,y)=g(x)+h(y)

s.t.a(x,y)≤P

Wherein, x presentation medium coding parameter, y represents transformation parameter; G (x) presentation medium coding parameter is obtainable media quality mark under lossless network, Mean Opinion Score (the MOS of voice quality is such as described, MeanOpinionScore)/subjective speech quality assessment (PESQ, Perceptualevaluationofspeechquality) point; H (y) expression is proofreaded the impact of described media quality mark based on described transformation parameter; F(x, y) represent the media quality mark that described media encoding parameters and transformation parameter obtain under real network; A (x, y) presentation medium coding parameter and network constraint parameter corresponding to transformation parameter, P represents the network constraint parameter that described packet loss information is corresponding.

Concrete, need in the embodiment of the present invention to form the first equation according to network constraint parameter corresponding to random loss, media encoding parameters, transformation parameter, form the second equation according to network constraint parameter corresponding to bandwidth constraint, media encoding parameters, transformation parameter; In the realization of this step, directly network constraint parameter corresponding for packet loss information can be substituted in equation corresponding to packet loss information, calculate media encoding parameters and transformation parameter.

Step 307: transmitting apparatus sends the 2nd RTP Media Stream according to the media encoding parameters determined in step 306 and transformation parameter.

Wherein, in this step, transmitting apparatus sends the media encoding parameters of the 2nd RTP Media Stream institute foundation and transformation parameter is determine according to packet loss information and network constraint parameter corresponding to described packet loss information, thus effectively can alleviate the packet loss problem occurred in RTP media flow transmission process between transmitting apparatus and receiving equipment, improve the efficiency of transmission of RTP Media Stream.

In the present embodiment, transmitting apparatus determines the packet loss information of a RTP Media Stream and network constraint parameter corresponding to described packet loss information, according to described packet loss information and network constraint parameter determination media encoding parameters corresponding to described packet loss information and transformation parameter; Described transmitting apparatus sends the 2nd RTP Media Stream according to described media encoding parameters and transformation parameter, therefore the embodiment of the present invention effectively can alleviate the packet loss problem occurred in RTP media flow transmission process between transmitting apparatus and receiving equipment, improves the efficiency of transmission of RTP Media Stream.

See Fig. 4, be the transmitting device first embodiment schematic diagram of RTP Media Stream of the present invention, this device can be arranged at transmitting apparatus, and this device 400 comprises:

First transmitting element 410, for sending a RTP Media Stream to receiving equipment;

First receiving element 420, for receiving the sequence number relevant information that described receiving equipment sends, described sequence number relevant information is the serial number information of packet in a RTP Media Stream of described first transmitting element 410 transmission that described receiving equipment receives in a feedback cycle;

Packet loss information determination unit 430, determines the packet loss information of a RTP Media Stream for the serial number information of packet in the described sequence number relevant information received according to described first receiving element 420, described first transmitting element 410 reality sends in described feedback cycle a RTP Media Stream;

Parameter determination unit 440, the described packet loss information for determining according to described packet loss information determination unit 430 determines media encoding parameters and the transformation parameter of the 2nd RTP Media Stream to be sent;

Described first transmitting element 410 also sends the 2nd RTP Media Stream for: the described media encoding parameters determined according to described parameter determination unit 440 and transformation parameter.

Preferably, packet loss information determination unit 430 specifically can comprise:

Sequence determination subelement, for according to described sequence number relevant information and in described feedback cycle the accepting state sequence of the serial number information determination packet of the actual packet sent, the accepting state sequence of described packet is the information of each packet whether packet loss according to the sending order record of packet;

Preferably, described parameter determination unit 440 can comprise:

Described first parameter determination subelement specifically may be used for:

When packet loss information is Bandwidth-Constrained, by total transmission duration of the packet of non-packet loss continuous in the accepting state sequence of described packet and the packet of continual data package dropout, as described restrictive cycle; Using the total bytes of the packet of non-packet loss continuous in described sequence number relevant information as described maximum stream flow;

When packet loss information is random loss, described network constraint parameter can comprise: by the packet of packet loss in the accepting state sequence of described packet sum divided by the sum of packet in the accepting state sequence of described packet, obtain packet loss.

When packet loss information is random loss, by the packet of packet loss in the accepting state sequence of described packet sum divided by the sum of packet in the accepting state sequence of described packet, obtain described packet loss.

Preferably, the second parameter determination subelement specifically may be used for:

Described network constraint parameter is determined according to following formula:

maxf(x,y)=g(x)+h(y)；

s.t.a(x,y)≤P

In the present embodiment, determine the packet loss information of Media Stream, according to described packet loss information determination media encoding parameters and transformation parameter; Send the 2nd RTP Media Stream according to described media encoding parameters and transformation parameter, therefore, it is possible to effectively alleviate the packet loss problem between transmitting apparatus and receiving equipment in RTP media flow transmission process, improve the efficiency of transmission of RTP Media Stream.

See Fig. 5, be the transmitting device second embodiment schematic diagram of RTP Media Stream of the present invention, this device can be arranged at receiving equipment, and this device 500 comprises:

Second receiving element 510, for receiving the RTP Media Stream that transmitting apparatus sends;

Information determination unit 520, for determining the sequence number relevant information of RTP Media Stream that described second receiving element 510 receives, described sequence number relevant information is the serial number information of packet in the RTP Media Stream that receives in a feedback cycle of described second receiving element 510;

Second transmitting element 530, for sending the described sequence number relevant information that described information determination unit 520 is determined to described transmitting apparatus, so that described transmitting apparatus determines the information of the packet loss information of a RTP Media Stream, the media encoding parameters determining the 2nd RTP Media Stream that described transmitting apparatus is to be sent according to described packet loss information and transformation parameter according to the serial number information of packet in a RTP Media Stream of described sequence number relevant information, actual transmission in described feedback cycle;

Second receiving element 510 also for: receive described transmitting apparatus and send the 2nd RTP Media Stream according to described media encoding parameters and transformation parameter.

Preferably, described sequence number relevant information is realized by bag assortment bitmap, and described information determination unit 520 specifically may be used for:

In the present embodiment, according to the RTP Media Stream determination sequence number relevant information received in a feedback cycle, described sequence number relevant information is sent to described transmitting apparatus, so that described transmitting apparatus is according to described sequence number relevant information, the packet loss information of the serial number information determination Media Stream of packet in the RTP Media Stream of actual transmission in described feedback cycle, according to described packet loss information determination media encoding parameters and transformation parameter, receive the 2nd RTP Media Stream that transmitting apparatus sends according to the described media encoding parameters determined and transformation parameter afterwards, therefore, it is possible to effectively alleviate the packet loss problem between transmitting apparatus and receiving equipment in RTP media flow transmission process, improve the efficiency of transmission of RTP Media Stream.

See Fig. 6, be the transmitting apparatus structural representation of RTP Media Stream of the present invention, this transmitting apparatus 600 comprises: first processor 610, first memory 620, first transceiver 630 and the first bus 640;

First processor 610, first memory 620, first transceiver 630 are interconnected by the first bus 640; First bus 640 can be isa bus, pci bus or eisa bus etc.Described first bus 640 can be divided into address bus, data/address bus, control bus etc.For ease of representing, only representing with a thick line in Fig. 6, but not representing the bus only having a bus or a type.

First memory 620, for depositing program, described program is for realizing the RTP media stream transmission method of Fig. 1 and middle transmitting apparatus execution embodiment illustrated in fig. 3.Particularly, program can comprise program code, and described program code comprises computer-managed instruction.First memory 620 may comprise high-speed RAM memory, still may comprise nonvolatile memory (non-volatilememory), such as at least one magnetic disc store.

First transceiver 630, for connecting other equipment, as receiving equipment, server and remote host etc., and communicates with other equipment.Concrete, first transceiver 630 for: send a RTP Media Stream to receiving equipment; Receive the sequence number relevant information that described receiving equipment sends, described sequence number relevant information is the serial number information of packet in the RTP Media Stream that receives in a feedback cycle of described receiving equipment; The media encoding parameters determined according to first processor 610 and transformation parameter send the 2nd RTP Media Stream.

First processor 610 performs the described program code stored in first memory 620, for the described sequence number relevant information, described first transceiver 630 information of the packet loss information of the serial number information determination Media Stream of packet in the actual RTP Media Stream sent in described feedback cycle that receive according to described first transceiver 630; Media encoding parameters and the transformation parameter of the 2nd RTP Media Stream to be sent is determined according to described packet loss information.

Preferably, described first processor 610 specifically may be used for: according to described sequence number relevant information and in described feedback cycle the accepting state sequence of the serial number information determination packet of the actual packet sent, the accepting state sequence of described packet is the information of each packet whether packet loss according to the sending order record of packet; According to the randomness of the position judgment packet packet loss of packet in the accepting state sequence of described packet of packet loss whether with random loss characteristics match, if with random loss characteristics match, then determine that the packet loss information of Media Stream is random loss; Otherwise, determine that the packet loss information of Media Stream is Bandwidth-Constrained.

Preferably, described first processor 610 specifically may be used for: the network constraint parameter corresponding according to the accepting state sequence determination packet loss information of the packet loss information determined and described packet;

Media encoding parameters and the transformation parameter of the 2nd RTP Media Stream to be sent is determined according to described packet loss information and described network constraint parameter.

Wherein, when packet loss information is Bandwidth-Constrained, described network constraint parameter can comprise: restrictive cycle, and described restrictive cycle is total transmission duration of the continuous packet of non-packet loss and the packet of continual data package dropout in the accepting state sequence of described packet; Maximum stream flow, described maximum stream flow is the total bytes of the packet of continuous non-packet loss in described sequence number relevant information;

Preferably, described first processor 610 specifically may be used for: when packet loss information is Bandwidth-Constrained, by total transmission duration of the packet of non-packet loss continuous in the accepting state sequence of described packet and the packet of continual data package dropout, as described restrictive cycle; Using the total bytes of the packet of non-packet loss continuous in described sequence number relevant information as described maximum stream flow; When packet loss information is random loss, by the packet of packet loss in the accepting state sequence of described packet sum divided by the sum of packet in the accepting state sequence of described packet, obtain described packet loss.

Preferably, described first processor 610 specifically may be used for determining described network constraint parameter according to following formula:

maxf(x,y)=g(x)+h(y)；

s.t.a(x,y)≤P

In the present embodiment, the packet loss information of a RTP Media Stream determined by transmitting apparatus; According to described packet loss information determination media encoding parameters and transformation parameter; Described transmitting apparatus sends the 2nd RTP Media Stream according to described media encoding parameters and transformation parameter, therefore the embodiment of the present invention can determine different media encoding parameters and transformation parameter for different packet loss information, thus effectively can alleviate the packet loss problem of RTP Media Stream between transmitting apparatus and receiving equipment, improve the efficiency of transmission of RTP Media Stream.

See Fig. 7, be the receiving equipment structural representation of RTP Media Stream of the present invention, this receiving equipment 700 can comprise: the second processor 710, second memory 720, second transceiver 730 and the second bus 740;

Second processor 710, second memory 720, second transceiver 730 are interconnected by the second bus 740; Second bus 740 can be isa bus, pci bus or eisa bus etc.Described second bus 740 can be divided into address bus, data/address bus, control bus etc.For ease of representing, only representing with a thick line in Fig. 7, but not representing the bus only having a bus or a type.

Second memory 720, for depositing program, described program is for realizing the RTP media stream transmission method of Fig. 2 and middle receiving equipment execution embodiment illustrated in fig. 3.Particularly, program can comprise program code, and described program code comprises computer-managed instruction.Second memory 720 may comprise high-speed RAM memory, still may comprise nonvolatile memory (non-volatilememory), such as at least one magnetic disc store.

Second transceiver 730, for connecting other equipment, as transmitting apparatus, server and remote host etc., and communicates with other equipment.Concrete, the RTP Media Stream that second transceiver 730 sends for receiving transmitting apparatus; To send sequence number relevant information to described transmitting apparatus, so that described transmitting apparatus is according to described sequence number relevant information, in described feedback cycle, in the actual RTP Media Stream sent, the serial number information of packet is determined the packet loss information of a RTP Media Stream, determined media encoding parameters and the transformation parameter of the 2nd RTP Media Stream to be sent according to described packet loss information; Receive the 2nd RTP Media Stream that described transmitting apparatus sends according to described media encoding parameters and transformation parameter;

Described second processor 710 performs the described program code stored in second memory 720, for: the RTP Media Stream received in a feedback cycle according to described second transceiver 730 determines the sequence number relevant information of a RTP Media Stream, and described sequence number relevant information is the serial number information of packet in the RTP Media Stream that receives in a feedback cycle of described second transceiver 730.

Preferably, described sequence number relevant information is realized by bag assortment bitmap, and described second processor 710 specifically may be used for: the serial number information determining packet in the RTP Media Stream received in a feedback cycle; Described bag arrangement bitmap is generated according to described serial number information.

In the present embodiment, receiving equipment generates sequence number relevant information according to the serial number information of packet in the RTP Media Stream received in a feedback cycle, described sequence number relevant information is sent to described transmitting apparatus, so that described transmitting apparatus is according to sequence number relevant information, in described feedback cycle, in the actual RTP Media Stream sent, the serial number information of packet determines the packet loss information of RTP Media Stream, and then determine media encoding parameters and transformation parameter, transmitting apparatus can carry out the transmission of the 2nd RTP Media Stream according to the described media encoding parameters determined and transformation parameter afterwards, therefore the embodiment of the present invention effectively can alleviate the packet loss problem of Media Stream between transmitting apparatus and receiving equipment, improve the efficiency of transmission of RTP Media Stream.

The embodiment of the present invention also provides a kind of transmission system of realtime transmission protocol RTP Media Stream, shown in Figure 8, and this system 800 comprises transmitting apparatus 810 and receiving equipment 820, wherein,

Described transmitting apparatus 810, for sending a RTP Media Stream to receiving equipment 820, receive the sequence number relevant information that described receiving equipment 820 sends, described sequence number relevant information is the serial number information of packet in the described RTP Media Stream that receives in a feedback cycle of described receiving equipment 820, according to described sequence number relevant information, in described feedback cycle, in the actual described RTP Media Stream sent, the serial number information of packet determines the packet loss information of a RTP Media Stream, media encoding parameters and the transformation parameter of the 2nd RTP Media Stream to be sent is determined according to described packet loss information, and send described 2nd RTP Media Stream to described receiving equipment,

Described receiving equipment 820, for receiving the RTP Media Stream that transmitting apparatus 810 sends, determine the sequence number relevant information of a RTP Media Stream, described sequence number relevant information is the serial number information of packet in the RTP Media Stream that receives in a feedback cycle of described receiving equipment, described sequence number relevant information is sent to described transmitting apparatus 810, so that described transmitting apparatus according to described sequence number relevant information and in described feedback cycle in the actual RTP Media Stream sent the serial number information of packet determine the packet loss information of a RTP Media Stream, media encoding parameters and the transformation parameter of the 2nd RTP Media Stream that described transmitting apparatus 810 is to be sent is determined according to described packet loss information, receive the 2nd RTP Media Stream that described transmitting apparatus 810 sends according to described media encoding parameters and transformation parameter.

Preferably, described transmitting apparatus 810 specifically may be used for realizing in the following manner described according to described sequence number relevant information, in described feedback cycle, in the actual described RTP Media Stream sent, the serial number information of packet determines the packet loss information of a RTP Media Stream:

Preferably, described transmitting apparatus 810 specifically may be used for realizing described media encoding parameters and the transformation parameter of determining the 2nd RTP Media Stream to be sent according to described packet loss information in the following manner:

Those skilled in the art can be well understood to the mode that technology in the embodiment of the present invention can add required general hardware platform by software and realize.Based on such understanding, technical scheme in the embodiment of the present invention can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product can be stored in storage medium, as ROM/RAM, magnetic disc, CD etc., comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform the method described in some part of each embodiment of the present invention or embodiment.

Each embodiment in this specification all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually see, what each embodiment stressed is the difference with other embodiments.Especially, for system embodiment, because it is substantially similar to embodiment of the method, so description is fairly simple, relevant part illustrates see the part of embodiment of the method.

Above-described embodiment of the present invention, does not form limiting the scope of the present invention.Any amendment done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.

Claims

1. a transmission method for realtime transmission protocol RTP Media Stream, is characterized in that, comprising:

Transmitting apparatus sends a RTP Media Stream to receiving equipment;

According to described sequence number relevant information, in described feedback cycle, in the actual described RTP Media Stream sent, the serial number information of packet determines the packet loss information of a RTP Media Stream, comprising:

If do not mated with random loss characteristic, determine that the packet loss information of RTP Media Stream is Bandwidth-Constrained;

2. method according to claim 1, is characterized in that, described media encoding parameters and the transformation parameter determining the 2nd RTP Media Stream to be sent according to described packet loss information, comprising:

3. method according to claim 2, is characterized in that, described media encoding parameters and the transformation parameter determining the 2nd RTP Media Stream to be sent according to described packet loss information and described network constraint parameter, comprising:

maxf(x,y)＝g(x)+h(y)；

s.t.a(x,y)≤P

Wherein, x presentation medium coding parameter, y represents transformation parameter; G (x) presentation medium coding parameter is obtainable media quality mark under lossless network; H (y) expression is proofreaded the impact of described media quality mark based on described transformation parameter; F (x, y) represents the media quality mark that described media encoding parameters and transformation parameter obtain under real network; A (x, y) presentation medium coding parameter and network constraint parameter corresponding to transformation parameter, P represents the network constraint parameter that described packet loss information is corresponding.

4. a transmission method for realtime transmission protocol RTP Media Stream, is characterized in that, comprising:

Described sequence number relevant information is sent to described transmitting apparatus, so that described transmitting apparatus according to described sequence number relevant information and in described feedback cycle in the actual RTP Media Stream sent the serial number information of packet determine the packet loss information of a RTP Media Stream, according to described sequence number relevant information and in described feedback cycle the serial number information of the actual packet sent determine the sequence of each packet whether packet loss according to the sending order record of packet, according to the randomness of the position judgment packet packet loss of packet in described accepting state sequence of packet loss whether with random loss characteristics match, determine that the packet loss information of RTP Media Stream is random loss according to random loss characteristics match, determine that the packet loss information of RTP Media Stream is Bandwidth-Constrained according to not mating with random loss characteristic, media encoding parameters and the transformation parameter of the 2nd RTP Media Stream that described transmitting apparatus is to be sent is determined according to described packet loss information,

5. method according to claim 4, is characterized in that, described sequence number relevant information is realized by bag arrangement bitmap, describedly determines that the sequence number relevant information of a RTP Media Stream comprises:

6. a transmitting device for realtime transmission protocol RTP Media Stream, is characterized in that, comprising:

Described packet loss information determination unit comprises:

Reason determination subelement, for the position judgment packet packet loss in the accepting state sequence of described packet determined at described sequence determination subelement according to the packet of packet loss randomness whether with random loss characteristics match, if with random loss characteristics match, then determine that the packet loss information of Media Stream is random loss; Otherwise, determine that the packet loss information of Media Stream is Bandwidth-Constrained;

7. device according to claim 6, is characterized in that, described parameter determination unit comprises:

8. device according to claim 7, is characterized in that, the second parameter determination subelement specifically for:

maxf(x,y)＝g(x)+h(y)；

s.t.a(x,y)≤P

9. a transmitting device for realtime transmission protocol RTP Media Stream, is characterized in that, comprising:

Second transmitting element, for sending the described sequence number relevant information that described information determination unit is determined to described transmitting apparatus, so that described transmitting apparatus according to described sequence number relevant information and in described feedback cycle in the actual RTP Media Stream sent the serial number information of packet determine the packet loss information of a RTP Media Stream, according to described sequence number relevant information and in described feedback cycle the serial number information of the actual packet sent determine the sequence of each packet whether packet loss according to the sending order record of packet, according to the randomness of the position judgment packet packet loss of packet in described accepting state sequence of packet loss whether with random loss characteristics match, determine that the packet loss information of RTP Media Stream is random loss according to random loss characteristics match, determine that the packet loss information of RTP Media Stream is Bandwidth-Constrained according to not mating with random loss characteristic, media encoding parameters and the transformation parameter of the 2nd RTP Media Stream that described transmitting apparatus is to be sent is determined according to described packet loss information,

10. device according to claim 9, is characterized in that, described sequence number relevant information by bag arrangement bitmap realize, described information determination unit specifically for:

The transmission system of 11. 1 kinds of realtime transmission protocol RTP Media Streams, is characterized in that, comprises transmitting apparatus and receiving equipment, wherein,

Described transmitting apparatus is described according to described sequence number relevant information, in described feedback cycle, in the actual described RTP Media Stream sent, the serial number information of packet determines the packet loss information of a RTP Media Stream specifically for realizing in the following manner:

12. systems according to claim 11, is characterized in that, described transmitting apparatus is specifically for realizing described media encoding parameters and the transformation parameter of determining the 2nd RTP Media Stream to be sent according to described packet loss information in the following manner: