CN106603518A - Time stamp generating method and time stamp generating device of real-time transmission protocol system - Google Patents
Time stamp generating method and time stamp generating device of real-time transmission protocol system Download PDFInfo
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- CN106603518A CN106603518A CN201611102465.3A CN201611102465A CN106603518A CN 106603518 A CN106603518 A CN 106603518A CN 201611102465 A CN201611102465 A CN 201611102465A CN 106603518 A CN106603518 A CN 106603518A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/65—Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
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Abstract
The invention discloses a time stamp generating method and a time stamp generating device of a real-time transmission protocol system. When system time is not modified, a time difference between a current time value and a last time value is calculated, and the time difference is added to a last time output value to be used as a current time output value. When time hopping occurs, the time difference is not calculated, and the last time difference is added to the last time output value to be used as the current time output value. A time output value of a current data frame is multiplied by a data sampling rate to acquire the time stamp of the current data frame, and therefore a problem of time stamp hopping caused by the modification of the system time is solved, and the generating error of the time stamp is reduced.
Description
Technical field
The application is related to field, more particularly to a kind of timestamp generation method and device of RTP system.
Background technology
Timestamp reflects the sampling instant of the first character section of the data in RTP packets.In a session start
Timestamp initial value is also randomly selected.Even send without signal, the numerical value of timestamp also will constantly increase with the time
Plus.Receiving terminal use time stamp can accurately know which data block should be at what time reduced, so as to eliminate transmission in
Shake.Timestamp may further be used to make sound and image synchronization in Video Applications.
In prior art, timestamp has typically followed the example of two kinds.The first is followed the example of：The random time for generating video flowing initial frame
Stamp, is designated as T0, and according to frame per second and video sampling rate timestamp increment is calculated.For example：Video sampling rate is 90000, and frame per second is 25,
RTP timestamps unit is 1/90000, and the time interval per frame is 0.04 second, RTP timestamps increment=90000 × 0.04=
3600, Delta=3600 is designated as, afterwards, to each frame i (i is the natural number more than 0), corresponding time stamp T i=Ti-1+
Delta.Follow the example of for second：When video encoder compiles out a frame data, by system function, current time is got with respect to 1970
The time difference on January 1, in, is designated as D0, and unit is the second；This value is converted into into RTP timestamps.For example：Video sampling rate is
90000, RTP timestamp units are 1/90000, then RTP time stamp T 0=D0 × 90000, and afterwards the timestamp of each frame is all pressed
Said method circulation is obtained, i.e.,：Ti=Di × 90000.
Above two follows the example of that there are the following problems：The first is followed the example of and belongs to ideal and follow the example of, in actual applications, Video coding
It is to fix 0.04 second that device does not ensure that every frame video data compiles out the time used, so the Delta values of reality are meetings
Change therewith, if Delta is fixed takes 3600, application time length has deviation accumulation, and error can be increasing, most
After cause client to receive decoding after video flowing to occur abnormal and stop.Follow the example of for second be in actual applications use it is more
Follow the example of, be actually to have taken to encode out corresponding actual time (with respect to the time difference on January 1st, 1970) per frame data, no
Have deviation accumulation, but it is this follow the example of presence problem be：When system time is changed, the timestamp got also can be and then
Saltus step, can cause client to receive decoding after video flowing and occur abnormal and stop.
To sum up, can solve the problem that because system time is repaiied also without a kind of preferable timestamp generation method in prior art
The timestamp for changing and causing follows the problem of saltus step.
The content of the invention
The application provides a kind of timestamp generation method and device of RTP system, when can solve because of system
Between the problem of saltus step is followed by the timestamp changed and cause, reduce the generation error of timestamp.
According to the application's in a first aspect, the application provides a kind of timestamp generation method of RTP system,
Including：Obtain the time value of the last data frame of the time value and the current data frame of current data frame；Count respectively
Calculate the time value of the current data frame and the first difference D of Preset TimeiAnd the last data of the current data frame
The time value of frame and the second difference D of Preset Timei-1；According to the difference between first difference and second difference
The absolute value of size | Di–Di-1| judge whether system time occurs saltus step；If it is not, then by Di-Di-1As the first standby difference
Delta, by the described first standby difference Delta and time output valve Out of last data framei-1It is added, obtains current data frame
Time output valve Outi；If so, the last data frame of the last data frame is then obtained, as the 3rd Frame, is obtained respectively
Take the time value of the last data frame and the time value of the 3rd Frame；The current data frame is calculated respectively
The time value of last data frame and the second difference D of Preset Timei-1And the time value of the 3rd Frame with it is default
3rd difference D of timei-2；By Di-1-Di-2As the second standby difference Delta', by the described second standby difference Delta' with
Time output valve Out of last data framei-1It is added, obtains time output valve Out of current data framei；By the current data
Time output valve Out of frameiIt is multiplied with the sample rate of data, obtains the timestamp of current data frame.
According to the second aspect of the application, the application provides a kind of timestamp generating means of RTP system,
Including：Acquiring unit, for obtain the time value of current data frame and the last data frame of the current data frame when
Between value；First difference computational unit, for calculating the time value of the current data frame and the first of Preset Time respectively
Difference DiAnd the second difference D of the time value of the last data frame of the current data frame and Preset Timei-1；Absolute value
Size judging unit, for according to the absolute value of the size of the difference between first difference and second difference | Di–Di-1|
Judge whether system time occurs saltus step；Very first time output valve computing unit, in the order of magnitude judging unit
Judged result for it is no when, by Di-Di-1As the first standby difference Delta, by the described first standby difference Delta with it is previous
Time output valve Out of Framei-1It is added, obtains time output valve Out of current data framei；Time value unit, is used for
When the judged result of the order of magnitude judging unit is to be, the last data frame of the last data frame is obtained, as
3rd Frame, obtains respectively the time value of the last data frame and the time value of the 3rd Frame；Second is poor
Value computing unit, it is poor with the second of Preset Time for calculating the time value of last data frame of the current data frame respectively
Value Di-1And the 3rd difference D of the time value of the 3rd Frame and Preset Timei-2；Second time output valve calculates single
Unit, for by Di-1-Di-2As the second standby difference Delta', by the described second standby difference Delta' and last data frame
Time output valve Outi-1It is added, obtains time output valve Out of current data framei；Timestamp signal generating unit, for will be described
Time output valve Out of current data frameiIt is multiplied with the sample rate of data, obtains the timestamp of current data frame.
The timestamp generation method and device of the RTP system of the application, the time for obtaining current data frame takes
The time value of the last data frame of value and current data frame, calculates respectively the time value and Preset Time of current data frame
The first difference DiAnd the second difference D of the time value of the last data frame of current data frame and Preset Timei-1, according to
The absolute value of the size of the difference between the first difference and second difference | Di–Di-1| judge whether system time occurs saltus step,
If it is not, then by Di-Di-1It is as the first standby difference Delta, the first standby difference Delta is defeated with the time of last data frame
Go out value Outi-1It is added, obtains time output valve Out of current data framei；If so, the previous of current data frame is then obtained respectively
The time value of Frame and the time value of the first two frame data frame of present frame, calculate respectively the last data of current data frame
The time value of frame and the second difference D of Preset Timei-1And the time value of the first two frame data frame and the 3rd of Preset Time
Difference Di-2；By Di-1-Di-2As the second standby difference Delta', by the second standby difference Delta' and last data frame when
Between output valve Outi-1It is added, obtains time output valve Out of current data framei.Finally, the time of current data frame is exported
Value OutiIt is multiplied with the sample rate of data, obtains the timestamp of current data frame, solution is changed and caused because of system time
Timestamp follows the problem of saltus step, effectively reduces the generation error of timestamp.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become from the description with reference to accompanying drawings below to embodiment
Substantially with it is easy to understand, wherein：
Fig. 1 is the timestamp generation method flow chart of the RTP system of the embodiment of the present application；
Fig. 2 is the timestamp generating means structural representation of the RTP system of the embodiment of the present application；
Fig. 3 is another structural representation of timestamp generating means of the RTP system of the embodiment of the present application.
Specific embodiment
Accompanying drawing is combined below by specific embodiment to be described in further detail the present invention.The application provides a kind of real
When host-host protocol system timestamp generation method and device, it is possible to reduce the generation error of timestamp.
Embodiment one：
Fig. 1 is referred to, Fig. 1 is the method flow diagram of the embodiment of the present application one, as shown in figure 1, the embodiment of the present application is provided
A kind of timestamp generation method of RTP system, specifically may comprise steps of：
The time value of S101, the last data frame of the time value and current data frame of acquisition current data frame.
First difference D of S102, the time value that current data frame is calculated respectively and Preset TimeiAnd current data frame
Last data frame time value and Preset Time the second difference Di-1。
S103, according to the absolute value of the size of the difference between the first difference and the second difference | Di–Di-1| judge system time
Whether saltus step there is, if it is not, then execution step S104 and S109, if so, then execution step S105-S109.
The process of judgement can be specifically：Judge the exhausted of size of the difference between first difference and second difference
To value | Di–Di-1| whether more than preset value, if, then it represents that there is saltus step in system time, if not, then it represents that system time is not
Saltus step.
Preferably, preset value is 2S.I.e. difference is more than 2S, represents system time saltus step, and if less than two seconds, then acquiescence was
There is no saltus step in the system time.
S104, by Di-Di-1As the first standby difference Delta, by the first standby difference Delta and last data frame
Time output valve Outi-1It is added, obtains time output valve Out of current data framei。
S105, the last data frame for obtaining last data frame, as the 3rd Frame, obtain respectively the last data frame
Time value and the 3rd Frame time value.
The Frame of the front cross frame of above-mentioned steps S105 namely acquisition current data frame, with the i-th Frame current number is represented
According to frame, then the last data frame of above-mentioned last data frame is the i-th -2 Frame.In order to subsequently state conveniently, before described
The last data frame of one frame data frame is expressed as the 3rd Frame.
The time value and the second difference D of Preset Time of S106, respectively the last data frame of calculating current data framei-1
And the 3rd Frame time value and Preset Time the 3rd difference Di-2。
S107, by Di-1-Di-2Difference as the second standby difference Delta', by the second standby difference Delta' with it is previous
Time output valve Out of Framei-1It is added, obtains time output valve Out of current data framei。
S108, by time output valve Out of current data frameiIt is multiplied with the sample rate of data, obtains current data frame
Timestamp.
In a kind of embodiment, the application method also includes：Obtain the time value and Preset Time of the 0th frame data frame
Time difference D0, by D0As the time output valve of the 0th frame data frame.
In initial code, with D0As the time output valve of first frame data frame.It is understood that follow-up each frame when
Between output valve be all to be calculated on the basis of previous frame time output valve.
Embodiment two：
The embodiment of the present application provides a kind of timestamp generation method of RTP system, specifically can include following
Step：
It is S201, initial, while video encoder encodes out the 0th frame video data frame, obtain current time T0 and default
Time difference D between time Tb0, as time reference point, while by current time output valve Out0=D0, that is, by time base
D on schedule0As time output valve Out of primary data frame0Output.
Preset time T b can be on January 1st, 1, and this example is described with this time.It is understood that default
Time is for use as the reference time, and the specific time point of preset time T b can also be other date-times in this example, such as
On January 1st, 1971, specifically when preset time T b is arranged, can according to the actual requirements and computational accuracy takes Preset Time
To millisecond rank, it is worth pointing out that in this example preset time T b be to maintain in whole calculating process it is constant.
Time difference between S202, time value Ti of acquisition current data frame and preset time T b, obtains the first difference
Di；Obtain time value Ti of the last data frame of current data frame ' with the second difference D of preset time T bi-1。
This example is illustrated by taking system present encoding to the 5th frame data frame as an example.It is understood that this example is equally applicable
The timestamp generating mode of each Frame before each Frame after the 5th frame and the 5th frame.
In above-mentioned steps S202, the time difference between time value Ti and preset time T b of current data frame is obtained, obtained
To the first difference DiIt is exemplified as：Time value T5 of the 5th frame data frame and the time difference of preset time T b are obtained, the first difference is obtained
Value D5。
In above-mentioned steps S202, time value Ti of the last data frame of current data frame is obtained ' and preset time T b
Second difference Di-1It is exemplified as：Time value T4 of the 4th frame data frame and the time difference of preset time T b are obtained, the second difference is obtained
Value D4。
S203, according to the first difference DiWith the second difference Di-1Between size of the difference absolute value | Di–Di-1| judge system
Whether the time there is saltus step, if it is not, then execution step S204-S205 and step 210, if so, then execution step S206-S210.
Judge that the process whether system time occurs saltus step is exemplified as in above-mentioned steps S203：According to the first difference D5With
Two differences D4Between size of the difference absolute value | D5–D4| judge whether system time occurs saltus step.
S204, by Di-Di-1As the first standby difference Delta.
S205, by time output valve Out of the first standby difference Delta and last data framei-1It is added, obtains current number
According to time output valve Out of framei。
Can be according to practical application scene：Calculate the time value of the 5th frame data frame and the first of on January 1st, 1970
Difference D5, calculate the time value and the first difference D between 1 day January in 1970 of the 4th frame data frame4。
Above-mentioned steps S204-S205 are：By D5-D4Value as the first standby difference Delta.
By Delta and time output valve Out of the 4th frame data frame4It is added, obtains the time output valve of current data frame
Out5.I.e.：Out5=Out4+ Delta=Out4+D5-D4。
S206, the last data frame for obtaining last data frame, as the 3rd Frame, obtain respectively last data frame when
Between value and the 3rd Frame time value.
In the present embodiment application scenarios, step S206, as the 3rd Frame, obtains the 3rd frame to obtain the 3rd frame data frame
The time value of the 4th frame data frame of time value and acquisition of Frame.
The time value and the second difference D of Preset Time of S207, respectively the last data frame of calculating current data framei-1
And the 3rd Frame time value and Preset Time the 3rd difference Di-2。
In the present embodiment application scenarios, above-mentioned steps S207 are：Obtain time value T4 of the 4th frame data frame with it is default when
Between Tb time difference, obtain the second difference D4, and, obtain the 3rd frame data frame time value T3 and preset time T b when
Between it is poor, obtain the 3rd difference D3。
S208, by Di-1-Di-2As the second standby difference Delta'.
S209, by time output valve Out of last data framei-1With the second standby difference Delta ' it is added, the numerical value for obtaining
Time output valve Out of current data framei。
Can be according to practical application scene：Calculate the time value of the 4th frame data frame and the second of on January 1st, 1970
Difference D4, calculate the time value and the 3rd difference D between 1 day January in 1970 of the 3rd frame data frame3。
Above-mentioned steps S208-S209 are：By D4-D3Value as the second standby difference Delta '.
By Delta ' and time output valve Out of the 4th frame data frame4It is added, obtains the time output valve of current data frame
Out5.I.e.：Out5=Out4+Delta’.That is, Out5=Out4+D4-D3。
S210, by time output valve Out of current data frameiIt is multiplied with the sample rate of data, obtains current data frame
Timestamp.
Hypothesis timestamp is TC, sample rate is f, and to calculate the timestamp of the 5th frame as example, then step S210 can be：
When system time does not change, TC=Out5× f=(Out4+D5-D4)×f
When system time is changed, TC=Out5× f=(Out4+D4-D3)×f
Embodiment three：
Fig. 2 is referred to, Fig. 2 is the structural representation of the embodiment of the present application two, as shown in Fig. 2 the embodiment of the present application is provided
A kind of timestamp generating means of RTP system, can include：
Acquiring unit 30, for obtaining the time value of current data frame and the last data frame of the current data frame
Time value.
First difference computational unit 31, for calculating the of the time value of the current data frame and Preset Time respectively
One difference DiAnd the second difference D of the time value of the last data frame of the current data frame and Preset Timei-1。
Order of magnitude judging unit 32, for according to the size of the difference between first difference and second difference
Absolute value | Di–Di-1| judge whether system time occurs saltus step.
Very first time output valve computing unit 33, for the judged result of order of magnitude judging unit 32 for it is no when,
By Di-Di-1As the first standby difference Delta, by the described first standby difference Delta and the time output valve of last data frame
Outi-1It is added, obtains time output valve Out of current data framei。
Time value unit 34, during for the judged result of 32 yuan of list to be judged in order of magnitude to be, before acquisition is described
The last data frame of one Frame, as the 3rd Frame, obtains respectively the time value and described of the last data frame
The time value of three Frames.
Second difference computational unit 35, for calculate respectively the current data frame last data frame time value with
Second difference D of Preset Timei-1And the 3rd difference D of the time value of the 3rd Frame and Preset Timei-2。
Second time output valve computing unit 36, for by Di-1-Di-2As the second standby difference Delta', by described
Time output valve Out of two standby differences Delta' and last data framei-1It is added, obtains the time output valve of current data frame
Outi。
Timestamp signal generating unit 37, for by time output valve Out of the current data frameiWith the sample rate phase of data
Take advantage of, obtain the timestamp of current data frame.
In one embodiment, order of magnitude judging unit 30 specifically for：
Judge the absolute value of the size of the difference between first difference and second difference | Di–Di-1| whether it is more than
Preset value, if, then it represents that there is saltus step in system time, if not, then it represents that the non-saltus step of system time.
Preferably, preset value is 2S.
In one embodiment, as shown in figure 3, the present embodiment device also includes：Initial acquisition unit 38, for obtaining the 0th
The time value of frame data frame and time difference D of Preset Time0, by D0As the time output valve of the 0th frame data frame.
The timestamp generation method and device of the RTP system of the application, when system time is not changed
When, calculate this time difference with time last time value, time difference is added in the time output valve of last time as this
Time output valve.If there is saltus step the time, time difference is no longer calculated, the time difference calculated with last time is added to last time
In time output valve, as this time output valve.Finally by the time output valve of current data frame and the sample rate of data
It is multiplied, obtains the timestamp of current data frame, solves because system time follows asking for saltus step by the timestamp changed and causing
Topic, reduces the generation error of timestamp.
Above content is to combine specific embodiment further description made for the present invention, it is impossible to assert this
It is bright to be embodied as being confined to these explanations.For general technical staff of the technical field of the invention, do not taking off
On the premise of present inventive concept, some simple deduction or replace can also be made.
Claims (8)
1. a kind of timestamp generation method of RTP system, it is characterised in that include：
Obtain the time value of the last data frame of the time value and the current data frame of current data frame；
The time value of the current data frame and the first difference D of Preset Time are calculated respectivelyiAnd the current data frame
The time value of last data frame and the second difference D of Preset Timei-1；
According to the absolute value of the size of the difference between first difference and second difference | Di–Di-1| judge that system time is
No generation saltus step；
If it is not, then by Di-Di-1As the first standby difference Delta, by the described first standby difference Delta and last data frame
Time output valve Outi-1It is added, obtains time output valve Out of current data framei；
If so, the last data frame of the last data frame is then obtained, as the 3rd Frame, the last data is obtained respectively
The time value of the time value of frame and the 3rd Frame；
The time value of the last data frame of the current data frame and the second difference D of Preset Time are calculated respectivelyi-1And institute
State the time value of the 3rd Frame and the 3rd difference D of Preset Timei-2；
By Di-1-Di-2As the second standby difference Delta', by the described second standby difference Delta' and last data frame when
Between output valve Outi-1It is added, obtains time output valve Out of current data framei；
By time output valve Out of the current data frameiIt is multiplied with the sample rate of data, obtains the timestamp of current data frame.
2. the timestamp generation method of RTP system as claimed in claim 1, it is characterised in that described according to institute
State the absolute value of the size of the difference between the first difference and second difference | Di–Di-1| judge whether system time jumps
Change includes：
Judge the absolute value of the size of the difference between first difference and second difference | Di–Di-1| whether more than default
Value, if, then it represents that there is saltus step in system time, if not, then it represents that the non-saltus step of system time.
3. the timestamp generation method of RTP system as claimed in claim 3, it is characterised in that the preset value
For 2S.
4. the timestamp generation method of the RTP system as described in any one in claim 1-3, its feature exists
In also including：
Obtain the time value of the 0th frame data frame and time difference D of Preset Time0, by D0As the time of the 0th frame data frame
Output valve.
5. a kind of timestamp generating means of RTP system, it is characterised in that include：
Acquiring unit, for obtaining the time of the time value of current data frame and the last data frame of the current data frame
Value；
First difference computational unit, for calculating the time value of the current data frame and the first difference of Preset Time respectively
DiAnd the second difference D of the time value of the last data frame of the current data frame and Preset Timei-1；
Order of magnitude judging unit, for according to the absolute of the size of the difference between first difference and second difference
Value | Di–Di-1| judge whether system time occurs saltus step；
Very first time output valve computing unit, for when the judged result of the order of magnitude judging unit is no, by Di-
Di-1As the first standby difference Delta, by the described first standby difference Delta and time output valve Out of last data framei-1
It is added, obtains time output valve Out of current data framei；
Time value unit, for when the judged result of the order of magnitude judging unit is to be, obtaining the previous number
According to the last data frame of frame, as the 3rd Frame, the time value and the 3rd number of the last data frame are obtained respectively
According to the time value of frame；
Second difference computational unit, for calculate respectively the current data frame last data frame time value with it is default when
Between the second difference Di-1And the 3rd difference D of the time value of the 3rd Frame and Preset Timei-2；
Second time output valve computing unit, for by Di-1-Di-2It is standby by described second as the second standby difference Delta'
Time output valve Out of difference Delta' and last data framei-1It is added, obtains time output valve Out of current data framei；
Timestamp signal generating unit, for by time output valve Out of the current data frameiIt is multiplied with the sample rate of data, obtains
The timestamp of current data frame.
6. timestamp generating means of RTP system as claimed in claim 5, it is characterised in that the absolute value
Size judging unit specifically for：
Judge the absolute value of the size of the difference between first difference and second difference | Di–Di-1| whether more than default
Value, if, then it represents that there is saltus step in system time, if not, then it represents that the non-saltus step of system time.
7. timestamp generating means of RTP system as claimed in claim 6, it is characterised in that the preset value
For 2S.
8. timestamp generating means of the RTP system as described in any one in claim 5-7, its feature exists
In also including：
Initial acquisition unit, for obtaining the time value of the 0th frame data frame and time difference D of Preset Time0, by D0As
The time output valve of zero frame data frame.
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| CN111277896A (en) * | 2020-02-13 | 2020-06-12 | 上海高重信息科技有限公司 | Method and device for splicing network video stream images |
| CN111629241A (en) * | 2020-05-22 | 2020-09-04 | 海信电子科技（深圳）有限公司 | Method for providing time information in physical layer signaling and display equipment |
| CN114726658A (en) * | 2020-08-31 | 2022-07-08 | 华为技术有限公司 | Method and device |
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