CN106878792A - The audio synchronization method of video stream - Google Patents
The audio synchronization method of video stream Download PDFInfo
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- CN106878792A CN106878792A CN201710150679.6A CN201710150679A CN106878792A CN 106878792 A CN106878792 A CN 106878792A CN 201710150679 A CN201710150679 A CN 201710150679A CN 106878792 A CN106878792 A CN 106878792A
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- voice data
- resampling
- sample rate
- video stream
- time stamp
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4305—Synchronising client clock from received content stream, e.g. locking decoder clock with encoder clock, extraction of the PCR packets
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4307—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/85—Assembly of content; Generation of multimedia applications
- H04N21/854—Content authoring
- H04N21/8547—Content authoring involving timestamps for synchronizing content
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Television Systems (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
A kind of audio synchronization method of video stream, is suitable to obtain video stream to be played in second device from first device, and methods described includes：A time voice data in video stream is captured, voice data has the first sample rate；Capture the Presentation Time Stamp of voice data；Capture the Program Clock Reference label of second device；According to Presentation Time Stamp and Program Clock Reference label, judge whether to need to carry out resampling to voice data；When need not carry out resampling to voice data, with the first sample rate playing audio-fequency data；When needing to carry out resampling to voice data, resampling rate is determined according to the first sample rate, Presentation Time Stamp and Program Clock Reference label；Carry out resampling to voice data to produce a resampling voice data with resampling rate；And resampling voice data is played with the first sample rate.The present invention can reduce the time difference that voice data is played with program.
Description
Technical field
Audio synchronization method on a kind of video stream (audio-video stream) of the invention, it is particularly a kind of to answer
With the audio synchronization method of the video stream of resampling technique.
Background technology
Video stream is used in network direct broadcasting, online video, therefore is one important in network service now
Branch.In the broadcasting of video stream, audio and the inconsistent phenomenon of image can sometimes occur, have impact on video stream subscription
The impression of person.
The content of the invention
The invention reside in a kind of audio synchronization method of video stream of offer.
According to the audio synchronization method of the video stream of one embodiment of the invention, it is suitable to obtain video stream from first device
To be played in second device, methods described comprises the following steps：Capture a time voice data in video stream, voice data tool
There is the first sample rate；Capture the Presentation Time Stamp (presentation timestamp, PTS) of voice data；Second is captured to fill
The Program Clock Reference label (program clock reference, PCR) put；During according to Presentation Time Stamp with program reference
Clock label, judges whether to need to carry out resampling to voice data；When judging that resampling need not be carried out to voice data, with
First sample rate playing audio-fequency data；When judging to need to carry out resampling to voice data, during according to the first sample rate, display
Between stamp with Program Clock Reference label determine resampling rate；Carry out resampling to voice data to produce a weight with resampling rate
Sampled audio data；And resampling voice data is played with the first sample rate.
In sum, the audio synchronization method of the video stream disclosed in one embodiment of the invention is joined by comparing program
Clock label and Presentation Time Stamp are examined, optionally to carry out resampling to voice data, and is played with default sample rate
Voice data after treatment, the time difference so as to making voice data be played with program is contracted to not perceived by human ear.
Above is being explanation on this disclosure and the following is implementation method being that explanation is used to demonstrate and explains the present invention
Spirit and principle, and claims of the present invention be provided further explain.
Brief description of the drawings
Fig. 1 is to illustrate to be adapted for carrying out a system architecture schematic diagram of the invention.
Fig. 2 is according to the video stream audio synchronization method flow chart of one embodiment of the invention.
The flow chart of the step of Fig. 3 is according to one embodiment of the invention S240.
The flow chart of the step of Fig. 4 is according to one embodiment of the invention S260.
Fig. 5 is according to the audio-visual broadcasting timing diagram of one embodiment of the invention.
Fig. 6 is according to the audio-visual broadcasting timing diagram of yet another embodiment of the invention.
Fig. 7 is according to the linear interpolation method resampling schematic diagram of one embodiment of the invention.
Wherein, symbol is simply described as follows in accompanying drawing：
1000：First device；2000：Second device；AVS：Video stream；T1、T1’、T2、T2’、T3、T3’、T4、T4’：
Time point；t1、t2、t3：Time point；A1、A2、A3：Sampled value；PCR：Program Clock Reference label；PTS：Presentation Time Stamp.
Specific embodiment
Hereinafter detailed features of the invention and advantage are described in detail in embodiments, its content is enough to make any be familiar with
The personnel of correlation technique understand technology contents of the invention and implement according to this, and content, right according to disclosed by this specification
Claim and accompanying drawing, any personnel for being familiar with correlation technique can be readily understood upon the purpose and advantage of correlation of the invention.Following
Embodiment further describes viewpoint of the invention, but non-anyways limiting scope of the invention.
Fig. 1 and Fig. 2 is refer to, wherein Fig. 1 is used to illustrate to be adapted for carrying out a system architecture schematic diagram of the invention, and Fig. 2 is
According to the video stream audio synchronization method flow chart of one embodiment of the invention.As shown in figure 1, video stream AVS is stored in
One device 1000, and first device 1000 with constant transfer rate to second device 2000 send video stream AVS in order to
Video stream AVS is played in second device 2000.The method of the present invention with hardware circuit or can be implemented on computer
Software realize.As shown in Fig. 2 being comprised the steps of according to the video stream audio synchronization method of one embodiment of the invention.
As shown in step S210, the audio-visual broadcast unit in second device 2000 captures a time voice data from video stream AVS
AD, this voice data has the first sample rate.For example, the data of secondary frame picture (frame) are led to its voice data
Second device 2000 often can be sent to from first device 1000 simultaneously or in succession.Wherein voice data has the first sample rate
For example, 44.1 KHzs, 48 KHzs, 37.8 KHzs or 16 KHzs.For knowing technology, voice data is the
Will be played with the first sample rate in second device 2000 with the first sample rate on one device 1000.Such as step
Shown in S220, second device 2000 captures the Presentation Time Stamp of this voice data from the voice data for receiving
(presentation timestamp,PTS).For example, Presentation Time Stamp should be in a shadow on this voice data
Which point in sound crossfire starts to be played for several seconds.For another example it is used for playing audio-visual string shown in step S230, in second device 2000
Stream audio-visual broadcast unit can capture second device Program Clock Reference label (program clock reference,
PCR).For example, the time of Program Clock Reference tag definition actual program, that is to say, that program has been played rather
Several seconds.After above-mentioned information has been collected, as shown in step S240, audio-visual broadcast unit is joined according to Presentation Time Stamp with program
Clock label is examined, judges whether to need to carry out resampling to voice data.When judgement need not carry out resampling to voice data
When, as shown in step S250, with the first sample rate playing audio-fequency data.Conversely, when needing to carry out resampling to voice data,
As shown in step S260, resampling rate is determined according to the first sample rate, Presentation Time Stamp and Program Clock Reference label.And as walked
Shown in rapid S270, resampling is carried out to voice data with resampling rate.Proceed to step S250 afterwards, played with the first sample rate
The voice data being resampled.
So-called according to Presentation Time Stamp and Program Clock Reference label wherein in step S240, it is right to judge whether to need
Voice data carries out resampling.Refer to Fig. 3, its be according to one embodiment of the invention the step of S240 flow chart.Such as Fig. 3 institutes
Show, in the flow for determining, first as shown in step S241, when audio-visual broadcast unit can judge Presentation Time Stamp with program reference
Whether the clock difference of clock label is more than threshold value.Time defined in clock difference Presentation Time Stamp herein and Program Clock Reference mark
Sign the difference of both the time of current definition.In an embodiment, the time defined in Presentation Time Stamp is exactly that voice data will
The time point played in a program.And the time of Program Clock Reference label currently definition is exactly that second device 2000 is defined
Actual program/the previous time point of voice data will be played, that is, next should play a time sound
The time point of frequency evidence.The definition of threshold value herein is when can discover video and audio on human sensory to have inconsistent minimum
Between, in an embodiment, this threshold value is less than or equal to 90 milliseconds, preferably needs less than or equal to 45 milliseconds.If when clock difference is big
When threshold value, audio-visual broadcast unit judges to need to carry out voice data resampling, therefore proceeds to step S260.If instead
When clock difference is not more than threshold value, audio-visual broadcast unit judges that resampling need not be carried out to voice data.Therefore step is proceeded to
Rapid S250.In other words, if video and inconsistent audio will not be discovered on human sensory, it is not necessary to enter for voice data
Row resampling, but directly play.It is exactly with 44.1 namely when the sample rate of the voice data for receiving is 44.1 KHz
The frequency of KHz carrys out playing audio-fequency data.
If it is determined that need during to voice data resampling, to refer to Fig. 4, the step of it is according to one embodiment of the invention
The flow chart of S260.As shown in figure 4, first as shown in step S261, audio-visual broadcast unit can judge Program Clock Reference label
Whether leading Presentation Time Stamp.When the leading Presentation Time Stamp of Program Clock Reference label, as shown in step S263, adopted with second
Sample rate is used as resampling rate, wherein the second sample rate is less than the first sample rate.For example, if the first sample rate is 44.1 thousand
Hertz, then the second sample rate is, for example, 40 KHzs.Otherwise when Program Clock Reference label falls behind Presentation Time Stamp, such as step
Shown in S265, using the 3rd sample rate as resampling rate, wherein the 3rd sample rate is higher than the first sample rate.For example, if
First sample rate is 44.1 KHzs, then the 3rd sample rate is, for example, 48 KHzs.In an embodiment, the second sample rate and the
The ratio of one sample rate is more than or equal to 0.9 and less than 1.It is preferred that the second sample rate is more than or equal to the ratio of the first sample rate
0.97 and less than 1.In an embodiment, the 3rd sample rate is less than or equal to 1.1 and more than 1 with the ratio of the first sample rate.Preferably
Ground, the 3rd sample rate is less than or equal to 1.03 and more than 1 with the ratio of the first sample rate.
Specifically, Fig. 5 is refer to, it is according to the audio-visual broadcasting timing diagram of one embodiment of the invention.First in the time
Point T1, the Presentation Time Stamp PTS of the first stroke voice data that audio-visual broadcast unit is received marked time point T1 ', and work as prosthomere
The clock difference that mesh reference clock label PCR marked time point T1, wherein time point T1 and time point T1 ' is, for example, 30 milliseconds,
Therefore judged according to the flow of earlier figures 3, resampling is carried out without to the first stroke voice data.Then audio-visual broadcast unit is received
Second voice data, wherein Presentation Time Stamp PTS in second voice data marked time point T2 ', and display is single
First known the first stroke voice data plays and prepares to play second corresponding Program Clock Reference label PCR mark of voice data
Note time point T2.In this, because the clock difference of time point T2 and time point T2 ' is 100 milliseconds, more than threshold value (90 milliseconds), because
This audio-visual broadcast unit can judge to need to carry out resampling to voice data.In this, it is assumed that Program Clock Reference label PCR is defined
Time point T2 for 1 point 35 seconds 100 milliseconds, and the time point T2 ' of the Presentation Time Stamp PTS of second voice data definition is 1
Divide 35 seconds, therefore judge that Program Clock Reference label PCR leads over Presentation Time Stamp PTS.In this, it is necessary to so that second audio
Data are finished playing with the shorter time, come interim to shorten the 3rd voice data, Program Clock Reference label PCR and display
The clock difference of timestamp PTS.Therefore audio-visual broadcast unit selection is adopted again with the second sample rate to second voice data
Sample.As a example by by foregoing first sample rate, for 44.1 KHzs, the second sample rate is 40 KHzs.Assuming that second voice data
It is the length voice data of 1 second, then second voice data that second device 2000 is received has 44100 sampled values, and passes through
Second voice data crossed after resampling only has 40000 sampled values.Originally play original with the sample rate of 44.1 KHzs
Second voice data needed for time for spending be 1 second, if played by resampling with the sample rate of 44.1 KHzs
The time spent needed for second voice data is 907 milliseconds, therefore next should play the 3rd section of voice data
3 milliseconds of the Presentation Time Stamp of only leading 3rd voice data of mesh reference clock label, such difference will not be felt by people
Know.
In another embodiment, Fig. 6 is refer to, it is according to the audio-visual broadcasting timing diagram of yet another embodiment of the invention.It is first
Prior to time point T3, the Presentation Time Stamp PTS of the first stroke voice data that audio-visual broadcast unit is received marked time point T3 ',
And actual program reference clock label PCR marked time point T3, wherein time point T3 is, for example, with the clock difference of time point T3 '
40 milliseconds, therefore judged according to the flow of earlier figures 3, carry out resampling without to the first stroke voice data.Then audio-visual broadcasting
Unit have received second voice data, wherein the Presentation Time Stamp PTS in second voice data marked time point T4 ',
And the first stroke voice data known to display unit plays preparation and to play second corresponding Program Clock Reference of voice data
Label PCR marks time point T4.In this, because the clock difference of time point T4 and time point T4 ' is 100 milliseconds, more than threshold value (90
Millisecond), therefore audio-visual broadcast unit can judge to need to carry out resampling to voice data.In this, it is assumed that Program Clock Reference mark
The time point T4 for signing PCR definition is 35 seconds, and the time point T4 ' of second Presentation Time Stamp PTS definition of voice data is 35
100 milliseconds of second, therefore judge that Program Clock Reference label PCR lags behind Presentation Time Stamp PTS.In this, it is necessary to so that second
Voice data is finished playing with longer time, comes interim to shorten the 3rd voice data, Program Clock Reference label PCR with
The clock difference of Presentation Time Stamp PTS.Therefore audio-visual broadcast unit selection is carried out with the 3rd sample rate to second voice data
Resampling.As a example by by foregoing first sample rate, for 44.1 KHzs, the 3rd sample rate is 48 KHzs.Assuming that second audio
Data are the length voice data of 1 second, then second voice data that second device 2000 is received has 44100 sampled values,
And have 48000 sampled values by second voice data after resampling.Originally played with the sample rate of 44.1 KHzs
The time spent needed for second original voice data is 1 second, if played with the sample rate of 44.1 KHzs adopted through overweight
The time spent needed for second voice data of sample is 1.088 seconds, therefore next should play the 3rd voice data
Program Clock Reference label only fall behind the 3rd 12 milliseconds of the Presentation Time Stamp of voice data, such difference will not be by people
Perceived.
Wherein, in step S270, because resampling rate (the second sample rate or the 3rd sample rate) is different from script audio
The sample rate of data, it is therefore desirable to which resampling is carried out to voice data with interpolation method.Specifically, refer to Fig. 7, its be according to
According to linear interpolation method (linear interpolation) resampling schematic diagram of one embodiment of the invention.As shown in fig. 7, original
Voice data have sampled value A1 in time point t1, and have next sampled value A2 in time point t2.If now in resampling
When need to obtain the sampled value A3 of a time point t3 between time point t1 and time point t2, then can obtain according to following equation
To sampled value A3：
By such method, resampling can be carried out to voice data.Although above-mentioned carry out weight with linear interpolation method
Sampling, but one skilled in the art are after reading embodiments of the disclosure of the present invention, when can be with other interpolation rules
The resampling of voice data is carried out such as polynomial interpolation, trigonometric interpolation or other suitable interpolation methods.
In sum, the audio synchronization method of the video stream disclosed in one embodiment of the invention is joined by comparing program
Clock label and Presentation Time Stamp are examined, optionally to carry out resampling to voice data, and is played with default sample rate
Voice data after treatment, the time difference so as to making voice data be played with program is contracted to not perceived by human ear.
Present pre-ferred embodiments are the foregoing is only, so it is not limited to the scope of the present invention, any to be familiar with sheet
The personnel of item technology, without departing from the spirit and scope of the present invention, further can be improved and be changed on this basis, because
This protection scope of the present invention is defined when the scope defined by following claims.
Claims (8)
1. a kind of audio synchronization method of video stream, it is characterised in that be suitable to obtain video stream to play from first device
In second device, including：
A time voice data in the video stream is captured, this voice data has the first sample rate；
Capture the Presentation Time Stamp of this voice data；
Capture the Program Clock Reference label of the second device；
According to the Presentation Time Stamp and the Program Clock Reference label, judge whether to need to adopt this voice data again
Sample；
When judging that resampling need not be carried out to this voice data, the voice data is played with first sample rate；
When judging to need to carry out resampling to this voice data, according to first sample rate, the Presentation Time Stamp and the section
Mesh reference clock label determines resampling rate；
Resampling is carried out to this voice data with the resampling rate, to obtain a resampling voice data；And
This resampling voice data is played with first sample rate.
2. the audio synchronization method of video stream according to claim 1, it is characterised in that according to the Presentation Time Stamp
With the Program Clock Reference label judge whether need resampling is carried out to this voice data the step of in, including：
Judge the Presentation Time Stamp with the clock difference of the Program Clock Reference label whether more than threshold value；
When the clock difference is more than the threshold value, judge to need to carry out resampling to this voice data；And
When the clock difference is not more than the threshold value, judgement need not carry out resampling to this voice data.
3. the audio synchronization method of video stream according to claim 2, it is characterised in that the threshold value is less than or equal to 90 millis
Second and more than 0 second.
4. the audio synchronization method of video stream according to claim 3, it is characterised in that the threshold value is less than or equal to 45 millis
Second and more than 0 second.
5. the audio synchronization method of video stream according to claim 1, it is characterised in that according to first sampling
In the step of rate, the Presentation Time Stamp and the Program Clock Reference label determine the resampling rate, including：
Judge the whether leading Presentation Time Stamp of the Program Clock Reference label；
When the leading Presentation Time Stamp of the Program Clock Reference label, using the second sample rate as the resampling rate, wherein should
Second sample rate is less than first sample rate；And
When the Program Clock Reference label falls behind the Presentation Time Stamp, using the 3rd sample rate as the resampling rate, wherein should
3rd sample rate is higher than first sample rate.
6. the audio synchronization method of video stream according to claim 5, it is characterised in that second sample rate with this
The ratio of one sample rate is more than or equal to 0.9 and less than 1.
7. the audio synchronization method of video stream according to claim 5, it is characterised in that the 3rd sample rate with this
The ratio of one sample rate is less than or equal to 1.1 and more than 1.
8. the audio synchronization method of video stream according to claim 1, it is characterised in that in the resampling rate to this
In the step of voice data carries out resampling, resampling is carried out with linear interpolation method.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710150679.6A CN106878792A (en) | 2017-03-14 | 2017-03-14 | The audio synchronization method of video stream |
| CN202110031306.3A CN112887772A (en) | 2017-03-14 | 2017-03-14 | Audio synchronization method for video streaming |
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| CN201710150679.6A CN106878792A (en) | 2017-03-14 | 2017-03-14 | The audio synchronization method of video stream |
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| CN202110031306.3A Division CN112887772A (en) | 2017-03-14 | 2017-03-14 | Audio synchronization method for video streaming |
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| CN202110031306.3A Withdrawn CN112887772A (en) | 2017-03-14 | 2017-03-14 | Audio synchronization method for video streaming |
| CN201710150679.6A Pending CN106878792A (en) | 2017-03-14 | 2017-03-14 | The audio synchronization method of video stream |
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| CN112887772A (en) | 2021-06-01 |
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Application publication date: 20170620 |