CN102883217B - Method and device for controlling video playing - Google Patents
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Abstract
An embodiment of the invention discloses a method and a device for controlling video playing and relates to the field of video monitoring. By the method and the device for controlling video playing, fast-forward or fast-backward playing of videos can be controlled by utilizing any frame interval as a unit. The method in the embodiment includes receiving control signals which carry with play frame corresponding to the video playing state; generating a span value according to display frame and the control signals, wherein the span value is a time interval between time stamps of each frame picture in the videos played according to the control signals; judging whether a play frame obtained by decoding is a target play frame or not according to the time stamp of the play frame obtained by decoding, the time stamp of the target play frame obtained by the last decoding and the span value; receiving and caching the play frame obtained by decoding as the target play frame if the play frame obtained by decoding is the target play frame. The method and the device for controlling video playing in the embodiment are mainly applied to control of video playing.
Description
Technical field
The present invention relates to field of video monitoring, particularly relate to a kind of method and the device that control video playback.
Background technology
In field of video monitoring, when carrying out decoding broadcasting to video code flow, need the Play Control often using fast forwarding and fast rewinding to realize viewing one section of particular video frequency or to search a specific picture.Video code flow is made up of key frame and normal frames, the interval of adjacent key frame normally 30 normal frames or more.The Play Control of the fast forwarding and fast rewinding in current video code flow decoding playing process is the key frame realization by detecting code stream.Concrete, when video monitoring system receives the solicited message of F.F. or rewind, by analysis request information, Target key frames is obtained successively by video code flow order, the interval being spaced apart the adjacent key frame of several times of adjacent target key frame, and successively the Target key frames obtained is decoded and play.
In the process realizing the embodiment of the present invention, inventor finds that in prior art, at least there are the following problems: the Play Control of video being carried out to rewind or F.F. realizes by playing Target key frames, due to the interval being spaced apart the adjacent key frame of several times of adjacent target key frame, and adjacent key frame be spaced apart 30 normal frames or more, therefore be realize with the unit that is spaced apart of adjacent key frame to the Play Control that video carries out rewind or F.F., unit to carry out F.F. or rewind Play Control to video can not be spaced apart according to arbitrary frame, specific video or picture cannot be accurately searched from video code flow.
Summary of the invention
In view of this, embodiments of the invention provide a kind of method and the device that control video playback, can be spaced apart unit to carry out F.F. or rewind Play Control to video according to arbitrary frame.
For achieving the above object, embodiments of the invention adopt following technical scheme:
First aspect, embodiments provides a kind of method controlling video playback, comprising: reception control signal, and described control signal carries play frame rate corresponding to video broadcasting condition; Generate span value according to display frame rate and described control signal, described display frame rate is the play frame rate that video normal playing status is corresponding, described span value be carry out every frame picture in the video play according to described control signal timestamp between the time interval; Judge whether the broadcasting frame that current decoding obtains is that target plays frame according to the timestamp of broadcasting frame, the timestamp of the last target broadcasting frame obtained of decoding and described span value that current decoding obtains; If the broadcasting frame that described current decoding obtains is target play frame, then the broadcasting frame described current decoding obtained is play frame as target and is carried out reception and buffer memory.
In conjunction with first aspect, in the implementation that the first is possible, the timestamp of the described broadcasting frame obtained according to current decoding, the last target that obtains of decoding play the timestamp of frame and described span value judges whether the broadcasting frame that current decoding obtains is that target plays frame, comprising: obtain scale value according to the decode timestamp of the target broadcasting frame obtained and described span value of last time; If the timestamp of the broadcasting frame that current decoding obtains does not fall in the scope between the timestamp of the target broadcasting frame that described last time decoding obtains and described scale value, the broadcasting frame that described current decoding obtains is that target plays frame.
In conjunction with the first possible implementation of first aspect, in the implementation that the second is possible, the timestamp of the described broadcasting frame obtained according to current decoding, the timestamp of the last target broadcasting frame obtained of decoding and described span value judge whether the broadcasting frame that current decoding obtains is that target plays frame, also comprise: to decode in scope that the target that obtains plays between the timestamp of frame and described scale value and the absolute value in time interval between the timestamp of broadcasting frame that obtains of current decoding and scale value is less than the first threshold pre-set if the timestamp of broadcasting frame that current decoding obtains falls into the described last time, the broadcasting frame that described current decoding obtains is that target plays frame.
In conjunction with the first possible implementation of first aspect or first aspect, in the implementation that the third is possible, described method also comprises: play frame according to the target of buffer memory and carry out video playback.
In conjunction with the third possible implementation of first aspect, in the 4th kind of possible implementation, described method also comprises: at the timestamp of the described broadcasting frame obtained according to current decoding, the timestamp of the last target broadcasting frame obtained of decoding and described span value judge whether the broadcasting frame that current decoding obtains is after target plays frame, if the broadcasting frame that described current decoding obtains is target play frame, according to the timestamp of the broadcasting frame that current decoding obtains, timestamp and the described span value of the last target broadcasting frame received obtain the display number of times that the described last target received plays frame, the described target according to buffer memory is play frame and is carried out video playback, comprising: carry out video playback according to the display number of times that target broadcasting frame and each target of buffer memory play frame corresponding.
In conjunction with the 4th kind of possible implementation of first aspect, in the 5th kind of possible implementation, described method also comprises: judge whether total display number of times of the target broadcasting frame of buffer memory is less than the Second Threshold pre-set, and total display number of times of the target broadcasting frame of described buffer memory is the display number of times sum of each target broadcasting frame of buffer memory; The described broadcasting frame described current decoding obtained is play frame as target and is carried out reception and buffer memory, comprising:
If total display number of times that the target of buffer memory plays frame is less than the Second Threshold pre-set, then the broadcasting frame described current decoding obtained is play frame as target and is carried out reception and buffer memory; The Second Threshold pre-set described in if total display number of times of the target broadcasting frame of buffer memory is more than or equal to, then wouldn't receive described target play frame and stop decoding to video code flow, until total display number of times that the target of buffer memory plays frame be decremented to be less than described in pre-set Second Threshold time the broadcasting frame that more described current decoding obtained play frame as target and carry out receptions also buffer memory.
Second aspect, embodiments provide a kind of device controlling video playback, comprising: receiving element, for reception control signal, described control signal carries play frame rate corresponding to video broadcasting condition, and described control signal is transferred to the first acquiring unit; First acquiring unit, for generating span value according to the described control signal of display frame rate and the transmission of described receiving element, and described span value is transferred to the first judging unit, described display frame rate is the play frame rate that video normal playing status is corresponding, described span value be carry out every frame picture in the video play according to described control signal timestamp between the time interval; First judging unit, the described span value that the timestamp of broadcasting frame, the timestamp of the last target broadcasting frame obtained of decoding and described first acquiring unit for obtaining according to current decoding transmit judges whether the broadcasting frame that current decoding obtains is that target plays frame; Buffer unit, during for being target broadcasting frame when the broadcasting frame that described current decoding obtains, the broadcasting frame described current decoding obtained is play frame as target and is carried out reception and buffer memory.
In conjunction with second aspect, in the 6th kind of possible implementation, described first judging unit specifically comprises: the first acquisition module, and timestamp and the described span value of the target broadcasting frame obtained for decoding according to the last time obtain scale value; First judge module, when the target obtained for not falling into described last time decoding when the timestamp of the broadcasting frame that current decoding obtains is play in the scope between the timestamp of frame and described scale value, the broadcasting frame that described current decoding obtains is that target plays frame.
In conjunction with the 6th kind of possible implementation of second aspect, in the 7th kind of possible implementation, described first judging unit also comprises: the second judge module, for fall into when the timestamp of the broadcasting frame that current decoding obtains the described last time to decode in scope that the target that obtains plays between the timestamp of frame and described scale value and the absolute value in time interval between the timestamp of broadcasting frame that obtains of current decoding and scale value is less than the first threshold pre-set time, the broadcasting frame that described current decoding obtains is that target plays frame.
In conjunction with the 6th kind of possible implementation of second aspect or second aspect, in the 8th kind of possible implementation, described device also comprises: broadcast unit, carries out video playback for playing frame according to the target of buffer memory.
In conjunction with the 8th kind of possible implementation of the second fermentation, in the 9th kind of possible implementation, described device also comprises: second acquisition unit, for the timestamp at the described broadcasting frame obtained according to current decoding, the timestamp of the last target broadcasting frame obtained of decoding and described span value judge whether the broadcasting frame that current decoding obtains is after target plays frame, if the broadcasting frame that described current decoding obtains is target play frame, according to the timestamp of the broadcasting frame that current decoding obtains, timestamp and the described span value of the last target broadcasting frame received obtain the display number of times that the described last target received plays frame, described broadcast unit, specifically comprises: playing module, carries out video playback for the display number of times playing frame corresponding according to target broadcasting frame and each target of buffer memory.
In conjunction with the 9th kind of possible implementation of the second fermentation, in the tenth kind of possible implementation, described device also comprises: the second judging unit, receptions is carried out also before buffer memory for play frame as target at the described broadcasting frame described current decoding obtained, judge whether total display number of times of the target broadcasting frame of buffer memory is less than the Second Threshold pre-set, total display number of times of the target broadcasting frame of described buffer memory is the display number of times sum of each target broadcasting frame of buffer memory; Described buffer unit, specifically comprises: the 3rd judge module, and for when total display number of times that the target of buffer memory plays frame is less than the Second Threshold pre-set, the broadcasting frame described current decoding obtained is play frame as target and carried out reception and buffer memory; 4th judge module, the Second Threshold pre-set described in total display number of times for playing frame when the target of buffer memory is more than or equal to, then wouldn't receive described target play frame and stop decoding to video code flow, until total display number of times that the target of buffer memory plays frame be decremented to be less than described in pre-set Second Threshold time the broadcasting frame that more described current decoding obtained play frame as target and carry out receptions also buffer memory.
The method of the control video playback that the embodiment of the present invention provides and device, pass through reception control signal, described control signal carries play frame rate corresponding to video broadcasting condition, span value is generated according to display frame rate and described control signal, described display frame rate is the play frame rate that video normal playing status is corresponding, described span value is the time interval between adjacent display frame, described display frame is the frame picture play, according to the timestamp of the broadcasting frame that current decoding obtains, the timestamp of the last target broadcasting frame obtained of decoding and described span value judge whether the broadcasting frame that current decoding obtains is that target plays frame, if the broadcasting frame that described current decoding obtains is target play frame, the broadcasting frame then described current decoding obtained is play frame as target and is carried out reception and buffer memory, video carried out compared with the Play Control of rewind or F.F. with prior art by the unit that is spaced apart with adjacent key frame, by obtaining play frame rate, unit to carry out F.F. or rewind Play Control to video can be spaced apart according to arbitrary frame.
Summary of the invention
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 or description of the prior art 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 a kind of flow chart controlling video playback in the embodiment of the present invention one;
Fig. 2 is the flow chart of the another kind control video playback in the embodiment of the present invention one;
Fig. 3 is a kind of flow chart controlling video playback in the embodiment of the present invention two;
Fig. 4 is a kind of method schematic diagram controlling video playback in the embodiment of the present invention two;
Fig. 5 is the method schematic diagram of the another kind control video playback in the embodiment of the present invention two;
Fig. 6 is a kind of device composition schematic diagram controlling video playback in the embodiment of the present invention three;
Fig. 7 is the device composition schematic diagram of the another kind control video playback in the embodiment of the present invention three.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described 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 making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment one
The embodiment of the present invention provides a kind of method controlling video playback, as shown in Figure 1, comprising:
101, reception control signal, described control signal carries play frame rate corresponding to video broadcasting condition.
Wherein, the play frame rate that the video broadcasting condition that carries of described control signal is corresponding can be set by the user, and also can be that system provides a kind of default value.Described play frame rate can show with the form of numerical value, and play frame rate can be greater than 0, be less than 0 or equal 0 Arbitrary Digit.Picture broadcasting speed during described play frame rate correspondence video playback.The absolute value of play frame rate is larger, and during video playback, picture broadcasting speed is faster.When play frame rate is greater than 0, represent that video is that positive sequence is play; When play frame rate is less than 0, represent that video is Reverse Play; When play frame rate equals 0, represent that video is halted state.
102, span value is generated according to display frame rate and described control signal.
Wherein, described display frame rate is the play frame rate that video normal playing status is corresponding, described span value be carry out every frame picture in the video play according to described control signal timestamp between the time interval.
103, the timestamp of broadcasting frame, the timestamp of the last target broadcasting frame obtained of decoding and the described span value that obtain according to current decoding judge whether the broadcasting frame that current decoding obtains is that target plays frame.
Wherein, described broadcasting frame is the picture to obtaining after video code flow decoding, and the picture after each frame decoding all carries timestamp, and described timestamp is used to indicate the broadcasting moment of picture in video code flow of its correspondence; It is from described broadcasting frame, choose the picture to be played obtained that described target plays frame.
If the broadcasting frame that 104 described current decodings obtain is target play frame, then the broadcasting frame described current decoding obtained is play frame as target and is carried out reception and buffer memory.
Wherein, when judging that the broadcasting frame that described current decoding obtains is target broadcasting frame by step 103, receive and target broadcasting frame described in buffer memory.When judging that the broadcasting frame that described current decoding obtains is not target broadcasting frame by step 103, then abandon the target broadcasting frame that described current decoding obtains.
What deserves to be explained is, while carrying out step 101-104, also carry out following steps: play frame according to the target of buffer memory and carry out video playback, by this step, achieve F.F. or the fast reverse play of video playback.
As shown in Figure 2, further, while realization carries out the Play Control of F.F. or rewind to video, also realize carrying out slow Play Control of closely or slowly moving back to video, the described broadcasting frame obtained according to current decoding timestamp, on once the decode target that obtains play the timestamp of frame and described span value judges whether the broadcasting frame that current decoding obtains is, after target plays frame, comprising:
If the broadcasting frame that 105 described current decodings obtain is target play frame, according to the display number of times of the timestamp of broadcasting frame, the timestamp of the target broadcasting frame of last time reception and the target broadcasting frame of the described last time reception of described span value acquisition that current decoding obtains.
The described target according to buffer memory is play frame and is carried out video playback, comprising:
106, the display number of times playing frame corresponding according to target broadcasting frame and each target of buffer memory carries out video playback.
As shown in Figure 2, further, because video code flow decoding speed is faster than video playout speed, while carrying out the broadcasting of current goal broadcasting frame, buffer memory plays frame by multiple target to be played, when a new control signal is received, can carry out Play Control switching.But before Play Control switches, need that the target multiple to be played of buffer memory is play frame finish, the video playback of carrying out according to new control signal could be realized, in order to solve the problem of Play Control handoff delay, play frame at the described broadcasting frame described current decoding obtained as target carry out reception and before buffer memory, also comprise:
107, judge whether total display number of times of the target broadcasting frame of buffer memory is less than the Second Threshold pre-set.If total display number of times that the target of buffer memory plays frame is less than the Second Threshold pre-set, then perform step 108; If total display number of times that the target of buffer memory plays frame is more than or equal to the Second Threshold pre-set, then perform step 109.
Wherein, described total display number of times is the summation of the display number of times of multiple targets broadcasting frames of buffer memory.If the state that current video is play is F.F. or rewind, the display number of times that each target broadcasting frame of buffer memory is is 1, and described total display number of times is also the frame number of the target broadcasting frame of buffer memory; If current video broadcast state slow-motion or move back slowly, each target of buffer memory plays frame all to be needed repeatedly to show, and described total display number of times is the display number of times sum that the target of each buffer memory plays frame.In the present embodiment, described Second Threshold can pre-set according to described video code flow decoding speed and current video broadcasting speed, also can pre-set based on experience value, be not construed as limiting herein.
Accordingly, the described broadcasting frame that described current decoding is obtained as target play frame carry out receptions also buffer memory comprise:
108, the broadcasting frame described current decoding obtained is play frame as target and is carried out reception and buffer memory.
109, described target wouldn't be received play frame and stop decoding to video code flow, until total display number of times that the target of buffer memory plays frame be decremented to be less than described in pre-set threshold value time the broadcasting frame that more described current decoding obtained play frame as target and carry out receptions also buffer memory.
The method of the control video playback that the embodiment of the present invention provides, pass through reception control signal, described control signal carries play frame rate corresponding to video broadcasting condition, span value is generated according to display frame rate and described control signal, described display frame rate is the play frame rate that video normal playing status is corresponding, described span value is the time interval between adjacent display frame, described display frame is the frame picture play, according to the timestamp of the broadcasting frame that current decoding obtains, the timestamp of the last target broadcasting frame obtained of decoding and described span value judge whether the broadcasting frame that current decoding obtains is that target plays frame, if the broadcasting frame that described current decoding obtains is target play frame, the broadcasting frame then described current decoding obtained is play frame as target and is carried out reception and buffer memory, video carried out compared with the Play Control of rewind or F.F. with prior art by the unit that is spaced apart with adjacent key frame, by obtaining play frame rate, unit to carry out F.F. or rewind Play Control to video can be spaced apart according to arbitrary frame.
Embodiment two
The embodiment of the present invention provides a kind of method of Play Control, as shown in Figure 3, comprising:
201, reception control signal, described control signal carries play frame rate corresponding to video broadcasting condition.
Wherein, step 201 is identical with described in step 101 in embodiment one, repeats no more herein.
202, span value is generated according to display frame rate and described control signal.
Wherein, described display frame rate is the play frame rate that video normal playing status is corresponding, described span value be carry out every frame picture in the video play according to described control signal timestamp between the time interval.The computing formula of span value is: span value=play frame rate/display frame rate × 1/ display frame rate.Described display frame rate is the play frame rate that video normal playing status is corresponding, described span value be described control signal carry out every frame picture in the video play timestamp between the time interval.Display frame rate be generally be greater than 0 number.When the absolute value of the play frame rate that control signal is carried is greater than display frame rate, video playback is F.F. or fast-rewinding state; When the absolute value of the play frame rate that control signal is carried is less than display frame rate, video playback is slow-motion or moves back state slowly; When the absolute value of the play frame rate that control signal is carried equals display frame rate, video playback is the advance of normal speed or switches broadcasting.Forward or the reverse play of video normal speed are play in units of frame, and each frame represents a width picture.The play frame rate of carrying due to control signal be one can be greater than 0 or be less than 0 or equal 0 Arbitrary Digit, so by the known span value of the computing formula of span value be also one can be greater than 0 or be less than 0 or equal 0 Arbitrary Digit, the occurrence of described span value can be determined jointly by play frame rate and display frame rate.Inversely, the speed of video playback is faster for the speed of video playback and the absolute value of span value, and the absolute value of span value is less, and the speed of video playback is slower, and the absolute value of span value is larger.When video fast forward or fast reverse play, owing to not being that each frame picture is all shown, so when F.F. or rewind, in the time interval between the timestamp of the often adjacent two frame pictures shown under normal speed forward between the timestamp of the often adjacent two frame pictures of display, now the absolute value of span value is greater than the absolute value of the span value of normal speed forward.Described timestamp is used to indicate the broadcasting moment of picture in video code flow of its correspondence, and under the state of video normal play, the image frame that timestamp is large just can show after the image frame display that timestamp is little.When video is the state of putting slowly or moving back slowly, each frame picture is all shown, and the time interval between the timestamp that the time interval between the timestamp of the often adjacent two frame pictures of display is less than the often adjacent two frame image frames of the display of normal speed forward, so the absolute value of span value when the absolute value of span value is less than normal speed forward.
It should be noted that, for different broadcast states, the display number of times of each image frame may be different.For moving back slowly or the broadcast state of slow-motion, a frame picture needs this displays many.So the adjacent two frame pictures of display may be twice of same frame picture or repeatedly show.
Such as, play frame rate is 30 frames/second, and display frame rate is 30 frames/second, then video broadcasting condition is the forward play of normal speed, and span value is 30/30 × 1/30=33 millisecond; When play frame rate is-30 frames/second, display frame rate is 30 frames/second, then video broadcasting condition is the reverse play of normal speed, and span value is-30/30 × 1/30=-33 millisecond; When play frame rate is 60 frames/second, display frame rate is 30 frames/second, then video broadcasting condition is F.F. state, and span value is 60/30 × 1/30=66 millisecond; When play frame rate is-60 frames/second, display frame rate is 30 frames/second, then video broadcasting condition is fast-rewinding state, and span value is-60/30 × 1/30=-66 millisecond; When play frame rate is 15 frames/second, display frame rate is 30 frames/second, then video broadcasting condition is slow-motion state, and span value is-15/30 × 1/30=-16.5 millisecond; When play frame rate is-150 frames/second, display frame rate is 30 frames/second, then video broadcasting condition is for move back state slowly, and span value is-15/30 × 1/30=-16.5 millisecond.
203, the timestamp of frame is play and described span value obtains scale value according to the decode target that obtains of last time.
Wherein, scale value can be target play timestamp and the described span value of frame with.It is the image frame preparing to play that target plays frame.Scale value is the timestamp of the broadcasting of the target next time frame of expection.Picture after each frame decoding all carries timestamp, and during the forward play of normal speed, the timestamp of the frame picture first play is less than the timestamp of a frame picture of rear broadcasting, shows successively the picture of each frame decoding according to timestamp.When broadcast state be F.F. or slow-motion state time, then described scale value is greater than the timestamp that the last target that obtains of decoding plays frame; When broadcast state be rewind or move back state slowly time, then described scale value is less than the timestamp that the last target that obtains of decoding plays frame.
Such as, as shown in Figure 4, the timestamp of the target broadcasting frame of last decoding is 40 milliseconds, play frame rate is 60 frames/second, and display frame rate is 30 frames/second, and video broadcasting condition is F.F. state, span value is 60/30 × 1/30=66 millisecond, scale value is 66 milliseconds+40 milliseconds=106 milliseconds, and what the next time of namely expecting needed the target frame play is timestamp is 106 milliseconds, illustrates that the timestamp of the frame next time play is after the upper frame once play.The timestamp of the target broadcasting frame also can lastly decoded is 40 milliseconds, play frame rate is-15 frames/second, display frame rate is 30 frames/second, video broadcasting condition is for move back state slowly, span value is-15/30 × 1/30=-16.5 millisecond, scale value is-16.5 milliseconds+40 milliseconds=23.5 milliseconds, and the next time of namely expecting needs the timestamp of the target frame play to be 23.5 milliseconds, illustrates that the timestamp of the frame next time play is before the upper frame once play.
204, judge in the scope whether timestamp of the broadcasting frame that described current decoding obtains falls between the timestamp of the target broadcasting frame that described last time decoding obtains and described scale value.If the timestamp of the broadcasting frame that current decoding obtains falls in the scope between the timestamp of the target broadcasting frame that described last time decoding obtains and described scale value, then perform step 210; If the timestamp of the broadcasting frame that current decoding obtains does not fall in the scope between the timestamp of the target broadcasting frame that described last time decoding obtains and described scale value, then perform step 206.
Wherein, when broadcast state be F.F. or rewind time, the timestamp of the broadcasting frame that current decoding obtains is more than or equal to described scale value, then the timestamp of broadcasting frame that described current decoding obtains does not fall into the target obtained of decoding of described last time and plays in the scope between the timestamp of frame and described scale value; The timestamp of the broadcasting frame that current decoding obtains is less than described scale value, then the timestamp of broadcasting frame that described current decoding obtains falls into the target obtained of decoding of described last time and plays in the scope between the timestamp of frame and described scale value.When broadcast state be slow-motion or move back slowly time, the timestamp of the broadcasting frame that current decoding obtains is less than or equal to described scale value, then the timestamp of broadcasting frame that described current decoding obtains does not fall into the target obtained of decoding of described last time and plays in the scope between the timestamp of frame and described scale value; The timestamp of the broadcasting frame that current decoding obtains is greater than described scale value, then the timestamp of broadcasting frame that described current decoding obtains falls into the target obtained of decoding of described last time and plays in the scope between the timestamp of frame and described scale value.
Further, consider that the timestamp of the frame obtained of decoding exists fluctuation, certain fault-tolerant in order to allow, if the timestamp of the broadcasting frame obtained in described current decoding fall into described on once decode the target that obtains play scope between the timestamp of frame and described scale value outer after and before abandoning the broadcasting frame that described current decoding obtains, the embodiment of the present invention also comprises:
205, judge whether the absolute value in the time interval between the timestamp of the broadcasting frame that current decoding obtains and scale value is less than the first threshold pre-set.If the absolute value in the time interval between the timestamp of the broadcasting frame that current decoding obtains and scale value is less than the first threshold pre-set, then perform step 206; If the absolute value in the time interval between the timestamp of the broadcasting frame that current decoding obtains and scale value is more than or equal to the first threshold pre-set, then perform step 209.
Wherein, described first threshold is a definite value, can be set to the number that is less than the absolute value of span value, and the concrete size of first threshold can need to arrange according to precision.Such as, span value is 30 milliseconds, can arrange that accuracy value is span value 1/10th, and namely 3 milliseconds.The embodiment of the present invention does not limit this.By step 205, the judgement of target being play to frame achieves certain fault tolerance, avoids the timestamp due to the frame obtained of decoding to there is fluctuation and causes target to play the loss of frame.
It should be noted that, step 205 is optional step.
206, the timestamp of broadcasting frame, the timestamp of the last target broadcasting frame received and the described span value that obtain according to current decoding obtain the display number of times that the described last target received plays frame.
It should be noted that, if do not consider the Play Control that video is carried out to slow-motion or moves back slowly, step 206 can not be performed, do not need the display number of times calculating the target broadcasting frame that the described last time receives, carry out the forward of F.F. or rewind or normal speed or reverse broadcasting to video, the display number of times giving tacit consent to each target to be played broadcasting frame is 1 time.
207, judge whether total display number of times of the target broadcasting frame of buffer memory is less than the Second Threshold pre-set.If total display number of times that the target of buffer memory plays frame is less than the Second Threshold pre-set, then perform step 208; If the Second Threshold pre-set described in total display number of times of the target broadcasting frame of buffer memory is more than or equal to, then perform step 209.
Wherein, described in the Second Threshold that pre-sets can be a positive integer, total display number of times that the target of described buffer memory plays frame can be play the display number of times sum that the display number of times of frame and target to be played play frame and obtain by the target shown.The forward of normal speed or reverse and F.F. or rewind video playback, the display number of times of every frame picture is once all; Slow-motion or when moving back slowly, the display number of times of every frame picture is greater than once, namely adjacent display frame may be the repeatedly display of same picture frame.The described Second Threshold pre-set can be a positive integer.The concrete value of Second Threshold can be selected the requirement of handover delay according to user.If less demanding to handover delay, then described Second Threshold can be a larger positive integer, if require high to handover delay, then described Second Threshold can be a less positive integer.The embodiment of the present invention does not limit this.
208, the broadcasting frame described current decoding obtained is play frame as target and is carried out reception and buffer memory.
Wherein, when total display number of times that described target plays frame is less than the Second Threshold pre-set, illustrate that buffer memory also has living space, the broadcasting frame that current decoding can be obtained is play frame as target and is received and store, and notifies that decoder module continues decoding.
209, described target wouldn't be received play frame and stop decoding to video code flow, until total display number of times that the target of buffer memory plays frame be decremented to be less than described in pre-set Second Threshold time the broadcasting frame that more described current decoding obtained play frame as target and carry out receptions also buffer memory.
Wherein, when total display number of times that described target plays frame is more than or equal to the Second Threshold pre-set, illustrate that buffer memory does not have space, described target wouldn't be received and play frame, and notify that decoder module wouldn't be decoded, resend the described target that wouldn't receive after a while and play frame.
Such as, as shown in Figure 5, Second Threshold is 3, represent and can deposit the target broadcasting frame that total display number of times is 3 in buffer memory, buffer memory buffer memory 1 frame target plays frame 1, the 1 display number of times that this target plays frame is 2 times, now, supposing that the target of buffer memory plays total display number of times of frame has been 1 time, when another target broadcasting frame 2 will enter buffer memory, through judging, total display number of times is less than Second Threshold 31 time, therefore receive another target broadcasting frame 2, and the display number of times calculating target broadcasting last time frame is 2, now, total display number of times is 2+1=3, therefore when there being other targets to play frame 3 when entering buffer memory again, wouldn't receive, until target makes always to show number of times and subtracts 1 and become 2 in buffer memory after playing frame display, judge the magnitude relationship of total display number of times and Second Threshold again, always shown number of times 2 and be less than Second Threshold 3, therefore the target do not received temporarily before receiving plays frame 3.
It should be noted that, target is play frame and is often shown once, and the display number of times that shown target plays frame reduces once.It is the display number of times sum that the target of current broadcasting plays that target to be played in the display number of times of frame and buffer memory plays frame that total target plays frame.Often show once so play frame when target, total display number of times that the target in buffer memory plays frame reduces once.
Also it should be noted that, because broadcasting speed is less than decoding speed, existed after playing control state and switching mainly with the state decode before switching but the frame also do not play switch by Play Control state before state plays, cause Play Control switch speed slow, so introduce described Second Threshold, play comparing of total display number of times of frame by Second Threshold with the target of buffer memory, control the speed of decoding, improve the speed that Play Control switches.
210, the broadcasting frame that described current decoding obtains is not that target plays frame, abandons the broadcasting frame that described current decoding obtains.
Wherein, the broadcasting frame obtained when described current decoding is not that to play frame be abandon the broadcasting frame that described current decoding obtains to target, and notifies that decoder module continues decode and transmit next frame.
211, the display number of times playing frame corresponding according to target broadcasting frame and each target of buffer memory carries out video playback.
Wherein, the timestamp that the described target stored in buffer memory plays the storage order and target broadcasting frame that frame can play frame according to target shows successively, to being once that above target plays frame with display number of times, the display number of times playing frame according to the time interval corresponding to the absolute value of span value and described target shows described target broadcasting frame.Further, when often showing a target broadcasting frame, target is play display number of times corresponding to frame and is reduced once.
The method of the control video playback that the embodiment of the present invention provides, pass through reception control signal, described control signal carries play frame rate corresponding to video broadcasting condition, span value is generated according to display frame rate and described control signal, described display frame rate is the play frame rate that video normal playing status is corresponding, described span value is the time interval between adjacent display frame, described display frame is the frame picture play, according to the timestamp of the broadcasting frame that current decoding obtains, the timestamp of the last target broadcasting frame obtained of decoding and described span value judge whether the broadcasting frame that current decoding obtains is that target plays frame, if the broadcasting frame that described current decoding obtains is target play frame, the broadcasting frame then described current decoding obtained is play frame as target and is carried out reception and buffer memory, video carried out compared with the Play Control of rewind or F.F. with prior art by the unit that is spaced apart with adjacent key frame, by obtaining play frame rate, unit to carry out F.F. or rewind Play Control to video can be spaced apart according to arbitrary frame.
Further, by introducing Second Threshold, control decoding speed, make to only have after playing control state and switching minority with the state decode before switching but the frame do not play switch by Play Control state before state plays, accelerate the speed that Play Control switches.
Also it should be noted that, by introducing first threshold, allowing the timestamp of decoded frame within the specific limits fault-tolerant, making the method more closing to reality situation of the embodiment of the present invention.
Embodiment three
The embodiment of the present invention provides a kind of device controlling video playback, as shown in Figure 6, comprising: receiving element 31, first acquiring unit 32, first judging unit 33, buffer unit 34.
Receiving element 31, for reception control signal, described control signal carries play frame rate corresponding to video broadcasting condition, and described control signal is transferred to the first acquiring unit 32.
First acquiring unit 32, described control signal for transmitting according to display frame rate and described receiving element 31 generates span value, and described span value is transferred to the first judging unit, described display frame rate is the play frame rate that video normal playing status is corresponding, described span value be carry out every frame picture in the video play according to described control signal timestamp between the time interval.
First judging unit 33, the described span value that the timestamp of broadcasting frame, the timestamp of the last target broadcasting frame obtained of decoding and described first acquiring unit 32 for obtaining according to current decoding transmit judges whether the broadcasting frame that current decoding obtains is that target plays frame.
Buffer unit 34, during for being target broadcasting frame when the broadcasting frame that described current decoding obtains, the broadcasting frame described current decoding obtained is play frame as target and is carried out reception and buffer memory.
Further, as shown in Figure 7, described first judging unit 33 specifically comprises: the first acquisition module 331, first judge module 332.
First acquisition module 331, timestamp and the described span value of the target obtained for decoding according to last time broadcasting frame obtain scale value.
First judge module 332, when the target obtained for not falling into described last time decoding when the timestamp of the broadcasting frame that current decoding obtains is play in the scope between the timestamp of frame and described scale value, the broadcasting frame that described current decoding obtains is that target plays frame.
Further, as shown in Figure 7, described first judging unit 33 also comprises: the second judge module 333.
Second judge module 333, for fall into when the timestamp of the broadcasting frame that current decoding obtains the described last time to decode in scope that the target that obtains plays between the timestamp of frame and described scale value and the absolute value in time interval between the timestamp of broadcasting frame that obtains of current decoding and scale value is less than the first threshold pre-set time, the broadcasting frame that described current decoding obtains is that target plays frame.
Further, as shown in Figure 7, described device also comprises: broadcast unit 35.
Broadcast unit 35, carries out video playback for playing frame according to the target of buffer memory.
Further, as shown in Figure 7, described device also comprises: second acquisition unit 36.
Second acquisition unit 36, for the broadcasting frame obtained according to current decoding timestamp, on once the decode target that obtains play the timestamp of frame and described span value judges whether the broadcasting frame that current decoding obtains is after target plays frame, if the broadcasting frame that described current decoding obtains is target play frame, according to the display number of times of the timestamp of broadcasting frame, the timestamp of the target broadcasting frame of last time reception and the target broadcasting frame of the described last time reception of described span value acquisition that current decoding obtains.
Accordingly, described broadcast unit 35 specifically comprises: playing module 351.
Playing module 351, carries out video playback for the display number of times playing frame corresponding according to target broadcasting frame and each target of buffer memory.
Further, as shown in Figure 7, described device also comprises: the second judging unit 37.
Second judging unit 37, receptions is carried out also before buffer memory for play frame as target at the described broadcasting frame described current decoding obtained, judge whether total display number of times of the target broadcasting frame of buffer memory is less than the Second Threshold pre-set, total display number of times of the target broadcasting frame of described buffer memory is the display number of times sum of each target broadcasting frame of buffer memory.
Accordingly, described buffer unit 34, specifically comprises:
3rd judge module 341, for when total display number of times that the target of buffer memory plays frame is less than the Second Threshold pre-set, the broadcasting frame described current decoding obtained is play frame as target and is carried out reception and buffer memory.
4th judge module 342, the Second Threshold pre-set described in total display number of times for playing frame when the target of buffer memory is more than or equal to, then wouldn't receive described target play frame and suspend the decoding being video code flow, until the target of buffer memory play total display number of times of frame be decremented to be less than described in pre-set Second Threshold time the broadcasting frame that more described current decoding obtained play frame as target and carry out receptions also buffer memory.
It should be noted that, the content that in the embodiment of the present invention, the specific descriptions of part steps can be corresponding in reference example one or embodiment two, the embodiment of the present invention will not repeat here one by one.
The device of the control video playback that the embodiment of the present invention provides, pass through reception control signal, described control signal carries play frame rate corresponding to video broadcasting condition, span value is generated according to display frame rate and described control signal, described display frame rate is the play frame rate that video normal playing status is corresponding, described span value is the time interval between adjacent display frame, described display frame is the frame picture play, according to the timestamp of the broadcasting frame that current decoding obtains, the timestamp of the last target broadcasting frame obtained of decoding and described span value judge whether the broadcasting frame that current decoding obtains is that target plays frame, if the broadcasting frame that described current decoding obtains is target play frame, the broadcasting frame then described current decoding obtained is play frame as target and is carried out reception and buffer memory, video carried out compared with the Play Control of rewind or F.F. with prior art by the unit that is spaced apart with adjacent key frame, by obtaining play frame rate, unit to carry out F.F. or rewind Play Control to video can be spaced apart according to arbitrary frame.
Further, by introducing Second Threshold, control decoding speed, make to only have after playing control state and switching minority with the state decode before switching but the frame do not play switch by Play Control state before state plays, accelerate the speed that Play Control switches.
Be understandable that, by introducing first threshold, allow the timestamp of decoded frame within the specific limits fault-tolerant, making the method more closing to reality situation of the embodiment of the present invention.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add required common hardware by software and realize, and can certainly pass through hardware, but in a lot of situation, the former is better execution mode.Based on such understanding, technical scheme 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 is stored in the storage medium that can read, as the floppy disk of computer, hard disk or CD etc., comprise some instructions and perform method described in each embodiment of the present invention in order to make a computer equipment (can be personal computer, server, or the network equipment etc.).
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (10)
1. control a method for video playback, it is characterized in that, comprising:
Reception control signal, described control signal carries play frame rate corresponding to video broadcasting condition;
Span value is generated according to display frame rate and described control signal, described display frame rate is the play frame rate that video normal playing status is corresponding, described span value be carry out every frame picture in the video play according to described control signal timestamp between the time interval, the timestamp of a frame picture is used to indicate the broadcasting moment of this frame picture in video code flow;
Play the timestamp of frame and described span value obtains scale value according to the decode target that obtains of last time, described scale value be the target timestamp of playing frame with described span value and, described scale value is the timestamp of the broadcasting of the target next time frame of expection;
If the timestamp of the broadcasting frame that current decoding obtains does not fall in the scope between the timestamp of the target broadcasting frame that described last time decoding obtains and described scale value, then the broadcasting frame that described current decoding obtains is that target plays frame;
If the broadcasting frame that described current decoding obtains is target play frame, then the broadcasting frame described current decoding obtained is play frame as target and is carried out reception and buffer memory.
2. method according to claim 1, it is characterized in that, the described timestamp of broadcasting frame, the timestamp of the last target broadcasting frame obtained of decoding and the described span value obtained according to current decoding judges whether the broadcasting frame that current decoding obtains is that target plays frame, also comprises:
If the timestamp of the broadcasting frame that current decoding obtains falls into the described last time and to decode in scope that the target that obtains plays between the timestamp of frame and described scale value and the absolute value in time interval between the timestamp of broadcasting frame that obtains of current decoding and scale value is less than the first threshold pre-set, then the broadcasting frame that described current decoding obtains is that target plays frame.
3. method according to claim 1, is characterized in that, also comprises:
Play frame according to the target of buffer memory and carry out video playback.
4. method according to claim 3, it is characterized in that, the described broadcasting frame obtained according to current decoding timestamp, on once the decode target that obtains play the timestamp of frame and described span value judges whether the broadcasting frame that current decoding obtains is, after target plays frame, also comprise:
If the broadcasting frame that described current decoding obtains is target play frame, according to the display number of times of the timestamp of broadcasting frame, the timestamp of the target broadcasting frame of last time reception and the target broadcasting frame of the described last time reception of described span value acquisition that current decoding obtains;
The described target according to buffer memory is play frame and is carried out video playback, comprising:
Video playback is carried out according to the display number of times that target broadcasting frame and each target of buffer memory play frame corresponding.
5. method according to claim 4, is characterized in that, plays frame carry out reception and before buffer memory, also comprise at the described broadcasting frame described current decoding obtained as target:
Judge whether total display number of times of the target broadcasting frame of buffer memory is less than the Second Threshold pre-set, total display number of times of the target broadcasting frame of described buffer memory is the display number of times sum of each target broadcasting frame of buffer memory;
The described broadcasting frame described current decoding obtained is play frame as target and is carried out reception and buffer memory, comprising:
If total display number of times that the target of buffer memory plays frame is less than the Second Threshold pre-set, then the broadcasting frame described current decoding obtained is play frame as target and is carried out reception and buffer memory;
The Second Threshold pre-set described in if total display number of times of the target broadcasting frame of buffer memory is more than or equal to, then wouldn't receive described target play frame and stop decoding to video code flow, until total display number of times that the target of buffer memory plays frame be decremented to be less than described in pre-set Second Threshold time the broadcasting frame that more described current decoding obtained play frame as target and carry out receptions also buffer memory.
6. control a device for video playback, it is characterized in that, comprising:
Receiving element, for reception control signal, described control signal carries play frame rate corresponding to video broadcasting condition, and described control signal is transferred to the first acquiring unit;
First acquiring unit, for generating span value according to the described control signal of display frame rate and the transmission of described receiving element, and described span value is transferred to the first judging unit, described display frame rate is the play frame rate that video normal playing status is corresponding, described span value be carry out every frame picture in the video play according to described control signal timestamp between the time interval, the timestamp of a frame picture is used to indicate the broadcasting moment of this frame picture in video code flow;
First judging unit, timestamp and the described span value of the target broadcasting frame obtained for decoding according to the last time obtain scale value, described scale value be target play timestamp and the described span value of frame and, described scale value is the timestamp of the broadcasting of the target next time frame of expection; When the timestamp of the broadcasting frame that current decoding obtains does not fall in the scope between the timestamp of the target broadcasting frame that described last time decoding obtains and described scale value, the broadcasting frame that described current decoding obtains is that target plays frame;
Buffer unit, during for being target broadcasting frame when the broadcasting frame that described current decoding obtains, the broadcasting frame described current decoding obtained is play frame as target and is carried out reception and buffer memory.
7. device according to claim 6, is characterized in that, described first judging unit, also comprises:
Second judge module, for fall into when the timestamp of the broadcasting frame that current decoding obtains the described last time to decode in scope that the target that obtains plays between the timestamp of frame and described scale value and the absolute value in time interval between the timestamp of broadcasting frame that obtains of current decoding and scale value is less than the first threshold pre-set time, the broadcasting frame that described current decoding obtains is that target plays frame.
8. device according to claim 6, is characterized in that, also comprises:
Broadcast unit, carries out video playback for playing frame according to the target of buffer memory.
9. device according to claim 8, is characterized in that, also comprises:
Second acquisition unit, for the described broadcasting frame obtained according to current decoding timestamp, on once the decode target that obtains play the timestamp of frame and described span value judges whether the broadcasting frame that current decoding obtains is after target plays frame, if the broadcasting frame that described current decoding obtains is target play frame, according to the display number of times of the timestamp of broadcasting frame, the timestamp of the target broadcasting frame of last time reception and the target broadcasting frame of the described last time reception of described span value acquisition that current decoding obtains;
Described broadcast unit, specifically comprises:
Playing module, carries out video playback for the display number of times playing frame corresponding according to target broadcasting frame and each target of buffer memory.
10. device according to claim 9, is characterized in that, also comprises:
Second judging unit, receptions is carried out also before buffer memory for play frame as target at the described broadcasting frame described current decoding obtained, judge whether total display number of times of the target broadcasting frame of buffer memory is less than the Second Threshold pre-set, total display number of times of the target broadcasting frame of described buffer memory is the display number of times sum of each target broadcasting frame of buffer memory;
Described buffer unit, specifically comprises:
3rd judge module, for when total display number of times that the target of buffer memory plays frame is less than the Second Threshold pre-set, the broadcasting frame described current decoding obtained is play frame as target and is carried out reception and buffer memory;
4th judge module, the Second Threshold pre-set described in total display number of times for playing frame when the target of buffer memory is more than or equal to, then wouldn't receive described target play frame and stop decoding to video code flow, until total display number of times that the target of buffer memory plays frame be decremented to be less than described in pre-set Second Threshold time the broadcasting frame that more described current decoding obtained play frame as target and carry out receptions also buffer memory.
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| CN103970272B (en) * | 2014-04-10 | 2018-04-27 | 北京智谷睿拓技术服务有限公司 | Exchange method, device and user equipment |
| CN104394344B (en) * | 2014-11-26 | 2018-02-02 | 北京智谷睿拓技术服务有限公司 | Video frame selecting method and equipment |
| CN105898626A (en) * | 2015-12-11 | 2016-08-24 | 乐视网信息技术（北京）股份有限公司 | Rewound video generating method and device and play device |
| CN106162235B (en) * | 2016-08-17 | 2018-06-01 | 北京百度网讯科技有限公司 | For the method and apparatus of Switch Video stream |
| CN106507187A (en) * | 2016-09-22 | 2017-03-15 | 深圳市金立通信设备有限公司 | A kind of video broadcasting method and terminal |
| CN108810656B (en) * | 2018-06-12 | 2021-10-26 | 深圳国微视安科技有限公司 | Real-time live broadcast TS (transport stream) jitter removal processing method and processing system |
| CN109168083B (en) * | 2018-10-23 | 2021-05-28 | 海信视像科技股份有限公司 | Streaming media real-time playing method and device |
| CN111263211B (en) * | 2018-12-03 | 2022-02-08 | 深圳市炜博科技有限公司 | Method for caching video data and terminal equipment |
| CN113050906B (en) | 2019-12-26 | 2024-05-07 | 深圳市万普拉斯科技有限公司 | Frame rate adjustment method and device for display screen, terminal and storage medium |
| CN114302064B (en) * | 2022-01-27 | 2024-01-26 | 北京同尔科技有限公司 | Video processing method, device and system based on receiving card |
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