CN1705365A - Fast forwarding method for video signal - Google Patents
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- CN1705365A CN1705365A CN 200410047652 CN200410047652A CN1705365A CN 1705365 A CN1705365 A CN 1705365A CN 200410047652 CN200410047652 CN 200410047652 CN 200410047652 A CN200410047652 A CN 200410047652A CN 1705365 A CN1705365 A CN 1705365A
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Abstract
This invention refers to a fast playing method for audio-video signal using time scaling algorithm, which contains using range restriction and slope computation inter-coefficient to compressing audio-video signal, said invention compresses audio-video signal into one signal unit and keeps fine sound quality.
Description
Technical field
The present invention relates to one service time the convergent-divergent algorithm video-audio signal fast-forward play method, calculate video-audio signal quality when improving fast-forward play by audiorange restriction and waveform slope.
Background technology
General user is when the audiovisual materials that use as CD, VCD, DVD or cassette tape etc., in the video-audio signal broadcast needs that advance or reverse are arranged often, especially to repeat to listen to or watch certain multi-media segment, if need to arrive a certain precalculated position fast and, there is fast/slow to advance (fast/slow forward) or the needs of fast/slow reversing (fast/slow reverse) especially to play at a slow speed.Therefore, known technology development several settling modes at the demand, as sampling frequency (samplingfrequency) and time-scaling methods such as (time scale).
The notion of time-scaling can be consulted Fig. 1 and illustrated in the known technology.Wherein, an input video-audio signal M is arranged, and divides into a plurality of windowing (window), as first window 11, second window 12, three-way window 13 etc.; This windows and is the least unit in the voice signal, the action of the repetition of windowing under a predefined compression ratio.Output video-audio signal N as shown, first of input video-audio signal M is windowed 11 and second to window and 12 a repeating signal position P1 is arranged, second window 12 and three-way window 13 a repeating signal position P2 is arranged, by the compression step of each adjacent repetition of windowing, reach the purpose of time compression and video-audio signal F.F..
Another embodiment of the time-scaling method of known technology sees also shown in Fig. 2 A to Fig. 2 F, is the schematic diagram that concerns of sound wave and time shaft.One minimum wavelength Lmin and maximum wavelength Lmax are arranged among Fig. 2 A, be increased to maximum wavelength Lmax by minimum wavelength Lmin, draw a basic cycle Lp, shown in Fig. 2 B by a similitude (similarity) detecting step.Should original sound wave cutting be the first waveform A and second waveform B according to this basic cycle Lp again, shown in Fig. 2 C.And by Fig. 2 C as can be known, the first waveform A is the waveform (Fig. 2 D) that a slope descends, and second waveform B is the waveform (Fig. 2 E) that a slope rises.The first waveform A and the second waveform B addition are got the hybrid waveform shown in Fig. 2 F (A+B),, obtain the result who obtains by the time-scaling modification method to replace original waveform A, B.
See also Fig. 3 A again, be U.S. Patent No. 6,424, the sampling frequency method data flow diagram shown in No. 789.This known technology is the method that changes fast commentaries on classics of image data or slow-speed sampling according to presentation content, only discusses with regard to video-audio signal data screening method wherein at this.Video-audio signal data flow 30 as shown in the figure is comprising two groups of video-audio signal fragments (shot): the first video-audio signal fragment 31 and the second video-audio signal fragment 32; And each video-audio signal fragment further is divided into a plurality of video-audio signal frames (frame), as the video-audio signal frame F1 in the first video-audio signal fragment 31, F2, F3, F4 ..., Fn, with F1, F2 in the second video-audio signal fragment 32, F3 ..., Fm.If will then need to add according to contiguous video-audio signal frame in addition or duplicate extra video-audio signal frame with these video-audio signal data with slow play, the data flow of broadcast is elongated; If will play fast, then need the video-audio signal frame of choosing to be left out, to shorten video-audio signal data flow length according to a selection principle (this principle does not describe in detail at this).As shown, F2, F4 in the first video-audio signal fragment 31 are abandoned, and F2, the Fm ' in the second video-audio signal fragment 32 cast out, advance or reverse the purpose of playing to reach the video-audio signal fast/slow.
Fig. 3 B is the method flow diagram of known technology shown in Fig. 3 A.When video-audio signal begins to play (step 301); Audio-visual devices promptly receives the video-audio signal data flow (stream) (step 302) from broadcast source; By the processor in the equipment,, data flow is distinguished into a plurality of fragments (shot) (step 303) as digital signal processor (DSP); Control the grade of decision rapid change again by the user, as (steps 304) such as the speed of fast commentaries on classics/slow-speed, qualities; According to the grade that the user determined each video-audio signal fragment is classified again, make it to be divided into a plurality of different video-audio signal frames (frame) (step 305); Use the described suitable sampling algorithm of this known technology (sampling algorithm), wherein some video-audio signal frame abandons or duplicates, thereby reaches the purpose (step 306) of fast commentaries on classics or slow play; Judge whether again to have handled to last fragment (step 307); If not, expression still has the video-audio signal fragment to be untreated, and skips to next fragment (step 308) again, and proceeds according to grade each fragment to be categorized into different steps (step 305) such as video-audio signal frame; If handle to last video-audio signal fragment, then each is screened the video-audio signal fragment reorganization that comprises a plurality of video-audio signal frames of getting off, and becoming a revised video-audio signal data flow (step 309), the video-audio signal data flow of this new correction then is the video-audio signal data of required fast commentaries on classics of user or slow play.
Reach fast commentaries on classics advances or reverse the purpose of broadcast but first embodiment in the above-mentioned known technology utilizes time-scaling compression (time-scalecompress) technology; But owing to when looking for similitude, need a large amount of computings, get fixed point, then can cause the discontinuous problem of video-audio signal data, thereby especially when the quick broadcast of complex tone (multi-tone), sonic boom or noise can occur.And the sampling frequency of second embodiment (sampling frequency) method can cause producing the phenomenon of frequency conversion, and making the sound that plays out is a uncommon sound, can become sharp-pointed usually and the higher sound of audio frequency.Therefore, the present invention is directed to the problem that known technology advances fast or reverses, propose one and develop the video-audio signal fast-forward play method of coming by the time-scaling technology.
Summary of the invention
Main purpose of the present invention is the shortcoming that can produce frequency conversion or sonic boom in the time of will solving known video-audio signal F.F..Therefore, the present invention proposes one and is developed and the time-scaling algorithm (time scaling algorithm) of the video-audio signal fast-forward play of coming by the time-scaling technology, calculates the tonequality of improving fast-forward play by audiorange restriction wherein with waveform slope.
The invention provides a kind of video-audio signal fast-forward play method, this method is developed and an interpolation coefficient algorithm (inter-coefficient) of the video-audio signal fast-forward play of coming by a time zoom technology (time scaling), reach the purpose of compression one video-audio signal data flow, the step of this video-audio signal fast-forward play method includes: a plurality of video-audio signal unit packet are deposited at least one buffer storage; In this buffer storage, set a plurality of index (index); Set a reference point, this reference point is a datum mark (alignment point) of this interpolation coefficient algorithm; Begin the calculation of this interpolation coefficient algorithm by this datum mark address, draw a new compression video-audio signal unit; The index bit of this buffer storage one is moved to next video-audio signal address.And the repetition above-mentioned steps, finishing the compression of video-audio signal, thereby reach the purpose of fast-forward play.
According to above-mentioned conception, wherein, at the beginning of this step begins, this video-audio signal data flow is divided into this a plurality of video-audio signals unit.
According to above-mentioned conception, wherein, include a plurality of sampling video-audio signals in this video-audio signal unit.
According to above-mentioned conception, wherein, these a plurality of video-audio signal unit packet are being deposited in the step of at least one buffer storage, be to divide into groups to deposit in this at least one buffer storage according to required compression ratio or fast-forward play speed.
According to above-mentioned conception, wherein, calculate the step of this reference point, be to begin pointwise by an initial point to calculate, with datum mark as computing next time.
The present invention also provides a kind of video-audio signal fast-forward play method, developed and a next interpolation coefficient algorithm that is used for the video-audio signal fast-forward play by a time zoom technology, in order to compress a video-audio signal data flow, wherein, the step of this video-audio signal fast-forward play method comprises: this video-audio signal data flow is divided into a plurality of video-audio signals unit; Should a plurality of video-audio signal unit packet deposit one first buffer storage and one second buffer storage in; In this first buffer storage and this second buffer storage, set a plurality of index points; Set a reference point, this reference point is a datum mark of this interpolation coefficient algorithm; Begin the calculation of this interpolation coefficient algorithm by this datum mark address, draw a new compression video-audio signal unit; And the index bit of this buffer storage one moved to next video-audio signal address; Repeat above-mentioned steps and compress to finish video-audio signal, thus fast-forward play.
According to above-mentioned conception, wherein, include a plurality of sampling video-audio signals in this video-audio signal unit.
According to above-mentioned conception, wherein, these a plurality of video-audio signal unit packet are being deposited in the step of this first buffer storage and this second buffer storage, be to divide into groups to deposit in this buffer storage according to required compression ratio or fast-forward play speed.
According to above-mentioned conception, wherein, the formula that this datum mark begins pointwise calculating is:
temp[i]+＝Buffer1[index1+i]×Buffer2[index2+j]
Buffer1[wherein] be the address function of this first buffer storage, Buffer2[] be the address function of this second buffer storage, wherein variable i ndex1+i represents the sampling video-audio signal address in the video-audio signal unit of this first buffer storage, and variable i ndex2+j represents the sampling video-audio signal address in the video-audio signal unit of this second buffer storage.
According to above-mentioned conception, wherein, the computing formula of this interpolation coefficient algorithm is:
Buffer1[alignment+i]＝(Buffer2[i]×i
+Buffer1[alignment+i]×unit-Buffer1[alignment+i]×i)/unit
Buffer1[wherein] be the address function of this first buffer storage, Buffer2[] be the address function of this second buffer storage, wherein variable alignment+i represents the datum mark address in the video-audio signal unit of this first buffer storage, and variable i represents to be arranged in the starting point address of the video-audio signal unit of this second buffer storage.
Description of drawings
Figure 1 shows that the schematic diagram of the time-scaling notion of known technology;
Fig. 2 A to Fig. 2 F is depicted as the schematic diagram of sound wave and time shaft relation;
Fig. 3 A is depicted as the schematic diagram of the sampling frequency method data flow of known technology;
Fig. 3 B is depicted as the flow chart of the sampling frequency method of known technology;
Fig. 4 A to Fig. 4 C is depicted as the schematic diagram of the time-scaling method of video-audio signal F.F. of the present invention;
Fig. 5 is the flow chart of steps of video-audio signal fast-forward play method of the present invention.
Wherein, description of reference numerals is as follows:
11 first 12 second 13 three-way windows of windowing of windowing
M input video-audio signal N output video-audio signal P1, P2 repeating signal position
30 video-audio signal data flow, 31 first video-audio signal fragments, 32 second video-audio signal fragments
The A first waveform B second waveform Lmax maximum wavelength
Lmin minimum wavelength Lp basic cycles 40 video-audio signal data flow
41 first buffer storage, 42 second buffer storage
401,402,403,404 video-audio signal unit
411,421 memory region i401, the i402 index point
Embodiment
The present invention is a kind of video-audio signal fast-forward play method, when solving video-audio signal F.F. in the known technology service time convergent-divergent or method such as sampling frequency can produce the shortcoming of too high or sharp-pointed frequency conversion or playing process sonic boom, and a time-scaling algorithm (time scaling algorithm) that improves the video-audio signal fast-forward play that known time-scaling technology develops and come proposed, the audiorange restriction (rangerestriction) by wherein and waveform slope (slope) calculating improve the tonequality of fast-forward play.
See also Fig. 4 A to Fig. 4 C, be depicted as the schematic diagram of the time-scaling method of video-audio signal F.F. of the present invention.
Fig. 4 A is depicted as a video-audio signal data flow (stream) 40, comprising a plurality of video-audio signals unit 401,402,403 and 404 is arranged, each video-audio signal unit further includes a plurality of video-audio signal data flow minimum units, the video-audio signal (sample) of promptly taking a sample.And the purpose of fast-forward play of the present invention is the calculation of each video-audio signal unit wherein being made a time convergent-divergent, makes a plurality of video-audio signals unit (unit) according to required video-audio signal unit of compression ratio boil down to, and can keep good sound quality.For example, if during the twice fast-forward play, being about to two video-audio signal cell compression is a new video-audio signal unit; If during four times of fast-forward play, then in like manner be a new video-audio signal unit with four video-audio signal cell compression.
See also the embodiment of the twice fast-forward play shown in Fig. 4 B, comprising first buffer storage 41 and second buffer storage 42 that disposes in the internal memory arranged.With two video-audio signal unit in the video-audio signal data flow 40 is that a component is criticized and deposited this buffer storage in, deposit the memory region 421 of second buffer storage 42 (as the Buffer1 of formula one) in as video-audio signal unit 401 and 402, and video-audio signal unit 403 and 404 deposits the memory region 411 of first buffer storage 41 (as the Buffer2 of formula one) in.In the embodiment of twice fast-forward play, memory region 411 is the data length of two video-audio signal unit with the data length of memory region 421.
In the buffer storage index of definition address (index), as in first buffer storage 41, setting index point i401, in second buffer storage 42, set index point i402, index value institute mark be sampling video-audio signal (sample) in the video-audio signal unit.
For the phenomenon of frequency conversion or sonic boom does not take place when the fast-forward play, so need find the datum mark of similar waveform earlier when compression, this datum mark is the starting point of interpolation coefficient (inter-coefficient) when algorithm begins computing.See also formula one.
Temp[i] +=Buffer1[index1+i] * Buffer2[index2+j] (formula one)
In this formula, Buffer1[] be the address function of first buffer storage 41, Buffer2[] be the address function of second buffer storage 42, wherein variable i ndex1+i represents sampling video-audio signal (sample) address in the video-audio signal unit of first buffer storage 41, and variable i ndex2+j represents sampling video-audio signal (sample) address in the video-audio signal unit of second buffer storage 42.
In fact, look for the algorithm of interpolation coefficient to be and bring the numerical value of video-audio signal unit 401,402,403,404 into formula one, try to achieve a figure the most similar.With Fig. 4 B is example, and Buffer1 offers video-audio signal unit 401 and 402, and Buffer2 offers video-audio signal unit 403 and 404.Behind the substitution formula, try to achieve maximum temp[i], its meaning promptly for this reason i point be two pairs of the most similar starting points of buffer storage, we claim that this point is a datum mark (alignment).After trying to achieve datum mark, the substitution formula two again, obtain one section video-audio signal value of replacement.
Buffer1[alignment+i]＝(Buffer2[i]×i
+Buffer1[alignment+i]×unit-Buffer1[alignment+i]×i)/unit
(formula two) i=0～unit
Buffer1[wherein] be the address function of this first buffer storage, Buffer2[] be the address function of this second buffer storage, wherein variable alignment+i represents the datum mark address in the video-audio signal unit of this first buffer storage, and variable i represents to be arranged in the starting point address of the video-audio signal unit of this second buffer storage.
Because this looks for interpolation coefficient to need a large amount of multiplication, thus propose to find out the method for similitude at this by searching slope (slope) and number range, thus reduce the complexity of computing.Just, getting any in video-audio signal unit 403 and 404 is a comparison point, in 401 and 402, get an initial index point i401 then, a fixed numerical difference between scope (range A), from then on starting point begins more whether to have same slope and numerical difference between whether in range A; As not being, just look for backward, arrive index point i402 at most.When finding optimized datum mark, we understand substitution formula two, obtain one section new video-audio signal numerical value.The method greatly reduces the operand of asking similar waveform.
Fig. 4 C is depicted as the index point i401 in first buffer storage 41 is moved to the video-audio signal unit that next group needs compression, and second buffer storage 42 is promptly with the starting point (as shown index point i402) of formula two resulting datum marks as next compression step.
With result's output of second buffer storage, promptly obtaining the present invention is to reach the required compression video-audio signal of the purpose of video-audio signal fast-forward play at last.
The flow chart of steps that is video-audio signal fast-forward play method of the present invention shown in Figure 5, flow process is as follows:
Step S1: on demand a video-audio signal data flow is divided into a plurality of video-audio signals unit (unit);
Step S2: should a plurality of video-audio signals unit divide into groups to deposit at least one buffer storage (buffer) according to required compression ratio or fast-forward play speed, the reference that promptly stores as grouping as the described twice compression ratio of Fig. 4 A fast-forward play, and buffer storage i.e. first buffer storage 41 shown in Fig. 4 B, Fig. 4 C and second buffer storage 42 with two video-audio signal unit;
Step S3: in above-mentioned buffer storage, set a plurality of index values (index) and indicate the wherein address of video-audio signal, in first buffer storage 41 shown in Fig. 4 B one first index i401 is arranged, the second index i402 is arranged in second buffer storage 42;
Step S4: the sampling video-audio signal (sample) by a plurality of video-audio signals unit institute mark in each buffer storage calculates a reference point, and calculating this reference point is for drawing the initial point of interpolation coefficient algorithm (inter-coefficient);
Step S5: the initial point of above-mentioned steps is a datum mark (alignment point) of interpolation coefficient method, begin pointwise calculating from initial point foremost, look for the optimal criteria value with the interpolation coefficient algorithm, with datum mark (as formula two) as computing next time, and this first datum mark is to draw with the rule of thumb, draws next datum mark with this interpolation coefficient algorithm more afterwards;
Sampling video-audio signal (sample) in each video-audio signal unit is substitution formula two in proper order, add up at last get final product next datum mark;
Step S6: begin the calculation of interpolation coefficient method by the datum mark address, promptly cooperate each index address, by can drawing a new compression video-audio signal unit in the buffer storage, and export the output result of resulting fast-forward play;
Step S7: judge whether the video-audio signal compression is finished;
Step S8: if do not finish, first index bit of first buffer storage is moved to the next video-audio signal address that needs compression (compression ratio that is determined based on step S2), and repeat above-mentioned steps S5 to step S7, reach the purpose of fast-forward play to finish the video-audio signal compression;
Step S9:, then finish the step of this video-audio signal fast forward method if the video-audio signal compression is finished.
In the above-mentioned step, divide into groups deposit in buffer storage according to required compression ratio or fast-forward play speed a plurality of video-audio signals unit, if whenever read two video-audio signal unit again by new compression video-audio signal unit of buffer storage output, be the fast-forward play of twice compression ratio; If whenever read four video-audio signal unit again by new compression video-audio signal unit of buffer storage output, be four times of fast-forward play.
In sum, the present invention can produce the shortcoming of frequency conversion or sonic boom when solving known video-audio signal F.F., developed and the time-scaling algorithm (time scaling algorithm) of the video-audio signal fast-forward play of coming by time-scaling technology (time scaling) and propose one, audiorange restriction wherein reaches the purpose that video-audio signal compresses with the interpolation coefficient algorithm (inter-coefficient) that waveform slope calculates, and improved the tonequality of fast-forward play, and the power consumption in the time of being reduced in compression calculating, more can lower the utilization rate of internal memory, the effect of achieving many things at one stroke is arranged really.
The above only is a preferable possible embodiments of the present invention, is not to limit claim of the present invention with this, and the equivalent structure that all utilizations specification of the present invention and accompanying drawing content are done changes, and all is contained in the scope of patent protection of the present invention.
Claims (10)
1. video-audio signal fast-forward play method, this method is developed and a next interpolation coefficient algorithm that is used for the video-audio signal fast-forward play by a time zoom technology, in order to compress a video-audio signal data flow, wherein, the step of this video-audio signal fast-forward play method comprises:
A plurality of video-audio signal unit packet are deposited at least one buffer storage;
In this buffer storage, set a plurality of index points;
Set a reference point, this reference point is a datum mark of this interpolation coefficient algorithm;
Begin the calculation of this interpolation coefficient algorithm by this datum mark address, draw a new compression video-audio signal unit;
The index point of this buffer storage one is moved to next video-audio signal address;
Repeat above-mentioned steps and compress to finish video-audio signal, thus fast-forward play.
2. video-audio signal fast-forward play method as claimed in claim 1 is characterized in that, at the beginning of this step begins, this video-audio signal data flow is divided into this a plurality of video-audio signals unit.
3. video-audio signal fast-forward play method as claimed in claim 1 is characterized in that, includes a plurality of sampling video-audio signals in this video-audio signal unit.
4. video-audio signal fast-forward play method as claimed in claim 1, it is characterized in that, these a plurality of video-audio signal unit packet are being deposited in the step of at least one buffer storage, are to divide into groups to deposit in this at least one buffer storage according to required compression ratio or fast-forward play speed.
5. video-audio signal fast-forward play method as claimed in claim 1 is characterized in that, calculates the step of this reference point, is to begin pointwise by an initial point to calculate, with the datum mark as computing next time.
6. a video-audio signal fast-forward play method is developed and a next interpolation coefficient algorithm that is used for the video-audio signal fast-forward play by a time zoom technology, and in order to compress a video-audio signal data flow, wherein, the step of this video-audio signal fast-forward play method comprises:
This video-audio signal data flow is divided into a plurality of video-audio signals unit;
Should a plurality of video-audio signal unit packet deposit one first buffer storage and one second buffer storage in;
In this first buffer storage and this second buffer storage, set a plurality of index points;
Set a reference point, this reference point is a datum mark of this interpolation coefficient algorithm;
Begin the calculation of this interpolation coefficient algorithm by this datum mark address, draw a new compression video-audio signal unit; And
The index bit of this buffer storage one is moved to next video-audio signal address;
Repeat above-mentioned steps and compress to finish video-audio signal, thus fast-forward play.
7. video-audio signal fast-forward play method as claimed in claim 6 is characterized in that, includes a plurality of sampling video-audio signals in this video-audio signal unit.
8. video-audio signal fast-forward play method as claimed in claim 6, it is characterized in that, these a plurality of video-audio signal unit packet are being deposited in the step of this first buffer storage and this second buffer storage, are to divide into groups to deposit in this buffer storage according to required compression ratio or fast-forward play speed.
9. video-audio signal fast-forward play method as claimed in claim 6 is characterized in that, the formula that this datum mark begins pointwise calculating is:
temp[i]+＝Buffer1[index1+i]×Buffer2[index2+j]
Buffer1[wherein] be the address function of this first buffer storage, Buffer2[] be the address function of this second buffer storage, wherein variable i ndex1+i represents the sampling video-audio signal address in the video-audio signal unit of this first buffer storage, and variable i ndex2+j represents the sampling video-audio signal address in the video-audio signal unit of this second buffer storage.
10. video-audio signal fast-forward play method as claimed in claim 6 is characterized in that the computing formula of this interpolation coefficient algorithm is:
Buffer1[alignment+i]＝(Buffer2[i]×i
+Buffer1[alignment+i]×unit-Buffer1[alignment+i]×i)/unit
Buffer1[wherein] be the address function of this first buffer storage, Buffer2[] be the address function of this second buffer storage, wherein variable alignment+i represents the datum mark address in the video-audio signal unit of this first buffer storage, and variable i represents to be arranged in the starting point address of the video-audio signal unit of this second buffer storage.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101022028B (en) * | 2007-01-12 | 2010-08-18 | 炬力集成电路设计有限公司 | Quick forward or quick backward method for digital copyright management multimedia player |
| CN102136289A (en) * | 2010-12-30 | 2011-07-27 | 华为技术有限公司 | Methods, devices and systems for storing and reading media contents |
| CN102201844A (en) * | 2010-03-26 | 2011-09-28 | 卡西欧计算机株式会社 | Communication apparatus |
| CN102577192A (en) * | 2009-08-14 | 2012-07-11 | 苹果公司 | Synchronization of buffered audio data with live broadcast |
| US8311399B2 (en) | 2007-02-08 | 2012-11-13 | Huawei Technologies Co., Ltd. | Method for fast forward/backward play of video data and a streaming server |
| CN103475927A (en) * | 2012-06-08 | 2013-12-25 | 腾讯科技（深圳）有限公司 | Online-video real-time speed change play method and system thereof |
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| US6065050A (en) * | 1996-06-05 | 2000-05-16 | Sun Microsystems, Inc. | System and method for indexing between trick play and normal play video streams in a video delivery system |
| US6327418B1 (en) * | 1997-10-10 | 2001-12-04 | Tivo Inc. | Method and apparatus implementing random access and time-based functions on a continuous stream of formatted digital data |
| WO2004015688A1 (en) * | 2002-08-08 | 2004-02-19 | Cosmotan Inc. | Audio signal time-scale modification method using variable length synthesis and reduced cross-correlation computations |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101022028B (en) * | 2007-01-12 | 2010-08-18 | 炬力集成电路设计有限公司 | Quick forward or quick backward method for digital copyright management multimedia player |
| US8311399B2 (en) | 2007-02-08 | 2012-11-13 | Huawei Technologies Co., Ltd. | Method for fast forward/backward play of video data and a streaming server |
| CN102577192A (en) * | 2009-08-14 | 2012-07-11 | 苹果公司 | Synchronization of buffered audio data with live broadcast |
| CN102577192B (en) * | 2009-08-14 | 2015-06-17 | 苹果公司 | Synchronization of buffered audio data with live broadcast |
| CN102201844A (en) * | 2010-03-26 | 2011-09-28 | 卡西欧计算机株式会社 | Communication apparatus |
| CN102201844B (en) * | 2010-03-26 | 2014-05-21 | 卡西欧计算机株式会社 | Communication apparatus |
| US9020323B2 (en) | 2010-03-26 | 2015-04-28 | Casio Computer Co., Ltd. | Communication apparatus and storage medium |
| CN102136289A (en) * | 2010-12-30 | 2011-07-27 | 华为技术有限公司 | Methods, devices and systems for storing and reading media contents |
| CN102136289B (en) * | 2010-12-30 | 2013-03-13 | 华为技术有限公司 | Methods, devices and systems for storing and reading media contents |
| CN103475927A (en) * | 2012-06-08 | 2013-12-25 | 腾讯科技（深圳）有限公司 | Online-video real-time speed change play method and system thereof |
| CN103475927B (en) * | 2012-06-08 | 2015-04-08 | 腾讯科技（深圳）有限公司 | Online-video real-time speed change play method and system thereof |
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