CN1717936A - Encoder and its method - Google Patents
Encoder and its method Download PDFInfo
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- CN1717936A CN1717936A CNA2003801044577A CN200380104457A CN1717936A CN 1717936 A CN1717936 A CN 1717936A CN A2003801044577 A CNA2003801044577 A CN A2003801044577A CN 200380104457 A CN200380104457 A CN 200380104457A CN 1717936 A CN1717936 A CN 1717936A
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Abstract
An encoder adds delay time information DTI representing an initial delay time i_d and a delay time d of each group of grouped data to a position that a decoder reads before reading the frame data in the group of a coded stream data DBI and sends it to the decoder (3). The encoder does not send an initial offset delay time i_of to the decoder (3). At the timing defined by the initial offset delay time i_of, the encoder starts reading the coded stream data DBI from a transmission buffer and transmitting the data at a predetermined bit rate R.
Description
Technical field
The present invention relates to have the encoding device and the method for the feature in the method for managing buffer.
Background technology
Have and be used for providing such as the video data of coding and the system of the content-data the voice data by transmitting to decoding device via network etc.
Encoding device in this system is written to coded data in the transmission buffer, and at predetermined initial offset after time of delay, content data from this transmission buffer is so that be transferred to encoding device.
On the other hand, it is from decoding.
When locating to be stored in data volume among the transmission buffer E_BUF at timing t e shown in Figure 2 (2) and become 0, control circuit 11 suspends read encoding stream data DBI from transmission buffer E_BUF, till frame data f (3) is written to timing t i (3) among the transmission buffer E_BUF.
In addition, control circuit 11 adds delay time information, the initial delay time before beginning to read and the timing of reading the respective frame data of component content data from reception buffer of expression overflow and underflow in content-data, and the reception buffer D_BUF of this transfer of data to decoding device 3.
Traditional encoding device regularly is 0 to specify the above-mentioned initial delay time by the beginning of supposing above-mentioned initial offset time of delay.Therefore, encoding device also adds the initial offset delay time information in content-data except adding above-mentioned delay time information, and transmits this content-data to decoding device.
Yet, in above-mentioned legacy system,, therefore exist the step of processing and the heavy problem of processing load of encoding device to occur being used to add because the initial offset delay time information is added in the content-data.
In addition, by adding the initial offset delay time information, there is the big problem of information quantitative change of content-data.
Summary of the invention
Consider that above-mentioned relevant issues make the present invention, and an object of the present invention is to provide a kind of encoding device and method that can reduce the processing load on the encoding device and reduce the traffic simultaneously.
In addition, an object of the present invention is to provide a kind of encoding device and method that can reduce the required memory capacity that is used to decode of storage arrangement.
Description of drawings
Fig. 1 is the configured in one piece view of the communication system in the first embodiment of the invention;
Fig. 2 is the view that is used to illustrate the timing of video data EBI shown in Figure 1, encoding stream data DBI and video data DBO;
Fig. 3 is a flow chart, is used for illustrating the operation of the control circuit of encoding device shown in Figure 1;
Fig. 4 is the circumscribed view that is used to illustrate traditional encoding device;
Fig. 5 is a view, is used for illustrating the operation of control circuit of the encoding device of second embodiment of the invention;
Fig. 6 is the configured in one piece view of the communication system in the third embodiment of the invention; And
Fig. 7 is a view, is used for illustrating the operation of control circuit of the encoding device of fourth embodiment of the invention.
Embodiment
Below, with the communication system of describing according to the embodiment of the invention.
Fig. 1 is the configured in one piece view of the communication system 1 in the first embodiment of the invention.
As shown in Figure 1, communication system 1 comprises for example encoding device 2 and decoding device 3.
Encoding device 2 generates encoded data D BI and arrives decoding device 3 via these data of Network Transmission.
[encoding device 2]
As shown in Figure 1, encoding device 2 comprises for example coding circuit 10, control circuit 11 and transmission buffer E_BUF.
Here, coding circuit 10 is corresponding to the code device in first invention, and control circuit 11 is corresponding to the control device in first invention, and transmission buffer E_BUF is corresponding to the storage arrangement in first invention.
Video data EN is made up of the grouped data that for example comprises a plurality of frame data respectively.
In current embodiment, as example, the grouped data of video data EN is made up of to f (4) 5 frame data f (0).
In addition, control circuit 11 for each grouped data of forming video data EN specify initial offset i_of time of delay, initial delay time i_d and time of delay d.
In addition, control circuit 11 generate the initial delay time i_d that is illustrated in each frame data in the grouped data and time of delay d delay time information DTI, this information is added to the position of at first being read by decoding device 3 in each grouped data, and be transferred to decoding device 3 as encoding stream data DBI in timing place shown in Figure 2.
Initial delay time i_d represents to read in the first frame data f (0) in the middle of a plurality of frame data that belong to grouped data to the timing of decoding circuit 14 from the reception buffer D_BUF of decoding device 3.Here, in current embodiment, be the timing that first frame data of the grouped data in video data EBI are written to the operation among the transmission buffer E_BUF 0 by supposing beginning as shown in Figure 2, specify initial delay time i_d.
In addition, d time of delay (1) represents for a plurality of frame data that belong to this grouped data from reading the former frame data of these frame data to the time of reading these frame data from reception buffer D_BUF from reception buffer D_BUF with the decoding order to d (4).
That is, control circuit 11 does not transmit initial offset i_of time of delay to decoding device 3.
As shown in Figure 2, control circuit 11 begins to read encoding stream data DBI with pre-determined bit speed R from transmission buffer E_BUF in timing place by initial offset i_of time of delay appointment.
Then, when locating to be stored in data volume among the transmission buffer E_BUF at timing t e shown in Figure 2 (2) and become 0, control circuit 11 suspends and reads encoding stream data DBI from transmission buffer E_BUF till frame data f (3) is written to timing t i (3) among the transmission buffer E_BUF.
In addition, control circuit 11 is considered (burst) characteristic of bursting of encoding stream data DBI, to determine at least one among frame data initial offset i_of time of delay and the initial delay time i_d, so that can not cause overflow and underflow in the reception buffer D_BUF of decoding device 3.
The operation example of encoding device shown in Figure 12 will be described below.
Step ST1:
Step ST2:
Step ST3:
Step ST4:
Step ST5:
Step ST6:
That is, control circuit 11 does not transmit initial offset i_of time of delay to decoding device 3.
Step ST7:
As mentioned above, according to communication system 1, encoding device 2 is storing initial offset delay time i_of in delay time information DTI not, so can reduce the amount of information that will be transferred to decoding device 3 from encoding device 2.
[decoding device 3]
As shown in Figure 1, decoding device 3 comprises for example reception buffer D_BUF and decoding circuit 14.
Decoding device 3 is written to the video data DBI that receives from encoding device 2 the reception buffer D_BUF.
In current embodiment, the time of reading the timing of encoding stream data DBI and writing these data from the transmission buffer E_BUF of encoding device 2 in the reception buffer D_BUF of decoding device 3 mates.
Based on the delay time information DTI that is included in the respective packets data among the encoding stream data EBI, decoding circuit 14 from transmission buffer E_BUF, read belong to the grouped data of wanting processed frame data as video data DBO, and output the data to decoding circuit 14.
Promptly, decoding circuit 14 begins to read the first frame data f (0) of above-mentioned grouped data in timing place by the initial delay time i_d appointment among the delay time information DTI, reads frame data f (1) to f (4) based on d time of delay (1) from reception buffer D_BUF to d (4) then.
In current embodiment, because by supposition beginning encoding stream data DBI being written to timing among the reception buffer D_BUF is 0 to specify initial delay time i_d, so decoding device 3 can be specified the timing of the first frame data f (0) that begins reading in packet data and need not be used initial offset i_of time of delay.
Decoding circuit 14 is a unit with frame data, the video data DBO that decoding is read from reception buffer D_BUF.
In addition, according to communication system 1, as shown in Figure 2, the timing that first frame data of the grouped data among the video data EBI is written to the operation of transmission buffer E_BUF by supposition beginning is 0 to come specified delay time i_d, decoding device 3 can be specified the timing of the first frame data f (0) in the grouped data that reads the encoding stream data from reception buffer D_BUF based on i_d time of delay that is represented by delay time information DTI.
It is also noted that: though in Fig. 1, the situation of using single encoded equipment 2 has been described as example, but from a plurality of encoding devices 2 under the situation of single decoding device 3 transfer encoding flow data DBI, decoding device 3 can be in the middle of the encoding stream data DBI of a plurality of receptions preferentially begin decoding from those encoding stream data with shorter initial delay time i_of successively.
Thereby, can realize the system of high responsiveness.
Second embodiment
For example, as shown in Figure 4, the coding circuit 10 of the encoding device 2 among above-mentioned first embodiment writes the follow-up grouped data G's (1) that belongs to the grouped data G (0) that wants processed to reception buffer D_BUF in beginning, timing place of final frame data with the decoding order, determine to belong to the grouped data G's (0) that wants processed, with the data volume of final frame data f (4) of decoding order, so as from reception buffer D_BUF, all to read belong to the grouping G (0) that wants processed frame data to decoding circuit 14 (data volume that is stored among the reception buffer D_BUF becomes 0).
Except following some, the encoding device 2a in current embodiment is identical with encoding device 2 in above-mentioned first embodiment.
Promptly, for example as shown in Figure 5, the coding circuit 10a of encoding device 2a among the current embodiment write to reception buffer D_BUF in beginning the follow-up grouped data G (1) that belongs to the grouped data G (0) that wants processed, with timing place of the first frame data f (0) of decoding order, determine to belong to the grouped data G (0) that wants processed, with the data volume of the final frame data f (4) of decoding order, and from reception buffer D_BUF, do not read the restriction of whole frame data of belonging to the grouping G (0) that wants processed to decoding circuit 14.
Therefore, in current embodiment, there is some such situation, wherein beginning to reception buffer D_BUF write the follow-up grouped data G (1) that belongs to the grouped data G (0) that wants processed, with the first frame data f (0) of decoding order the time regularly locate, in reception buffer D_BUF, keep belonging to the frame data of the grouping G (0) that wants processed.
Therefore, coding circuit 10a needn't be in the frame data f (4) that belongs to the grouped data G (0) that wants processed, will be decoded at last the insertion padding data (for example, data " 0 "), these padding datas can not be written among the reception buffer D_BUF and cause the picture quality variation.Therefore, can improve picture quality according to the decoded picture of frame data f (4).
The 3rd embodiment
Fig. 6 is the configured in one piece view of the communication system 1b among the current embodiment.
As shown in Figure 6, communication system 1b comprises for example encoding device 2b and decoding device 3b.
Decoding device 3b multichannel from encoding stream data STR decomposites video data DBI_V and voice data DBI_A, and decodes them respectively.
[encoding device 2]
As shown in Figure 6, encoding device 2 comprises for example coding circuit 10V, control circuit 11V, transmission buffer E_BUF_V, coding circuit 10A, control circuit 11A, transmission buffer E_BUF_A and multiplex electronics 30 (MUX).
Here, video data EN_V is corresponding to the video data EN among first embodiment, and video data EBI_V is corresponding to the video data EBI among first embodiment, and encoding stream data DBI_V is corresponding to the encoding stream data DBI among first embodiment.
In current embodiment, control circuit 11V except the operation of coding circuit 10 in first embodiment, also represents the information i_of_D of initial offset i_of time of delay to control circuit 11A output.
In addition, the initial delay time i_d of coding circuit 11V each frame data in control circuit 11A output expression grouped data and time of delay d delay time information DTI.
Then, control circuit 11A reads in the frame data at the grouped data top among the encoding stream data DBI_A, and outputs the data to multiplex electronics 30 based on top definite initial offset i_of_A time of delay from transmission buffer E_BUF_A.
In addition, control circuit 11A generates audio frequency delay time D TI_A (initial delay time i_d_A) based on the slowed-down video time D TI (initial delay time i_d) from control circuit 11V input, and adds these data in encoding stream data DBI_A.
In addition, control circuit 11A and 11V can determine the transmission bit rate of encoding stream data DBI_V and DBIA, so that make encoding stream data DBI_V and DBI_A synchronous.
In addition, control circuit 11A can be based on initial offset i_of_A time of delay that imports from control circuit 11V and at least one the slowed-down video time D TI, determine to the needed memory span of the reception buffer D_BUF_A of decoding device 3b memory encoding flow data DVI_A, add the information of this memory span of expression and be passed to multiplex electronics 30.
30 pairs of multiplex electronics carry out multiplexed from the video coding flow data DBI_V of transmission buffer E_BUF_V input and the audio coding flow data DBI_A that imports from transmission buffer E_BUF_A, generating encoding stream data STR, and export this data to decoding device 3b.
[decoding device 3b]
As shown in Figure 6, decoding device 3b comprises for example multichannel decomposition circuit 31, reception buffer D_BUF_V, decoding circuit 14V, reception buffer D_BUF_A and decoding circuit 14A.
Here, decoding circuit 14V is based on the delay time information DTI reading video data DBO_V from reception buffer D_BUF_V that is stored among the encoding stream data DVI_V, and it is decoded.
In addition, decoding circuit 14A reads voice data DBO_A based on the delay time information DTI_A that is stored among the encoding stream data DVI_A from reception buffer D_BUF_A, and it is decoded.
As mentioned above, according to the communication system 1b of current embodiment, even under the situation that multiplex video and audio frequency are used to transmit, also can obtain the effect identical with first embodiment.
In addition, according to encoding device 2b,, can make video and audio sync by information i_of_D and the delay time information DTI of expression initial offset i_of time of delay that is generated by control circuit 11V are provided to control circuit 11A.
The 4th embodiment
Except the part of control circuit 11 was handled, the encoding device 2c among the current embodiment was identical with encoding device 2 in first embodiment shown in Figure 1.
Below, will 11 different processing be described with control circuit to the control circuit 11c among the encoding device 2c of current embodiment.
Fig. 7 is a view, is used to illustrate the timing by the control circuit 11c specified coding flow data DBI of current embodiment.
As shown in Figure 7, the data volume of the frame data of control circuit 11c in being stored in reception buffer D_BUF becomes the operation that suspended before 0 to decoding device 3 transfer encoding flow data DBI, and after predetermined pause period STT, recover to decoding device 3 transfer encoding flow data DBI.
Specifically, control circuit 11c reference shown in Figure 7 regularly " 0 " locate to begin to read in the grouped data, with the first frame data f (0) of decoding order, and, suspend the transmission (read operation from transmission buffer E_BUF) of encoding stream data DBI when reaching when finishing the timing t x that reads.
Then, the transmission of the timing t y place recovery encoding stream data DBI of control circuit 11c after predetermined pause period STT.
In current embodiment, timing t y is designated as just first frame data f (0) before the timing of decoding in above-mentioned grouped data in the decoding circuit 14 of beginning at decoding device 3.
As mentioned above, according to encoding device 2c,, can reduce the needed memory span of reception buffer D_BUF of decoding device by the timing of prescribed coding flow data DBI as shown in Figure 7.
Industrial applicibility
The present invention can be applied to coded system and be used for the management buffer.
Claims (16)
1, a kind of encoding device comprises:
Code device, being used to generate will be with the decoded a plurality of coded data of predesigned order,
Storage arrangement is used to store the described coded data that is generated by described code device, and
Control device is used for reading described coded data and sending to the decoding destination from described storage arrangement;
Wherein said control device is determined from being written in the middle of the described a plurality of coded datas that generated by described code device, the described coded data that by the decoding order is first is up to reading these data and to first time of delay of decoding destination till transmitting these data, determine that to be received in the middle of described a plurality of coded data by the decoding order be second time of delay of first described coded data to this first coded data of decoding from being located in described decoding purpose, to the described decoding destination transmission expression delay time information of described second time of delay, and based on the described first definite time of delay be first described first coded data to the transmission of described decoding destination by the decoding order.
2, encoding device as claimed in claim 1, it is characterized in that: the timing of operation that described code device begins to read described first coded data and transmit these data to the decoding destination from described storage arrangement by supposition is determined described second time of delay of the timing of described first coded data of expression decoding for reference to regularly.
3, encoding device as claimed in claim 2 is characterized in that: described code device is described with reference to regularly being 0 to determine described second time of delay by supposing.
4, encoding device as claimed in claim 1, it is characterized in that: described control device, be each of described a plurality of coded datas, the 3rd time of delay till determining from the last coded data before being positioned at described coded data in the decoding of described decoding destination according to the decoding order to this coded data of decoding, and will further comprise the described delay time information of the 3rd time of delay and send to described decoding destination.
5, encoding device as claimed in claim 1 is characterized in that: described control device is not to the described decoding destination transmission expression information of described first time of delay.
6, encoding device as claimed in claim 1 is characterized in that:
When the described coded data that remains on the reception of described decoding destination in the decode stored apparatus is decoded to it afterwards,
Described code device determine from the described decode stored apparatus to described decoding destination write described first coded data to read this first coded data from described decode stored apparatus and decode till described second time of delay.
7, encoding device as claimed in claim 6, it is characterized in that: for each group that constitutes by described a plurality of coded datas, described control device is determined the relevant described delay time information that belongs to the described coded data of this group, and transmits this delay time information to described decoding destination.
8, encoding device as claimed in claim 7, it is characterized in that: described control device allow beginning to the decode stored apparatus write the subsequent group that belongs to the group of wanting processed, according to the timing of described first coded data of decoding order, the described coded data that will belong to the group of wanting processed remains in the described decode stored apparatus to store.
9, encoding device as claimed in claim 1, it is characterized in that: multiplexed when being transferred to described decoding destination when the described coded data of the described coded data of video and audio frequency is carried out, described control device is based upon determined described first time of delay of coded data of described video and at least one in second time of delay, is identified for storing in described second time of delay of described coded data of the memory span of described storage arrangement of described coded data of described audio frequency and described audio frequency at least one.
10, encoding device as claimed in claim 1, it is characterized in that: when carrying out multiplexed with when transmit described decoding destination to the described coded data of video and the described coded data of audio frequency, described control device is determined described first time of delay of the described coded data of described first time of delay of described coded data of described video and described audio frequency, so that make described video and described audio sync.
11, encoding device as claimed in claim 1, it is characterized in that: when carrying out multiplexed with when transmit described decoding destination to the described coded data of video and the described coded data of audio frequency, bit rate and the bit rate when the described coded data of the described audio frequency of transmission when described control device is determined the described coded data of the described video of transmission are so that make described video and described audio sync.
12, encoding device as claimed in claim 1, it is characterized in that: described code device is determined in described first time of delay and described second time of delay at least one by the characteristic of bursting of considering described coded data, so that can not cause overflow and underflow in described second memory device.
13, a kind of encoding device comprises:
Code device, being used to generate will be with the decoded a plurality of coded data of predesigned order,
Storage arrangement is used to store the described coded data that is generated by described code device, and
Control device is used for described coded data from described storage arrangement to decoding destination transmission that read from, and the information that is used to specify the timing of the described coded data of decoding in described decoding destination;
Described control device time-out read described coded data before wherein the data volume of the described coded data in being stored in described storage arrangement became 0 from described storage arrangement, and after predetermined interval, from described storage arrangement, read described coded data to recover transmission operation to described decoding destination.
14, encoding device as claimed in claim 13, it is characterized in that: described control device reads according to described first coded data of decoding order from described storage arrangement and is transferred to the timing of the operation of described decoding destination finishing, begin described pause period, and, finish described interval in the just timing described decoding destination is read this first coded data and decoded from described decode stored apparatus before.
15, a kind of coding method comprises:
First step, determine from write to storage arrangement in the middle of a plurality of coded datas, according to the decoding order be first described coded data up to reading these data and first time of delay till these data are transmitted in the decoding destination,
Second step is determined second time of delay of described first coded data till this first coded data of decoding in the middle of receive described a plurality of coded data in described decoding destination, and
Third step, be shown in described second step delay time information of described second time of delay of determining to described decoding destination transmission table, and based on first time of delay of in described first step, determining, to described decoding destination transmission described first coded data according to the decoding order.
16, a kind of coding method comprises:
First step, to storage arrangement write a plurality of will be with the decoded coded data of predesigned order, and
Second step reads described coded data from described storage arrangement, and the information of timing that is used to specify the described coded data of decoding in the decoding destination, and transmits these data and information to described decoding destination;
Described second step time-out read described coded data before wherein the data volume of the described coded data in being stored in described storage arrangement became 0 from described storage arrangement, and after predetermined pause period, recover from described storage arrangement, to read described coded data.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002349287A JP2004186840A (en) | 2002-11-29 | 2002-11-29 | Method for using non-initialized buffer model |
| JP349287/2002 | 2002-11-29 | ||
| JP356054/2002 | 2002-12-06 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1717936A true CN1717936A (en) | 2006-01-04 |
| CN100534177C CN100534177C (en) | 2009-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003801044577A Expired - Fee Related CN100534177C (en) | 2002-11-29 | 2003-11-28 | Encoder and its method |
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| Country | Link |
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| JP (1) | JP2004186840A (en) |
| CN (1) | CN100534177C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102104780A (en) * | 2009-12-16 | 2011-06-22 | 索尼公司 | Transmitting apparatus and method, and receiving apparatus and method |
| CN101401373B (en) * | 2006-03-17 | 2011-09-28 | 日本电气株式会社 | Encoded stream sending device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1139665A1 (en) * | 2000-03-29 | 2001-10-04 | Deutsche Thomson-Brandt Gmbh | Method and apparatus for changing the output delay of audio or video data encoding |
-
2002
- 2002-11-29 JP JP2002349287A patent/JP2004186840A/en active Pending
-
2003
- 2003-11-28 CN CNB2003801044577A patent/CN100534177C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101401373B (en) * | 2006-03-17 | 2011-09-28 | 日本电气株式会社 | Encoded stream sending device |
| CN102104780A (en) * | 2009-12-16 | 2011-06-22 | 索尼公司 | Transmitting apparatus and method, and receiving apparatus and method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004186840A (en) | 2004-07-02 |
| CN100534177C (en) | 2009-08-26 |
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