CN1988493B - Buffer reset system and method thereof - Google Patents

Abstract

The invention relates to a resetting system of a buffer and a method thereof, wherein the resetting system comprises a resetting flag and a control unit, the resetting flag is arranged on the buffer, and the resetting method is characterized in that the resetting flag is set by the control unit, so that each exchange of a processing unit can read the data of the buffer again to process the data of the buffer, thereby improving the use efficiency of the buffer. In addition, the buffer can be further provided with an overwrite flag to prevent the data from being overwritten into the buffer, so as to retain the data in the buffer and avoid the data loss of the buffer.

Description

Buffer reset system and method thereof

technical field

The present invention relates to a buffer, in particular to a buffer reset system and method thereof.

Background technique

Press, today's streaming system is mostly used on the Internet, allowing people to listen to radio, music or watch videos on the Internet. A general basic streaming system includes a plurality of processing units and a plurality of buffers, wherein a buffer is arranged between adjacent processing units for temporarily storing data. Please refer to FIG. 1, which is a block diagram of a conventional streaming system. This streaming system is used in the Internet. As shown in the figure, the streaming system includes a first processing unit 20', a second processing unit 22', a third processing unit 24', and a fourth processing unit 26' , a first buffer 30' and a second buffer 32'. The first processing unit 20' is used to download data from the Internet and store it in the first buffer 30'.

The second processing unit 22' and the third processing unit 24' are used to respectively process the data of the first buffer 30' according to the data type of the first buffer 30', such as MP3, WMA or WMV. The second processing unit 22' reads and processes the data from the first buffer 30' and stores the processed data in the second buffer 32', if the second processing unit 22' cannot process the first buffer 30 ', the system will reset the first buffer 30' and re-read the data in the first buffer 30' by the third processing unit 24' for processing, and then store the processed data in the second buffer device 32'. Next, the processed data is read from the second buffer 32' by the fourth processing unit 26' and played. Wherein the buffers 30', 32' are first in first out (First In First Out, FIFO) and are ring buffers (Ring Buffer).

Please refer to FIG. 2A , which is a schematic diagram of a state of storing data in a conventional ring buffer. As shown in the figure, the buffer 1' has a start pointer 5' and an end pointer 7', and the buffer 1' uses the start pointer 5' and the end pointer 7' to indicate the start bit of the data 10' stored in the buffer 1' address and end address. When the data 10' is read, the start pointer 5' moves forward to point to the last address where the data is read.

Furthermore, please refer to FIG. 2B , which is a schematic diagram of a state of overwriting data into a conventional ring buffer. As shown in the figure, when the data 10' of the buffer 1' is read, the start pointer 5' will move forward to the address after the data 10' was last read, that is, if the data 10' is read After completion, the start pointer 5' and the end pointer 7' point to the same address. Afterwards, if a data 12' is stored in the buffer 1', the data 12' will be written from the address indicated by the end pointer 7', and the end pointer 7' will move forward until the writing of the data 12' is completed until buffer 1'. If the data 12' is written to the last address of the buffer 1', and the data 12' has not been completely written, the data 12' will be written continuously from the initial address of the buffer 1', and the Overwrite the read material 10'. Therefore, this buffer 1' is called a ring buffer.

Please refer to FIG. 1 again, if the second processing unit 22' cannot process the data of the first buffer 30', and the third processing unit 24' tries to read and process the data of the first buffer 30' instead , because the second processing unit 22' has read a part of the data, so the start flag 5' points forward to the address after the second processing unit 22' has read the data, so the third processing unit 24' cannot re-read at this time. The original data of the first buffer 30' is retrieved, so we need to reset the system so that the first processing unit 20' is exchanged for the third processing unit 24' to process data.

Therefore, how to propose a novel buffer reset system and its method in view of the above problems can not only improve the defect that the exchanged processing unit cannot read the original data of the buffer, but also avoid buffering. The original data of the device is overwritten, which can solve the above problems.

Contents of the invention

The main purpose of the present invention is to set a reset flag and a reset function in the buffer, so that when the processing unit is exchanged, the reset flag can be allowed to reset the buffer, so that the exchanged processing unit can Re-read the original data of the buffer.

Another object of the present invention is to set an overwrite flag in the buffer, when it is not determined whether the subsequent processing unit can process the data in the buffer, the overwrite flag can be set so that the subsequent data cannot be overwritten to the buffer to avoid overwriting the original data in the buffer and avoid losing the original data in the buffer.

In order to achieve the above-mentioned purpose, the buffer reset system of the present invention includes a reset function, a reset flag, an overwrite flag and a control unit, the reset flag and the overwrite flag are set in the buffer , the control unit is used to call the reset function and set the overwrite flag, the buffer can be reset by the controller calling the reset function, so that the processing unit can re-read the data of the buffer after the exchange, and set the overwrite flag Write flags can preserve the data in the buffer to avoid data loss.

The reset method of the present invention is to call the reset function and confirm the reset flag according to the status of the processing unit processing the data in the buffer. When a first processing unit reads the data in the buffer and cannot process it, the control unit confirms the reset flag and calls the reset function to exchange a second processing unit with the first processing unit, allowing the second processing unit to replace The first processing unit re-reads the data in the buffer and processes it. When data is written into the buffer, the reset flag will be set to false (False). In addition, when it is uncertain whether the processing unit can process the data in the buffer, the overwrite flag can be set by the control unit to be A non-overwrite parameter value, so that the subsequent data cannot be overwritten to the buffer, that is, the data cannot be overwritten on the old data, and the overwrite flag is set to an overwrite until it is confirmed that the processing unit can process the data in the buffer Write the parameter value so that subsequent data can be overwritten to the buffer.

The beneficial effects of the present invention are: a reset flag and a reset function can be set in the buffer, so that when the processing unit is exchanged, the reset flag can be allowed to reset the buffer, so that the exchanged processing unit can be reset Read the original data of the buffer. An overwrite flag can also be set in the buffer. When it is not determined whether the subsequent processing unit can process the data in the buffer, the overwrite flag can be set so that the subsequent data cannot be overwritten to the buffer to avoid overwriting the buffer. The original data in the buffer can be used to prevent the original data in the buffer from being lost.

Description of drawings

Figure 1 is a block diagram of a conventional streaming system;

FIG. 2A is a schematic diagram of a state of storing data in a conventional ring buffer;

FIG. 2B is a schematic diagram of a state of overwriting data to a conventional ring buffer;

Fig. 3 is a block diagram of a preferred embodiment of the present invention;

FIG. 4 is a schematic diagram of a state in which the buffer is set to a non-overwriting parameter;

Fig. 5 is the block diagram of another preferred embodiment of the present invention;

Fig. 6 is a flow chart of a preferred embodiment of the present invention;

Fig. 7 is a flowchart of another preferred embodiment of the present invention.

Description of figure number:

1'buffer 5'start indicator

7'End indicator 10'Information

12'data 20'first processing unit

22'second processing unit 24'third processing unit

26' fourth processing unit 30' first buffer

32' second buffer 2 start indicators

4 End indicator 6 Old information

8 new data 10 buffer

13 reset flag 16 override flag

20 The first processing unit 22 The second processing unit

24 The third processing unit 30 Control unit

40 download units 50 first buffer

53 reset flag 56 override flag

60 decoding module 62 first decoding unit

64 second decoding unit 66 third decoding unit

70 second buffer 80 playback unit

Detailed ways

In order to enable the examiners to have a further understanding and understanding of the structural features and the achieved effects of the present invention, a preferred embodiment and a detailed description are provided, as follows:

Please refer to FIG. 3 , which is a block diagram of a preferred embodiment of the present invention. As shown in the figure, the reset system of the buffer of the present invention includes a control unit 30, a reset flag 13 and an overwrite flag 16, and both the reset flag 13 and the overwrite flag 16 are set in a buffer device 10. The control unit 30 is used for confirming and confirming the state of the resettable flag 13 and changing the overwriteable flag 16 to control the data reading and writing of the buffer 10 . The control unit 30 confirms that the reset flag 13 is set, and then the control unit 30 allows the reset function to be called to reset the buffer 10, that is, the start pointer of the reset buffer 10 returns to the start address of the buffer 10, In this way, the third processing unit 24 can re-read the original data of the buffer 10 for processing when the second processing unit 22 cannot process the data read from the buffer 10 . If the reset flag 13 is set to a non-reset parameter, then the control unit 30 cannot reset the buffer 10. Initially, the reset flag 13 is set to a reset parameter. When any data is overwritten in the buffer 10, the reset flag 13 will be automatically set to the non-reset flag.

When the control unit 30 sets the overwrite flag 16 to a non-overwrite parameter value, it is "false" (False) in the logic, and the original data of the buffer 10 cannot be overwritten by the data. Please also refer to FIG. 4 As shown, when the overwrite flag 16 is set to a non-overwrite parameter value, the data will be written into the buffer 10, until the end indicator reaches the last address of the buffer 10, the data cannot be overwritten into the buffer 10 , that is to say that the buffer 10 has stored the old data 6, when the overwrite flag 16 is set to a non-overwrite parameter value, new data can be written into the buffer 10 after the start flag 2 until the buffer 10 is full capacity, that is, the end flag 4 is moved to the end of the buffer 10, which can prevent the first processing unit 20 from subsequently writing data in the buffer 10, and cover the original data in the buffer 10, so that the second processing unit 22 or the third processing unit 24 reads the data of the buffer 10, and the original data of the buffer 10 can still be retained. When the control unit 30 sets the overwrite flag 16 to an overwrite parameter value, it is “true” in logic, and the buffer 10 can be overwritten with data.

The following is an example to illustrate the present invention. After the first processing unit 20 stores a first data in the buffer 10, the second processing unit 22 reads the first data from the buffer 10 for processing. When processing the first data, the second processing unit 22 will send a response message to the control unit 30 to notify the control unit 30 that the first data can be processed. If the second processing unit 22 can process the first data, the control unit 30 sets the overwrite flag as the overwrite parameter value according to the response message indicating that the data can be processed, so that the first processing unit 20 can overwrite the data to the buffer 10. If the second processing unit 22 cannot process the first data, the control unit 30 will confirm the overwrite flag 16 of the buffer 10, and if the reset flag is set to “true” in logic, the buffer will be reset 10, and promptly send an exchange message to the third processing unit 24 according to the response message indicating that the data cannot be processed, that is to say, when the second processing unit 22 cannot process the first data, the control unit 30 will exchange the second processing unit 22 with the The third processing unit 24 , the third processing unit 24 replaces the second processing unit 22 .

In addition, the control unit 30 also resets the buffer 10 and sets the reset flag 13 as a reset parameter value when sending the driving message, so as to reset the buffer 10 so that the start pointer returns to point to the first position of the buffer 10. The starting position of the data allows the third processing unit 24 to read the first data from the starting position where the buffer 10 stores the first data, thus solving the problem that the third processing unit 24 cannot process the buffer in the second processing unit 22 When the data of the buffer 10 is used, the original data of the buffer 10 cannot be read again, so as to improve the performance of the buffer 10. As mentioned above, when the third processing unit 24 is processing the first data, it will also send a response message to the control unit 30, so that the control unit 30 sets the overwrite flag 13 as the overwrite parameter value, so that the first processing unit 20 can continue to overwrite Write data to buffer 10. As mentioned above, if the overwrite flag is set to an overwrite parameter value and the first processing unit 20 writes enough data into the buffer 10 to overwrite some data, then reset the flag 13 to a non-reset parameter value.

In addition, if the first processing unit 20 cannot process the data in the buffer 10 and the third processing unit 24 cannot process the data in the buffer 10, it will send a response message indicating that the data cannot be processed to the control unit 30. When any other processing unit, at this time the control unit 30 will send an exchange message to other processing units to exchange the third processing unit 24, allowing other processing units to replace the third processing unit 24, and the control unit 30 will reset the buffer 10 at the same time And reset flag 13 is set to reset parameters.

Please refer to FIG. 5 , which is a block diagram of another preferred embodiment of the present invention. As shown in the figure, the buffer reset system of the present invention can be applied to a network streaming system. The streaming system includes a download unit 40 , a first buffer 50 , a decoding module 60 , a second buffer 70 and a playback unit 80 . The download unit 40 downloads a network data through the Internet and writes it into the first buffer 50 . The web data may be in WMA, WMV or MP3 data format or any other format. It is initially uncertain whether a first decoding unit 62 , a second decoding unit 64 and a third decoding unit 66 of the decoding module 60 can decode the network data in the first buffer 50 . The overwrite flag 56 of the first buffer 50 is initially set as a non-overwrite parameter, so the switching of the decoding unit can be ensured.

The decoding module 60 is used to decode the network data of the first buffer 50. The first decoding unit 62, the second decoding unit 64 and the third decoding unit 66 of the decoding module 60 are respectively used for WMA, WMV and MP3 The data format is decoded. When the first buffer 50 stores network data, the first decoding unit 62 will first read the network data of the first buffer 50, if the network data of the first buffer 50 is in WMA format, the first decoding The unit 62 is ready to decode, and sends a response message indicating that it can be processed to the control unit 30, so that the control unit 30 knows that the first decoding unit 62 can decode network data, and at this time the control unit 30 will set the first buffer The overwrite flag 56 is an overwrite parameter value, so that the download unit 40 can continuously store network data in the first buffer 50 .

If, when the network data downloaded by the download unit 40 is in MP3 format, the first decoding unit 62 will not be able to decode, and at this moment, the first decoding unit 62 will send a response message indicating that it cannot be processed to the control unit 30, so that the control unit 30 It is known that the first decoding unit 62 cannot decode the network data in the first buffer 50 . The control unit 30 will then send an exchange message to the second decoding unit 64, and exchange the first decoding unit 62 and the second decoding unit 64, so that the second decoding unit 64 replaces the first decoding unit 62, and will reset the first buffer at the same time 50 , so that the second decoding unit 64 can re-read the original network data of the first buffer 50 , that is, read the network data that cannot be decoded by the first decoding unit 62 .

Since the second decoding unit 64 decodes the network data in the WMV format, the second decoding unit 64 cannot decode the network data in the MP3 format. At this time, the second decoding unit 64 will also send a response message indicating that it cannot be processed to the control unit 30, so that the control unit 30 sends a driving message to the third decoding unit 66, and the second decoding unit 64 and the third decoding unit 66 are exchanged. , let the third decoding unit 66 replace the second decoding unit 64, and reset the first buffer 50 again. The third decoding unit 66 can reread the network data in the first buffer 50 .

Since the format of the network data stored in the first buffer 50 conforms to the decodable data format of the third decoding unit 66, the third decoding unit 66 will send a response message indicating that it can be processed to the control unit 30, and the control unit 30 will Set the overwrite flag 56 according to the response message to overwrite the parameter value, so that the download unit 40 can allow the storage of network data to the first buffer 50, and cover the original network data, so that the third decoding unit 66 can continue The network data of the first buffer 50 is read and decoded.

If the format of the network data downloaded by the download unit 40 is not WMA, WMV and MP3, since the decoding units 62, 64, and 66 of the decoding module 60 cannot decode the network data stored in the first buffer 50, In addition, the control unit 30 cannot detect the presence of other decoding units in the network streaming system, which means that the network streaming system is faulty and cannot decode the network data stored in the first buffer 50 .

As mentioned above, after the first decoding unit 62 , the second decoding unit 64 or the third decoding unit 66 decodes the network data, the generated decoded data will be stored in the second buffer 70 . Afterwards, the playing unit 80 reads the decoded data in the second buffer 70 for playing. In this embodiment, since the format of the decoded data generated by the decoding module 60 conforms to the format of the data playable by the playback unit 80, the second buffer 70 does not need to set the reset flag and the overwrite flag. In this embodiment, the overwrite flag is initially set to "true", and the second buffer 70 is equivalent to a conventional ring buffer, however, the second buffer 70 can also be applied to different data formats.

Please refer to FIG. 6 , which is a flowchart of a preferred embodiment of the present invention. For ease of description, this embodiment is described in conjunction with FIG. 3 . When it is uncertain whether the processing units 22 and 24 of the system can process the data stored in the buffer 10, the overwrite flag 16 of the buffer 10 can be set to a non-overwriting parameter value so that the first processing unit 20 cannot store the data. The data is sent to the buffer 10 to prevent the first processing unit 20 from continuing to store the data in the buffer 10 when the processing units 22 and 24 of the system are unable to process the data in the buffer 10 to overwrite the original data in the buffer 10 and lose it. As shown in step S10, when the first processing unit 20 writes data into the buffer 10, the control unit 30 will set the overwrite flag 16 of the buffer 10 to a non-overwrite parameter value, so that the buffer 10 cannot be overwritten. Write information.

The second processing unit 22 will read and process the data in the buffer 10 , and send a response message to the control unit 30 according to the status of the processed data. As shown in step S12, the control unit 30 will further execute step S14 after receiving the response message, and confirm whether the second processing unit 22 can process the data of the buffer 10 according to the response message, if the second processing unit 22 can process the buffer data, the control unit 30 will execute step S16 to set the overwrite flag 16 as the overwrite parameter value, so that the buffer 10 can overwrite the data, so that the second processing unit 22 can continue to read the data in the buffer 10 and process it.

If the response message sent by the second processing unit 22 indicates that the data cannot be processed, the control unit 30 will know according to the response message when executing step S14, and execute step S18 to detect whether there are other processing units, so as to show 3 as an example, the control unit 30 will detect that there is a third processing unit 24. At this time, the control unit 30 executes step S19, resets the buffer 10, and sends an exchange message to the third processing unit 24 to exchange the third processing unit 24 and the second processing unit 22, allowing the third processing unit 24 to read the buffer The original data of the device 10 is processed. Subsequently, step S12 and step S14 are repeatedly executed. If the third processing unit 24 can process the data in the buffer 10, proceed to step S16, and continue to step S17. If the third processing unit 24 cannot process the data, then proceed to Step S18, at this time, since the control unit 30 has not detected the existence of other processing units, as shown in step S20, it means that the system is wrong and cannot process the data of the buffer 10.

In the above-mentioned step S12, if the control unit 30 does not receive a response message, the control unit 30 will proceed to step S22 to detect whether the buffer 10 is full, because the overwrite flag is set to "false", so the buffer will be Can fill up, and buffer 10 stores data and has nothing to do with data being read by processing unit, if buffer 10 is not filled with data, then more data are written (as step S10), and confirm again and Send a response message (such as step S12). If the buffer 10 has been filled with data, the control unit 30 executes step S24 and continues to wait for a response message. Afterwards, after the control unit 30 receives the response message, it executes step S26, which is the same as the above step S14. If the response message indicates that the data in the buffer 10 can be processed, then step S16 is performed; if the response message indicates that the data in the buffer 10 cannot be processed, then step S28 is performed which is the same as step S18. If the control unit 30 detects that there is no other processing unit, as shown in step S20, it means a system error, and if there is a processing unit, then proceed to step S29, which is the same as step S19. Then step S24 is repeatedly executed.

Please refer to FIG. 7 , which is a flowchart of another preferred embodiment of the present invention. This embodiment is the processing flow after the control unit sets the overwrite flag of the buffer to overwrite the parameter value. This embodiment is also described in conjunction with FIG. 3 . Since the overwrite flag 16 of the buffer 10 is set to an overwrite parameter value, as shown in step S30 , the first processing unit 20 can write data into the buffer 10 . Afterwards, the second processing unit 22 first reads and processes the data in the buffer 10, and sends a response message according to the status of the processed data. As shown in step S32, when the control unit 30 receives the response message, it will execute step S34. If the response message indicates that the second processing unit 22 can process the data in the buffer 10, it means that the system is normal as shown in step S36. The second processing unit 22 will continue to read and process the data in the buffer 10 .

If, when the response message indicates that the second processing unit 22 cannot process the data, the control unit 30 proceeds to step S38 to detect whether there are other processing units. In this embodiment, it is detected that the third processing unit 24 exists, so the Step S39 , reset the buffer 10 and exchange the third processing unit 24 and the second processing unit 22 so that the third processing unit 24 replaces the second processing unit 22 , and repeat step S32 after the exchange is completed. Afterwards, if the third processing unit 24 also cannot process the data in the buffer 10, since there is no other processing unit in the system for exchanging, as shown in step S40, it indicates that the system is wrong.

In the above step S32, if the control unit 30 does not receive a response message continuously, the control unit 30 will detect whether the buffer 10 is filled as shown in step S42, and if the buffer 10 is not filled with data, update A lot of data is written (as in step S10), and confirm and send a response message again (as in step S12). If the buffer 10 has been filled with data, then the system is directly determined to be normal. It is because initially setting the overwrite flag 16 as an overwrite parameter value means that one of the processing units of the system can process the data of the buffer 10, so the system is directly determined to be normal. In the present invention, setting the overwrite flag as an overwrite parameter value does not necessarily need to go through the process of the fifth figure. If it is determined that the processing unit of the system can process the data in the buffer, the overwrite flag can also be directly set as an overwrite parameter. value.

In summary, the buffer reset system and method of the present invention set a reset flag on the buffer so that the two processing units can reset the buffer when they are swapped, so that the swapped processing units can be Reread data that was read by the previous processor and could not be processed. Also, the reset flag will be automatically set allowing the control unit to know if the system needs to be reset. In addition, the present invention sets an overwrite flag on the buffer. If it is uncertain whether the processor of the system can process the data in the buffer, in order to prevent the data in the buffer from being overwritten by the data written later and being lost, you can use the Set the overwrite flag to the non-overwrite parameter value, so that the buffer cannot overwrite the data until it is determined that there is a processing unit that can process the data in the buffer, and the overwrite flag will be set to the overwrite parameter, so that the buffer will behave like a normal Like a ring buffer, it can ensure that the data in the buffer will not be lost, thereby improving the performance of the buffer. If the initial state of the overwrite flag is set as an overwrite parameter, the buffer is equivalent to a circular buffer, allowing resetting and switching processing units before reading data into the buffer.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the implementation scope of the present invention. For example, all equal changes and modifications are made according to the shape, structure, characteristics and spirit described in the scope of the claims of the present invention. , should be included in the scope of the claims of the present invention.

Claims (8)

1. A buffer reset system, characterized in that it comprises: A reset flag is set on the buffer, and when the reset flag is set to a reset parameter value, the buffer is reset, and the buffer is a ring buffer; and A control unit calls a reset function, when a first processing unit reads the data of the buffer and cannot process the data of the buffer, the control unit calls the reset function to reset the buffer, so that The start pointer returns to point to the start position of the first data of the buffer, and a second processing unit is replaced to replace the first processing unit, so that the second processing unit reads and processes the data of the buffer; An overwrite flag, which is set on the buffer, and when the control unit is set to a non-overwrite parameter value, data cannot be overwritten to the buffer, and the overwrite flag is set to a by the control unit When overwriting the parameter value, the data can be overwritten to the buffer; After the first processing unit and the second processing unit read and process the data in the buffer, they will correspondingly send a response message to the control unit according to whether the data can be processed, and the control unit sets the overwrite flag, if the control unit sets the overwrite flag to the non-overwrite parameter value, when the first processing unit or the second processing unit can process the data in the buffer, the control unit sets The overwrite flag is the overwrite parameter value, so that subsequent data can be overwritten into the buffer. If the first processing unit or the second processing unit does not send the response message to the control unit, the control unit will Continue waiting for the response message to set the override flag. 2. The system according to claim 1, wherein the control unit automatically sets the reset flag to a non-reset parameter value after the exchange between the second processing unit and the first processing unit is completed, There is no need to reset the buffer. 3. The system of claim 1, wherein the control unit first detects whether the second processing unit exists before exchanging the second processing unit. 4. The system of claim 1, wherein the buffer is a ring buffer and is a first-in first-out buffer. 5. The system according to claim 1, wherein the buffer is reset so that the start pointer of the buffer returns to the start address of the buffer. 6. A method for resetting a buffer. The buffer is provided with a reset flag and an overwrite flag. When the overwrite flag is set to a non-overwrite parameter value, data cannot be overwritten to For the buffer, when the overwrite flag is set to an overwrite parameter value, data can be overwritten to the buffer, and when the reset flag is set to a reset parameter value, the buffer is reset device, the buffer is a ring buffer, characterized in that the method includes: setting the reset flag according to the status of the processing unit reading and processing the data of the buffer; Wherein, when a first processing unit reads the data of the buffer and cannot process the data of the buffer, it sets the reset flag as the reset parameter value to reset the buffer so that the start pointer returns to point to The starting position of the first data of the buffer, and after detecting whether a second processing unit exists to exchange the second processing unit with the first processing unit, the reset flag is automatically set to a non-reset parameter value, the second processing unit replaces the first processing unit to read and process the data in the buffer; Wherein, after the first processing unit and the second processing unit read and process the data in the buffer, they will correspondingly send a response message according to whether the data can be processed, so as to set the overwrite flag according to the response message , when the first processing unit or the second processing unit can process the data in the buffer after setting the overwrite flag to the non-overwrite parameter value, then set the overwrite flag to the overwrite The parameter value allows subsequent data to be overwritten to the buffer. If the first processing unit or the second processing unit does not send the response message, it continues to wait for the response message to set the overwrite flag. 7. The method of claim 6, wherein the buffer is reset, so that the initial pointer of the buffer returns to the initial address of the buffer. 8. The method of claim 6, wherein the buffer is applicable to a streaming system.

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