Method and apparatus for gradually degrading video data

• US 5,392,396 A
• Filed: 03/28/1994
• Issued: 02/21/1995
• Est. Priority Date: 10/23/1992
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: MacInnis, Alexander G.
• Primary Examiner(s): Powell, Mark R.
• Assistant Examiner(s): CHAUHAN, ULKA J
• Application Number:
  US08/219,226
• Time in Patent Office: 330 Days
• Field of Search: 345/185, 345/190, 345/196, 345/200, 345/189, 395/152, 395/154, 395/164, 395/162, 395/165, 395/166, 395/425, 364/238.4, 364/242.91, 364/246.91, 364/255.1, 364/256.8, 364/926.2, 364/926.4, 364/926.92, 364/955
• US Class Current: 345/543
• CPC Class Codes: G06F 3/14 Digital output to display device ; Cooperation and interconnection of the display device with other functional units
• CPC Class Codes: G09G 2360/04 Display device controller operating with a plurality of display units
• CPC Class Codes: G09G 5/393 Arrangements for updating the contents of the bit-mapped memory

Abstract

A method of transmitting frames of video data to be displayed including the steps of receiving at least a portion of a frame of video data, determining whether the received video data can be stored in a buffer, storing the received video data in a buffer if the received video data can be stored in the buffer, and erasing any video data of the frame of video data if the received video data cannot be stored in the buffer. In addition, an apparatus for transmitting frames of video data to be displayed including an apparatus for receiving at least a portion of a frame of video data, an apparatus for determining whether the received video data can be stored in a buffer, an apparatus for storing the received video data in the buffer if the received video data can be stored in the buffer, and an apparatus for erasing any video data of the frame of video data if the received video data cannot be stored in the buffer.

Claims

1. A method of transmitting frames of video data to be displayed comprising the steps of:

a) receiving at least a portion of a frame of video data;

b) determining whether a buffer has sufficient available space to store the received video data;

c) storing the received video data in the buffer if the buffer has been determined to have sufficient available space to store the received video data; and

d) erasing the received video data and any other portions of the frame of video data when other portions of the frame of video data are received if the buffer has been determined to not have sufficient available space to store the received video data such that the frame of video data is not displayed even if buffer space is available for the other portions of the frame of video data.

2. The method of claim 1 wherein the step of storing includes storing the received video data in a queued buffer and updating a pointer to the queued buffer.

3. The method of claim 2 wherein the step of erasing includes moving the pointer to a location in the queued buffer prior to the received video data.

4. The method of claim 3 further comprising a step of displaying the received video data stored in the buffer.

5. The method of claim 4 further comprising a step of transmitting the received video data to a display adapter prior to display of the received video data.

6. The method of claim 5 further comprising a step of digitizing the received video data.

24. The method of claim 1 wherein the step of storing includes not storing any other video data from the frame of the received video data that has been erased.

7. An apparatus for transmitting frames of video data to be displayed comprising:

a) means for receiving at least a portion of a frame of video data;

b) means for determining whether a buffer has sufficient available space to store the received video data;

c) means for storing the received video data in the buffer if the buffer has been determined to have sufficient available space to store the received video data; and

d) means for erasing the received video data and any other portions of the frame of video data when other portions of the frame of video data are received if the buffer has been determined to not have sufficient available space to store the received video data such that the frame of video data is not displayed even if buffer space is available for the other portions of the frame of video data.

8. The apparatus of claim 7 wherein the means for storing includes means for storing the received video data in a queued buffer and means for updating a pointer to the queued buffer.

9. The apparatus of claim 8 wherein the means for erasing includes means for moving the pointer to a location in the queued buffer prior to the received video data.

10. The apparatus of claim 9 further comprising means for displaying the received video data that has been stored in the buffer.

11. The apparatus of claim 10 further comprising means for transmitting the received video data to a display adapter prior to display of the received video data.

12. The apparatus of claim 11 further comprising means for digitizing the received video data.

25. The apparatus of claim 7 wherein the means for storing includes not storing any other video data from the frame of the received video data that has been erased.

13. A data processing system for transmitting frames of video data to be displayed comprising:

a) a processor for processing data;

b) a memory for storing data to be processed;

c) a video adapter coupled to said processor including;

i) means for receiving at least a portion of a frame of video data;

ii) means for determining whether a buffer has sufficient available space to store the received video data;

iii) means for storing the received video data in the buffer if the buffer has been determined to have sufficient available space to store the received video data; and

iv) means for erasing the received video data and any other portions of the frame of video data when other portions of the frame of video data are received if the buffer has been determined to not have sufficient available space to store the received video data such that the frame of video data is not displayed even if buffer space is available for the other portions of the frame of video data;

d) a display for displaying the received video data that has been stored in the buffer from said video adapter under direction off said processor.

14. The data processing system of claim 13 wherein the means for storing includes means for storing the received video data in a queued buffer and means for updating a pointer to the queued buffer.

15. The data processing system of claim 14 wherein the means for erasing includes means for moving the pointer to a location in the queued buffer prior to the received video data.

16. The data processing system of claim 15 further comprising means for transmitting the received video data to a display adapter prior to display of the received video data.

17. The data processing system of claim 16 further comprising means for digitizing the received video data.

26. The data processing system of claim 13 wherein the means for storing includes not storing any other video data from the frame of the received video data that has been erased.

18. A computer apparatus for allowing a data processing system to transmit frames of video data to be displayed comprising:

a) means for receiving at least a portion of a frame of video data;

b) means for determining whether a buffer has sufficient available space to store the received video data;

c) means for storing the received video data in the buffer if the buffer has been determined to have sufficient available space to store the received video data; and

d) means for erasing the received video data and any other portions of the frame of video data when other portions of the frame of video data are received if the buffer has been determined to not have sufficient available space to store the received video data such that the frame of video data is not displayed even if buffer space is available for the other portions of the frame of video data.

19. The computer apparatus of claim 18 wherein the means for storing includes means for storing the received video data in a queued buffer and means for updating a pointer to the queued buffer.

20. The computer apparatus of claim 19 wherein the means for erasing includes means for moving the pointer to a location in the queued buffer prior to the received video data.

21. The computer apparatus of claim 20 further comprising means for displaying the received video data that has been stored in the buffer.

22. The computer apparatus of claim 21 further comprising means for transmitting the received video data to a display adapter prior to display of the received video data.

23. The computer apparatus of claim 22 further comprising means for digitizing the received video data.

27. The computer apparatus of claim 18 wherein the means for storing includes not storing any other video data from a frame of the received video data that has been erased.