System and method for providing personal video recording trick modes
Systems and methods that provide personal video recording trick modes are provided. In one example, a method that provides a trick mode in a personal video recording system may include the steps of receiving a transport stream; storing data from the transport stream in a data storage; generating index table using the data from the transport stream; receiving a trick mode command; and accessing, based on the trick mode command, particular data in the data storage using the index table.
1. A method for providing a trick mode in a personal video recording (PVR) system, the method comprising:
in response to receiving a trick mode command:
retrieving a first frame from a data storage;
decoding the first frame;
refraining from displaying the decoded first frame based at least in part on the trick mode command;
retrieving a second frame from the data storage; and
decoding the second frame using the first frame.
2. The method according to claim 1 , further comprising displaying the second frame.
3. The method according to claim 1 ,
wherein the first frame comprises an I-frame, and
wherein the second frame comprises a P-frame.
4. The method according to claim 1 , wherein the trick mode command comprises a command to decode the second frame.
5. The method according to claim 1 , wherein the first frame comprises at least one of a third frame and a fourth frame.
6. The method according to claim 5 ,
wherein the third frame comprises an I-frame,
wherein the fourth frame comprises a P-frame, and
wherein the second frame comprises a B-frame.
7. A method for entering a trick mode in a personal video recording (PVR) system, comprising:
directing a data transport engine of the PVR system to halt feeding video data into a video decoder of the PVR system; and
after the data transport engine halts feeding video data into the video decoder of the PVR system:
directing the video decoder to read a time stamp from a last displayed picture;
flushing a video buffer of the video decoder; and
selecting particular pictures for display using an index table stored in the PVR system and the read time stamp.
8. The method according to claim 7 , further comprising:
directing the video decoder to operate with a timebase management mode disabled;
generating a video stream from the selected pictures; and
displaying the generated video stream with the timebase management mode disabled.
9. The method according to claim 7 , further comprising:
directing the video decoder to operate with a continuity counter disabled;
generating a video stream from the selected pictures; and
displaying the generated video stream with the continuity counter disabled.
10. A method for providing a trick mode in a personal video recording (PVR) system, comprising:
receiving a trick mode command;
determining a requested speed from the trick mode command;
if the requested speed is less than real time speed, then configuring a video decoder to decode one frame for each X vertical synchronization pulses, where X is a positive number greater than one; and
if the requested speed is not less than real time speed, then configuring the video decoder to decode Y frames for each vertical synchronization pulse, where Y is a positive number greater than one.
11. The method according to claim 10 , wherein the trick mode is a decoder trick mode.
12. The method according to claim 10 , wherein the video decoder provides approximately 1/X-times slow motion.
13. The method according to claim 10 , wherein the video decoder provides approximately Y-times smooth fast forward.
14. The method according to claim 10 , further comprising configuring the video decoder to decode without utilizing a timebase management mode.
15. The method according to claim 14 , further comprising monitoring for timebase discontinuities with a host processor of the PVR system.
16. The method according to claim 10 , further comprising inserting special transport packets containing configuration information for the video decoder.
17. The method of claim 10 , further comprising displaying top fields only.
18. A personal video recording (PVR) system comprising at least one component operable to, at least:
retrieve a first frame from a data storage in response to a received trick mode command;
decode the retrieved first frame;
refrain from displaying the decoded first frame based at least in part on the received trick mode command;
retrieve a second frame from the data storage; and
decode the second frame using the first frame.
19. A personal video recording (PVR) system comprising at least one component operable to, at least:
direct a data transport engine of the PVR system to halt feeding video data into a video decoder of the PVR system; and
after the data transport engine halts feeding video data into the video decoder of the PVR system:
direct the video decoder to read a time stamp from a last displayed picture;
flush a video buffer of the video decoder; and
select particular pictures for display using an index table stored in the PVR system and the read time stamp.
20. A personal video recording (PVR) system comprising at least one component operable to, at least:
receive a trick mode command;
determine a requested speed from the trick mode command;
if the requested speed is less than real time speed, then configure a video decoder to decode one frame for each X vertical synchronization pulses, where X is a positive number greater than one; and
if the requested speed is not less than real time speed, then configure the video decoder to decode Y frames for each vertical synchronization pulse, where Y is a positive number greater than one.