Picture interdependencies signals in context of MMCO to assist stream manipulation
In one embodiment, a method that provides tier information corresponding to a picture, the tier information provided in an adaptation field of a transport packet, the transport packet comprising a first byte of a header of a packetized elementary stream (PES) containing the picture; and provides the first transport packet.
1. A method, comprising:
receiving an encoded video stream with a first picture, a second picture, and a third picture, wherein the encoded first picture includes a memory management control operation (MMCO), wherein decoding of the third picture depends on processing the MMCO;
effecting the issuance by the first picture the MMCO during a first playback mode, the first picture processed but not decoded, wherein the encoded first picture is a non-reference picture, the first picture containing a first byte conveying the minimum number of independently decodable pictures per a defined time period, irrespective of a given trick mode speed;
signal the first picture as a reference picture;
effect issuance of the MMCO command with the first picture marked as a reference picture; and
processing and decoding the first picture during a second playback mode, wherein the MMCO issued by the first picture affects referencing of the second picture by the third picture, the first picture different than the second picture and the third picture, the second picture different than the third picture, wherein the third picture comprises a lower numbered tier than the second picture, wherein at least three tiers are available and wherein at least a fourth picture has the same tier number as the second picture.
2. The method of claim 1 , wherein the second picture comprises a reference picture to the third picture.
3. The method of claim 1 , wherein the first playback mode comprises a trick mode.
4. The method of claim 1 , wherein the second playback mode comprises a normal playback mode.
5. The method of claim 1 , further comprising referencing by the third picture the first picture, the third picture comprising a tier number no lower than the tier number of the first picture.
6. A method, comprising: providing a picture containing a first byte conveying the minimum number of independently decodable pictures per a defined time period, irrespective of a given trick mode speed; providing tier information corresponding to the picture, the tier information provided in an adaptation field of a transport packet, the transport packet comprising a first byte of a header of a packetized elementary stream (PES) containing the picture, the tier information indicating a plurality of tiers, wherein the tier information is configured to signal a number of independently decodable pictures per second for a defined trick mode speed; and providing the first transport packet, where providing the first transport packet will effect issuance of a MMCO command with a first picture marked as a reference picture, wherein the MMCO issued by the first picture affects referencing of a second picture by a third picture, the first picture different than the second picture and the third picture.
7. The method of claim 6 , wherein a first byte of a payload of the transport packet corresponds to the first byte of the header of the PES packet.
8. The method of claim 6 , wherein a first byte of a payload of the transport packet corresponds to a first byte corresponding to the picture.
9. The method of claim 6 , further comprising providing a pointer to a next picture in a compressed video stream, the next picture and the picture comprising a same tier number.
10. A headend system, comprising: a processor configured to provide a data field in an adaptation field of a transport packet, where the transport packet will effect issuance of a MMCO command with a first picture marked as a reference picture, wherein the MMCO issued by the first picture affects referencing of a second picture by a third picture, the first picture different than the second picture and the third picture, the data field further comprising: a first information configured to signal one of a plurality of non-unique tier numbers corresponding to a first picture; a second information configured to signal whether the first picture issues a memory management control operation (MMCO) command, wherein the first picture contains a first byte conveying the minimum number of independently decodable pictures per a defined time period, irrespective of a given trick mode speed; and a third information configured to signal whether the first information is ordered according to an increasing or decreasing order.
11. The system of claim 10 , wherein the first information is ordered based on increasing or decreasing tier number.
12. The system of claim 10 , wherein the data field further comprises a fourth information configured to signal an identification of a subsequent picture corresponding to a same tier number as the tier number of the picture.
13. The system of claim 12 , wherein the identification comprises a location relative to the picture.
14. The system of claim 12 , wherein the fourth information is further configured to signal an absence of an identification of the subsequent picture.
15. The system of claim 10 , wherein the data field further comprises a fifth information configured to signal an identification of a forward predicted picture.
16. The system of claim 10 , wherein the processor is further configured to: signal a non-reference picture as a reference picture; and effect issuance of an MMCO command with the non-reference picture marked as a reference picture.
17. The system of claim 10 , wherein the data field further comprises a sixth information configured to signal a number of independently decodable pictures per second for a defined trick mode speed.
18. The system of claim 17 , wherein the data field further comprises a parameter corresponding to at least one trick mode speed.