Signaling for addition or removal of layers in scalable video

1. A method of signaling individual layers in a video stream, in response to a request from a decoder, the method comprising:

(a) determining a plurality of layers in said video stream, wherein each layer includes a respective parameter setting, wherein said plurality of layers and respective parameter settings are pre-encoded in said video stream;

(b) determining an additional layer not included in said pre-encoded for the plurality of layers in the video stream, wherein the additional layer enhances one or more of the plurality of layers including a base layer and the respective layer parameter settings for the plurality of layers do not take into account the additional layer;

(c) determining an additional parameter setting for the additional layer in response to said request from said decoder, the additional parameter setting specifying a relationship between the additional layer and at least a portion of the plurality of layers, wherein the additional parameter setting is used to decode the additional layer;

(d) signaling in at least one descriptor carrying syntax elements in said video stream a parameter setting for each of said plurality of layers including said additional layer;

(e) signaling in said at least one descriptor an operation point that identifies said additional layer;

(f) signaling in an extension descriptor to said at least one descriptor at least one additional stream setting for said additional layer, said at least one additional layer setting including a hierarchy parameter indexing a dependency between said additional layer and at least a portion of said plurality of layers.

2. The method of claim 1 , further comprising sending the additional layer and the at least a portion of the plurality of layers with each respective parameter setting and the additional parameter setting to a decoder.

3. The method of claim 1 , wherein the additional parameter setting is included in a video descriptor in the video stream.

4. The method of claim 1 , wherein the respective parameter settings for each of the plurality of layers are included in a video descriptor in the video stream.

5. The method of claim 1 , further comprising setting a parameter in the video stream indicating that additional layers may be added to the at least a portion of the plurality of layers.

6. The method of claim 5 , wherein the parameter in the video stream indicates that the additional parameter setting will be included in the video stream.

7. The method of claim 1 , wherein the additional parameter setting specifies layer specific information for the additional layer.

8. The method of claim 1 , wherein the additional parameter setting specifies layer dependent information for the additional layer and the at least a portion of the plurality of layers.

9. The method of claim 1 , wherein the additional parameter setting includes a maximum bit rate for the additional layer and the at least a portion of the plurality of layers.

10. The method of claim 1 , wherein the additional parameter setting includes a maximum buffer size for the additional layer and the at least a portion of the plurality of layers.

11. The method of claim 1 , wherein the video stream comprises HEVC, scalable HEVC (SHVC), multiview HEVC (MV HEVC), or combinations thereof.