Mode uniformity signaling for intra-coding

1. A method for encoding a macroblock, the macroblock comprising a plurality of pixel values and a plurality of sub-partition blocks, each sub-partition block comprising a subset of the plurality of pixel values, the method comprising:

selecting for a plurality of subsets of the sub-partition blocks of the macroblock a prediction mode defining a prediction direction for predicting pixels for each of the sub-partition blocks of each of the subsets based on neighboring pixels;

providing a plurality of mode uniformity indicators for the macroblock, each of the mode uniformity indicators indicating for a particular one of the subsets of the sub-partition blocks whether all sub-partition blocks in the particular one of the subsets macroblock are to be predicted according to the same selected prediction mode and the same prediction direction for each of the sub-partition blocks in the particular one of the subsets, wherein a first one of the plurality of mode uniformity indicators indicates whether all of the sub-partition blocks in a first one of the subsets of the sub-partition blocks are to be predicted according to a first prediction mode and a first prediction direction and wherein a second one of the plurality of mode uniformity indicators indicates whether all of the sub-partition blocks in a second one of the subsets of the sub-partition blocks are to be predicted according to a second selected prediction mode and a second prediction direction; and

predicting the sub-partition blocks of each of the subsets of the macroblock according to the same prediction mode and the same prediction direction selected for each of the subsets so as to predict the plurality of pixel values of the macroblock.

2. The method of claim 1 , wherein the each of the mode uniformity indicators is a mode uniformity bit.

3. The method of claim 1 , the each sub-partition block comprising 4×4 pixels, the macroblock comprising 16×16 pixels.

4. A method for predicting a macroblock, the macroblock comprising a plurality of pixel values and a plurality of sub-partition blocks, each sub-partition block comprising a subset of the plurality of pixel values, the method comprising:

receiving a prediction mode and a mode uniformity indicator for each of a plurality of subsets of the sub-partition blocks of the macroblock, each of the mode uniformity indicators indicating for a particular one of the subsets of the sub-partition blocks whether all sub-partition blocks in the particular one of the subsets have a same prediction mode and a same prediction direction, wherein a first one of the plurality of mode uniformity indicators indicates whether all of the sub-partition blocks in a first one of the subsets of the sub-partition blocks are to be predicted according to a first prediction mode and a first prediction direction and wherein a second one of the plurality of mode uniformity indicators indicates whether all of the sub-partition blocks in a second one of the subsets of the sub-partition blocks are to be predicted according to a second selected prediction mode and a second prediction direction; and

for each particular one of the subsets, if the mode uniformity indicator for the particular one of the subsets indicates that the all sub-partition blocks in the particular one of the subsets have the same prediction mode defining the same prediction direction, predicting the sub-partition blocks of the particular one of the subsets according to the received prediction mode and the prediction direction for the particular one of the subsets so as to predict the plurality of pixel values of the macroblock.

5. The method of claim 4 , the each of the mode uniformity indicators being a mode uniformity bit.

6. The method of claim 4 , the each sub-partition block comprising 4×4 pixels, the macroblock comprising 16×16 pixels.

7. An apparatus comprising one or more processors configured to generate an encoded macroblock, the macroblock comprising a plurality of pixel values and a plurality of sub-partition blocks, each sub-partition block comprising a subset of the plurality of pixel values, the one or more processors being further configured to:

receive a prediction mode and a mode uniformity indicator for each of a plurality of subsets of the sub-partition blocks of the macroblock, each of the mode uniformity indicators indicating whether all sub-partition blocks in a respective one of the subsets of sub-partition blocks have a same prediction mode and a same prediction direction, wherein a first one of the plurality of mode uniformity indicators indicates whether all of the sub-partition blocks in a first one of the subsets of the sub-partition blocks are to be predicted according to a first prediction mode and a first prediction direction and wherein a second one of the plurality of mode uniformity indicators indicates whether all of the sub-partition blocks in a second one of the subsets of the sub-partition blocks are to be predicted according to a second selected prediction mode and a second prediction direction; and

predict the sub-partition blocks of each of the subsets of the macroblock according to the prediction mode and the prediction direction for each of the subsets so as to predict the plurality of pixel values of the macroblock.

8. The apparatus of claim 7 , wherein the each of the mode uniformity indicators is a mode uniformity bit.

9. The apparatus of claim 7 , the each sub-partition block comprising 4×4 pixels, the macroblock comprising 16×16 pixels.

10. The apparatus of claim 7 , wherein the apparatus is an integrated circuit.

11. An apparatus for predicting a macroblock, the macroblock comprising a plurality of pixel values and a plurality of sub-partition blocks, each sub-partition block comprising a subset of the plurality of pixel values, the apparatus comprising one or more processors configured to receive a prediction mode and a mode uniformity indicator for each of a plurality of subsets of the sub-partition blocks of the macroblock, each of the mode uniformity indicators indicating whether all sub-partition blocks in a respective one of the subsets of sub-partition blocks have a same prediction mode and a same prediction direction, wherein a first one of the plurality of mode uniformity indicators indicates whether all of the sub-partition blocks in a first one of the subsets of the sub-partition blocks are to be predicted according to a first prediction mode and a first prediction direction and wherein a second one of the plurality of mode uniformity indicators indicates whether all of the sub-partition blocks in a second one of the subsets of the sub-partition blocks are to be predicted according to a second selected prediction mode and a second prediction direction; and the one or more processors being further configured to, for each particular one of the subsets, if the mode uniformity indictor for the particular one of the subsets indicates that the all sub-partition blocks in the particular one of the subsets are to be predicted according to the same prediction mode, predict all sub-partition blocks of the particular one of the subsets according to the received prediction mode and the same prediction direction for the particular one of the subsets so as to predict the plurality of pixel values of the macroblock.

12. An apparatus for predicting a macroblock, the macroblock comprising a plurality of pixel values and a plurality of sub-partition blocks, each sub-partition block comprising a subset of the plurality of pixel values, the apparatus comprising one or more processors configured to receive a prediction mode defining a prediction direction and a mode uniformity indicator for the macroblock, the mode uniformity indicator indicating whether all sub-partition blocks in the macroblock have a same prediction mode and a same prediction direction, the one or more processors being further configured to, if the mode uniformity indictor indicates that the all sub-partition blocks in the macroblock are to be predicted according to the same prediction mode, predict all sub-partition blocks of the macroblock according to the received prediction mode and the same prediction direction so as to predict the plurality of pixel values of the macroblock.

13. The apparatus of claim 12 , the each of the mode uniformity indicators being a mode uniformity bit.

14. The apparatus of claim 12 , the each sub-partition block comprising 4×4 pixels, the macroblock comprising 16×16 pixels.

15. The apparatus of claim 12 , wherein the apparatus is an integrated circuit.

16. The apparatus of claim 12 , wherein the apparatus is a handset.

17. A computer program product for predicting a macroblock, the macroblock comprising a plurality of pixel values and a plurality of sub-partition blocks, each sub-partition block comprising a subset of the plurality of pixel values, the product comprising:

a non-transitory computer-readable medium storing computer-executable code that, when executed by a computer, causes the computer to:

receive a prediction mode and a mode uniformity indicator for each of a plurality of subsets of the sub-partition blocks of the macroblock, the mode uniformity indicators indicating whether all sub-partition blocks in the subset of sub-partition blocks have a same prediction mode and a same prediction direction, wherein a first one of the plurality of mode uniformity indicators indicates whether all of the sub-partition blocks in a first one of the subsets of the sub-partition blocks are to be predicted according to a first prediction mode and a first prediction direction and wherein a second one of the plurality of mode uniformity indicators indicates whether all of the sub-partition blocks in a second one of the subsets of the sub-partition blocks are to be predicted according to a second selected prediction mode and a second prediction direction; and

for each particular one of the subsets, if the mode uniformity indicator for the particular one of the subsets indicates that the all sub-partition blocks in the particular one of the subsets have the same prediction mode defining the same prediction direction, predict the sub-partition blocks of the particular one of the subsets according to the received prediction mode and the prediction direction for the particular one of the subsets so as to predict the plurality of pixel values of the macroblock.

18. The computer program product of claim 17 , each of the mode uniformity indicators being a mode uniformity bit.

19. The computer program product of claim 17 , the each sub-partition block comprising 4×4 pixels, the macroblock comprising 16×16 pixels.

20. The computer program product of claim 17 , wherein the product is a handset.

21. An apparatus configured to generate an encoded macroblock, the macroblock comprising a plurality of pixel values and a plurality of sub-partition blocks, each sub-partition block comprising a subset of the plurality of pixel values, the apparatus comprising:

means for receiving a prediction mode and a mode uniformity indicator for each of a plurality of subsets of the sub-partition blocks of the macroblock, each of the mode uniformity indicators indicating whether all sub-partition blocks in a respective one of the subsets of sub-partition blocks have a same prediction mode and a same prediction direction, wherein a first one of the plurality of mode uniformity indicators indicates whether all of the sub-partition blocks in a first one of the subsets of the sub-partition blocks are to be predicted according to a first prediction mode and a first prediction direction and wherein a second one of the plurality of mode uniformity indicators indicates whether all of the sub-partition blocks in a second one of the subsets of the sub-partition blocks are to be predicted according to a second selected prediction mode and a second prediction direction; and

means for predicting the sub-partition blocks of each of the subsets of the macroblock according to the prediction mode and the prediction direction for each of the subsets so as to predict the plurality of pixel values of the macroblock.