Apparatus and method for inter and intra mode selection and block partitioning
A hardware video encoder includes an intra search block operating on a source picture to produce pairs of intra prediction mode indices and rate-distortion values for different block sizes. The pairs of intra prediction mode indices and rate-distortion values for the different block sizes are computed in parallel based upon the source picture. An inter search block produces pairs of motion vectors and rate-distortion values for different block sizes. The pairs of motion vectors and rate-distortion values for the different block sizes are computed in parallel.
1. A hardware video encoder, comprising:
an intra search block operating on a source picture to produce intra search block output including pairs of intra prediction mode indices and rate-distortion values for different block sizes, wherein the pairs of intra prediction mode indices and rate-distortion values for the different block sizes are computed in parallel based upon the source picture, wherein the intra search block omits most probable mode computations to achieve parallelism;
an inter search block to process the intra search block output to produce inter search block output including pairs of motion vectors and rate-distortion values for different block sizes, wherein the pairs of motion vectors and rate-distortion values for the different block sizes are computed in parallel, wherein the inter search block omits motion vector prediction and merge list computations to achieve parallelism;
a selection block to process the inter search block output to produce selection block output, the selection block performing most probable mode computations, motion vector prediction and merge list computations;
a motion compensation prediction, quantization and reconstruction block to process the selection block output to produce motion compensation output; and
an entropy encoder to process the motion compensation output to produce encoder output for transmittal to a decoder.
2. The hardware video encoder of claim 1 wherein the intra search block omits processing of a reconstructed image to achieve parallelism.
3. The hardware video encoder of claim 1 wherein the intra search block only tests a subset of intra prediction modes.
4. The hardware video encoder of claim 1 wherein the intra search block computes distortion values in a transformed domain.
5. The hardware video encoder of claim 1 wherein the inter search block computes distortion values in a transformed domain.
6. The hardware video encoder of claim 1 further comprising a selection block for linearly scanning through coding units of different sizes, wherein each coding unit has pairs of intra prediction mode indices and rate-distortion values and pairs of motion vectors and rate-distortion values.
7. The hardware video encoder of claim 1 configured to use a skip coding mode when it is determined that a merge mode is applicable in a coding unit and no quantized coefficient in the coding unit is non-zero.