Abstract: A video coder may be configured to code a chroma block of video data as a function of reconstructed luma samples. The video coder may store, during the prediction process for a luma block, a sum of the reconstructed luma sample values for each sub-block of the luma block in a first buffer, and store, during the prediction process for the luma block, an average of the reconstructed luma sample values in a second buffer. The video coder may perform chroma from luma prediction to reconstruct a chroma block of the video data corresponding to the luma block using the sums and the average.

Abstract: A device for decoding video data includes a memory configured to store video data; and one or more processors implemented in circuitry and configured to: determine that a current block of the video data is to be predicted using an angular intra-prediction mode; determine neighboring samples to the current block that will be used to generate a prediction block for the current block according to an angle of the angular intra-prediction mode and that are to be upsampled; calculate predicted samples of the prediction block according to formulas that jointly upsample the neighboring samples that will be used to generate the prediction block and that generate the values for the predicted samples; and decode the current block using the prediction block.

Abstract: A device for decoding video data includes a memory configured to store video data; and one or more processors implemented in circuitry and configured to: determine that a current block of the video data is to be predicted using an angular intra-prediction mode; determine neighboring samples to the current block that will be used to generate a prediction block for the current block according to an angle of the angular intra-prediction mode and that are to be upsampled; calculate predicted samples of the prediction block according to formulas that jointly upsample the neighboring samples that will be used to generate the prediction block and that generate the values for the predicted samples; and decode the current block using the prediction block.

Abstract: A video coder may be configured code a chroma block of video data as a function of reconstructed luma samples. The video coder may store, during the prediction process for a luma block, a sum of the reconstructed luma sample values for each sub-block of the luma block in a first buffer, and store, during the prediction process for the luma block, an average of the reconstructed luma sample values in a second buffer. The video coder may perform chroma from luma prediction to reconstruct a chroma block of the video data corresponding to the luma block using the sums and the average.

Abstract: A video coder may be configured code a chroma block of video data as a function of reconstructed luma samples. The video coder may store, during the prediction process for a luma block, a sum of the reconstructed luma sample values for each sub-block of the luma block in a first buffer, and store, during the prediction process for the luma block, an average of the reconstructed luma sample values in a second buffer. The video coder may perform chroma from luma prediction to reconstruct a chroma block of the video data corresponding to the luma block using the sums and the average.