Video decoder with reduced dynamic range transform with inverse transform shifting memory

An apparatus for decoding video, the apparatus comprising:

• one or more processors;
• and
• one or more storage devices storing instructions that, when executed by the one or more processors, cause the one or more processors to perform operations comprising:
• receiving quantized coefficients representative of a block of video representative of a plurality of pixels;
• descaling the quantized coefficients to generate descaled coefficients;
• applying an adjustment to the descaled coefficients to generate adjusted descaled coefficients;
• clipping the adjusted descaled coefficients to a predetermined bit depth to generate clipped coefficients;
• one-dimensional inverse transforming the clipped coefficients in a first direction to generate first direction inverse transformed coefficients;
• shifting the first direction inverse transformed coefficients to generate shifted coefficients;
• clipping the shifted coefficients to the predetermined bit depth to generate second clipped coefficients;
• and
• one-dimensional inverse transforming the second clipped coefficients in a second direction to determine a decoded residue,
• wherein the shifting is performed after the one-dimensional inverse transforming in the first direction and prior to the one-dimensional inverse transforming in the second direction.