Computational complexity and precision control in transform-based digital media codec

COMPUTATIONAL COMPLEXITY AND PRECISION CONTROL IN TRANSFORMA-BASED DIGITAL MEDIA CODEC - A digital media encoder/decoder includes multi-mode signaling related to computational complexity and accuracy in decoding. The encoder may send a syntax element indicating the arithmetic precision (for example, using 16-bit or 32-bit operations) of the transform operations performed in decoding. The encoder can signal whether or not to scale the decoder output, which allows for a wider dynamic range of intermediate data, but adds to the computational complexity due to the scaling operation.