Modified Discrete Cosine Transform Functions

This section describes Intel IPP functions that compute the modified discrete cosine transform (MDCT) of a signal. MDCT is a lapped orthogonal transform widely used in different audio codecs, such as MPEG-1, MPEG-2, AC-3, and AAC.

The use of the functions described in this section is demonstrated in Intel® IPP Samples downloadable from http://www.intel.com/cd/software/products/asmo-na/eng/220046.htm.

• MDCTFwdInitAlloc, MDCTInvInitAlloc
  Create and initialize modified discrete cosine transform specification structure.
• MDCTFwdInit, MDCTInvInit
  Initialize modified discrete cosine transform specification structure.
• MDCTFwdFree, MDCTInvFree
  Closes modified discrete cosine transform specification structure.
• MDCTFwdGetSize, MDCTInvGetSize
  Get the sizes of MDCT specification structure, MDCT initialization, and MDCT work buffer.
• MDCTFwdGetBufSize, MDCTInvGetBufSize
  Gets the size of MDCT work buffer.
• MDCTFwd, MDCTInv
  Computes forward or inverse modified discrete cosine transform (MDCT) of a signal.

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