apps/codecs/libspeex/lsp.h

   1 /*---------------------------------------------------------------------------*\
   2 Original Copyright
   3         FILE........: AK2LSPD.H
   4         TYPE........: Turbo C header file
   5         COMPANY.....: Voicetronix
   6         AUTHOR......: James Whitehall
   7         DATE CREATED: 21/11/95
   8
   9 Modified by Jean-Marc Valin
  10
  11     This file contains functions for converting Linear Prediction
  12     Coefficients (LPC) to Line Spectral Pair (LSP) and back. Note that the
  13     LSP coefficients are not in radians format but in the x domain of the
  14     unit circle.
  15
  16 \*---------------------------------------------------------------------------*/
  17 /**
  18    @file lsp.h
  19    @brief Line Spectral Pair (LSP) functions.
  20 */
  21 /* Speex License:
  22
  23    Redistribution and use in source and binary forms, with or without
  24    modification, are permitted provided that the following conditions
  25    are met:
  26
  27    - Redistributions of source code must retain the above copyright
  28    notice, this list of conditions and the following disclaimer.
  29
  30    - Redistributions in binary form must reproduce the above copyright
  31    notice, this list of conditions and the following disclaimer in the
  32    documentation and/or other materials provided with the distribution.
  33
  34    - Neither the name of the Xiph.org Foundation nor the names of its
  35    contributors may be used to endorse or promote products derived from
  36    this software without specific prior written permission.
  37
  38    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  39    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  40    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  41    A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
  42    CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  43    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  44    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  45    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  46    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  47    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  48    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  49 */
  50
  51 #ifndef __AK2LSPD__
  52 #define __AK2LSPD__
  53
  54 #include "arch.h"
  55
  56 int lpc_to_lsp (spx_coef_t *a, int lpcrdr, spx_lsp_t *freq, int nb, spx_word16_t delta, char *stack);
  57 void lsp_to_lpc(spx_lsp_t *freq, spx_coef_t *ak, int lpcrdr, char *stack);
  58
  59 /*Added by JMV*/
  60 void lsp_enforce_margin(spx_lsp_t *lsp, int len, spx_word16_t margin);
  61
  62 void lsp_interpolate(spx_lsp_t *old_lsp, spx_lsp_t *new_lsp, spx_lsp_t *interp_lsp, int len, int subframe, int nb_subframes);
  63
  64 #endif  /* __AK2LSPD__ */