apps/codecs/libmusepack/requant.h

   1 /*
   2   Copyright (c) 2005, The Musepack Development Team
   3   All rights reserved.
   4
   5   Redistribution and use in source and binary forms, with or without
   6   modification, are permitted provided that the following conditions are
   7   met:
   8
   9   * Redistributions of source code must retain the above copyright
  10   notice, this list of conditions and the following disclaimer.
  11
  12   * Redistributions in binary form must reproduce the above
  13   copyright notice, this list of conditions and the following
  14   disclaimer in the documentation and/or other materials provided
  15   with the distribution.
  16
  17   * Neither the name of the The Musepack Development Team nor the
  18   names of its contributors may be used to endorse or promote
  19   products derived from this software without specific prior
  20   written permission.
  21
  22   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  25   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  26   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  27   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  28   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  29   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  30   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  32   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33 */
  34
  35 /// \file requant.h
  36 /// Requantization function definitions.
  37
  38 #ifndef _mpcdec_requant_h
  39 #define _mpcdec_requant_h_
  40
  41 #include "musepack.h"
  42
  43 /* C O N S T A N T S */
  44 extern const mpc_uint32_t       Res_bit[18]; // bits per sample for chosen quantizer
  45 extern const MPC_SAMPLE_FORMAT __Cc[1 + 18]; // coefficients for requantization
  46 extern const mpc_int32_t       __Dc[1 + 18]; // offset for requantization
  47 extern const mpc_int32_t          idx30[27]; // 1st value of bundled 3-step quantizer
  48 extern const mpc_int32_t          idx31[27]; // 2nd value of bundled 3-step quantizer
  49 extern const mpc_int32_t          idx32[27]; // 3rd value of bundled 3-step quantizer
  50 extern const mpc_int32_t          idx50[25]; // 1st value of bundled 5-step quantizer
  51 extern const mpc_int32_t          idx51[25]; // 2nd value of bundled 5-step quantizer
  52
  53
  54 #define Cc      (__Cc + 1)
  55 #define Dc      (__Dc + 1)
  56
  57 #endif // _mpcdec_requant_h_