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1  /************************************************************************
2   * Copyright (C) 2002-2009, Xiph.org Foundation
3   * Copyright (C) 2010, Robin Watts for Pinknoise Productions Ltd
4   * All rights reserved.
5   *
6   * Redistribution and use in source and binary forms, with or without
7   * modification, are permitted provided that the following conditions
8   * are met:
9   *
10   *     * Redistributions of source code must retain the above copyright
11   * notice, this list of conditions and the following disclaimer.
12   *     * Redistributions in binary form must reproduce the above
13   * copyright notice, this list of conditions and the following disclaimer
14   * in the documentation and/or other materials provided with the
15   * distribution.
16   *     * Neither the names of the Xiph.org Foundation nor Pinknoise
17   * Productions Ltd nor the names of its contributors may be used to
18   * endorse or promote products derived from this software without
19   * specific prior written permission.
20   *
21   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32   ************************************************************************
33  
34   function: modified discrete cosine transform prototypes
35  
36   ************************************************************************/
37  
38  #ifndef _OGG_mdct_H_
39  #define _OGG_mdct_H_
40  
41  #include "ivorbiscodec.h"
42  #include "misc.h"
43  
44  #define DATA_TYPE ogg_int32_t
45  #define REG_TYPE  register ogg_int32_t
46  
47  #ifdef _LOW_ACCURACY_
48  #define cPI3_8 (0x0062)
49  #define cPI2_8 (0x00b5)
50  #define cPI1_8 (0x00ed)
51  #else
52  #define cPI3_8 (0x30fbc54d)
53  #define cPI2_8 (0x5a82799a)
54  #define cPI1_8 (0x7641af3d)
55  #endif
56  
57  extern void mdct_backward(int n, DATA_TYPE *in);
58  extern void mdct_shift_right(int n, DATA_TYPE *in, DATA_TYPE *right);
59  extern void mdct_unroll_lap(int n0,int n1,
60  			    int lW,int W,
61  			    DATA_TYPE *in,DATA_TYPE *right,
62  			    LOOKUP_T *w0,LOOKUP_T *w1,
63  			    ogg_int16_t *out,
64  			    int step,
65  			    int start,int end /* samples, this frame */);
66  
67  #endif
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