The Tor Browser: media/libsoundtouch/src/InterpolateShannon.h@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 ////////////////////////////////////////////////////////////////////////////////

     2 ///

     3 /// Sample interpolation routine using 8-tap band-limited Shannon interpolation

     4 /// with kaiser window.

     5 ///

     6 /// Notice. This algorithm is remarkably much heavier than linear or cubic

     7 /// interpolation, and not remarkably better than cubic algorithm. Thus mostly

     8 /// for experimental purposes

     9 ///

    10 /// Author        : Copyright (c) Olli Parviainen

    11 /// Author e-mail : oparviai 'at' iki.fi

    12 /// SoundTouch WWW: http://www.surina.net/soundtouch

    13 ///

    14 ////////////////////////////////////////////////////////////////////////////////

    15 //

    16 // $Id: InterpolateShannon.h 179 2014-01-06 18:41:42Z oparviai $

    17 //

    18 ////////////////////////////////////////////////////////////////////////////////

    19 //

    20 // License :

    21 //

    22 //  SoundTouch audio processing library

    23 //  Copyright (c) Olli Parviainen

    24 //

    25 //  This library is free software; you can redistribute it and/or

    26 //  modify it under the terms of the GNU Lesser General Public

    27 //  License as published by the Free Software Foundation; either

    28 //  version 2.1 of the License, or (at your option) any later version.

    29 //

    30 //  This library is distributed in the hope that it will be useful,

    31 //  but WITHOUT ANY WARRANTY; without even the implied warranty of

    32 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    33 //  Lesser General Public License for more details.

    34 //

    35 //  You should have received a copy of the GNU Lesser General Public

    36 //  License along with this library; if not, write to the Free Software

    37 //  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    38 //

    39 ////////////////////////////////////////////////////////////////////////////////

    41 #ifndef _InterpolateShannon_H_

    42 #define _InterpolateShannon_H_

    44 #include "RateTransposer.h"

    45 #include "STTypes.h"

    47 namespace soundtouch

    48 {

    50 class InterpolateShannon : public TransposerBase

    51 {

    52 protected:

    53     void resetRegisters();

    54     int transposeMono(SAMPLETYPE *dest,

    55                         const SAMPLETYPE *src,

    56                         int &srcSamples);

    57     int transposeStereo(SAMPLETYPE *dest,

    58                         const SAMPLETYPE *src,

    59                         int &srcSamples);

    60     int transposeMulti(SAMPLETYPE *dest,

    61                         const SAMPLETYPE *src,

    62                         int &srcSamples);

    64     float fract;

    66 public:

    67     InterpolateShannon();

    68 };

    70 }

    72 #endif

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