Joonas Rikkonen
126 lines
4.6 KiB
C#
126 lines
4.6 KiB
C#
/* Copyright (c) 2007-2008 CSIRO
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Copyright (c) 2007-2011 Xiph.Org Foundation
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Originally written by Jean-Marc Valin, Gregory Maxwell, Koen Vos,
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Timothy B. Terriberry, and the Opus open-source contributors
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Ported to C# by Logan Stromberg
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of Internet Society, IETF or IETF Trust, nor the
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names of specific contributors, may be used to endorse or promote
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products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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using Concentus.Celt;
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using Concentus.Common;
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using Concentus.Common.CPlusPlus;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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namespace Concentus
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{
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internal static class Downmix
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{
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/// <summary>
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///
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/// </summary>
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/// <typeparam name="T">The type of signal being handled (either short or float)</typeparam>
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/// <param name="_x"></param>
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/// <param name="sub"></param>
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/// <param name="subframe"></param>
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/// <param name="offset"></param>
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/// <param name="c1"></param>
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/// <param name="c2"></param>
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/// <param name="C"></param>
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public delegate void downmix_func<T>(T[] _x, int x_ptr, int[] sub, int sub_ptr, int subframe, int offset, int c1, int c2, int C);
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internal static void downmix_float(float[] x, int x_ptr, int[] sub, int sub_ptr, int subframe, int offset, int c1, int c2, int C)
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{
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int scale;
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int j;
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int c1x = c1 + x_ptr;
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for (j = 0; j < subframe; j++)
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sub[sub_ptr + j] = Inlines.FLOAT2INT16(x[(j + offset) * C + c1x]);
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if (c2 > -1)
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{
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int c2x = c2 + x_ptr;
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for (j = 0; j < subframe; j++)
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sub[sub_ptr + j] += Inlines.FLOAT2INT16(x[(j + offset) * C + c2x]);
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}
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else if (c2 == -2)
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{
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int c;
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int cx;
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for (c = 1; c < C; c++)
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{
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cx = c + x_ptr;
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for (j = 0; j < subframe; j++)
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sub[sub_ptr + j] += Inlines.FLOAT2INT16(x[(j + offset) * C + cx]);
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}
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}
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scale = (1 << CeltConstants.SIG_SHIFT);
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if (C == -2)
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scale /= C;
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else
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scale /= 2;
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for (j = 0; j < subframe; j++)
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sub[sub_ptr + j] *= scale;
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}
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internal static void downmix_int(short[] x, int x_ptr, int[] sub, int sub_ptr, int subframe, int offset, int c1, int c2, int C)
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{
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int scale;
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int j;
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for (j = 0; j < subframe; j++)
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sub[j + sub_ptr] = x[(j + offset) * C + c1];
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if (c2 > -1)
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{
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for (j = 0; j < subframe; j++)
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sub[j + sub_ptr] += x[(j + offset) * C + c2];
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}
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else if (c2 == -2)
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{
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int c;
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for (c = 1; c < C; c++)
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{
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for (j = 0; j < subframe; j++)
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sub[j + sub_ptr] += x[(j + offset) * C + c];
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}
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}
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scale = (1 << CeltConstants.SIG_SHIFT);
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if (C == -2)
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scale /= C;
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else
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scale /= 2;
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for (j = 0; j < subframe; j++)
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sub[j + sub_ptr] *= scale;
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}
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}
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}
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