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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 17:32:43 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 17:32:43 +0000
commit6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch)
treea68f146d7fa01f0134297619fbe7e33db084e0aa /media/libsoundtouch/src/InterpolateCubic.cpp
parentInitial commit. (diff)
downloadthunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.tar.xz
thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.zip
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'media/libsoundtouch/src/InterpolateCubic.cpp')
-rw-r--r--media/libsoundtouch/src/InterpolateCubic.cpp196
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diff --git a/media/libsoundtouch/src/InterpolateCubic.cpp b/media/libsoundtouch/src/InterpolateCubic.cpp
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+////////////////////////////////////////////////////////////////////////////////
+///
+/// Cubic interpolation routine.
+///
+/// Author : Copyright (c) Olli Parviainen
+/// Author e-mail : oparviai 'at' iki.fi
+/// SoundTouch WWW: http://www.surina.net/soundtouch
+///
+////////////////////////////////////////////////////////////////////////////////
+//
+// License :
+//
+// SoundTouch audio processing library
+// Copyright (c) Olli Parviainen
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; either
+// version 2.1 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+//
+////////////////////////////////////////////////////////////////////////////////
+
+#include <stddef.h>
+#include <math.h>
+#include "InterpolateCubic.h"
+#include "STTypes.h"
+
+using namespace soundtouch;
+
+// cubic interpolation coefficients
+static const float _coeffs[]=
+{ -0.5f, 1.0f, -0.5f, 0.0f,
+ 1.5f, -2.5f, 0.0f, 1.0f,
+ -1.5f, 2.0f, 0.5f, 0.0f,
+ 0.5f, -0.5f, 0.0f, 0.0f};
+
+
+InterpolateCubic::InterpolateCubic()
+{
+ fract = 0;
+}
+
+
+void InterpolateCubic::resetRegisters()
+{
+ fract = 0;
+}
+
+
+/// Transpose mono audio. Returns number of produced output samples, and
+/// updates "srcSamples" to amount of consumed source samples
+int InterpolateCubic::transposeMono(SAMPLETYPE *pdest,
+ const SAMPLETYPE *psrc,
+ int &srcSamples)
+{
+ int i;
+ int srcSampleEnd = srcSamples - 4;
+ int srcCount = 0;
+
+ i = 0;
+ while (srcCount < srcSampleEnd)
+ {
+ float out;
+ const float x3 = 1.0f;
+ const float x2 = (float)fract; // x
+ const float x1 = x2*x2; // x^2
+ const float x0 = x1*x2; // x^3
+ float y0, y1, y2, y3;
+
+ assert(fract < 1.0);
+
+ y0 = _coeffs[0] * x0 + _coeffs[1] * x1 + _coeffs[2] * x2 + _coeffs[3] * x3;
+ y1 = _coeffs[4] * x0 + _coeffs[5] * x1 + _coeffs[6] * x2 + _coeffs[7] * x3;
+ y2 = _coeffs[8] * x0 + _coeffs[9] * x1 + _coeffs[10] * x2 + _coeffs[11] * x3;
+ y3 = _coeffs[12] * x0 + _coeffs[13] * x1 + _coeffs[14] * x2 + _coeffs[15] * x3;
+
+ out = y0 * psrc[0] + y1 * psrc[1] + y2 * psrc[2] + y3 * psrc[3];
+
+ pdest[i] = (SAMPLETYPE)out;
+ i ++;
+
+ // update position fraction
+ fract += rate;
+ // update whole positions
+ int whole = (int)fract;
+ fract -= whole;
+ psrc += whole;
+ srcCount += whole;
+ }
+ srcSamples = srcCount;
+ return i;
+}
+
+
+/// Transpose stereo audio. Returns number of produced output samples, and
+/// updates "srcSamples" to amount of consumed source samples
+int InterpolateCubic::transposeStereo(SAMPLETYPE *pdest,
+ const SAMPLETYPE *psrc,
+ int &srcSamples)
+{
+ int i;
+ int srcSampleEnd = srcSamples - 4;
+ int srcCount = 0;
+
+ i = 0;
+ while (srcCount < srcSampleEnd)
+ {
+ const float x3 = 1.0f;
+ const float x2 = (float)fract; // x
+ const float x1 = x2*x2; // x^2
+ const float x0 = x1*x2; // x^3
+ float y0, y1, y2, y3;
+ float out0, out1;
+
+ assert(fract < 1.0);
+
+ y0 = _coeffs[0] * x0 + _coeffs[1] * x1 + _coeffs[2] * x2 + _coeffs[3] * x3;
+ y1 = _coeffs[4] * x0 + _coeffs[5] * x1 + _coeffs[6] * x2 + _coeffs[7] * x3;
+ y2 = _coeffs[8] * x0 + _coeffs[9] * x1 + _coeffs[10] * x2 + _coeffs[11] * x3;
+ y3 = _coeffs[12] * x0 + _coeffs[13] * x1 + _coeffs[14] * x2 + _coeffs[15] * x3;
+
+ out0 = y0 * psrc[0] + y1 * psrc[2] + y2 * psrc[4] + y3 * psrc[6];
+ out1 = y0 * psrc[1] + y1 * psrc[3] + y2 * psrc[5] + y3 * psrc[7];
+
+ pdest[2*i] = (SAMPLETYPE)out0;
+ pdest[2*i+1] = (SAMPLETYPE)out1;
+ i ++;
+
+ // update position fraction
+ fract += rate;
+ // update whole positions
+ int whole = (int)fract;
+ fract -= whole;
+ psrc += 2*whole;
+ srcCount += whole;
+ }
+ srcSamples = srcCount;
+ return i;
+}
+
+
+/// Transpose multi-channel audio. Returns number of produced output samples, and
+/// updates "srcSamples" to amount of consumed source samples
+int InterpolateCubic::transposeMulti(SAMPLETYPE *pdest,
+ const SAMPLETYPE *psrc,
+ int &srcSamples)
+{
+ int i;
+ int srcSampleEnd = srcSamples - 4;
+ int srcCount = 0;
+
+ i = 0;
+ while (srcCount < srcSampleEnd)
+ {
+ const float x3 = 1.0f;
+ const float x2 = (float)fract; // x
+ const float x1 = x2*x2; // x^2
+ const float x0 = x1*x2; // x^3
+ float y0, y1, y2, y3;
+
+ assert(fract < 1.0);
+
+ y0 = _coeffs[0] * x0 + _coeffs[1] * x1 + _coeffs[2] * x2 + _coeffs[3] * x3;
+ y1 = _coeffs[4] * x0 + _coeffs[5] * x1 + _coeffs[6] * x2 + _coeffs[7] * x3;
+ y2 = _coeffs[8] * x0 + _coeffs[9] * x1 + _coeffs[10] * x2 + _coeffs[11] * x3;
+ y3 = _coeffs[12] * x0 + _coeffs[13] * x1 + _coeffs[14] * x2 + _coeffs[15] * x3;
+
+ for (int c = 0; c < numChannels; c ++)
+ {
+ float out;
+ out = y0 * psrc[c] + y1 * psrc[c + numChannels] + y2 * psrc[c + 2 * numChannels] + y3 * psrc[c + 3 * numChannels];
+ pdest[0] = (SAMPLETYPE)out;
+ pdest ++;
+ }
+ i ++;
+
+ // update position fraction
+ fract += rate;
+ // update whole positions
+ int whole = (int)fract;
+ fract -= whole;
+ psrc += numChannels*whole;
+ srcCount += whole;
+ }
+ srcSamples = srcCount;
+ return i;
+}