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/* aKode Cross-fader
Copyright (C) 2004 Allan Sandfeld Jensen <kde@carewolf.com>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "audioframe.h"
#include "arithmetic.h"
#include "crossfader.h"
namespace aKode {
CrossFader::CrossFader(unsigned int time) : time(time),pos(0) {}
// T is the input/output type, S is the fast arithmetics type, Div is a division method
template<typename T, typename S, template<typename S> class Arithm>
static bool _doFrame(AudioFrame* in, int& pos, AudioFrame* frame)
{
T** indata1 = (T**)in->data;
T** indata2 = (T**)frame->data;
//T** outdata = (T**)in->data;
long length;
long max = frame->length;
if (pos >= max) return false;
if (in->channels != frame->channels) return false;
if (in->sample_width != frame->sample_width) return false;
if (in->length > max-pos)
length = in->length = max-pos;
else
length = in->length;
S orgw; // weight of original
S neww; // weight of new
for(int j=0; j<length && pos<max; j++,pos++) {
neww = pos;
orgw = max-pos;
for(int i=0; i<in->channels; i++) {
S signal = 0;
S remainder = 0;
signal += Arithm<S>::div(indata1[i][j],max)*neww;
remainder += Arithm<S>::rem(indata1[i][j],max)*neww;
signal += Arithm<S>::div(indata2[i][pos],max)*orgw;
remainder += Arithm<S>::rem(indata2[i][pos],max)*orgw;
indata1[i][j] = (T)(signal+Arithm<S>::div(remainder,max));
}
}
return true;
}
// T is the input/output type, S is the fast arithmetics type, Arithm defines devisions
template<typename T, typename S, template<typename S> class Arithm>
static bool _readFrame(AudioFrame* in, int& pos, AudioFrame* frame)
{
T** indata = (T**)frame->data;
T** outdata = (T**)in->data;
S length;
S max = frame->length;
if (max-pos <= 1024)
length = max-pos;
else
length = 1024;
if (pos >= max) return false;
in->reserveSpace(frame, (long)length);
S weight;
for(int j=0; j<length && pos<max; j++,pos++) {
weight = (max-pos);
for(int i=0; i<in->channels; i++) {
S signal = Arithm<S>::div(indata[i][pos],max)*weight;
S remainder = Arithm<S>::rem(indata[i][pos],max)*weight;
outdata[i][j] = (T)(signal+Arithm<S>::div(remainder,max));
}
}
return true;
}
template<typename T>
static void _writeFrame(AudioFrame* in, AudioFrame* source)
{
T** indata = (T**)in->data;
T** outdata = (T**)source->data;
int tpos = source->length;
for (int i=0; i<in->channels; i++) {
tpos = source->length;
for(int j = 0; j<in->length && tpos < source->max; j++,tpos++)
{
outdata[i][tpos] = indata[i][j];
}
}
source->length = tpos;
}
// This codes abuses the internal working of AudioFrame, and will need an
// update if AudioFrame is changed.
bool CrossFader::writeFrame(AudioFrame* in)
{
if (source.max==0) {
long length = (in->sample_rate*time)/1000;
source.reserveSpace(in, length);
source.length = 0;
}
if (source.length >= source.max) return false;
if (in->sample_width < -32) {
_writeFrame<double>(in, &source);
} else
if (in->sample_width < 0) {
_writeFrame<float>(in, &source);
} else
if (in->sample_width <= 8) {
_writeFrame<int8_t>(in, &source);
} else
if (in->sample_width <= 16) {
_writeFrame<int16_t>(in, &source);
} else
_writeFrame<int32_t>(in, &source);
return true;
}
bool CrossFader::doFrame(AudioFrame* in)
{
if (in->sample_width < -32) {
return _doFrame<double, double, Arithm_FP>(in, pos, &source);
} else
if (in->sample_width < 0) {
return _doFrame<float, float, Arithm_FP>(in, pos, &source);
} else
if (in->sample_width <= 8) {
return _doFrame<int8_t, int32_t, Arithm_Int>(in, pos, &source);
} else
if (in->sample_width <= 16) {
return _doFrame<int16_t, int32_t, Arithm_Int>(in, pos, &source);
} else
if (in->sample_width <= 24) {
return _doFrame<int32_t, int32_t, Arithm_Int>(in, pos, &source);
} else
return _doFrame<int32_t, int64_t, Arithm_Int>(in, pos, &source);
}
bool CrossFader::readFrame(AudioFrame* in)
{
if (in->sample_width < -32) {
return _readFrame<double, double, Arithm_FP>(in, pos, &source);
} else
if (in->sample_width < 0) {
return _readFrame<float, float, Arithm_FP>(in, pos, &source);
} else
if (in->sample_width <= 8) {
return _readFrame<int8_t, int32_t, Arithm_Int>(in, pos, &source);
} else
if (in->sample_width <= 16) {
return _readFrame<int16_t, int32_t, Arithm_Int>(in, pos, &source);
} else
if (in->sample_width <= 24) {
return _readFrame<int32_t, int32_t, Arithm_Int>(in, pos, &source);
} else
return _readFrame<int32_t, int64_t, Arithm_Int>(in, pos, &source);
}
void CrossFader::setLength(unsigned int new_time) {
time = new_time;
}
bool CrossFader::full() {
return source.max <= source.length;
}
bool CrossFader::done() {
return source.max > 0 && pos >= source.length;
}
} // namespace
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