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/* aKode Resampler (Secret Rabbit Code)
Copyright (C) 2004,2006 Allan Sandfeld Jensen <kde@carewolf.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Steet, Fifth Floor, Boston,
MA 02110-1301, USA.
*/
#include "akodelib.h"
#include <samplerate.h>
#include "arithmetic.h"
#include "audioframe.h"
#include "src_resampler.h"
namespace aKode {
SRCResampler* SRCResamplerPlugin::openResampler() {
return new SRCResampler();
}
extern "C" { SRCResamplerPlugin src_resampler; }
SRCResampler::SRCResampler() : speed(1.0), sample_rate(44100) {}
template<typename S>
static void _convert1_FP(AudioFrame *in, float* outdata)
{
long length = in->length;
int channels = in->channels;
S** indata = (S**)in->data;
for(int j=0; j<length; j++) {
for(int i=0; i<channels; i++) {
outdata[i+j*channels] = (float)(indata[i][j]);
}
}
}
template<typename S>
static void _convert1_Int(AudioFrame *in, float* outdata)
{
float scale = 1.0/(float)Arithm_Int<S>::max(in->sample_width);
long length = in->length;
int channels = in->channels;
S** indata = (S**)in->data;
for(int j=0; j<length; j++) {
for(int i=0; i<channels; i++) {
outdata[i+j*channels] = scale*indata[i][j];
}
}
}
// demux channels
template<typename S>
static void _convert2_FP(float *indata, AudioFrame* out)
{
long length = out->length;
int channels = out->channels;
S** outdata = (S**)out->data;
for(int j=0; j<length; j++) {
for(int i=0; i<channels; i++) {
outdata[i][j] = (S)(indata[i+j*channels]);
}
}
}
template<typename S>
static void _convert2_Int(float *indata, AudioFrame* out)
{
float scale = Arithm_Int<S>::max(out->sample_width);
long length = out->length;
int channels = out->channels;
S** outdata = (S**)out->data;
for(int j=0; j<length; j++) {
for(int i=0; i<channels; i++) {
outdata[i][j] = (S)(scale*indata[i+j*channels]);
}
}
}
// A high quality resampling by using libsamplerate
bool SRCResampler::doFrame(AudioFrame* in, AudioFrame* out)
{
// Ouch, I dont like this much mallocing
float *tmp1 = new float[in->channels*in->length];
// convert to float frames
if (in->sample_width == -64) {
_convert1_FP<double>(in, tmp1);
} else
if (in->sample_width == -32) {
_convert1_FP<float>(in, tmp1);
} else
if (in->sample_width <= 8) {
_convert1_Int<int8_t>(in, tmp1);
} else
if (in->sample_width <= 16) {
_convert1_Int<int16_t>(in, tmp1);
} else
_convert1_Int<int32_t>(in, tmp1);
float ratio = (sample_rate/(float)in->sample_rate) / speed;
long outlength = (long)((in->length + ratio) * ratio); // max size
float *tmp2 = new float[in->channels*outlength];
// We should figure out if interleaving first is faster
// than making a call per channel
// for (int i=0; i<in->channels; i++) {
SRC_DATA src_data;
src_data.data_in = tmp1;
src_data.data_out = tmp2;
src_data.input_frames = in->length;
src_data.output_frames = outlength;
src_data.src_ratio = ratio;
src_simple(&src_data, SRC_SINC_MEDIUM_QUALITY, in->channels);
// }
AudioConfiguration config = *in;
config.sample_width = -32;
config.sample_rate = sample_rate;
out->reserveSpace(&config, src_data.output_frames_gen);
out->pos = in->pos;
// convert from float frames
#if 0
if (out->sample_width > 0) {
if (out->sample_width <= 8) {
_convert2_Int<int8_t>(tmp2, out);
} else
if (out->sample_width <= 16) {
_convert2_Int<int16_t>(tmp2, out);
} else
_convert2_Int<int32_t>(tmp2, out);
} else
if (out->sample_width == -64)
_convert2_FP<double>(tmp2, out);
else
#endif
_convert2_FP<float>(tmp2, out);
delete[] tmp1;
delete[] tmp2;
return true;
}
void SRCResampler::setSpeed(float value) {
speed = value;
}
void SRCResampler::setSampleRate(unsigned int rate) {
sample_rate = rate;
}
} // namespace
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