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#include "nodes_audio_analysis.h"
namespace Rotor{
bool Audio_thumbnailer::init(int _channels,int _bits,int _samples,int _rate) {
//base_audio_processor::init(_channels,_bits,_samples);
channels=_channels;
bits=_bits;
samples=_samples;
samples_per_column=samples/width;
offset=0x1<<(bits-1); //signed audio
scale=1.0f/offset;
out_sample=0; //sample in whole track
sample=0;
samples=0;
accum=0.0;
return true;
}
int Audio_thumbnailer::process_frame(uint8_t *_data,int samples_in_frame){
//begin by processing remaining samples
//samples per column could be larger than a frame! (probably is)
//but all we are doing is averaging
int bytes=(bits>>3);
int stride=channels*bytes;
int in_sample=0;
while (in_sample<samples_in_frame) {
//continue the column
while (sample<samples_per_column&&in_sample<samples_in_frame) {
//accumulate samples for this column until we run out of samples
for (int i=0;i<channels;i++) {
unsigned int this_val=0;
for (int j=0;j<bytes;j++) {
this_val+=_data[(in_sample*stride)+(i*bytes)+j]<<(j*8);
}
//convert from integer data format - i.e s16p - to audio signal in -1..1 range
//presume 16 bits for now...
double val=((double)((int16_t)this_val))*scale;
accum+=val*val;
samples++;
}
in_sample++;
sample++;
out_sample++;
}
if (sample==samples_per_column) { //finished a column
//get root-mean
//why does valgrind complain here about uninitialised vars
double mean=pow(accum/samples,0.5f);
audiodata.push_back(mean);
sample=0;
samples=0;
accum=0.0;
}
}
return out_sample;
}
void Audio_thumbnailer::print_vector(xmlIO XML){
string vdata;
int i=0;
for (auto sample: audiodata){
if (i>0) vdata+=",";
vdata+=toString(sample);
}
XML.addValue("data",vdata);
}
bool Vamp_node::init(int _channels,int _bits,int _samples, int _rate) {
//need these to make sense of data
channels=_channels;
bits=_bits;
samples=_samples;
return analyser.init(soname,id,_channels,_bits,_samples,_rate,outputNo,params);
//attempt to load vamp plugin and prepare to receive frames of data
//should the audio analysis contain a vamphost or should it inherit?
//maybe neater to contain it in terms of headers etc
}
int Vamp_node::process_frame(uint8_t *data,int samples_in_frame) {
analyser.process_frame(data,samples_in_frame);
return 1;
}
void Vamp_node::cleanup() {
analyser.cleanup();
features=analyser.features;
}
string Vamp_node::get_features(){
string data;
for (auto i: features) {
data=data+" ["+toString(i.second.number)+":"+toString(i.first);
if (i.second.values.size()) {
data+=" (";
bool first=true;
for (auto j: i.second.values) {
if (first){
first=false;
}
else data+=",";
data=data+toString(j);
}
data+=") ";
}
data+="]";
}
return data;
}
bool sortsegments(std::pair<int,float> i,std::pair<int,float> j){
return (i.second<j.second);
}
void Intensity_segmenter::cleanup(){
//algorithm idea:
//get average tempo and intensity for each segment and store them
//scale by the range to get a value from 0.0 to 1.0
//add tempo and intensity according to a weighting
//score the results (ie 1st place, 2nd place) to end up with a set of integer numbers
//for (auto a:analysers) a.second.cleanup(); //WHY NOT WORK - its as if the call is const
analysers["segmenter"].cleanup();
analysers["tempo"].cleanup();
analysers["intensity"].cleanup();
cerr<<analysers["segmenter"].features.size()<<" segments"<<endl;
cerr<<analysers["tempo"].features.size()<<" tempo features"<<endl;
cerr<<analysers["intensity"].features.size()<<" intensity features"<<endl;
int i=0;
float min_tempo=9999999.0f;
float min_intensity=9999999.0f;
float max_tempo=0.0f;
float max_intensity=0.0f;
vector<float> tempos;
vector<float> intensities;
vector<float> times;
auto g=++analysers["segmenter"].features.begin();
for (auto f=analysers["segmenter"].features.begin();g!=analysers["segmenter"].features.end();f++,g++,i++){
cerr<<"segment "<<i<<": "<<f->first<<" to "<<g->first<<endl;
times.push_back(f->first);
//integrate tempo and intensity algorithmically
float tempo=0;
if (analysers["tempo"].features.size()) {
float pt=f->first;
float pv=analysers["tempo"].get_value(f->first);
for (auto u=analysers["tempo"].features.upper_bound(f->first);u!=analysers["tempo"].features.upper_bound(g->first);u++){
tempo +=(u->first-pt)*(u->second.values[0]+pv)*0.5f; //area of the slice
pt=u->first;
pv=u->second.values[0];
}
tempo +=(g->first-pt)*(analysers["tempo"].get_value(g->first)+pv)*0.5f; //area of the last slice
tempo /=g->first-f->first; //average value;
}
if (tempo>max_tempo) max_tempo=tempo;
if (tempo<min_tempo) min_tempo=tempo;
tempos.push_back(tempo);
cerr<<"segment "<<i<<" average tempo: "<<tempo<<endl;
float intensity=0;
if (analysers["intensity"].features.size()) {
float pt=f->first;
float pv=analysers["intensity"].get_value(f->first);
for (auto u=analysers["intensity"].features.upper_bound(f->first);u!=analysers["intensity"].features.upper_bound(g->first);u++){
intensity +=(u->first-pt)*(u->second.values[0]+pv)*0.5f; //area of the slice
pt=u->first;
pv=u->second.values[0];
}
intensity +=(g->first-pt)*(analysers["intensity"].get_value(g->first)+pv)*0.5f; //area of the last slice
intensity /=g->first-f->first; //average value;
}
if (intensity>max_intensity) max_intensity=intensity;
if (intensity<min_intensity) min_intensity=intensity;
intensities.push_back(intensity);
cerr<<"segment "<<i<<" average intensity: "<<intensity<<endl;
}
//make relative scale 0.0-1.0 and save weighted totals
vector< pair<int,float>> totals;
for (i=0;i<tempos.size();i++){
tempos[i]=(tempos[i]-min_tempo)/(max_tempo-min_tempo);
intensities[i]=(intensities[i]-min_intensity)/(max_intensity-min_intensity);
totals.push_back(make_pair(i,(tempos[i]*parameters["tempo_weight"]->value)+(intensities[i]*parameters["intensity_weight"]->value)));
}
//sort and convert to features
std::sort(totals.begin(),totals.end(),sortsegments);
for (int i=0;i<totals.size();i++){
vampHost::feature f;
f.values.push_back((float)i);
features[times[totals[i].first]]=f;
}
return true;
}
}
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