1 #include "meterhistory.h"
5 MeterHistory::MeterHistory()
13 MeterHistory::~MeterHistory()
18 void MeterHistory::init(int chs, int sz)
21 delete [] samples; samples = 0;
24 if( !samples && sz > 0 ) {
25 samples = new int64_t[size = sz];
26 for( int i=0; i<size; ++i ) samples[i] = -1;
28 if( channels != chs ) {
29 for( int i=0; i<channels; ++i ) delete [] values[i];
30 delete [] values; values = 0;
31 delete [] current_peak; current_peak = 0;
34 if( !values && chs > 0 ) {
35 current_peak = new int[channels = chs];
36 for( int i=0; i<channels; ++i ) current_peak[i] = 0;
37 values = new double*[channels];
38 for( int i=0; i<channels; ++i ) values[i] = 0;
42 void MeterHistory::reset_channel(int ch)
44 if( !ch ) for( int i=0; i<size; ++i ) samples[i] = -1;
46 double *peaks = values[ch];
47 if( !peaks ) values[ch] = peaks = new double[size];
48 for( int i=0; i<size; ++i ) peaks[i] = 0;
51 void MeterHistory::set_peak(int ch, double peak, int64_t pos)
53 int peak_idx = current_peak[ch];
54 samples[peak_idx] = pos;
55 values[ch][peak_idx++] = peak;
56 if( peak_idx >= size ) peak_idx = 0;
57 current_peak[ch] = peak_idx;
60 double MeterHistory::get_peak(int ch, int idx)
62 return idx>=0 ? values[ch][idx] : 0;
65 int MeterHistory::get_nearest(int64_t pos, int64_t tolerance)
69 int64_t best = tolerance;
70 for( int i=0; i<size; ++i ) {
71 int64_t diff = labs(samples[i] - pos);
72 if( diff >= tolerance || diff >= best ) continue;
73 best = diff; result = i;