cinelerra-5.1/cinelerra/meterhistory.C

   1 #include "meterhistory.h"
   2
   3 #include <math.h>
   4
   5 MeterHistory::MeterHistory()
   6 {
   7         size = 0;
   8         channels = 0;
   9         current_peak = 0;
  10         samples = 0;
  11         values = 0;
  12 }
  13 MeterHistory::~MeterHistory()
  14 {
  15         init(0, 0);
  16 }
  17
  18 void MeterHistory::init(int chs, int sz)
  19 {
  20         if( size != sz ) {
  21                 delete [] samples;  samples = 0;
  22                 size = 0;
  23         }
  24         if( !samples && sz > 0 ) {
  25                 samples = new int64_t[size = sz];
  26                 for( int i=0; i<size; ++i ) samples[i] = -1;
  27         }
  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;
  32                 channels = 0;
  33         }
  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;
  39         }
  40 }
  41
  42 void MeterHistory::reset_channel(int ch)
  43 {
  44         if( !ch ) for( int i=0; i<size; ++i ) samples[i] = -1;
  45         current_peak[ch] = 0;
  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;
  49 }
  50
  51 void MeterHistory::set_peak(int ch, double peak, int64_t pos)
  52 {
  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;
  58 }
  59
  60 double MeterHistory::get_peak(int ch, int idx)
  61 {
  62         return idx>=0 ? values[ch][idx] : 0;
  63 }
  64
  65 int MeterHistory::get_nearest(int64_t pos, int64_t tolerance)
  66 {
  67         int result = -1;
  68         if( size > 0 ) {
  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;
  74                 }
  75         }
  76         return result;
  77 }
  78