cinelerra-5.1/cinelerra/meterhistory.C

   1 #include "meterhistory.h"
   2
   3 #include <stdlib.h>
   4 #include <math.h>
   5
   6 MeterHistory::MeterHistory()
   7 {
   8         size = 0;
   9         channels = 0;
  10         current_peak = 0;
  11         samples = 0;
  12         values = 0;
  13 }
  14 MeterHistory::~MeterHistory()
  15 {
  16         init(0, 0);
  17 }
  18
  19 void MeterHistory::init(int chs, int sz)
  20 {
  21         if( size != sz ) {
  22                 delete [] samples;  samples = 0;
  23                 size = 0;
  24         }
  25         if( !samples && sz > 0 ) {
  26                 samples = new int64_t[size = sz];
  27                 for( int i=0; i<size; ++i ) samples[i] = -1;
  28         }
  29         if( channels != chs ) {
  30                 for( int i=0; i<channels; ++i ) delete [] values[i];
  31                 delete [] values;  values = 0;
  32                 delete [] current_peak;  current_peak = 0;
  33                 channels = 0;
  34         }
  35         if( !values && chs > 0 ) {
  36                 current_peak = new int[channels = chs];
  37                 for( int i=0; i<channels; ++i ) current_peak[i] = 0;
  38                 values = new double*[channels];
  39                 for( int i=0; i<channels; ++i ) values[i] = 0;
  40         }
  41 }
  42
  43 void MeterHistory::reset_channel(int ch)
  44 {
  45         if( !ch ) for( int i=0; i<size; ++i ) samples[i] = -1;
  46         current_peak[ch] = 0;
  47         double *peaks = values[ch];
  48         if( !peaks ) values[ch] = peaks = new double[size];
  49         for( int i=0; i<size; ++i ) peaks[i] = 0;
  50 }
  51
  52 void MeterHistory::set_peak(int ch, double peak, int64_t pos)
  53 {
  54         int peak_idx = current_peak[ch];
  55         samples[peak_idx] = pos;
  56         values[ch][peak_idx++] = peak;
  57         if( peak_idx >= size ) peak_idx = 0;
  58         current_peak[ch] = peak_idx;
  59 }
  60
  61 double MeterHistory::get_peak(int ch, int idx)
  62 {
  63         return idx>=0 ? values[ch][idx] : 0;
  64 }
  65
  66 int MeterHistory::get_nearest(int64_t pos, int64_t tolerance)
  67 {
  68         int result = -1;
  69         if( size > 0 ) {
  70                 int64_t best = tolerance;
  71                 for( int i=0; i<size; ++i ) {
  72                         int64_t diff = labs(samples[i] - pos);
  73                         if( diff >= tolerance || diff >= best ) continue;
  74                         best = diff;  result = i;
  75                 }
  76         }
  77         return result;
  78 }
  79