only sample each 40MB at max, use fallback bitrate if no other bitrate available
authorFelix Domke <tmbinc@elitedvb.net>
Sun, 5 Mar 2006 21:49:32 +0000 (21:49 +0000)
committerFelix Domke <tmbinc@elitedvb.net>
Sun, 5 Mar 2006 21:49:32 +0000 (21:49 +0000)
lib/dvb/tstools.cpp

index 73ceb7e..34edbc9 100644 (file)
@@ -185,36 +185,39 @@ int eDVBTSTools::getOffset(off_t &offset, pts_t &pts)
                if (!m_samples_taken)
                        takeSamples();
                
                if (!m_samples_taken)
                        takeSamples();
                
-               if (m_samples.empty())
-                       return -1;
-               
+               if (!m_samples.empty())
+               {
 //             eDebug("ok, samples ok");
 //             eDebug("ok, samples ok");
-                       /* search entry before and after */
-               std::map<pts_t, off_t>::const_iterator l = m_samples.lower_bound(pts);
-               std::map<pts_t, off_t>::const_iterator u = l;
+                               /* search entry before and after */
+                       std::map<pts_t, off_t>::const_iterator l = m_samples.lower_bound(pts);
+                       std::map<pts_t, off_t>::const_iterator u = l;
 
 
-               if (l != m_samples.begin())
-                       --l;
+                       if (l != m_samples.begin())
+                               --l;
                
                
-               int birate;
-               if ((u == m_samples.end()) || (l == m_samples.end()))
-                       return -1;
-
-               pts_t pts_diff = u->first - l->first;
-               off_t offset_diff = u->second - l->second;
+                       if ((u != m_samples.end()) && (l != m_samples.end()))
+                       {
+                               pts_t pts_diff = u->first - l->first;
+                               off_t offset_diff = u->second - l->second;
 //             eDebug("using: %llx:%llx -> %llx:%llx", l->first, u->first, l->second, u->second);
        
 //             eDebug("using: %llx:%llx -> %llx:%llx", l->first, u->first, l->second, u->second);
        
-               if (!pts_diff)
-                       return -1;
-
-               int bitrate = calcBitrate(); /* in bits/s */
-               bitrate = offset_diff * 90000 * 8 / pts_diff;
-
-               if (bitrate <= 0)
-                       return -1;
+                               if (pts_diff)
+                               {
+                                       int bitrate = offset_diff * 90000 * 8 / pts_diff;
+                                       if (bitrate > 0)
+                                       {
+                                               offset = l->second;
+                                               offset += ((pts - l->first) * (pts_t)bitrate) / 8ULL / 90000ULL;
+                                               offset -= offset % 188;
+                                               return 0;
+                                       }
+                               }
+                       }
+               }
                
                
-               offset = l->second;
-               offset += ((pts - l->first) * (pts_t)bitrate) / 8ULL / 90000ULL;
+               eDebug("falling back");
+               int bitrate = calcBitrate();
+               offset = pts * (pts_t)bitrate / 8ULL / 90000ULL;
                offset -= offset % 188;
 
                return 0;
                offset -= offset % 188;
 
                return 0;
@@ -322,8 +325,8 @@ void eDVBTSTools::takeSamples()
        
        int nr_samples = 30;
        off_t bytes_per_sample = (m_offset_end - m_offset_begin) / (long long)nr_samples;
        
        int nr_samples = 30;
        off_t bytes_per_sample = (m_offset_end - m_offset_begin) / (long long)nr_samples;
-       if (bytes_per_sample < 1*1024*1024)
-               bytes_per_sample = 1*1024*1024;
+       if (bytes_per_sample < 40*1024*1024)
+               bytes_per_sample = 40*1024*1024;
        
        bytes_per_sample -= bytes_per_sample % 188;
        
        
        bytes_per_sample -= bytes_per_sample % 188;