m_end_valid = 0;
m_use_streaminfo = 0;
+ m_samples_taken = 0;
}
eDVBTSTools::~eDVBTSTools()
eDebug("no recorded stream information available");
m_use_streaminfo = 0;
}
+
+ m_samples_taken = 0;
if (m_file.open(filename) < 0)
return -1;
pts |= ((unsigned long long)(pes[13]&0xFE)) >> 1;
offset -= 188;
+// eDebug("found pts %08llx at %08llx", pts, offset);
+
/* convert to zero-based */
if (fixed)
fixupPTS(offset, pts);
return 0;
} else
{
+// eDebug("get offset");
+ if (!m_samples_taken)
+ takeSamples();
+
+ if (m_samples.empty())
+ return -1;
+
+// 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;
+
+ 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;
+// 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;
- offset = (pts * (pts_t)bitrate) / 8ULL / 90000ULL;
+ offset = l->second;
+ offset += ((pts - l->first) * (pts_t)bitrate) / 8ULL / 90000ULL;
offset -= offset % 188;
return 0;
return -1;
return bitrate;
+}
+
+ /* pts, off */
+void eDVBTSTools::takeSamples()
+{
+ m_samples_taken = 1;
+ m_samples.clear();
+ pts_t dummy;
+ if (calcLen(dummy) == -1)
+ return;
+
+ 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;
+
+ bytes_per_sample -= bytes_per_sample % 188;
+
+ for (off_t offset = m_offset_begin; offset < m_offset_end; offset += bytes_per_sample)
+ {
+ off_t o = offset;
+ pts_t p;
+ if (!eDVBTSTools::getPTS(o, p, 1))
+ {
+// eDebug("sample: %llx, %llx", o, p);
+ m_samples[p] = o;
+ }
+ }
+ m_samples[m_pts_begin] = m_offset_begin;
+ m_samples[m_pts_end] = m_offset_end;
+// eDebug("begin, end: %llx %llx", m_offset_begin, m_offset_end);
}
int calcBitrate(); /* in bits/sec */
+ void takeSamples();
+
private:
int m_pid;
int m_maxrange;
pts_t m_pts_begin, m_pts_end;
off_t m_offset_begin, m_offset_end;
+ /* for simple linear interpolation */
+ std::map<pts_t, off_t> m_samples;
+ int m_samples_taken;
+
eMPEGStreamInformation m_streaminfo;
int m_use_streaminfo;
};