closeFile();
if (!nostreaminfo)
- m_streaminfo.load((std::string(filename) + ".ap").c_str());
+ {
+ eDebug("loading streaminfo for %s", filename);
+ m_streaminfo.load(filename);
+ }
if (!m_streaminfo.empty())
m_use_streaminfo = 1;
return -1;
}
+
+int eDVBTSTools::findIFrame(off_t &_offset, size_t &len, int direction)
+{
+ off_t offset = _offset;
+// eDebug("trying to find iFrame at %llx", offset);
+
+ if (!m_use_streaminfo)
+ {
+ eDebug("can't get next iframe without streaminfo");
+ return -1;
+ }
+
+ /* let's find the iframe before the given offset */
+ unsigned long long data;
+ while (1)
+ {
+ if (m_streaminfo.getStructureEntry(offset, data, (direction == 0) ? 1 : 0))
+ {
+ eDebug("getting structure info for origin offset failed.");
+ return -1;
+ }
+ if (offset == 0x7fffffffffffffffLL) /* eof */
+ {
+ eDebug("reached eof");
+ return -1;
+ }
+ /* data is usually the start code in the lower 8 bit, and the next byte <<8. we extract the picture type from there */
+ /* we know that we aren't recording startcode 0x09 for mpeg2, so this is safe */
+ int is_start = (data & 0xE0FF) == 0x0009; /* H.264 NAL unit access delimiter with I-frame*/
+ is_start |= (data & 0x3800FF) == 0x080000; /* MPEG2 picture start code with I-frame */
+// eDebug("%08llx@%llx -> %d", data, offset, is_start);
+ if (is_start)
+ break;
+
+ if (direction == -1)
+ --offset; /* move to previous entry */
+ else if (direction == +1)
+ direction = 0;
+ }
+ /* let's find the next frame after the given offset */
+ off_t start = offset;
+
+ do {
+ if (m_streaminfo.getStructureEntry(offset, data, 1))
+ {
+ eDebug("get next failed");
+ return -1;
+ }
+ if (offset == 0x7fffffffffffffffLL) /* eof */
+ {
+ eDebug("reached eof (while looking for end of iframe)");
+ return -1;
+ }
+// eDebug("%08llx@%llx", data, offset);
+ } while (((data & 0xFF) != 9) && ((data & 0xFF) != 0x00)); /* next frame */
+
+ /* align to TS pkt start */
+ start = start - (start % 188);
+ offset = offset - (offset % 188);
+
+ len = offset - start;
+ _offset = start;
+// eDebug("result: offset=%llx, len: %ld", offset, (int)len);
+ return 0;
+}