- While recording, collect startcodes and save them into ".sc"-files

[enigma2.git] / lib / dvb / tstools.cpp

diff --git a/lib/dvb/tstools.cpp b/lib/dvb/tstools.cpp
index bd7ebce2843be12e4bef4d6a1f12262b47555215..7ac86f08acff7fa86694fcf63554440eb29baca5 100644 (file)
--- a/lib/dvb/tstools.cpp
+++ b/lib/dvb/tstools.cpp
@@ -32,7 +32,10 @@ int eDVBTSTools::openFile(const char *filename, int nostreaminfo)
        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;
@@ -562,3 +565,68 @@ int eDVBTSTools::findPMT(int &pmt_pid, int &service_id)
        
        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;
+}