add PVR packet parser to assist finding cutpoints

[enigma2.git] / lib / dvb / pvrparse.h

diff --git a/lib/dvb/pvrparse.h b/lib/dvb/pvrparse.h
new file mode 100644 (file)
index 0000000..5ca6263
--- /dev/null
+++ b/lib/dvb/pvrparse.h
@@ -0,0 +1,61 @@
+#ifndef __include_lib_dvb_pvrparse_h
+#define __include_lib_dvb_pvrparse_h
+
+#include <lib/dvb/idvb.h>
+#include <map>
+#include <set>
+
+       /* This module parses TS data and collects valuable information  */
+       /* about it, like PTS<->offset correlations and sequence starts. */
+
+       /* At first, we define the collector class: */
+class eMPEGStreamInformation
+{
+public:
+               /* we order by off_t here, since the timestamp may */
+               /* wrap around. */
+               /* we only record sequence start's pts values here. */
+       std::map<off_t, pts_t> m_access_points;
+               /* timestampDelta is in fact the difference between */
+               /* the PTS in the stream and a real PTS from 0..max */
+       std::map<off_t, pts_t> m_timestamp_deltas;
+       
+       int save(const char *filename);
+       int load(const char *filename);
+       
+               /* recalculates timestampDeltas */
+       void fixupDiscontinuties();
+       
+               /* get delta at specific offset */
+       pts_t getDelta(off_t offset);
+       
+               /* fixup timestamp near offset */
+       pts_t fixuppts_t(off_t offset, pts_t ts);
+       
+               /* inter/extrapolate timestamp from offset */
+       pts_t getInterpolated(off_t offset);
+       
+       off_t getAccessPoint(pts_t ts);
+       
+       bool empty();
+};
+
+       /* Now we define the parser's state: */
+class eMPEGStreamParserTS
+{
+public:
+       eMPEGStreamParserTS(eMPEGStreamInformation &streaminfo);
+       void parseData(off_t offset, const void *data, unsigned int len);
+       void setPid(int pid);
+private:
+       eMPEGStreamInformation &m_streaminfo;
+       unsigned char m_pkt[188];
+       int m_pktptr;
+       int processPacket(const unsigned char *pkt, off_t offset);
+       inline int wantPacket(const unsigned char *hdr) const;
+       int m_pid;
+       int m_need_next_packet;
+       int m_skip;
+};
+
+#endif