Select start position for replaying a recording by parameter pos=

Based on offset_5.diff from hivdr@vdrportal with the following modifications:
- indenting
- replaced isyslog with Dprintf
- left out HTTP header "Server:" for the moment

CONTRIBUTORS

@@ -217,3 +217,6 @@ macmenot
 
 thomasjfox
   for fixing cSuspendCtl preventing idle shutdown
+
+hivdr
+  for adding the pos= parameter for replaying recordings from a certain position

HISTORY

@@ -1,6 +1,9 @@
 VDR Plugin 'streamdev' Revision History
 ---------------------------------------
  
+- Select start position for replaying a recording by parameter pos=. Supported
+  values are resume, mark.#, time.#, frame.# or a plain # representing a
+  percentage if < 100 or a byte position otherwise (thanks to hivdr)
 - Start cSuspendCtl hidden or it will prevent idle shutdown (thanks to
   thomasjfox)
 - Fixed recordings menu inode numbers: ino_t is a long long on some systems

server/connectionHTTP.c

@@ -199,20 +199,52 @@ bool cConnectionHTTP::ProcessRequest(void)
 		}
 		else if (m_Recording != NULL) {
 			Dprintf("GET recording\n");
-			cStreamdevRecStreamer* recStreamer = new cStreamdevRecStreamer(m_Recording, this);
+			cStreamdevRecStreamer* recStreamer = new cStreamdevRecStreamer(m_Recording, this, m_ReplayPos);
 			m_Streamer = recStreamer;
 			int64_t from, to;
 			uint64_t total = recStreamer->GetLength();
 			if (ParseRange(from, to)) {
+				Dprintf("parsed from-to: %lld - %lld\n", (long long)from, (long long)to);
 				int64_t length = recStreamer->SetRange(from, to);
+				int64_t fromByPos = recStreamer->GetFromByPos();
+				if (fromByPos > 0) {
+					if (from == 0) {
+						from = fromByPos;
+						to = total - 1;
+						Dprintf("from byte: %lld\n", (long long)from);
+						}
+					else if (m_ReplayPos.find("full_") != 0) {
+						from += fromByPos;
+						to += fromByPos;
+					}
+					Dprintf("part of recording: %lld-%lld/%lld\n", (long long)from, (long long)to, (long long)total);
+					length = recStreamer->SetRange(from, to);
+					Dprintf("part of recording: %lld-%lld/%lld, len %lld\n", (long long)from, (long long)to, (long long)total, (long long)length);
+				}
+				if (m_ReplayPos.find("full_") != 0 && fromByPos > 0) {
+					from -= fromByPos;
+					to -= fromByPos;
+					total -= fromByPos;
+				}
+				Dprintf("range response: %lld-%lld/%lld, len %lld\n", (long long)from, (long long)to, (long long)total, (long long)length);
 				if (length < 0L)
 					return HttpResponse(416, true, "video/mpeg", "Accept-Ranges: bytes\r\nContent-Range: bytes */%llu", (unsigned long long) total);
 				else
 					return HttpResponse(206, false, "video/mpeg", "Accept-Ranges: bytes\r\nContent-Range: bytes %lld-%lld/%llu\r\nContent-Length: %lld", (long long) from, (long long) to, (unsigned long long) total, (long long) length);
 			}
-			else
+			else {
+				int64_t fromByPos = recStreamer->GetFromByPos();
+				if (fromByPos > 0) {
+					from = fromByPos;
+					to = total - 1;
+					Dprintf("from byte: %lld\n", (long long)from);
+					int64_t length = recStreamer->SetRange(from, to);
+					Dprintf("part of recording: %lld-%lld/%lld, len %lld\n", (long long)from, (long long)to, (long long)total, (long long)length);
+				}
+				
 				return HttpResponse(200, false, "video/mpeg", "Accept-Ranges: bytes");
 			}
+		}
 		else {
 			return HttpResponse(404, true);
 		}
@@ -240,7 +272,7 @@ bool cConnectionHTTP::ProcessRequest(void)
 		}
 		else if (m_Recording != NULL) {
 			Dprintf("HEAD recording\n");
-			cStreamdevRecStreamer *recStreamer = new cStreamdevRecStreamer(m_Recording, this);
+			cStreamdevRecStreamer *recStreamer = new cStreamdevRecStreamer(m_Recording, this, m_ReplayPos);
 			m_Streamer = recStreamer;
 			int64_t from, to;
 			uint64_t total = recStreamer->GetLength();
@@ -330,6 +362,7 @@ bool cConnectionHTTP::ParseRange(int64_t &From, int64_t &To) const
 	From = To = 0L;
 	tStrStrMap::const_iterator it = Headers().find(RANGE);
 	if (it != Headers().end()) {
+		Dprintf("%s: %s\n", it->first.c_str(), it->second.c_str());
 		size_t b = it->second.find("bytes=");
 		if (b != std::string::npos) {
 			char* e = NULL;
@@ -521,6 +554,14 @@ bool cConnectionHTTP::ProcessURI(const std::string& PathInfo)
 		return true;
 	} else if ((m_Recording = RecordingFromString(filespec.c_str(), fileext.c_str())) != NULL) {
 		Dprintf("Recording %s found\n", m_Recording->Name());
+		tStrStrMap::iterator it = m_Params.begin();
+		while (it != m_Params.end()) {
+			if (it->first == "pos") {
+				m_ReplayPos = it->second;
+				Dprintf("pos: %s\n", m_ReplayPos.c_str());
+				break;
+			}
+		}
 		return true;
 	} else if ((m_Channel = ChannelFromString(filespec.c_str(), &m_Apid[0], &m_Dpid[0])) != NULL) {
 		Dprintf("Channel found. Apid/Dpid is %d/%d\n", m_Apid[0], m_Dpid[0]);

server/connectionHTTP.h

@@ -35,6 +35,7 @@ private:
 	int                               m_Dpid[2];
 	// job: replay
 	cRecording                       *m_Recording;
+	std::string                       m_ReplayPos;
 	// job: listing
 	cMenuList                        *m_MenuList;
 
@@ -69,6 +70,7 @@ public:
 
 	virtual bool Abort(void) const;
 	virtual void Flushed(void);
+	inline std::string GetReplayPos() { return m_ReplayPos; }
 };
 
 inline bool cConnectionHTTP::Abort(void) const

server/recplayer.c

@@ -19,6 +19,10 @@
     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
 
+#include <iostream>
+#include <fstream>
+#include <string>
+
 #include "recplayer.h"
 
 // for TSPLAY patch detection
@@ -210,6 +214,47 @@ cRecording* RecPlayer::getCurrentRecording()
   return recording;
 }
 
+int RecPlayer::frameFromResume()
+{
+  int frame = 0;
+  char fileName[2048];
+  snprintf(fileName, 2047, "%s/resume", recording->FileName());
+  std::ifstream ifs;
+  ifs.open(fileName);
+  if (!ifs.is_open()) return 0;
+  std::string sFrame;
+  getline(ifs, sFrame);
+  ifs.close();
+  sFrame=sFrame.substr(2);
+  frame=atoi(sFrame.c_str());
+  return frame;
+}
+
+int RecPlayer::frameFromMark(int index)
+{
+  char fileName[2048];
+  snprintf(fileName, 2047, "%s/marks", recording->FileName());
+  std::ifstream ifs;
+  ifs.open(fileName);
+  if (!ifs.is_open()) return 0;
+  std::string sTime;
+  for (int i=0; i<=index; i++) {
+	getline(ifs, sTime);
+	if (ifs.eof()) break;
+  }
+  ifs.close();
+  int seconds = 0, minutes = 0, hours = 0;
+  hours = atoi(sTime.substr(0, sTime.find(":")).c_str());
+  minutes = atoi(sTime.substr(sTime.find(":") + 1, 2).c_str());
+  seconds = atoi(sTime.substr(sTime.rfind(":") + 1, 2).c_str());
+  return frameFromSeconds(seconds + minutes * 60 + hours * 3600);
+}
+
+int RecPlayer::frameFromSeconds(int seconds)
+{
+	return 25 * seconds; // 25fps
+}
+
 uint64_t RecPlayer::positionFromFrameNumber(uint32_t frameNumber)
 {
   if (!indexFile) return 0;

server/recplayer.h

@@ -46,6 +46,9 @@ class RecPlayer
     cRecording* getCurrentRecording();
     void scan();
     uint64_t positionFromFrameNumber(uint32_t frameNumber);
+    int frameFromResume();
+    int frameFromMark(int index);
+    int frameFromSeconds(int seconds);
     uint32_t frameNumberFromPosition(uint64_t position);
     bool getNextIFrame(uint32_t frameNumber, uint32_t direction, uint64_t* rfilePosition, uint32_t* rframeNumber, uint32_t* rframeLength);
 

server/recstreamer.c

@@ -12,13 +12,14 @@ using namespace Streamdev;
 
 // --- cStreamdevRecStreamer -------------------------------------------------
 
-cStreamdevRecStreamer::cStreamdevRecStreamer(cRecording *Rec, const cServerConnection *Connection):
+cStreamdevRecStreamer::cStreamdevRecStreamer(cRecording *Rec, const cServerConnection *Connection, std::string pos):
 		cStreamdevStreamer("streamdev-recstreaming", Connection),
 		m_RecPlayer(Rec),
 		m_From(0L)
 {
 	Dprintf("New rec streamer\n");
 	m_To = (int64_t) m_RecPlayer.getLengthBytes() - 1;
+	m_Pos = pos;
 }
 
 cStreamdevRecStreamer::~cStreamdevRecStreamer() 
@@ -52,6 +53,69 @@ int64_t cStreamdevRecStreamer::SetRange(int64_t &From, int64_t &To)
 	return m_To - m_From + 1;
 }
 
+int32_t cStreamdevRecStreamer::getIFrameBeforeFrame(int32_t frame)
+{
+	uint32_t iframe, len;
+	uint64_t pos;
+	m_RecPlayer.getNextIFrame(frame + 1, 0, &pos, &iframe, &len);
+	Dprintf("pos: frame %i -> start at iFrame %i\n", frame, iframe);
+	return iframe;
+}
+
+int64_t cStreamdevRecStreamer::GetFromByPos()
+{
+	if (m_Pos.empty()) return 0;
+	
+	std::string pos = m_Pos;
+	
+	// cut prefix (if any)
+	if (pos.find('_') != std::string::npos) {
+		pos = pos.substr(pos.find('_') + 1);
+	}
+
+	// resume file
+	if (pos == "resume") {
+		int frame = getIFrameBeforeFrame(m_RecPlayer.frameFromResume());
+		Dprintf("pos: frame from resume: %i\n", frame);
+		return m_RecPlayer.positionFromFrameNumber(frame);
+	}
+	
+	// mark
+	if (pos.find("mark.") == 0) {
+		int index = atoi(pos.substr(5).c_str());
+		int frame = getIFrameBeforeFrame(m_RecPlayer.frameFromMark(index));
+		Dprintf("pos: mark %i - frame %i\n", index, frame);
+		return m_RecPlayer.positionFromFrameNumber(frame);
+	}
+
+	// time
+	if (pos.find("time.") == 0) {
+		int seconds = atoi(pos.substr(5).c_str());
+		int frame = getIFrameBeforeFrame(m_RecPlayer.frameFromSeconds(seconds));
+		Dprintf("pos: %i seconds - frame %i\n", seconds, frame);
+		return m_RecPlayer.positionFromFrameNumber(frame);
+	}
+	
+	// frame number
+	if (pos.find("frame.") == 0) {
+		int frame = getIFrameBeforeFrame(atoi(pos.substr(6).c_str()));
+		Dprintf("pos: frame %i\n", frame);
+		return m_RecPlayer.positionFromFrameNumber(frame);
+	}
+
+	// default: byte index or percent
+	// as "%" is the url escape character, interpret <100 as percent
+	// if (pos.find("%") != std::string::npos) {
+	// int percent = atoi(pos.substr(0, pos.find("%")).c_str());
+	int64_t number = atol(pos.c_str());
+	if (number < 100) {
+		Dprintf("pos: %lld percent\n", (long long)number);
+		int64_t offset = m_RecPlayer.getLengthBytes() * number / 100;
+		return offset;
+	}
+	return number;
+}
+
 uchar* cStreamdevRecStreamer::GetFromReceiver(int &Count)
 {
 	if (m_From <= m_To) {

server/recstreamer.h

@@ -14,6 +14,7 @@ private:
 	RecPlayer               m_RecPlayer;
 	int64_t                 m_From;
 	int64_t                 m_To;
+	std::string		m_Pos;
 	uchar                   m_Buffer[RECBUFSIZE];
 
 protected:
@@ -25,7 +26,9 @@ public:
 	inline uint64_t GetLength() { return m_RecPlayer.getLengthBytes(); }
 	int64_t SetRange(int64_t &From, int64_t &To);
 	virtual cString ToText() const;
-	cStreamdevRecStreamer(cRecording *Recording, const cServerConnection *Connection);
+	int64_t GetFromByPos();
+	int32_t getIFrameBeforeFrame(int32_t frame);
+	cStreamdevRecStreamer(cRecording *Recording, const cServerConnection *Connection, std::string pos);
 	virtual ~cStreamdevRecStreamer();
 };