X-Git-Url: https://git.cweiske.de/enigma2.git/blobdiff_plain/65280b51bffa35ad499ee50d1a474344d9d90dd0..9c3098c8667241d18d2551a9a37ce7fbce396b71:/lib/dvb/tstools.cpp?ds=sidebyside

diff --git a/lib/dvb/tstools.cpp b/lib/dvb/tstools.cpp
index 1b7c5d92..87791c93 100644
--- a/lib/dvb/tstools.cpp
+++ b/lib/dvb/tstools.cpp
@@ -7,12 +7,18 @@
 
 eDVBTSTools::eDVBTSTools()
 {
-	m_fd = -1;
 	m_pid = -1;
 	m_maxrange = 256*1024;
 	
 	m_begin_valid = 0;
 	m_end_valid = 0;
+	
+	m_use_streaminfo = 0;
+	m_samples_taken = 0;
+	
+	m_last_filelength = 0;
+	
+	m_futile = 0;
 }
 
 eDVBTSTools::~eDVBTSTools()
@@ -23,16 +29,27 @@ eDVBTSTools::~eDVBTSTools()
 int eDVBTSTools::openFile(const char *filename)
 {
 	closeFile();
-	m_fd = ::open(filename, O_RDONLY);
-	if (m_fd < 0)
+	
+	m_streaminfo.load((std::string(filename) + ".ap").c_str());
+	
+	if (!m_streaminfo.empty())
+		m_use_streaminfo = 1;
+	else
+	{
+//		eDebug("no recorded stream information available");
+		m_use_streaminfo = 0;
+	}
+	
+	m_samples_taken = 0;
+
+	if (m_file.open(filename, 1) < 0)
 		return -1;
 	return 0;
 }
 
 void eDVBTSTools::closeFile()
 {
-	if (m_fd >= 0)
-		::close(m_fd);
+	m_file.close();
 }
 
 void eDVBTSTools::setSyncPID(int pid)
@@ -46,15 +63,17 @@ void eDVBTSTools::setSearchRange(int maxrange)
 }
 
 	/* getPTS extracts a pts value from any PID at a given offset. */
-int eDVBTSTools::getPTS(off_t &offset, pts_t &pts)
+int eDVBTSTools::getPTS(off_t &offset, pts_t &pts, int fixed)
 {
-	if (m_fd < 0)
+	if (m_use_streaminfo)
+		return m_streaminfo.getPTS(offset, pts);
+	
+	if (!m_file.valid())
 		return -1;
 
 	offset -= offset % 188;
 	
-		// TODO: multiple files!	
-	if (lseek(m_fd, offset, SEEK_SET) < 0)
+	if (m_file.lseek(offset, SEEK_SET) < 0)
 		return -1;
 
 	int left = m_maxrange;
@@ -62,8 +81,11 @@ int eDVBTSTools::getPTS(off_t &offset, pts_t &pts)
 	while (left >= 188)
 	{
 		unsigned char block[188];
-		if (read(m_fd, block, 188) != 188)
+		if (m_file.read(block, 188) != 188)
+		{
+			eDebug("read error");
 			break;
+		}
 		left -= 188;
 		offset += 188;
 		
@@ -76,7 +98,7 @@ int eDVBTSTools::getPTS(off_t &offset, pts_t &pts)
 					break;
 				++i;
 			}
-			offset = lseek(m_fd, i - 188, SEEK_CUR);
+			offset = m_file.lseek(i - 188, SEEK_CUR);
 			continue;
 		}
 		
@@ -112,6 +134,12 @@ int eDVBTSTools::getPTS(off_t &offset, pts_t &pts)
 			pts |= ((unsigned long long)(pes[12]&0xFF)) << 7;
 			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;
 		}
 	}
@@ -119,47 +147,158 @@ int eDVBTSTools::getPTS(off_t &offset, pts_t &pts)
 	return -1;
 }
 
+int eDVBTSTools::fixupPTS(const off_t &offset, pts_t &now)
+{
+	if (m_use_streaminfo)
+	{
+		return m_streaminfo.fixupPTS(offset, now);
+	} else
+	{
+			/* for the simple case, we assume one epoch, with up to one wrap around in the middle. */
+		calcBegin();
+		if (!m_begin_valid)
+		{	
+			eDebug("begin not valid, can't fixup");
+			return -1;
+		}
+		
+		pts_t pos = m_pts_begin;
+		if ((now < pos) && ((pos - now) < 90000 * 10))
+		{	
+			pos = 0;
+			return 0;
+		}
+		
+		if (now < pos) /* wrap around */
+			now = now + 0x200000000LL - pos;
+		else
+			now -= pos;
+		return 0;
+	}
+}
+
+int eDVBTSTools::getOffset(off_t &offset, pts_t &pts)
+{
+	if (m_use_streaminfo)
+	{
+		offset = m_streaminfo.getAccessPoint(pts);
+		return 0;
+	} else
+	{
+//		eDebug("get offset");
+		if (!m_samples_taken)
+			takeSamples();
+		
+		if (!m_samples.empty())
+		{
+//		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;
+		
+			if ((u != m_samples.end()) && (l != m_samples.end()))
+			{
+				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)
+				{
+					int bitrate = offset_diff * 90000 * 8 / pts_diff;
+					if (bitrate > 0)
+					{
+						offset = l->second;
+						offset += ((pts - l->first) * (pts_t)bitrate) / 8ULL / 90000ULL;
+						offset -= offset % 188;
+						return 0;
+					}
+				}
+			}
+		}
+		
+		eDebug("falling back");
+		int bitrate = calcBitrate();
+		offset = pts * (pts_t)bitrate / 8ULL / 90000ULL;
+		offset -= offset % 188;
+
+		return 0;
+	}
+}
+
+int eDVBTSTools::getNextAccessPoint(pts_t &ts, const pts_t &start, int direction)
+{
+	if (m_use_streaminfo)
+		return m_streaminfo.getNextAccessPoint(ts, start, direction);
+	else
+	{
+		eDebug("can't get next access point without streaminfo");
+		return -1;
+	}
+}
+
 void eDVBTSTools::calcBegin()
 {
-	if (m_fd < 0)	
+	if (!m_file.valid())
 		return;
 
-	if (!m_begin_valid)
+	if (!(m_begin_valid || m_futile))
 	{
 		m_offset_begin = 0;
 		if (!getPTS(m_offset_begin, m_pts_begin))
 			m_begin_valid = 1;
+		else
+			m_futile = 1;
 	}
 }
 
 void eDVBTSTools::calcEnd()
 {
-	if (m_fd < 0)	
+	if (!m_file.valid())
 		return;
 	
-	off_t end = lseek(m_fd, 0, SEEK_END);
+	off_t end = m_file.lseek(0, SEEK_END);
 	
-	if (abs(end - m_offset_end) > 1*1024*1024)
+	if (abs(end - m_last_filelength) > 1*1024*1024)
 	{
-		m_offset_end = end;
+		m_last_filelength = end;
 		m_end_valid = 0;
-		eDebug("file size changed, recalc length");
+		
+		m_futile = 0;
+//		eDebug("file size changed, recalc length");
 	}
 	
 	int maxiter = 10;
 	
-	while (!m_end_valid)
+	m_offset_end = m_last_filelength;
+	
+	while (!(m_end_valid || m_futile))
 	{
 		if (!--maxiter)
+		{
+			m_futile = 1;
 			return;
-		
+		}
+
 		m_offset_end -= m_maxrange;
 		if (m_offset_end < 0)
 			m_offset_end = 0;
+
+			/* restore offset if getpts fails */
+		off_t off = m_offset_end;
+
 		if (!getPTS(m_offset_end, m_pts_end))
 			m_end_valid = 1;
+		else
+			m_offset_end = off;
+
 		if (!m_offset_end)
-			return;
+		{
+			m_futile = 1;
+			break;
+		}
 	}
 }
 
@@ -169,6 +308,9 @@ int eDVBTSTools::calcLen(pts_t &len)
 	if (!(m_begin_valid && m_end_valid))
 		return -1;
 	len = m_pts_end - m_pts_begin;
+		/* wrap around? */
+	if (len < 0)
+		len += 0x200000000LL;
 	return 0;
 }
 
@@ -179,6 +321,10 @@ int eDVBTSTools::calcBitrate()
 		return -1;
 
 	pts_t len_in_pts = m_pts_end - m_pts_begin;
+
+		/* wrap around? */
+	if (len_in_pts < 0)
+		len_in_pts += 0x200000000LL;
 	off_t len_in_bytes = m_offset_end - m_offset_begin;
 	
 	if (!len_in_pts)
@@ -190,3 +336,104 @@ int eDVBTSTools::calcBitrate()
 	
 	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 < 40*1024*1024)
+		bytes_per_sample = 40*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 eDVBTSTools::findPMT(int &pmt_pid, int &service_id)
+{
+		/* FIXME: this will be factored out soon! */
+	if (!m_file.valid())
+	{
+		eDebug(" file not valid");
+		return -1;
+	}
+
+	if (m_file.lseek(0, SEEK_SET) < 0)
+	{
+		eDebug("seek failed");
+		return -1;
+	}
+
+	int left = 5*1024*1024;
+	
+	while (left >= 188)
+	{
+		unsigned char block[188];
+		if (m_file.read(block, 188) != 188)
+		{
+			eDebug("read error");
+			break;
+		}
+		left -= 188;
+		
+		if (block[0] != 0x47)
+		{
+			int i = 0;
+			while (i < 188)
+			{
+				if (block[i] == 0x47)
+					break;
+				++i;
+			}
+			m_file.lseek(i - 188, SEEK_CUR);
+			continue;
+		}
+		
+		int pid = ((block[1] << 8) | block[2]) & 0x1FFF;
+		
+		int pusi = !!(block[1] & 0x40);
+		
+		if (!pusi)
+			continue;
+		
+			/* ok, now we have a PES header or section header*/
+		unsigned char *sec;
+		
+			/* check for adaption field */
+		if (block[3] & 0x20)
+			sec = block + block[4] + 4 + 1;
+		else
+			sec = block + 4;
+		
+		if (sec[0])	/* table pointer, assumed to be 0 */
+			continue;
+
+		if (sec[1] == 0x02) /* program map section */
+		{
+			pmt_pid = pid;
+			service_id = (sec[4] << 8) | sec[5];
+			return 0;
+		}
+	}
+	
+	return -1;
+}