From 6e95f24aaf7e2629f193269397ec187ddda8ea3d Mon Sep 17 00:00:00 2001
From: Felix Domke <tmbinc@elitedvb.net>
Date: Tue, 6 Jun 2006 15:41:26 +0000
Subject: add sync for teletext subtitles and improve text extraction a bit

---
 lib/dvb/teletext.cpp       | 80 ++++++++++++++++++++++++++++++++++++++++------
 lib/dvb/teletext.h         |  7 ++--
 lib/service/servicedvb.cpp | 49 ++++++++++++++++++++++++++--
 lib/service/servicedvb.h   |  4 +++
 4 files changed, 124 insertions(+), 16 deletions(-)

(limited to 'lib')

diff --git a/lib/dvb/teletext.cpp b/lib/dvb/teletext.cpp
index 0fa98094..54b514e6 100644
--- a/lib/dvb/teletext.cpp
+++ b/lib/dvb/teletext.cpp
@@ -45,11 +45,32 @@ static inline unsigned long decode_hamming_2418(unsigned char *b)
 		((h24 & 0x7f0000) >> 5);
 }
 
+static int extractPTS(pts_t &pts, unsigned char *pkt)
+{
+	pkt += 7;
+	int flags = *pkt++;
+	
+	pkt++; // header length
+	
+	if (flags & 0x80) /* PTS present? */
+	{
+			/* damn gcc bug */
+		pts  = ((unsigned long long)(((pkt[0] >> 1) & 7))) << 30;
+		pts |=   pkt[1] << 22;
+		pts |=  (pkt[2]>>1) << 15;
+		pts |=   pkt[3] << 7;
+		pts |=  (pkt[5]>>1);
+		
+		return 0;
+	} else
+		return -1;
+}
+
 eDVBTeletextParser::eDVBTeletextParser(iDVBDemux *demux)
 {
 	setStreamID(0xBD); /* as per en 300 472 */
 	
-	setPage(0x150);
+	setPage(-1);
 	
 	if (demux->createPESReader(eApp, m_pes_reader))
 		eDebug("failed to create PES reader!");
@@ -65,6 +86,9 @@ void eDVBTeletextParser::processPESPacket(__u8 *pkt, int len)
 {
 	unsigned char *p = pkt;
 	
+	pts_t pts;
+	int have_pts = extractPTS(pts, pkt);
+	
 	p += 4; len -= 4; /* start code, already be verified by pes parser */
 	p += 2; len -= 2; /* length, better use the argument */	
 	
@@ -135,13 +159,13 @@ void eDVBTeletextParser::processPESPacket(__u8 *pkt, int len)
 				/* page on the same magazine? end current page. */
 			if ((serial_mode || (m_M == m_page_M)) && (m_page_open))
 			{
-				handlePageEnd();
+				handlePageEnd(have_pts, pts);
 				m_page_open = 0;
 			}
 			
 			m_X = decode_hamming_84(data+1) * 0x10 + decode_hamming_84(data);
 			
-			if (m_C & (1<<6))
+			if ((m_C & (1<<6)) && (m_X != 0xFF)) /* scan for pages with subtitle bit set */
 				m_found_subtitle_pages.insert((m_M << 8) | m_X);
 			
 				/* correct page on correct magazine? open page. */
@@ -181,8 +205,21 @@ void eDVBTeletextParser::handlePageStart()
 
 void eDVBTeletextParser::handleLine(unsigned char *data, int len)
 {
+/* // hexdump
+	for (int i=0; i<len; ++i)
+		eDebugNoNewLine("%02x ", decode_odd_parity(data + i));
+	eDebug(""); */
 	if (!m_Y) /* first line is page header, we don't need that. */
+	{
+		m_double_height = -1;
+		return;
+	}
+		
+	if (m_double_height == m_Y)
+	{
+		m_double_height = -1;
 		return;
+	}
 
 	int last_was_white = 1, color = 7; /* start with whitespace. start with color=white. (that's unrelated.) */
 	
@@ -203,7 +240,11 @@ void eDVBTeletextParser::handleLine(unsigned char *data, int len)
 					text = "";
 					color = b;
 				}
-			}
+			} else if (b == 0xd)
+			{
+				m_double_height = m_Y + 1;
+			} else if (b != 0xa && b != 0xb) /* box */
+				eDebug("[ignore %x]", b);
 				/* ignore other attributes */
 		} else
 		{
@@ -220,10 +261,14 @@ void eDVBTeletextParser::handleLine(unsigned char *data, int len)
 	addSubtitleString(color, text);
 }
 
-void eDVBTeletextParser::handlePageEnd()
+void eDVBTeletextParser::handlePageEnd(int have_pts, const pts_t &pts)
 {
 	eDebug("handle page end");
-	addSubtitleString(-1, ""); /* end last line */ 
+	addSubtitleString(-2, ""); /* end last line */ 
+	
+	m_subtitle_page.m_have_pts = have_pts;
+	m_subtitle_page.m_pts = pts;
+	m_subtitle_page.m_timeout = 90000 * 20; /* 20s */
 	sendSubtitlePage();  /* send assembled subtitle page to display */
 }
 
@@ -238,19 +283,34 @@ void eDVBTeletextParser::connectNewPage(const Slot1<void, const eDVBTeletextSubt
 	connection = new eConnection(this, m_new_subtitle_page.connect(slot));
 }
 
-void eDVBTeletextParser::addSubtitleString(int color, const std::string &string)
+void eDVBTeletextParser::addSubtitleString(int color, std::string string)
 {
 //	eDebug("add subtitle string: %s, col %d", string.c_str(), color);
+
+	int force_cell = 0;
+	
+	if (string.substr(0, 2) == "- ")
+	{
+		string = string.substr(2);
+		force_cell = 1;
+	}
+
+//	eDebug("color %d, m_subtitle_color %d", color, m_subtitle_color);
 	gRGB rgbcol((color & 1) ? 255 : 128, (color & 2) ? 255 : 128, (color & 4) ? 255 : 128);
-	if ((color != m_subtitle_color) && !m_subtitle_text.empty())
+	if ((color != m_subtitle_color || force_cell) && !m_subtitle_text.empty() && ((color == -2) || !string.empty()))
 	{
+//		eDebug("add text |%s|: %d != %d || %d", m_subtitle_text.c_str(), color, m_subtitle_color, force_cell);
 		m_subtitle_page.m_elements.push_back(eDVBTeletextSubtitlePageElement(rgbcol, m_subtitle_text));
 		m_subtitle_text = "";
 	} else if (!m_subtitle_text.empty() && m_subtitle_text[m_subtitle_text.size()-1] != ' ')
 		m_subtitle_text += " ";
 	
-	m_subtitle_color = color;
-	m_subtitle_text += string;
+	if (!string.empty())
+	{
+//		eDebug("set %d as new color", color);
+		m_subtitle_color = color;
+		m_subtitle_text += string;
+	}
 }
 
 void eDVBTeletextParser::sendSubtitlePage()
diff --git a/lib/dvb/teletext.h b/lib/dvb/teletext.h
index 2fe9bb70..af9d71f1 100644
--- a/lib/dvb/teletext.h
+++ b/lib/dvb/teletext.h
@@ -19,6 +19,7 @@ struct eDVBTeletextSubtitlePageElement
 struct eDVBTeletextSubtitlePage
 {
 	pts_t m_pts;
+	int m_have_pts;
 	int m_timeout; /* in pts */
 	std::vector<eDVBTeletextSubtitlePageElement> m_elements;
 	
@@ -47,16 +48,16 @@ private:
 	
 	int m_M, m_Y, m_X, m_S1, m_S2, m_S3, m_S4, m_C;
 	
-	int m_page_M, m_page_X, m_page_open;
+	int m_page_M, m_page_X, m_page_open, m_double_height;
 	
 	void handlePageStart();
 	void handleLine(unsigned char *line, int len);
-	void handlePageEnd();
+	void handlePageEnd(int have_pts, const pts_t &pts);
 	
 	std::string m_subtitle_text;
 	int m_subtitle_color;
 	
-	void addSubtitleString(int color, const std::string &string);
+	void addSubtitleString(int color, std::string string);
 	
 	void sendSubtitlePage();
 	
diff --git a/lib/service/servicedvb.cpp b/lib/service/servicedvb.cpp
index f67ea96b..3b111510 100644
--- a/lib/service/servicedvb.cpp
+++ b/lib/service/servicedvb.cpp
@@ -27,7 +27,7 @@
 
 #include <dvbsi++/event_information_section.h>
 
-// #define INTERNAL_TELETEXT
+#define INTERNAL_TELETEXT
 
 #ifndef BYTE_ORDER
 #error no byte order defined!
@@ -646,6 +646,8 @@ eDVBServicePlay::eDVBServicePlay(const eServiceReference &ref, eDVBService *serv
 	m_cutlist_enabled = 1;
 	
 	m_subtitle_widget = 0;
+	
+	CONNECT(m_subtitle_sync_timer.timeout, eDVBServicePlay::checkSubtitleTiming);
 }
 
 eDVBServicePlay::~eDVBServicePlay()
@@ -1896,9 +1898,50 @@ PyObject *eDVBServicePlay::getSubtitleList()
 
 void eDVBServicePlay::newSubtitlePage(const eDVBTeletextSubtitlePage &page)
 {
-	eDebug("new subtitle page received!");
 	if (m_subtitle_widget)
-		m_subtitle_widget->addPage(page);
+	{
+		m_subtitle_pages.push_back(page);
+		
+		checkSubtitleTiming();
+	}
+}
+
+void eDVBServicePlay::checkSubtitleTiming()
+{
+	while (1)
+	{
+		if (m_subtitle_pages.empty())
+			return;
+	
+		eDVBTeletextSubtitlePage p = m_subtitle_pages.front();
+	
+		pts_t pos = 0;
+	
+		if (m_decoder)
+			m_decoder->getPTS(0, pos);
+	
+		int diff = p.m_pts - pos;
+		if (diff < 0)
+		{
+			eDebug("[late (%d ms)]", -diff / 90);
+			diff = 0;
+		}
+		if (diff > 900000)
+		{
+			eDebug("[invalid]");
+			diff = 0;
+		}
+	
+		if (!diff)
+		{
+			m_subtitle_widget->setPage(p);
+			m_subtitle_pages.pop_front();
+		} else
+		{
+			m_subtitle_sync_timer.start(diff / 90, 1);
+			break;
+		}
+	}
 }
 
 DEFINE_REF(eDVBServicePlay)
diff --git a/lib/service/servicedvb.h b/lib/service/servicedvb.h
index 00aba963..5b9cf75c 100644
--- a/lib/service/servicedvb.h
+++ b/lib/service/servicedvb.h
@@ -225,6 +225,10 @@ private:
 	
 	ePtr<eDVBTeletextParser> m_teletext_parser;
 	eSubtitleWidget *m_subtitle_widget;
+	eTimer m_subtitle_sync_timer;
+	std::list<eDVBTeletextSubtitlePage> m_subtitle_pages;
+	
+	void checkSubtitleTiming();
 };
 
 #endif
-- 
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