add sync for teletext subtitles and improve text extraction a bit

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

diff --git a/lib/dvb/teletext.cpp b/lib/dvb/teletext.cpp
index 0fa980946bcc6a9053f466697d27a936b72a80d6..54b514e676275a4cc2c6913092339ea7bfdc647d 100644 (file)
--- 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()