add teletext parser

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

diff --git a/lib/dvb/tstools.cpp b/lib/dvb/tstools.cpp
index 34edbc9e3289b48be6c5d3218025ba3355cfa453..4ee26265632f464acfa0747cbbf8834cdf830ea6 100644 (file)
--- a/lib/dvb/tstools.cpp
+++ b/lib/dvb/tstools.cpp
@@ -15,6 +15,10 @@ eDVBTSTools::eDVBTSTools()
        
        m_use_streaminfo = 0;
        m_samples_taken = 0;
+       
+       m_last_filelength = 0;
+       
+       m_futile = 0;
 }
 
 eDVBTSTools::~eDVBTSTools()
@@ -38,7 +42,7 @@ int eDVBTSTools::openFile(const char *filename)
        
        m_samples_taken = 0;
 
-       if (m_file.open(filename) < 0)
+       if (m_file.open(filename, 1) < 0)
                return -1;
        return 0;
 }
@@ -64,7 +68,7 @@ int eDVBTSTools::getPTS(off_t &offset, pts_t &pts, int fixed)
        if (m_use_streaminfo)
                return m_streaminfo.getPTS(offset, pts);
        
-       if (!m_file.valid() < 0)
+       if (!m_file.valid())
                return -1;
 
        offset -= offset % 188;
@@ -240,11 +244,13 @@ void eDVBTSTools::calcBegin()
        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;
        }
 }
 
@@ -255,27 +261,44 @@ void eDVBTSTools::calcEnd()
        
        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;
+               
+               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;
+               }
        }
 }
 
@@ -344,3 +367,73 @@ void eDVBTSTools::takeSamples()
        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;
+}