also use PCR (optionally), don't use non-video, non-audio streams, fix improper sampl...
authorFelix Domke <tmbinc@elitedvb.net>
Thu, 15 Mar 2007 02:37:39 +0000 (02:37 +0000)
committerFelix Domke <tmbinc@elitedvb.net>
Thu, 15 Mar 2007 02:37:39 +0000 (02:37 +0000)
lib/dvb/tstools.cpp

index c111541..b47de86 100644 (file)
@@ -81,8 +81,8 @@ int eDVBTSTools::getPTS(off_t &offset, pts_t &pts, int fixed)
        
        while (left >= 188)
        {
        
        while (left >= 188)
        {
-               unsigned char block[188];
-               if (m_file.read(block, 188) != 188)
+               unsigned char packet[188];
+               if (m_file.read(packet, 188) != 188)
                {
                        eDebug("read error");
                        break;
                {
                        eDebug("read error");
                        break;
@@ -90,12 +90,12 @@ int eDVBTSTools::getPTS(off_t &offset, pts_t &pts, int fixed)
                left -= 188;
                offset += 188;
                
                left -= 188;
                offset += 188;
                
-               if (block[0] != 0x47)
+               if (packet[0] != 0x47)
                {
                        int i = 0;
                        while (i < 188)
                        {
                {
                        int i = 0;
                        while (i < 188)
                        {
-                               if (block[i] == 0x47)
+                               if (packet[i] == 0x47)
                                        break;
                                ++i;
                        }
                                        break;
                                ++i;
                        }
@@ -103,10 +103,38 @@ int eDVBTSTools::getPTS(off_t &offset, pts_t &pts, int fixed)
                        continue;
                }
                
                        continue;
                }
                
-               int pid = ((block[1] << 8) | block[2]) & 0x1FFF;
-               int pusi = !!(block[1] & 0x40);
+               int pid = ((packet[1] << 8) | packet[2]) & 0x1FFF;
+               int pusi = !!(packet[1] & 0x40);
                
 //             printf("PID %04x, PUSI %d\n", pid, pusi);
                
 //             printf("PID %04x, PUSI %d\n", pid, pusi);
+
+               unsigned char *payload;
+               
+                       /* check for adaption field */
+               if (packet[3] & 0x20)
+               {
+                       if (packet[4] >= 183)
+                               continue;
+                       if (packet[4])
+                       {
+                               if (packet[5] & 0x10) /* PCR present */
+                               {
+                                       pts  = ((unsigned long long)(packet[ 6]&0xFF)) << 25;
+                                       pts |= ((unsigned long long)(packet[ 7]&0xFF)) << 17;
+                                       pts |= ((unsigned long long)(packet[ 8]&0xFE)) << 9;
+                                       pts |= ((unsigned long long)(packet[ 9]&0xFF)) << 1;
+                                       pts |= ((unsigned long long)(packet[10]&0x80)) >> 7;
+                                       offset -= 188;
+                                       eDebug("PCR  found: %16llx", pts);
+                                       if (fixed && fixupPTS(offset, pts))
+                                               return -1;
+                                       return 0;
+                               }
+                       }
+                       payload = packet + packet[4] + 4 + 1;
+               } else
+                       payload = packet + 4;
+
                
                if (m_pid >= 0)
                        if (pid != m_pid)
                
                if (m_pid >= 0)
                        if (pid != m_pid)
@@ -114,33 +142,31 @@ int eDVBTSTools::getPTS(off_t &offset, pts_t &pts, int fixed)
                if (!pusi)
                        continue;
                
                if (!pusi)
                        continue;
                
-                       /* ok, now we have a PES header */
-               unsigned char *pes;
-               
-                       /* check for adaption field */
-               if (block[3] & 0x20)
-                       pes = block + block[4] + 4 + 1;
-               else
-                       pes = block + 4;
                
                        /* somehow not a startcode. (this is invalid, since pusi was set.) ignore it. */
                
                        /* somehow not a startcode. (this is invalid, since pusi was set.) ignore it. */
-               if (pes[0] || pes[1] || (pes[2] != 1))
+               if (payload[0] || payload[1] || (payload[2] != 1))
+                       continue;
+               
+                       /* drop non-audio, non-video packets because other streams
+                          can be non-compliant.*/
+               if (((payload[3] & 0xE0) != 0xC0) &&  // audio
+                   ((payload[3] & 0xF0) != 0xE0))    // video
                        continue;
                
                        continue;
                
-               if (pes[7] & 0x80) /* PTS */
+               if (payload[7] & 0x80) /* PTS */
                {
                {
-                       pts  = ((unsigned long long)(pes[ 9]&0xE))  << 29;
-                       pts |= ((unsigned long long)(pes[10]&0xFF)) << 22;
-                       pts |= ((unsigned long long)(pes[11]&0xFE)) << 14;
-                       pts |= ((unsigned long long)(pes[12]&0xFF)) << 7;
-                       pts |= ((unsigned long long)(pes[13]&0xFE)) >> 1;
+                       pts  = ((unsigned long long)(payload[ 9]&0xE))  << 29;
+                       pts |= ((unsigned long long)(payload[10]&0xFF)) << 22;
+                       pts |= ((unsigned long long)(payload[11]&0xFE)) << 14;
+                       pts |= ((unsigned long long)(payload[12]&0xFF)) << 7;
+                       pts |= ((unsigned long long)(payload[13]&0xFE)) >> 1;
                        offset -= 188;
 
                        offset -= 188;
 
-//                     eDebug("found pts %08llx at %08llx", pts, offset);
+                       eDebug("found pts %08llx at %08llx pid %02x stream: %02x", pts, offset, pid, payload[3]);
                        
                                /* convert to zero-based */
                        
                                /* convert to zero-based */
-                       if (fixed)
-                               fixupPTS(offset, pts);
+                       if (fixed && fixupPTS(offset, pts))
+                                       return -1;
                        return 0;
                }
        }
                        return 0;
                }
        }
@@ -186,8 +212,14 @@ int eDVBTSTools::getOffset(off_t &offset, pts_t &pts)
                return 0;
        } else
        {
                return 0;
        } else
        {
-//             eDebug("get offset");
+               eDebug("get offset: pts=%llx", pts);
                calcBegin(); calcEnd();
                calcBegin(); calcEnd();
+               
+               if (!m_begin_valid)
+                       return -1;
+               if (!m_end_valid)
+                       return -1;
+
                if (!m_samples_taken)
                        takeSamples();
                
                if (!m_samples_taken)
                        takeSamples();
                
@@ -215,11 +247,15 @@ int eDVBTSTools::getOffset(off_t &offset, pts_t &pts)
                                                --l;
                                        }
                                }
                                                --l;
                                        }
                                }
+                                       
+                                       /* if we don't have enough points */
+                               if (u == m_samples.end())
+                                       break;
                                
                                pts_t pts_diff = u->first - l->first;
                                off_t offset_diff = u->second - l->second;
 
                                
                                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);
+                               eDebug("using: %llx:%llx -> %llx:%llx", l->first, u->first, l->second, u->second);
 
                                int bitrate;
                                
 
                                int bitrate;
                                
@@ -233,6 +269,8 @@ int eDVBTSTools::getOffset(off_t &offset, pts_t &pts)
                                offset -= offset % 188;
                                
                                p = pts;
                                offset -= offset % 188;
                                
                                p = pts;
+                               
+                               eDebug("so next guess at %llx", offset);
                        
                                if (!takeSample(offset, p))
                                {
                        
                                if (!takeSample(offset, p))
                                {
@@ -388,9 +426,9 @@ void eDVBTSTools::takeSamples()
        
        int nr_samples = 30;
        off_t bytes_per_sample = (m_offset_end - m_offset_begin) / (long long)nr_samples;
        
        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;
-       
+       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)
        bytes_per_sample -= bytes_per_sample % 188;
        
        for (off_t offset = m_offset_begin; offset < m_offset_end; offset += bytes_per_sample)
@@ -398,17 +436,19 @@ void eDVBTSTools::takeSamples()
                pts_t p;
                takeSample(offset, p);
        }
                pts_t p;
                takeSample(offset, p);
        }
-       m_samples[m_pts_begin] = m_offset_begin;
-       m_samples[m_pts_end] = m_offset_end;
+       m_samples[0] = m_offset_begin;
+       m_samples[m_pts_end - m_pts_begin] = m_offset_end;
+       
 //     eDebug("begin, end: %llx %llx", m_offset_begin, m_offset_end); 
 }
 
        /* returns 0 when a sample was taken. */
 int eDVBTSTools::takeSample(off_t off, pts_t &p)
 {
 //     eDebug("begin, end: %llx %llx", m_offset_begin, m_offset_end); 
 }
 
        /* returns 0 when a sample was taken. */
 int eDVBTSTools::takeSample(off_t off, pts_t &p)
 {
+       eDebug("take sample: %llx", off);
        if (!eDVBTSTools::getPTS(off, p, 1))
        {
        if (!eDVBTSTools::getPTS(off, p, 1))
        {
-               eDebug("sample: %llx, %llx", off, p);
+               eDebug("took sample: %llx, %llx", off, p);
                m_samples[p] = off;
                return 0;
        }
                m_samples[p] = off;
                return 0;
        }
@@ -434,20 +474,20 @@ int eDVBTSTools::findPMT(int &pmt_pid, int &service_id)
        
        while (left >= 188)
        {
        
        while (left >= 188)
        {
-               unsigned char block[188];
-               if (m_file.read(block, 188) != 188)
+               unsigned char packet[188];
+               if (m_file.read(packet, 188) != 188)
                {
                        eDebug("read error");
                        break;
                }
                left -= 188;
                
                {
                        eDebug("read error");
                        break;
                }
                left -= 188;
                
-               if (block[0] != 0x47)
+               if (packet[0] != 0x47)
                {
                        int i = 0;
                        while (i < 188)
                        {
                {
                        int i = 0;
                        while (i < 188)
                        {
-                               if (block[i] == 0x47)
+                               if (packet[i] == 0x47)
                                        break;
                                ++i;
                        }
                                        break;
                                ++i;
                        }
@@ -455,9 +495,9 @@ int eDVBTSTools::findPMT(int &pmt_pid, int &service_id)
                        continue;
                }
                
                        continue;
                }
                
-               int pid = ((block[1] << 8) | block[2]) & 0x1FFF;
+               int pid = ((packet[1] << 8) | packet[2]) & 0x1FFF;
                
                
-               int pusi = !!(block[1] & 0x40);
+               int pusi = !!(packet[1] & 0x40);
                
                if (!pusi)
                        continue;
                
                if (!pusi)
                        continue;
@@ -466,10 +506,13 @@ int eDVBTSTools::findPMT(int &pmt_pid, int &service_id)
                unsigned char *sec;
                
                        /* check for adaption field */
                unsigned char *sec;
                
                        /* check for adaption field */
-               if (block[3] & 0x20)
-                       sec = block + block[4] + 4 + 1;
-               else
-                       sec = block + 4;
+               if (packet[3] & 0x20)
+               {
+                       if (packet[4] >= 183)
+                               continue;
+                       sec = packet + packet[4] + 4 + 1;
+               } else
+                       sec = packet + 4;
                
                if (sec[0])     /* table pointer, assumed to be 0 */
                        continue;
                
                if (sec[0])     /* table pointer, assumed to be 0 */
                        continue;