remove unused variable 'delta'
[openblackhole/openblackhole-enigma2.git] / lib / dvb / pvrparse.cpp
1 #include <lib/dvb/pvrparse.h>
2 #include <lib/base/eerror.h>
3 #include <byteswap.h>
4
5 #ifndef BYTE_ORDER
6 #error no byte order defined!
7 #endif
8
9 int eMPEGStreamInformation::save(const char *filename)
10 {
11         FILE *f = fopen(filename, "wb");
12         if (!f)
13                 return -1;
14         
15         for (std::map<off_t, pts_t>::const_iterator i(m_access_points.begin()); i != m_access_points.end(); ++i)
16         {
17                 unsigned long long d[2];
18 #if BYTE_ORDER == BIG_ENDIAN
19                 d[0] = i->first;
20                 d[1] = i->second;
21 #else
22                 d[0] = bswap_64(i->first);
23                 d[1] = bswap_64(i->second);
24 #endif
25                 fwrite(d, sizeof(d), 1, f);
26         }
27         fclose(f);
28         
29         return 0;
30 }
31
32 int eMPEGStreamInformation::load(const char *filename)
33 {
34         FILE *f = fopen(filename, "rb");
35         if (!f)
36                 return -1;
37         m_access_points.clear();
38         m_pts_to_offset.clear();
39         pts_t last = -(1LL<<62);
40         int loaded = 0, skipped = 0;
41         while (1)
42         {
43                 unsigned long long d[2];
44                 if (fread(d, sizeof(d), 1, f) < 1)
45                         break;
46                 
47 #if BYTE_ORDER == LITTLE_ENDIAN
48                 d[0] = bswap_64(d[0]);
49                 d[1] = bswap_64(d[1]);
50 #endif
51                 if ((d[1] - last) > 90000/2)
52                 {
53                         m_access_points[d[0]] = d[1];
54                         m_pts_to_offset.insert(std::pair<pts_t,off_t>(d[1], d[0]));
55                         last = d[1];
56                         loaded++;
57                 } else
58                         skipped++;
59         }
60         eDebug("loaded %d, skipped %d", loaded, skipped);
61         fclose(f);
62         fixupDiscontinuties();
63         return 0;
64 }
65
66 bool eMPEGStreamInformation::empty()
67 {
68         return m_access_points.empty();
69 }
70
71 void eMPEGStreamInformation::fixupDiscontinuties()
72 {
73         m_timestamp_deltas.clear();
74         if (!m_access_points.size())
75                 return;
76                 
77 //      eDebug("Fixing discontinuities ...");
78
79                         /* if we have no delta at the beginning, extrapolate it */
80         if ((m_access_points.find(0) == m_access_points.end()) && (m_access_points.size() > 1))
81         {
82                 std::map<off_t,pts_t>::const_iterator second = m_access_points.begin();
83                 std::map<off_t,pts_t>::const_iterator first  = second++;
84                 if (first->first < second->first) /* i.e., not equal or broken */
85                 {
86                         off_t diff = second->first - first->first;
87                         pts_t tdiff = second->second - first->second;
88                         tdiff *= first->first;
89                         tdiff /= diff;
90                         m_timestamp_deltas[0] = first->second - tdiff;
91 //                      eDebug("first delta is %08llx", first->second - tdiff);
92                 }
93         }
94
95         if (m_timestamp_deltas.empty())
96                 m_timestamp_deltas[m_access_points.begin()->first] = m_access_points.begin()->second;
97
98         pts_t currentDelta = m_timestamp_deltas.begin()->second, lastpts_t = 0;
99         for (std::map<off_t,pts_t>::const_iterator i(m_access_points.begin()); i != m_access_points.end(); ++i)
100         {
101                 pts_t current = i->second - currentDelta;
102                 pts_t diff = current - lastpts_t;
103                 
104                 if (llabs(diff) > (90000*5)) // 5sec diff
105                 {
106 //                      eDebug("%llx < %llx, have discont. new timestamp is %llx (diff is %llx)!", current, lastpts_t, i->second, diff);
107                         currentDelta = i->second - lastpts_t; /* FIXME: should be the extrapolated new timestamp, based on the current rate */
108 //                      eDebug("current delta now %llx, making current to %llx", currentDelta, i->second - currentDelta);
109                         m_timestamp_deltas[i->first] = currentDelta;
110                 }
111                 lastpts_t = i->second - currentDelta;
112         }
113         
114         
115 //      eDebug("ok, found %d disconts.", m_timestamp_deltas.size());
116
117 #if 0   
118         for (off_t x=0x25807E34ULL; x < 0x25B3CF70; x+= 100000)
119         {
120                 off_t o = x;
121                 pts_t p;
122                 int r = getPTS(o, p);
123                 eDebug("%08llx -> %08llx | %08llx, %d, %08llx %08llx", x, getDelta(x), getInterpolated(x), r, o, p);
124         }
125 #endif
126 }
127
128 pts_t eMPEGStreamInformation::getDelta(off_t offset)
129 {
130         if (!m_timestamp_deltas.size())
131                 return 0;
132         std::map<off_t,pts_t>::iterator i = m_timestamp_deltas.upper_bound(offset);
133
134                 /* i can be the first when you query for something before the first PTS */
135         if (i != m_timestamp_deltas.begin())
136                 --i;
137
138         return i->second;
139 }
140
141 int eMPEGStreamInformation::fixupPTS(const off_t &offset, pts_t &ts)
142 {
143         if (!m_timestamp_deltas.size())
144                 return -1;
145
146         std::multimap<pts_t, off_t>::const_iterator 
147                 l = m_pts_to_offset.upper_bound(ts - 60 * 90000), 
148                 u = m_pts_to_offset.upper_bound(ts + 60 * 90000), 
149                 nearest = m_pts_to_offset.end();
150
151         while (l != u)
152         {
153                 if ((nearest == m_pts_to_offset.end()) || (llabs(l->first - ts) < llabs(nearest->first - ts)))
154                         nearest = l;
155                 ++l;
156         }
157         if (nearest == m_pts_to_offset.end())
158                 return 1;
159
160         ts -= getDelta(nearest->second);
161
162         return 0;
163 }
164
165 int eMPEGStreamInformation::getPTS(off_t &offset, pts_t &pts)
166 {
167         std::map<off_t,pts_t>::iterator before = m_access_points.lower_bound(offset);
168
169                 /* usually, we prefer the AP before the given offset. however if there is none, we take any. */
170         if (before != m_access_points.begin())
171                 --before;
172         
173         if (before == m_access_points.end())
174         {
175                 pts = 0;
176                 return -1;
177         }
178         
179         offset = before->first;
180         pts = before->second - getDelta(offset);
181         
182         return 0;
183 }
184
185 pts_t eMPEGStreamInformation::getInterpolated(off_t offset)
186 {
187                 /* get the PTS values before and after the offset. */
188         std::map<off_t,pts_t>::iterator before, after;
189         after = m_access_points.upper_bound(offset);
190         before = after;
191
192         if (before != m_access_points.begin())
193                 --before;
194         else    /* we query before the first known timestamp ... FIXME */
195                 return 0;
196
197                 /* empty... */
198         if (before == m_access_points.end())
199                 return 0;
200
201                 /* if after == end, then we need to extrapolate ... FIXME */
202         if ((before->first == offset) || (after == m_access_points.end()))
203                 return before->second - getDelta(offset);
204         
205         pts_t before_ts = before->second - getDelta(before->first);
206         pts_t after_ts = after->second - getDelta(after->first);
207         
208 //      eDebug("%08llx .. ? .. %08llx", before_ts, after_ts);
209 //      eDebug("%08llx .. %08llx .. %08llx", before->first, offset, after->first);
210         
211         pts_t diff = after_ts - before_ts;
212         off_t diff_off = after->first - before->first;
213         
214         diff = (offset - before->first) * diff / diff_off;
215 //      eDebug("%08llx .. %08llx .. %08llx", before_ts, before_ts + diff, after_ts);
216         return before_ts + diff;
217 }
218  
219 off_t eMPEGStreamInformation::getAccessPoint(pts_t ts)
220 {
221                 /* FIXME: more efficient implementation */
222         off_t last = 0;
223         for (std::map<off_t, pts_t>::const_iterator i(m_access_points.begin()); i != m_access_points.end(); ++i)
224         {
225                 pts_t delta = getDelta(i->first);
226                 pts_t c = i->second - delta;
227                 if (c > ts)
228                         break;
229                 last = i->first;
230         }
231         return last;
232 }
233
234 int eMPEGStreamInformation::getNextAccessPoint(pts_t &ts, const pts_t &start, int direction)
235 {
236         off_t offset = getAccessPoint(start);
237         std::map<off_t, pts_t>::const_iterator i = m_access_points.find(offset);
238         if (i == m_access_points.end())
239         {
240                 eDebug("getNextAccessPoint: initial AP not found");
241                 return -1;
242         }
243         while (direction)
244         {
245                 if (direction > 0)
246                 {
247                         if (i == m_access_points.end())
248                                 return -1;
249                         ++i;
250                         direction--;
251                 }
252                 if (direction < 0)
253                 {
254                         if (i == m_access_points.begin())
255                         {
256                                 eDebug("at start");
257                                 return -1;
258                         }
259                         --i;
260                         direction++;
261                 }
262         }
263         ts = i->second - getDelta(i->first);
264         eDebug("fine, at %llx - %llx = %llx", ts, i->second, getDelta(i->first));
265         eDebug("fine, at %lld - %lld = %lld", ts, i->second, getDelta(i->first));
266         return 0;
267 }
268
269 eMPEGStreamParserTS::eMPEGStreamParserTS(eMPEGStreamInformation &streaminfo): m_streaminfo(streaminfo), m_pktptr(0), m_pid(-1), m_need_next_packet(0), m_skip(0)
270 {
271 }
272
273 int eMPEGStreamParserTS::processPacket(const unsigned char *pkt, off_t offset)
274 {
275         if (!wantPacket(pkt))
276                 eWarning("something's wrong.");
277
278         const unsigned char *end = pkt + 188;
279         
280         if (!(pkt[3] & 0x10))
281         {
282                 eWarning("[TSPARSE] PUSI set but no payload.");
283                 return 0;
284         }
285         
286         if (pkt[3] & 0x20) // adaption field present?
287                 pkt += pkt[4] + 4 + 1;  /* skip adaption field and header */
288         else
289                 pkt += 4; /* skip header */
290
291         if (pkt > end)
292         {
293                 eWarning("[TSPARSE] dropping huge adaption field");
294                 return 0;
295         }
296         
297                 // ok, we now have the start of the payload, aligned with the PES packet start.
298         if (pkt[0] || pkt[1] || (pkt[2] != 1))
299         {
300                 eWarning("broken startcode");
301                 return 0;
302         }
303         
304         
305         pts_t pts = 0;
306         int ptsvalid = 0;
307         
308         if (pkt[7] & 0x80) // PTS present?
309         {
310                 pts  = ((unsigned long long)(pkt[ 9]&0xE))  << 29;
311                 pts |= ((unsigned long long)(pkt[10]&0xFF)) << 22;
312                 pts |= ((unsigned long long)(pkt[11]&0xFE)) << 14;
313                 pts |= ((unsigned long long)(pkt[12]&0xFF)) << 7;
314                 pts |= ((unsigned long long)(pkt[13]&0xFE)) >> 1;
315                 ptsvalid = 1;
316
317 #if 0           
318                 int sec = pts / 90000;
319                 int frm = pts % 90000;
320                 int min = sec / 60;
321                 sec %= 60;
322                 int hr = min / 60;
323                 min %= 60;
324                 int d = hr / 24;
325                 hr %= 24;
326                 
327                 eDebug("pts: %016llx %d:%02d:%02d:%02d:%05d", pts, d, hr, min, sec, frm);
328 #endif
329         }
330         
331                 /* advance to payload */
332         pkt += pkt[8] + 9;
333
334                 /* sometimes, there are zeros before the startcode. */
335         while (pkt < (end-4))
336                 if (pkt[0] || pkt[1] || pkt[2])
337                         break;
338                 else
339                         pkt++;
340
341                 /* if startcode found */
342 //      eDebug("%02x %02x %02x %02x", pkt[0], pkt[1], pkt[2], pkt[3]);
343         if (!(pkt[0] || pkt[1] || (pkt[2] != 1)))
344         {
345                 if (pkt[3] == 0xb3) /* sequence header */
346                 {
347                         if (ptsvalid)
348                         {
349                                 m_streaminfo.m_access_points[offset] = pts;
350                                 eDebug("Sequence header at %llx, pts %llx", offset, pts);
351                         } else
352                                 eDebug("Sequence header but no valid PTS value.");
353                 }
354
355                 if (pkt[3] == 0x09) /* MPEG4 AVC unit access delimiter */
356                 {
357                         if (ptsvalid)
358                         {
359                                 m_streaminfo.m_access_points[offset] = pts;
360                                 eDebug("MPEG4 AVC UAD at %llx, pts %llx", offset, pts);
361                         } else
362                                 eDebug("MPEG4 AVC UAD but no valid PTS value.");
363                 }
364         }
365         return 0;
366 }
367
368 inline int eMPEGStreamParserTS::wantPacket(const unsigned char *hdr) const
369 {
370         if (hdr[0] != 0x47)
371         {
372                 eDebug("missing sync!");
373                 return 0;
374         }
375         int ppid = ((hdr[1]&0x1F) << 8) | hdr[2];
376
377         if (ppid != m_pid)
378                 return 0;
379                 
380         if (m_need_next_packet)  /* next packet (on this pid) was required? */
381                 return 1;
382         
383         if (hdr[1] & 0x40)       /* pusi set: yes. */
384                 return 1;
385
386         return 0;
387 }
388
389 void eMPEGStreamParserTS::parseData(off_t offset, const void *data, unsigned int len)
390 {
391         const unsigned char *packet = (const unsigned char*)data;
392         const unsigned char *packet_start = packet;
393         
394                         /* sorry for the redundant code here, but there are too many special cases... */
395         while (len)
396         {
397                         /* emergency resync. usually, this should not happen, because the data should 
398                            be sync-aligned.
399                            
400                            to make this code work for non-strictly-sync-aligned data, (for example, bad 
401                            files) we fix a possible resync here by skipping data until the next 0x47.
402                            
403                            if this is a false 0x47, the packet will be dropped by wantPacket, and the
404                            next time, sync will be re-established. */
405                 int skipped = 0;
406                 while (!m_pktptr && len)
407                 {
408                         if (packet[0] == 0x47)
409                                 break;
410                         len--;
411                         packet++;
412                         skipped++;
413                 }
414                 
415                 if (skipped)
416                         eDebug("SYNC LOST: skipped %d bytes.", skipped);
417                 
418                 if (!len)
419                         break;
420                 
421                 if (m_pktptr)
422                 {
423                                 /* skip last packet */
424                         if (m_pktptr < 0)
425                         {
426                                 unsigned int skiplen = -m_pktptr;
427                                 if (skiplen > len)
428                                         skiplen = len;
429                                 packet += skiplen;
430                                 len -= skiplen;
431                                 m_pktptr += skiplen;
432                                 continue;
433                         } else if (m_pktptr < 4) /* header not complete, thus we don't know if we want this packet */
434                         {
435                                 unsigned int storelen = 4 - m_pktptr;
436                                 if (storelen > len)
437                                         storelen = len;
438                                 memcpy(m_pkt + m_pktptr, packet,  storelen);
439                                 
440                                 m_pktptr += storelen;
441                                 len -= storelen;
442                                 packet += storelen;
443                                 
444                                 if (m_pktptr == 4)
445                                         if (!wantPacket(m_pkt))
446                                         {
447                                                         /* skip packet */
448                                                 packet += 184;
449                                                 len -= 184;
450                                                 m_pktptr = 0;
451                                                 continue;
452                                         }
453                         }
454                                 /* otherwise we complete up to the full packet */
455                         unsigned int storelen = 188 - m_pktptr;
456                         if (storelen > len)
457                                 storelen = len;
458                         memcpy(m_pkt + m_pktptr, packet,  storelen);
459                         m_pktptr += storelen;
460                         len -= storelen;
461                         packet += storelen;
462                         
463                         if (m_pktptr == 188)
464                         {
465                                 m_need_next_packet = processPacket(m_pkt, offset + (packet - packet_start));
466                                 m_pktptr = 0;
467                         }
468                 } else if (len >= 4)  /* if we have a full header... */
469                 {
470                         if (wantPacket(packet))  /* decide wheter we need it ... */
471                         {
472                                 if (len >= 188)          /* packet complete? */
473                                 {
474                                         m_need_next_packet = processPacket(packet, offset + (packet - packet_start)); /* process it now. */
475                                 } else
476                                 {
477                                         memcpy(m_pkt, packet, len);  /* otherwise queue it up */
478                                         m_pktptr = len;
479                                 }
480                         }
481
482                                 /* skip packet */
483                         int sk = len;
484                         if (sk >= 188)
485                                 sk = 188;
486                         else if (!m_pktptr) /* we dont want this packet, otherwise m_pktptr = sk (=len) > 4 */
487                                 m_pktptr = sk - 188;
488
489                         len -= sk;
490                         packet += sk;
491                 } else             /* if we don't have a complete header */
492                 {
493                         memcpy(m_pkt, packet, len);   /* complete header next time */
494                         m_pktptr = len;
495                         packet += len;
496                         len = 0;
497                 }
498         }
499 }
500
501 void eMPEGStreamParserTS::setPid(int _pid)
502 {
503         m_pktptr = 0;
504         m_pid = _pid;
505 }