X-Git-Url: https://git.cweiske.de/enigma2.git/blobdiff_plain/76fdfb7ae5768596a8916b272fe980d03e0a9630..d6df38ffdd575880994170db75ce93480fb618f8:/lib/dvb/tstools.cpp diff --git a/lib/dvb/tstools.cpp b/lib/dvb/tstools.cpp index 4ee26265..b47de868 100644 --- a/lib/dvb/tstools.cpp +++ b/lib/dvb/tstools.cpp @@ -26,17 +26,18 @@ eDVBTSTools::~eDVBTSTools() closeFile(); } -int eDVBTSTools::openFile(const char *filename) +int eDVBTSTools::openFile(const char *filename, int nostreaminfo) { closeFile(); - m_streaminfo.load((std::string(filename) + ".ap").c_str()); + if (!nostreaminfo) + m_streaminfo.load((std::string(filename) + ".ap").c_str()); if (!m_streaminfo.empty()) m_use_streaminfo = 1; else { - eDebug("no recorded stream information available"); +// eDebug("no recorded stream information available"); m_use_streaminfo = 0; } @@ -80,8 +81,8 @@ int eDVBTSTools::getPTS(off_t &offset, pts_t &pts, int fixed) 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; @@ -89,12 +90,12 @@ int eDVBTSTools::getPTS(off_t &offset, pts_t &pts, int fixed) left -= 188; offset += 188; - if (block[0] != 0x47) + if (packet[0] != 0x47) { int i = 0; while (i < 188) { - if (block[i] == 0x47) + if (packet[i] == 0x47) break; ++i; } @@ -102,10 +103,38 @@ int eDVBTSTools::getPTS(off_t &offset, pts_t &pts, int fixed) 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); + + 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) @@ -113,33 +142,31 @@ int eDVBTSTools::getPTS(off_t &offset, pts_t &pts, int fixed) 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. */ - 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; - 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; - -// 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 */ - if (fixed) - fixupPTS(offset, pts); + if (fixed && fixupPTS(offset, pts)) + return -1; return 0; } } @@ -185,37 +212,88 @@ int eDVBTSTools::getOffset(off_t &offset, pts_t &pts) return 0; } else { -// eDebug("get offset"); + eDebug("get offset: pts=%llx", pts); + calcBegin(); calcEnd(); + + if (!m_begin_valid) + return -1; + if (!m_end_valid) + return -1; + if (!m_samples_taken) takeSamples(); if (!m_samples.empty()) { -// eDebug("ok, samples ok"); - /* search entry before and after */ - std::map::const_iterator l = m_samples.lower_bound(pts); - std::map::const_iterator u = l; - - if (l != m_samples.begin()) - --l; - - if ((u != m_samples.end()) && (l != m_samples.end())) + int maxtries = 5; + pts_t p = -1; + + while (maxtries--) { + /* search entry before and after */ + std::map::const_iterator l = m_samples.lower_bound(pts); + std::map::const_iterator u = l; + + if (l != m_samples.begin()) + --l; + + /* we could have seeked beyond the end */ + if (u == m_samples.end()) + { + /* use last segment for interpolation. */ + if (l != m_samples.begin()) + { + --u; + --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; -// 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; + if (pts_diff) + bitrate = offset_diff * 90000 * 8 / pts_diff; + else + bitrate = 0; + + offset = l->second; + offset += ((pts - l->first) * (pts_t)bitrate) / 8ULL / 90000ULL; + offset -= offset % 188; + + p = pts; + + eDebug("so next guess at %llx", offset); + + if (!takeSample(offset, p)) { - int bitrate = offset_diff * 90000 * 8 / pts_diff; - if (bitrate > 0) + int diff = (p - pts) / 90; + + eDebug("calculated diff %d ms", diff); + if (abs(diff) > 300) { - offset = l->second; - offset += ((pts - l->first) * (pts_t)bitrate) / 8ULL / 90000ULL; - offset -= offset % 188; - return 0; + eDebug("diff to big, refining"); + continue; } - } + } else + eDebug("no sample taken, refinement not possible."); + + break; + } + + /* if even the first sample couldn't be taken, fall back. */ + /* otherwise, return most refined result. */ + if (p != -1) + { + pts = p; + return 0; } } @@ -223,7 +301,7 @@ int eDVBTSTools::getOffset(off_t &offset, pts_t &pts) int bitrate = calcBitrate(); offset = pts * (pts_t)bitrate / 8ULL / 90000ULL; offset -= offset % 188; - + return 0; } } @@ -267,7 +345,7 @@ void eDVBTSTools::calcEnd() m_end_valid = 0; m_futile = 0; - eDebug("file size changed, recalc length"); +// eDebug("file size changed, recalc length"); } int maxiter = 10; @@ -350,24 +428,33 @@ void eDVBTSTools::takeSamples() 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; - + bytes_per_sample -= bytes_per_sample % 188; for (off_t offset = m_offset_begin; offset < m_offset_end; offset += bytes_per_sample) { - off_t o = offset; pts_t p; - if (!eDVBTSTools::getPTS(o, p, 1)) - { -// eDebug("sample: %llx, %llx", o, p); - m_samples[p] = o; - } + 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("take sample: %llx", off); + if (!eDVBTSTools::getPTS(off, p, 1)) + { + eDebug("took sample: %llx, %llx", off, p); + m_samples[p] = off; + return 0; + } + return 1; +} + int eDVBTSTools::findPMT(int &pmt_pid, int &service_id) { /* FIXME: this will be factored out soon! */ @@ -387,20 +474,20 @@ int eDVBTSTools::findPMT(int &pmt_pid, int &service_id) 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; - if (block[0] != 0x47) + if (packet[0] != 0x47) { int i = 0; while (i < 188) { - if (block[i] == 0x47) + if (packet[i] == 0x47) break; ++i; } @@ -408,9 +495,9 @@ int eDVBTSTools::findPMT(int &pmt_pid, int &service_id) 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; @@ -419,10 +506,13 @@ int eDVBTSTools::findPMT(int &pmt_pid, int &service_id) 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;