1 #include <lib/dvb/tstools.h>
2 #include <lib/base/eerror.h>
8 eDVBTSTools::eDVBTSTools()
12 m_maxrange = 256*1024;
20 eDVBTSTools::~eDVBTSTools()
25 int eDVBTSTools::openFile(const char *filename)
29 m_streaminfo.load((std::string(filename) + ".ap").c_str());
31 if (!m_streaminfo.empty())
35 eDebug("no recorded stream information available");
39 m_fd = ::open(filename, O_RDONLY);
45 void eDVBTSTools::closeFile()
51 void eDVBTSTools::setSyncPID(int pid)
56 void eDVBTSTools::setSearchRange(int maxrange)
58 m_maxrange = maxrange;
61 /* getPTS extracts a pts value from any PID at a given offset. */
62 int eDVBTSTools::getPTS(off_t &offset, pts_t &pts, int fixed)
65 return m_streaminfo.getPTS(offset, pts);
70 offset -= offset % 188;
72 // TODO: multiple files!
73 if (lseek(m_fd, offset, SEEK_SET) < 0)
76 int left = m_maxrange;
80 unsigned char block[188];
81 if (read(m_fd, block, 188) != 188)
98 offset = lseek(m_fd, i - 188, SEEK_CUR);
102 int pid = ((block[1] << 8) | block[2]) & 0x1FFF;
103 int pusi = !!(block[1] & 0x40);
105 // printf("PID %04x, PUSI %d\n", pid, pusi);
113 /* ok, now we have a PES header */
116 /* check for adaption field */
118 pes = block + block[4] + 4 + 1;
122 /* somehow not a startcode. (this is invalid, since pusi was set.) ignore it. */
123 if (pes[0] || pes[1] || (pes[2] != 1))
126 if (pes[7] & 0x80) /* PTS */
128 pts = ((unsigned long long)(pes[ 9]&0xE)) << 29;
129 pts |= ((unsigned long long)(pes[10]&0xFF)) << 22;
130 pts |= ((unsigned long long)(pes[11]&0xFE)) << 14;
131 pts |= ((unsigned long long)(pes[12]&0xFF)) << 7;
132 pts |= ((unsigned long long)(pes[13]&0xFE)) >> 1;
135 /* convert to zero-based */
137 fixupPTS(offset, pts);
145 int eDVBTSTools::fixupPTS(const off_t &offset, pts_t &now)
147 if (m_use_streaminfo)
149 return m_streaminfo.fixupPTS(offset, now);
152 /* for the simple case, we assume one epoch, with up to one wrap around in the middle. */
156 eDebug("begin not valid, can't fixup");
160 pts_t pos = m_pts_begin;
161 if ((now < pos) && ((pos - now) < 90000 * 10))
167 if (now < pos) /* wrap around */
168 now = now + 0x200000000LL - pos;
175 void eDVBTSTools::calcBegin()
183 if (!getPTS(m_offset_begin, m_pts_begin))
188 void eDVBTSTools::calcEnd()
193 off_t end = lseek(m_fd, 0, SEEK_END);
195 if (abs(end - m_offset_end) > 1*1024*1024)
199 eDebug("file size changed, recalc length");
209 m_offset_end -= m_maxrange;
210 if (m_offset_end < 0)
212 if (!getPTS(m_offset_end, m_pts_end))
219 int eDVBTSTools::calcLen(pts_t &len)
221 calcBegin(); calcEnd();
222 if (!(m_begin_valid && m_end_valid))
224 len = m_pts_end - m_pts_begin;
227 len += 0x200000000LL;
231 int eDVBTSTools::calcBitrate()
233 calcBegin(); calcEnd();
234 if (!(m_begin_valid && m_end_valid))
237 pts_t len_in_pts = m_pts_end - m_pts_begin;
241 len_in_pts += 0x200000000LL;
242 off_t len_in_bytes = m_offset_end - m_offset_begin;
247 unsigned long long bitrate = len_in_bytes * 90000 * 8 / len_in_pts;
248 if ((bitrate < 10000) || (bitrate > 100000000))