#include <lib/dvb/tstools.h>
+#include <lib/base/eerror.h>
#include <unistd.h>
#include <fcntl.h>
eDVBTSTools::eDVBTSTools()
{
- m_fd = -1;
m_pid = -1;
- m_maxrange = 1*1024*1024;
+ m_maxrange = 256*1024;
m_begin_valid = 0;
m_end_valid = 0;
+
+ m_use_streaminfo = 0;
+ m_samples_taken = 0;
}
eDVBTSTools::~eDVBTSTools()
int eDVBTSTools::openFile(const char *filename)
{
closeFile();
- m_fd = ::open(filename, O_RDONLY);
- if (m_fd < 0)
+
+ m_streaminfo.load((std::string(filename) + ".ap").c_str());
+
+ if (!m_streaminfo.empty())
+ m_use_streaminfo = 1;
+ else
+ {
+ eDebug("no recorded stream information available");
+ m_use_streaminfo = 0;
+ }
+
+ m_samples_taken = 0;
+
+ if (m_file.open(filename, 1) < 0)
return -1;
return 0;
}
void eDVBTSTools::closeFile()
{
- if (m_fd >= 0)
- ::close(m_fd);
+ m_file.close();
}
void eDVBTSTools::setSyncPID(int pid)
m_maxrange = maxrange;
}
-int eDVBTSTools::getPTS(off_t &offset, pts_t &pts)
+ /* getPTS extracts a pts value from any PID at a given offset. */
+int eDVBTSTools::getPTS(off_t &offset, pts_t &pts, int fixed)
{
- if (m_fd < 0)
- return -1;
- if (m_pid < 0)
+ if (m_use_streaminfo)
+ return m_streaminfo.getPTS(offset, pts);
+
+ if (!m_file.valid())
return -1;
offset -= offset % 188;
- // TODO: multiple files!
- if (lseek(m_fd, offset, SEEK_SET) < 0)
+ if (m_file.lseek(offset, SEEK_SET) < 0)
return -1;
int left = m_maxrange;
while (left >= 188)
{
unsigned char block[188];
- if (read(m_fd, block, 188) != 188)
+ if (m_file.read(block, 188) != 188)
+ {
+ eDebug("read error");
break;
+ }
left -= 188;
offset += 188;
{
int i = 0;
while (i < 188)
+ {
if (block[i] == 0x47)
break;
- offset = lseek(m_fd, i - 188, SEEK_CUR);
+ ++i;
+ }
+ offset = m_file.lseek(i - 188, SEEK_CUR);
continue;
}
// printf("PID %04x, PUSI %d\n", pid, pusi);
- if (pid != m_pid)
- continue;
+ if (m_pid >= 0)
+ if (pid != m_pid)
+ continue;
if (!pusi)
continue;
unsigned char *pes;
/* check for adaption field */
- if (block[3] & 0x10)
+ if (block[3] & 0x20)
pes = block + block[4] + 4 + 1;
else
pes = block + 4;
pts |= ((unsigned long long)(pes[12]&0xFF)) << 7;
pts |= ((unsigned long long)(pes[13]&0xFE)) >> 1;
offset -= 188;
+
+// eDebug("found pts %08llx at %08llx", pts, offset);
+
+ /* convert to zero-based */
+ if (fixed)
+ fixupPTS(offset, pts);
return 0;
}
}
-
+
return -1;
}
+int eDVBTSTools::fixupPTS(const off_t &offset, pts_t &now)
+{
+ if (m_use_streaminfo)
+ {
+ return m_streaminfo.fixupPTS(offset, now);
+ } else
+ {
+ /* for the simple case, we assume one epoch, with up to one wrap around in the middle. */
+ calcBegin();
+ if (!m_begin_valid)
+ {
+ eDebug("begin not valid, can't fixup");
+ return -1;
+ }
+
+ pts_t pos = m_pts_begin;
+ if ((now < pos) && ((pos - now) < 90000 * 10))
+ {
+ pos = 0;
+ return 0;
+ }
+
+ if (now < pos) /* wrap around */
+ now = now + 0x200000000LL - pos;
+ else
+ now -= pos;
+ return 0;
+ }
+}
+
+int eDVBTSTools::getOffset(off_t &offset, pts_t &pts)
+{
+ if (m_use_streaminfo)
+ {
+ offset = m_streaminfo.getAccessPoint(pts);
+ return 0;
+ } else
+ {
+// eDebug("get offset");
+ if (!m_samples_taken)
+ takeSamples();
+
+ if (!m_samples.empty())
+ {
+// eDebug("ok, samples ok");
+ /* search entry before and after */
+ std::map<pts_t, off_t>::const_iterator l = m_samples.lower_bound(pts);
+ std::map<pts_t, off_t>::const_iterator u = l;
+
+ if (l != m_samples.begin())
+ --l;
+
+ if ((u != m_samples.end()) && (l != m_samples.end()))
+ {
+ 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);
+
+ if (pts_diff)
+ {
+ int bitrate = offset_diff * 90000 * 8 / pts_diff;
+ if (bitrate > 0)
+ {
+ offset = l->second;
+ offset += ((pts - l->first) * (pts_t)bitrate) / 8ULL / 90000ULL;
+ offset -= offset % 188;
+ return 0;
+ }
+ }
+ }
+ }
+
+ eDebug("falling back");
+ int bitrate = calcBitrate();
+ offset = pts * (pts_t)bitrate / 8ULL / 90000ULL;
+ offset -= offset % 188;
+
+ return 0;
+ }
+}
+
+int eDVBTSTools::getNextAccessPoint(pts_t &ts, const pts_t &start, int direction)
+{
+ if (m_use_streaminfo)
+ return m_streaminfo.getNextAccessPoint(ts, start, direction);
+ else
+ {
+ eDebug("can't get next access point without streaminfo");
+ return -1;
+ }
+}
+
void eDVBTSTools::calcBegin()
{
- if (m_fd < 0)
+ if (!m_file.valid())
return;
+
if (!m_begin_valid)
{
m_offset_begin = 0;
void eDVBTSTools::calcEnd()
{
- if (m_fd < 0)
+ if (!m_file.valid())
return;
- if (!m_end_valid)
+ off_t end = m_file.lseek(0, SEEK_END);
+
+ if (abs(end - m_offset_end) > 1*1024*1024)
+ {
+ m_offset_end = end;
+ m_end_valid = 0;
+ eDebug("file size changed, recalc length");
+ }
+
+ int maxiter = 10;
+
+ while (!m_end_valid)
{
- m_offset_end = lseek(m_fd, 0, SEEK_END) - m_maxrange;
+ if (!--maxiter)
+ return;
+
+ m_offset_end -= m_maxrange;
+ if (m_offset_end < 0)
+ m_offset_end = 0;
if (!getPTS(m_offset_end, m_pts_end))
m_end_valid = 1;
+ if (!m_offset_end)
+ return;
}
}
if (!(m_begin_valid && m_end_valid))
return -1;
len = m_pts_end - m_pts_begin;
+ /* wrap around? */
+ if (len < 0)
+ len += 0x200000000LL;
return 0;
}
+int eDVBTSTools::calcBitrate()
+{
+ calcBegin(); calcEnd();
+ if (!(m_begin_valid && m_end_valid))
+ return -1;
+
+ pts_t len_in_pts = m_pts_end - m_pts_begin;
+
+ /* wrap around? */
+ if (len_in_pts < 0)
+ len_in_pts += 0x200000000LL;
+ off_t len_in_bytes = m_offset_end - m_offset_begin;
+
+ if (!len_in_pts)
+ return -1;
+
+ unsigned long long bitrate = len_in_bytes * 90000 * 8 / len_in_pts;
+ if ((bitrate < 10000) || (bitrate > 100000000))
+ return -1;
+
+ return bitrate;
+}
+
+ /* pts, off */
+void eDVBTSTools::takeSamples()
+{
+ m_samples_taken = 1;
+ m_samples.clear();
+ pts_t dummy;
+ if (calcLen(dummy) == -1)
+ return;
+
+ 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;
+
+ 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;
+ }
+ }
+ m_samples[m_pts_begin] = m_offset_begin;
+ 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;
+}
git.cweiske.de / enigma2.git / blobdiff