+#define _ISOC99_SOURCE /* for llabs */
#include <lib/dvb/tstools.h>
#include <lib/base/eerror.h>
#include <unistd.h>
eDVBTSTools::eDVBTSTools()
{
- m_fd = -1;
m_pid = -1;
m_maxrange = 256*1024;
m_begin_valid = 0;
m_end_valid = 0;
+
+ m_use_streaminfo = 0;
+ m_samples_taken = 0;
+
+ m_last_filelength = 0;
+
+ m_futile = 0;
}
eDVBTSTools::~eDVBTSTools()
closeFile();
}
-int eDVBTSTools::openFile(const char *filename)
+int eDVBTSTools::openFile(const char *filename, int nostreaminfo)
{
closeFile();
- m_fd = ::open(filename, O_RDONLY);
- if (m_fd < 0)
+
+ if (!nostreaminfo)
+ {
+ eDebug("loading streaminfo for %s", filename);
+ m_streaminfo.load(filename);
+ }
+
+ 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)
+ if (m_use_streaminfo)
+ if (!m_streaminfo.getPTS(offset, pts))
+ return 0;
+
+ 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)
+ {
+ eDebug("lseek failed");
return -1;
-
+ }
+
int left = m_maxrange;
while (left >= 188)
{
- unsigned char block[188];
- if (read(m_fd, block, 188) != 188)
+ unsigned char packet[188];
+ if (m_file.read(packet, 188) != 188)
+ {
+ eDebug("read error");
break;
+ }
left -= 188;
offset += 188;
- if (block[0] != 0x47)
+ if (packet[0] != 0x47)
{
+ eDebug("resync");
int i = 0;
while (i < 188)
{
- if (block[i] == 0x47)
+ if (packet[i] == 0x47)
break;
++i;
}
- offset = lseek(m_fd, i - 188, SEEK_CUR);
+ offset = m_file.lseek(i - 188, SEEK_CUR);
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;
- if (m_pid >= 0)
- if (pid != m_pid)
+ /* 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 at %llx: %16llx", offset, 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)
+ 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. */
- if (pes[0] || pes[1] || (pes[2] != 1))
+ if (payload[0] || payload[1] || (payload[2] != 1))
continue;
- if (pes[7] & 0x80) /* PTS */
+ /* 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 (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 pid %02x stream: %02x", pts, offset, pid, payload[3]);
+
+ /* convert to zero-based */
+ if (fixed && fixupPTS(offset, pts))
+ return -1;
return 0;
}
}
return -1;
}
+int eDVBTSTools::fixupPTS(const off_t &offset, pts_t &now)
+{
+ if (m_use_streaminfo)
+ {
+ if (!m_streaminfo.fixupPTS(offset, now))
+ return 0;
+ } 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, int marg)
+{
+ if (m_use_streaminfo)
+ {
+ if (pts >= m_pts_end && marg > 0 && m_end_valid)
+ offset = m_offset_end;
+ else
+ offset = m_streaminfo.getAccessPoint(pts, marg);
+ return 0;
+ } else
+ {
+ calcBegin(); calcEnd();
+
+ if (!m_begin_valid)
+ return -1;
+ if (!m_end_valid)
+ return -1;
+
+ if (!m_samples_taken)
+ takeSamples();
+
+ if (!m_samples.empty())
+ {
+ int maxtries = 5;
+ pts_t p = -1;
+
+ while (maxtries--)
+ {
+ /* 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;
+
+ /* 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;
+
+ if (offset_diff < 0)
+ {
+ eDebug("something went wrong when taking samples.");
+ m_samples.clear();
+ takeSamples();
+ continue;
+ }
+
+ 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;
+
+ if (!takeSample(offset, p))
+ {
+ int diff = (p - pts) / 90;
+
+ eDebug("calculated diff %d ms", diff);
+ if (abs(diff) > 300)
+ {
+ 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;
+ eDebug("aborting. Taking %llx as offset for %lld", offset, pts);
+ return 0;
+ }
+ }
+
+ int bitrate = calcBitrate();
+ offset = pts * (pts_t)bitrate / 8ULL / 90000ULL;
+ eDebug("fallback, bitrate=%d, results in %016llx", bitrate, offset);
+ 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)
+ if (!(m_begin_valid || m_futile))
{
m_offset_begin = 0;
if (!getPTS(m_offset_begin, m_pts_begin))
m_begin_valid = 1;
+ else
+ m_futile = 1;
}
}
void eDVBTSTools::calcEnd()
{
- if (m_fd < 0)
+ if (!m_file.valid())
return;
- m_offset_end = lseek(m_fd, 0, SEEK_END);
+ off_t end = m_file.lseek(0, SEEK_END);
+
+ if (llabs(end - m_last_filelength) > 1*1024*1024)
+ {
+ m_last_filelength = end;
+ m_end_valid = 0;
+
+ m_futile = 0;
+// eDebug("file size changed, recalc length");
+ }
int maxiter = 10;
- while (!m_end_valid)
+ m_offset_end = m_last_filelength;
+
+ while (!(m_end_valid || m_futile))
{
if (!--maxiter)
+ {
+ m_futile = 1;
return;
-
+ }
+
m_offset_end -= m_maxrange;
if (m_offset_end < 0)
m_offset_end = 0;
+
+ /* restore offset if getpts fails */
+ off_t off = m_offset_end;
+
if (!getPTS(m_offset_end, m_pts_end))
m_end_valid = 1;
+ else
+ m_offset_end = off;
+
if (!m_offset_end)
- return;
+ {
+ m_futile = 1;
+ break;
+ }
}
}
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;
}
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 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)
+ {
+ pts_t p;
+ takeSample(offset, p);
+ }
+ 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)
+{
+ if (!eDVBTSTools::getPTS(off, p, 1))
+ {
+ /* as we are happily mixing PTS and PCR values (no comment, please), we might
+ end up with some "negative" segments.
+
+ so check if this new sample is between the previous and the next field*/
+
+ std::map<pts_t, off_t>::const_iterator l = m_samples.lower_bound(p);
+ std::map<pts_t, off_t>::const_iterator u = l;
+
+ if (l != m_samples.begin())
+ {
+ --l;
+ if (u != m_samples.end())
+ {
+ if ((l->second > off) || (u->second < off))
+ {
+ eDebug("ignoring sample %llx %llx %llx (%lld %lld %lld)",
+ l->second, off, u->second, l->first, p, u->first);
+ return 1;
+ }
+ }
+ }
+
+
+ m_samples[p] = off;
+ return 0;
+ }
+ return 1;
+}
+
+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 packet[188];
+ if (m_file.read(packet, 188) != 188)
+ {
+ eDebug("read error");
+ break;
+ }
+ left -= 188;
+
+ if (packet[0] != 0x47)
+ {
+ int i = 0;
+ while (i < 188)
+ {
+ if (packet[i] == 0x47)
+ break;
+ ++i;
+ }
+ m_file.lseek(i - 188, SEEK_CUR);
+ continue;
+ }
+
+ int pid = ((packet[1] << 8) | packet[2]) & 0x1FFF;
+
+ int pusi = !!(packet[1] & 0x40);
+
+ if (!pusi)
+ continue;
+
+ /* ok, now we have a PES header or section header*/
+ unsigned char *sec;
+
+ /* check for adaption field */
+ 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[1] == 0x02) /* program map section */
+ {
+ pmt_pid = pid;
+ service_id = (sec[4] << 8) | sec[5];
+ return 0;
+ }
+ }
+
+ return -1;
+}
+
+int eDVBTSTools::findFrame(off_t &_offset, size_t &len, int &direction, int frame_types)
+{
+ off_t offset = _offset;
+ int nr_frames = 0;
+// eDebug("trying to find iFrame at %llx", offset);
+
+ if (!m_use_streaminfo)
+ {
+// eDebug("can't get next iframe without streaminfo");
+ return -1;
+ }
+
+ /* let's find the iframe before the given offset */
+ unsigned long long data;
+
+ if (direction < 0)
+ offset--;
+
+ while (1)
+ {
+ if (m_streaminfo.getStructureEntry(offset, data, (direction == 0) ? 1 : 0))
+ {
+ eDebug("getting structure info for origin offset failed.");
+ return -1;
+ }
+ if (offset == 0x7fffffffffffffffLL) /* eof */
+ {
+ eDebug("reached eof");
+ return -1;
+ }
+ /* data is usually the start code in the lower 8 bit, and the next byte <<8. we extract the picture type from there */
+ /* we know that we aren't recording startcode 0x09 for mpeg2, so this is safe */
+ /* TODO: check frame_types */
+ int is_start = (data & 0xE0FF) == 0x0009; /* H.264 NAL unit access delimiter with I-frame*/
+ is_start |= (data & 0x3800FF) == 0x080000; /* MPEG2 picture start code with I-frame */
+
+ int is_frame = ((data & 0xFF) == 0x0009) || ((data & 0xFF) == 0x00); /* H.264 UAD or MPEG2 start code */
+
+ if (is_frame)
+ {
+ if (direction < 0)
+ --nr_frames;
+ else
+ ++nr_frames;
+ }
+// eDebug("%08llx@%llx -> %d, %d", data, offset, is_start, nr_frames);
+ if (is_start)
+ break;
+
+ if (direction == -1)
+ --offset; /* move to previous entry */
+ else if (direction == +1)
+ direction = 0;
+ }
+ /* let's find the next frame after the given offset */
+ off_t start = offset;
+
+ do {
+ if (m_streaminfo.getStructureEntry(offset, data, 1))
+ {
+ eDebug("get next failed");
+ return -1;
+ }
+ if (offset == 0x7fffffffffffffffLL) /* eof */
+ {
+ eDebug("reached eof (while looking for end of iframe)");
+ return -1;
+ }
+// eDebug("%08llx@%llx (next)", data, offset);
+ } while (((data & 0xFF) != 9) && ((data & 0xFF) != 0x00)); /* next frame */
+
+ /* align to TS pkt start */
+// start = start - (start % 188);
+// offset = offset - (offset % 188);
+
+ len = offset - start;
+ _offset = start;
+ direction = nr_frames;
+// eDebug("result: offset=%llx, len: %ld", offset, (int)len);
+ return 0;
+}
+
+int eDVBTSTools::findNextPicture(off_t &offset, size_t &len, int &distance, int frame_types)
+{
+ int nr_frames, direction;
+// eDebug("trying to move %d frames at %llx", distance, offset);
+
+ frame_types = frametypeI; /* TODO: intelligent "allow IP frames when not crossing an I-Frame */
+
+ off_t new_offset = offset;
+ size_t new_len = len;
+ int first = 1;
+
+ if (distance > 0) {
+ direction = 0;
+ nr_frames = 0;
+ } else {
+ direction = -1;
+ nr_frames = -1;
+ distance = -distance+1;
+ }
+ while (distance > 0)
+ {
+ int dir = direction;
+ if (findFrame(new_offset, new_len, dir, frame_types))
+ {
+// eDebug("findFrame failed!\n");
+ return -1;
+ }
+
+ distance -= abs(dir);
+
+// eDebug("we moved %d, %d to go frames (now at %llx)", dir, distance, new_offset);
+
+ if (distance >= 0 || direction == 0)
+ {
+ first = 0;
+ offset = new_offset;
+ len = new_len;
+ nr_frames += abs(dir);
+ }
+ else if (first) {
+ first = 0;
+ offset = new_offset;
+ len = new_len;
+ nr_frames += abs(dir) + distance; // never jump forward during rewind
+ }
+ }
+
+ distance = (direction < 0) ? -nr_frames : nr_frames;
+// eDebug("in total, we moved %d frames", nr_frames);
+
+ return 0;
+}
projects / vuplus_dvbapp / blobdiff