From 4a7a8362a83b1a6c2bd0abf13cd7b19359e9768a Mon Sep 17 00:00:00 2001 From: Felix Domke Date: Thu, 29 Oct 2009 01:47:49 +0100 Subject: [PATCH] By Anders Holst: * My previous code for "slow rewind" (aka "SeekBackHack") is not required any more. Indeed, since the change in "decoder states" some time ago my code stopped working and is now only destructively interfering with the new winding approach, effectively ruining the speed accuracy for slow rewind. Similarly, the "non-smooth winding" code ruins the accuracy for high winding speeds. The patch below removes the "SeekBackHack", and temporarily disables the "non-smooth winding" code until we know whether the decoder states will allow simultaneous repeat and skip rates again. (InfoBarGenerics.py) * Due to a bug in 'eDVBTSTools::findNextPicture', rewind was always at the required speed minus one. (The frame just played was counted as one when skipping backwards.) Fixed below. (tstools.cpp) * A piece of code to apparently increase precision in seeking, by always aligning to an i-frame start, had exactly the opposite effect: GOP single-stepping fails completely on DM7025 and gets highly unreliable on DM800. The piece of code is removed. (It destructively interferes with previous code by me to hit frames somewhat before the GOP start. As an alternative, my previous code can be removed instead, and the currently removed piece of code adjusted to work. But then it has to be done differently on the two platforms.) (dvb.cpp) * By some reason eDVBVideo::getPTS only returns even numbers on DM800 even when it should be odd. This ruins GOP single stepping in 50% of the cases. This is easy to compensate for by adding a margin of 1 in getAccessPoint. (pvrparse.cpp) * After the above, when GOP single-stepping works reliable on both platforms and on SD/HD, the correct step lengths can be used. (InfoBarGenerics.py) --- lib/dvb/dvb.cpp | 7 +----- lib/dvb/pvrparse.cpp | 1 + lib/dvb/tstools.cpp | 21 +++++++++++++----- lib/python/Screens/InfoBarGenerics.py | 31 +++++++++++---------------- 4 files changed, 30 insertions(+), 30 deletions(-) diff --git a/lib/dvb/dvb.cpp b/lib/dvb/dvb.cpp index 894287e8..a8dfb193 100644 --- a/lib/dvb/dvb.cpp +++ b/lib/dvb/dvb.cpp @@ -1462,12 +1462,7 @@ void eDVBChannel::getNextSourceSpan(off_t current_offset, size_t bytes_read, off continue; } - size_t iframe_len; - /* try to align to iframe */ - int direction = pts < 0 ? -1 : 1; - m_tstools.findFrame(offset, iframe_len, direction); - - eDebug("ok, resolved skip (rel: %d, diff %lld), now at %08llx (skipped additional %d frames due to iframe re-align)", relative, pts, offset, direction); + eDebug("ok, resolved skip (rel: %d, diff %lld), now at %08llx", relative, pts, offset); current_offset = align(offset, blocksize); /* in case tstools return non-aligned offset */ } diff --git a/lib/dvb/pvrparse.cpp b/lib/dvb/pvrparse.cpp index 1393bf77..5cdecbd6 100644 --- a/lib/dvb/pvrparse.cpp +++ b/lib/dvb/pvrparse.cpp @@ -244,6 +244,7 @@ off_t eMPEGStreamInformation::getAccessPoint(pts_t ts, int marg) off_t last = 0; off_t last2 = 0; pts_t lastc = 0; + ts += 1; // Add rounding error margin for (std::map::const_iterator i(m_access_points.begin()); i != m_access_points.end(); ++i) { pts_t delta = getDelta(i->first); diff --git a/lib/dvb/tstools.cpp b/lib/dvb/tstools.cpp index a9eef406..2e5c5665 100644 --- a/lib/dvb/tstools.cpp +++ b/lib/dvb/tstools.cpp @@ -652,18 +652,23 @@ int eDVBTSTools::findFrame(off_t &_offset, size_t &len, int &direction, int fram int eDVBTSTools::findNextPicture(off_t &offset, size_t &len, int &distance, int frame_types) { - int nr_frames = 0; + 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 */ - int direction = distance > 0 ? 0 : -1; - distance = abs(distance); - 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; @@ -677,12 +682,18 @@ int eDVBTSTools::findNextPicture(off_t &offset, size_t &len, int &distance, int // eDebug("we moved %d, %d to go frames (now at %llx)", dir, distance, new_offset); - if (distance >= 0 || first) + 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 } } diff --git a/lib/python/Screens/InfoBarGenerics.py b/lib/python/Screens/InfoBarGenerics.py index 2f830616..5336f9a0 100644 --- a/lib/python/Screens/InfoBarGenerics.py +++ b/lib/python/Screens/InfoBarGenerics.py @@ -692,8 +692,6 @@ class InfoBarSeek: iPlayableService.evSOF: self.__evSOF, }) - self.minSpeedBackward = useSeekBackHack and 16 or 0 - class InfoBarSeekActionMap(HelpableActionMap): def __init__(self, screen, *args, **kwargs): HelpableActionMap.__init__(self, screen, *args, **kwargs) @@ -740,24 +738,19 @@ class InfoBarSeek: self.__seekableStatusChanged() def makeStateForward(self, n): - minspeed = config.seek.stepwise_minspeed.value - repeat = int(config.seek.stepwise_repeat.value) - if minspeed != "Never" and n >= int(minspeed) and repeat > 1: - return (0, n * repeat, repeat, ">> %dx" % n) - else: +# minspeed = config.seek.stepwise_minspeed.value +# repeat = int(config.seek.stepwise_repeat.value) +# if minspeed != "Never" and n >= int(minspeed) and repeat > 1: +# return (0, n * repeat, repeat, ">> %dx" % n) +# else: return (0, n, 0, ">> %dx" % n) def makeStateBackward(self, n): - minspeed = config.seek.stepwise_minspeed.value - repeat = int(config.seek.stepwise_repeat.value) - if self.minSpeedBackward and n < self.minSpeedBackward: - r = (self.minSpeedBackward - 1)/ n + 1 - if minspeed != "Never" and n >= int(minspeed) and repeat > 1: - r = max(r, repeat) - return (0, -n * r, r, "<< %dx" % n) - elif minspeed != "Never" and n >= int(minspeed) and repeat > 1: - return (0, -n * repeat, repeat, "<< %dx" % n) - else: +# minspeed = config.seek.stepwise_minspeed.value +# repeat = int(config.seek.stepwise_repeat.value) +# if minspeed != "Never" and n >= int(minspeed) and repeat > 1: +# return (0, -n * repeat, repeat, "<< %dx" % n) +# else: return (0, -n, 0, "<< %dx" % n) def makeStateSlowMotion(self, n): @@ -877,7 +870,7 @@ class InfoBarSeek: if config.seek.on_pause.value == "play": self.unPauseService() elif config.seek.on_pause.value == "step": - self.doSeekRelative(0) + self.doSeekRelative(1) elif config.seek.on_pause.value == "last": self.setSeekState(self.lastseekstate) self.lastseekstate = self.SEEK_STATE_PLAY @@ -950,7 +943,7 @@ class InfoBarSeek: self.setSeekState(self.makeStateBackward(int(config.seek.enter_backward.value))) self.doSeekRelative(-6) elif seekstate == self.SEEK_STATE_PAUSE: - self.doSeekRelative(-3) + self.doSeekRelative(-1) elif self.isStateForward(seekstate): speed = seekstate[1] if seekstate[2]: -- 2.30.2