Commit graph

70 commits

Author SHA1 Message Date
Edward Hervey
8ca1751f00 mpegtsdemux: Avoid parsing section without enough data
This is actually a workaround (we'll be skipping the upcoming section)

This will only happen for sections where the beginning is located within
the last 8 bytes of a packet (which is the minimum we need to properly
identify any section beginning).

Later we should figure out a way to store those bytes and mark that
some analysis needs to happen. The probability of this happening is
too low for me to care right now and do that fix. There is a good chance
that section will eventually be repeated and won't end up on such border.
2013-07-09 12:25:11 +02:00
Edward Hervey
61b30175b3 mpegtsdemux: Remove unneeded variables
* packet.origts is no longer used since the PCR refactoring done ages ago
* known_packet_size is a duplicate of packet_size != 0
* caps was never used outside of the packetizer
2013-07-09 12:25:11 +02:00
Edward Hervey
f58f13e874 mpegtsdemux: Fix multiple-SI detection/parsing
We had two issues with the previous code:
1) We were badly handling PUSI-flagged packets. We were discarding the
   initial data (if pointer != 0) whereas we should have been accumulating
   it with the previous data (if there was a continuity of course).
   => First series of information loss
2) We were not checking whether there were more sections after the end
   of one (i.e. when the following byte was not a stuff byte).

This fixes those two issues.

Fixes #677443

https://bugzilla.gnome.org/show_bug.cgi?id=677443
2013-07-07 08:29:37 +02:00
Edward Hervey
b7bba5658a mpegtsdemux: Fix compilation with debugging disabling
We previously weren't using that variable ...
2013-07-05 10:57:34 +02:00
Edward Hervey
1f2bb15618 mpegtsdemux: GstMpegTS => GstMpegTs 2013-07-03 14:00:58 +02:00
Edward Hervey
92edd82c86 mpegtsdemux: Switch to MPEG-TS SI library
* Only mpeg-ts section packetization remains.
* Improve code to detect duplicated sections as early as possible
* Add FIXME for various issues that need fixing (but are not regressions)

https://bugzilla.gnome.org/show_bug.cgi?id=702724
2013-07-03 09:17:25 +02:00
Edward Hervey
f9b3b46ab5 mpegtspacketizer: Speed up section parsing
Only create subtables when needed. It was previously creating one every
single time ... to check if one was present.
And speed up code to detect whether a subtable was already present or not.

Overall makes section pushing 2 times faster.
2013-06-24 07:49:34 +02:00
Edward Hervey
9fd7f1c082 mpegtspacketizer: Speedup packet parsing
Avoid using bitshifting where not needed.

Speeds up packet parsing by 3% (this is *the* hotspot of mpeg-ts elements).
2013-06-24 07:49:34 +02:00
Edward Hervey
0592bcc3c9 mpegtspacketizer: Better detect already seen section
In some cases (NIT on highly-populated DVB-C operator for example), there
will be more than one section emitted for the same subtable and version
number.

In order not to lose those updates for the same version number, we checked
against the CRC of the previous section we parsed.

The problem is that, while it made sure we didn't lose any information, it
also meant that if the same section came back (same version, same CRC) later
on we would re-process it, re-parse it and re-emit it.

This version improves on that by keeping a list of previously observed CRC
for identical PID/subtable/version-number and will only process sections if
they really were never seen in the past (as opposed to just before).

On a 30s clip, this brings down the number of NIT section parsing from 4541
down to 663.

https://bugzilla.gnome.org/show_bug.cgi?id=614479
2013-06-23 09:06:15 +02:00
Edward Hervey
c0ce94dbf2 mpegtspacketizer: Speed up NIT parsing
Avoid duplicating the delivery structure, and instead give it to the
receiving container.
2013-06-19 19:31:12 +02:00
Edward Hervey
79e63e3daf mpegtsdemux: Fix for compiling without GST_DEBUG
Protect debug-only variables/usage, and in one case remove a useless
variable.
2013-06-19 12:29:46 +02:00
Arnaud Vrac
a5402d6eeb tsdemux: fix M2TS stream resync
Sync byte scan is incorrect for M2TS streams because the timestamp 4
bytes were not included in the flush size. This can result in an
infinite loop.

Rework the scan code to be clearer and work in all cases.
2013-06-12 08:01:24 +02:00
Josep Torra
28a2902a7b tsdemux: fixes seeking in pull mode
Preserve the current segment and observations in pull mode seeks with
flushing.

https://bugzilla.gnome.org/show_bug.cgi?id=698050
2013-06-12 08:01:06 +02:00
Edward Hervey
0809770d26 mpegtspacketizer: Fix leak
Since we were manually setting GValue to the GValueArray, we also need
to specify how many were set, otherwise all values in the array will
be leaked.
2013-06-05 15:23:18 +02:00
Edward Hervey
877019ae00 mpegtspacketizer: Speedup TDT/TOT parsing
Use quarks where needed, makes it 2.5 times faster
2013-06-05 13:39:14 +02:00
Edward Hervey
824f08d1d8 mpegtspacketizer: Fix string leak
The description/text get copied in the structure.
2013-06-05 13:21:29 +02:00
Edward Hervey
f3bf40e2b0 mpegtspacketizer: Speed up descriptor parsing/packing
descriptors are stored as a GValueArray of GString. The downside is
that there is no way to "pass" ownership of a GValue to a GValueArray
which previously resulted in expensive copy/free of the (already expensive)
GString.

Here we estimate first the size of the GValueArray, then create it,
then directly use the GValue of that array.

Speeds up total SI parsing by ~30%
2013-06-05 12:49:09 +02:00
Edward Hervey
e6f0986b9e mpegtspacketizer: Use gst_value_list_append_and_take_value
Avoids doing the expensive copy of structures/arrays/...

Speeds up parsing SI by about 50%
2013-06-05 12:48:05 +02:00
Edward Hervey
b378b7e9d6 mpegtspacketizer: Avoid copying GValueArray
Just give the GValueArray to the container GValue.
2013-06-05 11:27:05 +02:00
David Schleef
303a2eaec4 mpegtsdemux: check value before using as denominator 2013-04-15 17:05:30 -07:00
Matthias Hardt
0e3fdb1e16 tsdemux: extract ISO 639 language codes for subtitles into taglists
https://bugzilla.gnome.org/show_bug.cgi?id=680200
2012-12-28 23:32:55 +00:00
Josep Torra
150376efe4 mpegtspacketizer: flush observations too
Flush the previous observations when the packetizer is flushed.
Also don't leak them in the dispose.
2012-11-12 22:57:19 +01:00
Josep Torra
996da425a9 Revert "tspacketizer: ensure that a null pointer isn't accessed"
This reverts commit 6efd611b8c.

Also this extra check won't be needed if it's fixed the race by moving
flush actions to FLUSH_STOP.
2012-11-10 19:52:46 +01:00
Josep Torra
6efd611b8c tspacketizer: ensure that a null pointer isn't accessed
Mitigates segfault due race condition in FLUSH_START handling and
mpegts_base_chain.
2012-11-09 22:17:11 +01:00
Edward Hervey
651203de07 mpegts: Only use timestamp-based PCR/PTS estimation when needed
When dealing with non-time based push-mode streams, we need to revert
to using the offset-based PCR/PTS estimation logic of packetizer.

This solves uses cases such as:
 pushfile:// ! tsdemux
 src ! queue ! tsdemux

https://bugzilla.gnome.org/show_bug.cgi?id=687178
2012-11-09 12:15:24 +01:00
Tim-Philipp Müller
9e1b75fda3 Fix FSF address
https://bugzilla.gnome.org/show_bug.cgi?id=687520
2012-11-04 00:09:59 +00:00
Sebastian Pölsterl
43938bbf54 tsdemux: Fix name of CAT GstStructure
The structure previously was assigned the name "pat".

https://bugzilla.gnome.org/show_bug.cgi?id=686948
2012-10-29 13:16:46 +01:00
Edward Hervey
105737db54 mpegtspacketizer: Fix flushing/sync handling
There was a stray adapter_flush() now that we used a temporary buffer
2012-08-14 19:07:58 +02:00
Edward Hervey
121aa3ad13 mpegtspacketizer: Better detect PCR resets
Assume that any differences in PCR greater than 15s means there is
a reset in the stream.
2012-08-14 19:07:51 +02:00
Edward Hervey
3153965658 mpegtspacketizer: Remove/demote some debugging 2012-08-14 19:07:39 +02:00
Edward Hervey
e25c2e8e74 mpegtspacketizer: Remove unneeded memset(0) 2012-08-14 19:07:28 +02:00
Edward Hervey
4d4d2f6eb0 mpegtspacketizer: Use gst_structure_*_take_value where applicable
Saves copying/freeing data
2012-08-14 19:06:16 +02:00
Edward Hervey
5de6fd1ff8 mpegtspacketizer: Cache the GIConv
Avoids having to constantly open/free them (which will end up being
very often with EIT/NIT).
2012-08-14 19:06:11 +02:00
Edward Hervey
b1295aef14 mpegtspacketizer: Use more Quarks 2012-08-14 19:05:58 +02:00
Edward Hervey
4f55cc12ae tsdemux: Calculate pcr/time/offset separately per program
Avoids quite a few issues with multi-program streams
2012-08-14 19:05:48 +02:00
Tony Houghton
a996d2f01a Correct satellite delivery descriptor parsing.
Original code to parse satellite delivery descriptors to generate
"satellite" structures appeared to be copy & pasted from cable's code
without amending for satellite.

Also added 8PSK to dvbsrc's enum for modulation.

https://bugzilla.gnome.org/show_bug.cgi?id=654485

Conflicts:

	gst/mpegdemux/gstmpegdesc.h
	gst/mpegdemux/mpegtspacketizer.c
2012-06-21 11:37:21 +01:00
Edward Hervey
a931620208 mpegtspacketizer: Don't use GByteArray
Using a simple array comes to the same result for a fraction of the cost
2012-06-19 10:49:45 +01:00
Edward Hervey
94c68115ef mpegdesc: Don't allocate/free GstMPEGDescriptor
Just use static variables
2012-06-19 10:49:26 +01:00
Edward Hervey
e2576f0e86 mpegtsdemux: Also parse TOT (Time Offset Section)
It's the same as TDT, except with descriptors at the end
2012-06-05 10:54:27 +02:00
Edward Hervey
d9121c38ea mpegtsdemux: FIXME/Comment about issues/errors 2012-06-05 10:54:26 +02:00
Edward Hervey
9e117b83fc mpegtspacketizer: Fix leak 2012-06-05 10:54:26 +02:00
Edward Hervey
5f7ecaa0f1 mpegtspacketizer: Reduce usage of GstAdapter
Peek as much as possible in one go. Ideally we should remove usage of
adapter altogether, but for the time being it provides a big enough
speedup (around 2 times faster per packet processed).
2012-06-05 10:54:26 +02:00
Edward Hervey
f0867c7247 mpegtspacketizer: Avoid alloc/free where possible
Helps for streams with a lot of sections, like EIT
2012-06-05 10:54:26 +02:00
Edward Hervey
0e86e68c6a mpegtspacketizer: Clarify debug statements
Use hex values in more cases (since that's how PID/table_id/... are
represented in the various specs).
2012-06-05 10:54:26 +02:00
Edward Hervey
63f8b970af mpegtsbase/packetizer: Add CAT section handling
Allows reporting the global EMM
2012-06-05 10:54:25 +02:00
Edward Hervey
c6035d403c mpegtspacketizer: Avoid usage of GstBuffer internally
The overhead of creating/using 188 byte GstBuffer from GstAdapter
is too expensive.
We now peek the next packet, and provide a data/size which is only
valid until the packetizerpacket is cleared.

In addition, cleanup all the internal code to deal with that new
behaviour and remove double-checks which are no longer needed.

The section_length is now the corrected section_length (i.e. with
the additional 3 bytes).

Avoid using gst_adapter_prev_timestamp and instead track
the timestamp ourself.
2012-05-22 17:43:38 +02:00
Edward Hervey
6d01f5f1b3 mpegtspacketizer: Detect PCR wraparound in skew code
If the received PCR is going backwards (by a safe margin), include
that wraparound for further calculation.

https://bugzilla.gnome.org/show_bug.cgi?id=674536
2012-05-22 16:51:25 +02:00
Edward Hervey
8a4fd8358d tsdemux: Detect and handle scrambled packets
Users (tsdemux/mpegtsparse) can decide what to do with that
2012-05-18 11:11:31 +02:00
Albert Astrals Cid
dda551e723 mpegts: support items in extended event descriptor
Fixes https://bugzilla.gnome.org/show_bug.cgi?id=672478
2012-05-14 11:51:15 +02:00
Wim Taymans
6bf0ebdcd8 mpegts: don't poke into private adapter fields 2012-05-01 09:41:18 +02:00