Commit graph

19 commits

Author SHA1 Message Date
Matthew Waters
a26b363d3e closedcaption: produce valid cea608 padding by default
Cea608 (valid) padding removal is available on the input side of ccconverter
or configurable on cccombiner.  cccombiner can now configure whether
valid or invalid cea608 padding is used and for valid padding, how long
after valid non-padding to keep sending valid padding.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6300>
2024-03-12 02:49:01 +00:00
Seungha Yang
d2d2ac43e8 ccconverter: Send gap event if generated output is empty
Sends a gap event if nothing to output for a given input buffer.
For example, an input buffer might not contain any caption data
for downstream requested field, then we need to inform downstream
of the case.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6073>
2024-02-09 11:03:21 +00:00
Vivia Nikolaidou
dd00dab5e9 ccutils: Add padding also for ccp data
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5423>
2023-11-08 10:06:45 +00:00
Matthew Waters
21b232ce30 closedcaption: write 0x00 padding instead of 0x80 in cc_data/cdp
Depending on the exact output format, 0x00 may be a better default for
padding than 0x80.  0x00 is the recommended padding value when used in
CDP (and cc_data) but is not when used in s334-1a.  See CTA-708-E 4.3.5
amd SMPTE 334-1-2007 5.3.2.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4578>
2023-05-10 00:52:01 +00:00
Matthew Waters
b132a44ba5 ccconverter: reintroduce frame count reset on cycle completion
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4308>
2023-03-31 21:35:21 +00:00
Mathieu Duponchelle
2eab37f231 ccconverter: implement field conversion of CEA 608 control codes
As specified in EIA/CEA-608-B section 8.4:

When closed captioning is used on line 21, field 2, it shall conform
to all of the applicable specifications and recommended practices as
defined for field 1 services with the following differences:

a) The non-printing character of the miscellaneous control-character pairs
  that fall in the range of 14h, 20h to 14h, 2Fh in field 1, shall be replaced
  with 15h, 20h to 15h, 2Fh when used in field 2.
b) The non-printing character of the miscellaneous control-character pairs
  that fall in the range of 1Ch, 20h to 1Ch, 2Fh in field 1, shall be replaced
  with 1Dh, 20h to 1Dh, 2Fh when used in field 2.

This means simply switching the "field" field in the caps isn't enough for
converting raw 608 from one field to another, some control codes also
need to be amended.

+ Adds simple test

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4126>
2023-03-08 10:13:59 +00:00
Mathieu Duponchelle
9e8d1dccb4 ccconverter: add support for advertising / selecting field
Raw 608 caps can now contain a "field" field. On the input side it
signifies that the input raw 608 is attached to either field 0 or 1,
on the output side it allows selecting whether to extract the raw 608
data for field 0 or 1 for field-aware formats.

In addition, it is also allowed to use ccconverter to "convert" 608
field 0 to 608 field 1 (and conversely), this is passthrough as the
change only needs to happen in the caps.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4031>
2023-02-24 19:11:56 +00:00
Matthew Waters
921c93a9af ccconverter: don't debug a potentially freed filter caps
Fixes a use-after-free

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4011>
2023-02-21 15:20:41 +11:00
Matthew Waters
088597b430 closedcaption: move CC buffering to helper object
Move most of the interesting code from ccconverter to this new helper
object.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3211>
2022-11-10 00:52:14 +00:00
Matthew Waters
06a20f9243 closedcaption: move cdp->cc_data into shared location
So it can be used by both ccconverter and cccombiner

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3211>
2022-11-10 00:52:14 +00:00
Matthew Waters
fde92ec43f closedcaption: move cc_data->cdp to shared file
Used by both ccconverter and cccombiner

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3211>
2022-11-10 00:52:14 +00:00
Matthew Waters
9f1b54f6ee ccconverter: avoid different indent versions indenting !! differently.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3211>
2022-11-10 00:52:14 +00:00
Matthew Waters
067185e7da closedcaption: move cdp framerate table to common file
shared by both cccombiner and ccconverter

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3211>
2022-11-10 00:52:14 +00:00
Matthew Waters
741cfd18b5 ccconverter: drop data when overflow on extracting cea608 from cc_data
If the buffer overflows, then drop rather than causing a failure and
fropping the output buffer indefinitely.  This may have caused downstream to
be waiting for data the will never arrive.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3211>
2022-11-10 00:52:14 +00:00
Matthew Waters
542060fea7 ccconverter: fix framerate passthrough with malformed input
If an input is malformed (only produces cea608 field 1 cc_data) then
when in passthrough we would effectively be dropping every second cea608
on output as we would not store any unused cea608 data.

Fix by having all code paths go through the framerate conversion code
which will store and retrieve any relevant data across buffers.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3211>
2022-11-10 00:52:14 +00:00
Matthew Waters
2e69886a02 ccconverter: ensure correct ordering of cea608 across output buffers
e.g. if a 60fps output is configured, we can only produce a single field
of cea608 that must alternate between field 1 and field 2.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2019>
2022-03-26 00:00:36 +00:00
Matthew Waters
6977119f99 ccconverter: ignore padding cea608 data even if marked as 'valid'
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2019>
2022-03-26 00:00:36 +00:00
Matthew Waters
098ff9a453 ccconverter: drop data with a warning if scratch buffers overflow
Instead of asserting which could bring down the entire application.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1972>
2022-03-17 21:46:44 +11:00
Thibault Saunier
019971a3c7 Move files from gst-plugins-bad into the "subprojects/gst-plugins-bad/" subdir 2021-09-24 16:14:36 -03:00
Renamed from ext/closedcaption/gstccconverter.c (Browse further)