Commit graph

13 commits

Author SHA1 Message Date
Matthew Waters
8fd2c68968 ccconverter: fix framerate caps negotiation from non-cdp to cdp
We can only convert from non-cdp to cdp within the confines of valid cdp
framerates.  The existing caps negotiation code was allowing any
framerate to convert to a cdp output which is incorrect and would hit an
assertion later.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2372>
2021-07-02 10:22:31 +03:00
Matthew Waters
ebd1b2c929 ccconverter: write the cdp timecode data correctly
We were mixing up the tens part with the unit parts all over the place.

e.g. 12 seconds would be encoded as 0x21 instead of the correct 0x12

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1400>
2020-07-03 06:54:46 +00:00
Matthew Waters
c6c4d42c4a ccconverter: fail negotiation when framerate conversion is not possible
Converting between anything but cdp will fail at converting
framerates and negotiation should reflect that.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1393>
2020-07-01 19:33:56 +00:00
Matthew Waters
4f334234c8 ccconverter: fix missing output framerate on the caps
A pipeline like this:

closedcaption/x-cea-708,format=cdp,framerate=30000/1001 ! ccconverter ! closedcaption/x-cea-708,format=cc_data

would produce a critical/assert:

GStreamer-CRITICAL **: 14:21:11.509: gst_util_fraction_multiply: assertion 'a_d != 0' failed

because there would be no framerate field on ccconverter's output.

Fixed by always fixating a framerate if the input has a framerate.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1393>
2020-07-01 19:33:56 +00:00
Matthew Waters
ba1558a7ab ccconverter: use a better padding byte sequence for writing cdp
0xf8 can be interpreted as cea608 data at the beginning of a cdp packet
as the cc_valid bit is not checked when cc_valid in (0b00 or 0b01).

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1116>
2020-05-11 12:30:31 +00:00
Matthew Waters
7ed0bc539f ccconverter: split temporary storage into 3
Instead of storing the raw cc_data, store the 2 cea608 fields individually
as well as the ccp data.

Simply copying the input cc_data to the output cc_data violates a number of
requirements in the cea708 specification.  The most prominent being, that
cea608 triples must be placed at the beginning of each cdp.

We also need to comply with the framerate-dpendent limits for both the
cea608 and the ccp data which may involve splitting or merging some
cea608 data but not ccp data or vice versa.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1116>
2020-05-11 12:30:31 +00:00
Matthew Waters
3417a1709c ccconvert: compact input cc_data where possible
Skip over padding cc_data triples.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1116>
2020-05-11 12:30:31 +00:00
Matthew Waters
7d028af675 ccconverter: implement support for CDP framerate conversions
- Any format involving CDP is supported.
- Time codes (if present) are scaled as well.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1116>
2020-05-11 12:30:31 +00:00
Matthew Waters
ddc7563ac9 tests/ccconverter: test the time codes are successfully passed through
Where time codes are not stored in the caption data themselves

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1116>
2020-05-11 12:30:31 +00:00
Matthew Waters
31a0bf367d ccconverter: cc_count limits are per framerate
Enforce this and add a test for cdp input being too large.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1116>
2020-05-11 12:30:31 +00:00
Sebastian Dröge
0478e2dc1a ccconverter: Fill remainder of the cc_data in CDP packets with empty packets
Instead of filling it completely with zeroes. Filling with zeroes is
considered invalid by various CC implementations.
2020-01-24 09:26:28 +00:00
Sebastian Dröge
f6b4e24f72 ccconverter: Instead of erroring out on too big input drop additional data 2019-11-04 13:43:25 +00:00
Sebastian Dröge
fcceb37bf2 ccconverter: Add unit test 2018-12-19 00:20:26 +02:00