As defined in sections F.14.2.8 and F.14.3.8
Reviewed-by: Mark Thompson <sw@jkqxz.net>
Signed-off-by: James Almer <jamrial@gmail.com>

This follows the spec definition, and removes a field from the relevant
structs.
Reviewed-by: Mark Thompson <sw@jkqxz.net>
Signed-off-by: James Almer <jamrial@gmail.com>

The spec defines it as an array of signed values, inferred to 0 when not
present.
Reviewed-by: Mark Thompson <sw@jkqxz.net>
Signed-off-by: James Almer <jamrial@gmail.com>

Supports both prefix and suffix SEI, decoding all of the common SEI
types and some more obscure ones.  Most of this is tested by the
existing tests in fate.

With fate test using the SLPPLP_A_VIDYO_2 conformance file, which contains
two sublayers with full PTL information.

Signed-off-by: Haihao Xiang <haihao.xiang@intel.com>

Similar to H264, cbs_h265_{read, write}_nal_unit() can handle HEVC
prefix SEI NAL units. Currently mastering display colour volume SEI
message is added only, we may add more SEI message if needed later
Signed-off-by: Haihao Xiang <haihao.xiang@intel.com>

Removes unnecessary data copies, and partially fixes potential issues
with dangling references held in said lists.
Reviewed-by: Mark Thompson <sw@jkqxz.net>
Signed-off-by: James Almer <jamrial@gmail.com>

This makes it easier for users of the CBS API to get alloc/free right -
all subelements use the buffer API so that it's clear how to free them.
It also allows eliding some redundant copies: the packet -> fragment copy
disappears after this change if the input packet is refcounted, and more
codec-specific cases are now possible (but not included in this patch).

(cherry picked from commit 867381b8)
(cherry picked from commit f7634893)
(cherry picked from commit 067a9dde)