tree 267b513692b3ac1e6bfffabe42f6af76e2b148c7
parent 0f418914126ca884852cb5d7c9b87e677dc59807
author Vignesh Venkatasubramanian <vigneshv@google.com> 1645135817 -0800
committer Wan-Teh Chang <wtc@google.com> 1645141878 -0800

Write ccst box in Sample Entry for animated images

Section 7.2.3 of the HEIF spec:
The CodingConstraintsBox shall be present in the sample description
entry for tracks with handler_type equal to 'pict'.

The values of the fields are chosen to be permissive rather than
figuring out the exact values by inspecting the bitstream which can be
too cumbersome. The values are as follows:
all_ref_pics_intra - 0 - all samples can use any type of reference.
intra_pred_used - 1 - intra prediction may or may not be used.
max_ref_per_pic - 15 - reserved value to indicate that any number of
                       reference images can be used.

Fixes the following Compliance Warden error:
[heif][Rule #12] Error: CodingConstraintsBox ('ccst') shall be present
once