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Check the requirement on is_first_tile_group (#5143) #5171

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Check the requirement on is_first_tile_group (#5143) #5171

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8 changes: 8 additions & 0 deletions av2/decoder/decodeframe.c
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Original file line number Diff line number Diff line change
Expand Up @@ -9610,6 +9610,14 @@ int32_t av2_read_tilegroup_header(
send_first_tile_group_indication &= obu_type != OBU_BRIDGE_FRAME;
if (send_first_tile_group_indication)
is_first_tile_group = avm_rb_read_bit(rb);
// It is a requirement of bitstream conformance that SeenFrameHeader is not
// equal to is_first_tile_group.
if (pbi->seen_frame_header == is_first_tile_group) {
avm_internal_error(
&cm->error, AVM_CODEC_CORRUPT_FRAME,
"SeenFrameHeader (%d) is equal to is_first_tile_group (%d)",
pbi->seen_frame_header, is_first_tile_group);
}
*first_tile_group_in_frame = is_first_tile_group;

if (is_first_tile_group) {
Expand Down