// Paragraph 9.3
static int ParseSegmentHeader(VP8BitReader* br,
VP8SegmentHeader* hdr, VP8Proba* proba) {
assert(br);
assert(hdr);
hdr.use_segment_ = VP8Get(br);
if (hdr.use_segment_) {
hdr.update_map_ = VP8Get(br);
if (VP8Get(br)) { // update data
int s;
hdr.absolute_delta_ = VP8Get(br);
for (s = 0; s < NUM_MB_SEGMENTS; ++s) {
hdr.quantizer_[s] = VP8Get(br) ? VP8GetSignedValue(br, 7) : 0;
}
for (s = 0; s < NUM_MB_SEGMENTS; ++s) {
hdr.filter_strength_[s] = VP8Get(br) ? VP8GetSignedValue(br, 6) : 0;
}
}
if (hdr.update_map_) {
int s;
for (s = 0; s < MB_FEATURE_TREE_PROBS; ++s) {
proba.segments_[s] = VP8Get(br) ? VP8GetValue(br, 8) : 255u;
}
}
} else {
hdr.update_map_ = 0;
}
return !br.eof_;
}
//------------------------------------------------------------------------------
// Header parsing
static void ResetSegmentHeader(VP8SegmentHeader* hdr) {
assert(hdr);
hdr.use_segment_ = 0;
hdr.update_map_ = 0;
hdr.absolute_delta_ = 1;
memset(hdr.quantizer_, 0, sizeof(hdr.quantizer_));
memset(hdr.filter_strength_, 0, sizeof(hdr.filter_strength_));
}