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Add an early stop condition to motion estimation.

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This commit is contained in:
Ari Koivula 2013-09-25 17:59:15 +03:00
parent 2c894b49bf
commit 4cda086035
1 changed files with 11 additions and 0 deletions
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11
src/search.c
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@ -55,6 +55,17 @@ void search_mv(picture *pic, uint8_t *pic_data, uint8_t *ref_data,
}
while (step > 0) {
// Stop if current best vector is already really good.
// This is an experimental condition.
// The constant 1.8 is there because there is some SAD cost when comparing
// against the reference even if the frame doesn't change. This is probably
// due to quantization. It's value is just a guess based on the first
// blocks of the BQMall sequence, which don't move.
// TODO: Quantization factor probably affects what the constant should be.
if (best_cost <= block_width * block_width * 1.8) {
break;
}
// above
cost = get_sad(orig_x + x, orig_y + y - step, pic->width, pic->height, block_width, pic_data, ref_data);
if (cost > 0 && cost < best_cost) {