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FastMBAnalyze() for quick i16/i4 decision

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The decision is based on the variance between DC values of each
sub-4x4 block. This heuristic is rather ok for predicting whether
the 2nd transform (intra-16) is going to help or not.
The decision threshold varies with quality (=quantization).

It's only used for -m 0 and -m 1, where no full RD-opt is performed.
It actually makes these modes quite faster, with RD curve much
closer to the -m 2 mode.

Change-Id: I15f972db97ba4082cbd1dfd16bee3eb2eca701a8
This commit is contained in:
skal
2016-07-15 11:21:08 -07:00
parent 567e697776
commit 5b60db5c9d
5 changed files with 89 additions and 9 deletions
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32
src/dsp/enc_sse2.c
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@ -1045,6 +1045,37 @@ static int SSE4x4(const uint8_t* a, const uint8_t* b) {
return (tmp[3] + tmp[2] + tmp[1] + tmp[0]);
}
//------------------------------------------------------------------------------
static void Mean16x4(const uint8_t* ref, uint32_t dc[4]) {
const __m128i mask = _mm_set1_epi16(0x00ff);
const __m128i a0 = _mm_loadu_si128((const __m128i*)&ref[BPS * 0]);
const __m128i a1 = _mm_loadu_si128((const __m128i*)&ref[BPS * 1]);
const __m128i a2 = _mm_loadu_si128((const __m128i*)&ref[BPS * 2]);
const __m128i a3 = _mm_loadu_si128((const __m128i*)&ref[BPS * 3]);
const __m128i b0 = _mm_srli_epi16(a0, 8); // hi byte
const __m128i b1 = _mm_srli_epi16(a1, 8);
const __m128i b2 = _mm_srli_epi16(a2, 8);
const __m128i b3 = _mm_srli_epi16(a3, 8);
const __m128i c0 = _mm_and_si128(a0, mask); // lo byte
const __m128i c1 = _mm_and_si128(a1, mask);
const __m128i c2 = _mm_and_si128(a2, mask);
const __m128i c3 = _mm_and_si128(a3, mask);
const __m128i d0 = _mm_add_epi32(b0, c0);
const __m128i d1 = _mm_add_epi32(b1, c1);
const __m128i d2 = _mm_add_epi32(b2, c2);
const __m128i d3 = _mm_add_epi32(b3, c3);
const __m128i e0 = _mm_add_epi32(d0, d1);
const __m128i e1 = _mm_add_epi32(d2, d3);
const __m128i f0 = _mm_add_epi32(e0, e1);
uint16_t tmp[8];
_mm_storeu_si128((__m128i*)tmp, f0);
dc[0] = tmp[0] + tmp[1];
dc[1] = tmp[2] + tmp[3];
dc[2] = tmp[4] + tmp[5];
dc[3] = tmp[6] + tmp[7];
}
//------------------------------------------------------------------------------
// Texture distortion
//
@ -1331,6 +1362,7 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspInitSSE2(void) {
VP8SSE4x4 = SSE4x4;
VP8TDisto4x4 = Disto4x4;
VP8TDisto16x16 = Disto16x16;
VP8Mean16x4 = Mean16x4;
}
#else // !WEBP_USE_SSE2