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simplify the Histogram struct, to only store max_value and last_nz

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we don't need to store the whole distribution in order to compute the alpha

Later, we can incorporate the max_value / last_non_zero bookkeeping
in SSE2 directly.

Change-Id: I748ccea4ac17965d7afcab91845ef01be3aa3e15
This commit is contained in:
Pascal Massimino
2014-12-10 10:44:57 +01:00
parent 37e395fd1c
commit bad775715a
6 changed files with 59 additions and 33 deletions
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4
src/dsp/enc_neon.c
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@ -727,6 +727,7 @@ static void CollectHistogram(const uint8_t* ref, const uint8_t* pred,
VP8Histogram* const histo) {
const uint16x8_t max_coeff_thresh = vdupq_n_u16(MAX_COEFF_THRESH);
int j;
int distribution[MAX_COEFF_THRESH + 1] = { 0 };
for (j = start_block; j < end_block; ++j) {
int16_t out[16];
FTransform(ref + VP8DspScan[j], pred + VP8DspScan[j], out);
@ -744,10 +745,11 @@ static void CollectHistogram(const uint8_t* ref, const uint8_t* pred,
vst1q_s16(out + 8, vreinterpretq_s16_u16(b3));
// Convert coefficients to bin.
for (k = 0; k < 16; ++k) {
histo->distribution[out[k]]++;
++distribution[out[k]];
}
}
}
VP8LSetHistogramData(distribution, histo);
}
//------------------------------------------------------------------------------