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Merge "Add two-pass quantization"

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Yunqing Wang 2013-06-19 11:35:40 -07:00 committed by Gerrit Code Review
commit 3656835771
1 changed files with 182 additions and 13 deletions
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195
vp9/encoder/vp9_quantize.c
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@ -26,6 +26,153 @@ static INLINE int plane_idx(int plane) {
plane == 1 ? 16 : 20;
}
static void quantize(int16_t *zbin_boost_orig_ptr,
int16_t *coeff_ptr, int n_coeffs, int skip_block,
int16_t *zbin_ptr, int16_t *round_ptr, int16_t *quant_ptr,
uint8_t *quant_shift_ptr,
int16_t *qcoeff_ptr, int16_t *dqcoeff_ptr,
int16_t *dequant_ptr, int zbin_oq_value,
uint16_t *eob_ptr,
const int *scan, int mul) {
int i, rc, eob;
int zbins[2], nzbins[2], zbin;
int x, y, z, sz;
int zero_run = 0;
int16_t *zbin_boost_ptr = zbin_boost_orig_ptr;
int zero_flag = n_coeffs;
vpx_memset(qcoeff_ptr, 0, n_coeffs*sizeof(int16_t));
vpx_memset(dqcoeff_ptr, 0, n_coeffs*sizeof(int16_t));
eob = -1;
// Base ZBIN
zbins[0] = zbin_ptr[0] + zbin_oq_value;
zbins[1] = zbin_ptr[1] + zbin_oq_value;
nzbins[0] = zbins[0] * -1;
nzbins[1] = zbins[1] * -1;
if (!skip_block) {
// Pre-scan pass
for (i = n_coeffs - 1; i >= 0; i--) {
rc = scan[i];
z = coeff_ptr[rc] * mul;
if (z < zbins[rc != 0] && z > nzbins[rc != 0]) {
zero_flag--;
} else {
break;
}
}
// Quantization pass: All coefficients with index >= zero_flag are
// skippable. Note: zero_flag can be zero.
for (i = 0; i < zero_flag; i++) {
rc = scan[i];
z = coeff_ptr[rc] * mul;
zbin = (zbins[rc != 0] + zbin_boost_ptr[zero_run]);
zero_run += (zero_run < 15);
sz = (z >> 31); // sign of z
x = (z ^ sz) - sz;
if (x >= zbin) {
x += (round_ptr[rc != 0]);
y = ((int)(((int)(x * quant_ptr[rc != 0]) >> 16) + x))
>> quant_shift_ptr[rc != 0]; // quantize (x)
x = (y ^ sz) - sz; // get the sign back
qcoeff_ptr[rc] = x; // write to destination
dqcoeff_ptr[rc] = x * dequant_ptr[rc != 0] / mul; // dequantized value
if (y) {
eob = i; // last nonzero coeffs
zero_run = 0; // set zero_run
}
}
}
}
*eob_ptr = eob + 1;
}
// This function works well for large transform size.
static void quantize_sparse(int16_t *zbin_boost_orig_ptr,
int16_t *coeff_ptr, int n_coeffs, int skip_block,
int16_t *zbin_ptr, int16_t *round_ptr,
int16_t *quant_ptr, uint8_t *quant_shift_ptr,
int16_t *qcoeff_ptr, int16_t *dqcoeff_ptr,
int16_t *dequant_ptr, int zbin_oq_value,
uint16_t *eob_ptr, const int *scan, int mul,
int *idx_arr) {
int i, rc, eob;
int zbins[2], pzbins[2], nzbins[2], zbin;
int x, y, z, sz;
int zero_run = 0;
int16_t *zbin_boost_ptr = zbin_boost_orig_ptr;
int idx = 0;
int pre_idx = 0;
vpx_memset(qcoeff_ptr, 0, n_coeffs*sizeof(int16_t));
vpx_memset(dqcoeff_ptr, 0, n_coeffs*sizeof(int16_t));
eob = -1;
// Base ZBIN
zbins[0] = zbin_ptr[0] + zbin_oq_value;
zbins[1] = zbin_ptr[1] + zbin_oq_value;
// Positive and negative ZBIN
pzbins[0] = zbins[0]/mul;
pzbins[1] = zbins[1]/mul;
nzbins[0] = pzbins[0] * -1;
nzbins[1] = pzbins[1] * -1;
if (!skip_block) {
// Pre-scan pass
for (i = 0; i < n_coeffs; i++) {
rc = scan[i];
z = coeff_ptr[rc];
// If the coefficient is out of the base ZBIN range, keep it for
// quantization.
if (z >= pzbins[rc != 0] || z <= nzbins[rc != 0])
idx_arr[idx++] = i;
}
// Quantization pass: only process the coefficients selected in
// pre-scan pass. Note: idx can be zero.
for (i = 0; i < idx; i++) {
rc = scan[idx_arr[i]];
// Calculate ZBIN
zero_run += idx_arr[i] - pre_idx;
if(zero_run > 15) zero_run = 15;
zbin = (zbins[rc != 0] + zbin_boost_ptr[zero_run]);
pre_idx = idx_arr[i];
z = coeff_ptr[rc] * mul;
sz = (z >> 31); // sign of z
x = (z ^ sz) - sz; // x = abs(z)
if (x >= zbin) {
x += (round_ptr[rc != 0]);
y = ((int)(((int)(x * quant_ptr[rc != 0]) >> 16) + x))
>> quant_shift_ptr[rc != 0]; // quantize (x)
x = (y ^ sz) - sz; // get the sign back
qcoeff_ptr[rc] = x; // write to destination
dqcoeff_ptr[rc] = x * dequant_ptr[rc != 0] / mul; // dequantized value
if (y) {
eob = idx_arr[i]; // last nonzero coeffs
zero_run = -1; // set zero_run
}
}
}
}
*eob_ptr = eob + 1;
}
#if 0
// Original quantize function
static void quantize(int16_t *zbin_boost_orig_ptr,
int16_t *coeff_ptr, int n_coeffs, int skip_block,
int16_t *zbin_ptr, int16_t *round_ptr, int16_t *quant_ptr,
@ -74,6 +221,7 @@ static void quantize(int16_t *zbin_boost_orig_ptr,
*eob_ptr = eob + 1;
}
#endif
void vp9_quantize(MACROBLOCK *mb, int plane, int block, int n_coeffs,
TX_TYPE tx_type) {
@ -97,19 +245,40 @@ void vp9_quantize(MACROBLOCK *mb, int plane, int block, int n_coeffs,
break;
}
quantize(mb->plane[plane].zrun_zbin_boost,
BLOCK_OFFSET(mb->plane[plane].coeff, block, 16),
n_coeffs, mb->skip_block,
mb->plane[plane].zbin,
mb->plane[plane].round,
mb->plane[plane].quant,
mb->plane[plane].quant_shift,
BLOCK_OFFSET(xd->plane[plane].qcoeff, block, 16),
BLOCK_OFFSET(xd->plane[plane].dqcoeff, block, 16),
xd->plane[plane].dequant,
mb->plane[plane].zbin_extra,
&xd->plane[plane].eobs[block],
scan, mul);
// Call different quantization for different transform size.
if (n_coeffs >= 1024) {
// Save index of picked coefficient in pre-scan pass.
int idx_arr[1024];
quantize_sparse(mb->plane[plane].zrun_zbin_boost,
BLOCK_OFFSET(mb->plane[plane].coeff, block, 16),
n_coeffs, mb->skip_block,
mb->plane[plane].zbin,
mb->plane[plane].round,
mb->plane[plane].quant,
mb->plane[plane].quant_shift,
BLOCK_OFFSET(xd->plane[plane].qcoeff, block, 16),
BLOCK_OFFSET(xd->plane[plane].dqcoeff, block, 16),
xd->plane[plane].dequant,
mb->plane[plane].zbin_extra,
&xd->plane[plane].eobs[block],
scan, mul, idx_arr);
}
else {
quantize(mb->plane[plane].zrun_zbin_boost,
BLOCK_OFFSET(mb->plane[plane].coeff, block, 16),
n_coeffs, mb->skip_block,
mb->plane[plane].zbin,
mb->plane[plane].round,
mb->plane[plane].quant,
mb->plane[plane].quant_shift,
BLOCK_OFFSET(xd->plane[plane].qcoeff, block, 16),
BLOCK_OFFSET(xd->plane[plane].dqcoeff, block, 16),
xd->plane[plane].dequant,
mb->plane[plane].zbin_extra,
&xd->plane[plane].eobs[block],
scan, mul);
}
}
void vp9_regular_quantize_b_4x4(MACROBLOCK *mb, int b_idx, TX_TYPE tx_type,