Commit cc57c5e4 authored by Deb Mukherjee's avatar Deb Mukherjee
Browse files

Iadst transforms to use internal low precision

Change-Id: I266777d40c300bc53b45b205144520b85b0d6e58
(cherry picked from commit a1b726117f5470f227bc90cd030b7d25045dc510)
parent 08d86bc9
......@@ -276,10 +276,10 @@ void vp9_idct8x8_1_add_c(const tran_low_t *input, uint8_t *dest, int stride) {
static void iadst4(const tran_low_t *input, tran_low_t *output) {
tran_high_t s0, s1, s2, s3, s4, s5, s6, s7;
tran_high_t x0 = input[0];
tran_high_t x1 = input[1];
tran_high_t x2 = input[2];
tran_high_t x3 = input[3];
tran_low_t x0 = input[0];
tran_low_t x1 = input[1];
tran_low_t x2 = input[2];
tran_low_t x3 = input[3];
if (!(x0 | x1 | x2 | x3)) {
output[0] = output[1] = output[2] = output[3] = 0;
......@@ -295,24 +295,19 @@ static void iadst4(const tran_low_t *input, tran_low_t *output) {
s6 = sinpi_4_9 * x3;
s7 = x0 - x2 + x3;
x0 = s0 + s3 + s5;
x1 = s1 - s4 - s6;
x2 = sinpi_3_9 * s7;
x3 = s2;
s0 = x0 + x3;
s1 = x1 + x3;
s2 = x2;
s3 = x0 + x1 - x3;
s0 = s0 + s3 + s5;
s1 = s1 - s4 - s6;
s3 = s2;
s2 = sinpi_3_9 * s7;
// 1-D transform scaling factor is sqrt(2).
// The overall dynamic range is 14b (input) + 14b (multiplication scaling)
// + 1b (addition) = 29b.
// Hence the output bit depth is 15b.
output[0] = WRAPLOW(dct_const_round_shift(s0), 8);
output[1] = WRAPLOW(dct_const_round_shift(s1), 8);
output[0] = WRAPLOW(dct_const_round_shift(s0 + s3), 8);
output[1] = WRAPLOW(dct_const_round_shift(s1 + s3), 8);
output[2] = WRAPLOW(dct_const_round_shift(s2), 8);
output[3] = WRAPLOW(dct_const_round_shift(s3), 8);
output[3] = WRAPLOW(dct_const_round_shift(s0 + s1 - s3), 8);
}
void vp9_iht4x4_16_add_c(const tran_low_t *input, uint8_t *dest, int stride,
......@@ -1702,10 +1697,10 @@ void vp9_highbd_idct8x8_1_add_c(const tran_low_t *input, uint8_t *dest8,
static void highbd_iadst4(const tran_low_t *input, tran_low_t *output, int bd) {
tran_high_t s0, s1, s2, s3, s4, s5, s6, s7;
tran_high_t x0 = input[0];
tran_high_t x1 = input[1];
tran_high_t x2 = input[2];
tran_high_t x3 = input[3];
tran_low_t x0 = input[0];
tran_low_t x1 = input[1];
tran_low_t x2 = input[2];
tran_low_t x3 = input[3];
(void) bd;
if (!(x0 | x1 | x2 | x3)) {
......@@ -1720,26 +1715,21 @@ static void highbd_iadst4(const tran_low_t *input, tran_low_t *output, int bd) {
s4 = sinpi_1_9 * x2;
s5 = sinpi_2_9 * x3;
s6 = sinpi_4_9 * x3;
s7 = x0 - x2 + x3;
x0 = s0 + s3 + s5;
x1 = s1 - s4 - s6;
x2 = sinpi_3_9 * s7;
x3 = s2;
s7 = (tran_high_t)(x0 - x2 + x3);
s0 = x0 + x3;
s1 = x1 + x3;
s2 = x2;
s3 = x0 + x1 - x3;
s0 = s0 + s3 + s5;
s1 = s1 - s4 - s6;
s3 = s2;
s2 = sinpi_3_9 * s7;
// 1-D transform scaling factor is sqrt(2).
// The overall dynamic range is 14b (input) + 14b (multiplication scaling)
// + 1b (addition) = 29b.
// Hence the output bit depth is 15b.
output[0] = WRAPLOW(dct_const_round_shift(s0), bd);
output[1] = WRAPLOW(dct_const_round_shift(s1), bd);
output[0] = WRAPLOW(dct_const_round_shift(s0 + s3), bd);
output[1] = WRAPLOW(dct_const_round_shift(s1 + s3), bd);
output[2] = WRAPLOW(dct_const_round_shift(s2), bd);
output[3] = WRAPLOW(dct_const_round_shift(s3), bd);
output[3] = WRAPLOW(dct_const_round_shift(s0 + s1 - s3), bd);
}
void vp9_highbd_iht4x4_16_add_c(const tran_low_t *input, uint8_t *dest8,
......@@ -1779,14 +1769,14 @@ void vp9_highbd_iht4x4_16_add_c(const tran_low_t *input, uint8_t *dest8,
static void highbd_iadst8(const tran_low_t *input, tran_low_t *output, int bd) {
tran_high_t s0, s1, s2, s3, s4, s5, s6, s7;
tran_high_t x0 = input[7];
tran_high_t x1 = input[0];
tran_high_t x2 = input[5];
tran_high_t x3 = input[2];
tran_high_t x4 = input[3];
tran_high_t x5 = input[4];
tran_high_t x6 = input[1];
tran_high_t x7 = input[6];
tran_low_t x0 = input[7];
tran_low_t x1 = input[0];
tran_low_t x2 = input[5];
tran_low_t x3 = input[2];
tran_low_t x4 = input[3];
tran_low_t x5 = input[4];
tran_low_t x6 = input[1];
tran_low_t x7 = input[6];
(void) bd;
if (!(x0 | x1 | x2 | x3 | x4 | x5 | x6 | x7)) {
......@@ -2113,22 +2103,22 @@ static void highbd_iadst16(const tran_low_t *input, tran_low_t *output,
tran_high_t s0, s1, s2, s3, s4, s5, s6, s7, s8;
tran_high_t s9, s10, s11, s12, s13, s14, s15;
tran_high_t x0 = input[15];
tran_high_t x1 = input[0];
tran_high_t x2 = input[13];
tran_high_t x3 = input[2];
tran_high_t x4 = input[11];
tran_high_t x5 = input[4];
tran_high_t x6 = input[9];
tran_high_t x7 = input[6];
tran_high_t x8 = input[7];
tran_high_t x9 = input[8];
tran_high_t x10 = input[5];
tran_high_t x11 = input[10];
tran_high_t x12 = input[3];
tran_high_t x13 = input[12];
tran_high_t x14 = input[1];
tran_high_t x15 = input[14];
tran_low_t x0 = input[15];
tran_low_t x1 = input[0];
tran_low_t x2 = input[13];
tran_low_t x3 = input[2];
tran_low_t x4 = input[11];
tran_low_t x5 = input[4];
tran_low_t x6 = input[9];
tran_low_t x7 = input[6];
tran_low_t x8 = input[7];
tran_low_t x9 = input[8];
tran_low_t x10 = input[5];
tran_low_t x11 = input[10];
tran_low_t x12 = input[3];
tran_low_t x13 = input[12];
tran_low_t x14 = input[1];
tran_low_t x15 = input[14];
(void) bd;
if (!(x0 | x1 | x2 | x3 | x4 | x5 | x6 | x7 | x8
......
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