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dec_neon.c: add TransformAC3

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based on SSE2 version

Change-Id: Icc6782955253c98e83d5984153b596ef5f1c0d34
This commit is contained in:
James Zern 2014-02-08 03:11:34 +01:00
parent 32aeaf115a
commit 228e4877ab
1 changed files with 52 additions and 2 deletions
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54
src/dsp/dec_neon.c
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@ -16,6 +16,8 @@
#if defined(WEBP_USE_NEON)
#include <arm_neon.h>
#include "../dec/vp8i.h"
#define QRegs "q0", "q1", "q2", "q3", \
@ -410,6 +412,55 @@ static void TransformWHT(const int16_t* in, int16_t* out) {
);
}
//------------------------------------------------------------------------------
#define MUL(a, b) (((a) * (b)) >> 16)
static void TransformAC3(const int16_t* in, uint8_t* dst) {
static const int kC1 = 20091 + (1 << 16);
static const int kC2 = 35468;
const int16x8_t A = vdupq_n_s16(in[0] + 4);
const int16x8_t c4 = vdupq_n_s16(MUL(in[4], kC2));
const int16x8_t d4 = vdupq_n_s16(MUL(in[4], kC1));
const int c1 = MUL(in[1], kC2);
const int d1 = MUL(in[1], kC1);
const int16x8_t CD = {d1, c1, -c1, -d1, 0, 0, 0, 0};
const int16x8_t B = vqaddq_s16(A, CD);
const int16x8_t m0 = vqaddq_s16(B, d4);
const int16x8_t m1 = vqaddq_s16(B, c4);
const int16x8_t m2 = vqsubq_s16(B, c4);
const int16x8_t m3 = vqsubq_s16(B, d4);
// Load the source pixels and convert to 16b.
int16x8_t dst0 = vreinterpretq_s16_u16(
vmovl_u8(vcreate_u8(*(uint32_t*)(dst + 0 * BPS))));
int16x8_t dst1 = vreinterpretq_s16_u16(
vmovl_u8(vcreate_u8(*(uint32_t*)(dst + 1 * BPS))));
int16x8_t dst2 = vreinterpretq_s16_u16(
vmovl_u8(vcreate_u8(*(uint32_t*)(dst + 2 * BPS))));
int16x8_t dst3 = vreinterpretq_s16_u16(
vmovl_u8(vcreate_u8(*(uint32_t*)(dst + 3 * BPS))));
// Add the inverse transform.
dst0 = vsraq_n_s16(dst0, m0, 3);
dst1 = vsraq_n_s16(dst1, m1, 3);
dst2 = vsraq_n_s16(dst2, m2, 3);
dst3 = vsraq_n_s16(dst3, m3, 3);
{
// Unsigned saturate to 8b.
const uint8x8_t dst0_ = vqmovun_s16(dst0);
const uint8x8_t dst1_ = vqmovun_s16(dst1);
const uint8x8_t dst2_ = vqmovun_s16(dst2);
const uint8x8_t dst3_ = vqmovun_s16(dst3);
// Store the results.
*(int*)(dst + 0 * BPS) = vget_lane_s32(vreinterpret_s32_u8(dst0_), 0);
*(int*)(dst + 1 * BPS) = vget_lane_s32(vreinterpret_s32_u8(dst1_), 0);
*(int*)(dst + 2 * BPS) = vget_lane_s32(vreinterpret_s32_u8(dst2_), 0);
*(int*)(dst + 3 * BPS) = vget_lane_s32(vreinterpret_s32_u8(dst3_), 0);
}
}
#undef MUL
#endif // WEBP_USE_NEON
//------------------------------------------------------------------------------
@ -420,7 +471,7 @@ extern void VP8DspInitNEON(void);
void VP8DspInitNEON(void) {
#if defined(WEBP_USE_NEON)
VP8Transform = TransformTwo;
VP8TransformAC3 = TransformOne; // no special code here
VP8TransformAC3 = TransformAC3;
VP8TransformDC = TransformDC;
VP8TransformWHT = TransformWHT;
@ -430,4 +481,3 @@ void VP8DspInitNEON(void) {
VP8SimpleHFilter16i = SimpleHFilter16iNEON;
#endif // WEBP_USE_NEON
}