Import aom library

This is the reference implementation for the Alliance for Open Media's av1 video code.

The commit used was 4d668d7feb1f8abd809d1bca0418570a7f142a36.

1 files changed, 227 insertions, 0 deletions

diff --git a/third_party/aom/av1/common/arm/neon/iht4x4_add_neon.c b/third_party/aom/av1/common/arm/neon/iht4x4_add_neon.c
new file mode 100644
index 000000000..02572d405
--- /dev/null
+++ b/third_party/aom/av1/common/arm/neon/iht4x4_add_neon.c
@@ -0,0 +1,227 @@
+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#include <arm_neon.h>
+#include <assert.h>
+
+#include "./aom_config.h"
+#include "./av1_rtcd.h"
+#include "aom_dsp/txfm_common.h"
+#include "av1/common/common.h"
+
+static INLINE void TRANSPOSE4X4(int16x8_t *q8s16, int16x8_t *q9s16) {
+  int32x4_t q8s32, q9s32;
+  int16x4x2_t d0x2s16, d1x2s16;
+  int32x4x2_t q0x2s32;
+
+  d0x2s16 = vtrn_s16(vget_low_s16(*q8s16), vget_high_s16(*q8s16));
+  d1x2s16 = vtrn_s16(vget_low_s16(*q9s16), vget_high_s16(*q9s16));
+
+  q8s32 = vreinterpretq_s32_s16(vcombine_s16(d0x2s16.val[0], d0x2s16.val[1]));
+  q9s32 = vreinterpretq_s32_s16(vcombine_s16(d1x2s16.val[0], d1x2s16.val[1]));
+  q0x2s32 = vtrnq_s32(q8s32, q9s32);
+
+  *q8s16 = vreinterpretq_s16_s32(q0x2s32.val[0]);
+  *q9s16 = vreinterpretq_s16_s32(q0x2s32.val[1]);
+  return;
+}
+
+static INLINE void GENERATE_COSINE_CONSTANTS(int16x4_t *d0s16, int16x4_t *d1s16,
+                                             int16x4_t *d2s16) {
+  *d0s16 = vdup_n_s16((int16_t)cospi_8_64);
+  *d1s16 = vdup_n_s16((int16_t)cospi_16_64);
+  *d2s16 = vdup_n_s16((int16_t)cospi_24_64);
+  return;
+}
+
+static INLINE void GENERATE_SINE_CONSTANTS(int16x4_t *d3s16, int16x4_t *d4s16,
+                                           int16x4_t *d5s16, int16x8_t *q3s16) {
+  *d3s16 = vdup_n_s16((int16_t)sinpi_1_9);
+  *d4s16 = vdup_n_s16((int16_t)sinpi_2_9);
+  *q3s16 = vdupq_n_s16((int16_t)sinpi_3_9);
+  *d5s16 = vdup_n_s16((int16_t)sinpi_4_9);
+  return;
+}
+
+static INLINE void IDCT4x4_1D(int16x4_t *d0s16, int16x4_t *d1s16,
+                              int16x4_t *d2s16, int16x8_t *q8s16,
+                              int16x8_t *q9s16) {
+  int16x4_t d16s16, d17s16, d18s16, d19s16, d23s16, d24s16;
+  int16x4_t d26s16, d27s16, d28s16, d29s16;
+  int32x4_t q10s32, q13s32, q14s32, q15s32;
+  int16x8_t q13s16, q14s16;
+
+  d16s16 = vget_low_s16(*q8s16);
+  d17s16 = vget_high_s16(*q8s16);
+  d18s16 = vget_low_s16(*q9s16);
+  d19s16 = vget_high_s16(*q9s16);
+
+  d23s16 = vadd_s16(d16s16, d18s16);
+  d24s16 = vsub_s16(d16s16, d18s16);
+
+  q15s32 = vmull_s16(d17s16, *d2s16);
+  q10s32 = vmull_s16(d17s16, *d0s16);
+  q13s32 = vmull_s16(d23s16, *d1s16);
+  q14s32 = vmull_s16(d24s16, *d1s16);
+  q15s32 = vmlsl_s16(q15s32, d19s16, *d0s16);
+  q10s32 = vmlal_s16(q10s32, d19s16, *d2s16);
+
+  d26s16 = vqrshrn_n_s32(q13s32, 14);
+  d27s16 = vqrshrn_n_s32(q14s32, 14);
+  d29s16 = vqrshrn_n_s32(q15s32, 14);
+  d28s16 = vqrshrn_n_s32(q10s32, 14);
+
+  q13s16 = vcombine_s16(d26s16, d27s16);
+  q14s16 = vcombine_s16(d28s16, d29s16);
+  *q8s16 = vaddq_s16(q13s16, q14s16);
+  *q9s16 = vsubq_s16(q13s16, q14s16);
+  *q9s16 = vcombine_s16(vget_high_s16(*q9s16), vget_low_s16(*q9s16));  // vswp
+  return;
+}
+
+static INLINE void IADST4x4_1D(int16x4_t *d3s16, int16x4_t *d4s16,
+                               int16x4_t *d5s16, int16x8_t *q3s16,
+                               int16x8_t *q8s16, int16x8_t *q9s16) {
+  int16x4_t d6s16, d16s16, d17s16, d18s16, d19s16;
+  int32x4_t q8s32, q9s32, q10s32, q11s32, q12s32, q13s32, q14s32, q15s32;
+
+  d6s16 = vget_low_s16(*q3s16);
+
+  d16s16 = vget_low_s16(*q8s16);
+  d17s16 = vget_high_s16(*q8s16);
+  d18s16 = vget_low_s16(*q9s16);
+  d19s16 = vget_high_s16(*q9s16);
+
+  q10s32 = vmull_s16(*d3s16, d16s16);
+  q11s32 = vmull_s16(*d4s16, d16s16);
+  q12s32 = vmull_s16(d6s16, d17s16);
+  q13s32 = vmull_s16(*d5s16, d18s16);
+  q14s32 = vmull_s16(*d3s16, d18s16);
+  q15s32 = vmovl_s16(d16s16);
+  q15s32 = vaddw_s16(q15s32, d19s16);
+  q8s32 = vmull_s16(*d4s16, d19s16);
+  q15s32 = vsubw_s16(q15s32, d18s16);
+  q9s32 = vmull_s16(*d5s16, d19s16);
+
+  q10s32 = vaddq_s32(q10s32, q13s32);
+  q10s32 = vaddq_s32(q10s32, q8s32);
+  q11s32 = vsubq_s32(q11s32, q14s32);
+  q8s32 = vdupq_n_s32((int32_t)sinpi_3_9);
+  q11s32 = vsubq_s32(q11s32, q9s32);
+  q15s32 = vmulq_s32(q15s32, q8s32);
+
+  q13s32 = vaddq_s32(q10s32, q12s32);
+  q10s32 = vaddq_s32(q10s32, q11s32);
+  q14s32 = vaddq_s32(q11s32, q12s32);
+  q10s32 = vsubq_s32(q10s32, q12s32);
+
+  d16s16 = vqrshrn_n_s32(q13s32, 14);
+  d17s16 = vqrshrn_n_s32(q14s32, 14);
+  d18s16 = vqrshrn_n_s32(q15s32, 14);
+  d19s16 = vqrshrn_n_s32(q10s32, 14);
+
+  *q8s16 = vcombine_s16(d16s16, d17s16);
+  *q9s16 = vcombine_s16(d18s16, d19s16);
+  return;
+}
+
+void av1_iht4x4_16_add_neon(const tran_low_t *input, uint8_t *dest,
+                            int dest_stride, int tx_type) {
+  uint8x8_t d26u8, d27u8;
+  int16x4_t d0s16, d1s16, d2s16, d3s16, d4s16, d5s16;
+  uint32x2_t d26u32, d27u32;
+  int16x8_t q3s16, q8s16, q9s16;
+  uint16x8_t q8u16, q9u16;
+
+  d26u32 = d27u32 = vdup_n_u32(0);
+
+  q8s16 = vld1q_s16(input);
+  q9s16 = vld1q_s16(input + 8);
+
+  TRANSPOSE4X4(&q8s16, &q9s16);
+
+  switch (tx_type) {
+    case 0:  // idct_idct is not supported. Fall back to C
+      av1_iht4x4_16_add_c(input, dest, dest_stride, tx_type);
+      return;
+      break;
+    case 1:  // iadst_idct
+      // generate constants
+      GENERATE_COSINE_CONSTANTS(&d0s16, &d1s16, &d2s16);
+      GENERATE_SINE_CONSTANTS(&d3s16, &d4s16, &d5s16, &q3s16);
+
+      // first transform rows
+      IDCT4x4_1D(&d0s16, &d1s16, &d2s16, &q8s16, &q9s16);
+
+      // transpose the matrix
+      TRANSPOSE4X4(&q8s16, &q9s16);
+
+      // then transform columns
+      IADST4x4_1D(&d3s16, &d4s16, &d5s16, &q3s16, &q8s16, &q9s16);
+      break;
+    case 2:  // idct_iadst
+      // generate constantsyy
+      GENERATE_COSINE_CONSTANTS(&d0s16, &d1s16, &d2s16);
+      GENERATE_SINE_CONSTANTS(&d3s16, &d4s16, &d5s16, &q3s16);
+
+      // first transform rows
+      IADST4x4_1D(&d3s16, &d4s16, &d5s16, &q3s16, &q8s16, &q9s16);
+
+      // transpose the matrix
+      TRANSPOSE4X4(&q8s16, &q9s16);
+
+      // then transform columns
+      IDCT4x4_1D(&d0s16, &d1s16, &d2s16, &q8s16, &q9s16);
+      break;
+    case 3:  // iadst_iadst
+      // generate constants
+      GENERATE_SINE_CONSTANTS(&d3s16, &d4s16, &d5s16, &q3s16);
+
+      // first transform rows
+      IADST4x4_1D(&d3s16, &d4s16, &d5s16, &q3s16, &q8s16, &q9s16);
+
+      // transpose the matrix
+      TRANSPOSE4X4(&q8s16, &q9s16);
+
+      // then transform columns
+      IADST4x4_1D(&d3s16, &d4s16, &d5s16, &q3s16, &q8s16, &q9s16);
+      break;
+    default:  // iadst_idct
+      assert(0);
+      break;
+  }
+
+  q8s16 = vrshrq_n_s16(q8s16, 4);
+  q9s16 = vrshrq_n_s16(q9s16, 4);
+
+  d26u32 = vld1_lane_u32((const uint32_t *)dest, d26u32, 0);
+  dest += dest_stride;
+  d26u32 = vld1_lane_u32((const uint32_t *)dest, d26u32, 1);
+  dest += dest_stride;
+  d27u32 = vld1_lane_u32((const uint32_t *)dest, d27u32, 0);
+  dest += dest_stride;
+  d27u32 = vld1_lane_u32((const uint32_t *)dest, d27u32, 1);
+
+  q8u16 = vaddw_u8(vreinterpretq_u16_s16(q8s16), vreinterpret_u8_u32(d26u32));
+  q9u16 = vaddw_u8(vreinterpretq_u16_s16(q9s16), vreinterpret_u8_u32(d27u32));
+
+  d26u8 = vqmovun_s16(vreinterpretq_s16_u16(q8u16));
+  d27u8 = vqmovun_s16(vreinterpretq_s16_u16(q9u16));
+
+  vst1_lane_u32((uint32_t *)dest, vreinterpret_u32_u8(d27u8), 1);
+  dest -= dest_stride;
+  vst1_lane_u32((uint32_t *)dest, vreinterpret_u32_u8(d27u8), 0);
+  dest -= dest_stride;
+  vst1_lane_u32((uint32_t *)dest, vreinterpret_u32_u8(d26u8), 1);
+  dest -= dest_stride;
+  vst1_lane_u32((uint32_t *)dest, vreinterpret_u32_u8(d26u8), 0);
+  return;
+}