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, 91 insertions, 0 deletions

diff --git a/third_party/aom/aom_dsp/inv_txfm.h b/third_party/aom/aom_dsp/inv_txfm.h
new file mode 100644
index 000000000..e64d463ea
--- /dev/null
+++ b/third_party/aom/aom_dsp/inv_txfm.h
@@ -0,0 +1,91 @@
+/*
+ * 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.
+ */
+
+#ifndef AOM_DSP_INV_TXFM_H_
+#define AOM_DSP_INV_TXFM_H_
+
+#include <assert.h>
+
+#include "./aom_config.h"
+#include "aom_dsp/txfm_common.h"
+#include "aom_ports/mem.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+static INLINE tran_high_t dct_const_round_shift(tran_high_t input) {
+  tran_high_t rv = ROUND_POWER_OF_TWO(input, DCT_CONST_BITS);
+  return rv;
+}
+
+static INLINE tran_high_t check_range(tran_high_t input, int bd) {
+#if CONFIG_COEFFICIENT_RANGE_CHECKING
+  // For valid AV1 input streams, intermediate stage coefficients should always
+  // stay within the range of a signed 16 bit integer. Coefficients can go out
+  // of this range for invalid/corrupt AV1 streams. However, strictly checking
+  // this range for every intermediate coefficient can burdensome for a decoder,
+  // therefore the following assertion is only enabled when configured with
+  // --enable-coefficient-range-checking.
+  // For valid highbitdepth AV1 streams, intermediate stage coefficients will
+  // stay within the ranges:
+  // - 8 bit: signed 16 bit integer
+  // - 10 bit: signed 18 bit integer
+  // - 12 bit: signed 20 bit integer
+  const int32_t int_max = (1 << (7 + bd)) - 1;
+  const int32_t int_min = -int_max - 1;
+  assert(int_min <= input);
+  assert(input <= int_max);
+  (void)int_min;
+#endif  // CONFIG_COEFFICIENT_RANGE_CHECKING
+  (void)bd;
+  return input;
+}
+
+#define WRAPLOW(x) ((int32_t)check_range(x, 8))
+#if CONFIG_HIGHBITDEPTH
+#define HIGHBD_WRAPLOW(x, bd) ((int32_t)check_range((x), bd))
+#endif  // CONFIG_HIGHBITDEPTH
+
+void aom_idct4_c(const tran_low_t *input, tran_low_t *output);
+void aom_idct8_c(const tran_low_t *input, tran_low_t *output);
+void aom_idct16_c(const tran_low_t *input, tran_low_t *output);
+void aom_idct32_c(const tran_low_t *input, tran_low_t *output);
+void aom_iadst4_c(const tran_low_t *input, tran_low_t *output);
+void aom_iadst8_c(const tran_low_t *input, tran_low_t *output);
+void aom_iadst16_c(const tran_low_t *input, tran_low_t *output);
+
+#if CONFIG_HIGHBITDEPTH
+void aom_highbd_idct4_c(const tran_low_t *input, tran_low_t *output, int bd);
+void aom_highbd_idct8_c(const tran_low_t *input, tran_low_t *output, int bd);
+void aom_highbd_idct16_c(const tran_low_t *input, tran_low_t *output, int bd);
+void aom_highbd_idct32_c(const tran_low_t *input, tran_low_t *output, int bd);
+
+void aom_highbd_iadst4_c(const tran_low_t *input, tran_low_t *output, int bd);
+void aom_highbd_iadst8_c(const tran_low_t *input, tran_low_t *output, int bd);
+void aom_highbd_iadst16_c(const tran_low_t *input, tran_low_t *output, int bd);
+
+static INLINE uint16_t highbd_clip_pixel_add(uint16_t dest, tran_high_t trans,
+                                             int bd) {
+  trans = HIGHBD_WRAPLOW(trans, bd);
+  return clip_pixel_highbd(dest + (int)trans, bd);
+}
+#endif
+
+static INLINE uint8_t clip_pixel_add(uint8_t dest, tran_high_t trans) {
+  trans = WRAPLOW(trans);
+  return clip_pixel(dest + (int)trans);
+}
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // AOM_DSP_INV_TXFM_H_