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-rw-r--r--third_party/aom/aom_dsp/inv_txfm.h91
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
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+/*
+ * 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_