124 строки
4.7 KiB
C
124 строки
4.7 KiB
C
/*
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* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef VPX_DSP_INV_TXFM_H_
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#define VPX_DSP_INV_TXFM_H_
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#include <assert.h>
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#include "./vpx_config.h"
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#include "vpx_dsp/txfm_common.h"
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#include "vpx_ports/mem.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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static INLINE tran_low_t check_range(tran_high_t input) {
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#if CONFIG_COEFFICIENT_RANGE_CHECKING
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// For valid VP9 input streams, intermediate stage coefficients should always
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// stay within the range of a signed 16 bit integer. Coefficients can go out
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// of this range for invalid/corrupt VP9 streams. However, strictly checking
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// this range for every intermediate coefficient can burdensome for a decoder,
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// therefore the following assertion is only enabled when configured with
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// --enable-coefficient-range-checking.
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assert(INT16_MIN <= input);
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assert(input <= INT16_MAX);
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#endif // CONFIG_COEFFICIENT_RANGE_CHECKING
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return (tran_low_t)input;
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}
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static INLINE tran_low_t dct_const_round_shift(tran_high_t input) {
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tran_high_t rv = ROUND_POWER_OF_TWO(input, DCT_CONST_BITS);
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return check_range(rv);
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}
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#if CONFIG_VP9_HIGHBITDEPTH
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static INLINE tran_low_t highbd_check_range(tran_high_t input,
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int bd) {
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#if CONFIG_COEFFICIENT_RANGE_CHECKING
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// For valid highbitdepth VP9 streams, intermediate stage coefficients will
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// stay within the ranges:
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// - 8 bit: signed 16 bit integer
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// - 10 bit: signed 18 bit integer
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// - 12 bit: signed 20 bit integer
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const int32_t int_max = (1 << (7 + bd)) - 1;
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const int32_t int_min = -int_max - 1;
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assert(int_min <= input);
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assert(input <= int_max);
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(void) int_min;
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#endif // CONFIG_COEFFICIENT_RANGE_CHECKING
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(void) bd;
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return (tran_low_t)input;
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}
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static INLINE tran_low_t highbd_dct_const_round_shift(tran_high_t input,
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int bd) {
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tran_high_t rv = ROUND_POWER_OF_TWO(input, DCT_CONST_BITS);
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return highbd_check_range(rv, bd);
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}
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#endif // CONFIG_VP9_HIGHBITDEPTH
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#if CONFIG_EMULATE_HARDWARE
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// When CONFIG_EMULATE_HARDWARE is 1 the transform performs a
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// non-normative method to handle overflows. A stream that causes
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// overflows in the inverse transform is considered invalid in VP9,
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// and a hardware implementer is free to choose any reasonable
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// method to handle overflows. However to aid in hardware
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// verification they can use a specific implementation of the
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// WRAPLOW() macro below that is identical to their intended
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// hardware implementation (and also use configure options to trigger
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// the C-implementation of the transform).
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//
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// The particular WRAPLOW implementation below performs strict
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// overflow wrapping to match common hardware implementations.
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// bd of 8 uses trans_low with 16bits, need to remove 16bits
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// bd of 10 uses trans_low with 18bits, need to remove 14bits
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// bd of 12 uses trans_low with 20bits, need to remove 12bits
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// bd of x uses trans_low with 8+x bits, need to remove 24-x bits
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#define WRAPLOW(x, bd) ((((int32_t)(x)) << (24 - bd)) >> (24 - bd))
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#else
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#define WRAPLOW(x, bd) ((int32_t)(x))
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#endif // CONFIG_EMULATE_HARDWARE
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void idct4_c(const tran_low_t *input, tran_low_t *output);
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void idct8_c(const tran_low_t *input, tran_low_t *output);
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void idct16_c(const tran_low_t *input, tran_low_t *output);
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void idct32_c(const tran_low_t *input, tran_low_t *output);
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void iadst4_c(const tran_low_t *input, tran_low_t *output);
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void iadst8_c(const tran_low_t *input, tran_low_t *output);
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void iadst16_c(const tran_low_t *input, tran_low_t *output);
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#if CONFIG_VP9_HIGHBITDEPTH
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void vpx_highbd_idct4_c(const tran_low_t *input, tran_low_t *output, int bd);
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void vpx_highbd_idct8_c(const tran_low_t *input, tran_low_t *output, int bd);
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void vpx_highbd_idct16_c(const tran_low_t *input, tran_low_t *output, int bd);
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void vpx_highbd_iadst4_c(const tran_low_t *input, tran_low_t *output, int bd);
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void vpx_highbd_iadst8_c(const tran_low_t *input, tran_low_t *output, int bd);
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void vpx_highbd_iadst16_c(const tran_low_t *input, tran_low_t *output, int bd);
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static INLINE uint16_t highbd_clip_pixel_add(uint16_t dest, tran_high_t trans,
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int bd) {
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trans = WRAPLOW(trans, bd);
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return clip_pixel_highbd(WRAPLOW(dest + trans, bd), bd);
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}
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#endif
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static INLINE uint8_t clip_pixel_add(uint8_t dest, tran_high_t trans) {
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trans = WRAPLOW(trans, 8);
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return clip_pixel(WRAPLOW(dest + trans, 8));
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}
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // VPX_DSP_INV_TXFM_H_
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