| /* |
| * Copyright (c) 2010 The WebM project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| #ifndef VPX_DSP_INV_TXFM_H_ |
| #define VPX_DSP_INV_TXFM_H_ |
| |
| #include <assert.h> |
| |
| #include "./vpx_config.h" |
| #include "vpx_dsp/txfm_common.h" |
| #include "vpx_dsp/inv_txfm.h" |
| #include "vpx_ports/mem.h" |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| static INLINE tran_high_t check_range(tran_high_t input) { |
| #if CONFIG_COEFFICIENT_RANGE_CHECKING |
| // For valid VP9 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 VP9 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. |
| assert(INT16_MIN <= input); |
| assert(input <= INT16_MAX); |
| #endif // CONFIG_COEFFICIENT_RANGE_CHECKING |
| return input; |
| } |
| |
| 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; |
| } |
| |
| #if CONFIG_VP9_HIGHBITDEPTH |
| static INLINE tran_high_t highbd_check_range(tran_high_t input, |
| int bd) { |
| #if CONFIG_COEFFICIENT_RANGE_CHECKING |
| // For valid highbitdepth VP9 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; |
| } |
| |
| static INLINE tran_high_t highbd_dct_const_round_shift(tran_high_t input) { |
| tran_high_t rv = ROUND_POWER_OF_TWO(input, DCT_CONST_BITS); |
| return rv; |
| } |
| #endif // CONFIG_VP9_HIGHBITDEPTH |
| |
| #if CONFIG_EMULATE_HARDWARE |
| // When CONFIG_EMULATE_HARDWARE is 1 the transform performs a |
| // non-normative method to handle overflows. A stream that causes |
| // overflows in the inverse transform is considered invalid in VP9, |
| // and a hardware implementer is free to choose any reasonable |
| // method to handle overflows. However to aid in hardware |
| // verification they can use a specific implementation of the |
| // WRAPLOW() macro below that is identical to their intended |
| // hardware implementation (and also use configure options to trigger |
| // the C-implementation of the transform). |
| // |
| // The particular WRAPLOW implementation below performs strict |
| // overflow wrapping to match common hardware implementations. |
| // bd of 8 uses trans_low with 16bits, need to remove 16bits |
| // bd of 10 uses trans_low with 18bits, need to remove 14bits |
| // bd of 12 uses trans_low with 20bits, need to remove 12bits |
| // bd of x uses trans_low with 8+x bits, need to remove 24-x bits |
| |
| #define WRAPLOW(x) ((((int32_t)check_range(x)) << 16) >> 16) |
| #if CONFIG_VP9_HIGHBITDEPTH |
| #define HIGHBD_WRAPLOW(x, bd) \ |
| ((((int32_t)highbd_check_range((x), bd)) << (24 - bd)) >> (24 - bd)) |
| #endif // CONFIG_VP9_HIGHBITDEPTH |
| |
| #else // CONFIG_EMULATE_HARDWARE |
| |
| #define WRAPLOW(x) ((int32_t)check_range(x)) |
| #if CONFIG_VP9_HIGHBITDEPTH |
| #define HIGHBD_WRAPLOW(x, bd) \ |
| ((int32_t)highbd_check_range((x), bd)) |
| #endif // CONFIG_VP9_HIGHBITDEPTH |
| |
| #endif // CONFIG_EMULATE_HARDWARE |
| |
| void vp10_idct4_c(const tran_low_t *input, tran_low_t *output); |
| void vp10_idct8_c(const tran_low_t *input, tran_low_t *output); |
| void vp10_idct16_c(const tran_low_t *input, tran_low_t *output); |
| void vp10_idct32_c(const tran_low_t *input, tran_low_t *output); |
| void vp10_iadst4_c(const tran_low_t *input, tran_low_t *output); |
| void vp10_iadst8_c(const tran_low_t *input, tran_low_t *output); |
| void vp10_iadst16_c(const tran_low_t *input, tran_low_t *output); |
| |
| #if CONFIG_VP9_HIGHBITDEPTH |
| void vp10_highbd_idct4_c(const tran_low_t *input, tran_low_t *output, int bd); |
| void vp10_highbd_idct8_c(const tran_low_t *input, tran_low_t *output, int bd); |
| void vp10_highbd_idct16_c(const tran_low_t *input, tran_low_t *output, int bd); |
| |
| void vp10_highbd_iadst4_c(const tran_low_t *input, tran_low_t *output, int bd); |
| void vp10_highbd_iadst8_c(const tran_low_t *input, tran_low_t *output, int bd); |
| void vp10_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 + trans, bd); |
| } |
| #endif |
| |
| static INLINE uint8_t clip_pixel_add(uint8_t dest, tran_high_t trans) { |
| trans = WRAPLOW(trans); |
| return clip_pixel(dest + trans); |
| } |
| #ifdef __cplusplus |
| } // extern "C" |
| #endif |
| #endif // VPX_DSP_INV_TXFM_H_ |