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Diffstat (limited to 'thirdparty/libvpx/vpx_dsp/inv_txfm.h')
| -rw-r--r-- | thirdparty/libvpx/vpx_dsp/inv_txfm.h | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/thirdparty/libvpx/vpx_dsp/inv_txfm.h b/thirdparty/libvpx/vpx_dsp/inv_txfm.h new file mode 100644 index 0000000000..9cfe1be3a7 --- /dev/null +++ b/thirdparty/libvpx/vpx_dsp/inv_txfm.h @@ -0,0 +1,133 @@ +/* + * 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_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 (tran_high_t)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 (tran_high_t)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 idct4_c(const tran_low_t *input, tran_low_t *output); +void idct8_c(const tran_low_t *input, tran_low_t *output); +void idct16_c(const tran_low_t *input, tran_low_t *output); +void idct32_c(const tran_low_t *input, tran_low_t *output); +void iadst4_c(const tran_low_t *input, tran_low_t *output); +void iadst8_c(const tran_low_t *input, tran_low_t *output); +void iadst16_c(const tran_low_t *input, tran_low_t *output); + +#if CONFIG_VP9_HIGHBITDEPTH +void vpx_highbd_idct4_c(const tran_low_t *input, tran_low_t *output, int bd); +void vpx_highbd_idct8_c(const tran_low_t *input, tran_low_t *output, int bd); +void vpx_highbd_idct16_c(const tran_low_t *input, tran_low_t *output, int bd); + +void vpx_highbd_iadst4_c(const tran_low_t *input, tran_low_t *output, int bd); +void vpx_highbd_iadst8_c(const tran_low_t *input, tran_low_t *output, int bd); +void vpx_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 // VPX_DSP_INV_TXFM_H_ |