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Diffstat (limited to '')
-rw-r--r-- | third_party/aom/av1/common/scale.h | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/third_party/aom/av1/common/scale.h b/third_party/aom/av1/common/scale.h new file mode 100644 index 0000000000..d8481bfc2c --- /dev/null +++ b/third_party/aom/av1/common/scale.h @@ -0,0 +1,87 @@ +/* + * 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_AV1_COMMON_SCALE_H_ +#define AOM_AV1_COMMON_SCALE_H_ + +#include "av1/common/convolve.h" +#include "av1/common/mv.h" + +#ifdef __cplusplus +extern "C" { +#endif + +#define SCALE_NUMERATOR 8 + +#define REF_SCALE_SHIFT 14 +#define REF_NO_SCALE (1 << REF_SCALE_SHIFT) +#define REF_INVALID_SCALE -1 + +struct scale_factors { + int x_scale_fp; // horizontal fixed point scale factor + int y_scale_fp; // vertical fixed point scale factor + int x_step_q4; + int y_step_q4; +}; + +// Note: Expect val to be in q4 precision +static INLINE int av1_scaled_x(int val, const struct scale_factors *sf) { + const int off = + (sf->x_scale_fp - (1 << REF_SCALE_SHIFT)) * (1 << (SUBPEL_BITS - 1)); + const int64_t tval = (int64_t)val * sf->x_scale_fp + off; + return (int)ROUND_POWER_OF_TWO_SIGNED_64(tval, + REF_SCALE_SHIFT - SCALE_EXTRA_BITS); +} + +// Note: Expect val to be in q4 precision +static INLINE int av1_scaled_y(int val, const struct scale_factors *sf) { + const int off = + (sf->y_scale_fp - (1 << REF_SCALE_SHIFT)) * (1 << (SUBPEL_BITS - 1)); + const int64_t tval = (int64_t)val * sf->y_scale_fp + off; + return (int)ROUND_POWER_OF_TWO_SIGNED_64(tval, + REF_SCALE_SHIFT - SCALE_EXTRA_BITS); +} + +// Note: Expect val to be in q4 precision +static INLINE int av1_unscaled_value(int val, const struct scale_factors *sf) { + (void)sf; + return val * (1 << SCALE_EXTRA_BITS); +} + +MV32 av1_scale_mv(const MV *mv, int x, int y, const struct scale_factors *sf); + +void av1_setup_scale_factors_for_frame(struct scale_factors *sf, int other_w, + int other_h, int this_w, int this_h); + +static INLINE int av1_is_valid_scale(const struct scale_factors *sf) { + assert(sf != NULL); + return sf->x_scale_fp != REF_INVALID_SCALE && + sf->y_scale_fp != REF_INVALID_SCALE; +} + +static INLINE int av1_is_scaled(const struct scale_factors *sf) { + assert(sf != NULL); + return av1_is_valid_scale(sf) && + (sf->x_scale_fp != REF_NO_SCALE || sf->y_scale_fp != REF_NO_SCALE); +} + +// See AV1 spec, Section 6.8.6. Frame size with refs semantics. +static INLINE int valid_ref_frame_size(int ref_width, int ref_height, + int this_width, int this_height) { + return 2 * this_width >= ref_width && 2 * this_height >= ref_height && + this_width <= 16 * ref_width && this_height <= 16 * ref_height; +} + +#ifdef __cplusplus +} // extern "C" +#endif + +#endif // AOM_AV1_COMMON_SCALE_H_ |