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Diffstat (limited to 'src/dsp/constants.cc')
| -rw-r--r-- | src/dsp/constants.cc | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/src/dsp/constants.cc b/src/dsp/constants.cc new file mode 100644 index 0000000..0099ca3 --- /dev/null +++ b/src/dsp/constants.cc @@ -0,0 +1,103 @@ +// Copyright 2019 The libgav1 Authors +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +#include "src/dsp/constants.h" + +#include <cstdint> + +namespace libgav1 { + +// Each set of 7 taps is padded with a 0 to easily align and pack into the high +// and low 8 bytes. This way, we can load 16 at a time to fit mulhi and mullo. +const int8_t kFilterIntraTaps[kNumFilterIntraPredictors][8][8] = { + {{-6, 10, 0, 0, 0, 12, 0, 0}, + {-5, 2, 10, 0, 0, 9, 0, 0}, + {-3, 1, 1, 10, 0, 7, 0, 0}, + {-3, 1, 1, 2, 10, 5, 0, 0}, + {-4, 6, 0, 0, 0, 2, 12, 0}, + {-3, 2, 6, 0, 0, 2, 9, 0}, + {-3, 2, 2, 6, 0, 2, 7, 0}, + {-3, 1, 2, 2, 6, 3, 5, 0}}, + {{-10, 16, 0, 0, 0, 10, 0, 0}, + {-6, 0, 16, 0, 0, 6, 0, 0}, + {-4, 0, 0, 16, 0, 4, 0, 0}, + {-2, 0, 0, 0, 16, 2, 0, 0}, + {-10, 16, 0, 0, 0, 0, 10, 0}, + {-6, 0, 16, 0, 0, 0, 6, 0}, + {-4, 0, 0, 16, 0, 0, 4, 0}, + {-2, 0, 0, 0, 16, 0, 2, 0}}, + {{-8, 8, 0, 0, 0, 16, 0, 0}, + {-8, 0, 8, 0, 0, 16, 0, 0}, + {-8, 0, 0, 8, 0, 16, 0, 0}, + {-8, 0, 0, 0, 8, 16, 0, 0}, + {-4, 4, 0, 0, 0, 0, 16, 0}, + {-4, 0, 4, 0, 0, 0, 16, 0}, + {-4, 0, 0, 4, 0, 0, 16, 0}, + {-4, 0, 0, 0, 4, 0, 16, 0}}, + {{-2, 8, 0, 0, 0, 10, 0, 0}, + {-1, 3, 8, 0, 0, 6, 0, 0}, + {-1, 2, 3, 8, 0, 4, 0, 0}, + {0, 1, 2, 3, 8, 2, 0, 0}, + {-1, 4, 0, 0, 0, 3, 10, 0}, + {-1, 3, 4, 0, 0, 4, 6, 0}, + {-1, 2, 3, 4, 0, 4, 4, 0}, + {-1, 2, 2, 3, 4, 3, 3, 0}}, + {{-12, 14, 0, 0, 0, 14, 0, 0}, + {-10, 0, 14, 0, 0, 12, 0, 0}, + {-9, 0, 0, 14, 0, 11, 0, 0}, + {-8, 0, 0, 0, 14, 10, 0, 0}, + {-10, 12, 0, 0, 0, 0, 14, 0}, + {-9, 1, 12, 0, 0, 0, 12, 0}, + {-8, 0, 0, 12, 0, 1, 11, 0}, + {-7, 0, 0, 1, 12, 1, 9, 0}}}; + +// A lookup table replacing the calculation of the variable s in Section 7.17.3 +// (Box filter process). The first index is sgr_proj_index (the lr_sgr_set +// syntax element in the Spec, saved in the sgr_proj_info.index field of a +// RestorationUnitInfo struct). The second index is pass (0 or 1). +// +// const uint8_t scale = kSgrProjParams[sgr_proj_index][pass * 2 + 1]; +// const uint32_t n2_with_scale = n * n * scale; +// const uint32_t s = +// ((1 << kSgrProjScaleBits) + (n2_with_scale >> 1)) / n2_with_scale; +// 0 is an invalid value, corresponding to radius = 0, where the filter is +// skipped. +const uint16_t kSgrScaleParameter[16][2] = { + {140, 3236}, {112, 2158}, {93, 1618}, {80, 1438}, {70, 1295}, {58, 1177}, + {47, 1079}, {37, 996}, {30, 925}, {25, 863}, {0, 2589}, {0, 1618}, + {0, 1177}, {0, 925}, {56, 0}, {22, 0}, +}; + +const uint8_t kCdefPrimaryTaps[2][2] = {{4, 2}, {3, 3}}; + +// This is Cdef_Directions (section 7.15.3) with 2 padding entries at the +// beginning and end of the table. The cdef direction range is [0, 7] and the +// first index is offset +/-2. This removes the need to constrain the first +// index to the same range using e.g., & 7. +const int8_t kCdefDirectionsPadded[12][2][2] = { + {{1, 0}, {2, 0}}, // Padding: Cdef_Directions[6] + {{1, 0}, {2, -1}}, // Padding: Cdef_Directions[7] + {{-1, 1}, {-2, 2}}, // Begin Cdef_Directions + {{0, 1}, {-1, 2}}, // + {{0, 1}, {0, 2}}, // + {{0, 1}, {1, 2}}, // + {{1, 1}, {2, 2}}, // + {{1, 0}, {2, 1}}, // + {{1, 0}, {2, 0}}, // + {{1, 0}, {2, -1}}, // End Cdef_Directions + {{-1, 1}, {-2, 2}}, // Padding: Cdef_Directions[0] + {{0, 1}, {-1, 2}}, // Padding: Cdef_Directions[1] +}; + +} // namespace libgav1 |