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Diffstat (limited to 'src/film_grain.cc')
| -rw-r--r-- | src/film_grain.cc | 817 |
1 files changed, 817 insertions, 0 deletions
diff --git a/src/film_grain.cc b/src/film_grain.cc new file mode 100644 index 0000000..dac37b5 --- /dev/null +++ b/src/film_grain.cc @@ -0,0 +1,817 @@ +// Copyright 2020 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/film_grain.h" + +#include <algorithm> +#include <cassert> +#include <cstddef> +#include <cstdint> +#include <cstring> +#include <new> + +#include "src/dsp/common.h" +#include "src/dsp/constants.h" +#include "src/dsp/dsp.h" +#include "src/utils/array_2d.h" +#include "src/utils/blocking_counter.h" +#include "src/utils/common.h" +#include "src/utils/compiler_attributes.h" +#include "src/utils/constants.h" +#include "src/utils/logging.h" +#include "src/utils/threadpool.h" + +namespace libgav1 { + +namespace { + +// The kGaussianSequence array contains random samples from a Gaussian +// distribution with zero mean and standard deviation of about 512 clipped to +// the range of [-2048, 2047] (representable by a signed integer using 12 bits +// of precision) and rounded to the nearest multiple of 4. +// +// Note: It is important that every element in the kGaussianSequence array be +// less than 2040, so that RightShiftWithRounding(kGaussianSequence[i], 4) is +// less than 128 for bitdepth=8 (GrainType=int8_t). +constexpr int16_t kGaussianSequence[/*2048*/] = { + 56, 568, -180, 172, 124, -84, 172, -64, -900, 24, 820, + 224, 1248, 996, 272, -8, -916, -388, -732, -104, -188, 800, + 112, -652, -320, -376, 140, -252, 492, -168, 44, -788, 588, + -584, 500, -228, 12, 680, 272, -476, 972, -100, 652, 368, + 432, -196, -720, -192, 1000, -332, 652, -136, -552, -604, -4, + 192, -220, -136, 1000, -52, 372, -96, -624, 124, -24, 396, + 540, -12, -104, 640, 464, 244, -208, -84, 368, -528, -740, + 248, -968, -848, 608, 376, -60, -292, -40, -156, 252, -292, + 248, 224, -280, 400, -244, 244, -60, 76, -80, 212, 532, + 340, 128, -36, 824, -352, -60, -264, -96, -612, 416, -704, + 220, -204, 640, -160, 1220, -408, 900, 336, 20, -336, -96, + -792, 304, 48, -28, -1232, -1172, -448, 104, -292, -520, 244, + 60, -948, 0, -708, 268, 108, 356, -548, 488, -344, -136, + 488, -196, -224, 656, -236, -1128, 60, 4, 140, 276, -676, + -376, 168, -108, 464, 8, 564, 64, 240, 308, -300, -400, + -456, -136, 56, 120, -408, -116, 436, 504, -232, 328, 844, + -164, -84, 784, -168, 232, -224, 348, -376, 128, 568, 96, + -1244, -288, 276, 848, 832, -360, 656, 464, -384, -332, -356, + 728, -388, 160, -192, 468, 296, 224, 140, -776, -100, 280, + 4, 196, 44, -36, -648, 932, 16, 1428, 28, 528, 808, + 772, 20, 268, 88, -332, -284, 124, -384, -448, 208, -228, + -1044, -328, 660, 380, -148, -300, 588, 240, 540, 28, 136, + -88, -436, 256, 296, -1000, 1400, 0, -48, 1056, -136, 264, + -528, -1108, 632, -484, -592, -344, 796, 124, -668, -768, 388, + 1296, -232, -188, -200, -288, -4, 308, 100, -168, 256, -500, + 204, -508, 648, -136, 372, -272, -120, -1004, -552, -548, -384, + 548, -296, 428, -108, -8, -912, -324, -224, -88, -112, -220, + -100, 996, -796, 548, 360, -216, 180, 428, -200, -212, 148, + 96, 148, 284, 216, -412, -320, 120, -300, -384, -604, -572, + -332, -8, -180, -176, 696, 116, -88, 628, 76, 44, -516, + 240, -208, -40, 100, -592, 344, -308, -452, -228, 20, 916, + -1752, -136, -340, -804, 140, 40, 512, 340, 248, 184, -492, + 896, -156, 932, -628, 328, -688, -448, -616, -752, -100, 560, + -1020, 180, -800, -64, 76, 576, 1068, 396, 660, 552, -108, + -28, 320, -628, 312, -92, -92, -472, 268, 16, 560, 516, + -672, -52, 492, -100, 260, 384, 284, 292, 304, -148, 88, + -152, 1012, 1064, -228, 164, -376, -684, 592, -392, 156, 196, + -524, -64, -884, 160, -176, 636, 648, 404, -396, -436, 864, + 424, -728, 988, -604, 904, -592, 296, -224, 536, -176, -920, + 436, -48, 1176, -884, 416, -776, -824, -884, 524, -548, -564, + -68, -164, -96, 692, 364, -692, -1012, -68, 260, -480, 876, + -1116, 452, -332, -352, 892, -1088, 1220, -676, 12, -292, 244, + 496, 372, -32, 280, 200, 112, -440, -96, 24, -644, -184, + 56, -432, 224, -980, 272, -260, 144, -436, 420, 356, 364, + -528, 76, 172, -744, -368, 404, -752, -416, 684, -688, 72, + 540, 416, 92, 444, 480, -72, -1416, 164, -1172, -68, 24, + 424, 264, 1040, 128, -912, -524, -356, 64, 876, -12, 4, + -88, 532, 272, -524, 320, 276, -508, 940, 24, -400, -120, + 756, 60, 236, -412, 100, 376, -484, 400, -100, -740, -108, + -260, 328, -268, 224, -200, -416, 184, -604, -564, -20, 296, + 60, 892, -888, 60, 164, 68, -760, 216, -296, 904, -336, + -28, 404, -356, -568, -208, -1480, -512, 296, 328, -360, -164, + -1560, -776, 1156, -428, 164, -504, -112, 120, -216, -148, -264, + 308, 32, 64, -72, 72, 116, 176, -64, -272, 460, -536, + -784, -280, 348, 108, -752, -132, 524, -540, -776, 116, -296, + -1196, -288, -560, 1040, -472, 116, -848, -1116, 116, 636, 696, + 284, -176, 1016, 204, -864, -648, -248, 356, 972, -584, -204, + 264, 880, 528, -24, -184, 116, 448, -144, 828, 524, 212, + -212, 52, 12, 200, 268, -488, -404, -880, 824, -672, -40, + 908, -248, 500, 716, -576, 492, -576, 16, 720, -108, 384, + 124, 344, 280, 576, -500, 252, 104, -308, 196, -188, -8, + 1268, 296, 1032, -1196, 436, 316, 372, -432, -200, -660, 704, + -224, 596, -132, 268, 32, -452, 884, 104, -1008, 424, -1348, + -280, 4, -1168, 368, 476, 696, 300, -8, 24, 180, -592, + -196, 388, 304, 500, 724, -160, 244, -84, 272, -256, -420, + 320, 208, -144, -156, 156, 364, 452, 28, 540, 316, 220, + -644, -248, 464, 72, 360, 32, -388, 496, -680, -48, 208, + -116, -408, 60, -604, -392, 548, -840, 784, -460, 656, -544, + -388, -264, 908, -800, -628, -612, -568, 572, -220, 164, 288, + -16, -308, 308, -112, -636, -760, 280, -668, 432, 364, 240, + -196, 604, 340, 384, 196, 592, -44, -500, 432, -580, -132, + 636, -76, 392, 4, -412, 540, 508, 328, -356, -36, 16, + -220, -64, -248, -60, 24, -192, 368, 1040, 92, -24, -1044, + -32, 40, 104, 148, 192, -136, -520, 56, -816, -224, 732, + 392, 356, 212, -80, -424, -1008, -324, 588, -1496, 576, 460, + -816, -848, 56, -580, -92, -1372, -112, -496, 200, 364, 52, + -140, 48, -48, -60, 84, 72, 40, 132, -356, -268, -104, + -284, -404, 732, -520, 164, -304, -540, 120, 328, -76, -460, + 756, 388, 588, 236, -436, -72, -176, -404, -316, -148, 716, + -604, 404, -72, -88, -888, -68, 944, 88, -220, -344, 960, + 472, 460, -232, 704, 120, 832, -228, 692, -508, 132, -476, + 844, -748, -364, -44, 1116, -1104, -1056, 76, 428, 552, -692, + 60, 356, 96, -384, -188, -612, -576, 736, 508, 892, 352, + -1132, 504, -24, -352, 324, 332, -600, -312, 292, 508, -144, + -8, 484, 48, 284, -260, -240, 256, -100, -292, -204, -44, + 472, -204, 908, -188, -1000, -256, 92, 1164, -392, 564, 356, + 652, -28, -884, 256, 484, -192, 760, -176, 376, -524, -452, + -436, 860, -736, 212, 124, 504, -476, 468, 76, -472, 552, + -692, -944, -620, 740, -240, 400, 132, 20, 192, -196, 264, + -668, -1012, -60, 296, -316, -828, 76, -156, 284, -768, -448, + -832, 148, 248, 652, 616, 1236, 288, -328, -400, -124, 588, + 220, 520, -696, 1032, 768, -740, -92, -272, 296, 448, -464, + 412, -200, 392, 440, -200, 264, -152, -260, 320, 1032, 216, + 320, -8, -64, 156, -1016, 1084, 1172, 536, 484, -432, 132, + 372, -52, -256, 84, 116, -352, 48, 116, 304, -384, 412, + 924, -300, 528, 628, 180, 648, 44, -980, -220, 1320, 48, + 332, 748, 524, -268, -720, 540, -276, 564, -344, -208, -196, + 436, 896, 88, -392, 132, 80, -964, -288, 568, 56, -48, + -456, 888, 8, 552, -156, -292, 948, 288, 128, -716, -292, + 1192, -152, 876, 352, -600, -260, -812, -468, -28, -120, -32, + -44, 1284, 496, 192, 464, 312, -76, -516, -380, -456, -1012, + -48, 308, -156, 36, 492, -156, -808, 188, 1652, 68, -120, + -116, 316, 160, -140, 352, 808, -416, 592, 316, -480, 56, + 528, -204, -568, 372, -232, 752, -344, 744, -4, 324, -416, + -600, 768, 268, -248, -88, -132, -420, -432, 80, -288, 404, + -316, -1216, -588, 520, -108, 92, -320, 368, -480, -216, -92, + 1688, -300, 180, 1020, -176, 820, -68, -228, -260, 436, -904, + 20, 40, -508, 440, -736, 312, 332, 204, 760, -372, 728, + 96, -20, -632, -520, -560, 336, 1076, -64, -532, 776, 584, + 192, 396, -728, -520, 276, -188, 80, -52, -612, -252, -48, + 648, 212, -688, 228, -52, -260, 428, -412, -272, -404, 180, + 816, -796, 48, 152, 484, -88, -216, 988, 696, 188, -528, + 648, -116, -180, 316, 476, 12, -564, 96, 476, -252, -364, + -376, -392, 556, -256, -576, 260, -352, 120, -16, -136, -260, + -492, 72, 556, 660, 580, 616, 772, 436, 424, -32, -324, + -1268, 416, -324, -80, 920, 160, 228, 724, 32, -516, 64, + 384, 68, -128, 136, 240, 248, -204, -68, 252, -932, -120, + -480, -628, -84, 192, 852, -404, -288, -132, 204, 100, 168, + -68, -196, -868, 460, 1080, 380, -80, 244, 0, 484, -888, + 64, 184, 352, 600, 460, 164, 604, -196, 320, -64, 588, + -184, 228, 12, 372, 48, -848, -344, 224, 208, -200, 484, + 128, -20, 272, -468, -840, 384, 256, -720, -520, -464, -580, + 112, -120, 644, -356, -208, -608, -528, 704, 560, -424, 392, + 828, 40, 84, 200, -152, 0, -144, 584, 280, -120, 80, + -556, -972, -196, -472, 724, 80, 168, -32, 88, 160, -688, + 0, 160, 356, 372, -776, 740, -128, 676, -248, -480, 4, + -364, 96, 544, 232, -1032, 956, 236, 356, 20, -40, 300, + 24, -676, -596, 132, 1120, -104, 532, -1096, 568, 648, 444, + 508, 380, 188, -376, -604, 1488, 424, 24, 756, -220, -192, + 716, 120, 920, 688, 168, 44, -460, 568, 284, 1144, 1160, + 600, 424, 888, 656, -356, -320, 220, 316, -176, -724, -188, + -816, -628, -348, -228, -380, 1012, -452, -660, 736, 928, 404, + -696, -72, -268, -892, 128, 184, -344, -780, 360, 336, 400, + 344, 428, 548, -112, 136, -228, -216, -820, -516, 340, 92, + -136, 116, -300, 376, -244, 100, -316, -520, -284, -12, 824, + 164, -548, -180, -128, 116, -924, -828, 268, -368, -580, 620, + 192, 160, 0, -1676, 1068, 424, -56, -360, 468, -156, 720, + 288, -528, 556, -364, 548, -148, 504, 316, 152, -648, -620, + -684, -24, -376, -384, -108, -920, -1032, 768, 180, -264, -508, + -1268, -260, -60, 300, -240, 988, 724, -376, -576, -212, -736, + 556, 192, 1092, -620, -880, 376, -56, -4, -216, -32, 836, + 268, 396, 1332, 864, -600, 100, 56, -412, -92, 356, 180, + 884, -468, -436, 292, -388, -804, -704, -840, 368, -348, 140, + -724, 1536, 940, 372, 112, -372, 436, -480, 1136, 296, -32, + -228, 132, -48, -220, 868, -1016, -60, -1044, -464, 328, 916, + 244, 12, -736, -296, 360, 468, -376, -108, -92, 788, 368, + -56, 544, 400, -672, -420, 728, 16, 320, 44, -284, -380, + -796, 488, 132, 204, -596, -372, 88, -152, -908, -636, -572, + -624, -116, -692, -200, -56, 276, -88, 484, -324, 948, 864, + 1000, -456, -184, -276, 292, -296, 156, 676, 320, 160, 908, + -84, -1236, -288, -116, 260, -372, -644, 732, -756, -96, 84, + 344, -520, 348, -688, 240, -84, 216, -1044, -136, -676, -396, + -1500, 960, -40, 176, 168, 1516, 420, -504, -344, -364, -360, + 1216, -940, -380, -212, 252, -660, -708, 484, -444, -152, 928, + -120, 1112, 476, -260, 560, -148, -344, 108, -196, 228, -288, + 504, 560, -328, -88, 288, -1008, 460, -228, 468, -836, -196, + 76, 388, 232, 412, -1168, -716, -644, 756, -172, -356, -504, + 116, 432, 528, 48, 476, -168, -608, 448, 160, -532, -272, + 28, -676, -12, 828, 980, 456, 520, 104, -104, 256, -344, + -4, -28, -368, -52, -524, -572, -556, -200, 768, 1124, -208, + -512, 176, 232, 248, -148, -888, 604, -600, -304, 804, -156, + -212, 488, -192, -804, -256, 368, -360, -916, -328, 228, -240, + -448, -472, 856, -556, -364, 572, -12, -156, -368, -340, 432, + 252, -752, -152, 288, 268, -580, -848, -592, 108, -76, 244, + 312, -716, 592, -80, 436, 360, 4, -248, 160, 516, 584, + 732, 44, -468, -280, -292, -156, -588, 28, 308, 912, 24, + 124, 156, 180, -252, 944, -924, -772, -520, -428, -624, 300, + -212, -1144, 32, -724, 800, -1128, -212, -1288, -848, 180, -416, + 440, 192, -576, -792, -76, -1080, 80, -532, -352, -132, 380, + -820, 148, 1112, 128, 164, 456, 700, -924, 144, -668, -384, + 648, -832, 508, 552, -52, -100, -656, 208, -568, 748, -88, + 680, 232, 300, 192, -408, -1012, -152, -252, -268, 272, -876, + -664, -648, -332, -136, 16, 12, 1152, -28, 332, -536, 320, + -672, -460, -316, 532, -260, 228, -40, 1052, -816, 180, 88, + -496, -556, -672, -368, 428, 92, 356, 404, -408, 252, 196, + -176, -556, 792, 268, 32, 372, 40, 96, -332, 328, 120, + 372, -900, -40, 472, -264, -592, 952, 128, 656, 112, 664, + -232, 420, 4, -344, -464, 556, 244, -416, -32, 252, 0, + -412, 188, -696, 508, -476, 324, -1096, 656, -312, 560, 264, + -136, 304, 160, -64, -580, 248, 336, -720, 560, -348, -288, + -276, -196, -500, 852, -544, -236, -1128, -992, -776, 116, 56, + 52, 860, 884, 212, -12, 168, 1020, 512, -552, 924, -148, + 716, 188, 164, -340, -520, -184, 880, -152, -680, -208, -1156, + -300, -528, -472, 364, 100, -744, -1056, -32, 540, 280, 144, + -676, -32, -232, -280, -224, 96, 568, -76, 172, 148, 148, + 104, 32, -296, -32, 788, -80, 32, -16, 280, 288, 944, + 428, -484}; +static_assert(sizeof(kGaussianSequence) / sizeof(kGaussianSequence[0]) == 2048, + ""); + +// The number of rows in a contiguous group computed by a single worker thread +// before checking for the next available group. +constexpr int kFrameChunkHeight = 8; + +// |width| and |height| refer to the plane, not the frame, meaning any +// subsampling should be applied by the caller. +template <typename Pixel> +inline void CopyImagePlane(const uint8_t* source_plane, ptrdiff_t source_stride, + int width, int height, uint8_t* dest_plane, + ptrdiff_t dest_stride) { + // If it's the same buffer there's nothing to do. + if (source_plane == dest_plane) return; + + int y = 0; + do { + memcpy(dest_plane, source_plane, width * sizeof(Pixel)); + source_plane += source_stride; + dest_plane += dest_stride; + } while (++y < height); +} + +} // namespace + +template <int bitdepth> +FilmGrain<bitdepth>::FilmGrain(const FilmGrainParams& params, + bool is_monochrome, + bool color_matrix_is_identity, int subsampling_x, + int subsampling_y, int width, int height, + ThreadPool* thread_pool) + : params_(params), + is_monochrome_(is_monochrome), + color_matrix_is_identity_(color_matrix_is_identity), + subsampling_x_(subsampling_x), + subsampling_y_(subsampling_y), + width_(width), + height_(height), + template_uv_width_((subsampling_x != 0) ? kMinChromaWidth + : kMaxChromaWidth), + template_uv_height_((subsampling_y != 0) ? kMinChromaHeight + : kMaxChromaHeight), + thread_pool_(thread_pool) {} + +template <int bitdepth> +bool FilmGrain<bitdepth>::Init() { + // Section 7.18.3.3. Generate grain process. + const dsp::Dsp& dsp = *dsp::GetDspTable(bitdepth); + // If params_.num_y_points is 0, luma_grain_ will never be read, so we don't + // need to generate it. + const bool use_luma = params_.num_y_points > 0; + if (use_luma) { + GenerateLumaGrain(params_, luma_grain_); + // If params_.auto_regression_coeff_lag is 0, the filter is the identity + // filter and therefore can be skipped. + if (params_.auto_regression_coeff_lag > 0) { + dsp.film_grain + .luma_auto_regression[params_.auto_regression_coeff_lag - 1]( + params_, luma_grain_); + } + } else { + // Have AddressSanitizer warn if luma_grain_ is used. + ASAN_POISON_MEMORY_REGION(luma_grain_, sizeof(luma_grain_)); + } + if (!is_monochrome_) { + GenerateChromaGrains(params_, template_uv_width_, template_uv_height_, + u_grain_, v_grain_); + if (params_.auto_regression_coeff_lag > 0 || use_luma) { + dsp.film_grain.chroma_auto_regression[static_cast<int>( + use_luma)][params_.auto_regression_coeff_lag]( + params_, luma_grain_, subsampling_x_, subsampling_y_, u_grain_, + v_grain_); + } + } + + // Section 7.18.3.4. Scaling lookup initialization process. + + // Initialize scaling_lut_y_. If params_.num_y_points > 0, scaling_lut_y_ + // is used for the Y plane. If params_.chroma_scaling_from_luma is true, + // scaling_lut_u_ and scaling_lut_v_ are the same as scaling_lut_y_ and are + // set up as aliases. So we need to initialize scaling_lut_y_ under these + // two conditions. + // + // Note: Although it does not seem to make sense, there are test vectors + // with chroma_scaling_from_luma=true and params_.num_y_points=0. + if (use_luma || params_.chroma_scaling_from_luma) { + dsp.film_grain.initialize_scaling_lut( + params_.num_y_points, params_.point_y_value, params_.point_y_scaling, + scaling_lut_y_); + } else { + ASAN_POISON_MEMORY_REGION(scaling_lut_y_, sizeof(scaling_lut_y_)); + } + if (!is_monochrome_) { + if (params_.chroma_scaling_from_luma) { + scaling_lut_u_ = scaling_lut_y_; + scaling_lut_v_ = scaling_lut_y_; + } else if (params_.num_u_points > 0 || params_.num_v_points > 0) { + const size_t buffer_size = + (kScalingLookupTableSize + kScalingLookupTablePadding) * + (static_cast<int>(params_.num_u_points > 0) + + static_cast<int>(params_.num_v_points > 0)); + scaling_lut_chroma_buffer_.reset(new (std::nothrow) uint8_t[buffer_size]); + if (scaling_lut_chroma_buffer_ == nullptr) return false; + + uint8_t* buffer = scaling_lut_chroma_buffer_.get(); + if (params_.num_u_points > 0) { + scaling_lut_u_ = buffer; + dsp.film_grain.initialize_scaling_lut( + params_.num_u_points, params_.point_u_value, + params_.point_u_scaling, scaling_lut_u_); + buffer += kScalingLookupTableSize + kScalingLookupTablePadding; + } + if (params_.num_v_points > 0) { + scaling_lut_v_ = buffer; + dsp.film_grain.initialize_scaling_lut( + params_.num_v_points, params_.point_v_value, + params_.point_v_scaling, scaling_lut_v_); + } + } + } + return true; +} + +template <int bitdepth> +void FilmGrain<bitdepth>::GenerateLumaGrain(const FilmGrainParams& params, + GrainType* luma_grain) { + // If params.num_y_points is equal to 0, Section 7.18.3.3 specifies we set + // the luma_grain array to all zeros. But the Note at the end of Section + // 7.18.3.3 says luma_grain "will never be read in this case". So we don't + // call GenerateLumaGrain if params.num_y_points is equal to 0. + assert(params.num_y_points > 0); + const int shift = 12 - bitdepth + params.grain_scale_shift; + uint16_t seed = params.grain_seed; + GrainType* luma_grain_row = luma_grain; + for (int y = 0; y < kLumaHeight; ++y) { + for (int x = 0; x < kLumaWidth; ++x) { + luma_grain_row[x] = RightShiftWithRounding( + kGaussianSequence[GetFilmGrainRandomNumber(11, &seed)], shift); + } + luma_grain_row += kLumaWidth; + } +} + +template <int bitdepth> +void FilmGrain<bitdepth>::GenerateChromaGrains(const FilmGrainParams& params, + int chroma_width, + int chroma_height, + GrainType* u_grain, + GrainType* v_grain) { + const int shift = 12 - bitdepth + params.grain_scale_shift; + if (params.num_u_points == 0 && !params.chroma_scaling_from_luma) { + memset(u_grain, 0, chroma_height * chroma_width * sizeof(*u_grain)); + } else { + uint16_t seed = params.grain_seed ^ 0xb524; + GrainType* u_grain_row = u_grain; + assert(chroma_width > 0); + assert(chroma_height > 0); + int y = 0; + do { + int x = 0; + do { + u_grain_row[x] = RightShiftWithRounding( + kGaussianSequence[GetFilmGrainRandomNumber(11, &seed)], shift); + } while (++x < chroma_width); + + u_grain_row += chroma_width; + } while (++y < chroma_height); + } + if (params.num_v_points == 0 && !params.chroma_scaling_from_luma) { + memset(v_grain, 0, chroma_height * chroma_width * sizeof(*v_grain)); + } else { + GrainType* v_grain_row = v_grain; + uint16_t seed = params.grain_seed ^ 0x49d8; + int y = 0; + do { + int x = 0; + do { + v_grain_row[x] = RightShiftWithRounding( + kGaussianSequence[GetFilmGrainRandomNumber(11, &seed)], shift); + } while (++x < chroma_width); + + v_grain_row += chroma_width; + } while (++y < chroma_height); + } +} + +template <int bitdepth> +bool FilmGrain<bitdepth>::AllocateNoiseStripes() { + const int half_height = DivideBy2(height_ + 1); + assert(half_height > 0); + // ceil(half_height / 16.0) + const int max_luma_num = DivideBy16(half_height + 15); + constexpr int kNoiseStripeHeight = 34; + size_t noise_buffer_size = kNoiseStripePadding; + if (params_.num_y_points > 0) { + noise_buffer_size += max_luma_num * kNoiseStripeHeight * width_; + } + if (!is_monochrome_) { + noise_buffer_size += 2 * max_luma_num * + (kNoiseStripeHeight >> subsampling_y_) * + SubsampledValue(width_, subsampling_x_); + } + noise_buffer_.reset(new (std::nothrow) GrainType[noise_buffer_size]); + if (noise_buffer_ == nullptr) return false; + GrainType* noise_buffer = noise_buffer_.get(); + if (params_.num_y_points > 0) { + noise_stripes_[kPlaneY].Reset(max_luma_num, kNoiseStripeHeight * width_, + noise_buffer); + noise_buffer += max_luma_num * kNoiseStripeHeight * width_; + } + if (!is_monochrome_) { + noise_stripes_[kPlaneU].Reset(max_luma_num, + (kNoiseStripeHeight >> subsampling_y_) * + SubsampledValue(width_, subsampling_x_), + noise_buffer); + noise_buffer += max_luma_num * (kNoiseStripeHeight >> subsampling_y_) * + SubsampledValue(width_, subsampling_x_); + noise_stripes_[kPlaneV].Reset(max_luma_num, + (kNoiseStripeHeight >> subsampling_y_) * + SubsampledValue(width_, subsampling_x_), + noise_buffer); + } + return true; +} + +template <int bitdepth> +bool FilmGrain<bitdepth>::AllocateNoiseImage() { + if (params_.num_y_points > 0 && + !noise_image_[kPlaneY].Reset(height_, width_ + kNoiseImagePadding, + /*zero_initialize=*/false)) { + return false; + } + if (!is_monochrome_) { + if (!noise_image_[kPlaneU].Reset( + (height_ + subsampling_y_) >> subsampling_y_, + ((width_ + subsampling_x_) >> subsampling_x_) + kNoiseImagePadding, + /*zero_initialize=*/false)) { + return false; + } + if (!noise_image_[kPlaneV].Reset( + (height_ + subsampling_y_) >> subsampling_y_, + ((width_ + subsampling_x_) >> subsampling_x_) + kNoiseImagePadding, + /*zero_initialize=*/false)) { + return false; + } + } + return true; +} + +// Uses |overlap_flag| to skip rows that are covered by the overlap computation. +template <int bitdepth> +void FilmGrain<bitdepth>::ConstructNoiseImage( + const Array2DView<GrainType>* noise_stripes, int width, int height, + int subsampling_x, int subsampling_y, int stripe_start_offset, + Array2D<GrainType>* noise_image) { + const int plane_width = (width + subsampling_x) >> subsampling_x; + const int plane_height = (height + subsampling_y) >> subsampling_y; + const int stripe_height = 32 >> subsampling_y; + const int stripe_mask = stripe_height - 1; + int y = 0; + // |luma_num| = y >> (5 - |subsampling_y|). Hence |luma_num| == 0 for all y up + // to either 16 or 32. + const GrainType* first_noise_stripe = (*noise_stripes)[0]; + do { + memcpy((*noise_image)[y], first_noise_stripe + y * plane_width, + plane_width * sizeof(first_noise_stripe[0])); + } while (++y < std::min(stripe_height, plane_height)); + // End special iterations for luma_num == 0. + + int luma_num = 1; + for (; y < (plane_height & ~stripe_mask); ++luma_num, y += stripe_height) { + const GrainType* noise_stripe = (*noise_stripes)[luma_num]; + int i = stripe_start_offset; + do { + memcpy((*noise_image)[y + i], noise_stripe + i * plane_width, + plane_width * sizeof(noise_stripe[0])); + } while (++i < stripe_height); + } + + // If there is a partial stripe, copy any rows beyond the overlap rows. + const int remaining_height = plane_height - y; + if (remaining_height > stripe_start_offset) { + assert(luma_num < noise_stripes->rows()); + const GrainType* noise_stripe = (*noise_stripes)[luma_num]; + int i = stripe_start_offset; + do { + memcpy((*noise_image)[y + i], noise_stripe + i * plane_width, + plane_width * sizeof(noise_stripe[0])); + } while (++i < remaining_height); + } +} + +template <int bitdepth> +void FilmGrain<bitdepth>::BlendNoiseChromaWorker( + const dsp::Dsp& dsp, const Plane* planes, int num_planes, + std::atomic<int>* job_counter, int min_value, int max_chroma, + const uint8_t* source_plane_y, ptrdiff_t source_stride_y, + const uint8_t* source_plane_u, const uint8_t* source_plane_v, + ptrdiff_t source_stride_uv, uint8_t* dest_plane_u, uint8_t* dest_plane_v, + ptrdiff_t dest_stride_uv) { + assert(num_planes > 0); + const int full_jobs_per_plane = height_ / kFrameChunkHeight; + const int remainder_job_height = height_ & (kFrameChunkHeight - 1); + const int total_full_jobs = full_jobs_per_plane * num_planes; + // If the frame height is not a multiple of kFrameChunkHeight, one job with + // a smaller number of rows is necessary at the end of each plane. + const int total_jobs = + total_full_jobs + ((remainder_job_height == 0) ? 0 : num_planes); + int job_index; + // Each job corresponds to a slice of kFrameChunkHeight rows in the luma + // plane. dsp->blend_noise_chroma handles subsampling. + // This loop body handles a slice of one plane or the other, depending on + // which are active. That way, threads working on consecutive jobs will keep + // the same region of luma source in working memory. + while ((job_index = job_counter->fetch_add(1, std::memory_order_relaxed)) < + total_jobs) { + const Plane plane = planes[job_index % num_planes]; + const int slice_index = job_index / num_planes; + const int start_height = slice_index * kFrameChunkHeight; + const int job_height = std::min(height_ - start_height, kFrameChunkHeight); + + const auto* source_cursor_y = reinterpret_cast<const Pixel*>( + source_plane_y + start_height * source_stride_y); + const uint8_t* scaling_lut_uv; + const uint8_t* source_plane_uv; + uint8_t* dest_plane_uv; + + if (plane == kPlaneU) { + scaling_lut_uv = scaling_lut_u_; + source_plane_uv = source_plane_u; + dest_plane_uv = dest_plane_u; + } else { + assert(plane == kPlaneV); + scaling_lut_uv = scaling_lut_v_; + source_plane_uv = source_plane_v; + dest_plane_uv = dest_plane_v; + } + const auto* source_cursor_uv = reinterpret_cast<const Pixel*>( + source_plane_uv + (start_height >> subsampling_y_) * source_stride_uv); + auto* dest_cursor_uv = reinterpret_cast<Pixel*>( + dest_plane_uv + (start_height >> subsampling_y_) * dest_stride_uv); + dsp.film_grain.blend_noise_chroma[params_.chroma_scaling_from_luma]( + plane, params_, noise_image_, min_value, max_chroma, width_, job_height, + start_height, subsampling_x_, subsampling_y_, scaling_lut_uv, + source_cursor_y, source_stride_y, source_cursor_uv, source_stride_uv, + dest_cursor_uv, dest_stride_uv); + } +} + +template <int bitdepth> +void FilmGrain<bitdepth>::BlendNoiseLumaWorker( + const dsp::Dsp& dsp, std::atomic<int>* job_counter, int min_value, + int max_luma, const uint8_t* source_plane_y, ptrdiff_t source_stride_y, + uint8_t* dest_plane_y, ptrdiff_t dest_stride_y) { + const int total_full_jobs = height_ / kFrameChunkHeight; + const int remainder_job_height = height_ & (kFrameChunkHeight - 1); + const int total_jobs = + total_full_jobs + static_cast<int>(remainder_job_height > 0); + int job_index; + // Each job is some number of rows in a plane. + while ((job_index = job_counter->fetch_add(1, std::memory_order_relaxed)) < + total_jobs) { + const int start_height = job_index * kFrameChunkHeight; + const int job_height = std::min(height_ - start_height, kFrameChunkHeight); + + const auto* source_cursor_y = reinterpret_cast<const Pixel*>( + source_plane_y + start_height * source_stride_y); + auto* dest_cursor_y = + reinterpret_cast<Pixel*>(dest_plane_y + start_height * dest_stride_y); + dsp.film_grain.blend_noise_luma( + noise_image_, min_value, max_luma, params_.chroma_scaling, width_, + job_height, start_height, scaling_lut_y_, source_cursor_y, + source_stride_y, dest_cursor_y, dest_stride_y); + } +} + +template <int bitdepth> +bool FilmGrain<bitdepth>::AddNoise( + const uint8_t* source_plane_y, ptrdiff_t source_stride_y, + const uint8_t* source_plane_u, const uint8_t* source_plane_v, + ptrdiff_t source_stride_uv, uint8_t* dest_plane_y, ptrdiff_t dest_stride_y, + uint8_t* dest_plane_u, uint8_t* dest_plane_v, ptrdiff_t dest_stride_uv) { + if (!Init()) { + LIBGAV1_DLOG(ERROR, "Init() failed."); + return false; + } + if (!AllocateNoiseStripes()) { + LIBGAV1_DLOG(ERROR, "AllocateNoiseStripes() failed."); + return false; + } + + const dsp::Dsp& dsp = *dsp::GetDspTable(bitdepth); + const bool use_luma = params_.num_y_points > 0; + + // Construct noise stripes. + if (use_luma) { + // The luma plane is never subsampled. + dsp.film_grain + .construct_noise_stripes[static_cast<int>(params_.overlap_flag)]( + luma_grain_, params_.grain_seed, width_, height_, + /*subsampling_x=*/0, /*subsampling_y=*/0, &noise_stripes_[kPlaneY]); + } + if (!is_monochrome_) { + dsp.film_grain + .construct_noise_stripes[static_cast<int>(params_.overlap_flag)]( + u_grain_, params_.grain_seed, width_, height_, subsampling_x_, + subsampling_y_, &noise_stripes_[kPlaneU]); + dsp.film_grain + .construct_noise_stripes[static_cast<int>(params_.overlap_flag)]( + v_grain_, params_.grain_seed, width_, height_, subsampling_x_, + subsampling_y_, &noise_stripes_[kPlaneV]); + } + + if (!AllocateNoiseImage()) { + LIBGAV1_DLOG(ERROR, "AllocateNoiseImage() failed."); + return false; + } + + // Construct noise image. + if (use_luma) { + ConstructNoiseImage( + &noise_stripes_[kPlaneY], width_, height_, /*subsampling_x=*/0, + /*subsampling_y=*/0, static_cast<int>(params_.overlap_flag) << 1, + &noise_image_[kPlaneY]); + if (params_.overlap_flag) { + dsp.film_grain.construct_noise_image_overlap( + &noise_stripes_[kPlaneY], width_, height_, /*subsampling_x=*/0, + /*subsampling_y=*/0, &noise_image_[kPlaneY]); + } + } + if (!is_monochrome_) { + ConstructNoiseImage(&noise_stripes_[kPlaneU], width_, height_, + subsampling_x_, subsampling_y_, + static_cast<int>(params_.overlap_flag) + << (1 - subsampling_y_), + &noise_image_[kPlaneU]); + ConstructNoiseImage(&noise_stripes_[kPlaneV], width_, height_, + subsampling_x_, subsampling_y_, + static_cast<int>(params_.overlap_flag) + << (1 - subsampling_y_), + &noise_image_[kPlaneV]); + if (params_.overlap_flag) { + dsp.film_grain.construct_noise_image_overlap( + &noise_stripes_[kPlaneU], width_, height_, subsampling_x_, + subsampling_y_, &noise_image_[kPlaneU]); + dsp.film_grain.construct_noise_image_overlap( + &noise_stripes_[kPlaneV], width_, height_, subsampling_x_, + subsampling_y_, &noise_image_[kPlaneV]); + } + } + + // Blend noise image. + int min_value; + int max_luma; + int max_chroma; + if (params_.clip_to_restricted_range) { + min_value = 16 << (bitdepth - 8); + max_luma = 235 << (bitdepth - 8); + if (color_matrix_is_identity_) { + max_chroma = max_luma; + } else { + max_chroma = 240 << (bitdepth - 8); + } + } else { + min_value = 0; + max_luma = (256 << (bitdepth - 8)) - 1; + max_chroma = max_luma; + } + + // Handle all chroma planes first because luma source may be altered in place. + if (!is_monochrome_) { + // This is done in a strange way but Vector can't be passed by copy to the + // lambda capture that spawns the thread. + Plane planes_to_blend[2]; + int num_planes = 0; + if (params_.chroma_scaling_from_luma) { + // Both noise planes are computed from the luma scaling lookup table. + planes_to_blend[num_planes++] = kPlaneU; + planes_to_blend[num_planes++] = kPlaneV; + } else { + const int height_uv = SubsampledValue(height_, subsampling_y_); + const int width_uv = SubsampledValue(width_, subsampling_x_); + + // Noise is applied according to a lookup table defined by pieceiwse + // linear "points." If the lookup table is empty, that corresponds to + // outputting zero noise. + if (params_.num_u_points == 0) { + CopyImagePlane<Pixel>(source_plane_u, source_stride_uv, width_uv, + height_uv, dest_plane_u, dest_stride_uv); + } else { + planes_to_blend[num_planes++] = kPlaneU; + } + if (params_.num_v_points == 0) { + CopyImagePlane<Pixel>(source_plane_v, source_stride_uv, width_uv, + height_uv, dest_plane_v, dest_stride_uv); + } else { + planes_to_blend[num_planes++] = kPlaneV; + } + } + if (thread_pool_ != nullptr && num_planes > 0) { + const int num_workers = thread_pool_->num_threads(); + BlockingCounter pending_workers(num_workers); + std::atomic<int> job_counter(0); + for (int i = 0; i < num_workers; ++i) { + thread_pool_->Schedule([this, dsp, &pending_workers, &planes_to_blend, + num_planes, &job_counter, min_value, max_chroma, + source_plane_y, source_stride_y, source_plane_u, + source_plane_v, source_stride_uv, dest_plane_u, + dest_plane_v, dest_stride_uv]() { + BlendNoiseChromaWorker(dsp, planes_to_blend, num_planes, &job_counter, + min_value, max_chroma, source_plane_y, + source_stride_y, source_plane_u, + source_plane_v, source_stride_uv, dest_plane_u, + dest_plane_v, dest_stride_uv); + pending_workers.Decrement(); + }); + } + BlendNoiseChromaWorker( + dsp, planes_to_blend, num_planes, &job_counter, min_value, max_chroma, + source_plane_y, source_stride_y, source_plane_u, source_plane_v, + source_stride_uv, dest_plane_u, dest_plane_v, dest_stride_uv); + + pending_workers.Wait(); + } else { + // Single threaded. + if (params_.num_u_points > 0 || params_.chroma_scaling_from_luma) { + dsp.film_grain.blend_noise_chroma[params_.chroma_scaling_from_luma]( + kPlaneU, params_, noise_image_, min_value, max_chroma, width_, + height_, /*start_height=*/0, subsampling_x_, subsampling_y_, + scaling_lut_u_, source_plane_y, source_stride_y, source_plane_u, + source_stride_uv, dest_plane_u, dest_stride_uv); + } + if (params_.num_v_points > 0 || params_.chroma_scaling_from_luma) { + dsp.film_grain.blend_noise_chroma[params_.chroma_scaling_from_luma]( + kPlaneV, params_, noise_image_, min_value, max_chroma, width_, + height_, /*start_height=*/0, subsampling_x_, subsampling_y_, + scaling_lut_v_, source_plane_y, source_stride_y, source_plane_v, + source_stride_uv, dest_plane_v, dest_stride_uv); + } + } + } + if (use_luma) { + if (thread_pool_ != nullptr) { + const int num_workers = thread_pool_->num_threads(); + BlockingCounter pending_workers(num_workers); + std::atomic<int> job_counter(0); + for (int i = 0; i < num_workers; ++i) { + thread_pool_->Schedule( + [this, dsp, &pending_workers, &job_counter, min_value, max_luma, + source_plane_y, source_stride_y, dest_plane_y, dest_stride_y]() { + BlendNoiseLumaWorker(dsp, &job_counter, min_value, max_luma, + source_plane_y, source_stride_y, + dest_plane_y, dest_stride_y); + pending_workers.Decrement(); + }); + } + + BlendNoiseLumaWorker(dsp, &job_counter, min_value, max_luma, + source_plane_y, source_stride_y, dest_plane_y, + dest_stride_y); + pending_workers.Wait(); + } else { + dsp.film_grain.blend_noise_luma( + noise_image_, min_value, max_luma, params_.chroma_scaling, width_, + height_, /*start_height=*/0, scaling_lut_y_, source_plane_y, + source_stride_y, dest_plane_y, dest_stride_y); + } + } else { + CopyImagePlane<Pixel>(source_plane_y, source_stride_y, width_, height_, + dest_plane_y, dest_stride_y); + } + + return true; +} + +// Explicit instantiations. +template class FilmGrain<8>; +#if LIBGAV1_MAX_BITDEPTH >= 10 +template class FilmGrain<10>; +#endif + +} // namespace libgav1 |