Split out film grain block functions into a DSPContext

1 files changed, 176 insertions, 0 deletions

diff --git a/src/fg_apply_tmpl.c b/src/fg_apply_tmpl.c
new file mode 100644
index 0000000..66cd498
--- /dev/null
+++ b/src/fg_apply_tmpl.c
@@ -0,0 +1,176 @@
+/*
+ * Copyright © 2018, Niklas Haas
+ * Copyright © 2018, VideoLAN and dav1d authors
+ * Copyright © 2018, Two Orioles, LLC
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#include <stdint.h>
+
+#include "dav1d/picture.h"
+
+#include "common.h"
+#include "common/intops.h"
+#include "common/bitdepth.h"
+
+#include "fg_apply.h"
+
+static void generate_scaling(const int bitdepth,
+                             const uint8_t points[][2], const int num,
+                             uint8_t scaling[SCALING_SIZE])
+{
+    const int shift_x = bitdepth - 8;
+    const int scaling_size = 1 << bitdepth;
+    const int pad = 1 << shift_x;
+
+    // Fill up the preceding entries with the initial value
+    for (int i = 0; i < points[0][0] << shift_x; i++)
+        scaling[i] = points[0][1];
+
+    // Linearly interpolate the values in the middle
+    for (int i = 0; i < num - 1; i++) {
+        const int bx = points[i][0];
+        const int by = points[i][1];
+        const int ex = points[i+1][0];
+        const int ey = points[i+1][1];
+        const int dx = ex - bx;
+        const int dy = ey - by;
+        const int delta = dy * ((0x10000 + (dx >> 1)) / dx);
+        for (int x = 0; x < dx; x++) {
+            const int v = by + ((x * delta + 0x8000) >> 16);
+            scaling[(bx + x) << shift_x] = v;
+        }
+    }
+
+    // Fill up the remaining entries with the final value
+    for (int i = points[num - 1][0] << shift_x; i < scaling_size; i++)
+        scaling[i] = points[num - 1][1];
+
+    if (pad <= 1) return;
+
+    const int rnd = pad >> 1;
+    for (int i = 0; i < num - 1; i++) {
+        const int bx = points[i][0] << shift_x;
+        const int ex = points[i+1][0] << shift_x;
+        const int dx = ex - bx;
+        for (int x = 0; x < dx; x += pad) {
+            const int range = scaling[bx + x + pad] - scaling[bx + x];
+            for (int n = 1; n < pad; n++) {
+                scaling[bx + x + n] = scaling[bx + x] + ((range * n + rnd) >> shift_x);
+            }
+        }
+    }
+}
+
+#ifndef UNIT_TEST
+void bitfn(dav1d_apply_grain)(const Dav1dFilmGrainDSPContext *const dsp,
+                              Dav1dPicture *const out,
+                              const Dav1dPicture *const in)
+{
+    const Dav1dFilmGrainData *const data = &out->frame_hdr->film_grain.data;
+
+    entry grain_lut[3][GRAIN_HEIGHT][GRAIN_WIDTH];
+    uint8_t scaling[3][SCALING_SIZE];
+#if BITDEPTH != 8
+    const int bitdepth_max = (1 << out->p.bpc) - 1;
+#endif
+
+    // Generate grain LUTs as needed
+    dsp->generate_grain_y(grain_lut[0], data HIGHBD_TAIL_SUFFIX); // always needed
+    if (data->num_uv_points[0] || data->chroma_scaling_from_luma)
+        dsp->generate_grain_uv[in->p.layout - 1](grain_lut[1], grain_lut[0],
+                                                 data, 0 HIGHBD_TAIL_SUFFIX);
+    if (data->num_uv_points[1] || data->chroma_scaling_from_luma)
+        dsp->generate_grain_uv[in->p.layout - 1](grain_lut[2], grain_lut[0],
+                                                 data, 1 HIGHBD_TAIL_SUFFIX);
+
+    // Generate scaling LUTs as needed
+    if (data->num_y_points)
+        generate_scaling(in->p.bpc, data->y_points, data->num_y_points, scaling[0]);
+    if (data->num_uv_points[0])
+        generate_scaling(in->p.bpc, data->uv_points[0], data->num_uv_points[0], scaling[1]);
+    if (data->num_uv_points[1])
+        generate_scaling(in->p.bpc, data->uv_points[1], data->num_uv_points[1], scaling[2]);
+
+    // Copy over the non-modified planes
+    // TODO: eliminate in favor of per-plane refs
+    assert(out->stride[0] == in->stride[0]);
+    if (!data->num_y_points) {
+        memcpy(out->data[0], in->data[0], out->p.h * out->stride[0]);
+    }
+
+    if (in->p.layout != DAV1D_PIXEL_LAYOUT_I400) {
+        assert(out->stride[1] == in->stride[1]);
+        for (int i = 0; i < 2; i++) {
+            if (!data->num_uv_points[i] && !data->chroma_scaling_from_luma) {
+                const int suby = in->p.layout == DAV1D_PIXEL_LAYOUT_I420;
+                memcpy(out->data[1+i], in->data[1+i],
+                       (out->p.h >> suby) * out->stride[1]);
+            }
+        }
+    }
+
+    // Synthesize grain for the affected planes
+    const int rows = (out->p.h + 31) >> 5;
+    const int ss_y = in->p.layout == DAV1D_PIXEL_LAYOUT_I420;
+    const int is_id = out->seq_hdr->mtrx == DAV1D_MC_IDENTITY;
+    for (int row = 0; row < rows; row++) {
+        const pixel *const luma_src =
+            ((pixel *) in->data[0]) + row * BLOCK_SIZE * PXSTRIDE(in->stride[0]);
+
+        if (data->num_y_points) {
+            const int bh = imin(out->p.h - row * BLOCK_SIZE, BLOCK_SIZE);
+            dsp->fgy_32x32xn(((pixel *) out->data[0]) + row * BLOCK_SIZE * PXSTRIDE(out->stride[0]),
+                             luma_src, out->stride[0], &out->frame_hdr->film_grain.data,
+                             out->p.w, scaling[0], grain_lut[0], bh, row HIGHBD_TAIL_SUFFIX);
+        }
+
+        const int bh = (imin(out->p.h - row * BLOCK_SIZE, BLOCK_SIZE) + ss_y) >> ss_y;
+        const ptrdiff_t uv_off = row * BLOCK_SIZE * PXSTRIDE(out->stride[1]) >> ss_y;
+        if (data->chroma_scaling_from_luma) {
+            for (int pl = 0; pl < 2; pl++)
+                dsp->fguv_32x32xn[in->p.layout - 1](((pixel *) out->data[1 + pl]) + uv_off,
+                                                    ((const pixel *) in->data[1 + pl]) + uv_off,
+                                                    in->stride[1], luma_src,
+                                                    in->stride[0], out->p.w, bh,
+                                                    &out->frame_hdr->film_grain.data,
+                                                    grain_lut[1 + pl], scaling[0],
+                                                    pl, row, is_id HIGHBD_TAIL_SUFFIX);
+        } else {
+            for (int pl = 0; pl < 2; pl++)
+                if (data->num_uv_points[pl])
+                    dsp->fguv_32x32xn[in->p.layout - 1](((pixel *) out->data[1 + pl]) + uv_off,
+                                                        ((const pixel *) in->data[1 + pl]) + uv_off,
+                                                        in->stride[1], luma_src,
+                                                        in->stride[0], out->p.w, bh,
+                                                        &out->frame_hdr->film_grain.data,
+                                                        grain_lut[1 + pl],
+                                                        scaling[1 + pl], pl, row, is_id
+                                                        HIGHBD_TAIL_SUFFIX);
+        }
+    }
+}
+#endif