avcodec/vvc: Rename vvc_?foo->foo

A namespace is unnecessary here given that all these files
are already in the vvc subfolder.

Reviewed-by: Nuo Mi <nuomi2021@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

1 files changed, 1015 insertions, 0 deletions

diff --git a/libavcodec/vvc/intra_template.c b/libavcodec/vvc/intra_template.c
new file mode 100644
index 0000000000..1a4d5f6f93
--- /dev/null
+++ b/libavcodec/vvc/intra_template.c
@@ -0,0 +1,1015 @@
+/*
+ * VVC intra prediction DSP
+ *
+ * Copyright (C) 2021-2023 Nuomi
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavcodec/bit_depth_template.c"
+
+#include "intra.h"
+
+#define POS(x, y) src[(x) + stride * (y)]
+
+static av_always_inline void FUNC(cclm_linear_pred)(VVCFrameContext *fc, const int x0, const int y0,
+    const int w, const int h, const pixel* pdsy, const int *a, const int *b, const int *k)
+{
+    const VVCSPS *sps = fc->ps.sps;
+    for (int i = 0; i < VVC_MAX_SAMPLE_ARRAYS - 1; i++) {
+        const int c_idx = i + 1;
+        const int x = x0 >> sps->hshift[c_idx];
+        const int y = y0 >> sps->vshift[c_idx];
+        const ptrdiff_t stride = fc->frame->linesize[c_idx] / sizeof(pixel);
+        pixel *src = (pixel*)fc->frame->data[c_idx] + x + y * stride;
+        for (int y = 0; y < h; y++) {
+            for (int x = 0; x < w; x++) {
+                const int dsy = pdsy[y * w + x];
+                const int pred = ((dsy * a[i]) >> k[i]) + b[i];
+                POS(x, y) = CLIP(pred);
+            }
+        }
+    }
+}
+
+#define MAX_PICK_POS 4
+#define TOP  0
+#define LEFT 1
+
+static av_always_inline void FUNC(cclm_get_params_default)(int *a, int *b, int *k)
+{
+    for (int i = 0; i < 2; i++) {
+        a[i] = k[i] = 0;
+        b[i] = 1 << (BIT_DEPTH - 1);
+    }
+}
+
+static av_always_inline int FUNC(cclm_get_select_pos)(const VVCLocalContext *lc,
+    const int x, const int y, const int w, const int h, const int avail_t, const int avail_l,
+    int cnt[2], int pos[2][MAX_PICK_POS])
+{
+    const enum IntraPredMode mode = lc->cu->intra_pred_mode_c;
+    const int num_is4 = !avail_t || !avail_l || mode != INTRA_LT_CCLM;
+    int num_samp[2];
+
+    if (mode == INTRA_LT_CCLM) {
+        num_samp[TOP]  = avail_t ? w : 0;
+        num_samp[LEFT] = avail_l ? h : 0;
+    } else {
+        num_samp[TOP] = (avail_t && mode == INTRA_T_CCLM) ? ff_vvc_get_top_available(lc,  x, y, w + FFMIN(w, h), 1) : 0;
+        num_samp[LEFT] = (avail_l && mode == INTRA_L_CCLM) ? ff_vvc_get_left_available(lc, x, y, h + FFMIN(w, h), 1) : 0;
+    }
+    if (!num_samp[TOP] && !num_samp[LEFT]) {
+        return 0;
+    }
+    for (int i = TOP; i <= LEFT; i++) {
+        const int start = num_samp[i] >> (2 + num_is4);
+        const int step  = FFMAX(1, num_samp[i] >> (1 + num_is4)) ;
+        cnt[i] = FFMIN(num_samp[i], (1 + num_is4) << 1);
+        for (int c = 0; c < cnt[i]; c++)
+            pos[i][c] = start + c * step;
+    }
+    return 1;
+}
+
+static av_always_inline void FUNC(cclm_select_luma_444)(const pixel *src, const int step,
+    const int cnt, const int pos[MAX_PICK_POS],  pixel *sel_luma)
+{
+    for (int i = 0; i < cnt; i++)
+        sel_luma[i] = src[pos[i] * step];
+}
+
+static av_always_inline void FUNC(cclm_select_luma)(const VVCFrameContext *fc,
+    const int x0, const int y0, const int avail_t, const int avail_l, const int cnt[2], const int pos[2][MAX_PICK_POS],
+    pixel *sel_luma)
+{
+    const VVCSPS *sps = fc->ps.sps;
+
+    const int b_ctu_boundary = !av_mod_uintp2(y0, sps->ctb_log2_size_y);
+    const int hs = sps->hshift[1];
+    const int vs = sps->vshift[1];
+    const ptrdiff_t stride = fc->frame->linesize[0] / sizeof(pixel);
+
+    if (!hs && !vs) {
+        const pixel* src = (pixel*)fc->frame->data[0] + x0 + y0 * stride;
+        FUNC(cclm_select_luma_444)(src - avail_t * stride, 1, cnt[TOP], pos[TOP], sel_luma);
+        FUNC(cclm_select_luma_444)(src - avail_l, stride, cnt[LEFT], pos[LEFT], sel_luma + cnt[TOP]);
+    } else {
+        // top
+        if (vs && !b_ctu_boundary) {
+            const pixel *source = (pixel *)fc->frame->data[0] + x0 + (y0 - 2) * stride;
+            for (int i = 0; i < cnt[TOP]; i++) {
+                const int x = pos[TOP][i] << hs;
+                const pixel *src = source + x;
+                const int has_left = x || avail_l;
+                const pixel l = has_left ? POS(-1, 0) : POS(0, 0);
+                if (sps->r->sps_chroma_vertical_collocated_flag) {
+                    sel_luma[i] = (POS(0, -1) + l + 4 * POS(0, 0) + POS(1, 0) + POS(0, 1) + 4) >> 3;
+                } else {
+                    const pixel l1 = has_left ? POS(-1, 1) : POS(0, 1);
+                    sel_luma[i] = (l + l1 + 2 * (POS(0, 0) + POS(0, 1)) + POS(1, 0) + POS(1, 1) + 4) >> 3;
+                }
+            }
+        } else {
+            const pixel *source = (pixel*)fc->frame->data[0] + x0 + (y0 - 1) * stride;
+            for (int i = 0; i < cnt[TOP]; i++) {
+                const int x = pos[TOP][i] << hs;
+                const pixel *src = source + x;
+                const int has_left = x || avail_l;
+                const pixel l = has_left ? POS(-1, 0) : POS(0, 0);
+                sel_luma[i] = (l + 2 * POS(0, 0) + POS(1, 0) + 2) >> 2;
+            }
+        }
+
+        // left
+        {
+            const pixel *left;
+            const pixel *source = (pixel *)fc->frame->data[0] + x0 + y0 * stride - (1 + hs) * avail_l;
+            left = source - avail_l;
+
+            for (int i = 0; i < cnt[LEFT]; i++) {
+                const int y = pos[LEFT][i] << vs;
+                const int offset = y * stride;
+                const pixel *l   = left + offset;
+                const pixel *src = source + offset;
+                pixel pred;
+                if (!vs) {
+                    pred = (*l + 2 * POS(0, 0) + POS(1, 0) + 2) >> 2;
+                } else {
+                    if (sps->r->sps_chroma_vertical_collocated_flag) {
+                        const int has_top = y || avail_t;
+                        const pixel t = has_top ? POS(0, -1) : POS(0, 0);
+                        pred = (*l + t + 4 * POS(0, 0) + POS(1, 0) + POS(0, 1) + 4) >> 3;
+                    } else {
+                        pred = (*l + *(l + stride) + 2 * POS(0, 0) + 2 * POS(0, 1) + POS(1, 0) + POS(1, 1) + 4) >> 3;
+                    }
+                }
+                sel_luma[i + cnt[TOP]] = pred;
+            }
+        }
+    }
+}
+
+static av_always_inline void FUNC(cclm_select_chroma)(const VVCFrameContext *fc,
+    const int x, const int y, const int cnt[2], const int pos[2][MAX_PICK_POS],
+    pixel sel[][MAX_PICK_POS * 2])
+{
+    for (int c_idx = 1; c_idx < VVC_MAX_SAMPLE_ARRAYS; c_idx++) {
+        const ptrdiff_t stride = fc->frame->linesize[c_idx] / sizeof(pixel);
+
+        //top
+        const pixel *src = (pixel*)fc->frame->data[c_idx] + x + (y - 1)* stride;
+        for (int i = 0; i < cnt[TOP]; i++) {
+            sel[c_idx][i] = src[pos[TOP][i]];
+        }
+
+        //left
+        src = (pixel*)fc->frame->data[c_idx] + x - 1 + y * stride;
+        for (int i = 0; i < cnt[LEFT]; i++) {
+            sel[c_idx][i + cnt[TOP]] = src[pos[LEFT][i] * stride];
+        }
+    }
+}
+
+static av_always_inline int FUNC(cclm_select_samples)(const VVCLocalContext *lc,
+    const int x0, const int y0, const int w, const int h, const int avail_t, const int avail_l,
+    pixel sel[][MAX_PICK_POS * 2])
+{
+    const VVCFrameContext *fc = lc->fc;
+    const VVCSPS *sps   = fc->ps.sps;
+    const int x  = x0 >> sps->hshift[1];
+    const int y  = y0 >> sps->vshift[1];
+    int cnt[2], pos[2][MAX_PICK_POS];
+
+    if (!FUNC(cclm_get_select_pos)(lc, x, y, w, h, avail_t, avail_l, cnt, pos))
+        return 0;
+
+    FUNC(cclm_select_luma)(fc, x0, y0, avail_t, avail_l, cnt, pos, sel[LUMA]);
+    FUNC(cclm_select_chroma)(fc, x, y, cnt, pos, sel);
+
+    if (cnt[TOP] + cnt[LEFT] == 2) {
+        for (int c_idx = 0; c_idx < VVC_MAX_SAMPLE_ARRAYS; c_idx++) {
+            sel[c_idx][3] = sel[c_idx][0];
+            sel[c_idx][2] = sel[c_idx][1];
+            sel[c_idx][0] = sel[c_idx][1];
+            sel[c_idx][1] = sel[c_idx][3];
+        }
+    }
+    return 1;
+}
+
+static av_always_inline void FUNC(cclm_get_min_max)(
+    const pixel sel[][MAX_PICK_POS * 2], int *min, int *max)
+{
+    int min_grp_idx[] = { 0, 2 };
+    int max_grp_idx[] = { 1, 3 };
+
+    if (sel[LUMA][min_grp_idx[0]] > sel[LUMA][min_grp_idx[1]])
+        FFSWAP(int, min_grp_idx[0], min_grp_idx[1]);
+    if (sel[LUMA][max_grp_idx[0]] > sel[LUMA][max_grp_idx[1]])
+        FFSWAP(int, max_grp_idx[0], max_grp_idx[1]);
+    if (sel[LUMA][min_grp_idx[0]] > sel[LUMA][max_grp_idx[1]]) {
+        FFSWAP(int, min_grp_idx[0], max_grp_idx[0]);
+        FFSWAP(int, min_grp_idx[1], max_grp_idx[1]);
+    }
+    if (sel[LUMA][min_grp_idx[1]] > sel[LUMA][max_grp_idx[0]])
+        FFSWAP(int, min_grp_idx[1], max_grp_idx[0]);
+    for (int c_idx = 0; c_idx < VVC_MAX_SAMPLE_ARRAYS; c_idx++) {
+        max[c_idx] = (sel[c_idx][max_grp_idx[0]] + sel[c_idx][max_grp_idx[1]] + 1) >> 1;
+        min[c_idx] = (sel[c_idx][min_grp_idx[0]] + sel[c_idx][min_grp_idx[1]] + 1) >> 1;
+    }
+}
+
+static av_always_inline void FUNC(cclm_get_params)(const VVCLocalContext *lc,
+    const int x0, const int y0, const int w, const int h, const int avail_t, const int avail_l,
+    int *a, int *b, int *k)
+{
+    pixel sel[VVC_MAX_SAMPLE_ARRAYS][MAX_PICK_POS * 2];
+    int max[VVC_MAX_SAMPLE_ARRAYS], min[VVC_MAX_SAMPLE_ARRAYS];
+    int diff;
+
+    if (!FUNC(cclm_select_samples)(lc, x0, y0, w, h, avail_t, avail_l, sel)) {
+        FUNC(cclm_get_params_default)(a, b, k);
+        return;
+    }
+
+    FUNC(cclm_get_min_max)(sel, min, max);
+
+    diff = max[LUMA] - min[LUMA];
+    if (diff == 0) {
+        for (int i = 0; i < 2; i++) {
+            a[i] = k[i] = 0;
+            b[i] = min[i + 1];
+        }
+        return;
+    }
+    for (int i = 0; i < 2; i++) {
+        const static int div_sig_table[] = {0, 7, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 0};
+        const int diffc = max[i + 1] - min[i + 1];
+        int  x = av_log2(diff);
+        int  y, v, sign, add;
+        const int norm_diff = ((diff << 4) >> x) & 15;
+        x += (norm_diff) ? 1 : 0;
+        y = abs(diffc) > 0 ? av_log2(abs(diffc)) + 1 : 0;
+        v = div_sig_table[norm_diff] | 8;
+        add = (1 << y >> 1);
+        a[i] = (diffc * v + add) >> y;
+        k[i] = FFMAX(1, 3 + x -y);
+        sign = a[i] < 0 ? -1 : (a[i] > 0);
+        a[i] = ((3 + x - y) < 1) ?  sign * 15 : a[i];
+        b[i] = min[i + 1] - ((a[i] * min[0]) >> k[i]);
+    }
+
+}
+
+#undef TOP
+#undef LEFT
+
+static av_always_inline void FUNC(cclm_get_luma_rec_pixels)(const VVCFrameContext *fc,
+    const int x0, const int y0, const int w, const int h, const int avail_t, const int avail_l,
+    pixel *pdsy)
+{
+    const int hs            = fc->ps.sps->hshift[1];
+    const int vs            = fc->ps.sps->vshift[1];
+    const ptrdiff_t stride  = fc->frame->linesize[0] / sizeof(pixel);
+    const pixel *source     = (pixel*)fc->frame->data[0] + x0 + y0 * stride;
+    const pixel *left       = source - avail_l;
+    const pixel *top        = source - avail_t * stride;
+
+    const VVCSPS *sps = fc->ps.sps;
+    if (!hs && !vs) {
+        for (int i = 0; i < h; i++)
+            memcpy(pdsy + i * w, source + i * stride, w * sizeof(pixel));
+        return;
+    }
+    for (int i = 0; i < h; i++) {
+        const pixel *src  = source;
+        const pixel *l = left;
+        const pixel *t = top;
+        if (!vs) {
+            for (int j = 0; j < w; j++) {
+                pixel pred  = (*l + 2 * POS(0, 0) + POS(1, 0) + 2) >> 2;
+                pdsy[i * w + j] = pred;
+                src += 2;
+                l = src - 1;
+            }
+
+        } else {
+            if (sps->r->sps_chroma_vertical_collocated_flag)  {
+                for (int j = 0; j < w; j++) {
+                    pixel pred  = (*l + *t + 4 * POS(0, 0) + POS(1, 0) + POS(0, 1) + 4) >> 3;
+                    pdsy[i * w + j] = pred;
+                    src += 2;
+                    t += 2;
+                    l = src - 1;
+                }
+            } else {
+                for (int j = 0; j < w; j++) {
+                    pixel pred  = (*l + *(l + stride) + 2 * POS(0, 0) + 2 * POS(0, 1) + POS(1, 0) + POS(1, 1) + 4) >> 3;
+
+                    pdsy[i * w + j] = pred;
+                    src += 2;
+                    l = src - 1;
+                }
+            }
+        }
+        source += (stride << vs);
+        left   += (stride << vs);
+        top    = source - stride;
+    }
+}
+
+static av_always_inline void FUNC(cclm_pred_default)(VVCFrameContext *fc,
+    const int x, const int y, const int w, const int h, const int avail_t, const int avail_l)
+{
+    for (int c_idx = 1; c_idx < VVC_MAX_SAMPLE_ARRAYS; c_idx++) {
+        const ptrdiff_t stride = fc->frame->linesize[c_idx] / sizeof(pixel);
+        pixel *dst = (pixel*)fc->frame->data[c_idx] + x + y * stride;
+        for (int i = 0; i < h; i++) {
+            for (int j = 0; j < w; j++) {
+                dst[j] = 1 << (BIT_DEPTH - 1);
+            }
+            dst += stride;
+        }
+    }
+}
+
+//8.4.5.2.14 Specification of INTRA_LT_CCLM, INTRA_L_CCLM and INTRA_T_CCLM intra prediction mode
+static void FUNC(intra_cclm_pred)(const VVCLocalContext *lc, const int x0, const int y0,
+    const int width, const int height)
+{
+    VVCFrameContext *fc     = lc->fc;
+    const VVCSPS *sps = fc->ps.sps;
+    const int avail_t = ff_vvc_get_top_available(lc, x0, y0, 1, 0);
+    const int avail_l = ff_vvc_get_left_available(lc, x0, y0, 1, 0);
+    const int hs = sps->hshift[1];
+    const int vs = sps->vshift[1];
+    const int x  = x0 >> hs;
+    const int y  = y0 >> vs;
+    const int w  = width >> hs;
+    const int h  = height >> vs;
+    int a[2], b[2], k[2];
+
+    pixel dsy[MAX_TB_SIZE * MAX_TB_SIZE];
+    if (!avail_t && !avail_l) {
+        FUNC(cclm_pred_default)(fc, x, y, w, h, avail_t, avail_l);
+        return;
+    }
+    FUNC(cclm_get_luma_rec_pixels)(fc, x0, y0, w, h, avail_t, avail_l, dsy);
+    FUNC(cclm_get_params) (lc, x0, y0, w, h, avail_t, avail_l, a, b, k);
+    FUNC(cclm_linear_pred)(fc, x0, y0, w, h, dsy, a, b, k);
+}
+
+static int FUNC(lmcs_sum_samples)(const pixel *start, ptrdiff_t stride, const int avail, const int target_size)
+{
+    const int size = FFMIN(avail, target_size);
+    int sum = 0;
+    for (int i = 0; i < size; i++) {
+        sum += *start;
+        start += stride;
+    }
+    sum += *(start - stride) * (target_size - size);
+    return sum;
+}
+
+// 8.7.5.3 Picture reconstruction with luma dependent chroma residual scaling process for chroma samples
+static int FUNC(lmcs_derive_chroma_scale)(VVCLocalContext *lc, const int x0, const int y0)
+{
+    VVCFrameContext *fc = lc->fc;
+    const VVCLMCS *lmcs = &fc->ps.lmcs;
+    const int size_y    = FFMIN(fc->ps.sps->ctb_size_y, 64);
+
+    const int x = x0 & ~(size_y - 1);
+    const int y = y0 & ~(size_y - 1);
+    if (lc->lmcs.x_vpdu != x || lc->lmcs.y_vpdu != y) {
+        int cnt = 0, luma = 0, i;
+        const pixel *src = (const pixel *)(fc->frame->data[LUMA] + y * fc->frame->linesize[LUMA] + (x << fc->ps.sps->pixel_shift));
+        const ptrdiff_t stride = fc->frame->linesize[LUMA] / sizeof(pixel);
+        const int avail_t = ff_vvc_get_top_available (lc, x, y, 1, 0);
+        const int avail_l = ff_vvc_get_left_available(lc, x, y, 1, 0);
+        if (avail_l) {
+            luma += FUNC(lmcs_sum_samples)(src - 1, stride, fc->ps.pps->height - y, size_y);
+            cnt = size_y;
+        }
+        if (avail_t) {
+            luma += FUNC(lmcs_sum_samples)(src - stride, 1, fc->ps.pps->width - x, size_y);
+            cnt += size_y;
+        }
+        if (cnt)
+            luma = (luma + (cnt >> 1)) >> av_log2(cnt);
+        else
+            luma = 1 << (BIT_DEPTH - 1);
+
+        for (i = lmcs->min_bin_idx; i <= lmcs->max_bin_idx; i++) {
+            if (luma < lmcs->pivot[i + 1])
+                break;
+        }
+        i = FFMIN(i, LMCS_MAX_BIN_SIZE - 1);
+
+        lc->lmcs.chroma_scale = lmcs->chroma_scale_coeff[i];
+        lc->lmcs.x_vpdu = x;
+        lc->lmcs.y_vpdu = y;
+    }
+    return lc->lmcs.chroma_scale;
+}
+
+// 8.7.5.3 Picture reconstruction with luma dependent chroma residual scaling process for chroma samples
+static void FUNC(lmcs_scale_chroma)(VVCLocalContext *lc, int *dst, const int *coeff,
+    const int width, const int height, const int x0_cu, const int y0_cu)
+{
+    const int chroma_scale = FUNC(lmcs_derive_chroma_scale)(lc, x0_cu, y0_cu);
+
+    for (int y = 0; y < height; y++) {
+        for (int x = 0; x < width; x++) {
+            const int c = av_clip_intp2(*coeff, BIT_DEPTH);
+
+            if (c > 0)
+                *dst = (c * chroma_scale + (1 << 10)) >> 11;
+            else
+                *dst = -((-c * chroma_scale + (1 << 10)) >> 11);
+            coeff++;
+            dst++;
+        }
+    }
+}
+
+static av_always_inline void FUNC(ref_filter)(const pixel *left, const pixel *top,
+    pixel *filtered_left, pixel *filtered_top, const int left_size, const int top_size,
+    const int unfilter_last_one)
+{
+    filtered_left[-1] = filtered_top[-1] = (left[0] +  2 * left[-1] + top[0] + 2 ) >> 2;
+    for (int i = 0; i < left_size - unfilter_last_one; i++) {
+        filtered_left[i] = (left[i- 1] + 2 * left[i] + left[i + 1] + 2) >> 2;
+    }
+    for (int i = 0; i < top_size - unfilter_last_one; i++) {
+        filtered_top[i] = (top[i-1] + 2 * top[i] + top[i + 1] + 2) >> 2;
+    }
+    if (unfilter_last_one) {
+        filtered_top[top_size - 1] = top[top_size - 1];
+        filtered_left[left_size - 1] = left[left_size - 1];
+    }
+}
+
+static av_always_inline void FUNC(prepare_intra_edge_params)(const VVCLocalContext *lc,
+    IntraEdgeParams* edge, const pixel *src, const ptrdiff_t stride,
+    const int x, int y, int w, int h, int c_idx, const int is_intra_mip,
+    const int mode, const int ref_idx, const int need_pdpc)
+{
+#define EXTEND(ptr, val, len)         \
+do {                                  \
+    for (i = 0; i < (len); i++)       \
+        *(ptr + i) = val;             \
+} while (0)
+    const CodingUnit *cu = lc->cu;
+    const int ref_filter_flag = is_intra_mip ? 0 : ff_vvc_ref_filter_flag_derive(mode);
+    const int filter_flag = !ref_idx && w * h > 32 && !c_idx &&
+        cu->isp_split_type == ISP_NO_SPLIT && ref_filter_flag;
+    int cand_up_left      = lc->na.cand_up_left;
+    pixel  *left          = (pixel*)edge->left_array + MAX_TB_SIZE + 3;
+    pixel  *top           = (pixel*)edge->top_array  + MAX_TB_SIZE + 3;
+    pixel  *filtered_left = (pixel*)edge->filtered_left_array + MAX_TB_SIZE + 3;
+    pixel  *filtered_top  = (pixel*)edge->filtered_top_array  + MAX_TB_SIZE + 3;
+    const int ref_line = ref_idx == 3 ? -4 : (-1 - ref_idx);
+    int left_size, top_size, unfilter_left_size, unfilter_top_size;
+    int left_available, top_available;
+    int refw, refh;
+    int intra_pred_angle, inv_angle;
+    int i;
+
+    if (is_intra_mip || mode == INTRA_PLANAR) {
+        left_size = h + 1;
+        top_size  = w + 1;
+        unfilter_left_size = left_size + filter_flag;
+        unfilter_top_size  = top_size  + filter_flag;
+    } else if (mode == INTRA_DC) {
+        unfilter_left_size = left_size = h;
+        unfilter_top_size = top_size  = w;
+    } else if (mode == INTRA_VERT) {
+        //we may need 1 pixel to predict the top left.
+        unfilter_left_size = left_size = need_pdpc ? h : 1;
+        unfilter_top_size = top_size  = w;
+    } else if (mode == INTRA_HORZ) {
+        unfilter_left_size = left_size = h;
+        //even need_pdpc == 0, we may need 1 pixel to predict the top left.
+        unfilter_top_size = top_size = need_pdpc ? w : 1;
+    } else {
+        if (cu->isp_split_type == ISP_NO_SPLIT || c_idx) {
+            refw = w * 2;
+            refh = h * 2;
+        } else {
+            refw = cu->cb_width + w;
+            refh = cu->cb_height + h;
+        }
+        intra_pred_angle = ff_vvc_intra_pred_angle_derive(mode);
+        inv_angle = ff_vvc_intra_inv_angle_derive(intra_pred_angle);
+        unfilter_top_size = top_size  = refw;
+        unfilter_left_size = left_size = refh;
+    }
+
+    left_available = ff_vvc_get_left_available(lc, x, y, unfilter_left_size, c_idx);
+    for (i = 0; i < left_available; i++)
+        left[i] = POS(ref_line, i);
+
+    top_available = ff_vvc_get_top_available(lc, x, y, unfilter_top_size, c_idx);
+    memcpy(top, src + ref_line * stride, top_available * sizeof(pixel));
+
+    for (int i = -1; i >= ref_line; i--) {
+        if (cand_up_left) {
+            left[i] = POS(ref_line, i);
+            top[i]  = POS(i, ref_line);
+        } else if (left_available) {
+            left[i] = top[i] = left[0];
+        } else if (top_available) {
+            left[i] = top[i] = top[0];
+        } else {
+            left[i] = top[i] = 1 << (BIT_DEPTH - 1);
+        }
+    }
+
+    EXTEND(top + top_available, top[top_available-1], unfilter_top_size - top_available);
+    EXTEND(left + left_available, left[left_available-1], unfilter_left_size - left_available);
+
+    if (ref_filter_flag) {
+        if (!ref_idx && w * h > 32 && !c_idx && cu->isp_split_type == ISP_NO_SPLIT ) {
+            const int unfilter_last_one = left_size == unfilter_left_size;
+            FUNC(ref_filter)(left, top, filtered_left, filtered_top, unfilter_left_size, unfilter_top_size, unfilter_last_one);
+            left = filtered_left;
+            top  = filtered_top;
+        }
+    }
+    if (!is_intra_mip && mode != INTRA_PLANAR && mode != INTRA_DC) {
+        if (ref_filter_flag || ref_idx || cu->isp_split_type != ISP_NO_SPLIT) {
+            edge->filter_flag = 0;
+        } else {
+            const int min_dist_ver_hor = FFMIN(abs(mode - 50), abs(mode - 18));
+            const int intra_hor_ver_dist_thres[] = {24, 14, 2, 0, 0};
+            const int ntbs = (av_log2(w) + av_log2(h)) >> 1;
+            edge->filter_flag = min_dist_ver_hor > intra_hor_ver_dist_thres[ntbs - 2];
+        }
+
+        if (mode != INTRA_VERT && mode != INTRA_HORZ) {
+            if (mode >= INTRA_DIAG) {
+                if (intra_pred_angle < 0) {
+                    pixel *p = top - (ref_idx + 1);
+                    for (int x = -h; x < 0; x++) {
+                        const int idx = -1 - ref_idx + FFMIN((x*inv_angle + 256) >> 9, h);
+                        p[x] = left[idx];
+                    }
+                } else {
+                    for (int i = refw; i <= refw + FFMAX(1, w/h) * ref_idx + 1; i++)
+                        top[i] = top[refw - 1];
+                }
+            } else {
+                if (intra_pred_angle < 0) {
+                    pixel *p = left - (ref_idx + 1);
+                    for (int x = -w; x < 0; x++) {
+                        const int idx = -1 - ref_idx + FFMIN((x*inv_angle + 256) >> 9, w);
+                        p[x] = top[idx];
+                    }
+                } else {
+                    for (int i = refh; i <= refh + FFMAX(1, h/w) * ref_idx + 1; i++)
+                        left[i] = left[refh - 1];
+                }
+            }
+        }
+    }
+    edge->left = (uint8_t*)left;
+    edge->top  = (uint8_t*)top;
+}
+
+//8.4.1 General decoding process for coding units coded in intra prediction mode
+static void FUNC(intra_pred)(const VVCLocalContext *lc, int x0, int y0,
+    const int width, const int height, int c_idx)
+{
+    VVCFrameContext *fc     = lc->fc;
+    const VVCSPS *sps = fc->ps.sps;
+    const VVCPPS *pps = fc->ps.pps;
+    const CodingUnit *cu = lc->cu;
+    const int log2_min_cb_size    = sps->min_cb_log2_size_y;
+    const int min_cb_width        = pps->min_cb_width;
+    const int x_cb                = x0 >> log2_min_cb_size;
+    const int y_cb                = y0 >> log2_min_cb_size;
+
+    const int hshift = fc->ps.sps->hshift[c_idx];
+    const int vshift = fc->ps.sps->vshift[c_idx];
+    const int x = x0 >> hshift;
+    const int y = y0 >> vshift;
+    const int w = width >> hshift;
+    const int h = height >> vshift;
+    const ptrdiff_t stride = fc->frame->linesize[c_idx] / sizeof(pixel);
+
+    const int pred_mode = c_idx ? cu->intra_pred_mode_c : cu->intra_pred_mode_y;
+    const int mode = ff_vvc_wide_angle_mode_mapping(cu, w, h, c_idx, pred_mode);
+
+    const int intra_mip_flag  = SAMPLE_CTB(fc->tab.imf, x_cb, y_cb);
+    const int is_intra_mip    = intra_mip_flag && (!c_idx || cu->mip_chroma_direct_flag);
+    const int ref_idx = c_idx ? 0 : cu->intra_luma_ref_idx;
+    const int need_pdpc = ff_vvc_need_pdpc(w, h, cu->bdpcm_flag[c_idx], mode, ref_idx);
+
+
+    pixel *src = (pixel*)fc->frame->data[c_idx] + x + y * stride;
+    IntraEdgeParams edge;
+
+    FUNC(prepare_intra_edge_params)(lc, &edge, src, stride, x, y, w, h, c_idx, is_intra_mip, mode, ref_idx, need_pdpc);
+
+    if (is_intra_mip) {
+        int intra_mip_transposed_flag = SAMPLE_CTB(fc->tab.imtf, x_cb, y_cb);
+        int intra_mip_mode = SAMPLE_CTB(fc->tab.imm, x_cb, y_cb);
+
+        fc->vvcdsp.intra.pred_mip((uint8_t *)src, edge.top, edge.left,
+                        w, h, stride, intra_mip_mode, intra_mip_transposed_flag);
+    } else if (mode == INTRA_PLANAR) {
+        fc->vvcdsp.intra.pred_planar((uint8_t *)src, edge.top, edge.left, w, h, stride);
+    } else if (mode == INTRA_DC) {
+        fc->vvcdsp.intra.pred_dc((uint8_t *)src, edge.top, edge.left, w, h, stride);
+    } else if (mode == INTRA_VERT) {
+        fc->vvcdsp.intra.pred_v((uint8_t *)src, edge.top, w, h, stride);
+    } else if (mode == INTRA_HORZ) {
+        fc->vvcdsp.intra.pred_h((uint8_t *)src, edge.left, w, h, stride);
+    } else {
+        if (mode >= INTRA_DIAG) {
+            fc->vvcdsp.intra.pred_angular_v((uint8_t *)src, edge.top, edge.left,
+                                  w, h, stride, c_idx, mode, ref_idx,
+                                  edge.filter_flag, need_pdpc);
+        } else {
+            fc->vvcdsp.intra.pred_angular_h((uint8_t *)src, edge.top, edge.left,
+                                  w, h, stride, c_idx, mode, ref_idx,
+                                  edge.filter_flag, need_pdpc);
+        }
+    }
+    if (need_pdpc) {
+        //8.4.5.2.15 Position-dependent intra prediction sample filtering process
+        if (!is_intra_mip && (mode == INTRA_PLANAR || mode == INTRA_DC ||
+            mode == INTRA_VERT || mode == INTRA_HORZ)) {
+            const int scale = (av_log2(w) + av_log2(h) - 2) >> 2;
+            const pixel *left = (pixel*)edge.left;
+            const pixel *top  = (pixel*)edge.top;
+            for (int y = 0; y < h; y++) {
+                for (int x = 0; x < w; x++) {
+                    int l, t, wl, wt, pred;
+                    pixel val;
+                    if (mode == INTRA_PLANAR || mode == INTRA_DC) {
+                        l  = left[y];
+                        t = top[x];
+                        wl = 32 >> FFMIN((x << 1) >> scale, 31);
+                        wt = 32 >> FFMIN((y << 1) >> scale, 31);
+                    } else {
+                        l  = left[y] - left[-1] + POS(x,y);
+                        t = top[x] - top[-1] + POS(x,y);
+                        wl = (mode == INTRA_VERT) ?  (32 >> FFMIN((x << 1) >> scale, 31)) : 0;
+                        wt = (mode == INTRA_HORZ) ?  (32 >> FFMIN((y << 1) >> scale, 31)) : 0;
+                    }
+                    val = POS(x, y);
+                    pred  = val + ((wl * (l - val) + wt * (t - val) + 32) >> 6);
+                    POS(x, y) = CLIP(pred);
+                }
+            }
+        }
+    }
+}
+
+//8.4.5.2.11 Specification of INTRA_PLANAR intra prediction mode
+static av_always_inline void FUNC(pred_planar)(uint8_t *_src, const uint8_t *_top,
+    const uint8_t *_left, const int w, const int h, const ptrdiff_t stride)
+{
+    int x, y;
+    pixel *src        = (pixel *)_src;
+    const pixel *top  = (const pixel *)_top;
+    const pixel *left = (const pixel *)_left;
+    const int logw  = av_log2(w);
+    const int logh  = av_log2(h);
+    const int size  =  w * h;
+    const int shift = (logw + logh + 1);
+    for (y = 0; y < h; y++) {
+        for (x = 0; x < w; x++) {
+            const int pred_v = ((h - 1 - y) * top[x]  + (y + 1) * left[h]) << logw;
+            const int pred_h = ((w - 1 - x) * left[y] + (x + 1) * top[w]) << logh;
+            const int pred = (pred_v + pred_h + size) >> shift;
+            POS(x, y) = pred;
+        }
+    }
+}
+
+//8.4.5.2.3 MIP boundary sample downsampling process
+static av_always_inline void FUNC(mip_downsampling)(int *reduced, const int boundary_size,
+    const pixel *ref, const int n_tb_s)
+{
+    const int b_dwn = n_tb_s / boundary_size;
+    const int log2 = av_log2(b_dwn);
+
+    if (boundary_size == n_tb_s) {
+        for (int i = 0; i < n_tb_s; i++)
+            reduced[i] = ref[i];
+        return;
+    }
+    for (int i = 0; i < boundary_size; i++) {
+        int r;
+        r = *ref++;
+        for (int j = 1; j < b_dwn; j++)
+            r += *ref++;
+        reduced[i] = (r + (1 << (log2 - 1))) >> log2;
+    }
+}
+
+static av_always_inline void FUNC(mip_reduced_pred)(pixel *src, const ptrdiff_t stride,
+    const int up_hor, const int up_ver, const int pred_size, const int *reduced, const int reduced_size,
+    const int ow, const int temp0, const uint8_t *matrix, int is_transposed)
+{
+    src = &POS(up_hor - 1, up_ver - 1);
+    for (int y = 0; y < pred_size; y++) {
+        for (int x = 0; x < pred_size; x++) {
+            int pred = 0;
+            for (int i = 0; i < reduced_size; i++)
+                pred += reduced[i] * matrix[i];
+            matrix += reduced_size;
+            pred = ((pred + ow) >> 6) + temp0;
+            pred = av_clip(pred, 0, (1<<BIT_DEPTH) - 1);
+            if (is_transposed)
+                POS(y * up_hor, x * up_ver) = pred;
+            else
+                POS(x * up_hor, y * up_ver) = pred;
+        }
+    }
+}
+
+static av_always_inline void FUNC(mip_upsampling_1d)(pixel *dst, const int dst_step, const int dst_stride, const int dst_height, const int factor,
+    const pixel *boundary, const int boundary_step,  const int pred_size)
+{
+
+    for (int i = 0; i < dst_height; i++) {
+        const pixel *before = boundary;
+        const pixel *after  = dst - dst_step;
+        pixel *d = dst;
+        for (int j = 0; j < pred_size; j++) {
+            after += dst_step * factor;
+            for (int k = 1; k < factor; k++) {
+                int mid = (factor - k) * (*before) + k * (*after);
+                *d = (mid + factor / 2) / factor;
+                d += dst_step;
+            }
+            before = after;
+            d += dst_step;
+        }
+        boundary += boundary_step;
+        dst += dst_stride;
+    }
+}
+
+//8.4.5.2.2 Matrix-based intra sample prediction
+static av_always_inline void FUNC(pred_mip)(uint8_t *_src, const uint8_t *_top,
+    const uint8_t *_left, const int w, const int h, const ptrdiff_t stride,
+    int mode_id, int is_transposed)
+{
+    pixel *src        = (pixel *)_src;
+    const pixel *top  = (const pixel *)_top;
+    const pixel *left = (const pixel *)_left;
+
+    const int size_id = ff_vvc_get_mip_size_id(w, h);
+    static const int boundary_sizes[] = {2, 4, 4};
+    static const int pred_sizes[] = {4, 4, 8};
+    const int boundary_size = boundary_sizes[size_id];
+    const int pred_size     = pred_sizes[size_id];
+    const int in_size = 2 * boundary_size - ((size_id == 2) ? 1 : 0);
+    const uint8_t *matrix = ff_vvc_get_mip_matrix(size_id, mode_id);
+    const int up_hor = w / pred_size;
+    const int up_ver = h / pred_size;
+
+    int reduced[16];
+    int *red_t  = reduced;
+    int *red_l  = reduced + boundary_size;
+    int off = 1, ow = 0;
+    int temp0;
+
+    if (is_transposed) {
+        FFSWAP(int*, red_t, red_l);
+    }
+    FUNC(mip_downsampling)(red_t, boundary_size, top, w);
+    FUNC(mip_downsampling)(red_l, boundary_size, left, h);
+
+    temp0 = reduced[0];
+    if (size_id != 2) {
+        off = 0;
+        ow = (1 << (BIT_DEPTH - 1)) - temp0;
+    } else {
+        ow = reduced[1] - temp0;
+    }
+    reduced[0] = ow;
+    for (int i = 1; i < in_size; i++) {
+        reduced[i] = reduced[i + off] - temp0;
+        ow += reduced[i];
+    }
+    ow = 32 - 32 * ow;
+
+    FUNC(mip_reduced_pred)(src, stride, up_hor, up_ver, pred_size, reduced, in_size, ow, temp0, matrix, is_transposed);
+    if (up_hor > 1 || up_ver > 1) {
+        if (up_hor > 1)
+            FUNC(mip_upsampling_1d)(&POS(0, up_ver - 1), 1, up_ver * stride, pred_size, up_hor, left + up_ver - 1, up_ver, pred_size);
+        if (up_ver > 1)
+            FUNC(mip_upsampling_1d)(src, stride, 1, w, up_ver, top, 1, pred_size);
+    }
+}
+
+static av_always_inline pixel FUNC(pred_dc_val)(const pixel *top, const pixel *left,
+    const int w, const int h)
+{
+    pixel dc_val;
+    int sum = 0;
+    unsigned int offset = (w == h) ? (w << 1) : FFMAX(w, h);
+    const int shift = av_log2(offset);
+    offset >>= 1;
+    if (w >= h) {
+        for (int i = 0; i < w; i++)
+            sum += top[i];
+    }
+    if (w <= h) {
+        for (int i = 0; i < h; i++)
+            sum += left[i];
+    }
+    dc_val = (sum + offset) >> shift;
+    return dc_val;
+}
+
+//8.4.5.2.12 Specification of INTRA_DC intra prediction mode
+static av_always_inline void FUNC(pred_dc)(uint8_t *_src, const uint8_t *_top,
+    const uint8_t *_left, const int w, const int h, const ptrdiff_t stride)
+{
+    int x, y;
+    pixel *src          = (pixel *)_src;
+    const pixel *top    = (const pixel *)_top;
+    const pixel *left   = (const pixel *)_left;
+    const pixel dc      = FUNC(pred_dc_val)(top, left, w, h);
+    const pixel4 a      = PIXEL_SPLAT_X4(dc);
+    for (y = 0; y < h; y++) {
+        pixel *s = src;
+        for (x = 0; x < w; x += 4) {
+            AV_WN4P(s, a);
+            s += 4;
+        }
+        src += stride;
+    }
+}
+
+static av_always_inline void FUNC(pred_v)(uint8_t *_src, const uint8_t *_top,
+    const int w, const int h, const ptrdiff_t stride)
+{
+    pixel *src          = (pixel *)_src;
+    const pixel *top    = (const pixel *)_top;
+    for (int y = 0; y < h; y++) {
+        memcpy(src, top, sizeof(pixel)  * w);
+        src += stride;
+    }
+}
+
+static void FUNC(pred_h)(uint8_t *_src, const uint8_t *_left, const int w, const int h,
+    const ptrdiff_t stride)
+{
+    pixel *src          = (pixel *)_src;
+    const pixel *left    = (const pixel *)_left;
+    for (int y = 0; y < h; y++) {
+        const pixel4 a = PIXEL_SPLAT_X4(left[y]);
+        for (int x = 0; x < w; x += 4) {
+            AV_WN4P(&POS(x, y), a);
+        }
+    }
+}
+
+#define INTRA_LUMA_FILTER(p)    CLIP((p[0] * f[0] + p[1] * f[1] + p[2] * f[2] + p[3] * f[3] + 32) >> 6)
+#define INTRA_CHROMA_FILTER(p)  (((32 - fact) * p[1] + fact * p[2] + 16) >> 5)
+
+//8.4.5.2.13 Specification of INTRA_ANGULAR2..INTRA_ANGULAR66 intra prediction modes
+static void FUNC(pred_angular_v)(uint8_t *_src, const uint8_t *_top, const uint8_t *_left,
+    const int w, const int h, const ptrdiff_t stride, const int c_idx, const int mode,
+    const int ref_idx, const int filter_flag, const int need_pdpc)
+{
+    pixel *src          = (pixel *)_src;
+    const pixel *left   = (const pixel *)_left;
+    const pixel *top    = (const pixel *)_top - (1 + ref_idx);
+    const int intra_pred_angle = ff_vvc_intra_pred_angle_derive(mode);
+    int pos = (1 + ref_idx) * intra_pred_angle;
+    const int dp = intra_pred_angle;
+    const int is_luma = !c_idx;
+    int nscale, inv_angle;
+
+    if (need_pdpc) {
+        inv_angle = ff_vvc_intra_inv_angle_derive(intra_pred_angle);
+        nscale = ff_vvc_nscale_derive(w, h, mode);
+    }
+
+    for (int y = 0; y < h; y++) {
+        const int idx   = (pos >> 5) + ref_idx;
+        const int fact = pos & 31;
+        if (!fact && (!is_luma || !filter_flag)) {
+            for (int x = 0; x < w; x++) {
+                const pixel *p = top + x + idx + 1;
+                POS(x, y) = *p;
+            }
+        } else {
+            if (!c_idx) {
+                const int8_t *f = ff_vvc_intra_luma_filter[filter_flag][fact];
+                for (int x = 0; x < w; x++) {
+                    const pixel *p = top + x + idx;
+                    POS(x, y) = INTRA_LUMA_FILTER(p);
+                }
+            } else {
+                for (int x = 0; x < w; x++) {
+                    const pixel *p = top + x + idx;
+                    POS(x, y) = INTRA_CHROMA_FILTER(p);
+                }
+            }
+        }
+        if (need_pdpc) {
+            int inv_angle_sum = 256 + inv_angle;
+            for (int x = 0; x < FFMIN(w, 3 << nscale); x++) {
+                const pixel l   = left[y + (inv_angle_sum >> 9)];
+                const pixel val = POS(x, y);
+                const int wl    = 32 >> ((x << 1) >> nscale);
+                const int pred  = val + (((l - val) * wl + 32) >> 6);
+                POS(x, y) = CLIP(pred);
+                inv_angle_sum += inv_angle;
+            }
+        }
+        pos += dp;
+    }
+}
+
+//8.4.5.2.13 Specification of INTRA_ANGULAR2..INTRA_ANGULAR66 intra prediction modes
+static void FUNC(pred_angular_h)(uint8_t *_src, const uint8_t *_top, const uint8_t *_left,
+    const int w, const int h, const ptrdiff_t stride, const int c_idx, const int mode,
+    const int ref_idx, const int filter_flag, const int need_pdpc)
+{
+    pixel *src          = (pixel *)_src;
+    const pixel *left   = (const pixel *)_left - (1 + ref_idx);
+    const pixel *top    = (const pixel *)_top;
+    const int is_luma = !c_idx;
+    const int intra_pred_angle = ff_vvc_intra_pred_angle_derive(mode);
+    const int dp = intra_pred_angle;
+    int nscale = 0, inv_angle, inv_angle_sum;
+
+    if (need_pdpc) {
+        inv_angle = ff_vvc_intra_inv_angle_derive(intra_pred_angle);
+        inv_angle_sum = 256 + inv_angle;
+        nscale = ff_vvc_nscale_derive(w, h, mode);
+    }
+
+    for (int y = 0; y < h; y++) {
+        int pos = (1 + ref_idx) * intra_pred_angle;
+        int wt;
+        if (need_pdpc)
+            wt = (32 >> FFMIN(31, (y * 2) >> nscale));
+
+        for (int x = 0; x < w; x++) {
+            const int idx  = (pos >> 5) + ref_idx;
+            const int fact = pos & 31;
+            const pixel *p = left + y + idx;
+            int pred;
+            if (!fact && (!is_luma || !filter_flag)) {
+                pred = p[1];
+            } else {
+                if (!c_idx) {
+                    const int8_t *f = ff_vvc_intra_luma_filter[filter_flag][fact];
+                    pred = INTRA_LUMA_FILTER(p);
+                } else {
+                    pred = INTRA_CHROMA_FILTER(p);
+                }
+            }
+            if (need_pdpc) {
+                if (y < (3 << nscale)) {
+                    const pixel t = top[x + (inv_angle_sum >> 9)];
+                    pred = CLIP(pred + (((t - pred) * wt + 32) >> 6));
+                }
+            }
+            POS(x, y) = pred;
+            pos += dp;
+        }
+        if (need_pdpc)
+            inv_angle_sum += inv_angle;
+    }
+}
+
+static void FUNC(ff_vvc_intra_dsp_init)(VVCIntraDSPContext *const intra)
+{
+    intra->lmcs_scale_chroma  = FUNC(lmcs_scale_chroma);
+    intra->intra_cclm_pred    = FUNC(intra_cclm_pred);
+    intra->intra_pred         = FUNC(intra_pred);
+    intra->pred_planar        = FUNC(pred_planar);
+    intra->pred_mip           = FUNC(pred_mip);
+    intra->pred_dc            = FUNC(pred_dc);
+    intra->pred_v             = FUNC(pred_v);
+    intra->pred_h             = FUNC(pred_h);
+    intra->pred_angular_v     = FUNC(pred_angular_v);
+    intra->pred_angular_h     = FUNC(pred_angular_h);
+}