making act segmenter

1 files changed, 679 insertions, 0 deletions

diff --git a/ffmpeg/libavcodec/mss12.c b/ffmpeg/libavcodec/mss12.c
new file mode 100644
index 0000000..b522e4a
--- /dev/null
+++ b/ffmpeg/libavcodec/mss12.c
@@ -0,0 +1,679 @@
+/*
+ * Copyright (c) 2012 Konstantin Shishkov
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * Common functions for Microsoft Screen 1 and 2
+ */
+
+#include "libavutil/intfloat.h"
+#include "libavutil/intreadwrite.h"
+#include "avcodec.h"
+#include "mss12.h"
+
+enum SplitMode {
+    SPLIT_VERT = 0,
+    SPLIT_HOR,
+    SPLIT_NONE
+};
+
+static const int sec_order_sizes[4] = { 1, 7, 6, 1 };
+
+enum ContextDirection {
+    TOP_LEFT = 0,
+    TOP,
+    TOP_RIGHT,
+    LEFT
+};
+
+static int model_calc_threshold(Model *m)
+{
+    int thr;
+
+    thr = 2 * m->weights[m->num_syms] - 1;
+    thr = ((thr >> 1) + 4 * m->cum_prob[0]) / thr;
+
+    return FFMIN(thr, 0x3FFF);
+}
+
+static void model_reset(Model *m)
+{
+    int i;
+
+    for (i = 0; i <= m->num_syms; i++) {
+        m->weights[i]  = 1;
+        m->cum_prob[i] = m->num_syms - i;
+    }
+    m->weights[0] = 0;
+    for (i = 0; i < m->num_syms; i++)
+        m->idx2sym[i + 1] = i;
+}
+
+static av_cold void model_init(Model *m, int num_syms, int thr_weight)
+{
+    m->num_syms   = num_syms;
+    m->thr_weight = thr_weight;
+    m->threshold  = num_syms * thr_weight;
+}
+
+static void model_rescale_weights(Model *m)
+{
+    int i;
+    int cum_prob;
+
+    if (m->thr_weight == THRESH_ADAPTIVE)
+        m->threshold = model_calc_threshold(m);
+    while (m->cum_prob[0] > m->threshold) {
+        cum_prob = 0;
+        for (i = m->num_syms; i >= 0; i--) {
+            m->cum_prob[i] = cum_prob;
+            m->weights[i]  = (m->weights[i] + 1) >> 1;
+            cum_prob      += m->weights[i];
+        }
+    }
+}
+
+void ff_mss12_model_update(Model *m, int val)
+{
+    int i;
+
+    if (m->weights[val] == m->weights[val - 1]) {
+        for (i = val; m->weights[i - 1] == m->weights[val]; i--);
+        if (i != val) {
+            int sym1, sym2;
+
+            sym1 = m->idx2sym[val];
+            sym2 = m->idx2sym[i];
+
+            m->idx2sym[val]  = sym2;
+            m->idx2sym[i]    = sym1;
+
+            val = i;
+        }
+    }
+    m->weights[val]++;
+    for (i = val - 1; i >= 0; i--)
+        m->cum_prob[i]++;
+    model_rescale_weights(m);
+}
+
+static void pixctx_reset(PixContext *ctx)
+{
+    int i, j;
+
+    if (!ctx->special_initial_cache)
+        for (i = 0; i < ctx->cache_size; i++)
+            ctx->cache[i] = i;
+    else {
+        ctx->cache[0] = 1;
+        ctx->cache[1] = 2;
+        ctx->cache[2] = 4;
+    }
+
+    model_reset(&ctx->cache_model);
+    model_reset(&ctx->full_model);
+
+    for (i = 0; i < 15; i++)
+        for (j = 0; j < 4; j++)
+            model_reset(&ctx->sec_models[i][j]);
+}
+
+static av_cold void pixctx_init(PixContext *ctx, int cache_size,
+                                int full_model_syms, int special_initial_cache)
+{
+    int i, j, k, idx;
+
+    ctx->cache_size            = cache_size + 4;
+    ctx->num_syms              = cache_size;
+    ctx->special_initial_cache = special_initial_cache;
+
+    model_init(&ctx->cache_model, ctx->num_syms + 1, THRESH_LOW);
+    model_init(&ctx->full_model, full_model_syms, THRESH_HIGH);
+
+    for (i = 0, idx = 0; i < 4; i++)
+        for (j = 0; j < sec_order_sizes[i]; j++, idx++)
+            for (k = 0; k < 4; k++)
+                model_init(&ctx->sec_models[idx][k], 2 + i,
+                           i ? THRESH_LOW : THRESH_ADAPTIVE);
+}
+
+static av_always_inline int decode_pixel(ArithCoder *acoder, PixContext *pctx,
+                                         uint8_t *ngb, int num_ngb, int any_ngb)
+{
+    int i, val, pix;
+
+    val = acoder->get_model_sym(acoder, &pctx->cache_model);
+    if (val < pctx->num_syms) {
+        if (any_ngb) {
+            int idx, j;
+
+            idx = 0;
+            for (i = 0; i < pctx->cache_size; i++) {
+                for (j = 0; j < num_ngb; j++)
+                    if (pctx->cache[i] == ngb[j])
+                        break;
+                if (j == num_ngb) {
+                    if (idx == val)
+                        break;
+                    idx++;
+                }
+            }
+            val = FFMIN(i, pctx->cache_size - 1);
+        }
+        pix = pctx->cache[val];
+    } else {
+        pix = acoder->get_model_sym(acoder, &pctx->full_model);
+        for (i = 0; i < pctx->cache_size - 1; i++)
+            if (pctx->cache[i] == pix)
+                break;
+        val = i;
+    }
+    if (val) {
+        for (i = val; i > 0; i--)
+            pctx->cache[i] = pctx->cache[i - 1];
+        pctx->cache[0] = pix;
+    }
+
+    return pix;
+}
+
+static int decode_pixel_in_context(ArithCoder *acoder, PixContext *pctx,
+                                   uint8_t *src, int stride, int x, int y,
+                                   int has_right)
+{
+    uint8_t neighbours[4];
+    uint8_t ref_pix[4];
+    int nlen;
+    int layer = 0, sub;
+    int pix;
+    int i, j;
+
+    if (!y) {
+        memset(neighbours, src[-1], 4);
+    } else {
+        neighbours[TOP] = src[-stride];
+        if (!x) {
+            neighbours[TOP_LEFT] = neighbours[LEFT] = neighbours[TOP];
+        } else {
+            neighbours[TOP_LEFT] = src[-stride - 1];
+            neighbours[    LEFT] = src[-1];
+        }
+        if (has_right)
+            neighbours[TOP_RIGHT] = src[-stride + 1];
+        else
+            neighbours[TOP_RIGHT] = neighbours[TOP];
+    }
+
+    sub = 0;
+    if (x >= 2 && src[-2] == neighbours[LEFT])
+        sub  = 1;
+    if (y >= 2 && src[-2 * stride] == neighbours[TOP])
+        sub |= 2;
+
+    nlen = 1;
+    ref_pix[0] = neighbours[0];
+    for (i = 1; i < 4; i++) {
+        for (j = 0; j < nlen; j++)
+            if (ref_pix[j] == neighbours[i])
+                break;
+        if (j == nlen)
+            ref_pix[nlen++] = neighbours[i];
+    }
+
+    switch (nlen) {
+    case 1:
+        layer = 0;
+        break;
+    case 2:
+        if (neighbours[TOP] == neighbours[TOP_LEFT]) {
+            if (neighbours[TOP_RIGHT] == neighbours[TOP_LEFT])
+                layer = 1;
+            else if (neighbours[LEFT] == neighbours[TOP_LEFT])
+                layer = 2;
+            else
+                layer = 3;
+        } else if (neighbours[TOP_RIGHT] == neighbours[TOP_LEFT]) {
+            if (neighbours[LEFT] == neighbours[TOP_LEFT])
+                layer = 4;
+            else
+                layer = 5;
+        } else if (neighbours[LEFT] == neighbours[TOP_LEFT]) {
+            layer = 6;
+        } else {
+            layer = 7;
+        }
+        break;
+    case 3:
+        if (neighbours[TOP] == neighbours[TOP_LEFT])
+            layer = 8;
+        else if (neighbours[TOP_RIGHT] == neighbours[TOP_LEFT])
+            layer = 9;
+        else if (neighbours[LEFT] == neighbours[TOP_LEFT])
+            layer = 10;
+        else if (neighbours[TOP_RIGHT] == neighbours[TOP])
+            layer = 11;
+        else if (neighbours[TOP] == neighbours[LEFT])
+            layer = 12;
+        else
+            layer = 13;
+        break;
+    case 4:
+        layer = 14;
+        break;
+    }
+
+    pix = acoder->get_model_sym(acoder,
+                                &pctx->sec_models[layer][sub]);
+    if (pix < nlen)
+        return ref_pix[pix];
+    else
+        return decode_pixel(acoder, pctx, ref_pix, nlen, 1);
+}
+
+static int decode_region(ArithCoder *acoder, uint8_t *dst, uint8_t *rgb_pic,
+                         int x, int y, int width, int height, int stride,
+                         int rgb_stride, PixContext *pctx, const uint32_t *pal)
+{
+    int i, j, p;
+    uint8_t *rgb_dst = rgb_pic + x * 3 + y * rgb_stride;
+
+    dst += x + y * stride;
+
+    for (j = 0; j < height; j++) {
+        for (i = 0; i < width; i++) {
+            if (!i && !j)
+                p = decode_pixel(acoder, pctx, NULL, 0, 0);
+            else
+                p = decode_pixel_in_context(acoder, pctx, dst + i, stride,
+                                            i, j, width - i - 1);
+            dst[i] = p;
+
+            if (rgb_pic)
+                AV_WB24(rgb_dst + i * 3, pal[p]);
+        }
+        dst     += stride;
+        rgb_dst += rgb_stride;
+    }
+
+    return 0;
+}
+
+static void copy_rectangles(MSS12Context const *c,
+                            int x, int y, int width, int height)
+{
+    int j;
+
+    if (c->last_rgb_pic)
+        for (j = y; j < y + height; j++) {
+            memcpy(c->rgb_pic      + j * c->rgb_stride + x * 3,
+                   c->last_rgb_pic + j * c->rgb_stride + x * 3,
+                   width * 3);
+            memcpy(c->pal_pic      + j * c->pal_stride + x,
+                   c->last_pal_pic + j * c->pal_stride + x,
+                   width);
+        }
+}
+
+static int motion_compensation(MSS12Context const *c,
+                               int x, int y, int width, int height)
+{
+    if (x + c->mvX < 0 || x + c->mvX + width  > c->avctx->width  ||
+        y + c->mvY < 0 || y + c->mvY + height > c->avctx->height ||
+        !c->rgb_pic)
+        return -1;
+    else {
+        uint8_t *dst     = c->pal_pic + x     + y * c->pal_stride;
+        uint8_t *rgb_dst = c->rgb_pic + x * 3 + y * c->rgb_stride;
+        uint8_t *src;
+        uint8_t *rgb_src;
+        int j;
+        x += c->mvX;
+        y += c->mvY;
+        if (c->last_rgb_pic) {
+            src     = c->last_pal_pic + x +     y * c->pal_stride;
+            rgb_src = c->last_rgb_pic + x * 3 + y * c->rgb_stride;
+        } else {
+            src     = c->pal_pic + x     + y * c->pal_stride;
+            rgb_src = c->rgb_pic + x * 3 + y * c->rgb_stride;
+        }
+        for (j = 0; j < height; j++) {
+            memmove(dst, src, width);
+            memmove(rgb_dst, rgb_src, width * 3);
+            dst     += c->pal_stride;
+            src     += c->pal_stride;
+            rgb_dst += c->rgb_stride;
+            rgb_src += c->rgb_stride;
+        }
+    }
+    return 0;
+}
+
+static int decode_region_masked(MSS12Context const *c, ArithCoder *acoder,
+                                uint8_t *dst, int stride, uint8_t *mask,
+                                int mask_stride, int x, int y,
+                                int width, int height,
+                                PixContext *pctx)
+{
+    int i, j, p;
+    uint8_t *rgb_dst = c->rgb_pic + x * 3 + y * c->rgb_stride;
+
+    dst  += x + y * stride;
+    mask += x + y * mask_stride;
+
+    for (j = 0; j < height; j++) {
+        for (i = 0; i < width; i++) {
+            if (c->avctx->err_recognition & AV_EF_EXPLODE &&
+                ( c->rgb_pic && mask[i] != 0x01 && mask[i] != 0x02 && mask[i] != 0x04 ||
+                 !c->rgb_pic && mask[i] != 0x80 && mask[i] != 0xFF))
+                return -1;
+
+            if (mask[i] == 0x02) {
+                copy_rectangles(c, x + i, y + j, 1, 1);
+            } else if (mask[i] == 0x04) {
+                if (motion_compensation(c, x + i, y + j, 1, 1))
+                    return -1;
+            } else if (mask[i] != 0x80) {
+                if (!i && !j)
+                    p = decode_pixel(acoder, pctx, NULL, 0, 0);
+                else
+                    p = decode_pixel_in_context(acoder, pctx, dst + i, stride,
+                                                i, j, width - i - 1);
+                dst[i] = p;
+                if (c->rgb_pic)
+                    AV_WB24(rgb_dst + i * 3, c->pal[p]);
+            }
+        }
+        dst     += stride;
+        mask    += mask_stride;
+        rgb_dst += c->rgb_stride;
+    }
+
+    return 0;
+}
+
+static av_cold void slicecontext_init(SliceContext *sc,
+                                      int version, int full_model_syms)
+{
+    model_init(&sc->intra_region, 2, THRESH_ADAPTIVE);
+    model_init(&sc->inter_region, 2, THRESH_ADAPTIVE);
+    model_init(&sc->split_mode,   3, THRESH_HIGH);
+    model_init(&sc->edge_mode,    2, THRESH_HIGH);
+    model_init(&sc->pivot,        3, THRESH_LOW);
+
+    pixctx_init(&sc->intra_pix_ctx, 8, full_model_syms, 0);
+
+    pixctx_init(&sc->inter_pix_ctx, version ? 3 : 2,
+                full_model_syms, version ? 1 : 0);
+}
+
+void ff_mss12_slicecontext_reset(SliceContext *sc)
+{
+    model_reset(&sc->intra_region);
+    model_reset(&sc->inter_region);
+    model_reset(&sc->split_mode);
+    model_reset(&sc->edge_mode);
+    model_reset(&sc->pivot);
+    pixctx_reset(&sc->intra_pix_ctx);
+    pixctx_reset(&sc->inter_pix_ctx);
+}
+
+static int decode_pivot(SliceContext *sc, ArithCoder *acoder, int base)
+{
+    int val, inv;
+
+    inv = acoder->get_model_sym(acoder, &sc->edge_mode);
+    val = acoder->get_model_sym(acoder, &sc->pivot) + 1;
+
+    if (val > 2) {
+        if ((base + 1) / 2 - 2 <= 0)
+            return -1;
+
+        val = acoder->get_number(acoder, (base + 1) / 2 - 2) + 3;
+    }
+
+    if ((unsigned)val >= base)
+        return -1;
+
+    return inv ? base - val : val;
+}
+
+static int decode_region_intra(SliceContext *sc, ArithCoder *acoder,
+                               int x, int y, int width, int height)
+{
+    MSS12Context const *c = sc->c;
+    int mode;
+
+    mode = acoder->get_model_sym(acoder, &sc->intra_region);
+
+    if (!mode) {
+        int i, j, pix, rgb_pix;
+        int stride       = c->pal_stride;
+        int rgb_stride   = c->rgb_stride;
+        uint8_t *dst     = c->pal_pic + x     + y * stride;
+        uint8_t *rgb_dst = c->rgb_pic + x * 3 + y * rgb_stride;
+
+        pix     = decode_pixel(acoder, &sc->intra_pix_ctx, NULL, 0, 0);
+        rgb_pix = c->pal[pix];
+        for (i = 0; i < height; i++, dst += stride, rgb_dst += rgb_stride) {
+            memset(dst, pix, width);
+            if (c->rgb_pic)
+                for (j = 0; j < width * 3; j += 3)
+                    AV_WB24(rgb_dst + j, rgb_pix);
+        }
+    } else {
+        return decode_region(acoder, c->pal_pic, c->rgb_pic,
+                             x, y, width, height, c->pal_stride, c->rgb_stride,
+                             &sc->intra_pix_ctx, &c->pal[0]);
+    }
+
+    return 0;
+}
+
+static int decode_region_inter(SliceContext *sc, ArithCoder *acoder,
+                               int x, int y, int width, int height)
+{
+    MSS12Context const *c = sc->c;
+    int mode;
+
+    mode = acoder->get_model_sym(acoder, &sc->inter_region);
+
+    if (!mode) {
+        mode = decode_pixel(acoder, &sc->inter_pix_ctx, NULL, 0, 0);
+
+        if (c->avctx->err_recognition & AV_EF_EXPLODE &&
+            ( c->rgb_pic && mode != 0x01 && mode != 0x02 && mode != 0x04 ||
+             !c->rgb_pic && mode != 0x80 && mode != 0xFF))
+            return -1;
+
+        if (mode == 0x02)
+            copy_rectangles(c, x, y, width, height);
+        else if (mode == 0x04)
+            return motion_compensation(c, x, y, width, height);
+        else if (mode != 0x80)
+            return decode_region_intra(sc, acoder, x, y, width, height);
+    } else {
+        if (decode_region(acoder, c->mask, NULL,
+                          x, y, width, height, c->mask_stride, 0,
+                          &sc->inter_pix_ctx, &c->pal[0]) < 0)
+            return -1;
+        return decode_region_masked(c, acoder, c->pal_pic,
+                                    c->pal_stride, c->mask,
+                                    c->mask_stride,
+                                    x, y, width, height,
+                                    &sc->intra_pix_ctx);
+    }
+
+    return 0;
+}
+
+int ff_mss12_decode_rect(SliceContext *sc, ArithCoder *acoder,
+                         int x, int y, int width, int height)
+{
+    int mode, pivot;
+
+    mode = acoder->get_model_sym(acoder, &sc->split_mode);
+
+    switch (mode) {
+    case SPLIT_VERT:
+        if ((pivot = decode_pivot(sc, acoder, height)) < 1)
+            return -1;
+        if (ff_mss12_decode_rect(sc, acoder, x, y, width, pivot))
+            return -1;
+        if (ff_mss12_decode_rect(sc, acoder, x, y + pivot, width, height - pivot))
+            return -1;
+        break;
+    case SPLIT_HOR:
+        if ((pivot = decode_pivot(sc, acoder, width)) < 1)
+            return -1;
+        if (ff_mss12_decode_rect(sc, acoder, x, y, pivot, height))
+            return -1;
+        if (ff_mss12_decode_rect(sc, acoder, x + pivot, y, width - pivot, height))
+            return -1;
+        break;
+    case SPLIT_NONE:
+        if (sc->c->keyframe)
+            return decode_region_intra(sc, acoder, x, y, width, height);
+        else
+            return decode_region_inter(sc, acoder, x, y, width, height);
+    default:
+        return -1;
+    }
+
+    return 0;
+}
+
+av_cold int ff_mss12_decode_init(MSS12Context *c, int version,
+                                 SliceContext* sc1, SliceContext *sc2)
+{
+    AVCodecContext *avctx = c->avctx;
+    int i;
+
+    if (avctx->extradata_size < 52 + 256 * 3) {
+        av_log(avctx, AV_LOG_ERROR, "Insufficient extradata size %d\n",
+               avctx->extradata_size);
+        return AVERROR_INVALIDDATA;
+    }
+
+    if (AV_RB32(avctx->extradata) < avctx->extradata_size) {
+        av_log(avctx, AV_LOG_ERROR,
+               "Insufficient extradata size: expected %d got %d\n",
+               AV_RB32(avctx->extradata),
+               avctx->extradata_size);
+        return AVERROR_INVALIDDATA;
+    }
+
+    avctx->coded_width  = AV_RB32(avctx->extradata + 20);
+    avctx->coded_height = AV_RB32(avctx->extradata + 24);
+    if (avctx->coded_width > 4096 || avctx->coded_height > 4096) {
+        av_log(avctx, AV_LOG_ERROR, "Frame dimensions %dx%d too large",
+               avctx->coded_width, avctx->coded_height);
+        return AVERROR_INVALIDDATA;
+    }
+    if (avctx->coded_width < 1 || avctx->coded_height < 1) {
+        av_log(avctx, AV_LOG_ERROR, "Frame dimensions %dx%d too small",
+               avctx->coded_width, avctx->coded_height);
+        return AVERROR_INVALIDDATA;
+    }
+
+    av_log(avctx, AV_LOG_DEBUG, "Encoder version %d.%d\n",
+           AV_RB32(avctx->extradata + 4), AV_RB32(avctx->extradata + 8));
+    if (version != AV_RB32(avctx->extradata + 4) > 1) {
+        av_log(avctx, AV_LOG_ERROR,
+               "Header version doesn't match codec tag\n");
+        return -1;
+    }
+
+    c->free_colours = AV_RB32(avctx->extradata + 48);
+    if ((unsigned)c->free_colours > 256) {
+        av_log(avctx, AV_LOG_ERROR,
+               "Incorrect number of changeable palette entries: %d\n",
+               c->free_colours);
+        return AVERROR_INVALIDDATA;
+    }
+    av_log(avctx, AV_LOG_DEBUG, "%d free colour(s)\n", c->free_colours);
+
+    av_log(avctx, AV_LOG_DEBUG, "Display dimensions %dx%d\n",
+           AV_RB32(avctx->extradata + 12), AV_RB32(avctx->extradata + 16));
+    av_log(avctx, AV_LOG_DEBUG, "Coded dimensions %dx%d\n",
+           avctx->coded_width, avctx->coded_height);
+    av_log(avctx, AV_LOG_DEBUG, "%g frames per second\n",
+           av_int2float(AV_RB32(avctx->extradata + 28)));
+    av_log(avctx, AV_LOG_DEBUG, "Bitrate %d bps\n",
+           AV_RB32(avctx->extradata + 32));
+    av_log(avctx, AV_LOG_DEBUG, "Max. lead time %g ms\n",
+           av_int2float(AV_RB32(avctx->extradata + 36)));
+    av_log(avctx, AV_LOG_DEBUG, "Max. lag time %g ms\n",
+           av_int2float(AV_RB32(avctx->extradata + 40)));
+    av_log(avctx, AV_LOG_DEBUG, "Max. seek time %g ms\n",
+           av_int2float(AV_RB32(avctx->extradata + 44)));
+
+    if (version) {
+        if (avctx->extradata_size < 60 + 256 * 3) {
+            av_log(avctx, AV_LOG_ERROR,
+                   "Insufficient extradata size %d for v2\n",
+                   avctx->extradata_size);
+            return AVERROR_INVALIDDATA;
+        }
+
+        c->slice_split = AV_RB32(avctx->extradata + 52);
+        av_log(avctx, AV_LOG_DEBUG, "Slice split %d\n", c->slice_split);
+
+        c->full_model_syms = AV_RB32(avctx->extradata + 56);
+        if (c->full_model_syms < 2 || c->full_model_syms > 256) {
+            av_log(avctx, AV_LOG_ERROR,
+                   "Incorrect number of used colours %d\n",
+                   c->full_model_syms);
+            return AVERROR_INVALIDDATA;
+        }
+        av_log(avctx, AV_LOG_DEBUG, "Used colours %d\n",
+               c->full_model_syms);
+    } else {
+        c->slice_split     = 0;
+        c->full_model_syms = 256;
+    }
+
+    for (i = 0; i < 256; i++)
+        c->pal[i] = 0xFFU << 24 | AV_RB24(avctx->extradata + 52 +
+                            (version ? 8 : 0) + i * 3);
+
+    c->mask_stride = FFALIGN(avctx->width, 16);
+    c->mask        = av_malloc(c->mask_stride * avctx->height);
+    if (!c->mask) {
+        av_log(avctx, AV_LOG_ERROR, "Cannot allocate mask plane\n");
+        return AVERROR(ENOMEM);
+    }
+
+    sc1->c = c;
+    slicecontext_init(sc1, version, c->full_model_syms);
+    if (c->slice_split) {
+        sc2->c = c;
+        slicecontext_init(sc2, version, c->full_model_syms);
+    }
+    c->corrupted = 1;
+
+    return 0;
+}
+
+av_cold int ff_mss12_decode_end(MSS12Context *c)
+{
+    av_freep(&c->mask);
+
+    return 0;
+}