alpha/pixblockdsp: move code out of dsputil
[ffmpeg.git] / libavcodec / vc1.c
index df8f30a..d23efec 100644 (file)
@@ -4,20 +4,20 @@
  * Copyright (c) 2006-2007 Konstantin Shishkov
  * Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer
  *
- * This file is part of Libav.
+ * This file is part of FFmpeg.
  *
- * Libav is free software; you can redistribute it and/or
+ * 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.
  *
- * Libav is distributed in the hope that it will be useful,
+ * 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 Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
  * @{
  */
 
-/**
- * Imode types
- * @{
- */
-enum Imode {
-    IMODE_RAW,
-    IMODE_NORM2,
-    IMODE_DIFF2,
-    IMODE_NORM6,
-    IMODE_DIFF6,
-    IMODE_ROWSKIP,
-    IMODE_COLSKIP
-};
-/** @} */ //imode defines
-
 /** Decode rows by checking if they are skipped
  * @param plane Buffer to store decoded bits
  * @param[in] width Width of this buffer
@@ -137,12 +122,16 @@ static int bitplane_decoding(uint8_t* data, int *raw_flag, VC1Context *v)
     case IMODE_NORM2:
         if ((height * width) & 1) {
             *planep++ = get_bits1(gb);
-            offset    = 1;
+            y = offset = 1;
+            if (offset == width) {
+                offset = 0;
+                planep += stride - width;
+            }
         }
         else
-            offset = 0;
+            y = offset = 0;
         // decode bitplane as one long line
-        for (y = offset; y < height * width; y += 2) {
+        for (; y < height * width; y += 2) {
             code = get_vlc2(gb, ff_vc1_norm2_vlc.table, VC1_NORM2_VLC_BITS, 1);
             *planep++ = code & 1;
             offset++;
@@ -293,7 +282,7 @@ static int decode_sequence_header_adv(VC1Context *v, GetBitContext *gb);
  */
 int ff_vc1_decode_sequence_header(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb)
 {
-    av_log(avctx, AV_LOG_DEBUG, "Header: %0X\n", show_bits(gb, 32));
+    av_log(avctx, AV_LOG_DEBUG, "Header: %0X\n", show_bits_long(gb, 32));
     v->profile = get_bits(gb, 2);
     if (v->profile == PROFILE_COMPLEX) {
         av_log(avctx, AV_LOG_WARNING, "WMV3 Complex Profile is not fully supported\n");
@@ -304,6 +293,7 @@ int ff_vc1_decode_sequence_header(AVCodecContext *avctx, VC1Context *v, GetBitCo
         v->zz_4x8 = ff_vc1_adv_progressive_4x8_zz;
         return decode_sequence_header_adv(v, gb);
     } else {
+        v->chromaformat = 1;
         v->zz_8x4 = ff_wmv2_scantableA;
         v->zz_4x8 = ff_wmv2_scantableB;
         v->res_y411   = get_bits1(gb);
@@ -367,7 +357,7 @@ int ff_vc1_decode_sequence_header(AVCodecContext *avctx, VC1Context *v, GetBitCo
 
     v->overlap         = get_bits1(gb); //common
 
-    v->s.resync_marker = get_bits1(gb);
+    v->resync_marker   = get_bits1(gb);
     v->rangered        = get_bits1(gb);
     if (v->rangered && v->profile == PROFILE_SIMPLE) {
         av_log(avctx, AV_LOG_INFO,
@@ -380,8 +370,13 @@ int ff_vc1_decode_sequence_header(AVCodecContext *avctx, VC1Context *v, GetBitCo
     v->finterpflag = get_bits1(gb); //common
 
     if (v->res_sprite) {
-        v->s.avctx->width  = v->s.avctx->coded_width  = get_bits(gb, 11);
-        v->s.avctx->height = v->s.avctx->coded_height = get_bits(gb, 11);
+        int w = get_bits(gb, 11);
+        int h = get_bits(gb, 11);
+        int ret = ff_set_dimensions(v->s.avctx, w, h);
+        if (ret < 0) {
+            av_log(avctx, AV_LOG_ERROR, "Failed to set dimensions %d %d\n", w, h);
+            return ret;
+        }
         skip_bits(gb, 5); //frame rate
         v->res_x8 = get_bits1(gb);
         if (get_bits1(gb)) { // something to do with DC VLC selection
@@ -408,7 +403,7 @@ int ff_vc1_decode_sequence_header(AVCodecContext *avctx, VC1Context *v, GetBitCo
            "DQuant=%i, Quantizer mode=%i, Max B frames=%i\n",
            v->profile, v->frmrtq_postproc, v->bitrtq_postproc,
            v->s.loop_filter, v->multires, v->fastuvmc, v->extended_mv,
-           v->rangered, v->vstransform, v->overlap, v->s.resync_marker,
+           v->rangered, v->vstransform, v->overlap, v->resync_marker,
            v->dquant, v->quantizer_mode, avctx->max_b_frames);
     return 0;
 }
@@ -433,10 +428,8 @@ static int decode_sequence_header_adv(VC1Context *v, GetBitContext *gb)
     v->bitrtq_postproc       = get_bits(gb, 5); //common
     v->postprocflag          = get_bits1(gb);   //common
 
-    v->s.avctx->coded_width  = (get_bits(gb, 12) + 1) << 1;
-    v->s.avctx->coded_height = (get_bits(gb, 12) + 1) << 1;
-    v->s.avctx->width        = v->s.avctx->coded_width;
-    v->s.avctx->height       = v->s.avctx->coded_height;
+    v->max_coded_width       = (get_bits(gb, 12) + 1) << 1;
+    v->max_coded_height      = (get_bits(gb, 12) + 1) << 1;
     v->broadcast             = get_bits1(gb);
     v->interlace             = get_bits1(gb);
     v->tfcntrflag            = get_bits1(gb);
@@ -478,6 +471,7 @@ static int decode_sequence_header_adv(VC1Context *v, GetBitContext *gb)
                       v->s.avctx->width * h,
                       1 << 30);
         }
+        ff_set_sar(v->s.avctx, v->s.avctx->sample_aspect_ratio);
         av_log(v->s.avctx, AV_LOG_DEBUG, "Aspect: %i:%i\n",
                v->s.avctx->sample_aspect_ratio.num,
                v->s.avctx->sample_aspect_ratio.den);
@@ -502,9 +496,10 @@ static int decode_sequence_header_adv(VC1Context *v, GetBitContext *gb)
         }
 
         if (get_bits1(gb)) {
-            v->color_prim    = get_bits(gb, 8);
-            v->transfer_char = get_bits(gb, 8);
-            v->matrix_coef   = get_bits(gb, 8);
+            v->s.avctx->color_primaries = get_bits(gb, 8);
+            v->s.avctx->color_trc       = get_bits(gb, 8);
+            v->s.avctx->colorspace      = get_bits(gb, 8);
+            v->s.avctx->color_range     = AVCOL_RANGE_MPEG;
         }
     }
 
@@ -525,6 +520,8 @@ static int decode_sequence_header_adv(VC1Context *v, GetBitContext *gb)
 int ff_vc1_decode_entry_point(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb)
 {
     int i;
+    int w,h;
+    int ret;
 
     av_log(avctx, AV_LOG_DEBUG, "Entry point: %08X\n", show_bits_long(gb, 32));
     v->broken_link    = get_bits1(gb);
@@ -532,6 +529,8 @@ int ff_vc1_decode_entry_point(AVCodecContext *avctx, VC1Context *v, GetBitContex
     v->panscanflag    = get_bits1(gb);
     v->refdist_flag   = get_bits1(gb);
     v->s.loop_filter  = get_bits1(gb);
+    if (v->s.avctx->skip_loop_filter >= AVDISCARD_ALL)
+        v->s.loop_filter = 0;
     v->fastuvmc       = get_bits1(gb);
     v->extended_mv    = get_bits1(gb);
     v->dquant         = get_bits(gb, 2);
@@ -545,10 +544,18 @@ int ff_vc1_decode_entry_point(AVCodecContext *avctx, VC1Context *v, GetBitContex
         }
     }
 
-    if (get_bits1(gb)) {
-        avctx->width  = avctx->coded_width  = (get_bits(gb, 12) + 1) << 1;
-        avctx->height = avctx->coded_height = (get_bits(gb, 12) + 1) << 1;
+    if(get_bits1(gb)){
+        w = (get_bits(gb, 12)+1)<<1;
+        h = (get_bits(gb, 12)+1)<<1;
+    } else {
+        w = v->max_coded_width;
+        h = v->max_coded_height;
+    }
+    if ((ret = ff_set_dimensions(avctx, w, h)) < 0) {
+        av_log(avctx, AV_LOG_ERROR, "Failed to set dimensions %d %d\n", w, h);
+        return ret;
     }
+
     if (v->extended_mv)
         v->extended_dmv = get_bits1(gb);
     if ((v->range_mapy_flag = get_bits1(gb))) {
@@ -571,32 +578,73 @@ int ff_vc1_decode_entry_point(AVCodecContext *avctx, VC1Context *v, GetBitContex
 }
 
 /* fill lookup tables for intensity compensation */
-#define INIT_LUT(lumscale, lumshift, luty, lutuv) do { \
-    int scale, shift, i;                            \
-    if (!lumscale) {                                \
-        scale = -64;                                \
-        shift = (255 - lumshift * 2) << 6;          \
-        if (lumshift > 31)                          \
-            shift += 128 << 6;                      \
-    } else {                                        \
-        scale = lumscale + 32;                      \
-        if (lumshift > 31)                          \
-            shift = (lumshift - 64) << 6;           \
-        else                                        \
-            shift = lumshift << 6;                  \
-    }                                               \
-    for (i = 0; i < 256; i++) {                     \
-        luty[i]  = av_clip_uint8((scale * i + shift + 32) >> 6);           \
-        lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);  \
-    }                                               \
+#define INIT_LUT(lumscale, lumshift, luty, lutuv, chain) do {                 \
+        int scale, shift, i;                                                  \
+        if (!lumscale) {                                                      \
+            scale = -64;                                                      \
+            shift = (255 - lumshift * 2) << 6;                                \
+            if (lumshift > 31)                                                \
+                shift += 128 << 6;                                            \
+        } else {                                                              \
+            scale = lumscale + 32;                                            \
+            if (lumshift > 31)                                                \
+                shift = (lumshift - 64) << 6;                                 \
+            else                                                              \
+                shift = lumshift << 6;                                        \
+        }                                                                     \
+        for (i = 0; i < 256; i++) {                                           \
+            int iy = chain ? luty[i]  : i;                                    \
+            int iu = chain ? lutuv[i] : i;                                    \
+            luty[i]  = av_clip_uint8((scale * iy + shift + 32) >> 6);         \
+            lutuv[i] = av_clip_uint8((scale * (iu - 128) + 128*64 + 32) >> 6);\
+        }                                                                     \
     } while(0)
 
+static void rotate_luts(VC1Context *v)
+{
+#define ROTATE(DEF, L, N, C, A) do {                          \
+        if (v->s.pict_type == AV_PICTURE_TYPE_BI || v->s.pict_type == AV_PICTURE_TYPE_B) { \
+            C = A;                                            \
+        } else {                                              \
+            DEF;                                              \
+            memcpy(&tmp, L   , sizeof(tmp));                  \
+            memcpy(L   , N   , sizeof(tmp));                  \
+            memcpy(N   , &tmp, sizeof(tmp));                  \
+            C = N;                                            \
+        }                                                     \
+    } while(0)
+
+    ROTATE(int tmp,             &v->last_use_ic, &v->next_use_ic, v->curr_use_ic, &v->aux_use_ic);
+    ROTATE(uint8_t tmp[2][256], v->last_luty,   v->next_luty,   v->curr_luty,   v->aux_luty);
+    ROTATE(uint8_t tmp[2][256], v->last_lutuv,  v->next_lutuv,  v->curr_lutuv,  v->aux_lutuv);
+
+    INIT_LUT(32, 0, v->curr_luty[0], v->curr_lutuv[0], 0);
+    INIT_LUT(32, 0, v->curr_luty[1], v->curr_lutuv[1], 0);
+    *v->curr_use_ic = 0;
+}
+
+static int read_bfraction(VC1Context *v, GetBitContext* gb) {
+    int bfraction_lut_index = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);
+
+    if (bfraction_lut_index == 21 || bfraction_lut_index < 0) {
+        av_log(v->s.avctx, AV_LOG_ERROR, "bfraction invalid\n");
+        return AVERROR_INVALIDDATA;
+    }
+    v->bfraction_lut_index = bfraction_lut_index;
+    v->bfraction           = ff_vc1_bfraction_lut[v->bfraction_lut_index];
+    return 0;
+}
+
 int ff_vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
 {
     int pqindex, lowquant, status;
 
+    v->field_mode = 0;
+    v->fcm = 0;
     if (v->finterpflag)
         v->interpfrm = get_bits1(gb);
+    if (!v->s.avctx->codec)
+        return -1;
     if (v->s.avctx->codec_id == AV_CODEC_ID_MSS2)
         v->respic   =
         v->rangered =
@@ -620,8 +668,8 @@ int ff_vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
 
     v->bi_type = 0;
     if (v->s.pict_type == AV_PICTURE_TYPE_B) {
-        v->bfraction_lut_index = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);
-        v->bfraction           = ff_vc1_bfraction_lut[v->bfraction_lut_index];
+        if (read_bfraction(v, gb) < 0)
+            return AVERROR_INVALIDDATA;
         if (v->bfraction == 0) {
             v->s.pict_type = AV_PICTURE_TYPE_BI;
         }
@@ -677,8 +725,8 @@ int ff_vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
             (v->s.pict_type == AV_PICTURE_TYPE_P) ? 'P' : ((v->s.pict_type == AV_PICTURE_TYPE_I) ? 'I' : 'B'),
             pqindex, v->pq, v->halfpq, v->rangeredfrm);
 
-    if (v->s.pict_type == AV_PICTURE_TYPE_I || v->s.pict_type == AV_PICTURE_TYPE_P)
-        v->use_ic = 0;
+    if (v->first_pic_header_flag)
+        rotate_luts(v);
 
     switch (v->s.pict_type) {
     case AV_PICTURE_TYPE_P:
@@ -692,9 +740,10 @@ int ff_vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
             v->mv_mode2 = ff_vc1_mv_pmode_table2[lowquant][get_unary(gb, 1, 3)];
             v->lumscale = get_bits(gb, 6);
             v->lumshift = get_bits(gb, 6);
-            v->use_ic   = 1;
+            v->last_use_ic = 1;
             /* fill lookup tables for intensity compensation */
-            INIT_LUT(v->lumscale, v->lumshift, v->luty, v->lutuv);
+            INIT_LUT(v->lumscale, v->lumshift, v->last_luty[0], v->last_lutuv[0], 1);
+            INIT_LUT(v->lumscale, v->lumshift, v->last_luty[1], v->last_lutuv[1], 1);
         }
         v->qs_last = v->s.quarter_sample;
         if (v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)
@@ -812,12 +861,15 @@ int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
     int mbmodetab, imvtab, icbptab, twomvbptab, fourmvbptab; /* useful only for debugging */
     int field_mode, fcm;
 
+    v->numref          = 0;
     v->p_frame_skipped = 0;
     if (v->second_field) {
+        if(v->fcm!=2 || v->field_mode!=1)
+            return -1;
         v->s.pict_type = (v->fptype & 1) ? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I;
         if (v->fptype & 4)
             v->s.pict_type = (v->fptype & 1) ? AV_PICTURE_TYPE_BI : AV_PICTURE_TYPE_B;
-        v->s.current_picture_ptr->f.pict_type = v->s.pict_type;
+        v->s.current_picture_ptr->f->pict_type = v->s.pict_type;
         if (!v->pic_header_flag)
             goto parse_common_info;
     }
@@ -828,9 +880,6 @@ int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
         if (fcm) {
             if (fcm == ILACE_FIELD)
                 field_mode = 1;
-            if (!v->warn_interlaced++)
-                av_log(v->s.avctx, AV_LOG_ERROR,
-                       "Interlaced frames/fields support is incomplete\n");
         }
     } else {
         fcm = PROGRESSIVE;
@@ -840,12 +889,17 @@ int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
     v->field_mode = field_mode;
     v->fcm = fcm;
 
+    av_assert0(    v->s.mb_height == v->s.height + 15 >> 4
+                || v->s.mb_height == FFALIGN(v->s.height + 15 >> 4, 2));
     if (v->field_mode) {
+        v->s.mb_height = FFALIGN(v->s.height + 15 >> 4, 2);
         v->fptype = get_bits(gb, 3);
         v->s.pict_type = (v->fptype & 2) ? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I;
         if (v->fptype & 4) // B-picture
             v->s.pict_type = (v->fptype & 2) ? AV_PICTURE_TYPE_BI : AV_PICTURE_TYPE_B;
+
     } else {
+        v->s.mb_height = v->s.height + 15 >> 4;
         switch (get_unary(gb, 0, 4)) {
         case 0:
             v->s.pict_type = AV_PICTURE_TYPE_P;
@@ -874,6 +928,8 @@ int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
             v->tff = get_bits1(gb);
             v->rff = get_bits1(gb);
         }
+    } else {
+        v->tff = 1;
     }
     if (v->panscanflag) {
         avpriv_report_missing_feature(v->s.avctx, "Pan-scan");
@@ -885,6 +941,8 @@ int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
     v->rnd = get_bits1(gb);
     if (v->interlace)
         v->uvsamp = get_bits1(gb);
+    if(!ff_vc1_bfraction_vlc.table)
+        return 0; //parsing only, vlc tables havnt been allocated
     if (v->field_mode) {
         if (!v->refdist_flag)
             v->refdist = 0;
@@ -894,8 +952,8 @@ int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
                 v->refdist += get_unary(gb, 0, 16);
         }
         if ((v->s.pict_type == AV_PICTURE_TYPE_B) || (v->s.pict_type == AV_PICTURE_TYPE_BI)) {
-            v->bfraction_lut_index = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);
-            v->bfraction           = ff_vc1_bfraction_lut[v->bfraction_lut_index];
+            if (read_bfraction(v, gb) < 0)
+                return AVERROR_INVALIDDATA;
             v->frfd = (v->bfraction * v->refdist) >> 8;
             v->brfd = v->refdist - v->frfd - 1;
             if (v->brfd < 0)
@@ -907,8 +965,8 @@ int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
         if (v->finterpflag)
             v->interpfrm = get_bits1(gb);
         if (v->s.pict_type == AV_PICTURE_TYPE_B) {
-            v->bfraction_lut_index = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);
-            v->bfraction           = ff_vc1_bfraction_lut[v->bfraction_lut_index];
+            if (read_bfraction(v, gb) < 0)
+                return AVERROR_INVALIDDATA;
             if (v->bfraction == 0) {
                 v->s.pict_type = AV_PICTURE_TYPE_BI; /* XXX: should not happen here */
             }
@@ -942,12 +1000,12 @@ int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
     if (v->postprocflag)
         v->postproc = get_bits(gb, 2);
 
-    if (v->s.pict_type == AV_PICTURE_TYPE_I || v->s.pict_type == AV_PICTURE_TYPE_P)
-        v->use_ic = 0;
-
     if (v->parse_only)
         return 0;
 
+    if (v->first_pic_header_flag)
+        rotate_luts(v);
+
     switch (v->s.pict_type) {
     case AV_PICTURE_TYPE_I:
     case AV_PICTURE_TYPE_BI:
@@ -998,7 +1056,9 @@ int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
                 if (v->intcomp) {
                     v->lumscale = get_bits(gb, 6);
                     v->lumshift = get_bits(gb, 6);
-                    INIT_LUT(v->lumscale, v->lumshift, v->luty, v->lutuv);
+                    INIT_LUT(v->lumscale, v->lumshift, v->last_luty[0], v->last_lutuv[0], 1);
+                    INIT_LUT(v->lumscale, v->lumshift, v->last_luty[1], v->last_lutuv[1], 1);
+                    v->last_use_ic = 1;
                 }
                 status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);
                 av_log(v->s.avctx, AV_LOG_DEBUG, "SKIPMB plane encoding: "
@@ -1041,17 +1101,38 @@ int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
                 int mvmode2;
                 mvmode2 = get_unary(gb, 1, 3);
                 v->mv_mode2 = ff_vc1_mv_pmode_table2[lowquant][mvmode2];
-                if (v->field_mode)
-                    v->intcompfield = decode210(gb);
-                v->lumscale = get_bits(gb, 6);
-                v->lumshift = get_bits(gb, 6);
-                INIT_LUT(v->lumscale, v->lumshift, v->luty, v->lutuv);
-                if ((v->field_mode) && !v->intcompfield) {
+                if (v->field_mode) {
+                    v->intcompfield = decode210(gb) ^ 3;
+                } else
+                    v->intcompfield = 3;
+
+                v->lumscale2 = v->lumscale = 32;
+                v->lumshift2 = v->lumshift =  0;
+                if (v->intcompfield & 1) {
+                    v->lumscale = get_bits(gb, 6);
+                    v->lumshift = get_bits(gb, 6);
+                }
+                if ((v->intcompfield & 2) && v->field_mode) {
                     v->lumscale2 = get_bits(gb, 6);
                     v->lumshift2 = get_bits(gb, 6);
-                    INIT_LUT(v->lumscale2, v->lumshift2, v->luty2, v->lutuv2);
+                } else if(!v->field_mode) {
+                    v->lumscale2 = v->lumscale;
+                    v->lumshift2 = v->lumshift;
+                }
+                if (v->field_mode && v->second_field) {
+                    if (v->cur_field_type) {
+                        INIT_LUT(v->lumscale , v->lumshift , v->curr_luty[v->cur_field_type^1], v->curr_lutuv[v->cur_field_type^1], 0);
+                        INIT_LUT(v->lumscale2, v->lumshift2, v->last_luty[v->cur_field_type  ], v->last_lutuv[v->cur_field_type  ], 1);
+                    } else {
+                        INIT_LUT(v->lumscale2, v->lumshift2, v->curr_luty[v->cur_field_type^1], v->curr_lutuv[v->cur_field_type^1], 0);
+                        INIT_LUT(v->lumscale , v->lumshift , v->last_luty[v->cur_field_type  ], v->last_lutuv[v->cur_field_type  ], 1);
+                    }
+                    v->next_use_ic = *v->curr_use_ic = 1;
+                } else {
+                    INIT_LUT(v->lumscale , v->lumshift , v->last_luty[0], v->last_lutuv[0], 1);
+                    INIT_LUT(v->lumscale2, v->lumshift2, v->last_luty[1], v->last_lutuv[1], 1);
                 }
-                v->use_ic = 1;
+                v->last_use_ic = 1;
             }
             v->qs_last = v->s.quarter_sample;
             if (v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)
@@ -1129,12 +1210,11 @@ int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
         break;
     case AV_PICTURE_TYPE_B:
         if (v->fcm == ILACE_FRAME) {
-            v->bfraction_lut_index = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);
-            v->bfraction           = ff_vc1_bfraction_lut[v->bfraction_lut_index];
+            if (read_bfraction(v, gb) < 0)
+                return AVERROR_INVALIDDATA;
             if (v->bfraction == 0) {
                 return -1;
             }
-            return -1; // This codepath is still incomplete thus it is disabled
         }
         if (v->extended_mv)
             v->mvrange = get_unary(gb, 0, 3);
@@ -1154,6 +1234,7 @@ int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
 
         if (v->field_mode) {
             int mvmode;
+            av_log(v->s.avctx, AV_LOG_DEBUG, "B Fields\n");
             if (v->extended_dmv)
                 v->dmvrange = get_unary(gb, 0, 3);
             mvmode = get_unary(gb, 1, 3);
@@ -1635,5 +1716,7 @@ av_cold int ff_vc1_init_common(VC1Context *v)
     v->pq      = -1;
     v->mvrange = 0; /* 7.1.1.18, p80 */
 
+    ff_vc1dsp_init(&v->vc1dsp);
+
     return 0;
 }