Merge commit 'fa6eef4210c2fd7f7324d558b09311c75987a31e' into release/1.1

* commit 'fa6eef4210c2fd7f7324d558b09311c75987a31e':
  wtv: Mark attachment with a negative stream id
  avconv: do not use lavfi direct rendering with -deinterlace
  avidec: Let the inner dv demuxer take care of discarding
  Update Changelog
  kmvc: Clip pixel position to valid range
  kmvc: use fixed sized arrays in the context
  indeo: reject negative array indexes
  indeo: Cosmetic formatting
  indeo: Refactor ff_ivi_init_tiles and ivi_decode_blocks
  indeo: Refactor ff_ivi_dec_huff_desc
  indeo: use a typedef for the mc function pointer
  indeo: use proper error code

Conflicts:
	Changelog
	ffmpeg.c
	libavcodec/ivi_common.c
	libavformat/wtv.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 251 insertions, 187 deletions

diff --git a/libavcodec/ivi_common.c b/libavcodec/ivi_common.c
index afcbe07c25..d083c3643a 100644
--- a/libavcodec/ivi_common.c
+++ b/libavcodec/ivi_common.c
@@ -41,6 +41,23 @@ extern const IVIHuffDesc ff_ivi_blk_huff_desc[8]; ///< static block huffman tabl
 static VLC ivi_mb_vlc_tabs [8]; ///< static macroblock Huffman tables
 static VLC ivi_blk_vlc_tabs[8]; ///< static block Huffman tables
 
+typedef void (*ivi_mc_func) (int16_t *buf, const int16_t *ref_buf,
+                             uint32_t pitch, int mc_type);
+
+static int ivi_mc(ivi_mc_func mc, int16_t *buf, const int16_t *ref_buf,
+                  int offs, int mv_x, int mv_y, uint32_t pitch,
+                  int mc_type)
+{
+    int ref_offs = offs + mv_y * pitch + mv_x;
+
+    if (offs < 0 || ref_offs < 0 || !ref_buf)
+        return AVERROR_INVALIDDATA;
+
+    mc(buf + offs, ref_buf + ref_offs, pitch, mc_type);
+
+    return 0;
+}
+
 /**
  *  Reverse "nbits" bits of the value "val" and return the result
  *  in the least significant bits.
@@ -50,9 +67,10 @@ static uint16_t inv_bits(uint16_t val, int nbits)
     uint16_t res;
 
     if (nbits <= 8) {
-        res = ff_reverse[val] >> (8-nbits);
+        res = ff_reverse[val] >> (8 - nbits);
     } else
-        res = ((ff_reverse[val & 0xFF] << 8) + (ff_reverse[val >> 8])) >> (16-nbits);
+        res = ((ff_reverse[val & 0xFF] << 8) +
+               (ff_reverse[val >> 8])) >> (16 - nbits);
 
     return res;
 }
@@ -111,10 +129,12 @@ void ff_ivi_init_static_vlc(void)
     for (i = 0; i < 8; i++) {
         ivi_mb_vlc_tabs[i].table = table_data + i * 2 * 8192;
         ivi_mb_vlc_tabs[i].table_allocated = 8192;
-        ivi_create_huff_from_desc(&ff_ivi_mb_huff_desc[i],  &ivi_mb_vlc_tabs[i],  1);
+        ivi_create_huff_from_desc(&ff_ivi_mb_huff_desc[i],
+                                  &ivi_mb_vlc_tabs[i], 1);
         ivi_blk_vlc_tabs[i].table = table_data + (i * 2 + 1) * 8192;
         ivi_blk_vlc_tabs[i].table_allocated = 8192;
-        ivi_create_huff_from_desc(&ff_ivi_blk_huff_desc[i], &ivi_blk_vlc_tabs[i], 1);
+        ivi_create_huff_from_desc(&ff_ivi_blk_huff_desc[i],
+                                  &ivi_blk_vlc_tabs[i], 1);
     }
     initialized_vlcs = 1;
 }
@@ -138,56 +158,59 @@ static void ivi_huff_desc_copy(IVIHuffDesc *dst, const IVIHuffDesc *src)
  *  @param[in]  desc2  ptr to the 2nd descriptor to compare
  *  @return         comparison result: 0 - equal, 1 - not equal
  */
-static int ivi_huff_desc_cmp(const IVIHuffDesc *desc1, const IVIHuffDesc *desc2)
+static int ivi_huff_desc_cmp(const IVIHuffDesc *desc1,
+                             const IVIHuffDesc *desc2)
 {
-    return    desc1->num_rows != desc2->num_rows
-           || memcmp(desc1->xbits, desc2->xbits, desc1->num_rows);
+    return desc1->num_rows != desc2->num_rows ||
+           memcmp(desc1->xbits, desc2->xbits, desc1->num_rows);
 }
 
 int ff_ivi_dec_huff_desc(GetBitContext *gb, int desc_coded, int which_tab,
                          IVIHuffTab *huff_tab, AVCodecContext *avctx)
 {
-    int         i, result;
+    int i, result;
     IVIHuffDesc new_huff;
 
     if (!desc_coded) {
         /* select default table */
         huff_tab->tab = (which_tab) ? &ivi_blk_vlc_tabs[7]
-            : &ivi_mb_vlc_tabs [7];
-    } else {
-        huff_tab->tab_sel = get_bits(gb, 3);
-        if (huff_tab->tab_sel == 7) {
-            /* custom huffman table (explicitly encoded) */
-            new_huff.num_rows = get_bits(gb, 4);
-            if (!new_huff.num_rows) {
-                av_log(avctx, AV_LOG_ERROR, "Empty custom Huffman table!\n");
-                return AVERROR_INVALIDDATA;
-            }
+                                    : &ivi_mb_vlc_tabs [7];
+        return 0;
+    }
 
-            for (i = 0; i < new_huff.num_rows; i++)
-                new_huff.xbits[i] = get_bits(gb, 4);
+    huff_tab->tab_sel = get_bits(gb, 3);
+    if (huff_tab->tab_sel == 7) {
+        /* custom huffman table (explicitly encoded) */
+        new_huff.num_rows = get_bits(gb, 4);
+        if (!new_huff.num_rows) {
+            av_log(avctx, AV_LOG_ERROR, "Empty custom Huffman table!\n");
+            return AVERROR_INVALIDDATA;
+        }
 
-            /* Have we got the same custom table? Rebuild if not. */
-            if (ivi_huff_desc_cmp(&new_huff, &huff_tab->cust_desc) || !huff_tab->cust_tab.table) {
-                ivi_huff_desc_copy(&huff_tab->cust_desc, &new_huff);
+        for (i = 0; i < new_huff.num_rows; i++)
+            new_huff.xbits[i] = get_bits(gb, 4);
 
-                if (huff_tab->cust_tab.table)
-                    ff_free_vlc(&huff_tab->cust_tab);
-                result = ivi_create_huff_from_desc(&huff_tab->cust_desc,
-                        &huff_tab->cust_tab, 0);
-                if (result) {
-                    huff_tab->cust_desc.num_rows = 0; // reset faulty description
-                    av_log(avctx, AV_LOG_ERROR,
-                           "Error while initializing custom vlc table!\n");
-                    return result;
-                }
+        /* Have we got the same custom table? Rebuild if not. */
+        if (ivi_huff_desc_cmp(&new_huff, &huff_tab->cust_desc) || !huff_tab->cust_tab.table) {
+            ivi_huff_desc_copy(&huff_tab->cust_desc, &new_huff);
+
+            if (huff_tab->cust_tab.table)
+                ff_free_vlc(&huff_tab->cust_tab);
+            result = ivi_create_huff_from_desc(&huff_tab->cust_desc,
+                    &huff_tab->cust_tab, 0);
+            if (result) {
+                // reset faulty description
+                huff_tab->cust_desc.num_rows = 0;
+                av_log(avctx, AV_LOG_ERROR,
+                       "Error while initializing custom vlc table!\n");
+                return result;
             }
-            huff_tab->tab = &huff_tab->cust_tab;
-        } else {
-            /* select one of predefined tables */
-            huff_tab->tab = (which_tab) ? &ivi_blk_vlc_tabs[huff_tab->tab_sel]
-                : &ivi_mb_vlc_tabs [huff_tab->tab_sel];
         }
+        huff_tab->tab = &huff_tab->cust_tab;
+    } else {
+        /* select one of predefined tables */
+        huff_tab->tab = (which_tab) ? &ivi_blk_vlc_tabs[huff_tab->tab_sel]
+            : &ivi_mb_vlc_tabs [huff_tab->tab_sel];
     }
 
     return 0;
@@ -221,8 +244,9 @@ static av_cold void ivi_free_buffers(IVIPlaneDesc *planes)
 
 av_cold int ff_ivi_init_planes(IVIPlaneDesc *planes, const IVIPicConfig *cfg)
 {
-    int         p, b;
-    uint32_t    b_width, b_height, align_fac, width_aligned, height_aligned, buf_size;
+    int p, b;
+    uint32_t b_width, b_height, align_fac, width_aligned,
+             height_aligned, buf_size;
     IVIBandDesc *band;
 
     ivi_free_buffers(planes);
@@ -245,8 +269,10 @@ av_cold int ff_ivi_init_planes(IVIPlaneDesc *planes, const IVIPicConfig *cfg)
         /* select band dimensions: if there is only one band then it
          *  has the full size, if there are several bands each of them
          *  has only half size */
-        b_width  = planes[p].num_bands == 1 ? planes[p].width  : (planes[p].width  + 1) >> 1;
-        b_height = planes[p].num_bands == 1 ? planes[p].height : (planes[p].height + 1) >> 1;
+        b_width  = planes[p].num_bands == 1 ? planes[p].width
+                                            : (planes[p].width  + 1) >> 1;
+        b_height = planes[p].num_bands == 1 ? planes[p].height
+                                            : (planes[p].height + 1) >> 1;
 
         /* luma   band buffers will be aligned on 16x16 (max macroblock size) */
         /* chroma band buffers will be aligned on   8x8 (max macroblock size) */
@@ -275,19 +301,54 @@ av_cold int ff_ivi_init_planes(IVIPlaneDesc *planes, const IVIPicConfig *cfg)
                 if (!band->bufs[2])
                     return AVERROR(ENOMEM);
             }
+            /* reset custom vlc */
+            planes[p].bands[0].blk_vlc.cust_desc.num_rows = 0;
+        }
+    }
+
+    return 0;
+}
 
-            planes[p].bands[0].blk_vlc.cust_desc.num_rows = 0; /* reset custom vlc */
+static int ivi_init_tiles(IVIBandDesc *band, IVITile *ref_tile,
+                          int p, int b, int t_height, int t_width)
+{
+    int x, y;
+    IVITile *tile = band->tiles;
+
+    for (y = 0; y < band->height; y += t_height) {
+        for (x = 0; x < band->width; x += t_width) {
+            tile->xpos     = x;
+            tile->ypos     = y;
+            tile->mb_size  = band->mb_size;
+            tile->width    = FFMIN(band->width - x,  t_width);
+            tile->height   = FFMIN(band->height - y, t_height);
+            tile->is_empty = tile->data_size = 0;
+            /* calculate number of macroblocks */
+            tile->num_MBs  = IVI_MBs_PER_TILE(tile->width, tile->height,
+                                              band->mb_size);
+
+            av_freep(&tile->mbs);
+            tile->mbs = av_malloc(tile->num_MBs * sizeof(IVIMbInfo));
+            if (!tile->mbs)
+                return AVERROR(ENOMEM);
+
+            tile->ref_mbs = 0;
+            if (p || b) {
+                tile->ref_mbs = ref_tile->mbs;
+                ref_tile++;
+            }
+            tile++;
         }
     }
 
     return 0;
 }
 
-av_cold int ff_ivi_init_tiles(IVIPlaneDesc *planes, int tile_width, int tile_height)
+av_cold int ff_ivi_init_tiles(IVIPlaneDesc *planes,
+                              int tile_width, int tile_height)
 {
-    int         p, b, x, y, x_tiles, y_tiles, t_width, t_height;
+    int p, b, x_tiles, y_tiles, t_width, t_height, ret;
     IVIBandDesc *band;
-    IVITile     *tile, *ref_tile;
 
     for (p = 0; p < 3; p++) {
         t_width  = !p ? tile_width  : (tile_width  + 3) >> 2;
@@ -311,44 +372,14 @@ av_cold int ff_ivi_init_tiles(IVIPlaneDesc *planes, int tile_width, int tile_hei
             if (!band->tiles)
                 return AVERROR(ENOMEM);
 
-            tile = band->tiles;
-
             /* use the first luma band as reference for motion vectors
              * and quant */
-            ref_tile = planes[0].bands[0].tiles;
-
-            for (y = 0; y < band->height; y += t_height) {
-                for (x = 0; x < band->width; x += t_width) {
-                    tile->xpos     = x;
-                    tile->ypos     = y;
-                    tile->mb_size  = band->mb_size;
-                    tile->width    = FFMIN(band->width - x,  t_width);
-                    tile->height   = FFMIN(band->height - y, t_height);
-                    tile->is_empty = tile->data_size = 0;
-                    /* calculate number of macroblocks */
-                    tile->num_MBs  = IVI_MBs_PER_TILE(tile->width, tile->height,
-                                                      band->mb_size);
-
-                    av_freep(&tile->mbs);
-                    tile->mbs = av_malloc(tile->num_MBs * sizeof(IVIMbInfo));
-                    if (!tile->mbs)
-                        return AVERROR(ENOMEM);
-
-                    tile->ref_mbs = 0;
-                    if (p || b) {
-                        if (tile->num_MBs <= ref_tile->num_MBs) {
-                            tile->ref_mbs = ref_tile->mbs;
-                        }else
-                            av_log(NULL, AV_LOG_DEBUG, "Cannot use ref_tile, too few mbs\n");
-                        ref_tile++;
-                    }
-
-                    tile++;
-                }
-            }
-
-        }// for b
-    }// for p
+            ret = ivi_init_tiles(band, planes[0].bands[0].tiles,
+                                 p, b, t_height, t_width);
+            if (ret < 0)
+                return ret;
+        }
+    }
 
     return 0;
 }
@@ -380,6 +411,98 @@ static int ivi_dec_tile_data_size(GetBitContext *gb)
     return len;
 }
 
+
+static int ivi_decode_coded_blocks(GetBitContext *gb, IVIBandDesc *band,
+                                   ivi_mc_func mc, int mv_x, int mv_y,
+                                   int *prev_dc, int is_intra, int mc_type,
+                                   uint32_t quant, int offs,
+                                   AVCodecContext *avctx)
+{
+    const uint16_t *base_tab  = is_intra ? band->intra_base : band->inter_base;
+    RVMapDesc *rvmap = band->rv_map;
+    uint8_t col_flags[8];
+    int32_t trvec[64];
+    uint32_t sym = 0, lo, hi, q;
+    int pos, run, val;
+    int blk_size   = band->blk_size;
+    int num_coeffs = blk_size * blk_size;
+    int col_mask   = blk_size - 1;
+    int scan_pos   = -1;
+
+    if (!band->scan) {
+        av_log(avctx, AV_LOG_ERROR, "Scan pattern is not set.\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    /* zero transform vector */
+    memset(trvec, 0, num_coeffs * sizeof(trvec[0]));
+    /* zero column flags */
+    memset(col_flags, 0, sizeof(col_flags));
+    while (scan_pos <= num_coeffs) {
+        sym = get_vlc2(gb, band->blk_vlc.tab->table,
+                       IVI_VLC_BITS, 1);
+        if (sym == rvmap->eob_sym)
+            break; /* End of block */
+
+        /* Escape - run/val explicitly coded using 3 vlc codes */
+        if (sym == rvmap->esc_sym) {
+            run = get_vlc2(gb, band->blk_vlc.tab->table, IVI_VLC_BITS, 1) + 1;
+            lo  = get_vlc2(gb, band->blk_vlc.tab->table, IVI_VLC_BITS, 1);
+            hi  = get_vlc2(gb, band->blk_vlc.tab->table, IVI_VLC_BITS, 1);
+            /* merge them and convert into signed val */
+            val = IVI_TOSIGNED((hi << 6) | lo);
+        } else {
+            if (sym >= 256U) {
+                av_log(avctx, AV_LOG_ERROR, "Invalid sym encountered: %d.\n", sym);
+                return AVERROR_INVALIDDATA;
+            }
+            run = rvmap->runtab[sym];
+            val = rvmap->valtab[sym];
+        }
+
+        /* de-zigzag and dequantize */
+        scan_pos += run;
+        if (scan_pos >= num_coeffs || scan_pos < 0)
+            break;
+        pos = band->scan[scan_pos];
+
+        if (!val)
+            av_dlog(avctx, "Val = 0 encountered!\n");
+
+        q = (base_tab[pos] * quant) >> 9;
+        if (q > 1)
+            val = val * q + FFSIGN(val) * (((q ^ 1) - 1) >> 1);
+        trvec[pos] = val;
+        /* track columns containing non-zero coeffs */
+        col_flags[pos & col_mask] |= !!val;
+    }
+
+    if (scan_pos < 0 || scan_pos >= num_coeffs && sym != rvmap->eob_sym)
+        return AVERROR_INVALIDDATA; /* corrupt block data */
+
+    /* undoing DC coeff prediction for intra-blocks */
+    if (is_intra && band->is_2d_trans) {
+        *prev_dc     += trvec[0];
+        trvec[0]      = *prev_dc;
+        col_flags[0] |= !!*prev_dc;
+    }
+
+    if(band->transform_size > band->blk_size){
+        av_log(NULL, AV_LOG_ERROR, "Too large transform\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    /* apply inverse transform */
+    band->inv_transform(trvec, band->buf + offs,
+                        band->pitch, col_flags);
+
+    /* apply motion compensation */
+    if (!is_intra)
+        return ivi_mc(mc, band->buf, band->ref_buf, offs, mv_x, mv_y,
+                      band->pitch, mc_type);
+
+    return 0;
+}
 /*
  *  Decode block data:
  *  extract huffman-coded transform coefficients from the bitstream,
@@ -391,27 +514,22 @@ static int ivi_dec_tile_data_size(GetBitContext *gb)
  *  @param[in]      tile  pointer to the tile descriptor
  *  @return     result code: 0 - OK, -1 = error (corrupted blocks data)
  */
-static int ivi_decode_blocks(GetBitContext *gb, IVIBandDesc *band, IVITile *tile,
-                             AVCodecContext *avctx)
+static int ivi_decode_blocks(GetBitContext *gb, IVIBandDesc *band,
+                             IVITile *tile, AVCodecContext *avctx)
 {
-    int         mbn, blk, num_blocks, num_coeffs, blk_size, scan_pos, run, val,
-                pos, is_intra, mc_type = 0, av_uninit(mv_x), av_uninit(mv_y), col_mask;
-    uint8_t     col_flags[8];
-    int32_t     prev_dc, trvec[64];
-    uint32_t    cbp, av_uninit(sym), lo, hi, quant, buf_offs, q;
-    IVIMbInfo   *mb;
-    RVMapDesc   *rvmap = band->rv_map;
-    void (*mc_with_delta_func)(int16_t *buf, const int16_t *ref_buf, uint32_t pitch, int mc_type);
-    void (*mc_no_delta_func)  (int16_t *buf, const int16_t *ref_buf, uint32_t pitch, int mc_type);
-    const uint16_t  *base_tab;
-    const uint8_t   *scale_tab;
-
-    prev_dc = 0; /* init intra prediction for the DC coefficient */
-
+    int mbn, blk, num_blocks, blk_size, ret, is_intra, mc_type = 0;
+    int mv_x = 0, mv_y = 0;
+    int32_t prev_dc;
+    uint32_t cbp, quant, buf_offs;
+    IVIMbInfo *mb;
+    ivi_mc_func mc_with_delta_func, mc_no_delta_func;
+    const uint8_t *scale_tab;
+
+    /* init intra prediction for the DC coefficient */
+    prev_dc    = 0;
     blk_size   = band->blk_size;
-    col_mask   = blk_size - 1; /* column mask for tracking non-zero coeffs */
-    num_blocks = (band->mb_size != blk_size) ? 4 : 1; /* number of blocks per mb */
-    num_coeffs = blk_size * blk_size;
+    /* number of blocks per mb */
+    num_blocks = (band->mb_size != blk_size) ? 4 : 1;
     if (blk_size == 8) {
         mc_with_delta_func = ff_ivi_mc_8x8_delta;
         mc_no_delta_func   = ff_ivi_mc_8x8_no_delta;
@@ -427,7 +545,6 @@ static int ivi_decode_blocks(GetBitContext *gb, IVIBandDesc *band, IVITile *tile
 
         quant = av_clip(band->glob_quant + mb->q_delta, 0, 23);
 
-        base_tab  = is_intra ? band->intra_base  : band->inter_base;
         scale_tab = is_intra ? band->intra_scale : band->inter_scale;
         if (scale_tab)
             quant = scale_tab[quant];
@@ -448,10 +565,10 @@ static int ivi_decode_blocks(GetBitContext *gb, IVIBandDesc *band, IVITile *tile
                 cx    = mb->mv_x &  band->is_halfpel;
                 cy    = mb->mv_y &  band->is_halfpel;
 
-                if (   mb->xpos + dmv_x < 0
-                    || mb->xpos + dmv_x + band->mb_size + cx > band->pitch
-                    || mb->ypos + dmv_y < 0
-                    || mb->ypos + dmv_y + band->mb_size + cy > band->aheight) {
+                if (mb->xpos + dmv_x < 0 ||
+                    mb->xpos + dmv_x + band->mb_size + cx > band->pitch ||
+                    mb->ypos + dmv_y < 0 ||
+                    mb->ypos + dmv_y + band->mb_size + cy > band->aheight) {
                     return AVERROR_INVALIDDATA;
                 }
             }
@@ -467,72 +584,12 @@ static int ivi_decode_blocks(GetBitContext *gb, IVIBandDesc *band, IVITile *tile
             }
 
             if (cbp & 1) { /* block coded ? */
-                if (!band->scan) {
-                    av_log(avctx, AV_LOG_ERROR, "Scan pattern is not set.\n");
-                    return AVERROR_INVALIDDATA;
-                }
-
-                scan_pos = -1;
-                memset(trvec, 0, num_coeffs*sizeof(trvec[0])); /* zero transform vector */
-                memset(col_flags, 0, sizeof(col_flags));      /* zero column flags */
-
-                while (scan_pos <= num_coeffs) {
-                    sym = get_vlc2(gb, band->blk_vlc.tab->table, IVI_VLC_BITS, 1);
-                    if (sym == rvmap->eob_sym)
-                        break; /* End of block */
-
-                    if (sym == rvmap->esc_sym) { /* Escape - run/val explicitly coded using 3 vlc codes */
-                        run = get_vlc2(gb, band->blk_vlc.tab->table, IVI_VLC_BITS, 1) + 1;
-                        lo  = get_vlc2(gb, band->blk_vlc.tab->table, IVI_VLC_BITS, 1);
-                        hi  = get_vlc2(gb, band->blk_vlc.tab->table, IVI_VLC_BITS, 1);
-                        val = IVI_TOSIGNED((hi << 6) | lo); /* merge them and convert into signed val */
-                    } else {
-                        if (sym >= 256U) {
-                            av_log(avctx, AV_LOG_ERROR, "Invalid sym encountered: %d.\n", sym);
-                            return AVERROR_INVALIDDATA;
-                        }
-                        run = rvmap->runtab[sym];
-                        val = rvmap->valtab[sym];
-                    }
 
-                    /* de-zigzag and dequantize */
-                    scan_pos += run;
-                    if (scan_pos >= (unsigned)num_coeffs)
-                        break;
-                    pos = band->scan[scan_pos];
-
-                    if (!val)
-                        av_dlog(avctx, "Val = 0 encountered!\n");
-
-                    q = (base_tab[pos] * quant) >> 9;
-                    if (q > 1)
-                        val = val * q + FFSIGN(val) * (((q ^ 1) - 1) >> 1);
-                    trvec[pos] = val;
-                    col_flags[pos & col_mask] |= !!val; /* track columns containing non-zero coeffs */
-                }// while
-
-                if (scan_pos >= num_coeffs && sym != rvmap->eob_sym)
-                    return AVERROR_INVALIDDATA; /* corrupt block data */
-
-                /* undoing DC coeff prediction for intra-blocks */
-                if (is_intra && band->is_2d_trans) {
-                    prev_dc      += trvec[0];
-                    trvec[0]      = prev_dc;
-                    col_flags[0] |= !!prev_dc;
-                }
-                if(band->transform_size > band->blk_size){
-                    av_log(NULL, AV_LOG_ERROR, "Too large transform\n");
-                    return AVERROR_INVALIDDATA;
-                }
-                /* apply inverse transform */
-                band->inv_transform(trvec, band->buf + buf_offs,
-                                    band->pitch, col_flags);
-
-                /* apply motion compensation */
-                if (!is_intra)
-                    mc_with_delta_func(band->buf + buf_offs,
-                                       band->ref_buf + buf_offs + mv_y * band->pitch + mv_x,
-                                       band->pitch, mc_type);
+                ret = ivi_decode_coded_blocks(gb, band, mc_with_delta_func,
+                                              mv_x, mv_y, &prev_dc, is_intra,
+                                              mc_type, quant, buf_offs, avctx);
+                if (ret < 0)
+                    return ret;
             } else {
                 /* block not coded */
                 /* for intra blocks apply the dc slant transform */
@@ -540,10 +597,12 @@ static int ivi_decode_blocks(GetBitContext *gb, IVIBandDesc *band, IVITile *tile
                 if (is_intra) {
                     band->dc_transform(&prev_dc, band->buf + buf_offs,
                                        band->pitch, blk_size);
-                } else
-                    mc_no_delta_func(band->buf + buf_offs,
-                                     band->ref_buf + buf_offs + mv_y * band->pitch + mv_x,
-                                     band->pitch, mc_type);
+                } else {
+                    ret = ivi_mc(mc_no_delta_func, band->buf, band->ref_buf,
+                                 buf_offs, mv_x, mv_y, band->pitch, mc_type);
+                    if (ret < 0)
+                        return ret;
+                }
             }
 
             cbp >>= 1;
@@ -568,12 +627,11 @@ static int ivi_process_empty_tile(AVCodecContext *avctx, IVIBandDesc *band,
                                   IVITile *tile, int32_t mv_scale)
 {
     int             x, y, need_mc, mbn, blk, num_blocks, mv_x, mv_y, mc_type;
-    int             offs, mb_offset, row_offset;
+    int             offs, mb_offset, row_offset, ret;
     IVIMbInfo       *mb, *ref_mb;
     const int16_t   *src;
     int16_t         *dst;
-    void (*mc_no_delta_func)(int16_t *buf, const int16_t *ref_buf, uint32_t pitch,
-                             int mc_type);
+    ivi_mc_func     mc_no_delta_func;
 
     if (tile->num_MBs != IVI_MBs_PER_TILE(tile->width, tile->height, band->mb_size)) {
         av_log(avctx, AV_LOG_ERROR, "Allocated tile size %d mismatches "
@@ -663,9 +721,10 @@ static int ivi_process_empty_tile(AVCodecContext *avctx, IVIBandDesc *band,
             for (blk = 0; blk < num_blocks; blk++) {
                 /* adjust block position in the buffer according with its number */
                 offs = mb->buf_offs + band->blk_size * ((blk & 1) + !!(blk & 2) * band->pitch);
-                mc_no_delta_func(band->buf + offs,
-                                 band->ref_buf + offs + mv_y * band->pitch + mv_x,
-                                 band->pitch, mc_type);
+                ret = ivi_mc(mc_no_delta_func, band->buf, band->ref_buf,
+                             offs, mv_x, mv_y, band->pitch, mc_type);
+                if (ret < 0)
+                    return ret;
             }
         }
     } else {
@@ -821,7 +880,8 @@ static int decode_band(IVI45DecContext *ctx,
         }
     }
 
-    /* restore the selected rvmap table by applying its corrections in reverse order */
+    /* restore the selected rvmap table by applying its corrections in
+     * reverse order */
     for (i = band->num_corr-1; i >= 0; i--) {
         idx1 = band->corr[i*2];
         idx2 = band->corr[i*2+1];
@@ -838,7 +898,8 @@ static int decode_band(IVI45DecContext *ctx,
         uint16_t chksum = ivi_calc_band_checksum(band);
         if (chksum != band->checksum) {
             av_log(avctx, AV_LOG_ERROR,
-                   "Band checksum mismatch! Plane %d, band %d, received: %x, calculated: %x\n",
+                   "Band checksum mismatch! Plane %d, band %d, "
+                   "received: %x, calculated: %x\n",
                    band->plane, band->band_num, band->checksum, chksum);
         }
     }
@@ -898,10 +959,13 @@ int ff_ivi_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
 
     //STOP_TIMER("decode_planes"); }
 
-    /* If the bidirectional mode is enabled, next I and the following P frame will */
-    /* be sent together. Unfortunately the approach below seems to be the only way */
-    /* to handle the B-frames mode. That's exactly the same Intel decoders do.     */
-    if (avctx->codec_id == AV_CODEC_ID_INDEO4 && ctx->frame_type == 0/*FRAMETYPE_INTRA*/) {
+    /* If the bidirectional mode is enabled, next I and the following P
+     * frame will be sent together. Unfortunately the approach below seems
+     * to be the only way to handle the B-frames mode.
+     * That's exactly the same Intel decoders do.
+     */
+    if (avctx->codec_id == AV_CODEC_ID_INDEO4 &&
+        ctx->frame_type == 0/*FRAMETYPE_INTRA*/) {
         while (get_bits(&ctx->gb, 8)); // skip version string
         skip_bits_long(&ctx->gb, 64);  // skip padding, TODO: implement correct 8-bytes alignment
         if (get_bits_left(&ctx->gb) > 18 && show_bits(&ctx->gb, 18) == 0x3FFF8)