Indeo 5 decoder

Originally committed as revision 21695 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 885 insertions, 0 deletions

diff --git a/libavcodec/indeo5.c b/libavcodec/indeo5.c
new file mode 100644
index 0000000000..c0534cb98f
--- /dev/null
+++ b/libavcodec/indeo5.c
@@ -0,0 +1,885 @@
+/*
+ * Indeo Video Interactive v5 compatible decoder
+ * Copyright (c) 2009 Maxim Poliakovski
+ *
+ * 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 libavcodec/indeo5.c
+ * Indeo Video Interactive version 5 decoder
+ *
+ * Indeo5 data is usually transported within .avi or .mov files.
+ * Known FOURCCs: 'IV50'
+ */
+
+#define ALT_BITSTREAM_READER_LE
+#include "avcodec.h"
+#include "get_bits.h"
+#include "ivi_dsp.h"
+#include "ivi_common.h"
+#include "indeo5data.h"
+
+/**
+ *  Indeo5 frame types.
+ */
+enum {
+    FRAMETYPE_INTRA       = 0,
+    FRAMETYPE_INTER       = 1,  ///< non-droppable P-frame
+    FRAMETYPE_INTER_SCAL  = 2,  ///< droppable P-frame used in the scalability mode
+    FRAMETYPE_INTER_NOREF = 3,  ///< droppable P-frame
+    FRAMETYPE_NULL        = 4   ///< empty frame with no data
+};
+
+#define IVI5_PIC_SIZE_ESC       15
+
+#define IVI5_IS_PROTECTED       0x20
+
+typedef struct {
+    GetBitContext   gb;
+    AVFrame         frame;
+    RVMapDesc       rvmap_tabs[9];   ///< local corrected copy of the static rvmap tables
+    IVIPlaneDesc    planes[3];       ///< color planes
+    const uint8_t   *frame_data;     ///< input frame data pointer
+    int             buf_switch;      ///< used to switch between three buffers
+    int             dst_buf;
+    int             ref_buf;
+    uint32_t        frame_size;      ///< frame size in bytes
+    int             frame_type;
+    int             prev_frame_type; ///< frame type of the previous frame
+    int             frame_num;
+    uint32_t        pic_hdr_size;    ///< picture header size in bytes
+    uint8_t         frame_flags;
+    uint16_t        checksum;        ///< frame checksum
+
+    int16_t         mb_huff_sel;     ///< MB huffman table selector
+    IVIHuffDesc     mb_huff_desc;    ///< MB table descriptor associated with the selector above
+    VLC             *mb_vlc;         ///< ptr to the vlc table for decoding macroblock data
+    VLC             mb_vlc_cust;     ///< custom macroblock vlc table
+
+    uint16_t        gop_hdr_size;
+    uint8_t         gop_flags;
+    int             is_scalable;
+    uint32_t        lock_word;
+    IVIPicConfig    pic_conf;
+} IVI5DecContext;
+
+//! static vlc tables (initialized at startup)
+static VLC mb_vlc_tabs [8];
+static VLC blk_vlc_tabs[8];
+
+
+/**
+ *  Decodes Indeo5 GOP (Group of pictures) header.
+ *  This header is present in key frames only.
+ *  It defines parameters for all frames in a GOP.
+ *
+ *  @param ctx      [in,out] ptr to the decoder context
+ *  @param avctx    [in] ptr to the AVCodecContext
+ *  @return         result code: 0 = OK, -1 = error
+ */
+static int decode_gop_header(IVI5DecContext *ctx, AVCodecContext *avctx)
+{
+    int             result, i, p, tile_size, pic_size_indx, mb_size, blk_size, blk_size_changed = 0;
+    IVIBandDesc     *band, *band1, *band2;
+    IVIPicConfig    pic_conf;
+
+    ctx->gop_flags = get_bits(&ctx->gb, 8);
+
+    ctx->gop_hdr_size = (ctx->gop_flags & 1) ? get_bits(&ctx->gb, 16) : 0;
+
+    if (ctx->gop_flags & IVI5_IS_PROTECTED)
+        ctx->lock_word = get_bits_long(&ctx->gb, 32);
+
+    tile_size = (ctx->gop_flags & 0x40) ? 64 << get_bits(&ctx->gb, 2) : 0;
+    if (tile_size > 256) {
+        av_log(avctx, AV_LOG_ERROR, "Invalid tile size: %d\n", tile_size);
+        return -1;
+    }
+
+    /* decode number of wavelet bands */
+    /* num_levels * 3 + 1 */
+    pic_conf.luma_bands   = get_bits(&ctx->gb, 2) * 3 + 1;
+    pic_conf.chroma_bands = get_bits1(&ctx->gb)   * 3 + 1;
+    ctx->is_scalable = pic_conf.luma_bands != 1 || pic_conf.chroma_bands != 1;
+    if (ctx->is_scalable && (pic_conf.luma_bands != 4 || pic_conf.chroma_bands != 1)) {
+        av_log(avctx, AV_LOG_ERROR, "Scalability: unsupported subdivision! Luma bands: %d, chroma bands: %d\n",
+               pic_conf.luma_bands, pic_conf.chroma_bands);
+        return -1;
+    }
+
+    pic_size_indx = get_bits(&ctx->gb, 4);
+    if (pic_size_indx == IVI5_PIC_SIZE_ESC) {
+        pic_conf.pic_height = get_bits(&ctx->gb, 13);
+        pic_conf.pic_width  = get_bits(&ctx->gb, 13);
+    } else {
+        pic_conf.pic_height = ivi5_common_pic_sizes[pic_size_indx * 2 + 1] << 2;
+        pic_conf.pic_width  = ivi5_common_pic_sizes[pic_size_indx * 2    ] << 2;
+    }
+
+    if (ctx->gop_flags & 2) {
+        av_log(avctx, AV_LOG_ERROR, "YV12 picture format not supported!\n");
+        return -1;
+    }
+
+    pic_conf.chroma_height = (pic_conf.pic_height + 3) >> 2;
+    pic_conf.chroma_width  = (pic_conf.pic_width  + 3) >> 2;
+
+    if (!tile_size) {
+        pic_conf.tile_height = pic_conf.pic_height;
+        pic_conf.tile_width  = pic_conf.pic_width;
+    } else {
+        pic_conf.tile_height = pic_conf.tile_width = tile_size;
+    }
+
+    /* check if picture layout was changed and reallocate buffers */
+    if (ivi_pic_config_cmp(&pic_conf, &ctx->pic_conf)) {
+        result = ff_ivi_init_planes(ctx->planes, &pic_conf);
+        if (result) {
+            av_log(avctx, AV_LOG_ERROR, "Couldn't reallocate color planes!\n");
+            return -1;
+        }
+        ctx->pic_conf = pic_conf;
+        blk_size_changed = 1; /* force reallocation of the internal structures */
+    }
+
+    for (p = 0; p <= 1; p++) {
+        for (i = 0; i < (!p ? pic_conf.luma_bands : pic_conf.chroma_bands); i++) {
+            band = &ctx->planes[p].bands[i];
+
+            band->is_halfpel = get_bits1(&ctx->gb);
+
+            mb_size  = get_bits1(&ctx->gb);
+            blk_size = 8 >> get_bits1(&ctx->gb);
+            mb_size  = blk_size << !mb_size;
+
+            blk_size_changed = mb_size != band->mb_size || blk_size != band->blk_size;
+            if (blk_size_changed) {
+                band->mb_size  = mb_size;
+                band->blk_size = blk_size;
+            }
+
+            if (get_bits1(&ctx->gb)) {
+                av_log(avctx, AV_LOG_ERROR, "Extended transform info encountered!\n");
+                return -1;
+            }
+
+            /* select transform function and scan pattern according to plane and band number */
+            switch ((p << 2) + i) {
+            case 0:
+                band->inv_transform = ff_ivi_inverse_slant_8x8;
+                band->dc_transform  = ff_ivi_dc_slant_2d;
+                band->scan          = ivi5_scans8x8[0];
+                break;
+
+            case 1:
+                band->inv_transform = ff_ivi_row_slant8;
+                band->dc_transform  = ff_ivi_dc_row_slant;
+                band->scan          = ivi5_scans8x8[1];
+                break;
+
+            case 2:
+                band->inv_transform = ff_ivi_col_slant8;
+                band->dc_transform  = ff_ivi_dc_col_slant;
+                band->scan          = ivi5_scans8x8[2];
+                break;
+
+            case 3:
+                band->inv_transform = ff_ivi_put_pixels_8x8;
+                band->dc_transform  = ff_ivi_put_dc_pixel_8x8;
+                band->scan          = ivi5_scans8x8[2];
+                break;
+
+            case 4:
+                band->inv_transform = ff_ivi_inverse_slant_4x4;
+                band->dc_transform  = ff_ivi_dc_slant_2d;
+                band->scan          = ivi5_scan4x4;
+                break;
+            }
+
+            band->is_2d_trans = band->inv_transform == ff_ivi_inverse_slant_8x8 ||
+                                band->inv_transform == ff_ivi_inverse_slant_4x4;
+
+            /* select dequant matrix according to plane and band number */
+            if (!p) {
+                band->quant_mat = (pic_conf.luma_bands > 1) ? i+1 : 0;
+            } else {
+                band->quant_mat = 5;
+            }
+
+            if (get_bits(&ctx->gb, 2)) {
+                av_log(avctx, AV_LOG_ERROR, "End marker missing!\n");
+                return -1;
+            }
+        }
+    }
+
+    /* copy chroma parameters into the 2nd chroma plane */
+    for (i = 0; i < pic_conf.chroma_bands; i++) {
+        band1 = &ctx->planes[1].bands[i];
+        band2 = &ctx->planes[2].bands[i];
+
+        band2->width         = band1->width;
+        band2->height        = band1->height;
+        band2->mb_size       = band1->mb_size;
+        band2->blk_size      = band1->blk_size;
+        band2->is_halfpel    = band1->is_halfpel;
+        band2->quant_mat     = band1->quant_mat;
+        band2->scan          = band1->scan;
+        band2->inv_transform = band1->inv_transform;
+        band2->dc_transform  = band1->dc_transform;
+        band2->is_2d_trans   = band1->is_2d_trans;
+    }
+
+    /* reallocate internal structures if needed */
+    if (blk_size_changed) {
+        result = ff_ivi_init_tiles(ctx->planes, pic_conf.tile_width,
+                                   pic_conf.tile_height);
+        if (result) {
+            av_log(avctx, AV_LOG_ERROR,
+                   "Couldn't reallocate internal structures!\n");
+            return -1;
+        }
+    }
+
+    if (ctx->gop_flags & 8) {
+        if (get_bits(&ctx->gb, 3)) {
+            av_log(avctx, AV_LOG_ERROR, "Alignment bits are not zero!\n");
+            return -1;
+        }
+
+        if (get_bits1(&ctx->gb))
+            skip_bits_long(&ctx->gb, 24); /* skip transparency fill color */
+    }
+
+    align_get_bits(&ctx->gb);
+
+    skip_bits(&ctx->gb, 23); /* FIXME: unknown meaning */
+
+    /* skip GOP extension if any */
+    if (get_bits1(&ctx->gb)) {
+        do {
+            i = get_bits(&ctx->gb, 16);
+        } while (i & 0x8000);
+    }
+
+    align_get_bits(&ctx->gb);
+
+    return 0;
+}
+
+
+/**
+ *  Skips a header extension.
+ *
+ *  @param gb   [in,out] the GetBit context
+ */
+static inline void skip_hdr_extension(GetBitContext *gb)
+{
+    int i, len;
+
+    do {
+        len = get_bits(gb, 8);
+        for (i = 0; i < len; i++) skip_bits(gb, 8);
+    } while(len);
+}
+
+
+/**
+ *  Decodes Indeo5 picture header.
+ *
+ *  @param ctx      [in,out] ptr to the decoder context
+ *  @param avctx    [in] ptr to the AVCodecContext
+ *  @return         result code: 0 = OK, -1 = error
+ */
+static int decode_pic_hdr(IVI5DecContext *ctx, AVCodecContext *avctx)
+{
+    int         result;
+    IVIHuffDesc new_huff;
+
+    if (get_bits(&ctx->gb, 5) != 0x1F) {
+        av_log(avctx, AV_LOG_ERROR, "Invalid picture start code!\n");
+        return -1;
+    }
+
+    ctx->prev_frame_type = ctx->frame_type;
+    ctx->frame_type      = get_bits(&ctx->gb, 3);
+    if (ctx->frame_type >= 5) {
+        av_log(avctx, AV_LOG_ERROR, "Invalid frame type: %d \n", ctx->frame_type);
+        return -1;
+    }
+
+    ctx->frame_num = get_bits(&ctx->gb, 8);
+
+    if (ctx->frame_type == FRAMETYPE_INTRA) {
+        if (decode_gop_header(ctx, avctx))
+            return -1;
+    }
+
+    if (ctx->frame_type != FRAMETYPE_NULL) {
+        ctx->frame_flags = get_bits(&ctx->gb, 8);
+
+        ctx->pic_hdr_size = (ctx->frame_flags & 1) ? get_bits_long(&ctx->gb, 24) : 0;
+
+        ctx->checksum = (ctx->frame_flags & 0x10) ? get_bits(&ctx->gb, 16) : 0;
+
+        /* skip unknown extension if any */
+        if (ctx->frame_flags & 0x20)
+            skip_hdr_extension(&ctx->gb); /* XXX: untested */
+
+        /* decode macroblock huffman codebook */
+        if (ctx->frame_flags & 0x40) {
+            ctx->mb_huff_sel = ff_ivi_dec_huff_desc(&ctx->gb, &new_huff);
+            if (ctx->mb_huff_sel != 7) {
+                ctx->mb_vlc = &mb_vlc_tabs[ctx->mb_huff_sel];
+            } else {
+                if (ff_ivi_huff_desc_cmp(&new_huff, &ctx->mb_huff_desc)) {
+                    ff_ivi_huff_desc_copy(&ctx->mb_huff_desc, &new_huff);
+
+                    if (ctx->mb_vlc_cust.table)
+                        free_vlc(&ctx->mb_vlc_cust);
+                    result = ff_ivi_create_huff_from_desc(&ctx->mb_huff_desc,
+                                                          &ctx->mb_vlc_cust, 0);
+                    if (result) {
+                        av_log(avctx, AV_LOG_ERROR, "Error while initializing custom macroblock vlc table!\n");
+                        return -1;
+                    }
+                }
+                ctx->mb_vlc = &ctx->mb_vlc_cust;
+            }
+        } else {
+            ctx->mb_vlc = &mb_vlc_tabs[7]; /* select the default macroblock huffman table */
+        }
+
+        skip_bits(&ctx->gb, 3); /* FIXME: unknown meaning! */
+    }
+
+    align_get_bits(&ctx->gb);
+
+    return 0;
+}
+
+
+/**
+ *  Decodes Indeo5 band header.
+ *
+ *  @param ctx      [in,out] ptr to the decoder context
+ *  @param band     [in,out] ptr to the band descriptor
+ *  @param avctx    [in] ptr to the AVCodecContext
+ *  @return         result code: 0 = OK, -1 = error
+ */
+static int decode_band_hdr(IVI5DecContext *ctx, IVIBandDesc *band,
+                           AVCodecContext *avctx)
+{
+    int         i, result;
+    uint8_t     band_flags;
+    IVIHuffDesc new_huff;
+
+    band_flags = get_bits(&ctx->gb, 8);
+
+    if (band_flags & 1) {
+        band->is_empty = 1;
+        return 0;
+    }
+
+    band->data_size = (ctx->frame_flags & 0x80) ? get_bits_long(&ctx->gb, 24) : 0;
+
+    band->inherit_mv     = band_flags & 2;
+    band->inherit_qdelta = band_flags & 8;
+    band->qdelta_present = band_flags & 4;
+    if (!band->qdelta_present) band->inherit_qdelta = 1;
+
+    /* decode rvmap probability corrections if any */
+    band->num_corr = 0; /* there are no corrections */
+    if (band_flags & 0x10) {
+        band->num_corr = get_bits(&ctx->gb, 8); /* get number of correction pairs */
+        if (band->num_corr > 61) {
+            av_log(avctx, AV_LOG_ERROR, "Too many corrections: %d\n",
+                   band->num_corr);
+            return -1;
+        }
+
+        /* read correction pairs */
+        for (i = 0; i < band->num_corr * 2; i++)
+            band->corr[i] = get_bits(&ctx->gb, 8);
+    }
+
+    /* select appropriate rvmap table for this band */
+    band->rvmap_sel = (band_flags & 0x40) ? get_bits(&ctx->gb, 3) : 8;
+
+    /* decode block huffman codebook */
+    if (band_flags & 0x80) {
+        band->huff_sel = ff_ivi_dec_huff_desc(&ctx->gb, &new_huff);
+        if (band->huff_sel != 7) {
+            band->blk_vlc = &blk_vlc_tabs[band->huff_sel];
+        } else {
+            if (ff_ivi_huff_desc_cmp(&new_huff, &band->huff_desc)) {
+                ff_ivi_huff_desc_copy(&band->huff_desc, &new_huff);
+
+                if (band->blk_vlc_cust.table)
+                    free_vlc(&band->blk_vlc_cust);
+                result = ff_ivi_create_huff_from_desc(&band->huff_desc,
+                                                      &band->blk_vlc_cust, 0);
+                if (result) {
+                    av_log(avctx, AV_LOG_ERROR, "Error while initializing custom block vlc table!\n");
+                    return -1;
+                }
+            }
+            band->blk_vlc = &band->blk_vlc_cust;
+        }
+    } else {
+        band->blk_vlc = &blk_vlc_tabs[7]; /* select the default macroblock huffman table */
+    }
+
+    band->checksum_present = get_bits1(&ctx->gb);
+    if (band->checksum_present)
+        band->checksum = get_bits(&ctx->gb, 16);
+
+    band->glob_quant = get_bits(&ctx->gb, 5);
+
+    /* skip unknown extension if any */
+    if (band_flags & 0x20) { /* XXX: untested */
+        align_get_bits(&ctx->gb);
+        skip_hdr_extension(&ctx->gb);
+    }
+
+    align_get_bits(&ctx->gb);
+
+    return 0;
+}
+
+
+/**
+ *  Decodes info (block type, cbp, quant delta, motion vector)
+ *  for all macroblocks in the current tile.
+ *
+ *  @param ctx      [in,out] ptr to the decoder context
+ *  @param band     [in,out] ptr to the band descriptor
+ *  @param tile     [in,out] ptr to the tile descriptor
+ *  @param avctx    [in] ptr to the AVCodecContext
+ *  @return         result code: 0 = OK, -1 = error
+ */
+static int decode_mb_info(IVI5DecContext *ctx, IVIBandDesc *band,
+                          IVITile *tile, AVCodecContext *avctx)
+{
+    int         x, y, mv_x, mv_y, mv_delta, offs, mb_offset,
+                mv_scale, blks_per_mb;
+    IVIMbInfo   *mb, *ref_mb;
+    int         row_offset = band->mb_size * band->pitch;
+
+    mb     = tile->mbs;
+    ref_mb = tile->ref_mbs;
+    offs   = tile->ypos * band->pitch + tile->xpos;
+
+    /* scale factor for motion vectors */
+    mv_scale = (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3);
+    mv_x = mv_y = 0;
+
+    for (y = tile->ypos; y < (tile->ypos + tile->height); y += band->mb_size) {
+        mb_offset = offs;
+
+        for (x = tile->xpos; x < (tile->xpos + tile->width); x += band->mb_size) {
+            mb->xpos     = x;
+            mb->ypos     = y;
+            mb->buf_offs = mb_offset;
+
+            if (get_bits1(&ctx->gb)) {
+                if (ctx->frame_type == FRAMETYPE_INTRA) {
+                    av_log(avctx, AV_LOG_ERROR, "Empty macroblock in an INTRA picture!\n");
+                    return -1;
+                }
+                mb->type = 1; /* empty macroblocks are always INTER */
+                mb->cbp  = 0; /* all blocks are empty */
+
+                mb->q_delta = 0;
+                if (!band->plane && !band->band_num && (ctx->frame_flags & 8)) {
+                    mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc->table,
+                                           IVI_VLC_BITS, 1);
+                    mb->q_delta = IVI_TOSIGNED(mb->q_delta);
+                }
+
+                mb->mv_x = mb->mv_y = 0; /* no motion vector coded */
+                if (band->inherit_mv){
+                    /* motion vector inheritance */
+                    if (mv_scale) {
+                        mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
+                        mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
+                    } else {
+                        mb->mv_x = ref_mb->mv_x;
+                        mb->mv_y = ref_mb->mv_y;
+                    }
+                }
+            } else {
+                if (band->inherit_mv) {
+                    mb->type = ref_mb->type; /* copy mb_type from corresponding reference mb */
+                } else if (ctx->frame_type == FRAMETYPE_INTRA) {
+                    mb->type = 0; /* mb_type is always INTRA for intra-frames */
+                } else {
+                    mb->type = get_bits1(&ctx->gb);
+                }
+
+                blks_per_mb = band->mb_size != band->blk_size ? 4 : 1;
+                mb->cbp = get_bits(&ctx->gb, blks_per_mb);
+
+                mb->q_delta = 0;
+                if (band->qdelta_present) {
+                    if (band->inherit_qdelta) {
+                        if (ref_mb) mb->q_delta = ref_mb->q_delta;
+                    } else if (mb->cbp || (!band->plane && !band->band_num &&
+                                           (ctx->frame_flags & 8))) {
+                        mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc->table,
+                                               IVI_VLC_BITS, 1);
+                        mb->q_delta = IVI_TOSIGNED(mb->q_delta);
+                    }
+                }
+
+                if (!mb->type) {
+                    mb->mv_x = mb->mv_y = 0; /* there is no motion vector in intra-macroblocks */
+                } else {
+                    if (band->inherit_mv){
+                        /* motion vector inheritance */
+                        if (mv_scale) {
+                            mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
+                            mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
+                        } else {
+                            mb->mv_x = ref_mb->mv_x;
+                            mb->mv_y = ref_mb->mv_y;
+                        }
+                    } else {
+                        /* decode motion vector deltas */
+                        mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc->table,
+                                            IVI_VLC_BITS, 1);
+                        mv_y += IVI_TOSIGNED(mv_delta);
+                        mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc->table,
+                                            IVI_VLC_BITS, 1);
+                        mv_x += IVI_TOSIGNED(mv_delta);
+                        mb->mv_x = mv_x;
+                        mb->mv_y = mv_y;
+                    }
+                }
+            }
+
+            mb++;
+            if (ref_mb)
+                ref_mb++;
+            mb_offset += band->mb_size;
+        }
+
+        offs += row_offset;
+    }
+
+    align_get_bits(&ctx->gb);
+
+    return 0;
+}
+
+
+/**
+ *  Decodes an Indeo5 band.
+ *
+ *  @param ctx      [in,out] ptr to the decoder context
+ *  @param band     [in,out] ptr to the band descriptor
+ *  @param avctx    [in] ptr to the AVCodecContext
+ *  @return         result code: 0 = OK, -1 = error
+ */
+static int decode_band(IVI5DecContext *ctx, int plane_num,
+                       IVIBandDesc *band, AVCodecContext *avctx)
+{
+    int         result, i, t, idx1, idx2;
+    IVITile     *tile;
+    uint16_t    chksum;
+
+    band->buf     = band->bufs[ctx->dst_buf];
+    band->ref_buf = band->bufs[ctx->ref_buf];
+    band->data_ptr = ctx->frame_data + (get_bits_count(&ctx->gb) >> 3);
+
+    result = decode_band_hdr(ctx, band, avctx);
+    if (result) {
+        av_log(avctx, AV_LOG_ERROR, "Error while decoding band header: %d\n",
+               result);
+        return -1;
+    }
+
+    if (band->is_empty) {
+        av_log(avctx, AV_LOG_ERROR, "Empty band encountered!\n");
+        return -1;
+    }
+
+    band->rv_map = &ctx->rvmap_tabs[band->rvmap_sel];
+
+    /* apply corrections to the selected rvmap table if present */
+    for (i = 0; i < band->num_corr; i++) {
+        idx1 = band->corr[i*2];
+        idx2 = band->corr[i*2+1];
+        FFSWAP(uint8_t, band->rv_map->runtab[idx1], band->rv_map->runtab[idx2]);
+        FFSWAP(int16_t, band->rv_map->valtab[idx1], band->rv_map->valtab[idx2]);
+    }
+
+    for (t = 0; t < band->num_tiles; t++) {
+        tile = &band->tiles[t];
+
+        tile->is_empty = get_bits1(&ctx->gb);
+        if (tile->is_empty) {
+            ff_ivi_process_empty_tile(avctx, band, tile,
+                                      (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3));
+            align_get_bits(&ctx->gb);
+        } else {
+            tile->data_size = ff_ivi_dec_tile_data_size(&ctx->gb);
+
+            result = decode_mb_info(ctx, band, tile, avctx);
+            if (result < 0)
+                break;
+
+            if (band->blk_size == 8) {
+                band->intra_base  = &ivi5_base_quant_8x8_intra[band->quant_mat][0];
+                band->inter_base  = &ivi5_base_quant_8x8_inter[band->quant_mat][0];
+                band->intra_scale = &ivi5_scale_quant_8x8_intra[band->quant_mat][0];
+                band->inter_scale = &ivi5_scale_quant_8x8_inter[band->quant_mat][0];
+            } else {
+                band->intra_base  = ivi5_base_quant_4x4_intra;
+                band->inter_base  = ivi5_base_quant_4x4_inter;
+                band->intra_scale = ivi5_scale_quant_4x4_intra;
+                band->inter_scale = ivi5_scale_quant_4x4_inter;
+            }
+
+            result = ff_ivi_decode_blocks(&ctx->gb, band, tile);
+            if (result < 0) {
+                av_log(avctx, AV_LOG_ERROR, "Corrupted blocks data encountered!\n");
+                break;
+            }
+        }
+    }
+
+    /* 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];
+        FFSWAP(uint8_t, band->rv_map->runtab[idx1], band->rv_map->runtab[idx2]);
+        FFSWAP(int16_t, band->rv_map->valtab[idx1], band->rv_map->valtab[idx2]);
+    }
+
+    if (IVI_DEBUG && band->checksum_present) {
+        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->plane, band->band_num, band->checksum, chksum);
+        }
+    }
+
+    return result;
+}
+
+
+/**
+ *  Switches buffers.
+ *
+ *  @param ctx      [in,out] ptr to the decoder context
+ *  @param avctx    [in] ptr to the AVCodecContext
+ */
+static void switch_buffers(IVI5DecContext *ctx, AVCodecContext *avctx)
+{
+    switch (ctx->frame_type) {
+    case FRAMETYPE_INTRA:
+        ctx->buf_switch = 0;
+        ctx->dst_buf    = 0;
+        ctx->ref_buf    = 0;
+        break;
+    case FRAMETYPE_INTER:
+        ctx->buf_switch &= 1;
+        /* swap buffers only if there were no droppable frames */
+        if (ctx->prev_frame_type != FRAMETYPE_INTER_NOREF &&
+            ctx->prev_frame_type != FRAMETYPE_INTER_SCAL)
+            ctx->buf_switch ^= 1;
+        ctx->dst_buf = ctx->buf_switch;
+        ctx->ref_buf = ctx->buf_switch ^ 1;
+        break;
+    case FRAMETYPE_INTER_SCAL:
+        if (ctx->prev_frame_type == FRAMETYPE_INTER_NOREF)
+            break;
+        if (ctx->prev_frame_type != FRAMETYPE_INTER_SCAL) {
+            ctx->buf_switch ^= 1;
+            ctx->dst_buf     = ctx->buf_switch;
+            ctx->ref_buf     = ctx->buf_switch ^ 1;
+        } else {
+            ctx->buf_switch ^= 2;
+            ctx->dst_buf = 2;
+            ctx->ref_buf = ctx->buf_switch & 1;
+            if (!(ctx->buf_switch & 2))
+                FFSWAP(int, ctx->dst_buf, ctx->ref_buf);
+        }
+        break;
+    case FRAMETYPE_INTER_NOREF:
+        if (ctx->prev_frame_type == FRAMETYPE_INTER_SCAL) {
+            ctx->buf_switch ^= 2;
+            ctx->dst_buf = 2;
+            ctx->ref_buf = ctx->buf_switch & 1;
+            if (!(ctx->buf_switch & 2))
+                FFSWAP(int, ctx->dst_buf, ctx->ref_buf);
+        } else {
+            ctx->buf_switch ^= 1;
+            ctx->dst_buf     =  ctx->buf_switch & 1;
+            ctx->ref_buf     = (ctx->buf_switch & 1) ^ 1;
+        }
+        break;
+    case FRAMETYPE_NULL:
+        return;
+    default:
+        av_log(avctx, AV_LOG_ERROR, "unsupported frame type: %d\n", ctx->frame_type);
+    }
+}
+
+
+/**
+ *  Initializes Indeo5 decoder.
+ */
+static av_cold int decode_init(AVCodecContext *avctx)
+{
+    IVI5DecContext  *ctx = avctx->priv_data;
+    int             i, result;
+
+    /* initialize static vlc tables for macroblock/block signals */
+    for (i = 0; i < 8; i++) {
+        ff_ivi_create_huff_from_desc(&ff_ivi_mb_huff_desc[i],  &mb_vlc_tabs[i],  1);
+        ff_ivi_create_huff_from_desc(&ff_ivi_blk_huff_desc[i], &blk_vlc_tabs[i], 1);
+    }
+
+    /* copy rvmap tables in our context so we can apply changes to them */
+    memcpy(ctx->rvmap_tabs, ff_ivi_rvmap_tabs, sizeof(ff_ivi_rvmap_tabs));
+
+    /* set the initial picture layout according to the basic profile:
+       there is only one band per plane (no scalability), only one tile (no local decoding)
+       and picture format = YVU9 */
+    ctx->pic_conf.pic_width     = avctx->width;
+    ctx->pic_conf.pic_height    = avctx->height;
+    ctx->pic_conf.chroma_width  = (avctx->width  + 3) >> 2;
+    ctx->pic_conf.chroma_height = (avctx->height + 3) >> 2;
+    ctx->pic_conf.tile_width    = avctx->width;
+    ctx->pic_conf.tile_height   = avctx->height;
+    ctx->pic_conf.luma_bands    = ctx->pic_conf.chroma_bands = 1;
+
+    result = ff_ivi_init_planes(ctx->planes, &ctx->pic_conf);
+    if (result) {
+        av_log(avctx, AV_LOG_ERROR, "Couldn't allocate color planes!\n");
+        return -1;
+    }
+
+    avctx->pix_fmt = PIX_FMT_YUV410P;
+
+    return 0;
+}
+
+
+/**
+ *  main decoder function
+ */
+static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
+                        AVPacket *avpkt)
+{
+    IVI5DecContext  *ctx = avctx->priv_data;
+    const uint8_t   *buf = avpkt->data;
+    int             buf_size = avpkt->size;
+    int             result, p, b;
+
+    init_get_bits(&ctx->gb, buf, buf_size * 8);
+    ctx->frame_data = buf;
+    ctx->frame_size = buf_size;
+
+    result = decode_pic_hdr(ctx, avctx);
+    if (result) {
+        av_log(avctx, AV_LOG_ERROR,
+               "Error while decoding picture header: %d\n", result);
+        return -1;
+    }
+
+    if (ctx->gop_flags & IVI5_IS_PROTECTED) {
+        av_log(avctx, AV_LOG_ERROR, "Password-protected clip!\n");
+        return -1;
+    }
+
+    switch_buffers(ctx, avctx);
+
+    //START_TIMER;
+
+    if (ctx->frame_type == FRAMETYPE_NULL) {
+        ctx->frame_type = ctx->prev_frame_type;
+    } else {
+        for (p = 0; p < 3; p++) {
+            for (b = 0; b < ctx->planes[p].num_bands; b++) {
+                result = decode_band(ctx, p, &ctx->planes[p].bands[b], avctx);
+                if (result) {
+                    av_log(avctx, AV_LOG_ERROR,
+                           "Error while decoding band: %d, plane: %d\n", b, p);
+                    return -1;
+                }
+            }
+        }
+    }
+
+    //STOP_TIMER("decode_planes");
+
+    if (ctx->frame.data[0])
+        avctx->release_buffer(avctx, &ctx->frame);
+
+    ctx->frame.reference = 0;
+    if (avctx->get_buffer(avctx, &ctx->frame) < 0) {
+        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+        return -1;
+    }
+
+    if (ctx->is_scalable) {
+        ff_ivi_recompose53 (&ctx->planes[0], ctx->frame.data[0], ctx->frame.linesize[0], 4);
+    } else {
+        ff_ivi_output_plane(&ctx->planes[0], ctx->frame.data[0], ctx->frame.linesize[0]);
+    }
+
+    ff_ivi_output_plane(&ctx->planes[2], ctx->frame.data[1], ctx->frame.linesize[1]);
+    ff_ivi_output_plane(&ctx->planes[1], ctx->frame.data[2], ctx->frame.linesize[2]);
+
+    *data_size = sizeof(AVFrame);
+    *(AVFrame*)data = ctx->frame;
+
+    return buf_size;
+}
+
+
+/**
+ *  Closes Indeo5 decoder and cleans up its context.
+ */
+static av_cold int decode_close(AVCodecContext *avctx)
+{
+    IVI5DecContext *ctx = avctx->priv_data;
+
+    ff_ivi_free_buffers(&ctx->planes[0]);
+
+    if (ctx->frame.data[0])
+        avctx->release_buffer(avctx, &ctx->frame);
+
+    return 0;
+}
+
+
+AVCodec indeo5_decoder = {
+    .name           = "indeo5",
+    .type           = CODEC_TYPE_VIDEO,
+    .id             = CODEC_ID_INDEO5,
+    .priv_data_size = sizeof(IVI5DecContext),
+    .init           = decode_init,
+    .close          = decode_close,
+    .decode         = decode_frame,
+    .long_name      = NULL_IF_CONFIG_SMALL("Intel Indeo Video Interactive 5"),
+};