/*

 * 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

 * Indeo Video Interactive version 5 decoder

 *

 * Indeo5 data is usually transported within .avi or .mov files.

 * Known FOURCCs: 'IV50'

 */

#define BITSTREAM_READER_LE

#include "avcodec.h"

#include "codec_internal.h"

#include "get_bits.h"

#include "ivi.h"

#include "ivi_dsp.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

/**

 *  Decode Indeo5 GOP (Group of pictures) header.

 *  This header is present in key frames only.

 *  It defines parameters for all frames in a GOP.

 *

 *  @param[in,out] ctx    ptr to the decoder context

 *  @param[in]     avctx  ptr to the AVCodecContext

 *  @return         result code: 0 = OK, -1 = error

 */

static int decode_gop_header(IVI45DecContext *ctx, AVCodecContext *avctx)

{

    int             result, i, p, tile_size, pic_size_indx, mb_size, blk_size, is_scalable;

    int             quant_mat, 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 AVERROR_INVALIDDATA;

    }

    /* 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;

    is_scalable = pic_conf.luma_bands != 1 || pic_conf.chroma_bands != 1;

    if (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 AVERROR_INVALIDDATA;

    }

    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) {

        avpriv_report_missing_feature(avctx, "YV12 picture format");

        return AVERROR_PATCHWELCOME;

    }

    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) || ctx->gop_invalid) {

        result = ff_ivi_init_planes(avctx, ctx->planes, &pic_conf, 0);

        if (result < 0) {

            av_log(avctx, AV_LOG_ERROR, "Couldn't reallocate color planes!\n");

            return result;

        }

        ctx->pic_conf = pic_conf;

        ctx->is_scalable = is_scalable;

        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;

            if (p==0 && blk_size==4) {

                av_log(avctx, AV_LOG_ERROR, "4x4 luma blocks are unsupported!\n");

                return AVERROR_PATCHWELCOME;

            }

            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)) {

                avpriv_report_missing_feature(avctx, "Extended transform info");

                return AVERROR_PATCHWELCOME;

            }

            /* 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           = ff_zigzag_direct;

                band->transform_size = 8;

                break;

            case 1:

                band->inv_transform  = ff_ivi_row_slant8;

                band->dc_transform   = ff_ivi_dc_row_slant;

                band->scan           = ff_ivi_vertical_scan_8x8;

                band->transform_size = 8;

                break;

            case 2:

                band->inv_transform  = ff_ivi_col_slant8;

                band->dc_transform   = ff_ivi_dc_col_slant;

                band->scan           = ff_ivi_horizontal_scan_8x8;

                band->transform_size = 8;

                break;

            case 3:

                band->inv_transform  = ff_ivi_put_pixels_8x8;

                band->dc_transform   = ff_ivi_put_dc_pixel_8x8;

                band->scan           = ff_ivi_horizontal_scan_8x8;

                band->transform_size = 8;

                break;

            case 4:

                band->inv_transform  = ff_ivi_inverse_slant_4x4;

                band->dc_transform   = ff_ivi_dc_slant_2d;

                band->scan           = ff_ivi_direct_scan_4x4;

                band->transform_size = 4;

                break;

            }

            band->is_2d_trans = band->inv_transform == ff_ivi_inverse_slant_8x8 ||

                                band->inv_transform == ff_ivi_inverse_slant_4x4;

            if (band->transform_size != band->blk_size) {

                av_log(avctx, AV_LOG_ERROR, "transform and block size mismatch (%d != %d)\n", band->transform_size, band->blk_size);

                return AVERROR_INVALIDDATA;

            }

            /* select dequant matrix according to plane and band number */

            if (!p) {

                quant_mat = (pic_conf.luma_bands > 1) ? i+1 : 0;

            } else {

                quant_mat = 5;

            }

            if (band->blk_size == 8) {

                if(quant_mat >= 5){

                    av_log(avctx, AV_LOG_ERROR, "quant_mat %d too large!\n", quant_mat);

                    return -1;

                }

                band->intra_base  = &ivi5_base_quant_8x8_intra[quant_mat][0];

                band->inter_base  = &ivi5_base_quant_8x8_inter[quant_mat][0];

                band->intra_scale = &ivi5_scale_quant_8x8_intra[quant_mat][0];

                band->inter_scale = &ivi5_scale_quant_8x8_inter[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;

            }

            if (get_bits(&ctx->gb, 2)) {

                av_log(avctx, AV_LOG_ERROR, "End marker missing!\n");

                return AVERROR_INVALIDDATA;

            }

        }

    }

    /* 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->intra_base    = band1->intra_base;

        band2->inter_base    = band1->inter_base;

        band2->intra_scale   = band1->intra_scale;

        band2->inter_scale   = band1->inter_scale;

        band2->scan          = band1->scan;

        band2->inv_transform = band1->inv_transform;

        band2->dc_transform  = band1->dc_transform;

        band2->is_2d_trans   = band1->is_2d_trans;

        band2->transform_size= band1->transform_size;

    }

    /* 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 < 0) {

            av_log(avctx, AV_LOG_ERROR,

                   "Couldn't reallocate internal structures!\n");

            return result;

        }

    }

    if (ctx->gop_flags & 8) {

        if (get_bits(&ctx->gb, 3)) {

            av_log(avctx, AV_LOG_ERROR, "Alignment bits are not zero!\n");

            return AVERROR_INVALIDDATA;

        }

        if (get_bits1(&ctx->gb))

            skip_bits(&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;

}

/**

 *  Skip a header extension.

 *

 *  @param[in,out]  gb  the GetBit context

 */

static inline int skip_hdr_extension(GetBitContext *gb)

{

    int i, len;

    do {

        len = get_bits(gb, 8);

        if (8*len > get_bits_left(gb))

            return AVERROR_INVALIDDATA;

        for (i = 0; i < len; i++) skip_bits(gb, 8);

    } while(len);

    return 0;

}

/**

 *  Decode Indeo5 picture header.

 *

 *  @param[in,out]  ctx    ptr to the decoder context

 *  @param[in]      avctx  ptr to the AVCodecContext

 *  @return         result code: 0 = OK, -1 = error

 */

static int decode_pic_hdr(IVI45DecContext *ctx, AVCodecContext *avctx)

{

    int ret;

    if (get_bits(&ctx->gb, 5) != 0x1F) {

        av_log(avctx, AV_LOG_ERROR, "Invalid picture start code!\n");

        return AVERROR_INVALIDDATA;

    }

    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);

        ctx->frame_type = FRAMETYPE_INTRA;

        return AVERROR_INVALIDDATA;

    }

    ctx->frame_num = get_bits(&ctx->gb, 8);

    if (ctx->frame_type == FRAMETYPE_INTRA) {

        if ((ret = decode_gop_header(ctx, avctx)) < 0) {

            av_log(avctx, AV_LOG_ERROR, "Invalid GOP header, skipping frames.\n");

            ctx->gop_invalid = 1;

            return ret;

        }

        ctx->gop_invalid = 0;

    }

    if (ctx->frame_type == FRAMETYPE_INTER_SCAL && !ctx->is_scalable) {

        av_log(avctx, AV_LOG_ERROR, "Scalable inter frame in non scalable stream\n");

        ctx->frame_type = FRAMETYPE_INTER;

        return AVERROR_INVALIDDATA;

    }

    if (ctx->frame_type != FRAMETYPE_NULL) {

        ctx->frame_flags = get_bits(&ctx->gb, 8);

        ctx->pic_hdr_size = (ctx->frame_flags & 1) ? get_bits(&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 */

        ret = ff_ivi_dec_huff_desc(&ctx->gb, ctx->frame_flags & 0x40,

                                   IVI_MB_HUFF, &ctx->mb_vlc, avctx);

        if (ret < 0)

            return ret;

        skip_bits(&ctx->gb, 3); /* FIXME: unknown meaning! */

    }

    align_get_bits(&ctx->gb);

    return 0;

}

/**

 *  Decode Indeo5 band header.

 *

 *  @param[in,out]  ctx    ptr to the decoder context

 *  @param[in,out]  band   ptr to the band descriptor

 *  @param[in]      avctx  ptr to the AVCodecContext

 *  @return         result code: 0 = OK, -1 = error

 */

static int decode_band_hdr(IVI45DecContext *ctx, IVIBandDesc *band,

                           AVCodecContext *avctx)

{

    int         i, ret;

    uint8_t     band_flags;

    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(&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 AVERROR_INVALIDDATA;

        }

        /* 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 */

    ret = ff_ivi_dec_huff_desc(&ctx->gb, band_flags & 0x80, IVI_BLK_HUFF,

                               &band->blk_vlc, avctx);

    if (ret < 0)

        return ret;

    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;

}

/**

 *  Decode info (block type, cbp, quant delta, motion vector)

 *  for all macroblocks in the current tile.

 *

 *  @param[in,out]  ctx    ptr to the decoder context

 *  @param[in,out]  band   ptr to the band descriptor

 *  @param[in,out]  tile   ptr to the tile descriptor

 *  @param[in]      avctx  ptr to the AVCodecContext

 *  @return         result code: 0 = OK, -1 = error

 */

static int decode_mb_info(IVI45DecContext *ctx, IVIBandDesc *band,

                          IVITile *tile, AVCodecContext *avctx)

{

    int         x, y, mv_x, mv_y, mv_delta, offs, mb_offset,

                mv_scale, blks_per_mb, s;

    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;

    if (!ref_mb &&

        ((band->qdelta_present && band->inherit_qdelta) || band->inherit_mv))

        return AVERROR_INVALIDDATA;

    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 parameters %d\n",

               tile->num_MBs, IVI_MBs_PER_TILE(tile->width, tile->height, band->mb_size));

        return AVERROR_INVALIDDATA;

    }

    /* 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 AVERROR_INVALIDDATA;

                }

                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.tab->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 && ref_mb){

                    /* 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 && ref_mb) {

                    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.tab->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 && ref_mb){

                        /* 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.tab->table,

                                            IVI_VLC_BITS, 1);

                        mv_y += IVI_TOSIGNED(mv_delta);

                        mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,

                                            IVI_VLC_BITS, 1);

                        mv_x += IVI_TOSIGNED(mv_delta);

                        mb->mv_x = mv_x;

                        mb->mv_y = mv_y;

                    }

                }

            }

            s= band->is_halfpel;

            if (mb->type)

            if ( x +  (mb->mv_x   >>s) +                 (y+               (mb->mv_y   >>s))*band->pitch < 0 ||

                 x + ((mb->mv_x+s)>>s) + band->mb_size - 1

                   + (y+band->mb_size - 1 +((mb->mv_y+s)>>s))*band->pitch > band->bufsize - 1) {

                av_log(avctx, AV_LOG_ERROR, "motion vector %d %d outside reference\n", x*s + mb->mv_x, y*s + mb->mv_y);

                return AVERROR_INVALIDDATA;

            }

            mb++;

            if (ref_mb)

                ref_mb++;

            mb_offset += band->mb_size;

        }

        offs += row_offset;

    }

    align_get_bits(&ctx->gb);

    return 0;

}

/**

 *  Switch buffers.

 *

 *  @param[in,out] ctx  ptr to the decoder context

 */

static void switch_buffers(IVI45DecContext *ctx)

{

    switch (ctx->prev_frame_type) {

    case FRAMETYPE_INTRA:

    case FRAMETYPE_INTER:

        ctx->buf_switch ^= 1;

        ctx->dst_buf = ctx->buf_switch;

        ctx->ref_buf = ctx->buf_switch ^ 1;

        break;

    case FRAMETYPE_INTER_SCAL:

        if (!ctx->inter_scal) {

            ctx->ref2_buf   = 2;

            ctx->inter_scal = 1;

        }

        FFSWAP(int, ctx->dst_buf, ctx->ref2_buf);

        ctx->ref_buf = ctx->ref2_buf;

        break;

    case FRAMETYPE_INTER_NOREF:

        break;

    }

    switch (ctx->frame_type) {

    case FRAMETYPE_INTRA:

        ctx->buf_switch = 0;

        /* FALLTHROUGH */

    case FRAMETYPE_INTER:

        ctx->inter_scal = 0;

        ctx->dst_buf = ctx->buf_switch;

        ctx->ref_buf = ctx->buf_switch ^ 1;

        break;

    case FRAMETYPE_INTER_SCAL:

    case FRAMETYPE_INTER_NOREF:

    case FRAMETYPE_NULL:

        break;

    }

}

static int is_nonnull_frame(IVI45DecContext *ctx)

{

    return ctx->frame_type != FRAMETYPE_NULL;

}

/**

 *  Initialize Indeo5 decoder.

 */

static av_cold int decode_init(AVCodecContext *avctx)

{

    IVI45DecContext  *ctx = avctx->priv_data;

    int             result;

    ctx->gop_invalid = 1;

    ff_ivi_init_static_vlc();

    /* 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(avctx, ctx->planes, &ctx->pic_conf, 0);

    if (result) {

        av_log(avctx, AV_LOG_ERROR, "Couldn't allocate color planes!\n");

        return AVERROR_INVALIDDATA;

    }

    ctx->buf_switch = 0;

    ctx->inter_scal = 0;

    ctx->decode_pic_hdr   = decode_pic_hdr;

    ctx->decode_band_hdr  = decode_band_hdr;

    ctx->decode_mb_info   = decode_mb_info;

    ctx->switch_buffers   = switch_buffers;

    ctx->is_nonnull_frame = is_nonnull_frame;

    ctx->is_indeo4 = 0;

    avctx->pix_fmt = AV_PIX_FMT_YUV410P;

    return 0;

}

const FFCodec ff_indeo5_decoder = {

    .p.name         = "indeo5",

    CODEC_LONG_NAME("Intel Indeo Video Interactive 5"),

    .p.type         = AVMEDIA_TYPE_VIDEO,

    .p.id           = AV_CODEC_ID_INDEO5,

    .priv_data_size = sizeof(IVI45DecContext),

    .init           = decode_init,

    .close          = ff_ivi_decode_close,

    FF_CODEC_DECODE_CB(ff_ivi_decode_frame),

    .p.capabilities = AV_CODEC_CAP_DR1,

    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,

};