indeo5.c 22.6 KB
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/*
 * Indeo Video Interactive v5 compatible decoder
 * Copyright (c) 2009 Maxim Poliakovski
 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * 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.
 *
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 * Libav is distributed in the hope that it will be useful,
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 * 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
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
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 * @file
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 * Indeo Video Interactive version 5 decoder
 *
 * Indeo5 data is usually transported within .avi or .mov files.
 * Known FOURCCs: 'IV50'
 */

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#define BITSTREAM_READER_LE
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#include "avcodec.h"
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#include "bitstream.h"
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#include "ivi.h"
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#include "ivi_dsp.h"
#include "indeo5data.h"
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#include "vlc.h"
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/**
 *  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

/**
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 *  Decode Indeo5 GOP (Group of pictures) header.
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 *  This header is present in key frames only.
 *  It defines parameters for all frames in a GOP.
 *
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 *  @param[in,out] ctx    ptr to the decoder context
 *  @param[in]     avctx  ptr to the AVCodecContext
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 *  @return         result code: 0 = OK, -1 = error
 */
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static int decode_gop_header(IVI45DecContext *ctx, AVCodecContext *avctx)
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{
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    int             result, i, p, tile_size, pic_size_indx, mb_size, blk_size;
    int             quant_mat, blk_size_changed = 0;
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    IVIBandDesc     *band, *band1, *band2;
    IVIPicConfig    pic_conf;

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    ctx->gop_flags = bitstream_read(&ctx->bc, 8);
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    ctx->gop_hdr_size = (ctx->gop_flags & 1) ? bitstream_read(&ctx->bc, 16) : 0;
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    if (ctx->gop_flags & IVI5_IS_PROTECTED)
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        ctx->lock_word = bitstream_read(&ctx->bc, 32);
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    tile_size = (ctx->gop_flags & 0x40) ? 64 << bitstream_read(&ctx->bc, 2) : 0;
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    if (tile_size > 256) {
        av_log(avctx, AV_LOG_ERROR, "Invalid tile size: %d\n", tile_size);
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        return AVERROR_INVALIDDATA;
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    }

    /* decode number of wavelet bands */
    /* num_levels * 3 + 1 */
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    pic_conf.luma_bands   = bitstream_read(&ctx->bc, 2)  * 3 + 1;
    pic_conf.chroma_bands = bitstream_read_bit(&ctx->bc) * 3 + 1;
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    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);
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        return AVERROR_INVALIDDATA;
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    }

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    pic_size_indx = bitstream_read(&ctx->bc, 4);
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    if (pic_size_indx == IVI5_PIC_SIZE_ESC) {
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        pic_conf.pic_height = bitstream_read(&ctx->bc, 13);
        pic_conf.pic_width  = bitstream_read(&ctx->bc, 13);
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    } 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) {
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        avpriv_report_missing_feature(avctx, "YV12 picture format");
        return AVERROR_PATCHWELCOME;
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    }

    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 */
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    if (ivi_pic_config_cmp(&pic_conf, &ctx->pic_conf) || ctx->gop_invalid) {
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        result = ff_ivi_init_planes(ctx->planes, &pic_conf, 0);
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        if (result < 0) {
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            av_log(avctx, AV_LOG_ERROR, "Couldn't reallocate color planes!\n");
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            return result;
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        }
        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];

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            band->is_halfpel = bitstream_read_bit(&ctx->bc);
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            mb_size  = bitstream_read_bit(&ctx->bc);
            blk_size = 8 >> bitstream_read_bit(&ctx->bc);
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            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;
            }

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            if (bitstream_read_bit(&ctx->bc)) {
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                avpriv_report_missing_feature(avctx, "Extended transform info");
                return AVERROR_PATCHWELCOME;
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            }

            /* select transform function and scan pattern according to plane and band number */
            switch ((p << 2) + i) {
            case 0:
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                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;
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                break;

            case 1:
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                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;
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                break;

            case 2:
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                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;
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                break;

            case 3:
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                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;
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                break;

            case 4:
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                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;
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                break;
            }

            band->is_2d_trans = band->inv_transform == ff_ivi_inverse_slant_8x8 ||
                                band->inv_transform == ff_ivi_inverse_slant_4x4;

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            if (band->transform_size != band->blk_size)
                return AVERROR_INVALIDDATA;

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            /* select dequant matrix according to plane and band number */
            if (!p) {
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                quant_mat = (pic_conf.luma_bands > 1) ? i+1 : 0;
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            } else {
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                quant_mat = 5;
            }

            if (band->blk_size == 8) {
                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;
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            }

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            if (bitstream_read(&ctx->bc, 2)) {
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                av_log(avctx, AV_LOG_ERROR, "End marker missing!\n");
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                return AVERROR_INVALIDDATA;
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            }
        }
    }

    /* 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;
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        band2->intra_base    = band1->intra_base;
        band2->inter_base    = band1->inter_base;
        band2->intra_scale   = band1->intra_scale;
        band2->inter_scale   = band1->inter_scale;
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        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);
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        if (result < 0) {
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            av_log(avctx, AV_LOG_ERROR,
                   "Couldn't reallocate internal structures!\n");
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            return result;
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        }
    }

    if (ctx->gop_flags & 8) {
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        if (bitstream_read(&ctx->bc, 3)) {
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            av_log(avctx, AV_LOG_ERROR, "Alignment bits are not zero!\n");
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            return AVERROR_INVALIDDATA;
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        }

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        if (bitstream_read_bit(&ctx->bc))
            bitstream_skip(&ctx->bc, 24); /* skip transparency fill color */
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    }

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    bitstream_align(&ctx->bc);
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    bitstream_skip(&ctx->bc, 23); /* FIXME: unknown meaning */
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    /* skip GOP extension if any */
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    if (bitstream_read_bit(&ctx->bc)) {
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        do {
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            i = bitstream_read(&ctx->bc, 16);
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        } while (i & 0x8000);
    }

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    bitstream_align(&ctx->bc);
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    return 0;
}


/**
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 *  Skip a header extension.
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 *
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 *  @param[in,out]  bc  the Bitstream context
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 */
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static inline void skip_hdr_extension(BitstreamContext *bc)
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{
    int i, len;

    do {
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        len = bitstream_read(bc, 8);
        for (i = 0; i < len; i++)
            bitstream_skip(bc, 8);
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    } while(len);
}


/**
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 *  Decode Indeo5 picture header.
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 *
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 *  @param[in,out]  ctx    ptr to the decoder context
 *  @param[in]      avctx  ptr to the AVCodecContext
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 *  @return         result code: 0 = OK, -1 = error
 */
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static int decode_pic_hdr(IVI45DecContext *ctx, AVCodecContext *avctx)
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{
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    int ret;

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    if (bitstream_read(&ctx->bc, 5) != 0x1F) {
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        av_log(avctx, AV_LOG_ERROR, "Invalid picture start code!\n");
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        return AVERROR_INVALIDDATA;
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    }

    ctx->prev_frame_type = ctx->frame_type;
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    ctx->frame_type      = bitstream_read(&ctx->bc, 3);
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    if (ctx->frame_type >= 5) {
        av_log(avctx, AV_LOG_ERROR, "Invalid frame type: %d \n", ctx->frame_type);
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        return AVERROR_INVALIDDATA;
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    }

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    ctx->frame_num = bitstream_read(&ctx->bc, 8);
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    if (ctx->frame_type == FRAMETYPE_INTRA) {
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        if ((ret = decode_gop_header(ctx, avctx)) < 0) {
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            av_log(avctx, AV_LOG_ERROR, "Invalid GOP header, skipping frames.\n");
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            ctx->gop_invalid = 1;
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            return ret;
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        }
        ctx->gop_invalid = 0;
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    }

    if (ctx->frame_type != FRAMETYPE_NULL) {
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        ctx->frame_flags = bitstream_read(&ctx->bc, 8);
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        ctx->pic_hdr_size = (ctx->frame_flags & 1) ? bitstream_read(&ctx->bc, 24) : 0;
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        ctx->checksum = (ctx->frame_flags & 0x10) ? bitstream_read(&ctx->bc, 16) : 0;
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        /* skip unknown extension if any */
        if (ctx->frame_flags & 0x20)
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            skip_hdr_extension(&ctx->bc); /* XXX: untested */
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        /* decode macroblock huffman codebook */
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        ret = ff_ivi_dec_huff_desc(&ctx->bc, ctx->frame_flags & 0x40,
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                                   IVI_MB_HUFF, &ctx->mb_vlc, avctx);
        if (ret < 0)
            return ret;
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        bitstream_skip(&ctx->bc, 3); /* FIXME: unknown meaning! */
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    }

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    bitstream_align(&ctx->bc);
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    return 0;
}


/**
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 *  Decode Indeo5 band header.
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 *
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 *  @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
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 *  @return         result code: 0 = OK, -1 = error
 */
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static int decode_band_hdr(IVI45DecContext *ctx, IVIBandDesc *band,
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                           AVCodecContext *avctx)
{
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    int         i, ret;
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    uint8_t     band_flags;

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    band_flags = bitstream_read(&ctx->bc, 8);
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    if (band_flags & 1) {
        band->is_empty = 1;
        return 0;
    }

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    band->data_size = (ctx->frame_flags & 0x80) ? bitstream_read(&ctx->bc, 24) : 0;
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    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) {
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        band->num_corr = bitstream_read(&ctx->bc, 8); /* get number of correction pairs */
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        if (band->num_corr > 61) {
            av_log(avctx, AV_LOG_ERROR, "Too many corrections: %d\n",
                   band->num_corr);
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            return AVERROR_INVALIDDATA;
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        }

        /* read correction pairs */
        for (i = 0; i < band->num_corr * 2; i++)
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            band->corr[i] = bitstream_read(&ctx->bc, 8);
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    }

    /* select appropriate rvmap table for this band */
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    band->rvmap_sel = (band_flags & 0x40) ? bitstream_read(&ctx->bc, 3) : 8;
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    /* decode block huffman codebook */
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    ret = ff_ivi_dec_huff_desc(&ctx->bc, band_flags & 0x80, IVI_BLK_HUFF,
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                               &band->blk_vlc, avctx);
    if (ret < 0)
        return ret;
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    band->checksum_present = bitstream_read_bit(&ctx->bc);
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    if (band->checksum_present)
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        band->checksum = bitstream_read(&ctx->bc, 16);
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    band->glob_quant = bitstream_read(&ctx->bc, 5);
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    /* skip unknown extension if any */
    if (band_flags & 0x20) { /* XXX: untested */
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        bitstream_align(&ctx->bc);
        skip_hdr_extension(&ctx->bc);
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    }

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    bitstream_align(&ctx->bc);
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    return 0;
}


/**
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 *  Decode info (block type, cbp, quant delta, motion vector)
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 *  for all macroblocks in the current tile.
 *
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 *  @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
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 *  @return         result code: 0 = OK, -1 = error
 */
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static int decode_mb_info(IVI45DecContext *ctx, IVIBandDesc *band,
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                          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;

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    if (!ref_mb &&
        ((band->qdelta_present && band->inherit_qdelta) || band->inherit_mv))
        return AVERROR_INVALIDDATA;

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    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;
    }

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    /* 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;

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            if (bitstream_read_bit(&ctx->bc)) {
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                if (ctx->frame_type == FRAMETYPE_INTRA) {
                    av_log(avctx, AV_LOG_ERROR, "Empty macroblock in an INTRA picture!\n");
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                    return AVERROR_INVALIDDATA;
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                }
                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)) {
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                    mb->q_delta = bitstream_read_vlc(&ctx->bc,
                                                     ctx->mb_vlc.tab->table,
                                                     IVI_VLC_BITS, 1);
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                    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 {
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                    mb->type = bitstream_read_bit(&ctx->bc);
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                }

                blks_per_mb = band->mb_size != band->blk_size ? 4 : 1;
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                mb->cbp = bitstream_read(&ctx->bc, blks_per_mb);
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                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))) {
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                        mb->q_delta = bitstream_read_vlc(&ctx->bc,
                                                         ctx->mb_vlc.tab->table,
                                                         IVI_VLC_BITS, 1);
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                        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 */
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                        mv_delta = bitstream_read_vlc(&ctx->bc,
                                                      ctx->mb_vlc.tab->table,
                                                      IVI_VLC_BITS, 1);
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                        mv_y += IVI_TOSIGNED(mv_delta);
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                        mv_delta = bitstream_read_vlc(&ctx->bc,
                                                      ctx->mb_vlc.tab->table,
                                                      IVI_VLC_BITS, 1);
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                        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;
    }

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    bitstream_align(&ctx->bc);
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    return 0;
}


/**
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 *  Switch buffers.
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 *
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 *  @param[in,out] ctx  ptr to the decoder context
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 */
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static void switch_buffers(IVI45DecContext *ctx)
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{
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    switch (ctx->prev_frame_type) {
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    case FRAMETYPE_INTRA:
    case FRAMETYPE_INTER:
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        ctx->buf_switch ^= 1;
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        ctx->dst_buf = ctx->buf_switch;
        ctx->ref_buf = ctx->buf_switch ^ 1;
        break;
    case FRAMETYPE_INTER_SCAL:
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        if (!ctx->inter_scal) {
            ctx->ref2_buf   = 2;
            ctx->inter_scal = 1;
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        }
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        FFSWAP(int, ctx->dst_buf, ctx->ref2_buf);
        ctx->ref_buf = ctx->ref2_buf;
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        break;
    case FRAMETYPE_INTER_NOREF:
        break;
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    }

    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:
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    case FRAMETYPE_NULL:
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        break;
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    }
}


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static int is_nonnull_frame(IVI45DecContext *ctx)
{
    return ctx->frame_type != FRAMETYPE_NULL;
}


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/**
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 *  Initialize Indeo5 decoder.
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 */
static av_cold int decode_init(AVCodecContext *avctx)
{
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    IVI45DecContext  *ctx = avctx->priv_data;
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    int             result;
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    ff_ivi_init_static_vlc();
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    /* 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;

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    result = ff_ivi_init_planes(ctx->planes, &ctx->pic_conf, 0);
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    if (result) {
        av_log(avctx, AV_LOG_ERROR, "Couldn't allocate color planes!\n");
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        return AVERROR_INVALIDDATA;
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    }

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    ctx->buf_switch = 0;
    ctx->inter_scal = 0;

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    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;
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    ctx->is_indeo4 = 0;

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    avctx->pix_fmt = AV_PIX_FMT_YUV410P;
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    return 0;
}


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AVCodec ff_indeo5_decoder = {
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    .name           = "indeo5",
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    .long_name      = NULL_IF_CONFIG_SMALL("Intel Indeo Video Interactive 5"),
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    .type           = AVMEDIA_TYPE_VIDEO,
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    .id             = AV_CODEC_ID_INDEO5,
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    .priv_data_size = sizeof(IVI45DecContext),
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    .init           = decode_init,
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    .close          = ff_ivi_decode_close,
    .decode         = ff_ivi_decode_frame,
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    .capabilities   = AV_CODEC_CAP_DR1,
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};