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4349 Serge 1 
/*
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 * Renderware TeXture Dictionary (.txd) image decoder
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 * Copyright (c) 2007 Ivo van Poorten
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 *
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 * See also: http://wiki.multimedia.cx/index.php?title=TXD
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; 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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 */
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#include "libavutil/intreadwrite.h"
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#include "libavutil/imgutils.h"
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#include "bytestream.h"
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#include "avcodec.h"
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#include "internal.h"
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#include "s3tc.h"
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static int txd_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
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                            AVPacket *avpkt) {
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    GetByteContext gb;
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    AVFrame * const p = data;
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    unsigned int version, w, h, d3d_format, depth, stride, flags;
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    unsigned int y, v;
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    uint8_t *ptr;
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    uint32_t *pal;
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    int ret;
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    bytestream2_init(&gb, avpkt->data, avpkt->size);
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    version         = bytestream2_get_le32(&gb);
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    bytestream2_skip(&gb, 72);
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    d3d_format      = bytestream2_get_le32(&gb);
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    w               = bytestream2_get_le16(&gb);
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    h               = bytestream2_get_le16(&gb);
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    depth           = bytestream2_get_byte(&gb);
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    bytestream2_skip(&gb, 2);
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    flags           = bytestream2_get_byte(&gb);
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    if (version < 8 || version > 9) {
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        av_log(avctx, AV_LOG_ERROR, "texture data version %i is unsupported\n",
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                                                                    version);
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        return AVERROR_PATCHWELCOME;
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    }
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    if (depth == 8) {
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        avctx->pix_fmt = AV_PIX_FMT_PAL8;
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    } else if (depth == 16 || depth == 32) {
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        avctx->pix_fmt = AV_PIX_FMT_RGB32;
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    } else {
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        av_log(avctx, AV_LOG_ERROR, "depth of %i is unsupported\n", depth);
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        return AVERROR_PATCHWELCOME;
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    }
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    if ((ret = av_image_check_size(w, h, 0, avctx)) < 0)
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        return ret;
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    if (w != avctx->width || h != avctx->height)
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        avcodec_set_dimensions(avctx, w, h);
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    if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
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        return ret;
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    p->pict_type = AV_PICTURE_TYPE_I;
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    ptr    = p->data[0];
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    stride = p->linesize[0];
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    if (depth == 8) {
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        pal = (uint32_t *) p->data[1];
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        for (y = 0; y < 256; y++) {
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            v = bytestream2_get_be32(&gb);
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            pal[y] = (v >> 8) + (v << 24);
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        }
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        if (bytestream2_get_bytes_left(&gb) < w * h)
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            return AVERROR_INVALIDDATA;
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        bytestream2_skip(&gb, 4);
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        for (y=0; y
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            bytestream2_get_buffer(&gb, ptr, w);
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            ptr += stride;
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        }
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    } else if (depth == 16) {
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        bytestream2_skip(&gb, 4);
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        switch (d3d_format) {
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        case 0:
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            if (!(flags & 1))
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                goto unsupported;
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        case FF_S3TC_DXT1:
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            if (bytestream2_get_bytes_left(&gb) < (w/4) * (h/4) * 8)
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                return AVERROR_INVALIDDATA;
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            ff_decode_dxt1(&gb, ptr, w, h, stride);
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            break;
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        case FF_S3TC_DXT3:
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            if (bytestream2_get_bytes_left(&gb) < (w/4) * (h/4) * 16)
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                return AVERROR_INVALIDDATA;
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            ff_decode_dxt3(&gb, ptr, w, h, stride);
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            break;
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        default:
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            goto unsupported;
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        }
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    } else if (depth == 32) {
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        switch (d3d_format) {
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        case 0x15:
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        case 0x16:
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            if (bytestream2_get_bytes_left(&gb) < h * w * 4)
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                return AVERROR_INVALIDDATA;
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            for (y=0; y
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                bytestream2_get_buffer(&gb, ptr, w * 4);
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                ptr += stride;
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            }
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            break;
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        default:
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            goto unsupported;
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        }
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    }
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    *got_frame = 1;
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128 
    return avpkt->size;
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unsupported:
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    av_log(avctx, AV_LOG_ERROR, "unsupported d3d format (%08x)\n", d3d_format);
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    return AVERROR_PATCHWELCOME;
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}
134 
 
135 
AVCodec ff_txd_decoder = {
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    .name           = "txd",
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    .long_name      = NULL_IF_CONFIG_SMALL("Renderware TXD (TeXture Dictionary) image"),
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    .type           = AVMEDIA_TYPE_VIDEO,
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    .id             = AV_CODEC_ID_TXD,
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    .decode         = txd_decode_frame,
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    .capabilities   = CODEC_CAP_DR1,
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};