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  1. /*
  2.  * Renderware TeXture Dictionary (.txd) image decoder
  3.  * Copyright (c) 2007 Ivo van Poorten
  4.  *
  5.  * See also: http://wiki.multimedia.cx/index.php?title=TXD
  6.  *
  7.  * This file is part of FFmpeg.
  8.  *
  9.  * FFmpeg is free software; you can redistribute it and/or
  10.  * modify it under the terms of the GNU Lesser General Public
  11.  * License as published by the Free Software Foundation; either
  12.  * version 2.1 of the License, or (at your option) any later version.
  13.  *
  14.  * FFmpeg is distributed in the hope that it will be useful,
  15.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17.  * Lesser General Public License for more details.
  18.  *
  19.  * You should have received a copy of the GNU Lesser General Public
  20.  * License along with FFmpeg; if not, write to the Free Software
  21.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22.  */
  23.  
  24. #include "libavutil/intreadwrite.h"
  25. #include "libavutil/imgutils.h"
  26. #include "bytestream.h"
  27. #include "avcodec.h"
  28. #include "internal.h"
  29. #include "s3tc.h"
  30.  
  31. static int txd_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
  32.                             AVPacket *avpkt) {
  33.     GetByteContext gb;
  34.     AVFrame * const p = data;
  35.     unsigned int version, w, h, d3d_format, depth, stride, flags;
  36.     unsigned int y, v;
  37.     uint8_t *ptr;
  38.     uint32_t *pal;
  39.     int ret;
  40.  
  41.     bytestream2_init(&gb, avpkt->data, avpkt->size);
  42.     version         = bytestream2_get_le32(&gb);
  43.     bytestream2_skip(&gb, 72);
  44.     d3d_format      = bytestream2_get_le32(&gb);
  45.     w               = bytestream2_get_le16(&gb);
  46.     h               = bytestream2_get_le16(&gb);
  47.     depth           = bytestream2_get_byte(&gb);
  48.     bytestream2_skip(&gb, 2);
  49.     flags           = bytestream2_get_byte(&gb);
  50.  
  51.     if (version < 8 || version > 9) {
  52.         av_log(avctx, AV_LOG_ERROR, "texture data version %i is unsupported\n",
  53.                                                                     version);
  54.         return AVERROR_PATCHWELCOME;
  55.     }
  56.  
  57.     if (depth == 8) {
  58.         avctx->pix_fmt = AV_PIX_FMT_PAL8;
  59.     } else if (depth == 16 || depth == 32) {
  60.         avctx->pix_fmt = AV_PIX_FMT_RGB32;
  61.     } else {
  62.         av_log(avctx, AV_LOG_ERROR, "depth of %i is unsupported\n", depth);
  63.         return AVERROR_PATCHWELCOME;
  64.     }
  65.  
  66.     if ((ret = av_image_check_size(w, h, 0, avctx)) < 0)
  67.         return ret;
  68.     if (w != avctx->width || h != avctx->height)
  69.         avcodec_set_dimensions(avctx, w, h);
  70.     if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
  71.         return ret;
  72.  
  73.     p->pict_type = AV_PICTURE_TYPE_I;
  74.  
  75.     ptr    = p->data[0];
  76.     stride = p->linesize[0];
  77.  
  78.     if (depth == 8) {
  79.         pal = (uint32_t *) p->data[1];
  80.         for (y = 0; y < 256; y++) {
  81.             v = bytestream2_get_be32(&gb);
  82.             pal[y] = (v >> 8) + (v << 24);
  83.         }
  84.         if (bytestream2_get_bytes_left(&gb) < w * h)
  85.             return AVERROR_INVALIDDATA;
  86.         bytestream2_skip(&gb, 4);
  87.         for (y=0; y<h; y++) {
  88.             bytestream2_get_buffer(&gb, ptr, w);
  89.             ptr += stride;
  90.         }
  91.     } else if (depth == 16) {
  92.         bytestream2_skip(&gb, 4);
  93.         switch (d3d_format) {
  94.         case 0:
  95.             if (!(flags & 1))
  96.                 goto unsupported;
  97.         case FF_S3TC_DXT1:
  98.             if (bytestream2_get_bytes_left(&gb) < (w/4) * (h/4) * 8)
  99.                 return AVERROR_INVALIDDATA;
  100.             ff_decode_dxt1(&gb, ptr, w, h, stride);
  101.             break;
  102.         case FF_S3TC_DXT3:
  103.             if (bytestream2_get_bytes_left(&gb) < (w/4) * (h/4) * 16)
  104.                 return AVERROR_INVALIDDATA;
  105.             ff_decode_dxt3(&gb, ptr, w, h, stride);
  106.             break;
  107.         default:
  108.             goto unsupported;
  109.         }
  110.     } else if (depth == 32) {
  111.         switch (d3d_format) {
  112.         case 0x15:
  113.         case 0x16:
  114.             if (bytestream2_get_bytes_left(&gb) < h * w * 4)
  115.                 return AVERROR_INVALIDDATA;
  116.             for (y=0; y<h; y++) {
  117.                 bytestream2_get_buffer(&gb, ptr, w * 4);
  118.                 ptr += stride;
  119.             }
  120.             break;
  121.         default:
  122.             goto unsupported;
  123.         }
  124.     }
  125.  
  126.     *got_frame = 1;
  127.  
  128.     return avpkt->size;
  129.  
  130. unsupported:
  131.     av_log(avctx, AV_LOG_ERROR, "unsupported d3d format (%08x)\n", d3d_format);
  132.     return AVERROR_PATCHWELCOME;
  133. }
  134.  
  135. AVCodec ff_txd_decoder = {
  136.     .name           = "txd",
  137.     .long_name      = NULL_IF_CONFIG_SMALL("Renderware TXD (TeXture Dictionary) image"),
  138.     .type           = AVMEDIA_TYPE_VIDEO,
  139.     .id             = AV_CODEC_ID_TXD,
  140.     .decode         = txd_decode_frame,
  141.     .capabilities   = CODEC_CAP_DR1,
  142. };
  143.