libavcodec/txd.c

   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 Libav.
   8  *
   9  * Libav 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  * Libav 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 Libav; 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 "avcodec.h"
  27 #include "bytestream.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         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
  72         return ret;
  73     }
  74
  75     p->pict_type = AV_PICTURE_TYPE_I;
  76
  77     ptr    = p->data[0];
  78     stride = p->linesize[0];
  79
  80     if (depth == 8) {
  81         pal = (uint32_t *) p->data[1];
  82         for (y = 0; y < 256; y++) {
  83             v = bytestream2_get_be32(&gb);
  84             pal[y] = (v >> 8) + (v << 24);
  85         }
  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             ff_decode_dxt1(&gb, ptr, w, h, stride);
  99             break;
 100         case FF_S3TC_DXT3:
 101             ff_decode_dxt3(&gb, ptr, w, h, stride);
 102             break;
 103         default:
 104             goto unsupported;
 105         }
 106     } else if (depth == 32) {
 107         switch (d3d_format) {
 108         case 0x15:
 109         case 0x16:
 110             for (y=0; y<h; y++) {
 111                 bytestream2_get_buffer(&gb, ptr, w * 4);
 112                 ptr += stride;
 113             }
 114             break;
 115         default:
 116             goto unsupported;
 117         }
 118     }
 119
 120     *got_frame = 1;
 121
 122     return avpkt->size;
 123
 124 unsupported:
 125     av_log(avctx, AV_LOG_ERROR, "unsupported d3d format (%08x)\n", d3d_format);
 126     return AVERROR_PATCHWELCOME;
 127 }
 128
 129 AVCodec ff_txd_decoder = {
 130     .name           = "txd",
 131     .type           = AVMEDIA_TYPE_VIDEO,
 132     .id             = AV_CODEC_ID_TXD,
 133     .decode         = txd_decode_frame,
 134     .capabilities   = CODEC_CAP_DR1,
 135     .long_name      = NULL_IF_CONFIG_SMALL("Renderware TXD (TeXture Dictionary) image"),
 136 };