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 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 "avcodec.h"
  25 #include "s3tc.h"
  26
  27 typedef struct TXDContext {
  28     AVFrame picture;
  29 } TXDContext;
  30
  31 static av_cold int txd_init(AVCodecContext *avctx) {
  32     TXDContext *s = avctx->priv_data;
  33
  34     avcodec_get_frame_defaults(&s->picture);
  35     avctx->coded_frame = &s->picture;
  36
  37     return 0;
  38 }
  39
  40 static int txd_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
  41                             const uint8_t *buf, int buf_size) {
  42     TXDContext * const s = avctx->priv_data;
  43     AVFrame *picture = data;
  44     AVFrame * const p = &s->picture;
  45     unsigned int version, w, h, d3d_format, depth, stride, mipmap_count, flags;
  46     unsigned int y, v;
  47     uint8_t *ptr;
  48     const uint8_t *cur = buf;
  49     const uint32_t *palette = (const uint32_t *)(cur + 88);
  50     uint32_t *pal;
  51
  52     version         = AV_RL32(cur);
  53     d3d_format      = AV_RL32(cur+76);
  54     w               = AV_RL16(cur+80);
  55     h               = AV_RL16(cur+82);
  56     depth           = AV_RL8 (cur+84);
  57     mipmap_count    = AV_RL8 (cur+85);
  58     flags           = AV_RL8 (cur+87);
  59     cur            += 92;
  60
  61     if (version < 8 || version > 9) {
  62         av_log(avctx, AV_LOG_ERROR, "texture data version %i is unsupported\n",
  63                                                                     version);
  64         return -1;
  65     }
  66
  67     if (depth == 8) {
  68         avctx->pix_fmt = PIX_FMT_PAL8;
  69         cur += 1024;
  70     } else if (depth == 16 || depth == 32)
  71         avctx->pix_fmt = PIX_FMT_RGB32;
  72     else {
  73         av_log(avctx, AV_LOG_ERROR, "depth of %i is unsupported\n", depth);
  74         return -1;
  75     }
  76
  77     if (p->data[0])
  78         avctx->release_buffer(avctx, p);
  79
  80     if (avcodec_check_dimensions(avctx, w, h))
  81         return -1;
  82     if (w != avctx->width || h != avctx->height)
  83         avcodec_set_dimensions(avctx, w, h);
  84     if (avctx->get_buffer(avctx, p) < 0) {
  85         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
  86         return -1;
  87     }
  88
  89     p->pict_type = FF_I_TYPE;
  90
  91     ptr    = p->data[0];
  92     stride = p->linesize[0];
  93
  94     if (depth == 8) {
  95         pal = (uint32_t *) p->data[1];
  96         for (y=0; y<256; y++) {
  97             v = AV_RB32(palette+y);
  98             pal[y] = (v>>8) + (v<<24);
  99         }
 100         for (y=0; y<h; y++) {
 101             memcpy(ptr, cur, w);
 102             ptr += stride;
 103             cur += w;
 104         }
 105     } else if (depth == 16) {
 106         switch (d3d_format) {
 107         case 0:
 108             if (!flags&1) goto unsupported;
 109         case FF_S3TC_DXT1:
 110             ff_decode_dxt1(cur, ptr, w, h, stride);
 111             break;
 112         case FF_S3TC_DXT3:
 113             ff_decode_dxt3(cur, ptr, w, h, stride);
 114             break;
 115         default:
 116             goto unsupported;
 117         }
 118     } else if (depth == 32) {
 119         switch (d3d_format) {
 120         case 0x15:
 121         case 0x16:
 122             for (y=0; y<h; y++) {
 123                 memcpy(ptr, cur, w*4);
 124                 ptr += stride;
 125                 cur += w*4;
 126             }
 127             break;
 128         default:
 129             goto unsupported;
 130         }
 131     }
 132
 133     for (; mipmap_count > 1; mipmap_count--)
 134         cur += AV_RL32(cur) + 4;
 135
 136     *picture   = s->picture;
 137     *data_size = sizeof(AVPicture);
 138
 139     return cur - buf;
 140
 141 unsupported:
 142     av_log(avctx, AV_LOG_ERROR, "unsupported d3d format (%08x)\n", d3d_format);
 143     return -1;
 144 }
 145
 146 static av_cold int txd_end(AVCodecContext *avctx) {
 147     TXDContext *s = avctx->priv_data;
 148
 149     if (s->picture.data[0])
 150         avctx->release_buffer(avctx, &s->picture);
 151
 152     return 0;
 153 }
 154
 155 AVCodec txd_decoder = {
 156     "txd",
 157     CODEC_TYPE_VIDEO,
 158     CODEC_ID_TXD,
 159     sizeof(TXDContext),
 160     txd_init,
 161     NULL,
 162     txd_end,
 163     txd_decode_frame,
 164     0,
 165     NULL,
 166     .long_name = "Renderware TXD (TeXture Dictionary) image",
 167 };