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 "libavutil/intreadwrite.h"
  25 #include "avcodec.h"
  26 #include "s3tc.h"
  27
  28 typedef struct TXDContext {
  29     AVFrame picture;
  30 } TXDContext;
  31
  32 static av_cold int txd_init(AVCodecContext *avctx) {
  33     TXDContext *s = avctx->priv_data;
  34
  35     avcodec_get_frame_defaults(&s->picture);
  36     avctx->coded_frame = &s->picture;
  37
  38     return 0;
  39 }
  40
  41 static int txd_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
  42                             AVPacket *avpkt) {
  43     const uint8_t *buf = avpkt->data;
  44     int buf_size = avpkt->size;
  45     TXDContext * const s = avctx->priv_data;
  46     AVFrame *picture = data;
  47     AVFrame * const p = &s->picture;
  48     unsigned int version, w, h, d3d_format, depth, stride, mipmap_count, flags;
  49     unsigned int y, v;
  50     uint8_t *ptr;
  51     const uint8_t *cur = buf;
  52     const uint32_t *palette = (const uint32_t *)(cur + 88);
  53     uint32_t *pal;
  54
  55     version         = AV_RL32(cur);
  56     d3d_format      = AV_RL32(cur+76);
  57     w               = AV_RL16(cur+80);
  58     h               = AV_RL16(cur+82);
  59     depth           = AV_RL8 (cur+84);
  60     mipmap_count    = AV_RL8 (cur+85);
  61     flags           = AV_RL8 (cur+87);
  62     cur            += 92;
  63
  64     if (version < 8 || version > 9) {
  65         av_log(avctx, AV_LOG_ERROR, "texture data version %i is unsupported\n",
  66                                                                     version);
  67         return -1;
  68     }
  69
  70     if (depth == 8) {
  71         avctx->pix_fmt = PIX_FMT_PAL8;
  72         cur += 1024;
  73     } else if (depth == 16 || depth == 32)
  74         avctx->pix_fmt = PIX_FMT_RGB32;
  75     else {
  76         av_log(avctx, AV_LOG_ERROR, "depth of %i is unsupported\n", depth);
  77         return -1;
  78     }
  79
  80     if (p->data[0])
  81         avctx->release_buffer(avctx, p);
  82
  83     if (avcodec_check_dimensions(avctx, w, h))
  84         return -1;
  85     if (w != avctx->width || h != avctx->height)
  86         avcodec_set_dimensions(avctx, w, h);
  87     if (avctx->get_buffer(avctx, p) < 0) {
  88         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
  89         return -1;
  90     }
  91
  92     p->pict_type = FF_I_TYPE;
  93
  94     ptr    = p->data[0];
  95     stride = p->linesize[0];
  96
  97     if (depth == 8) {
  98         pal = (uint32_t *) p->data[1];
  99         for (y=0; y<256; y++) {
 100             v = AV_RB32(palette+y);
 101             pal[y] = (v>>8) + (v<<24);
 102         }
 103         for (y=0; y<h; y++) {
 104             memcpy(ptr, cur, w);
 105             ptr += stride;
 106             cur += w;
 107         }
 108     } else if (depth == 16) {
 109         switch (d3d_format) {
 110         case 0:
 111             if (!flags&1) goto unsupported;
 112         case FF_S3TC_DXT1:
 113             ff_decode_dxt1(cur, ptr, w, h, stride);
 114             break;
 115         case FF_S3TC_DXT3:
 116             ff_decode_dxt3(cur, ptr, w, h, stride);
 117             break;
 118         default:
 119             goto unsupported;
 120         }
 121     } else if (depth == 32) {
 122         switch (d3d_format) {
 123         case 0x15:
 124         case 0x16:
 125             for (y=0; y<h; y++) {
 126                 memcpy(ptr, cur, w*4);
 127                 ptr += stride;
 128                 cur += w*4;
 129             }
 130             break;
 131         default:
 132             goto unsupported;
 133         }
 134     }
 135
 136     for (; mipmap_count > 1; mipmap_count--)
 137         cur += AV_RL32(cur) + 4;
 138
 139     *picture   = s->picture;
 140     *data_size = sizeof(AVPicture);
 141
 142     return cur - buf;
 143
 144 unsupported:
 145     av_log(avctx, AV_LOG_ERROR, "unsupported d3d format (%08x)\n", d3d_format);
 146     return -1;
 147 }
 148
 149 static av_cold int txd_end(AVCodecContext *avctx) {
 150     TXDContext *s = avctx->priv_data;
 151
 152     if (s->picture.data[0])
 153         avctx->release_buffer(avctx, &s->picture);
 154
 155     return 0;
 156 }
 157
 158 AVCodec txd_decoder = {
 159     "txd",
 160     CODEC_TYPE_VIDEO,
 161     CODEC_ID_TXD,
 162     sizeof(TXDContext),
 163     txd_init,
 164     NULL,
 165     txd_end,
 166     txd_decode_frame,
 167     0,
 168     NULL,
 169     .long_name = NULL_IF_CONFIG_SMALL("Renderware TXD (TeXture Dictionary) image"),
 170 };