txd.c
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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 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 "s3tc.h"
28 
29 typedef struct TXDContext {
31 } TXDContext;
32 
33 static av_cold int txd_init(AVCodecContext *avctx) {
34  TXDContext *s = avctx->priv_data;
35 
37  avctx->coded_frame = &s->picture;
38 
39  return 0;
40 }
41 
42 static int txd_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
43  AVPacket *avpkt) {
44  const uint8_t *buf = avpkt->data;
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 (av_image_check_size(w, h, 0, avctx))
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 
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))
112  goto unsupported;
113  case FF_S3TC_DXT1:
114  ff_decode_dxt1(cur, ptr, w, h, stride);
115  break;
116  case FF_S3TC_DXT3:
117  ff_decode_dxt3(cur, ptr, w, h, stride);
118  break;
119  default:
120  goto unsupported;
121  }
122  } else if (depth == 32) {
123  switch (d3d_format) {
124  case 0x15:
125  case 0x16:
126  for (y=0; y<h; y++) {
127  memcpy(ptr, cur, w*4);
128  ptr += stride;
129  cur += w*4;
130  }
131  break;
132  default:
133  goto unsupported;
134  }
135  }
136 
137  for (; mipmap_count > 1; mipmap_count--)
138  cur += AV_RL32(cur) + 4;
139 
140  *picture = s->picture;
141  *data_size = sizeof(AVPicture);
142 
143  return cur - buf;
144 
145 unsupported:
146  av_log(avctx, AV_LOG_ERROR, "unsupported d3d format (%08x)\n", d3d_format);
147  return -1;
148 }
149 
150 static av_cold int txd_end(AVCodecContext *avctx) {
151  TXDContext *s = avctx->priv_data;
152 
153  if (s->picture.data[0])
154  avctx->release_buffer(avctx, &s->picture);
155 
156  return 0;
157 }
158 
160  .name = "txd",
161  .type = AVMEDIA_TYPE_VIDEO,
162  .id = CODEC_ID_TXD,
163  .priv_data_size = sizeof(TXDContext),
164  .init = txd_init,
165  .close = txd_end,
167  .capabilities = CODEC_CAP_DR1,
168  .long_name = NULL_IF_CONFIG_SMALL("Renderware TXD (TeXture Dictionary) image"),
169 };