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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 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 = ff_set_dimensions(avctx, w, h)) < 0)
67  return ret;
68 
69  if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
70  return ret;
71 
73 
74  ptr = p->data[0];
75  stride = p->linesize[0];
76 
77  if (depth == 8) {
78  pal = (uint32_t *) p->data[1];
79  for (y = 0; y < 256; y++) {
80  v = bytestream2_get_be32(&gb);
81  pal[y] = (v >> 8) + (v << 24);
82  }
83  if (bytestream2_get_bytes_left(&gb) < w * h)
84  return AVERROR_INVALIDDATA;
85  bytestream2_skip(&gb, 4);
86  for (y=0; y<h; y++) {
87  bytestream2_get_buffer(&gb, ptr, w);
88  ptr += stride;
89  }
90  } else if (depth == 16) {
91  bytestream2_skip(&gb, 4);
92  switch (d3d_format) {
93  case 0:
94  if (!(flags & 1))
95  goto unsupported;
96  case FF_S3TC_DXT1:
97  if (bytestream2_get_bytes_left(&gb) < FF_CEIL_RSHIFT(w, 2) * FF_CEIL_RSHIFT(h, 2) * 8)
98  return AVERROR_INVALIDDATA;
99  ff_decode_dxt1(&gb, ptr, w, h, stride);
100  break;
101  case FF_S3TC_DXT3:
102  if (bytestream2_get_bytes_left(&gb) < FF_CEIL_RSHIFT(w, 2) * FF_CEIL_RSHIFT(h, 2) * 16)
103  return AVERROR_INVALIDDATA;
104  ff_decode_dxt3(&gb, ptr, w, h, stride);
105  break;
106  default:
107  goto unsupported;
108  }
109  } else if (depth == 32) {
110  switch (d3d_format) {
111  case 0x15:
112  case 0x16:
113  if (bytestream2_get_bytes_left(&gb) < h * w * 4)
114  return AVERROR_INVALIDDATA;
115  for (y=0; y<h; y++) {
116  bytestream2_get_buffer(&gb, ptr, w * 4);
117  ptr += stride;
118  }
119  break;
120  default:
121  goto unsupported;
122  }
123  }
124 
125  *got_frame = 1;
126 
127  return avpkt->size;
128 
130  av_log(avctx, AV_LOG_ERROR, "unsupported d3d format (%08x)\n", d3d_format);
131  return AVERROR_PATCHWELCOME;
132 }
133 
135  .name = "txd",
136  .long_name = NULL_IF_CONFIG_SMALL("Renderware TXD (TeXture Dictionary) image"),
137  .type = AVMEDIA_TYPE_VIDEO,
138  .id = AV_CODEC_ID_TXD,
139  .decode = txd_decode_frame,
140  .capabilities = CODEC_CAP_DR1,
141 };