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