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libavcodec/txd.c

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00001 /*
00002  * Renderware TeXture Dictionary (.txd) image decoder
00003  * Copyright (c) 2007 Ivo van Poorten
00004  *
00005  * See also: http://wiki.multimedia.cx/index.php?title=TXD
00006  *
00007  * This file is part of FFmpeg.
00008  *
00009  * FFmpeg is free software; you can redistribute it and/or
00010  * modify it under the terms of the GNU Lesser General Public
00011  * License as published by the Free Software Foundation; either
00012  * version 2.1 of the License, or (at your option) any later version.
00013  *
00014  * FFmpeg is distributed in the hope that it will be useful,
00015  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00016  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00017  * Lesser General Public License for more details.
00018  *
00019  * You should have received a copy of the GNU Lesser General Public
00020  * License along with FFmpeg; if not, write to the Free Software
00021  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00022  */
00023 
00024 #include "libavutil/intreadwrite.h"
00025 #include "avcodec.h"
00026 #include "s3tc.h"
00027 
00028 typedef struct TXDContext {
00029     AVFrame picture;
00030 } TXDContext;
00031 
00032 static av_cold int txd_init(AVCodecContext *avctx) {
00033     TXDContext *s = avctx->priv_data;
00034 
00035     avcodec_get_frame_defaults(&s->picture);
00036     avctx->coded_frame = &s->picture;
00037 
00038     return 0;
00039 }
00040 
00041 static int txd_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
00042                             const uint8_t *buf, int buf_size) {
00043     TXDContext * const s = avctx->priv_data;
00044     AVFrame *picture = data;
00045     AVFrame * const p = &s->picture;
00046     unsigned int version, w, h, d3d_format, depth, stride, mipmap_count, flags;
00047     unsigned int y, v;
00048     uint8_t *ptr;
00049     const uint8_t *cur = buf;
00050     const uint32_t *palette = (const uint32_t *)(cur + 88);
00051     uint32_t *pal;
00052 
00053     version         = AV_RL32(cur);
00054     d3d_format      = AV_RL32(cur+76);
00055     w               = AV_RL16(cur+80);
00056     h               = AV_RL16(cur+82);
00057     depth           = AV_RL8 (cur+84);
00058     mipmap_count    = AV_RL8 (cur+85);
00059     flags           = AV_RL8 (cur+87);
00060     cur            += 92;
00061 
00062     if (version < 8 || version > 9) {
00063         av_log(avctx, AV_LOG_ERROR, "texture data version %i is unsupported\n",
00064                                                                     version);
00065         return -1;
00066     }
00067 
00068     if (depth == 8) {
00069         avctx->pix_fmt = PIX_FMT_PAL8;
00070         cur += 1024;
00071     } else if (depth == 16 || depth == 32)
00072         avctx->pix_fmt = PIX_FMT_RGB32;
00073     else {
00074         av_log(avctx, AV_LOG_ERROR, "depth of %i is unsupported\n", depth);
00075         return -1;
00076     }
00077 
00078     if (p->data[0])
00079         avctx->release_buffer(avctx, p);
00080 
00081     if (avcodec_check_dimensions(avctx, w, h))
00082         return -1;
00083     if (w != avctx->width || h != avctx->height)
00084         avcodec_set_dimensions(avctx, w, h);
00085     if (avctx->get_buffer(avctx, p) < 0) {
00086         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00087         return -1;
00088     }
00089 
00090     p->pict_type = FF_I_TYPE;
00091 
00092     ptr    = p->data[0];
00093     stride = p->linesize[0];
00094 
00095     if (depth == 8) {
00096         pal = (uint32_t *) p->data[1];
00097         for (y=0; y<256; y++) {
00098             v = AV_RB32(palette+y);
00099             pal[y] = (v>>8) + (v<<24);
00100         }
00101         for (y=0; y<h; y++) {
00102             memcpy(ptr, cur, w);
00103             ptr += stride;
00104             cur += w;
00105         }
00106     } else if (depth == 16) {
00107         switch (d3d_format) {
00108         case 0:
00109             if (!flags&1) goto unsupported;
00110         case FF_S3TC_DXT1:
00111             ff_decode_dxt1(cur, ptr, w, h, stride);
00112             break;
00113         case FF_S3TC_DXT3:
00114             ff_decode_dxt3(cur, ptr, w, h, stride);
00115             break;
00116         default:
00117             goto unsupported;
00118         }
00119     } else if (depth == 32) {
00120         switch (d3d_format) {
00121         case 0x15:
00122         case 0x16:
00123             for (y=0; y<h; y++) {
00124                 memcpy(ptr, cur, w*4);
00125                 ptr += stride;
00126                 cur += w*4;
00127             }
00128             break;
00129         default:
00130             goto unsupported;
00131         }
00132     }
00133 
00134     for (; mipmap_count > 1; mipmap_count--)
00135         cur += AV_RL32(cur) + 4;
00136 
00137     *picture   = s->picture;
00138     *data_size = sizeof(AVPicture);
00139 
00140     return cur - buf;
00141 
00142 unsupported:
00143     av_log(avctx, AV_LOG_ERROR, "unsupported d3d format (%08x)\n", d3d_format);
00144     return -1;
00145 }
00146 
00147 static av_cold int txd_end(AVCodecContext *avctx) {
00148     TXDContext *s = avctx->priv_data;
00149 
00150     if (s->picture.data[0])
00151         avctx->release_buffer(avctx, &s->picture);
00152 
00153     return 0;
00154 }
00155 
00156 AVCodec txd_decoder = {
00157     "txd",
00158     CODEC_TYPE_VIDEO,
00159     CODEC_ID_TXD,
00160     sizeof(TXDContext),
00161     txd_init,
00162     NULL,
00163     txd_end,
00164     txd_decode_frame,
00165     0,
00166     NULL,
00167     .long_name = NULL_IF_CONFIG_SMALL("Renderware TXD (TeXture Dictionary) image"),
00168 };

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