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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                             AVPacket *avpkt) {
00043     const uint8_t *buf = avpkt->data;
00044     TXDContext * const s = avctx->priv_data;
00045     AVFrame *picture = data;
00046     AVFrame * const p = &s->picture;
00047     unsigned int version, w, h, d3d_format, depth, stride, mipmap_count, flags;
00048     unsigned int y, v;
00049     uint8_t *ptr;
00050     const uint8_t *cur = buf;
00051     const uint32_t *palette = (const uint32_t *)(cur + 88);
00052     uint32_t *pal;
00053 
00054     version         = AV_RL32(cur);
00055     d3d_format      = AV_RL32(cur+76);
00056     w               = AV_RL16(cur+80);
00057     h               = AV_RL16(cur+82);
00058     depth           = AV_RL8 (cur+84);
00059     mipmap_count    = AV_RL8 (cur+85);
00060     flags           = AV_RL8 (cur+87);
00061     cur            += 92;
00062 
00063     if (version < 8 || version > 9) {
00064         av_log(avctx, AV_LOG_ERROR, "texture data version %i is unsupported\n",
00065                                                                     version);
00066         return -1;
00067     }
00068 
00069     if (depth == 8) {
00070         avctx->pix_fmt = PIX_FMT_PAL8;
00071         cur += 1024;
00072     } else if (depth == 16 || depth == 32)
00073         avctx->pix_fmt = PIX_FMT_RGB32;
00074     else {
00075         av_log(avctx, AV_LOG_ERROR, "depth of %i is unsupported\n", depth);
00076         return -1;
00077     }
00078 
00079     if (p->data[0])
00080         avctx->release_buffer(avctx, p);
00081 
00082     if (avcodec_check_dimensions(avctx, w, h))
00083         return -1;
00084     if (w != avctx->width || h != avctx->height)
00085         avcodec_set_dimensions(avctx, w, h);
00086     if (avctx->get_buffer(avctx, p) < 0) {
00087         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00088         return -1;
00089     }
00090 
00091     p->pict_type = FF_I_TYPE;
00092 
00093     ptr    = p->data[0];
00094     stride = p->linesize[0];
00095 
00096     if (depth == 8) {
00097         pal = (uint32_t *) p->data[1];
00098         for (y=0; y<256; y++) {
00099             v = AV_RB32(palette+y);
00100             pal[y] = (v>>8) + (v<<24);
00101         }
00102         for (y=0; y<h; y++) {
00103             memcpy(ptr, cur, w);
00104             ptr += stride;
00105             cur += w;
00106         }
00107     } else if (depth == 16) {
00108         switch (d3d_format) {
00109         case 0:
00110             if (!flags&1) goto unsupported;
00111         case FF_S3TC_DXT1:
00112             ff_decode_dxt1(cur, ptr, w, h, stride);
00113             break;
00114         case FF_S3TC_DXT3:
00115             ff_decode_dxt3(cur, ptr, w, h, stride);
00116             break;
00117         default:
00118             goto unsupported;
00119         }
00120     } else if (depth == 32) {
00121         switch (d3d_format) {
00122         case 0x15:
00123         case 0x16:
00124             for (y=0; y<h; y++) {
00125                 memcpy(ptr, cur, w*4);
00126                 ptr += stride;
00127                 cur += w*4;
00128             }
00129             break;
00130         default:
00131             goto unsupported;
00132         }
00133     }
00134 
00135     for (; mipmap_count > 1; mipmap_count--)
00136         cur += AV_RL32(cur) + 4;
00137 
00138     *picture   = s->picture;
00139     *data_size = sizeof(AVPicture);
00140 
00141     return cur - buf;
00142 
00143 unsupported:
00144     av_log(avctx, AV_LOG_ERROR, "unsupported d3d format (%08x)\n", d3d_format);
00145     return -1;
00146 }
00147 
00148 static av_cold int txd_end(AVCodecContext *avctx) {
00149     TXDContext *s = avctx->priv_data;
00150 
00151     if (s->picture.data[0])
00152         avctx->release_buffer(avctx, &s->picture);
00153 
00154     return 0;
00155 }
00156 
00157 AVCodec txd_decoder = {
00158     "txd",
00159     AVMEDIA_TYPE_VIDEO,
00160     CODEC_ID_TXD,
00161     sizeof(TXDContext),
00162     txd_init,
00163     NULL,
00164     txd_end,
00165     txd_decode_frame,
00166     CODEC_CAP_DR1,
00167     NULL,
00168     .long_name = NULL_IF_CONFIG_SMALL("Renderware TXD (TeXture Dictionary) image"),
00169 };

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