libavcodec/sunrast.c

   1 /*
   2  * Sun Rasterfile (.sun/.ras/im{1,8,24}/.sunras) image decoder
   3  * Copyright (c) 2007, 2008 Ivo van Poorten
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "avcodec.h"
  23
  24 #define RT_OLD          0
  25 #define RT_STANDARD     1
  26 #define RT_BYTE_ENCODED 2
  27 #define RT_FORMAT_RGB   3
  28 #define RT_FORMAT_TIFF  4
  29 #define RT_FORMAT_IFF   5
  30
  31 typedef struct SUNRASTContext {
  32     AVFrame picture;
  33 } SUNRASTContext;
  34
  35 static int sunrast_init(AVCodecContext *avctx) {
  36     SUNRASTContext *s = avctx->priv_data;
  37
  38     avcodec_get_frame_defaults(&s->picture);
  39     avctx->coded_frame= &s->picture;
  40
  41     return 0;
  42 }
  43
  44 static int sunrast_decode_frame(AVCodecContext *avctx, void *data,
  45                                 int *data_size, uint8_t *buf, int buf_size) {
  46     SUNRASTContext * const s = avctx->priv_data;
  47     AVFrame *picture = data;
  48     AVFrame * const p = &s->picture;
  49     unsigned int w, h, depth, type, maptype, maplength, stride, x, y, len, alen;
  50     uint8_t *ptr, *bufstart = buf;
  51
  52     if (AV_RB32(buf) != 0x59a66a95) {
  53         av_log(avctx, AV_LOG_ERROR, "this is not sunras encoded data\n");
  54         return -1;
  55     }
  56
  57     w         = AV_RB32(buf+4);
  58     h         = AV_RB32(buf+8);
  59     depth     = AV_RB32(buf+12);
  60     type      = AV_RB32(buf+20);
  61     maptype   = AV_RB32(buf+24);
  62     maplength = AV_RB32(buf+28);
  63
  64     if (type > RT_BYTE_ENCODED && type <= RT_FORMAT_IFF) {
  65         av_log(avctx, AV_LOG_ERROR, "unsupported (compression) type\n");
  66         return -1;
  67     }
  68     if (type > RT_FORMAT_IFF) {
  69         av_log(avctx, AV_LOG_ERROR, "invalid (compression) type\n");
  70         return -1;
  71     }
  72     if (maptype & ~1) {
  73         av_log(avctx, AV_LOG_ERROR, "invalid colormap type\n");
  74         return -1;
  75     }
  76
  77     buf += 32;
  78
  79     switch (depth) {
  80         case 1:
  81             avctx->pix_fmt = PIX_FMT_MONOWHITE;
  82             break;
  83         case 8:
  84             avctx->pix_fmt = PIX_FMT_PAL8;
  85             break;
  86         case 24:
  87             avctx->pix_fmt = PIX_FMT_BGR24;
  88             break;
  89         default:
  90             av_log(avctx, AV_LOG_ERROR, "invalid depth\n");
  91             return -1;
  92     }
  93
  94     if (p->data[0])
  95         avctx->release_buffer(avctx, p);
  96
  97     if (avcodec_check_dimensions(avctx, w, h))
  98         return -1;
  99     if (w != avctx->width || h != avctx->height)
 100         avcodec_set_dimensions(avctx, w, h);
 101     if (avctx->get_buffer(avctx, p) < 0) {
 102         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 103         return -1;
 104     }
 105
 106     p->pict_type = FF_I_TYPE;
 107
 108     if (depth != 8 && maplength) {
 109         av_log(avctx, AV_LOG_WARNING, "useless colormap found or file is corrupted, trying to recover\n");
 110
 111     } else if (depth == 8) {
 112         unsigned int len = maplength / 3;
 113
 114         if (!maplength) {
 115             av_log(avctx, AV_LOG_ERROR, "colormap expected\n");
 116             return -1;
 117         }
 118         if (maplength % 3 || maplength > 768) {
 119             av_log(avctx, AV_LOG_WARNING, "invalid colormap length\n");
 120             return -1;
 121         }
 122
 123         ptr = p->data[1];
 124         for (x=0; x<len; x++, ptr+=4)
 125             *(uint32_t *)ptr = (buf[x]<<16) + (buf[len+x]<<8) + buf[len+len+x];
 126     }
 127
 128     buf += maplength;
 129
 130     ptr    = p->data[0];
 131     stride = p->linesize[0];
 132
 133     /* scanlines are aligned on 16 bit boundaries */
 134     len  = (depth * w + 7) >> 3;
 135     alen = len + (len&1);
 136
 137     if (type == RT_BYTE_ENCODED) {
 138         int value, run;
 139         uint8_t *end = ptr + h*stride;
 140
 141         x = 0;
 142         while (ptr != end) {
 143             run = 1;
 144             if ((value = *buf++) == 0x80) {
 145                 run = *buf++ + 1;
 146                 if (run != 1)
 147                     value = *buf++;
 148             }
 149             while (run--) {
 150                 if (x < len)
 151                     ptr[x] = value;
 152                 if (++x >= alen) {
 153                     x = 0;
 154                     ptr += stride;
 155                     if (ptr == end)
 156                         break;
 157                 }
 158             }
 159         }
 160     } else {
 161         for (y=0; y<h; y++) {
 162             memcpy(ptr, buf, len);
 163             ptr += stride;
 164             buf += alen;
 165         }
 166     }
 167
 168     *picture = s->picture;
 169     *data_size = sizeof(AVFrame);
 170
 171     return buf - bufstart;
 172 }
 173
 174 static int sunrast_end(AVCodecContext *avctx) {
 175     SUNRASTContext *s = avctx->priv_data;
 176
 177     if(s->picture.data[0])
 178         avctx->release_buffer(avctx, &s->picture);
 179
 180     return 0;
 181 }
 182
 183 AVCodec sunrast_decoder = {
 184     "sunrast",
 185     CODEC_TYPE_VIDEO,
 186     CODEC_ID_SUNRAST,
 187     sizeof(SUNRASTContext),
 188     sunrast_init,
 189     NULL,
 190     sunrast_end,
 191     sunrast_decode_frame,
 192     0,
 193     NULL
 194 };