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 av_cold 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, const 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;
  51     const uint8_t *bufstart = buf;
  52
  53     if (AV_RB32(buf) != 0x59a66a95) {
  54         av_log(avctx, AV_LOG_ERROR, "this is not sunras encoded data\n");
  55         return -1;
  56     }
  57
  58     w         = AV_RB32(buf+4);
  59     h         = AV_RB32(buf+8);
  60     depth     = AV_RB32(buf+12);
  61     type      = AV_RB32(buf+20);
  62     maptype   = AV_RB32(buf+24);
  63     maplength = AV_RB32(buf+28);
  64
  65     if (type > RT_BYTE_ENCODED && type <= RT_FORMAT_IFF) {
  66         av_log(avctx, AV_LOG_ERROR, "unsupported (compression) type\n");
  67         return -1;
  68     }
  69     if (type > RT_FORMAT_IFF) {
  70         av_log(avctx, AV_LOG_ERROR, "invalid (compression) type\n");
  71         return -1;
  72     }
  73     if (maptype & ~1) {
  74         av_log(avctx, AV_LOG_ERROR, "invalid colormap type\n");
  75         return -1;
  76     }
  77
  78     buf += 32;
  79
  80     switch (depth) {
  81         case 1:
  82             avctx->pix_fmt = PIX_FMT_MONOWHITE;
  83             break;
  84         case 8:
  85             avctx->pix_fmt = PIX_FMT_PAL8;
  86             break;
  87         case 24:
  88             avctx->pix_fmt = PIX_FMT_BGR24;
  89             break;
  90         default:
  91             av_log(avctx, AV_LOG_ERROR, "invalid depth\n");
  92             return -1;
  93     }
  94
  95     if (p->data[0])
  96         avctx->release_buffer(avctx, p);
  97
  98     if (avcodec_check_dimensions(avctx, w, h))
  99         return -1;
 100     if (w != avctx->width || h != avctx->height)
 101         avcodec_set_dimensions(avctx, w, h);
 102     if (avctx->get_buffer(avctx, p) < 0) {
 103         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 104         return -1;
 105     }
 106
 107     p->pict_type = FF_I_TYPE;
 108
 109     if (depth != 8 && maplength) {
 110         av_log(avctx, AV_LOG_WARNING, "useless colormap found or file is corrupted, trying to recover\n");
 111
 112     } else if (depth == 8) {
 113         unsigned int len = maplength / 3;
 114
 115         if (!maplength) {
 116             av_log(avctx, AV_LOG_ERROR, "colormap expected\n");
 117             return -1;
 118         }
 119         if (maplength % 3 || maplength > 768) {
 120             av_log(avctx, AV_LOG_WARNING, "invalid colormap length\n");
 121             return -1;
 122         }
 123
 124         ptr = p->data[1];
 125         for (x=0; x<len; x++, ptr+=4)
 126             *(uint32_t *)ptr = (buf[x]<<16) + (buf[len+x]<<8) + buf[len+len+x];
 127     }
 128
 129     buf += maplength;
 130
 131     ptr    = p->data[0];
 132     stride = p->linesize[0];
 133
 134     /* scanlines are aligned on 16 bit boundaries */
 135     len  = (depth * w + 7) >> 3;
 136     alen = len + (len&1);
 137
 138     if (type == RT_BYTE_ENCODED) {
 139         int value, run;
 140         uint8_t *end = ptr + h*stride;
 141
 142         x = 0;
 143         while (ptr != end) {
 144             run = 1;
 145             if ((value = *buf++) == 0x80) {
 146                 run = *buf++ + 1;
 147                 if (run != 1)
 148                     value = *buf++;
 149             }
 150             while (run--) {
 151                 if (x < len)
 152                     ptr[x] = value;
 153                 if (++x >= alen) {
 154                     x = 0;
 155                     ptr += stride;
 156                     if (ptr == end)
 157                         break;
 158                 }
 159             }
 160         }
 161     } else {
 162         for (y=0; y<h; y++) {
 163             memcpy(ptr, buf, len);
 164             ptr += stride;
 165             buf += alen;
 166         }
 167     }
 168
 169     *picture = s->picture;
 170     *data_size = sizeof(AVFrame);
 171
 172     return buf - bufstart;
 173 }
 174
 175 static av_cold int sunrast_end(AVCodecContext *avctx) {
 176     SUNRASTContext *s = avctx->priv_data;
 177
 178     if(s->picture.data[0])
 179         avctx->release_buffer(avctx, &s->picture);
 180
 181     return 0;
 182 }
 183
 184 AVCodec sunrast_decoder = {
 185     "sunrast",
 186     CODEC_TYPE_VIDEO,
 187     CODEC_ID_SUNRAST,
 188     sizeof(SUNRASTContext),
 189     sunrast_init,
 190     NULL,
 191     sunrast_end,
 192     sunrast_decode_frame,
 193     0,
 194     NULL,
 195     .long_name = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"),
 196 };