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 "libavutil/intreadwrite.h"
  23 #include "avcodec.h"
  24
  25 #define RT_OLD          0
  26 #define RT_STANDARD     1
  27 #define RT_BYTE_ENCODED 2
  28 #define RT_FORMAT_RGB   3
  29 #define RT_FORMAT_TIFF  4
  30 #define RT_FORMAT_IFF   5
  31
  32 typedef struct SUNRASTContext {
  33     AVFrame picture;
  34 } SUNRASTContext;
  35
  36 static av_cold int sunrast_init(AVCodecContext *avctx) {
  37     SUNRASTContext *s = avctx->priv_data;
  38
  39     avcodec_get_frame_defaults(&s->picture);
  40     avctx->coded_frame= &s->picture;
  41
  42     return 0;
  43 }
  44
  45 static int sunrast_decode_frame(AVCodecContext *avctx, void *data,
  46                                 int *data_size, const uint8_t *buf, int buf_size) {
  47     SUNRASTContext * const s = avctx->priv_data;
  48     AVFrame *picture = data;
  49     AVFrame * const p = &s->picture;
  50     unsigned int w, h, depth, type, maptype, maplength, stride, x, y, len, alen;
  51     uint8_t *ptr;
  52     const uint8_t *bufstart = buf;
  53
  54     if (AV_RB32(buf) != 0x59a66a95) {
  55         av_log(avctx, AV_LOG_ERROR, "this is not sunras encoded data\n");
  56         return -1;
  57     }
  58
  59     w         = AV_RB32(buf+4);
  60     h         = AV_RB32(buf+8);
  61     depth     = AV_RB32(buf+12);
  62     type      = AV_RB32(buf+20);
  63     maptype   = AV_RB32(buf+24);
  64     maplength = AV_RB32(buf+28);
  65
  66     if (type > RT_BYTE_ENCODED && type <= RT_FORMAT_IFF) {
  67         av_log(avctx, AV_LOG_ERROR, "unsupported (compression) type\n");
  68         return -1;
  69     }
  70     if (type > RT_FORMAT_IFF) {
  71         av_log(avctx, AV_LOG_ERROR, "invalid (compression) type\n");
  72         return -1;
  73     }
  74     if (maptype & ~1) {
  75         av_log(avctx, AV_LOG_ERROR, "invalid colormap type\n");
  76         return -1;
  77     }
  78
  79     buf += 32;
  80
  81     switch (depth) {
  82         case 1:
  83             avctx->pix_fmt = PIX_FMT_MONOWHITE;
  84             break;
  85         case 8:
  86             avctx->pix_fmt = PIX_FMT_PAL8;
  87             break;
  88         case 24:
  89             avctx->pix_fmt = PIX_FMT_BGR24;
  90             break;
  91         default:
  92             av_log(avctx, AV_LOG_ERROR, "invalid depth\n");
  93             return -1;
  94     }
  95
  96     if (p->data[0])
  97         avctx->release_buffer(avctx, p);
  98
  99     if (avcodec_check_dimensions(avctx, w, h))
 100         return -1;
 101     if (w != avctx->width || h != avctx->height)
 102         avcodec_set_dimensions(avctx, w, h);
 103     if (avctx->get_buffer(avctx, p) < 0) {
 104         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 105         return -1;
 106     }
 107
 108     p->pict_type = FF_I_TYPE;
 109
 110     if (depth != 8 && maplength) {
 111         av_log(avctx, AV_LOG_WARNING, "useless colormap found or file is corrupted, trying to recover\n");
 112
 113     } else if (depth == 8) {
 114         unsigned int len = maplength / 3;
 115
 116         if (!maplength) {
 117             av_log(avctx, AV_LOG_ERROR, "colormap expected\n");
 118             return -1;
 119         }
 120         if (maplength % 3 || maplength > 768) {
 121             av_log(avctx, AV_LOG_WARNING, "invalid colormap length\n");
 122             return -1;
 123         }
 124
 125         ptr = p->data[1];
 126         for (x=0; x<len; x++, ptr+=4)
 127             *(uint32_t *)ptr = (buf[x]<<16) + (buf[len+x]<<8) + buf[len+len+x];
 128     }
 129
 130     buf += maplength;
 131
 132     ptr    = p->data[0];
 133     stride = p->linesize[0];
 134
 135     /* scanlines are aligned on 16 bit boundaries */
 136     len  = (depth * w + 7) >> 3;
 137     alen = len + (len&1);
 138
 139     if (type == RT_BYTE_ENCODED) {
 140         int value, run;
 141         uint8_t *end = ptr + h*stride;
 142
 143         x = 0;
 144         while (ptr != end) {
 145             run = 1;
 146             if ((value = *buf++) == 0x80) {
 147                 run = *buf++ + 1;
 148                 if (run != 1)
 149                     value = *buf++;
 150             }
 151             while (run--) {
 152                 if (x < len)
 153                     ptr[x] = value;
 154                 if (++x >= alen) {
 155                     x = 0;
 156                     ptr += stride;
 157                     if (ptr == end)
 158                         break;
 159                 }
 160             }
 161         }
 162     } else {
 163         for (y=0; y<h; y++) {
 164             memcpy(ptr, buf, len);
 165             ptr += stride;
 166             buf += alen;
 167         }
 168     }
 169
 170     *picture = s->picture;
 171     *data_size = sizeof(AVFrame);
 172
 173     return buf - bufstart;
 174 }
 175
 176 static av_cold int sunrast_end(AVCodecContext *avctx) {
 177     SUNRASTContext *s = avctx->priv_data;
 178
 179     if(s->picture.data[0])
 180         avctx->release_buffer(avctx, &s->picture);
 181
 182     return 0;
 183 }
 184
 185 AVCodec sunrast_decoder = {
 186     "sunrast",
 187     CODEC_TYPE_VIDEO,
 188     CODEC_ID_SUNRAST,
 189     sizeof(SUNRASTContext),
 190     sunrast_init,
 191     NULL,
 192     sunrast_end,
 193     sunrast_decode_frame,
 194     0,
 195     NULL,
 196     .long_name = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"),
 197 };