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, AVPacket *avpkt) {
  47     const uint8_t *buf = avpkt->data;
  48     SUNRASTContext * const s = avctx->priv_data;
  49     AVFrame *picture = data;
  50     AVFrame * const p = &s->picture;
  51     unsigned int w, h, depth, type, maptype, maplength, stride, x, y, len, alen;
  52     uint8_t *ptr;
  53     const uint8_t *bufstart = buf;
  54
  55     if (AV_RB32(buf) != 0x59a66a95) {
  56         av_log(avctx, AV_LOG_ERROR, "this is not sunras encoded data\n");
  57         return -1;
  58     }
  59
  60     w         = AV_RB32(buf+4);
  61     h         = AV_RB32(buf+8);
  62     depth     = AV_RB32(buf+12);
  63     type      = AV_RB32(buf+20);
  64     maptype   = AV_RB32(buf+24);
  65     maplength = AV_RB32(buf+28);
  66
  67     if (type > RT_BYTE_ENCODED && type <= RT_FORMAT_IFF) {
  68         av_log(avctx, AV_LOG_ERROR, "unsupported (compression) type\n");
  69         return -1;
  70     }
  71     if (type > RT_FORMAT_IFF) {
  72         av_log(avctx, AV_LOG_ERROR, "invalid (compression) type\n");
  73         return -1;
  74     }
  75     if (maptype & ~1) {
  76         av_log(avctx, AV_LOG_ERROR, "invalid colormap type\n");
  77         return -1;
  78     }
  79
  80     buf += 32;
  81
  82     switch (depth) {
  83         case 1:
  84             avctx->pix_fmt = PIX_FMT_MONOWHITE;
  85             break;
  86         case 8:
  87             avctx->pix_fmt = PIX_FMT_PAL8;
  88             break;
  89         case 24:
  90             avctx->pix_fmt = PIX_FMT_BGR24;
  91             break;
  92         default:
  93             av_log(avctx, AV_LOG_ERROR, "invalid depth\n");
  94             return -1;
  95     }
  96
  97     if (p->data[0])
  98         avctx->release_buffer(avctx, p);
  99
 100     if (avcodec_check_dimensions(avctx, w, h))
 101         return -1;
 102     if (w != avctx->width || h != avctx->height)
 103         avcodec_set_dimensions(avctx, w, h);
 104     if (avctx->get_buffer(avctx, p) < 0) {
 105         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 106         return -1;
 107     }
 108
 109     p->pict_type = FF_I_TYPE;
 110
 111     if (depth != 8 && maplength) {
 112         av_log(avctx, AV_LOG_WARNING, "useless colormap found or file is corrupted, trying to recover\n");
 113
 114     } else if (depth == 8) {
 115         unsigned int len = maplength / 3;
 116
 117         if (!maplength) {
 118             av_log(avctx, AV_LOG_ERROR, "colormap expected\n");
 119             return -1;
 120         }
 121         if (maplength % 3 || maplength > 768) {
 122             av_log(avctx, AV_LOG_WARNING, "invalid colormap length\n");
 123             return -1;
 124         }
 125
 126         ptr = p->data[1];
 127         for (x=0; x<len; x++, ptr+=4)
 128             *(uint32_t *)ptr = (buf[x]<<16) + (buf[len+x]<<8) + buf[len+len+x];
 129     }
 130
 131     buf += maplength;
 132
 133     ptr    = p->data[0];
 134     stride = p->linesize[0];
 135
 136     /* scanlines are aligned on 16 bit boundaries */
 137     len  = (depth * w + 7) >> 3;
 138     alen = len + (len&1);
 139
 140     if (type == RT_BYTE_ENCODED) {
 141         int value, run;
 142         uint8_t *end = ptr + h*stride;
 143
 144         x = 0;
 145         while (ptr != end) {
 146             run = 1;
 147             if ((value = *buf++) == 0x80) {
 148                 run = *buf++ + 1;
 149                 if (run != 1)
 150                     value = *buf++;
 151             }
 152             while (run--) {
 153                 if (x < len)
 154                     ptr[x] = value;
 155                 if (++x >= alen) {
 156                     x = 0;
 157                     ptr += stride;
 158                     if (ptr == end)
 159                         break;
 160                 }
 161             }
 162         }
 163     } else {
 164         for (y=0; y<h; y++) {
 165             memcpy(ptr, buf, len);
 166             ptr += stride;
 167             buf += alen;
 168         }
 169     }
 170
 171     *picture = s->picture;
 172     *data_size = sizeof(AVFrame);
 173
 174     return buf - bufstart;
 175 }
 176
 177 static av_cold int sunrast_end(AVCodecContext *avctx) {
 178     SUNRASTContext *s = avctx->priv_data;
 179
 180     if(s->picture.data[0])
 181         avctx->release_buffer(avctx, &s->picture);
 182
 183     return 0;
 184 }
 185
 186 AVCodec sunrast_decoder = {
 187     "sunrast",
 188     CODEC_TYPE_VIDEO,
 189     CODEC_ID_SUNRAST,
 190     sizeof(SUNRASTContext),
 191     sunrast_init,
 192     NULL,
 193     sunrast_end,
 194     sunrast_decode_frame,
 195     CODEC_CAP_DR1,
 196     NULL,
 197     .long_name = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"),
 198 };