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 Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; 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/common.h"
  23 #include "libavutil/intreadwrite.h"
  24 #include "libavutil/imgutils.h"
  25 #include "avcodec.h"
  26 #include "internal.h"
  27 #include "sunrast.h"
  28
  29 static int sunrast_decode_frame(AVCodecContext *avctx, void *data,
  30                                 int *got_frame, AVPacket *avpkt)
  31 {
  32     const uint8_t *buf       = avpkt->data;
  33     const uint8_t *buf_end   = avpkt->data + avpkt->size;
  34     AVFrame * const p        = data;
  35     unsigned int w, h, depth, type, maptype, maplength, stride, x, y, len, alen;
  36     uint8_t *ptr;
  37     const uint8_t *bufstart = buf;
  38     int ret;
  39
  40     if (avpkt->size < 32)
  41         return AVERROR_INVALIDDATA;
  42
  43     if (AV_RB32(buf) != RAS_MAGIC) {
  44         av_log(avctx, AV_LOG_ERROR, "this is not sunras encoded data\n");
  45         return AVERROR_INVALIDDATA;
  46     }
  47
  48     w         = AV_RB32(buf + 4);
  49     h         = AV_RB32(buf + 8);
  50     depth     = AV_RB32(buf + 12);
  51     type      = AV_RB32(buf + 20);
  52     maptype   = AV_RB32(buf + 24);
  53     maplength = AV_RB32(buf + 28);
  54     buf      += 32;
  55
  56     if (type == RT_FORMAT_TIFF || type == RT_FORMAT_IFF || type == RT_EXPERIMENTAL) {
  57         avpriv_request_sample(avctx, "TIFF/IFF/EXPERIMENTAL (compression) type");
  58         return AVERROR_PATCHWELCOME;
  59     }
  60     if (type > RT_FORMAT_IFF) {
  61         av_log(avctx, AV_LOG_ERROR, "invalid (compression) type\n");
  62         return AVERROR_INVALIDDATA;
  63     }
  64     if (maptype == RMT_RAW) {
  65         avpriv_request_sample(avctx, "Unknown colormap type");
  66         return AVERROR_PATCHWELCOME;
  67     }
  68     if (maptype > RMT_RAW) {
  69         av_log(avctx, AV_LOG_ERROR, "invalid colormap type\n");
  70         return AVERROR_INVALIDDATA;
  71     }
  72
  73
  74     switch (depth) {
  75         case 1:
  76             avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
  77             break;
  78         case 8:
  79             avctx->pix_fmt = maplength ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_GRAY8;
  80             break;
  81         case 24:
  82             avctx->pix_fmt = (type == RT_FORMAT_RGB) ? AV_PIX_FMT_RGB24 : AV_PIX_FMT_BGR24;
  83             break;
  84         default:
  85             av_log(avctx, AV_LOG_ERROR, "invalid depth\n");
  86             return AVERROR_INVALIDDATA;
  87     }
  88
  89     ret = ff_set_dimensions(avctx, w, h);
  90     if (ret < 0)
  91         return ret;
  92
  93     if ((ret = ff_get_buffer(avctx, p, 0)) < 0) {
  94         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
  95         return ret;
  96     }
  97
  98     p->pict_type = AV_PICTURE_TYPE_I;
  99
 100     if (buf_end - buf < maplength)
 101         return AVERROR_INVALIDDATA;
 102
 103     if (depth != 8 && maplength) {
 104         av_log(avctx, AV_LOG_WARNING, "useless colormap found or file is corrupted, trying to recover\n");
 105
 106     } else if (maplength) {
 107         unsigned int len = maplength / 3;
 108
 109         if (maplength % 3 || maplength > 768) {
 110             av_log(avctx, AV_LOG_WARNING, "invalid colormap length\n");
 111             return AVERROR_INVALIDDATA;
 112         }
 113
 114         ptr = p->data[1];
 115         for (x = 0; x < len; x++, ptr += 4)
 116             *(uint32_t *)ptr = (buf[x] << 16) + (buf[len + x] << 8) + buf[len + len + x];
 117     }
 118
 119     buf += maplength;
 120
 121     ptr    = p->data[0];
 122     stride = p->linesize[0];
 123
 124     /* scanlines are aligned on 16 bit boundaries */
 125     len  = (depth * w + 7) >> 3;
 126     alen = len + (len & 1);
 127
 128     if (type == RT_BYTE_ENCODED) {
 129         int value, run;
 130         uint8_t *end = ptr + h * stride;
 131
 132         x = 0;
 133         while (ptr != end && buf < buf_end) {
 134             run = 1;
 135             if (buf_end - buf < 1)
 136                 return AVERROR_INVALIDDATA;
 137
 138             if ((value = *buf++) == RLE_TRIGGER) {
 139                 run = *buf++ + 1;
 140                 if (run != 1)
 141                     value = *buf++;
 142             }
 143             while (run--) {
 144                 if (x < len)
 145                     ptr[x] = value;
 146                 if (++x >= alen) {
 147                     x = 0;
 148                     ptr += stride;
 149                     if (ptr == end)
 150                         break;
 151                 }
 152             }
 153         }
 154     } else {
 155         for (y = 0; y < h; y++) {
 156             if (buf_end - buf < len)
 157                 break;
 158             memcpy(ptr, buf, len);
 159             ptr += stride;
 160             buf += alen;
 161         }
 162     }
 163
 164     *got_frame = 1;
 165
 166     return buf - bufstart;
 167 }
 168
 169 AVCodec ff_sunrast_decoder = {
 170     .name           = "sunrast",
 171     .long_name      = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"),
 172     .type           = AVMEDIA_TYPE_VIDEO,
 173     .id             = AV_CODEC_ID_SUNRAST,
 174     .decode         = sunrast_decode_frame,
 175     .capabilities   = AV_CODEC_CAP_DR1,
 176 };