ffmpeg/libavcodec/qdrw.c

   1 /*
   2  * QuickDraw (qdrw) codec
   3  * Copyright (c) 2004 Konstantin Shishkov
   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 /**
  23  * @file
  24  * Apple QuickDraw codec.
  25  */
  26
  27 #include "libavutil/common.h"
  28 #include "libavutil/intreadwrite.h"
  29 #include "avcodec.h"
  30 #include "internal.h"
  31
  32 static int decode_frame(AVCodecContext *avctx,
  33                         void *data, int *got_frame,
  34                         AVPacket *avpkt)
  35 {
  36     const uint8_t *buf     = avpkt->data;
  37     const uint8_t *buf_end = avpkt->data + avpkt->size;
  38     int buf_size           = avpkt->size;
  39     AVFrame * const p      = data;
  40     uint8_t* outdata;
  41     int colors;
  42     int i, ret;
  43     uint32_t *pal;
  44     int r, g, b;
  45
  46     if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
  47         return ret;
  48     p->pict_type = AV_PICTURE_TYPE_I;
  49     p->key_frame = 1;
  50
  51     outdata = p->data[0];
  52
  53     if (buf_end - buf < 0x68 + 4)
  54         return AVERROR_INVALIDDATA;
  55     buf   += 0x68; /* jump to palette */
  56     colors = AV_RB32(buf);
  57     buf   += 4;
  58
  59     if (colors < 0 || colors > 256) {
  60         av_log(avctx, AV_LOG_ERROR, "Error color count - %i(0x%X)\n", colors, colors);
  61         return AVERROR_INVALIDDATA;
  62     }
  63     if (buf_end - buf < (colors + 1) * 8)
  64         return AVERROR_INVALIDDATA;
  65
  66     pal = (uint32_t*)p->data[1];
  67     for (i = 0; i <= colors; i++) {
  68         unsigned int idx;
  69         idx = AV_RB16(buf); /* color index */
  70         buf += 2;
  71
  72         if (idx > 255) {
  73             av_log(avctx, AV_LOG_ERROR, "Palette index out of range: %u\n", idx);
  74             buf += 6;
  75             continue;
  76         }
  77         r = *buf++;
  78         buf++;
  79         g = *buf++;
  80         buf++;
  81         b = *buf++;
  82         buf++;
  83         pal[idx] = 0xFFU << 24 | r << 16 | g << 8 | b;
  84     }
  85     p->palette_has_changed = 1;
  86
  87     if (buf_end - buf < 18)
  88         return AVERROR_INVALIDDATA;
  89     buf += 18; /* skip unneeded data */
  90     for (i = 0; i < avctx->height; i++) {
  91         int size, left, code, pix;
  92         const uint8_t *next;
  93         uint8_t *out;
  94         int tsize = 0;
  95
  96         /* decode line */
  97         out  = outdata;
  98         size = AV_RB16(buf); /* size of packed line */
  99         buf += 2;
 100         if (buf_end - buf < size)
 101             return AVERROR_INVALIDDATA;
 102
 103         left = size;
 104         next = buf + size;
 105         while (left > 0) {
 106             code = *buf++;
 107             if (code & 0x80 ) { /* run */
 108                 pix = *buf++;
 109                 if ((out + (257 - code)) > (outdata +  p->linesize[0]))
 110                     break;
 111                 memset(out, pix, 257 - code);
 112                 out   += 257 - code;
 113                 tsize += 257 - code;
 114                 left  -= 2;
 115             } else { /* copy */
 116                 if ((out + code) > (outdata +  p->linesize[0]))
 117                     break;
 118                 if (buf_end - buf < code + 1)
 119                     return AVERROR_INVALIDDATA;
 120                 memcpy(out, buf, code + 1);
 121                 out   += code + 1;
 122                 buf   += code + 1;
 123                 left  -= 2 + code;
 124                 tsize += code + 1;
 125             }
 126         }
 127         buf = next;
 128         outdata += p->linesize[0];
 129     }
 130
 131     *got_frame      = 1;
 132
 133     return buf_size;
 134 }
 135
 136 static av_cold int decode_init(AVCodecContext *avctx)
 137 {
 138     avctx->pix_fmt= AV_PIX_FMT_PAL8;
 139
 140     return 0;
 141 }
 142
 143 AVCodec ff_qdraw_decoder = {
 144     .name           = "qdraw",
 145     .long_name      = NULL_IF_CONFIG_SMALL("Apple QuickDraw"),
 146     .type           = AVMEDIA_TYPE_VIDEO,
 147     .id             = AV_CODEC_ID_QDRAW,
 148     .init           = decode_init,
 149     .decode         = decode_frame,
 150     .capabilities   = CODEC_CAP_DR1,
 151 };