Subversion Repositories Kolibri OS

Rev

Go to most recent revision | Blame | Last modification | View Log | RSS feed

  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. };
  152.