libavcodec/qdrw.c

   1 /*
   2  * QuickDraw (qdrw) codec
   3  * Copyright (c) 2004 Konstantin Shishkov
   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 /**
  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 typedef struct QdrawContext {
  33     AVCodecContext *avctx;
  34     AVFrame pic;
  35 } QdrawContext;
  36
  37 static int decode_frame(AVCodecContext *avctx,
  38                         void *data, int *got_frame,
  39                         AVPacket *avpkt)
  40 {
  41     const uint8_t *buf     = avpkt->data;
  42     const uint8_t *buf_end = avpkt->data + avpkt->size;
  43     int buf_size           = avpkt->size;
  44     QdrawContext * const a = avctx->priv_data;
  45     AVFrame * const p      = &a->pic;
  46     uint8_t* outdata;
  47     int colors;
  48     int i, ret;
  49     uint32_t *pal;
  50     int r, g, b;
  51
  52     if (p->data[0])
  53         avctx->release_buffer(avctx, p);
  54
  55     p->reference = 0;
  56     if ((ret = ff_get_buffer(avctx, p)) < 0) {
  57         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
  58         return ret;
  59     }
  60     p->pict_type = AV_PICTURE_TYPE_I;
  61     p->key_frame = 1;
  62
  63     outdata = a->pic.data[0];
  64
  65     if (buf_end - buf < 0x68 + 4)
  66         return AVERROR_INVALIDDATA;
  67     buf   += 0x68; /* jump to palette */
  68     colors = AV_RB32(buf);
  69     buf   += 4;
  70
  71     if (colors < 0 || colors > 256) {
  72         av_log(avctx, AV_LOG_ERROR, "Error color count - %i(0x%X)\n", colors, colors);
  73         return AVERROR_INVALIDDATA;
  74     }
  75     if (buf_end - buf < (colors + 1) * 8)
  76         return AVERROR_INVALIDDATA;
  77
  78     pal = (uint32_t*)p->data[1];
  79     for (i = 0; i <= colors; i++) {
  80         unsigned int idx;
  81         idx = AV_RB16(buf); /* color index */
  82         buf += 2;
  83
  84         if (idx > 255) {
  85             av_log(avctx, AV_LOG_ERROR, "Palette index out of range: %u\n", idx);
  86             buf += 6;
  87             continue;
  88         }
  89         r = *buf++;
  90         buf++;
  91         g = *buf++;
  92         buf++;
  93         b = *buf++;
  94         buf++;
  95         pal[idx] = (r << 16) | (g << 8) | b;
  96     }
  97     p->palette_has_changed = 1;
  98
  99     if (buf_end - buf < 18)
 100         return AVERROR_INVALIDDATA;
 101     buf += 18; /* skip unneeded data */
 102     for (i = 0; i < avctx->height; i++) {
 103         int size, left, code, pix;
 104         const uint8_t *next;
 105         uint8_t *out;
 106         int tsize = 0;
 107
 108         /* decode line */
 109         out  = outdata;
 110         size = AV_RB16(buf); /* size of packed line */
 111         buf += 2;
 112         if (buf_end - buf < size)
 113             return AVERROR_INVALIDDATA;
 114
 115         left = size;
 116         next = buf + size;
 117         while (left > 0) {
 118             code = *buf++;
 119             if (code & 0x80 ) { /* run */
 120                 pix = *buf++;
 121                 if ((out + (257 - code)) > (outdata +  a->pic.linesize[0]))
 122                     break;
 123                 memset(out, pix, 257 - code);
 124                 out   += 257 - code;
 125                 tsize += 257 - code;
 126                 left  -= 2;
 127             } else { /* copy */
 128                 if ((out + code) > (outdata +  a->pic.linesize[0]))
 129                     break;
 130                 if (buf_end - buf < code + 1)
 131                     return AVERROR_INVALIDDATA;
 132                 memcpy(out, buf, code + 1);
 133                 out   += code + 1;
 134                 buf   += code + 1;
 135                 left  -= 2 + code;
 136                 tsize += code + 1;
 137             }
 138         }
 139         buf = next;
 140         outdata += a->pic.linesize[0];
 141     }
 142
 143     *got_frame      = 1;
 144     *(AVFrame*)data = a->pic;
 145
 146     return buf_size;
 147 }
 148
 149 static av_cold int decode_init(AVCodecContext *avctx)
 150 {
 151     avctx->pix_fmt= AV_PIX_FMT_PAL8;
 152
 153     return 0;
 154 }
 155
 156 static av_cold int decode_end(AVCodecContext *avctx)
 157 {
 158     QdrawContext * const a = avctx->priv_data;
 159     AVFrame *pic = &a->pic;
 160
 161     if (pic->data[0])
 162         avctx->release_buffer(avctx, pic);
 163
 164     return 0;
 165 }
 166
 167 AVCodec ff_qdraw_decoder = {
 168     .name           = "qdraw",
 169     .type           = AVMEDIA_TYPE_VIDEO,
 170     .id             = AV_CODEC_ID_QDRAW,
 171     .priv_data_size = sizeof(QdrawContext),
 172     .init           = decode_init,
 173     .close          = decode_end,
 174     .decode         = decode_frame,
 175     .capabilities   = CODEC_CAP_DR1,
 176     .long_name      = NULL_IF_CONFIG_SMALL("Apple QuickDraw"),
 177 };