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 qdrw.c
  24  * Apple QuickDraw codec.
  25  */
  26
  27 #include "avcodec.h"
  28
  29 typedef struct QdrawContext{
  30     AVCodecContext *avctx;
  31     AVFrame pic;
  32 } QdrawContext;
  33
  34 static int decode_frame(AVCodecContext *avctx,
  35                         void *data, int *data_size,
  36                         const uint8_t *buf, int buf_size)
  37 {
  38     QdrawContext * const a = avctx->priv_data;
  39     AVFrame * const p= (AVFrame*)&a->pic;
  40     uint8_t* outdata;
  41     int colors;
  42     int i;
  43     uint32_t *pal;
  44     int r, g, b;
  45
  46     if(p->data[0])
  47         avctx->release_buffer(avctx, p);
  48
  49     p->reference= 0;
  50     if(avctx->get_buffer(avctx, p) < 0){
  51         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
  52         return -1;
  53     }
  54     p->pict_type= FF_I_TYPE;
  55     p->key_frame= 1;
  56
  57     outdata = a->pic.data[0];
  58
  59     buf += 0x68; /* jump to palette */
  60     colors = AV_RB32(buf);
  61     buf += 4;
  62
  63     if(colors < 0 || colors > 256) {
  64         av_log(avctx, AV_LOG_ERROR, "Error color count - %i(0x%X)\n", colors, colors);
  65         return -1;
  66     }
  67
  68     pal = (uint32_t*)p->data[1];
  69     for (i = 0; i <= colors; i++) {
  70         unsigned int idx;
  71         idx = AV_RB16(buf); /* color index */
  72         buf += 2;
  73
  74         if (idx > 255) {
  75             av_log(avctx, AV_LOG_ERROR, "Palette index out of range: %u\n", idx);
  76             buf += 6;
  77             continue;
  78         }
  79         r = *buf++;
  80         buf++;
  81         g = *buf++;
  82         buf++;
  83         b = *buf++;
  84         buf++;
  85         pal[idx] = (r << 16) | (g << 8) | b;
  86     }
  87     p->palette_has_changed = 1;
  88
  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         left = size;
 101         next = buf + size;
 102         while (left > 0) {
 103             code = *buf++;
 104             if (code & 0x80 ) { /* run */
 105                 pix = *buf++;
 106                 if ((out + (257 - code)) > (outdata +  a->pic.linesize[0]))
 107                     break;
 108                 memset(out, pix, 257 - code);
 109                 out += 257 - code;
 110                 tsize += 257 - code;
 111                 left -= 2;
 112             } else { /* copy */
 113                 if ((out + code) > (outdata +  a->pic.linesize[0]))
 114                     break;
 115                 memcpy(out, buf, code + 1);
 116                 out += code + 1;
 117                 buf += code + 1;
 118                 left -= 2 + code;
 119                 tsize += code + 1;
 120             }
 121         }
 122         buf = next;
 123         outdata += a->pic.linesize[0];
 124     }
 125
 126     *data_size = sizeof(AVFrame);
 127     *(AVFrame*)data = a->pic;
 128
 129     return buf_size;
 130 }
 131
 132 static av_cold int decode_init(AVCodecContext *avctx){
 133 //    QdrawContext * const a = avctx->priv_data;
 134
 135     if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
 136         return 1;
 137     }
 138
 139     avctx->pix_fmt= PIX_FMT_PAL8;
 140
 141     return 0;
 142 }
 143
 144 AVCodec qdraw_decoder = {
 145     "qdraw",
 146     CODEC_TYPE_VIDEO,
 147     CODEC_ID_QDRAW,
 148     sizeof(QdrawContext),
 149     decode_init,
 150     NULL,
 151     NULL,
 152     decode_frame,
 153     CODEC_CAP_DR1,
 154     .long_name = NULL_IF_CONFIG_SMALL("Apple QuickDraw"),
 155 };