quicktime/ffmpeg/libavcodec/qdrw.c

   1 /*
   2  * QuickDraw (qdrw) codec
   3  * Copyright (c) 2004 Konstantin Shishkov
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  *
  19  */
  20
  21 /**
  22  * @file qdrw.c
  23  * Apple QuickDraw codec.
  24  */
  25
  26 #include "avcodec.h"
  27 #include "mpegvideo.h"
  28
  29 typedef struct QdrawContext{
  30     AVCodecContext *avctx;
  31     AVFrame pic;
  32     uint8_t palette[256*3];
  33 } QdrawContext;
  34
  35 static int decode_frame(AVCodecContext *avctx,
  36                         void *data, int *data_size,
  37                         uint8_t *buf, int buf_size)
  38 {
  39     QdrawContext * const a = avctx->priv_data;
  40     AVFrame * const p= (AVFrame*)&a->pic;
  41     uint8_t* outdata;
  42     int colors;
  43     int i;
  44
  45     if(p->data[0])
  46         avctx->release_buffer(avctx, p);
  47
  48     p->reference= 0;
  49     if(avctx->get_buffer(avctx, p) < 0){
  50         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
  51         return -1;
  52     }
  53     p->pict_type= I_TYPE;
  54     p->key_frame= 1;
  55
  56     outdata = a->pic.data[0];
  57
  58     buf += 0x68; /* jump to palette */
  59     colors = BE_32(buf);
  60     buf += 4;
  61
  62     if(colors < 0 || colors > 256) {
  63         av_log(avctx, AV_LOG_ERROR, "Error color count - %i(0x%X)\n", colors, colors);
  64         return -1;
  65     }
  66
  67     for (i = 0; i <= colors; i++) {
  68         unsigned int idx;
  69         idx = BE_16(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         a->palette[idx * 3 + 0] = *buf++;
  78         buf++;
  79         a->palette[idx * 3 + 1] = *buf++;
  80         buf++;
  81         a->palette[idx * 3 + 2] = *buf++;
  82         buf++;
  83     }
  84
  85     buf += 18; /* skip unneeded data */
  86     for (i = 0; i < avctx->height; i++) {
  87         int size, left, code, pix;
  88         uint8_t *next;
  89         uint8_t *out;
  90         int tsize = 0;
  91
  92         /* decode line */
  93         out = outdata;
  94         size = BE_16(buf); /* size of packed line */
  95         buf += 2;
  96         left = size;
  97         next = buf + size;
  98         while (left > 0) {
  99             code = *buf++;
 100             if (code & 0x80 ) { /* run */
 101                 int i;
 102                 pix = *buf++;
 103                 if ((out + (257 - code) * 3) > (outdata +  a->pic.linesize[0]))
 104                     break;
 105                 for (i = 0; i < 257 - code; i++) {
 106                     *out++ = a->palette[pix * 3 + 0];
 107                     *out++ = a->palette[pix * 3 + 1];
 108                     *out++ = a->palette[pix * 3 + 2];
 109                 }
 110                 tsize += 257 - code;
 111                 left -= 2;
 112             } else { /* copy */
 113                 int i, pix;
 114                 if ((out + code * 3) > (outdata +  a->pic.linesize[0]))
 115                     break;
 116                 for (i = 0; i <= code; i++) {
 117                     pix = *buf++;
 118                     *out++ = a->palette[pix * 3 + 0];
 119                     *out++ = a->palette[pix * 3 + 1];
 120                     *out++ = a->palette[pix * 3 + 2];
 121                 }
 122                 left -= 2 + code;
 123                 tsize += code + 1;
 124             }
 125         }
 126         buf = next;
 127         outdata += a->pic.linesize[0];
 128     }
 129
 130     *data_size = sizeof(AVFrame);
 131     *(AVFrame*)data = a->pic;
 132
 133     return buf_size;
 134 }
 135
 136 static int decode_init(AVCodecContext *avctx){
 137 //    QdrawContext * const a = avctx->priv_data;
 138
 139     if (avcodec_check_dimensions(avctx, avctx->height, avctx->width) < 0) {
 140         return 1;
 141     }
 142
 143     avctx->pix_fmt= PIX_FMT_RGB24;
 144
 145     return 0;
 146 }
 147
 148 AVCodec qdraw_decoder = {
 149     "qdraw",
 150     CODEC_TYPE_VIDEO,
 151     CODEC_ID_QDRAW,
 152     sizeof(QdrawContext),
 153     decode_init,
 154     NULL,
 155     NULL,
 156     decode_frame,
 157     CODEC_CAP_DR1,
 158 };