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 libavcodec/qdrw.c
  24  * Apple QuickDraw codec.
  25  */
  26
  27 #include "libavutil/intreadwrite.h"
  28 #include "avcodec.h"
  29
  30 typedef struct QdrawContext{
  31     AVCodecContext *avctx;
  32     AVFrame pic;
  33 } QdrawContext;
  34
  35 static int decode_frame(AVCodecContext *avctx,
  36                         void *data, int *data_size,
  37                         AVPacket *avpkt)
  38 {
  39     const uint8_t *buf = avpkt->data;
  40     int buf_size = avpkt->size;
  41     QdrawContext * const a = avctx->priv_data;
  42     AVFrame * const p= (AVFrame*)&a->pic;
  43     uint8_t* outdata;
  44     int colors;
  45     int i;
  46     uint32_t *pal;
  47     int r, g, b;
  48
  49     if(p->data[0])
  50         avctx->release_buffer(avctx, p);
  51
  52     p->reference= 0;
  53     if(avctx->get_buffer(avctx, p) < 0){
  54         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
  55         return -1;
  56     }
  57     p->pict_type= FF_I_TYPE;
  58     p->key_frame= 1;
  59
  60     outdata = a->pic.data[0];
  61
  62     buf += 0x68; /* jump to palette */
  63     colors = AV_RB32(buf);
  64     buf += 4;
  65
  66     if(colors < 0 || colors > 256) {
  67         av_log(avctx, AV_LOG_ERROR, "Error color count - %i(0x%X)\n", colors, colors);
  68         return -1;
  69     }
  70
  71     pal = (uint32_t*)p->data[1];
  72     for (i = 0; i <= colors; i++) {
  73         unsigned int idx;
  74         idx = AV_RB16(buf); /* color index */
  75         buf += 2;
  76
  77         if (idx > 255) {
  78             av_log(avctx, AV_LOG_ERROR, "Palette index out of range: %u\n", idx);
  79             buf += 6;
  80             continue;
  81         }
  82         r = *buf++;
  83         buf++;
  84         g = *buf++;
  85         buf++;
  86         b = *buf++;
  87         buf++;
  88         pal[idx] = (r << 16) | (g << 8) | b;
  89     }
  90     p->palette_has_changed = 1;
  91
  92     buf += 18; /* skip unneeded data */
  93     for (i = 0; i < avctx->height; i++) {
  94         int size, left, code, pix;
  95         const uint8_t *next;
  96         uint8_t *out;
  97         int tsize = 0;
  98
  99         /* decode line */
 100         out = outdata;
 101         size = AV_RB16(buf); /* size of packed line */
 102         buf += 2;
 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 +  a->pic.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 +  a->pic.linesize[0]))
 117                     break;
 118                 memcpy(out, buf, code + 1);
 119                 out += code + 1;
 120                 buf += code + 1;
 121                 left -= 2 + code;
 122                 tsize += code + 1;
 123             }
 124         }
 125         buf = next;
 126         outdata += a->pic.linesize[0];
 127     }
 128
 129     *data_size = sizeof(AVFrame);
 130     *(AVFrame*)data = a->pic;
 131
 132     return buf_size;
 133 }
 134
 135 static av_cold int decode_init(AVCodecContext *avctx){
 136 //    QdrawContext * const a = avctx->priv_data;
 137
 138     if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
 139         return 1;
 140     }
 141
 142     avctx->pix_fmt= PIX_FMT_PAL8;
 143
 144     return 0;
 145 }
 146
 147 AVCodec qdraw_decoder = {
 148     "qdraw",
 149     CODEC_TYPE_VIDEO,
 150     CODEC_ID_QDRAW,
 151     sizeof(QdrawContext),
 152     decode_init,
 153     NULL,
 154     NULL,
 155     decode_frame,
 156     CODEC_CAP_DR1,
 157     .long_name = NULL_IF_CONFIG_SMALL("Apple QuickDraw"),
 158 };