qdrw.c
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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 
27 #include "libavutil/intreadwrite.h"
28 #include "avcodec.h"
29 
30 typedef struct QdrawContext{
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  const uint8_t *buf_end = avpkt->data + avpkt->size;
41  int buf_size = avpkt->size;
42  QdrawContext * const a = avctx->priv_data;
43  AVFrame * const p= (AVFrame*)&a->pic;
44  uint8_t* outdata;
45  int colors;
46  int i;
47  uint32_t *pal;
48  int r, g, b;
49 
50  if(p->data[0])
51  avctx->release_buffer(avctx, p);
52 
53  p->reference= 0;
54  if(avctx->get_buffer(avctx, p) < 0){
55  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
56  return -1;
57  }
59  p->key_frame= 1;
60 
61  outdata = a->pic.data[0];
62 
63  if (buf_end - buf < 0x68 + 4)
64  return AVERROR_INVALIDDATA;
65  buf += 0x68; /* jump to palette */
66  colors = AV_RB32(buf);
67  buf += 4;
68 
69  if(colors < 0 || colors > 256) {
70  av_log(avctx, AV_LOG_ERROR, "Error color count - %i(0x%X)\n", colors, colors);
71  return -1;
72  }
73  if (buf_end - buf < (colors + 1) * 8)
74  return AVERROR_INVALIDDATA;
75 
76  pal = (uint32_t*)p->data[1];
77  for (i = 0; i <= colors; i++) {
78  unsigned int idx;
79  idx = AV_RB16(buf); /* color index */
80  buf += 2;
81 
82  if (idx > 255) {
83  av_log(avctx, AV_LOG_ERROR, "Palette index out of range: %u\n", idx);
84  buf += 6;
85  continue;
86  }
87  r = *buf++;
88  buf++;
89  g = *buf++;
90  buf++;
91  b = *buf++;
92  buf++;
93  pal[idx] = (r << 16) | (g << 8) | b;
94  }
95  p->palette_has_changed = 1;
96 
97  if (buf_end - buf < 18)
98  return AVERROR_INVALIDDATA;
99  buf += 18; /* skip unneeded data */
100  for (i = 0; i < avctx->height; i++) {
101  int size, left, code, pix;
102  const uint8_t *next;
103  uint8_t *out;
104  int tsize = 0;
105 
106  /* decode line */
107  out = outdata;
108  size = AV_RB16(buf); /* size of packed line */
109  buf += 2;
110  if (buf_end - buf < size)
111  return AVERROR_INVALIDDATA;
112 
113  left = size;
114  next = buf + size;
115  while (left > 0) {
116  code = *buf++;
117  if (code & 0x80 ) { /* run */
118  pix = *buf++;
119  if ((out + (257 - code)) > (outdata + a->pic.linesize[0]))
120  break;
121  memset(out, pix, 257 - code);
122  out += 257 - code;
123  tsize += 257 - code;
124  left -= 2;
125  } else { /* copy */
126  if ((out + code) > (outdata + a->pic.linesize[0]))
127  break;
128  if (buf_end - buf < code + 1)
129  return AVERROR_INVALIDDATA;
130  memcpy(out, buf, code + 1);
131  out += code + 1;
132  buf += code + 1;
133  left -= 2 + code;
134  tsize += code + 1;
135  }
136  }
137  buf = next;
138  outdata += a->pic.linesize[0];
139  }
140 
141  *data_size = sizeof(AVFrame);
142  *(AVFrame*)data = a->pic;
143 
144  return buf_size;
145 }
146 
147 static av_cold int decode_init(AVCodecContext *avctx){
148 // QdrawContext * const a = avctx->priv_data;
149 
150  avctx->pix_fmt= PIX_FMT_PAL8;
151 
152  return 0;
153 }
154 
155 static av_cold int decode_end(AVCodecContext *avctx){
156  QdrawContext * const a = avctx->priv_data;
157  AVFrame *pic = &a->pic;
158 
159  if (pic->data[0])
160  avctx->release_buffer(avctx, pic);
161 
162  return 0;
163 }
164 
166  .name = "qdraw",
167  .type = AVMEDIA_TYPE_VIDEO,
168  .id = CODEC_ID_QDRAW,
169  .priv_data_size = sizeof(QdrawContext),
170  .init = decode_init,
171  .close = decode_end,
172  .decode = decode_frame,
173  .capabilities = CODEC_CAP_DR1,
174  .long_name = NULL_IF_CONFIG_SMALL("Apple QuickDraw"),
175 };