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qdrw.c
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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
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{
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;
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(ff_get_buffer(avctx, p) < 0){
57  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
58  return -1;
59  }
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 -1;
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] = 0xFFU << 24 | 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  QdrawContext * const a = avctx->priv_data;
151 
153  avctx->pix_fmt= AV_PIX_FMT_PAL8;
154 
155  return 0;
156 }
157 
158 static av_cold int decode_end(AVCodecContext *avctx){
159  QdrawContext * const a = avctx->priv_data;
160  AVFrame *pic = &a->pic;
161 
162  if (pic->data[0])
163  avctx->release_buffer(avctx, pic);
164 
165  return 0;
166 }
167 
169  .name = "qdraw",
170  .type = AVMEDIA_TYPE_VIDEO,
171  .id = AV_CODEC_ID_QDRAW,
172  .priv_data_size = sizeof(QdrawContext),
173  .init = decode_init,
174  .close = decode_end,
175  .decode = decode_frame,
176  .capabilities = CODEC_CAP_DR1,
177  .long_name = NULL_IF_CONFIG_SMALL("Apple QuickDraw"),
178 };