FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
qdrw.c
Go to the documentation of this file.
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 static int decode_frame(AVCodecContext *avctx,
33  void *data, int *got_frame,
34  AVPacket *avpkt)
35 {
36  const uint8_t *buf = avpkt->data;
37  const uint8_t *buf_end = avpkt->data + avpkt->size;
38  int buf_size = avpkt->size;
39  AVFrame * const p = data;
40  uint8_t* outdata;
41  int colors;
42  int i, ret;
43  uint32_t *pal;
44  int r, g, b;
45 
46  if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
47  return ret;
49  p->key_frame = 1;
50 
51  outdata = p->data[0];
52 
53  if (buf_end - buf < 0x68 + 4)
54  return AVERROR_INVALIDDATA;
55  buf += 0x68; /* jump to palette */
56  colors = AV_RB32(buf);
57  buf += 4;
58 
59  if (colors < 0 || colors > 256) {
60  av_log(avctx, AV_LOG_ERROR, "Error color count - %i(0x%X)\n", colors, colors);
61  return AVERROR_INVALIDDATA;
62  }
63  if (buf_end - buf < (colors + 1) * 8)
64  return AVERROR_INVALIDDATA;
65 
66  pal = (uint32_t*)p->data[1];
67  for (i = 0; i <= colors; i++) {
68  unsigned int idx;
69  idx = AV_RB16(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  r = *buf++;
78  buf++;
79  g = *buf++;
80  buf++;
81  b = *buf++;
82  buf++;
83  pal[idx] = 0xFFU << 24 | r << 16 | g << 8 | b;
84  }
85  p->palette_has_changed = 1;
86 
87  if (buf_end - buf < 18)
88  return AVERROR_INVALIDDATA;
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  if (buf_end - buf < size)
101  return AVERROR_INVALIDDATA;
102 
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 + p->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 + p->linesize[0]))
117  break;
118  if (buf_end - buf < code + 1)
119  return AVERROR_INVALIDDATA;
120  memcpy(out, buf, code + 1);
121  out += code + 1;
122  buf += code + 1;
123  left -= 2 + code;
124  tsize += code + 1;
125  }
126  }
127  buf = next;
128  outdata += p->linesize[0];
129  }
130 
131  *got_frame = 1;
132 
133  return buf_size;
134 }
135 
137 {
138  avctx->pix_fmt= AV_PIX_FMT_PAL8;
139 
140  return 0;
141 }
142 
144  .name = "qdraw",
145  .type = AVMEDIA_TYPE_VIDEO,
146  .id = AV_CODEC_ID_QDRAW,
147  .init = decode_init,
148  .decode = decode_frame,
149  .capabilities = CODEC_CAP_DR1,
150  .long_name = NULL_IF_CONFIG_SMALL("Apple QuickDraw"),
151 };