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xwdenc.c
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1 /*
2  * XWD image format
3  *
4  * Copyright (c) 2012 Paul B Mahol
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/pixdesc.h"
25 #include "avcodec.h"
26 #include "bytestream.h"
27 #include "internal.h"
28 #include "xwd.h"
29 
30 #define WINDOW_NAME "lavcxwdenc"
31 #define WINDOW_NAME_SIZE 11
32 
33 static int xwd_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
34  const AVFrame *pict, int *got_packet)
35 {
36  enum AVPixelFormat pix_fmt = avctx->pix_fmt;
37  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
38  uint32_t pixdepth, bpp, bpad, ncolors = 0, lsize, vclass, be = 0;
39  uint32_t rgb[3] = { 0 }, bitorder = 0;
40  uint32_t header_size;
41  int i, out_size, ret;
42  uint8_t *ptr, *buf;
43  AVFrame * const p = (AVFrame *)pict;
44 
45  pixdepth = av_get_bits_per_pixel(desc);
46  if (desc->flags & AV_PIX_FMT_FLAG_BE)
47  be = 1;
48  switch (pix_fmt) {
49  case AV_PIX_FMT_ARGB:
50  case AV_PIX_FMT_BGRA:
51  case AV_PIX_FMT_RGBA:
52  case AV_PIX_FMT_ABGR:
53  if (pix_fmt == AV_PIX_FMT_ARGB ||
54  pix_fmt == AV_PIX_FMT_ABGR)
55  be = 1;
56  if (pix_fmt == AV_PIX_FMT_ABGR ||
57  pix_fmt == AV_PIX_FMT_RGBA) {
58  rgb[0] = 0xFF;
59  rgb[1] = 0xFF00;
60  rgb[2] = 0xFF0000;
61  } else {
62  rgb[0] = 0xFF0000;
63  rgb[1] = 0xFF00;
64  rgb[2] = 0xFF;
65  }
66  bpp = 32;
67  pixdepth = 24;
68  vclass = XWD_TRUE_COLOR;
69  bpad = 32;
70  break;
71  case AV_PIX_FMT_BGR24:
72  case AV_PIX_FMT_RGB24:
73  if (pix_fmt == AV_PIX_FMT_RGB24)
74  be = 1;
75  bpp = 24;
76  vclass = XWD_TRUE_COLOR;
77  bpad = 32;
78  rgb[0] = 0xFF0000;
79  rgb[1] = 0xFF00;
80  rgb[2] = 0xFF;
81  break;
82  case AV_PIX_FMT_RGB565LE:
83  case AV_PIX_FMT_RGB565BE:
84  case AV_PIX_FMT_BGR565LE:
85  case AV_PIX_FMT_BGR565BE:
86  if (pix_fmt == AV_PIX_FMT_BGR565LE ||
87  pix_fmt == AV_PIX_FMT_BGR565BE) {
88  rgb[0] = 0x1F;
89  rgb[1] = 0x7E0;
90  rgb[2] = 0xF800;
91  } else {
92  rgb[0] = 0xF800;
93  rgb[1] = 0x7E0;
94  rgb[2] = 0x1F;
95  }
96  bpp = 16;
97  vclass = XWD_TRUE_COLOR;
98  bpad = 16;
99  break;
100  case AV_PIX_FMT_RGB555LE:
101  case AV_PIX_FMT_RGB555BE:
102  case AV_PIX_FMT_BGR555LE:
103  case AV_PIX_FMT_BGR555BE:
104  if (pix_fmt == AV_PIX_FMT_BGR555LE ||
105  pix_fmt == AV_PIX_FMT_BGR555BE) {
106  rgb[0] = 0x1F;
107  rgb[1] = 0x3E0;
108  rgb[2] = 0x7C00;
109  } else {
110  rgb[0] = 0x7C00;
111  rgb[1] = 0x3E0;
112  rgb[2] = 0x1F;
113  }
114  bpp = 16;
115  vclass = XWD_TRUE_COLOR;
116  bpad = 16;
117  break;
118  case AV_PIX_FMT_RGB8:
119  case AV_PIX_FMT_BGR8:
120  case AV_PIX_FMT_RGB4_BYTE:
121  case AV_PIX_FMT_BGR4_BYTE:
122  case AV_PIX_FMT_PAL8:
123  bpp = 8;
124  vclass = XWD_PSEUDO_COLOR;
125  bpad = 8;
126  ncolors = 256;
127  break;
128  case AV_PIX_FMT_GRAY8:
129  bpp = 8;
130  bpad = 8;
131  vclass = XWD_STATIC_GRAY;
132  break;
133  case AV_PIX_FMT_MONOWHITE:
134  be = 1;
135  bitorder = 1;
136  bpp = 1;
137  bpad = 8;
138  vclass = XWD_STATIC_GRAY;
139  break;
140  default:
141  av_log(avctx, AV_LOG_ERROR, "unsupported pixel format\n");
142  return AVERROR(EINVAL);
143  }
144 
145  lsize = FFALIGN(bpp * avctx->width, bpad) / 8;
146  header_size = XWD_HEADER_SIZE + WINDOW_NAME_SIZE;
147  out_size = header_size + ncolors * XWD_CMAP_SIZE + avctx->height * lsize;
148 
149  if ((ret = ff_alloc_packet2(avctx, pkt, out_size)) < 0)
150  return ret;
151  buf = pkt->data;
152 
153  p->key_frame = 1;
154  p->pict_type = AV_PICTURE_TYPE_I;
155 
156  bytestream_put_be32(&buf, header_size);
157  bytestream_put_be32(&buf, XWD_VERSION); // file version
158  bytestream_put_be32(&buf, XWD_Z_PIXMAP); // pixmap format
159  bytestream_put_be32(&buf, pixdepth); // pixmap depth in pixels
160  bytestream_put_be32(&buf, avctx->width); // pixmap width in pixels
161  bytestream_put_be32(&buf, avctx->height); // pixmap height in pixels
162  bytestream_put_be32(&buf, 0); // bitmap x offset
163  bytestream_put_be32(&buf, be); // byte order
164  bytestream_put_be32(&buf, 32); // bitmap unit
165  bytestream_put_be32(&buf, bitorder); // bit-order of image data
166  bytestream_put_be32(&buf, bpad); // bitmap scan-line pad in bits
167  bytestream_put_be32(&buf, bpp); // bits per pixel
168  bytestream_put_be32(&buf, lsize); // bytes per scan-line
169  bytestream_put_be32(&buf, vclass); // visual class
170  bytestream_put_be32(&buf, rgb[0]); // red mask
171  bytestream_put_be32(&buf, rgb[1]); // green mask
172  bytestream_put_be32(&buf, rgb[2]); // blue mask
173  bytestream_put_be32(&buf, 8); // size of each bitmask in bits
174  bytestream_put_be32(&buf, ncolors); // number of colors
175  bytestream_put_be32(&buf, ncolors); // number of entries in color map
176  bytestream_put_be32(&buf, avctx->width); // window width
177  bytestream_put_be32(&buf, avctx->height); // window height
178  bytestream_put_be32(&buf, 0); // window upper left X coordinate
179  bytestream_put_be32(&buf, 0); // window upper left Y coordinate
180  bytestream_put_be32(&buf, 0); // window border width
181  bytestream_put_buffer(&buf, WINDOW_NAME, WINDOW_NAME_SIZE);
182 
183  for (i = 0; i < ncolors; i++) {
184  uint32_t val;
185  uint8_t red, green, blue;
186 
187  val = AV_RN32A(p->data[1] + i * 4);
188  red = (val >> 16) & 0xFF;
189  green = (val >> 8) & 0xFF;
190  blue = val & 0xFF;
191 
192  bytestream_put_be32(&buf, i); // colormap entry number
193  bytestream_put_be16(&buf, red << 8);
194  bytestream_put_be16(&buf, green << 8);
195  bytestream_put_be16(&buf, blue << 8);
196  bytestream_put_byte(&buf, 0x7); // bitmask flag
197  bytestream_put_byte(&buf, 0); // padding
198  }
199 
200  ptr = p->data[0];
201  for (i = 0; i < avctx->height; i++) {
202  bytestream_put_buffer(&buf, ptr, lsize);
203  ptr += p->linesize[0];
204  }
205 
206  pkt->flags |= AV_PKT_FLAG_KEY;
207  *got_packet = 1;
208  return 0;
209 }
210 
211 AVCodec ff_xwd_encoder = {
212  .name = "xwd",
213  .long_name = NULL_IF_CONFIG_SMALL("XWD (X Window Dump) image"),
214  .type = AVMEDIA_TYPE_VIDEO,
215  .id = AV_CODEC_ID_XWD,
216  .encode2 = xwd_encode_frame,
217  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_BGRA,
218  AV_PIX_FMT_RGBA,
219  AV_PIX_FMT_ARGB,
220  AV_PIX_FMT_ABGR,
221  AV_PIX_FMT_RGB24,
222  AV_PIX_FMT_BGR24,
223  AV_PIX_FMT_RGB565BE,
224  AV_PIX_FMT_RGB565LE,
225  AV_PIX_FMT_BGR565BE,
226  AV_PIX_FMT_BGR565LE,
227  AV_PIX_FMT_RGB555BE,
228  AV_PIX_FMT_RGB555LE,
229  AV_PIX_FMT_BGR555BE,
230  AV_PIX_FMT_BGR555LE,
231  AV_PIX_FMT_RGB8,
232  AV_PIX_FMT_BGR8,
233  AV_PIX_FMT_RGB4_BYTE,
234  AV_PIX_FMT_BGR4_BYTE,
235  AV_PIX_FMT_PAL8,
236  AV_PIX_FMT_GRAY8,
237  AV_PIX_FMT_MONOWHITE,
238  AV_PIX_FMT_NONE },
239 };
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