4 * Copyright (c) 2012 Paul B Mahol
6 * This file is part of Libav.
8 * Libav 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.
13 * Libav 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.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/pixdesc.h"
26 #include "bytestream.h"
29 #define WINDOW_NAME "lavcxwdenc"
30 #define WINDOW_NAME_SIZE 11
32 static av_cold int xwd_encode_init(AVCodecContext *avctx)
34 avctx->coded_frame = avcodec_alloc_frame();
35 if (!avctx->coded_frame)
36 return AVERROR(ENOMEM);
41 static int xwd_encode_frame(AVCodecContext *avctx, uint8_t *buf,
42 int buf_size, void *data)
45 enum PixelFormat pix_fmt = avctx->pix_fmt;
46 uint32_t pixdepth, bpp, bpad, ncolors = 0, lsize, vclass, be = 0;
47 uint32_t rgb[3] = { 0 };
52 pixdepth = av_get_bits_per_pixel(&av_pix_fmt_descriptors[pix_fmt]);
53 if (av_pix_fmt_descriptors[pix_fmt].flags & PIX_FMT_BE)
60 if (pix_fmt == PIX_FMT_ARGB ||
61 pix_fmt == PIX_FMT_ABGR)
63 if (pix_fmt == PIX_FMT_ABGR ||
64 pix_fmt == PIX_FMT_RGBA) {
75 vclass = XWD_TRUE_COLOR;
80 if (pix_fmt == PIX_FMT_RGB24)
83 vclass = XWD_TRUE_COLOR;
89 case PIX_FMT_RGB565LE:
90 case PIX_FMT_RGB565BE:
91 case PIX_FMT_BGR565LE:
92 case PIX_FMT_BGR565BE:
93 if (pix_fmt == PIX_FMT_BGR565LE ||
94 pix_fmt == PIX_FMT_BGR565BE) {
104 vclass = XWD_TRUE_COLOR;
107 case PIX_FMT_RGB555LE:
108 case PIX_FMT_RGB555BE:
109 case PIX_FMT_BGR555LE:
110 case PIX_FMT_BGR555BE:
111 if (pix_fmt == PIX_FMT_BGR555LE ||
112 pix_fmt == PIX_FMT_BGR555BE) {
122 vclass = XWD_TRUE_COLOR;
127 case PIX_FMT_RGB4_BYTE:
128 case PIX_FMT_BGR4_BYTE:
131 vclass = XWD_PSEUDO_COLOR;
135 case PIX_FMT_MONOWHITE:
138 vclass = XWD_STATIC_GRAY;
141 av_log(avctx, AV_LOG_INFO, "unsupported pixel format\n");
142 return AVERROR(EINVAL);
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;
149 if (buf_size < out_size) {
150 av_log(avctx, AV_LOG_ERROR, "output buffer too small\n");
151 return AVERROR(ENOMEM);
154 avctx->coded_frame->key_frame = 1;
155 avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
157 bytestream_put_be32(&buf, header_size);
158 bytestream_put_be32(&buf, XWD_VERSION); // file version
159 bytestream_put_be32(&buf, XWD_Z_PIXMAP); // pixmap format
160 bytestream_put_be32(&buf, pixdepth); // pixmap depth in pixels
161 bytestream_put_be32(&buf, avctx->width); // pixmap width in pixels
162 bytestream_put_be32(&buf, avctx->height); // pixmap height in pixels
163 bytestream_put_be32(&buf, 0); // bitmap x offset
164 bytestream_put_be32(&buf, be); // byte order
165 bytestream_put_be32(&buf, 32); // bitmap unit
166 bytestream_put_be32(&buf, be); // bit-order of image data
167 bytestream_put_be32(&buf, bpad); // bitmap scan-line pad in bits
168 bytestream_put_be32(&buf, bpp); // bits per pixel
169 bytestream_put_be32(&buf, lsize); // bytes per scan-line
170 bytestream_put_be32(&buf, vclass); // visual class
171 bytestream_put_be32(&buf, rgb[0]); // red mask
172 bytestream_put_be32(&buf, rgb[1]); // green mask
173 bytestream_put_be32(&buf, rgb[2]); // blue mask
174 bytestream_put_be32(&buf, 8); // size of each bitmask in bits
175 bytestream_put_be32(&buf, ncolors); // number of colors
176 bytestream_put_be32(&buf, ncolors); // number of entries in color map
177 bytestream_put_be32(&buf, avctx->width); // window width
178 bytestream_put_be32(&buf, avctx->height); // window height
179 bytestream_put_be32(&buf, 0); // window upper left X coordinate
180 bytestream_put_be32(&buf, 0); // window upper left Y coordinate
181 bytestream_put_be32(&buf, 0); // window border width
182 bytestream_put_buffer(&buf, WINDOW_NAME, WINDOW_NAME_SIZE);
184 for (i = 0; i < ncolors; i++) {
186 uint8_t red, green, blue;
188 val = AV_RN32A(p->data[1] + i * 4);
189 red = (val >> 16) & 0xFF;
190 green = (val >> 8) & 0xFF;
193 bytestream_put_be32(&buf, i); // colormap entry number
194 bytestream_put_be16(&buf, red << 8);
195 bytestream_put_be16(&buf, green << 8);
196 bytestream_put_be16(&buf, blue << 8);
197 bytestream_put_byte(&buf, 0x7); // bitmask flag
198 bytestream_put_byte(&buf, 0); // padding
202 for (i = 0; i < avctx->height; i++) {
203 bytestream_put_buffer(&buf, ptr, lsize);
204 ptr += p->linesize[0];
210 static av_cold int xwd_encode_close(AVCodecContext *avctx)
212 av_freep(&avctx->coded_frame);
217 AVCodec ff_xwd_encoder = {
219 .type = AVMEDIA_TYPE_VIDEO,
221 .init = xwd_encode_init,
222 .encode = xwd_encode_frame,
223 .close = xwd_encode_close,
224 .pix_fmts = (const enum PixelFormat[]) { PIX_FMT_BGRA,
245 .long_name = NULL_IF_CONFIG_SMALL("XWD (X Window Dump) image"),