1 /*****************************************************************************
2 * xwd.c: X Window system raster image dump pseudo-decoder
3 *****************************************************************************
4 * Copyright (C) 2012 RĂ©mi Denis-Courmont
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU Lesser General Public License as published by
8 * the Free Software Foundation; either version 2.1 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
19 *****************************************************************************/
26 #include <arpa/inet.h>
27 #include <X11/XWDFile.h>
29 #include <vlc_common.h>
30 #include <vlc_plugin.h>
31 #include <vlc_codec.h>
33 static int Open(vlc_object_t *);
36 set_description(N_("XWD image decoder"))
37 set_capability("decoder", 50)
38 set_category(CAT_INPUT)
39 set_subcategory(SUBCAT_INPUT_VCODEC)
40 set_callbacks(Open, NULL)
43 static picture_t *Decode(decoder_t *, block_t **);
45 static int Open(vlc_object_t *obj)
47 decoder_t *dec = (decoder_t *)obj;
49 if (dec->fmt_in.i_codec != VLC_CODEC_XWD)
52 dec->pf_decode_video = Decode;
53 es_format_Copy(&dec->fmt_out, &dec->fmt_in);
54 dec->fmt_out.i_codec = VLC_CODEC_RGB32;
55 dec->fmt_out.i_cat = VIDEO_ES;
59 static picture_t *Decode (decoder_t *dec, block_t **pp)
61 picture_t *pic = NULL;
71 if (block->i_pts <= VLC_TS_INVALID)
72 goto drop; /* undated block, should never happen */
73 if (block->i_buffer < sz_XWDheader)
77 const XWDFileHeader *hdr = (const void *)block->p_buffer;
78 uint32_t hdrlen = ntohl(hdr->header_size);
79 if (hdrlen < sz_XWDheader
80 || ntohl(hdr->file_version) < XWD_FILE_VERSION
81 || ntohl(hdr->pixmap_format) != 2 /* ZPixmap */)
84 hdrlen += ntohl(hdr->ncolors) * sz_XWDColor;
85 if (hdrlen > block->i_buffer)
87 block->p_buffer += hdrlen;
88 block->i_buffer -= hdrlen;
90 /* Parse XWD header */
91 vlc_fourcc_t chroma = 0;
92 switch (ntohl(hdr->pixmap_depth))
95 if (ntohl(hdr->bits_per_pixel) == 8)
96 chroma = VLC_CODEC_RGB8;
99 if (ntohl(hdr->bits_per_pixel) == 16)
100 chroma = VLC_CODEC_RGB15;
103 if (ntohl(hdr->bits_per_pixel) == 16)
104 chroma = VLC_CODEC_RGB16;
107 switch (ntohl(hdr->bits_per_pixel))
109 case 32: chroma = VLC_CODEC_RGB32; break;
110 case 24: chroma = VLC_CODEC_RGB24; break;
114 if (ntohl(hdr->bits_per_pixel) == 32)
115 chroma = VLC_CODEC_ARGB;
118 /* TODO: check image endianess, set RGB mask */
122 video_format_Setup(&dec->fmt_out.video, chroma,
123 ntohl(hdr->pixmap_width), ntohl(hdr->pixmap_height),
124 dec->fmt_in.video.i_sar_num,
125 dec->fmt_in.video.i_sar_den);
127 const size_t copy = dec->fmt_out.video.i_width
128 * (dec->fmt_out.video.i_bits_per_pixel / 8);
129 const uint32_t pitch = ntohl(hdr->bytes_per_line);
133 || (block->i_buffer / pitch) < dec->fmt_out.video.i_height)
136 pic = decoder_NewPicture(dec);
140 const uint8_t *in = block->p_buffer;
141 uint8_t *out = pic->p->p_pixels;
142 for (unsigned i = 0; i < dec->fmt_out.video.i_height; i++)
144 memcpy(out, in, copy);
146 out += pic->p->i_pitch;
148 pic->date = block->i_pts;
149 pic->b_progressive = true;
152 block_Release(block);