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 ntohl(hdr
->pixmap_width
), ntohl(hdr
->pixmap_height
),
125 dec
->fmt_in
.video
.i_sar_num
,
126 dec
->fmt_in
.video
.i_sar_den
);
128 const size_t copy
= dec
->fmt_out
.video
.i_width
129 * (dec
->fmt_out
.video
.i_bits_per_pixel
/ 8);
130 const uint32_t pitch
= ntohl(hdr
->bytes_per_line
);
134 || (block
->i_buffer
/ pitch
) < dec
->fmt_out
.video
.i_height
)
137 pic
= decoder_NewPicture(dec
);
141 const uint8_t *in
= block
->p_buffer
;
142 uint8_t *out
= pic
->p
->p_pixels
;
143 for (unsigned i
= 0; i
< dec
->fmt_out
.video
.i_height
; i
++)
145 memcpy(out
, in
, copy
);
147 out
+= pic
->p
->i_pitch
;
149 pic
->date
= block
->i_pts
;
150 pic
->b_progressive
= true;
153 block_Release(block
);