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/*****************************************************************************
* xwd.c: X Window system raster image dump pseudo-decoder
*****************************************************************************
* Copyright (C) 2012 Rémi Denis-Courmont
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <assert.h>
#include <arpa/inet.h>
#include <X11/XWDFile.h>
#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_codec.h>
static int Open(vlc_object_t *);
vlc_module_begin()
set_description(N_("XWD image decoder"))
set_capability("video decoder", 50)
set_category(CAT_INPUT)
set_subcategory(SUBCAT_INPUT_VCODEC)
set_callbacks(Open, NULL)
vlc_module_end()
static int Decode(decoder_t *, block_t *);
static int Open(vlc_object_t *obj)
{
decoder_t *dec = (decoder_t *)obj;
if (dec->fmt_in.i_codec != VLC_CODEC_XWD)
return VLC_EGENERIC;
dec->pf_decode = Decode;
es_format_Copy(&dec->fmt_out, &dec->fmt_in);
dec->fmt_out.i_codec = VLC_CODEC_RGB32;
return VLC_SUCCESS;
}
static int Decode (decoder_t *dec, block_t *block)
{
picture_t *pic = NULL;
if (block == NULL) /* No Drain */
return VLCDEC_SUCCESS;
if (block->i_pts <= VLC_TICK_INVALID)
goto drop; /* undated block, should never happen */
if (block->i_buffer < sz_XWDheader)
goto drop;
/* Skip XWD header */
const XWDFileHeader *hdr = (const void *)block->p_buffer;
uint32_t hdrlen = ntohl(hdr->header_size);
if (hdrlen < sz_XWDheader
|| ntohl(hdr->file_version) < XWD_FILE_VERSION
|| ntohl(hdr->pixmap_format) != 2 /* ZPixmap */)
goto drop;
hdrlen += ntohl(hdr->ncolors) * sz_XWDColor;
if (hdrlen > block->i_buffer)
goto drop;
block->p_buffer += hdrlen;
block->i_buffer -= hdrlen;
/* Parse XWD header */
vlc_fourcc_t chroma = 0;
switch (ntohl(hdr->pixmap_depth))
{
case 8:
if (ntohl(hdr->bits_per_pixel) == 8)
chroma = VLC_CODEC_RGB8;
break;
case 15:
if (ntohl(hdr->bits_per_pixel) == 16)
chroma = VLC_CODEC_RGB15;
break;
case 16:
if (ntohl(hdr->bits_per_pixel) == 16)
chroma = VLC_CODEC_RGB16;
break;
case 24:
switch (ntohl(hdr->bits_per_pixel))
{
case 32: chroma = VLC_CODEC_RGB32; break;
case 24: chroma = VLC_CODEC_RGB24; break;
}
break;
case 32:
if (ntohl(hdr->bits_per_pixel) == 32)
chroma = VLC_CODEC_ARGB;
break;
}
/* TODO: check image endianness, set RGB mask */
if (!chroma)
goto drop;
video_format_Setup(&dec->fmt_out.video, chroma,
ntohl(hdr->pixmap_width), ntohl(hdr->pixmap_height),
ntohl(hdr->pixmap_width), ntohl(hdr->pixmap_height),
dec->fmt_in.video.i_sar_num,
dec->fmt_in.video.i_sar_den);
const size_t copy = dec->fmt_out.video.i_width
* (dec->fmt_out.video.i_bits_per_pixel / 8);
const uint32_t pitch = ntohl(hdr->bytes_per_line);
/* Build picture */
if (pitch < copy
|| (block->i_buffer / pitch) < dec->fmt_out.video.i_height)
goto drop;
if (decoder_UpdateVideoFormat(dec))
goto drop;
pic = decoder_NewPicture(dec);
if (pic == NULL)
goto drop;
const uint8_t *in = block->p_buffer;
uint8_t *out = pic->p->p_pixels;
for (unsigned i = 0; i < dec->fmt_out.video.i_height; i++)
{
memcpy(out, in, copy);
in += pitch;
out += pic->p->i_pitch;
}
pic->date = block->i_pts;
pic->b_progressive = true;
drop:
block_Release(block);
decoder_QueueVideo(dec, pic);
return VLCDEC_SUCCESS;
}
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