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FFmpeg/libavcodec/xwddec.c
Paul B Mahol 27ed027bcd XWD encoder and decoder 
Signed-off-by: Kostya Shishkov <kostya.shishkov@gmail.com>
2012-01-23 19:04:35 +01:00

268 lines
8.8 KiB
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/*
* XWD image format
*
* Copyright (c) 2012 Paul B Mahol
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "bytestream.h"
#include "xwd.h"
static av_cold int xwd_decode_init(AVCodecContext *avctx)
{
avctx->coded_frame = avcodec_alloc_frame();
if (!avctx->coded_frame)
return AVERROR(ENOMEM);
return 0;
}
static int xwd_decode_frame(AVCodecContext *avctx, void *data,
int *data_size, AVPacket *avpkt)
{
AVFrame *p = avctx->coded_frame;
const uint8_t *buf = avpkt->data;
int i, ret, buf_size = avpkt->size;
uint32_t version, header_size, vclass, ncolors;
uint32_t xoffset, be, bpp, lsize, rsize;
uint32_t pixformat, pixdepth, bunit, bitorder, bpad;
uint32_t rgb[3];
uint8_t *ptr;
if (buf_size < XWD_HEADER_SIZE)
return AVERROR_INVALIDDATA;
header_size = bytestream_get_be32(&buf);
if (buf_size < header_size)
return AVERROR_INVALIDDATA;
version = bytestream_get_be32(&buf);
if (version != XWD_VERSION) {
av_log(avctx, AV_LOG_ERROR, "unsupported version\n");
return AVERROR_INVALIDDATA;
}
if (header_size < XWD_HEADER_SIZE) {
av_log(avctx, AV_LOG_ERROR, "invalid header size\n");
return AVERROR_INVALIDDATA;
}
pixformat = bytestream_get_be32(&buf);
pixdepth = bytestream_get_be32(&buf);
avctx->width = bytestream_get_be32(&buf);
avctx->height = bytestream_get_be32(&buf);
xoffset = bytestream_get_be32(&buf);
be = bytestream_get_be32(&buf);
bunit = bytestream_get_be32(&buf);
bitorder = bytestream_get_be32(&buf);
bpad = bytestream_get_be32(&buf);
bpp = bytestream_get_be32(&buf);
lsize = bytestream_get_be32(&buf);
vclass = bytestream_get_be32(&buf);
rgb[0] = bytestream_get_be32(&buf);
rgb[1] = bytestream_get_be32(&buf);
rgb[2] = bytestream_get_be32(&buf);
buf += 8;
ncolors = bytestream_get_be32(&buf);
buf += header_size - (XWD_HEADER_SIZE - 20);
av_log(avctx, AV_LOG_DEBUG, "pixformat %d, pixdepth %d, bunit %d, bitorder %d, bpad %d\n",
pixformat, pixdepth, bunit, bitorder, bpad);
av_log(avctx, AV_LOG_DEBUG, "vclass %d, ncolors %d, bpp %d, be %d, lsize %d, xoffset %d\n",
vclass, ncolors, bpp, be, lsize, xoffset);
av_log(avctx, AV_LOG_DEBUG, "red %0x, green %0x, blue %0x\n", rgb[0], rgb[1], rgb[2]);
if (pixformat > XWD_Z_PIXMAP) {
av_log(avctx, AV_LOG_ERROR, "invalid pixmap format\n");
return AVERROR_INVALIDDATA;
}
if (pixdepth == 0 || pixdepth > 32) {
av_log(avctx, AV_LOG_ERROR, "invalid pixmap depth\n");
return AVERROR_INVALIDDATA;
}
if (xoffset) {
av_log_ask_for_sample(avctx, "unsupported xoffset %d\n", xoffset);
return AVERROR_PATCHWELCOME;
}
if (be > 1) {
av_log(avctx, AV_LOG_ERROR, "invalid byte order\n");
return AVERROR_INVALIDDATA;
}
if (bitorder > 1) {
av_log(avctx, AV_LOG_ERROR, "invalid bitmap bit order\n");
return AVERROR_INVALIDDATA;
}
if (bunit != 8 && bunit != 16 && bunit != 32) {
av_log(avctx, AV_LOG_ERROR, "invalid bitmap unit\n");
return AVERROR_INVALIDDATA;
}
if (bpad != 8 && bpad != 16 && bpad != 32) {
av_log(avctx, AV_LOG_ERROR, "invalid bitmap scan-line pad\n");
return AVERROR_INVALIDDATA;
}
if (bpp == 0 || bpp > 32) {
av_log(avctx, AV_LOG_ERROR, "invalid bits per pixel\n");
return AVERROR_INVALIDDATA;
}
if (ncolors > 256) {
av_log(avctx, AV_LOG_ERROR, "invalid number of entries in colormap\n");
return AVERROR_INVALIDDATA;
}
if ((ret = av_image_check_size(avctx->width, avctx->height, 0, NULL)) < 0)
return ret;
rsize = FFALIGN(avctx->width * bpp, bpad) / 8;
if (lsize < rsize) {
av_log(avctx, AV_LOG_ERROR, "invalid bytes per scan-line\n");
return AVERROR_INVALIDDATA;
}
if (buf_size < header_size + ncolors * XWD_CMAP_SIZE + avctx->height * lsize) {
av_log(avctx, AV_LOG_ERROR, "input buffer too small\n");
return AVERROR_INVALIDDATA;
}
if (pixformat != XWD_Z_PIXMAP) {
av_log(avctx, AV_LOG_ERROR, "pixmap format %d unsupported\n", pixformat);
return AVERROR_PATCHWELCOME;
}
avctx->pix_fmt = PIX_FMT_NONE;
switch (vclass) {
case XWD_STATIC_GRAY:
case XWD_GRAY_SCALE:
if (bpp != 1)
return AVERROR_INVALIDDATA;
if (pixdepth == 1)
avctx->pix_fmt = PIX_FMT_MONOWHITE;
break;
case XWD_STATIC_COLOR:
case XWD_PSEUDO_COLOR:
if (bpp == 8)
avctx->pix_fmt = PIX_FMT_PAL8;
break;
case XWD_TRUE_COLOR:
case XWD_DIRECT_COLOR:
if (bpp != 16 && bpp != 24 && bpp != 32)
return AVERROR_INVALIDDATA;
if (bpp == 16 && pixdepth == 15) {
if (rgb[0] == 0x7C00 && rgb[1] == 0x3E0 && rgb[2] == 0x1F)
avctx->pix_fmt = be ? PIX_FMT_RGB555BE : PIX_FMT_RGB555LE;
else if (rgb[0] == 0x1F && rgb[1] == 0x3E0 && rgb[2] == 0x7C00)
avctx->pix_fmt = be ? PIX_FMT_BGR555BE : PIX_FMT_BGR555LE;
} else if (bpp == 16 && pixdepth == 16) {
if (rgb[0] == 0xF800 && rgb[1] == 0x7E0 && rgb[2] == 0x1F)
avctx->pix_fmt = be ? PIX_FMT_RGB565BE : PIX_FMT_RGB565LE;
else if (rgb[0] == 0x1F && rgb[1] == 0x7E0 && rgb[2] == 0xF800)
avctx->pix_fmt = be ? PIX_FMT_BGR565BE : PIX_FMT_BGR565LE;
} else if (bpp == 24) {
if (rgb[0] == 0xFF0000 && rgb[1] == 0xFF00 && rgb[2] == 0xFF)
avctx->pix_fmt = be ? PIX_FMT_RGB24 : PIX_FMT_BGR24;
else if (rgb[0] == 0xFF && rgb[1] == 0xFF00 && rgb[2] == 0xFF0000)
avctx->pix_fmt = be ? PIX_FMT_BGR24 : PIX_FMT_RGB24;
} else if (bpp == 32) {
if (rgb[0] == 0xFF0000 && rgb[1] == 0xFF00 && rgb[2] == 0xFF)
avctx->pix_fmt = be ? PIX_FMT_ARGB : PIX_FMT_BGRA;
else if (rgb[0] == 0xFF && rgb[1] == 0xFF00 && rgb[2] == 0xFF0000)
avctx->pix_fmt = be ? PIX_FMT_ABGR : PIX_FMT_RGBA;
}
buf += ncolors * XWD_CMAP_SIZE;
break;
default:
av_log(avctx, AV_LOG_ERROR, "invalid visual class\n");
return AVERROR_INVALIDDATA;
}
if (avctx->pix_fmt == PIX_FMT_NONE) {
av_log_ask_for_sample(avctx, "unknown file: bpp %d, pixdepth %d, vclass %d\n", bpp, pixdepth, vclass);
return AVERROR_PATCHWELCOME;
}
if (p->data[0])
avctx->release_buffer(avctx, p);
p->reference = 0;
if ((ret = avctx->get_buffer(avctx, p)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return ret;
}
p->key_frame = 1;
p->pict_type = AV_PICTURE_TYPE_I;
if (avctx->pix_fmt == PIX_FMT_PAL8) {
uint32_t *dst = (uint32_t *)p->data[1];
uint8_t red, green, blue;
for (i = 0; i < ncolors; i++) {
buf += 4; // skip colormap entry number
red = *buf; buf += 2;
green = *buf; buf += 2;
blue = *buf; buf += 2;
buf += 2; // skip bitmask flag and padding
dst[i] = red << 16 | green << 8 | blue;
}
}
ptr = p->data[0];
for (i = 0; i < avctx->height; i++) {
bytestream_get_buffer(&buf, ptr, rsize);
buf += lsize - rsize;
ptr += p->linesize[0];
}
*data_size = sizeof(AVFrame);
*(AVFrame *)data = *p;
return buf_size;
}
static av_cold int xwd_decode_close(AVCodecContext *avctx)
{
if (avctx->coded_frame->data[0])
avctx->release_buffer(avctx, avctx->coded_frame);
av_freep(&avctx->coded_frame);
return 0;
}
AVCodec ff_xwd_decoder = {
.name = "xwd",
.type = AVMEDIA_TYPE_VIDEO,
.id = CODEC_ID_XWD,
.init = xwd_decode_init,
.close = xwd_decode_close,
.decode = xwd_decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("XWD (X Window Dump) image"),
};
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