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FFmpeg/libavcodec/xwddec.c
Andreas Rheinhardt 4243da4ff4 avcodec/codec_internal: Use union for FFCodec decode/encode callbacks 
This is possible, because every given FFCodec has to implement
exactly one of these. Doing so decreases sizeof(FFCodec) and
therefore decreases the size of the binary.
Notice that in case of position-independent code the decrease
is in .data.rel.ro, so that this translates to decreased
memory consumption.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-04-05 20:02:37 +02:00

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/*
* XWD image format
*
* Copyright (c) 2012 Paul B Mahol
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <inttypes.h>
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "internal.h"
#include "xwd.h"
static int xwd_decode_frame(AVCodecContext *avctx, AVFrame *p,
int *got_frame, AVPacket *avpkt)
{
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;
int width, height;
GetByteContext gb;
if (buf_size < XWD_HEADER_SIZE)
return AVERROR_INVALIDDATA;
bytestream2_init(&gb, buf, buf_size);
header_size = bytestream2_get_be32u(&gb);
version = bytestream2_get_be32u(&gb);
if (version != XWD_VERSION) {
av_log(avctx, AV_LOG_ERROR, "unsupported version\n");
return AVERROR_INVALIDDATA;
}
if (buf_size < header_size || header_size < XWD_HEADER_SIZE) {
av_log(avctx, AV_LOG_ERROR, "invalid header size\n");
return AVERROR_INVALIDDATA;
}
pixformat = bytestream2_get_be32u(&gb);
pixdepth = bytestream2_get_be32u(&gb);
width = bytestream2_get_be32u(&gb);
height = bytestream2_get_be32u(&gb);
xoffset = bytestream2_get_be32u(&gb);
be = bytestream2_get_be32u(&gb);
bunit = bytestream2_get_be32u(&gb);
bitorder = bytestream2_get_be32u(&gb);
bpad = bytestream2_get_be32u(&gb);
bpp = bytestream2_get_be32u(&gb);
lsize = bytestream2_get_be32u(&gb);
vclass = bytestream2_get_be32u(&gb);
rgb[0] = bytestream2_get_be32u(&gb);
rgb[1] = bytestream2_get_be32u(&gb);
rgb[2] = bytestream2_get_be32u(&gb);
bytestream2_skipu(&gb, 8);
ncolors = bytestream2_get_be32u(&gb);
bytestream2_skipu(&gb, header_size - (XWD_HEADER_SIZE - 20));
if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
return ret;
av_log(avctx, AV_LOG_DEBUG,
"pixformat %"PRIu32", pixdepth %"PRIu32", bunit %"PRIu32", bitorder %"PRIu32", bpad %"PRIu32"\n",
pixformat, pixdepth, bunit, bitorder, bpad);
av_log(avctx, AV_LOG_DEBUG,
"vclass %"PRIu32", ncolors %"PRIu32", bpp %"PRIu32", be %"PRIu32", lsize %"PRIu32", xoffset %"PRIu32"\n",
vclass, ncolors, bpp, be, lsize, xoffset);
av_log(avctx, AV_LOG_DEBUG,
"red %0"PRIx32", green %0"PRIx32", blue %0"PRIx32"\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) {
avpriv_request_sample(avctx, "xoffset %"PRIu32"", 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 (bytestream2_get_bytes_left(&gb) < ncolors * XWD_CMAP_SIZE + (uint64_t)avctx->height * lsize) {
av_log(avctx, AV_LOG_ERROR, "input buffer too small\n");
return AVERROR_INVALIDDATA;
}
if (pixformat != XWD_Z_PIXMAP) {
avpriv_report_missing_feature(avctx, "Pixmap format %"PRIu32, pixformat);
return AVERROR_PATCHWELCOME;
}
avctx->pix_fmt = AV_PIX_FMT_NONE;
switch (vclass) {
case XWD_STATIC_GRAY:
case XWD_GRAY_SCALE:
if (bpp != 1 && bpp != 8)
return AVERROR_INVALIDDATA;
if (bpp == 1 && pixdepth == 1) {
avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
} else if (bpp == 8 && pixdepth == 8) {
avctx->pix_fmt = AV_PIX_FMT_GRAY8;
}
break;
case XWD_STATIC_COLOR:
case XWD_PSEUDO_COLOR:
if (bpp == 8)
avctx->pix_fmt = AV_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 ? AV_PIX_FMT_RGB555BE : AV_PIX_FMT_RGB555LE;
else if (rgb[0] == 0x1F && rgb[1] == 0x3E0 && rgb[2] == 0x7C00)
avctx->pix_fmt = be ? AV_PIX_FMT_BGR555BE : AV_PIX_FMT_BGR555LE;
} else if (bpp == 16 && pixdepth == 16) {
if (rgb[0] == 0xF800 && rgb[1] == 0x7E0 && rgb[2] == 0x1F)
avctx->pix_fmt = be ? AV_PIX_FMT_RGB565BE : AV_PIX_FMT_RGB565LE;
else if (rgb[0] == 0x1F && rgb[1] == 0x7E0 && rgb[2] == 0xF800)
avctx->pix_fmt = be ? AV_PIX_FMT_BGR565BE : AV_PIX_FMT_BGR565LE;
} else if (bpp == 24) {
if (rgb[0] == 0xFF0000 && rgb[1] == 0xFF00 && rgb[2] == 0xFF)
avctx->pix_fmt = be ? AV_PIX_FMT_RGB24 : AV_PIX_FMT_BGR24;
else if (rgb[0] == 0xFF && rgb[1] == 0xFF00 && rgb[2] == 0xFF0000)
avctx->pix_fmt = be ? AV_PIX_FMT_BGR24 : AV_PIX_FMT_RGB24;
} else if (bpp == 32) {
if (rgb[0] == 0xFF0000 && rgb[1] == 0xFF00 && rgb[2] == 0xFF)
avctx->pix_fmt = be ? AV_PIX_FMT_ARGB : AV_PIX_FMT_BGRA;
else if (rgb[0] == 0xFF && rgb[1] == 0xFF00 && rgb[2] == 0xFF0000)
avctx->pix_fmt = be ? AV_PIX_FMT_ABGR : AV_PIX_FMT_RGBA;
}
bytestream2_skipu(&gb, ncolors * XWD_CMAP_SIZE);
break;
default:
av_log(avctx, AV_LOG_ERROR, "invalid visual class\n");
return AVERROR_INVALIDDATA;
}
if (avctx->pix_fmt == AV_PIX_FMT_NONE) {
avpriv_request_sample(avctx,
"Unknown file: bpp %"PRIu32", pixdepth %"PRIu32", vclass %"PRIu32"",
bpp, pixdepth, vclass);
return AVERROR_PATCHWELCOME;
}
if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
return ret;
p->key_frame = 1;
p->pict_type = AV_PICTURE_TYPE_I;
if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
uint32_t *dst = (uint32_t *)p->data[1];
uint8_t red, green, blue;
for (i = 0; i < ncolors; i++) {
bytestream2_skipu(&gb, 4); // skip colormap entry number
red = bytestream2_get_byteu(&gb);
bytestream2_skipu(&gb, 1);
green = bytestream2_get_byteu(&gb);
bytestream2_skipu(&gb, 1);
blue = bytestream2_get_byteu(&gb);
bytestream2_skipu(&gb, 3); // skip bitmask flag and padding
dst[i] = 0xFFU << 24 | red << 16 | green << 8 | blue;
}
}
ptr = p->data[0];
for (i = 0; i < avctx->height; i++) {
bytestream2_get_bufferu(&gb, ptr, rsize);
bytestream2_skipu(&gb, lsize - rsize);
ptr += p->linesize[0];
}
*got_frame = 1;
return buf_size;
}
const FFCodec ff_xwd_decoder = {
.p.name = "xwd",
.p.long_name = NULL_IF_CONFIG_SMALL("XWD (X Window Dump) image"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_XWD,
.p.capabilities = AV_CODEC_CAP_DR1,
FF_CODEC_DECODE_CB(xwd_decode_frame),
};
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