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FFmpeg/libavcodec/xwdenc.c

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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/intreadwrite.h"
#include "libavutil/pixdesc.h"
#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"
#include "xwd.h"
#define WINDOW_NAME "lavcxwdenc"
#define WINDOW_NAME_SIZE 11
static av_cold int xwd_encode_init(AVCodecContext *avctx)
{
avctx->coded_frame = avcodec_alloc_frame();
if (!avctx->coded_frame)
return AVERROR(ENOMEM);
return 0;
}
static int xwd_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *p, int *got_packet)
{
enum AVPixelFormat pix_fmt = avctx->pix_fmt;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
uint32_t pixdepth, bpp, bpad, ncolors = 0, lsize, vclass, be = 0;
uint32_t rgb[3] = { 0 }, bitorder = 0;
uint32_t header_size;
int i, out_size, ret;
uint8_t *ptr, *buf;
pixdepth = av_get_bits_per_pixel(desc);
if (desc->flags & AV_PIX_FMT_FLAG_BE)
be = 1;
switch (pix_fmt) {
case AV_PIX_FMT_ARGB:
case AV_PIX_FMT_BGRA:
case AV_PIX_FMT_RGBA:
case AV_PIX_FMT_ABGR:
if (pix_fmt == AV_PIX_FMT_ARGB ||
pix_fmt == AV_PIX_FMT_ABGR)
be = 1;
if (pix_fmt == AV_PIX_FMT_ABGR ||
pix_fmt == AV_PIX_FMT_RGBA) {
rgb[0] = 0xFF;
rgb[1] = 0xFF00;
rgb[2] = 0xFF0000;
} else {
rgb[0] = 0xFF0000;
rgb[1] = 0xFF00;
rgb[2] = 0xFF;
}
bpp = 32;
pixdepth = 24;
vclass = XWD_TRUE_COLOR;
bpad = 32;
break;
case AV_PIX_FMT_BGR24:
case AV_PIX_FMT_RGB24:
if (pix_fmt == AV_PIX_FMT_RGB24)
be = 1;
bpp = 24;
vclass = XWD_TRUE_COLOR;
bpad = 32;
rgb[0] = 0xFF0000;
rgb[1] = 0xFF00;
rgb[2] = 0xFF;
break;
case AV_PIX_FMT_RGB565LE:
case AV_PIX_FMT_RGB565BE:
case AV_PIX_FMT_BGR565LE:
case AV_PIX_FMT_BGR565BE:
if (pix_fmt == AV_PIX_FMT_BGR565LE ||
pix_fmt == AV_PIX_FMT_BGR565BE) {
rgb[0] = 0x1F;
rgb[1] = 0x7E0;
rgb[2] = 0xF800;
} else {
rgb[0] = 0xF800;
rgb[1] = 0x7E0;
rgb[2] = 0x1F;
}
bpp = 16;
vclass = XWD_TRUE_COLOR;
bpad = 16;
break;
case AV_PIX_FMT_RGB555LE:
case AV_PIX_FMT_RGB555BE:
case AV_PIX_FMT_BGR555LE:
case AV_PIX_FMT_BGR555BE:
if (pix_fmt == AV_PIX_FMT_BGR555LE ||
pix_fmt == AV_PIX_FMT_BGR555BE) {
rgb[0] = 0x1F;
rgb[1] = 0x3E0;
rgb[2] = 0x7C00;
} else {
rgb[0] = 0x7C00;
rgb[1] = 0x3E0;
rgb[2] = 0x1F;
}
bpp = 16;
vclass = XWD_TRUE_COLOR;
bpad = 16;
break;
case AV_PIX_FMT_RGB8:
case AV_PIX_FMT_BGR8:
case AV_PIX_FMT_RGB4_BYTE:
case AV_PIX_FMT_BGR4_BYTE:
case AV_PIX_FMT_PAL8:
bpp = 8;
vclass = XWD_PSEUDO_COLOR;
bpad = 8;
ncolors = 256;
break;
case AV_PIX_FMT_MONOWHITE:
be = 1;
bitorder = 1;
bpp = 1;
bpad = 8;
vclass = XWD_STATIC_GRAY;
break;
default:
av_log(avctx, AV_LOG_INFO, "unsupported pixel format\n");
return AVERROR(EINVAL);
}
lsize = FFALIGN(bpp * avctx->width, bpad) / 8;
header_size = XWD_HEADER_SIZE + WINDOW_NAME_SIZE;
out_size = header_size + ncolors * XWD_CMAP_SIZE + avctx->height * lsize;
if ((ret = ff_alloc_packet(pkt, out_size)) < 0) {
av_log(avctx, AV_LOG_ERROR, "output buffer too small\n");
return ret;
}
buf = pkt->data;
avctx->coded_frame->key_frame = 1;
avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
bytestream_put_be32(&buf, header_size);
bytestream_put_be32(&buf, XWD_VERSION); // file version
bytestream_put_be32(&buf, XWD_Z_PIXMAP); // pixmap format
bytestream_put_be32(&buf, pixdepth); // pixmap depth in pixels
bytestream_put_be32(&buf, avctx->width); // pixmap width in pixels
bytestream_put_be32(&buf, avctx->height); // pixmap height in pixels
bytestream_put_be32(&buf, 0); // bitmap x offset
bytestream_put_be32(&buf, be); // byte order
bytestream_put_be32(&buf, 32); // bitmap unit
bytestream_put_be32(&buf, bitorder); // bit-order of image data
bytestream_put_be32(&buf, bpad); // bitmap scan-line pad in bits
bytestream_put_be32(&buf, bpp); // bits per pixel
bytestream_put_be32(&buf, lsize); // bytes per scan-line
bytestream_put_be32(&buf, vclass); // visual class
bytestream_put_be32(&buf, rgb[0]); // red mask
bytestream_put_be32(&buf, rgb[1]); // green mask
bytestream_put_be32(&buf, rgb[2]); // blue mask
bytestream_put_be32(&buf, 8); // size of each bitmask in bits
bytestream_put_be32(&buf, ncolors); // number of colors
bytestream_put_be32(&buf, ncolors); // number of entries in color map
bytestream_put_be32(&buf, avctx->width); // window width
bytestream_put_be32(&buf, avctx->height); // window height
bytestream_put_be32(&buf, 0); // window upper left X coordinate
bytestream_put_be32(&buf, 0); // window upper left Y coordinate
bytestream_put_be32(&buf, 0); // window border width
bytestream_put_buffer(&buf, WINDOW_NAME, WINDOW_NAME_SIZE);
for (i = 0; i < ncolors; i++) {
uint32_t val;
uint8_t red, green, blue;
val = AV_RN32A(p->data[1] + i * 4);
red = (val >> 16) & 0xFF;
green = (val >> 8) & 0xFF;
blue = val & 0xFF;
bytestream_put_be32(&buf, i); // colormap entry number
bytestream_put_be16(&buf, red << 8);
bytestream_put_be16(&buf, green << 8);
bytestream_put_be16(&buf, blue << 8);
bytestream_put_byte(&buf, 0x7); // bitmask flag
bytestream_put_byte(&buf, 0); // padding
}
ptr = p->data[0];
for (i = 0; i < avctx->height; i++) {
bytestream_put_buffer(&buf, ptr, lsize);
ptr += p->linesize[0];
}
pkt->flags |= AV_PKT_FLAG_KEY;
*got_packet = 1;
return 0;
}
static av_cold int xwd_encode_close(AVCodecContext *avctx)
{
av_freep(&avctx->coded_frame);
return 0;
}
AVCodec ff_xwd_encoder = {
.name = "xwd",
.long_name = NULL_IF_CONFIG_SMALL("XWD (X Window Dump) image"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_XWD,
.init = xwd_encode_init,
.encode2 = xwd_encode_frame,
.close = xwd_encode_close,
.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_BGRA,
AV_PIX_FMT_RGBA,
AV_PIX_FMT_ARGB,
AV_PIX_FMT_ABGR,
AV_PIX_FMT_RGB24,
AV_PIX_FMT_BGR24,
AV_PIX_FMT_RGB565BE,
AV_PIX_FMT_RGB565LE,
AV_PIX_FMT_BGR565BE,
AV_PIX_FMT_BGR565LE,
AV_PIX_FMT_RGB555BE,
AV_PIX_FMT_RGB555LE,
AV_PIX_FMT_BGR555BE,
AV_PIX_FMT_BGR555LE,
AV_PIX_FMT_RGB8,
AV_PIX_FMT_BGR8,
AV_PIX_FMT_RGB4_BYTE,
AV_PIX_FMT_BGR4_BYTE,
AV_PIX_FMT_PAL8,
AV_PIX_FMT_MONOWHITE,
AV_PIX_FMT_NONE },
};