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247 lines
8.6 KiB
C
247 lines
8.6 KiB
C
/*
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* XWD image format
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*
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* Copyright (c) 2012 Paul B Mahol
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/intreadwrite.h"
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#include "libavutil/pixdesc.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "xwd.h"
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#define WINDOW_NAME "lavcxwdenc"
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#define WINDOW_NAME_SIZE 11
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static av_cold int xwd_encode_init(AVCodecContext *avctx)
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{
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avctx->coded_frame = avcodec_alloc_frame();
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if (!avctx->coded_frame)
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return AVERROR(ENOMEM);
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return 0;
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}
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static int xwd_encode_frame(AVCodecContext *avctx, uint8_t *buf,
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int buf_size, void *data)
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{
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AVFrame *p = data;
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enum PixelFormat pix_fmt = avctx->pix_fmt;
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uint32_t pixdepth, bpp, bpad, ncolors = 0, lsize, vclass, be = 0;
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uint32_t rgb[3] = { 0 };
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uint32_t header_size;
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int i, out_size;
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uint8_t *ptr;
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pixdepth = av_get_bits_per_pixel(&av_pix_fmt_descriptors[pix_fmt]);
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if (av_pix_fmt_descriptors[pix_fmt].flags & PIX_FMT_BE)
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be = 1;
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switch (pix_fmt) {
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case PIX_FMT_ARGB:
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case PIX_FMT_BGRA:
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case PIX_FMT_RGBA:
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case PIX_FMT_ABGR:
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if (pix_fmt == PIX_FMT_ARGB ||
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pix_fmt == PIX_FMT_ABGR)
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be = 1;
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if (pix_fmt == PIX_FMT_ABGR ||
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pix_fmt == PIX_FMT_RGBA) {
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rgb[0] = 0xFF;
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rgb[1] = 0xFF00;
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rgb[2] = 0xFF0000;
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} else {
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rgb[0] = 0xFF0000;
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rgb[1] = 0xFF00;
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rgb[2] = 0xFF;
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}
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bpp = 32;
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pixdepth = 24;
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vclass = XWD_TRUE_COLOR;
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bpad = 32;
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break;
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case PIX_FMT_BGR24:
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case PIX_FMT_RGB24:
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if (pix_fmt == PIX_FMT_RGB24)
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be = 1;
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bpp = 24;
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vclass = XWD_TRUE_COLOR;
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bpad = 32;
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rgb[0] = 0xFF0000;
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rgb[1] = 0xFF00;
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rgb[2] = 0xFF;
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break;
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case PIX_FMT_RGB565LE:
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case PIX_FMT_RGB565BE:
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case PIX_FMT_BGR565LE:
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case PIX_FMT_BGR565BE:
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if (pix_fmt == PIX_FMT_BGR565LE ||
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pix_fmt == PIX_FMT_BGR565BE) {
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rgb[0] = 0x1F;
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rgb[1] = 0x7E0;
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rgb[2] = 0xF800;
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} else {
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rgb[0] = 0xF800;
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rgb[1] = 0x7E0;
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rgb[2] = 0x1F;
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}
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bpp = 16;
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vclass = XWD_TRUE_COLOR;
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bpad = 16;
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break;
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case PIX_FMT_RGB555LE:
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case PIX_FMT_RGB555BE:
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case PIX_FMT_BGR555LE:
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case PIX_FMT_BGR555BE:
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if (pix_fmt == PIX_FMT_BGR555LE ||
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pix_fmt == PIX_FMT_BGR555BE) {
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rgb[0] = 0x1F;
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rgb[1] = 0x3E0;
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rgb[2] = 0x7C00;
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} else {
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rgb[0] = 0x7C00;
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rgb[1] = 0x3E0;
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rgb[2] = 0x1F;
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}
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bpp = 16;
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vclass = XWD_TRUE_COLOR;
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bpad = 16;
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break;
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case PIX_FMT_RGB8:
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case PIX_FMT_BGR8:
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case PIX_FMT_RGB4_BYTE:
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case PIX_FMT_BGR4_BYTE:
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case PIX_FMT_PAL8:
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bpp = 8;
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vclass = XWD_PSEUDO_COLOR;
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bpad = 8;
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ncolors = 256;
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break;
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case PIX_FMT_MONOWHITE:
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bpp = 1;
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bpad = 8;
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vclass = XWD_STATIC_GRAY;
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break;
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default:
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av_log(avctx, AV_LOG_INFO, "unsupported pixel format\n");
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return AVERROR(EINVAL);
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}
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lsize = FFALIGN(bpp * avctx->width, bpad) / 8;
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header_size = XWD_HEADER_SIZE + WINDOW_NAME_SIZE;
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out_size = header_size + ncolors * XWD_CMAP_SIZE + avctx->height * lsize;
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if (buf_size < out_size) {
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av_log(avctx, AV_LOG_ERROR, "output buffer too small\n");
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return AVERROR(ENOMEM);
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}
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avctx->coded_frame->key_frame = 1;
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avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
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bytestream_put_be32(&buf, header_size);
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bytestream_put_be32(&buf, XWD_VERSION); // file version
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bytestream_put_be32(&buf, XWD_Z_PIXMAP); // pixmap format
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bytestream_put_be32(&buf, pixdepth); // pixmap depth in pixels
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bytestream_put_be32(&buf, avctx->width); // pixmap width in pixels
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bytestream_put_be32(&buf, avctx->height); // pixmap height in pixels
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bytestream_put_be32(&buf, 0); // bitmap x offset
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bytestream_put_be32(&buf, be); // byte order
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bytestream_put_be32(&buf, 32); // bitmap unit
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bytestream_put_be32(&buf, be); // bit-order of image data
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bytestream_put_be32(&buf, bpad); // bitmap scan-line pad in bits
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bytestream_put_be32(&buf, bpp); // bits per pixel
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bytestream_put_be32(&buf, lsize); // bytes per scan-line
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bytestream_put_be32(&buf, vclass); // visual class
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bytestream_put_be32(&buf, rgb[0]); // red mask
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bytestream_put_be32(&buf, rgb[1]); // green mask
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bytestream_put_be32(&buf, rgb[2]); // blue mask
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bytestream_put_be32(&buf, 8); // size of each bitmask in bits
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bytestream_put_be32(&buf, ncolors); // number of colors
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bytestream_put_be32(&buf, ncolors); // number of entries in color map
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bytestream_put_be32(&buf, avctx->width); // window width
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bytestream_put_be32(&buf, avctx->height); // window height
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bytestream_put_be32(&buf, 0); // window upper left X coordinate
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bytestream_put_be32(&buf, 0); // window upper left Y coordinate
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bytestream_put_be32(&buf, 0); // window border width
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bytestream_put_buffer(&buf, WINDOW_NAME, WINDOW_NAME_SIZE);
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for (i = 0; i < ncolors; i++) {
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uint32_t val;
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uint8_t red, green, blue;
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val = AV_RN32A(p->data[1] + i * 4);
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red = (val >> 16) & 0xFF;
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green = (val >> 8) & 0xFF;
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blue = val & 0xFF;
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bytestream_put_be32(&buf, i); // colormap entry number
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bytestream_put_be16(&buf, red << 8);
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bytestream_put_be16(&buf, green << 8);
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bytestream_put_be16(&buf, blue << 8);
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bytestream_put_byte(&buf, 0x7); // bitmask flag
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bytestream_put_byte(&buf, 0); // padding
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}
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ptr = p->data[0];
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for (i = 0; i < avctx->height; i++) {
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bytestream_put_buffer(&buf, ptr, lsize);
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ptr += p->linesize[0];
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}
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return out_size;
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}
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static av_cold int xwd_encode_close(AVCodecContext *avctx)
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{
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av_freep(&avctx->coded_frame);
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return 0;
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}
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AVCodec ff_xwd_encoder = {
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.name = "xwd",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = CODEC_ID_XWD,
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.init = xwd_encode_init,
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.encode = xwd_encode_frame,
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.close = xwd_encode_close,
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.pix_fmts = (const enum PixelFormat[]) { PIX_FMT_BGRA,
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PIX_FMT_RGBA,
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PIX_FMT_ARGB,
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PIX_FMT_ABGR,
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PIX_FMT_RGB24,
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PIX_FMT_BGR24,
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PIX_FMT_RGB565BE,
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PIX_FMT_RGB565LE,
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PIX_FMT_BGR565BE,
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PIX_FMT_BGR565LE,
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PIX_FMT_RGB555BE,
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PIX_FMT_RGB555LE,
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PIX_FMT_BGR555BE,
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PIX_FMT_BGR555LE,
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PIX_FMT_RGB8,
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PIX_FMT_BGR8,
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PIX_FMT_RGB4_BYTE,
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PIX_FMT_BGR4_BYTE,
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PIX_FMT_PAL8,
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PIX_FMT_MONOWHITE,
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PIX_FMT_NONE },
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.long_name = NULL_IF_CONFIG_SMALL("XWD (X Window Dump) image"),
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};
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