From 27ed027bcdcb7445ab62d4870a8be3615ffc1e31 Mon Sep 17 00:00:00 2001 From: Paul B Mahol Date: Sat, 21 Jan 2012 17:45:52 +0000 Subject: XWD encoder and decoder Signed-off-by: Kostya Shishkov --- libavcodec/xwddec.c | 267 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 267 insertions(+) create mode 100644 libavcodec/xwddec.c (limited to 'libavcodec/xwddec.c') diff --git a/libavcodec/xwddec.c b/libavcodec/xwddec.c new file mode 100644 index 0000000000..97f3a6a979 --- /dev/null +++ b/libavcodec/xwddec.c @@ -0,0 +1,267 @@ +/* + * 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"), +}; -- cgit v1.2.3