| /* |
| * 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"), |
| }; |
