yading@10: /*
yading@10:  * XWD image format
yading@10:  *
yading@10:  * Copyright (c) 2012 Paul B Mahol
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include "libavutil/imgutils.h"
yading@10: #include "avcodec.h"
yading@10: #include "bytestream.h"
yading@10: #include "internal.h"
yading@10: #include "xwd.h"
yading@10: 
yading@10: static int xwd_decode_frame(AVCodecContext *avctx, void *data,
yading@10:                             int *got_frame, AVPacket *avpkt)
yading@10: {
yading@10:     AVFrame *p = data;
yading@10:     const uint8_t *buf = avpkt->data;
yading@10:     int i, ret, buf_size = avpkt->size;
yading@10:     uint32_t version, header_size, vclass, ncolors;
yading@10:     uint32_t xoffset, be, bpp, lsize, rsize;
yading@10:     uint32_t pixformat, pixdepth, bunit, bitorder, bpad;
yading@10:     uint32_t rgb[3];
yading@10:     uint8_t *ptr;
yading@10:     GetByteContext gb;
yading@10: 
yading@10:     if (buf_size < XWD_HEADER_SIZE)
yading@10:         return AVERROR_INVALIDDATA;
yading@10: 
yading@10:     bytestream2_init(&gb, buf, buf_size);
yading@10:     header_size = bytestream2_get_be32u(&gb);
yading@10: 
yading@10:     version = bytestream2_get_be32u(&gb);
yading@10:     if (version != XWD_VERSION) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "unsupported version\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if (buf_size < header_size || header_size < XWD_HEADER_SIZE) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "invalid header size\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     pixformat     = bytestream2_get_be32u(&gb);
yading@10:     pixdepth      = bytestream2_get_be32u(&gb);
yading@10:     avctx->width  = bytestream2_get_be32u(&gb);
yading@10:     avctx->height = bytestream2_get_be32u(&gb);
yading@10:     xoffset       = bytestream2_get_be32u(&gb);
yading@10:     be            = bytestream2_get_be32u(&gb);
yading@10:     bunit         = bytestream2_get_be32u(&gb);
yading@10:     bitorder      = bytestream2_get_be32u(&gb);
yading@10:     bpad          = bytestream2_get_be32u(&gb);
yading@10:     bpp           = bytestream2_get_be32u(&gb);
yading@10:     lsize         = bytestream2_get_be32u(&gb);
yading@10:     vclass        = bytestream2_get_be32u(&gb);
yading@10:     rgb[0]        = bytestream2_get_be32u(&gb);
yading@10:     rgb[1]        = bytestream2_get_be32u(&gb);
yading@10:     rgb[2]        = bytestream2_get_be32u(&gb);
yading@10:     bytestream2_skipu(&gb, 8);
yading@10:     ncolors       = bytestream2_get_be32u(&gb);
yading@10:     bytestream2_skipu(&gb, header_size - (XWD_HEADER_SIZE - 20));
yading@10: 
yading@10:     av_log(avctx, AV_LOG_DEBUG, "pixformat %d, pixdepth %d, bunit %d, bitorder %d, bpad %d\n",
yading@10:            pixformat, pixdepth, bunit, bitorder, bpad);
yading@10:     av_log(avctx, AV_LOG_DEBUG, "vclass %d, ncolors %d, bpp %d, be %d, lsize %d, xoffset %d\n",
yading@10:            vclass, ncolors, bpp, be, lsize, xoffset);
yading@10:     av_log(avctx, AV_LOG_DEBUG, "red %0x, green %0x, blue %0x\n", rgb[0], rgb[1], rgb[2]);
yading@10: 
yading@10:     if (pixformat > XWD_Z_PIXMAP) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "invalid pixmap format\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if (pixdepth == 0 || pixdepth > 32) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "invalid pixmap depth\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if (xoffset) {
yading@10:         avpriv_request_sample(avctx, "xoffset %d", xoffset);
yading@10:         return AVERROR_PATCHWELCOME;
yading@10:     }
yading@10: 
yading@10:     if (be > 1) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "invalid byte order\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if (bitorder > 1) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "invalid bitmap bit order\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if (bunit != 8 && bunit != 16 && bunit != 32) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "invalid bitmap unit\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if (bpad != 8 && bpad != 16 && bpad != 32) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "invalid bitmap scan-line pad\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if (bpp == 0 || bpp > 32) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "invalid bits per pixel\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if (ncolors > 256) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "invalid number of entries in colormap\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if ((ret = av_image_check_size(avctx->width, avctx->height, 0, NULL)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     rsize = FFALIGN(avctx->width * bpp, bpad) / 8;
yading@10:     if (lsize < rsize) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "invalid bytes per scan-line\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if (bytestream2_get_bytes_left(&gb) < ncolors * XWD_CMAP_SIZE + avctx->height * lsize) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "input buffer too small\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if (pixformat != XWD_Z_PIXMAP) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "pixmap format %d unsupported\n", pixformat);
yading@10:         return AVERROR_PATCHWELCOME;
yading@10:     }
yading@10: 
yading@10:     avctx->pix_fmt = AV_PIX_FMT_NONE;
yading@10:     switch (vclass) {
yading@10:     case XWD_STATIC_GRAY:
yading@10:     case XWD_GRAY_SCALE:
yading@10:         if (bpp != 1 && bpp != 8)
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         if (pixdepth == 1) {
yading@10:             avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
yading@10:         } else if (pixdepth == 8) {
yading@10:             avctx->pix_fmt = AV_PIX_FMT_GRAY8;
yading@10:         }
yading@10:         break;
yading@10:     case XWD_STATIC_COLOR:
yading@10:     case XWD_PSEUDO_COLOR:
yading@10:         if (bpp == 8)
yading@10:             avctx->pix_fmt = AV_PIX_FMT_PAL8;
yading@10:         break;
yading@10:     case XWD_TRUE_COLOR:
yading@10:     case XWD_DIRECT_COLOR:
yading@10:         if (bpp != 16 && bpp != 24 && bpp != 32)
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         if (bpp == 16 && pixdepth == 15) {
yading@10:             if (rgb[0] == 0x7C00 && rgb[1] == 0x3E0 && rgb[2] == 0x1F)
yading@10:                 avctx->pix_fmt = be ? AV_PIX_FMT_RGB555BE : AV_PIX_FMT_RGB555LE;
yading@10:             else if (rgb[0] == 0x1F && rgb[1] == 0x3E0 && rgb[2] == 0x7C00)
yading@10:                 avctx->pix_fmt = be ? AV_PIX_FMT_BGR555BE : AV_PIX_FMT_BGR555LE;
yading@10:         } else if (bpp == 16 && pixdepth == 16) {
yading@10:             if (rgb[0] == 0xF800 && rgb[1] == 0x7E0 && rgb[2] == 0x1F)
yading@10:                 avctx->pix_fmt = be ? AV_PIX_FMT_RGB565BE : AV_PIX_FMT_RGB565LE;
yading@10:             else if (rgb[0] == 0x1F && rgb[1] == 0x7E0 && rgb[2] == 0xF800)
yading@10:                 avctx->pix_fmt = be ? AV_PIX_FMT_BGR565BE : AV_PIX_FMT_BGR565LE;
yading@10:         } else if (bpp == 24) {
yading@10:             if (rgb[0] == 0xFF0000 && rgb[1] == 0xFF00 && rgb[2] == 0xFF)
yading@10:                 avctx->pix_fmt = be ? AV_PIX_FMT_RGB24 : AV_PIX_FMT_BGR24;
yading@10:             else if (rgb[0] == 0xFF && rgb[1] == 0xFF00 && rgb[2] == 0xFF0000)
yading@10:                 avctx->pix_fmt = be ? AV_PIX_FMT_BGR24 : AV_PIX_FMT_RGB24;
yading@10:         } else if (bpp == 32) {
yading@10:             if (rgb[0] == 0xFF0000 && rgb[1] == 0xFF00 && rgb[2] == 0xFF)
yading@10:                 avctx->pix_fmt = be ? AV_PIX_FMT_ARGB : AV_PIX_FMT_BGRA;
yading@10:             else if (rgb[0] == 0xFF && rgb[1] == 0xFF00 && rgb[2] == 0xFF0000)
yading@10:                 avctx->pix_fmt = be ? AV_PIX_FMT_ABGR : AV_PIX_FMT_RGBA;
yading@10:         }
yading@10:         bytestream2_skipu(&gb, ncolors * XWD_CMAP_SIZE);
yading@10:         break;
yading@10:     default:
yading@10:         av_log(avctx, AV_LOG_ERROR, "invalid visual class\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if (avctx->pix_fmt == AV_PIX_FMT_NONE) {
yading@10:         avpriv_request_sample(avctx,
yading@10:                               "Unknown file: bpp %d, pixdepth %d, vclass %d",
yading@10:                               bpp, pixdepth, vclass);
yading@10:         return AVERROR_PATCHWELCOME;
yading@10:     }
yading@10: 
yading@10:     if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     p->key_frame = 1;
yading@10:     p->pict_type = AV_PICTURE_TYPE_I;
yading@10: 
yading@10:     if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
yading@10:         uint32_t *dst = (uint32_t *)p->data[1];
yading@10:         uint8_t red, green, blue;
yading@10: 
yading@10:         for (i = 0; i < ncolors; i++) {
yading@10: 
yading@10:             bytestream2_skipu(&gb, 4); // skip colormap entry number
yading@10:             red    = bytestream2_get_byteu(&gb);
yading@10:             bytestream2_skipu(&gb, 1);
yading@10:             green  = bytestream2_get_byteu(&gb);
yading@10:             bytestream2_skipu(&gb, 1);
yading@10:             blue   = bytestream2_get_byteu(&gb);
yading@10:             bytestream2_skipu(&gb, 3); // skip bitmask flag and padding
yading@10: 
yading@10:             dst[i] = red << 16 | green << 8 | blue;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     ptr = p->data[0];
yading@10:     for (i = 0; i < avctx->height; i++) {
yading@10:         bytestream2_get_bufferu(&gb, ptr, rsize);
yading@10:         bytestream2_skipu(&gb, lsize - rsize);
yading@10:         ptr += p->linesize[0];
yading@10:     }
yading@10: 
yading@10:     *got_frame       = 1;
yading@10: 
yading@10:     return buf_size;
yading@10: }
yading@10: 
yading@10: AVCodec ff_xwd_decoder = {
yading@10:     .name           = "xwd",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_XWD,
yading@10:     .decode         = xwd_decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("XWD (X Window Dump) image"),
yading@10: };