[libav-commits] XWD encoder and decoder

Paul B Mahol git at libav.org
Mon Jan 23 19:03:59 CET 2012


Module: libav
Branch: master
Commit: 27ed027bcdcb7445ab62d4870a8be3615ffc1e31

Author:    Paul B Mahol <onemda at gmail.com>
Committer: Kostya Shishkov <kostya.shishkov at gmail.com>
Date:      Sat Jan 21 17:45:52 2012 +0000

XWD encoder and decoder

Signed-off-by: Kostya Shishkov <kostya.shishkov at gmail.com>

---

 Changelog              |    1 +
 doc/general.texi       |    2 +
 libavcodec/Makefile    |    2 +
 libavcodec/allcodecs.c |    1 +
 libavcodec/avcodec.h   |    1 +
 libavcodec/version.h   |    2 +-
 libavcodec/xwd.h       |   41 ++++++++
 libavcodec/xwddec.c    |  267 ++++++++++++++++++++++++++++++++++++++++++++++++
 libavcodec/xwdenc.c    |  246 ++++++++++++++++++++++++++++++++++++++++++++
 libavformat/img2.c     |    3 +-
 10 files changed, 564 insertions(+), 2 deletions(-)

diff --git a/Changelog b/Changelog
index f153074..ae092b1 100644
--- a/Changelog
+++ b/Changelog
@@ -6,6 +6,7 @@ version 0.8:
 
 - GSM audio parser
 - SMJPEG muxer
+- XWD encoder and decoder
 
 
 version 0.8_beta2:
diff --git a/doc/general.texi b/doc/general.texi
index 79af887..cda79c0 100644
--- a/doc/general.texi
+++ b/doc/general.texi
@@ -379,6 +379,8 @@ following image formats are supported:
     @tab YUV, JPEG and some extension is not supported yet.
 @item Truevision Targa  @tab X @tab X
     @tab Targa (.TGA) image format
+ at item XWD  @tab X @tab X
+    @tab X Window Dump image format
 @end multitable
 
 @code{X} means that encoding (resp. decoding) is supported.
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 1e8d09b..3468f66 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -435,6 +435,8 @@ OBJS-$(CONFIG_XAN_WC4_DECODER)         += xxan.o
 OBJS-$(CONFIG_XL_DECODER)              += xl.o
 OBJS-$(CONFIG_XSUB_DECODER)            += xsubdec.o
 OBJS-$(CONFIG_XSUB_ENCODER)            += xsubenc.o
+OBJS-$(CONFIG_XWD_DECODER)             += xwddec.o
+OBJS-$(CONFIG_XWD_ENCODER)             += xwdenc.o
 OBJS-$(CONFIG_YOP_DECODER)             += yop.o
 OBJS-$(CONFIG_ZLIB_DECODER)            += lcldec.o
 OBJS-$(CONFIG_ZLIB_ENCODER)            += lclenc.o
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index 5289692..d00bd0b 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -230,6 +230,7 @@ void avcodec_register_all(void)
     REGISTER_DECODER (XAN_WC3, xan_wc3);
     REGISTER_DECODER (XAN_WC4, xan_wc4);
     REGISTER_DECODER (XL, xl);
+    REGISTER_ENCDEC  (XWD, xwd);
     REGISTER_DECODER (YOP, yop);
     REGISTER_ENCDEC  (ZLIB, zlib);
     REGISTER_ENCDEC  (ZMBV, zmbv);
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index be1b202..967a134 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -254,6 +254,7 @@ enum CodecID {
     CODEC_ID_VBLE,
     CODEC_ID_DXTORY,
     CODEC_ID_V410,
+    CODEC_ID_XWD,
 
     /* various PCM "codecs" */
     CODEC_ID_FIRST_AUDIO = 0x10000,     ///< A dummy id pointing at the start of audio codecs
diff --git a/libavcodec/version.h b/libavcodec/version.h
index c7b4c15..77e1682 100644
--- a/libavcodec/version.h
+++ b/libavcodec/version.h
@@ -21,7 +21,7 @@
 #define AVCODEC_VERSION_H
 
 #define LIBAVCODEC_VERSION_MAJOR 53
-#define LIBAVCODEC_VERSION_MINOR 34
+#define LIBAVCODEC_VERSION_MINOR 35
 #define LIBAVCODEC_VERSION_MICRO  0
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
diff --git a/libavcodec/xwd.h b/libavcodec/xwd.h
new file mode 100644
index 0000000..f41e2cd
--- /dev/null
+++ b/libavcodec/xwd.h
@@ -0,0 +1,41 @@
+/*
+ * 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
+ */
+
+#ifndef AVCODEC_XWD_H
+#define AVCODEC_XWD_H
+
+#define XWD_VERSION         7
+#define XWD_HEADER_SIZE     100
+#define XWD_CMAP_SIZE       12
+
+#define XWD_XY_BITMAP       0
+#define XWD_XY_PIXMAP       1
+#define XWD_Z_PIXMAP        2
+
+#define XWD_STATIC_GRAY     0
+#define XWD_GRAY_SCALE      1
+#define XWD_STATIC_COLOR    2
+#define XWD_PSEUDO_COLOR    3
+#define XWD_TRUE_COLOR      4
+#define XWD_DIRECT_COLOR    5
+
+#endif /* AVCODEC_XWD_H */
diff --git a/libavcodec/xwddec.c b/libavcodec/xwddec.c
new file mode 100644
index 0000000..97f3a6a
--- /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"),
+};
diff --git a/libavcodec/xwdenc.c b/libavcodec/xwdenc.c
new file mode 100644
index 0000000..5bfdaf7
--- /dev/null
+++ b/libavcodec/xwdenc.c
@@ -0,0 +1,246 @@
+/*
+ * 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 "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, uint8_t *buf,
+                            int buf_size, void *data)
+{
+    AVFrame *p = data;
+    enum PixelFormat pix_fmt = avctx->pix_fmt;
+    uint32_t pixdepth, bpp, bpad, ncolors = 0, lsize, vclass, be = 0;
+    uint32_t rgb[3] = { 0 };
+    uint32_t header_size;
+    int i, out_size;
+    uint8_t *ptr;
+
+    pixdepth = av_get_bits_per_pixel(&av_pix_fmt_descriptors[pix_fmt]);
+    if (av_pix_fmt_descriptors[pix_fmt].flags & PIX_FMT_BE)
+        be = 1;
+    switch (pix_fmt) {
+    case PIX_FMT_ARGB:
+    case PIX_FMT_BGRA:
+    case PIX_FMT_RGBA:
+    case PIX_FMT_ABGR:
+        if (pix_fmt == PIX_FMT_ARGB ||
+            pix_fmt == PIX_FMT_ABGR)
+            be = 1;
+        if (pix_fmt == PIX_FMT_ABGR ||
+            pix_fmt == 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 PIX_FMT_BGR24:
+    case PIX_FMT_RGB24:
+        if (pix_fmt == PIX_FMT_RGB24)
+            be = 1;
+        bpp      = 24;
+        vclass   = XWD_TRUE_COLOR;
+        bpad     = 32;
+        rgb[0]   = 0xFF0000;
+        rgb[1]   = 0xFF00;
+        rgb[2]   = 0xFF;
+        break;
+    case PIX_FMT_RGB565LE:
+    case PIX_FMT_RGB565BE:
+    case PIX_FMT_BGR565LE:
+    case PIX_FMT_BGR565BE:
+        if (pix_fmt == PIX_FMT_BGR565LE ||
+            pix_fmt == 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 PIX_FMT_RGB555LE:
+    case PIX_FMT_RGB555BE:
+    case PIX_FMT_BGR555LE:
+    case PIX_FMT_BGR555BE:
+        if (pix_fmt == PIX_FMT_BGR555LE ||
+            pix_fmt == 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 PIX_FMT_RGB8:
+    case PIX_FMT_BGR8:
+    case PIX_FMT_RGB4_BYTE:
+    case PIX_FMT_BGR4_BYTE:
+    case PIX_FMT_PAL8:
+        bpp      = 8;
+        vclass   = XWD_PSEUDO_COLOR;
+        bpad     = 8;
+        ncolors  = 256;
+        break;
+    case PIX_FMT_MONOWHITE:
+        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 (buf_size < out_size) {
+        av_log(avctx, AV_LOG_ERROR, "output buffer too small\n");
+        return AVERROR(ENOMEM);
+    }
+
+    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, be);            // 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];
+    }
+
+    return out_size;
+}
+
+static av_cold int xwd_encode_close(AVCodecContext *avctx)
+{
+    av_freep(&avctx->coded_frame);
+
+    return 0;
+}
+
+AVCodec ff_xwd_encoder = {
+    .name         = "xwd",
+    .type         = AVMEDIA_TYPE_VIDEO,
+    .id           = CODEC_ID_XWD,
+    .init         = xwd_encode_init,
+    .encode       = xwd_encode_frame,
+    .close        = xwd_encode_close,
+    .pix_fmts     = (const enum PixelFormat[]) { PIX_FMT_BGRA,
+                                                 PIX_FMT_RGBA,
+                                                 PIX_FMT_ARGB,
+                                                 PIX_FMT_ABGR,
+                                                 PIX_FMT_RGB24,
+                                                 PIX_FMT_BGR24,
+                                                 PIX_FMT_RGB565BE,
+                                                 PIX_FMT_RGB565LE,
+                                                 PIX_FMT_BGR565BE,
+                                                 PIX_FMT_BGR565LE,
+                                                 PIX_FMT_RGB555BE,
+                                                 PIX_FMT_RGB555LE,
+                                                 PIX_FMT_BGR555BE,
+                                                 PIX_FMT_BGR555LE,
+                                                 PIX_FMT_RGB8,
+                                                 PIX_FMT_BGR8,
+                                                 PIX_FMT_RGB4_BYTE,
+                                                 PIX_FMT_BGR4_BYTE,
+                                                 PIX_FMT_PAL8,
+                                                 PIX_FMT_MONOWHITE,
+                                                 PIX_FMT_NONE },
+    .long_name    = NULL_IF_CONFIG_SMALL("XWD (X Window Dump) image"),
+};
diff --git a/libavformat/img2.c b/libavformat/img2.c
index 2af561c..e3e7d11 100644
--- a/libavformat/img2.c
+++ b/libavformat/img2.c
@@ -85,6 +85,7 @@ static const IdStrMap img_tags[] = {
     { CODEC_ID_JPEG2000  , "jpc"},
     { CODEC_ID_DPX       , "dpx"},
     { CODEC_ID_PICTOR    , "pic"},
+    { CODEC_ID_XWD       , "xwd"},
     { CODEC_ID_NONE      , NULL}
 };
 
@@ -501,7 +502,7 @@ AVOutputFormat ff_image2_muxer = {
     .name           = "image2",
     .long_name      = NULL_IF_CONFIG_SMALL("image2 sequence"),
     .extensions     = "bmp,dpx,jpeg,jpg,ljpg,pam,pbm,pcx,pgm,pgmyuv,png,"
-                      "ppm,sgi,tga,tif,tiff,jp2",
+                      "ppm,sgi,tga,tif,tiff,jp2,xwd",
     .priv_data_size = sizeof(VideoData),
     .video_codec    = CODEC_ID_MJPEG,
     .write_header   = write_header,



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