--- /dev/null
+/*
+ * Microsoft Windows ICO muxer
+ * Copyright (c) 2012 Michael Bradshaw <mbradshaw@sorensonmedia.com>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * Microsoft Windows ICO muxer
+ */
+
+#include "libavutil/intreadwrite.h"
+#include "libavutil/pixdesc.h"
+#include "avformat.h"
+
+typedef struct {
+ int offset;
+ int size;
+ unsigned char width;
+ unsigned char height;
+ short bits;
+} IcoImage;
+
+typedef struct {
+ int current_image;
+ int nb_images;
+ IcoImage *images;
+} IcoMuxContext;
+
+static int ico_check_attributes(AVFormatContext *s, const AVCodecContext *c)
+{
+ if (c->codec_id == CODEC_ID_BMP) {
+ if (c->pix_fmt == PIX_FMT_PAL8 && PIX_FMT_RGB32 != PIX_FMT_BGRA) {
+ av_log(s, AV_LOG_ERROR, "Wrong endianness for bmp pixel format\n");
+ return AVERROR(EINVAL);
+ } else if (c->pix_fmt != PIX_FMT_PAL8 &&
+ c->pix_fmt != PIX_FMT_RGB555LE &&
+ c->pix_fmt != PIX_FMT_BGR24 &&
+ c->pix_fmt != PIX_FMT_BGRA) {
+ av_log(s, AV_LOG_ERROR, "BMP must be 1bit, 4bit, 8bit, 16bit, 24bit, or 32bit\n");
+ return AVERROR(EINVAL);
+ }
+ } else if (c->codec_id == CODEC_ID_PNG) {
+ if (c->pix_fmt != PIX_FMT_RGBA) {
+ av_log(s, AV_LOG_ERROR, "PNG in ico requires pixel format to be rgba\n");
+ return AVERROR(EINVAL);
+ }
+ } else {
+ av_log(s, AV_LOG_ERROR, "Unsupported codec %s\n", c->codec_name);
+ return AVERROR(EINVAL);
+ }
+
+ if (c->width > 256 ||
+ c->height > 256) {
+ av_log(s, AV_LOG_ERROR, "Unsupported dimensions %dx%d (dimensions cannot exceed 256x256)\n", c->width, c->height);
+ return AVERROR(EINVAL);
+ }
+
+ return 0;
+}
+
+static int ico_write_header(AVFormatContext *s)
+{
+ IcoMuxContext *ico = s->priv_data;
+ AVIOContext *pb = s->pb;
+ int ret;
+ int i;
+
+ if (!pb->seekable) {
+ av_log(s, AV_LOG_ERROR, "Output is not seekable\n");
+ return AVERROR(EINVAL);
+ }
+
+ ico->current_image = 0;
+ ico->nb_images = s->nb_streams;
+
+ avio_wl16(pb, 0); // reserved
+ avio_wl16(pb, 1); // 1 == icon
+ avio_skip(pb, 2); // skip the number of images
+
+ for (i = 0; i < s->nb_streams; i++) {
+ if (ret = ico_check_attributes(s, s->streams[i]->codec))
+ return ret;
+
+ // Fill in later when writing trailer...
+ avio_skip(pb, 16);
+ }
+
+ ico->images = av_mallocz(ico->nb_images * sizeof(IcoMuxContext));
+ if (!ico->images)
+ return AVERROR(ENOMEM);
+
+ avio_flush(pb);
+
+ return 0;
+}
+
+static int ico_write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ IcoMuxContext *ico = s->priv_data;
+ IcoImage *image;
+ AVIOContext *pb = s->pb;
+ AVCodecContext *c = s->streams[pkt->stream_index]->codec;
+ int i;
+
+ if (ico->current_image >= ico->nb_images) {
+ av_log(s, AV_LOG_ERROR, "ICO already contains %d images\n", ico->current_image);
+ return AVERROR(EIO);
+ }
+
+ image = &ico->images[ico->current_image++];
+
+ image->offset = avio_tell(pb);
+ image->width = (c->width == 256) ? 0 : c->width;
+ image->height = (c->height == 256) ? 0 : c->height;
+
+ if (c->codec_id == CODEC_ID_PNG) {
+ image->bits = c->bits_per_coded_sample;
+ image->size = pkt->size;
+
+ avio_write(pb, pkt->data, pkt->size);
+ } else { // BMP
+ if (AV_RL32(pkt->data + 14) != 40) { // must be BITMAPINFOHEADER
+ av_log(s, AV_LOG_ERROR, "Invalid BMP\n");
+ return AVERROR(EINVAL);
+ }
+
+ image->bits = AV_RL16(pkt->data + 28); // allows things like 1bit and 4bit images to be preserved
+ image->size = pkt->size - 14 + c->height * (c->width + 7) / 8;
+
+ avio_write(pb, pkt->data + 14, 8); // Skip the BITMAPFILEHEADER header
+ avio_wl32(pb, AV_RL32(pkt->data + 22) * 2); // rewrite height as 2 * height
+ avio_write(pb, pkt->data + 26, pkt->size - 26);
+
+ for (i = 0; i < c->height * (c->width + 7) / 8; ++i)
+ avio_w8(pb, 0x00); // Write bitmask (opaque)
+ }
+
+ avio_flush(pb);
+
+ return 0;
+}
+
+static int ico_write_trailer(AVFormatContext *s)
+{
+ IcoMuxContext *ico = s->priv_data;
+ AVIOContext *pb = s->pb;
+ int i;
+
+ avio_seek(pb, 4, SEEK_SET);
+
+ avio_wl16(pb, ico->current_image);
+
+ for (i = 0; i < ico->nb_images; i++) {
+ avio_w8(pb, ico->images[i].width);
+ avio_w8(pb, ico->images[i].height);
+
+ if (s->streams[i]->codec->codec_id == CODEC_ID_BMP &&
+ s->streams[i]->codec->pix_fmt == PIX_FMT_PAL8) {
+ avio_w8(pb, (ico->images[i].bits >= 8) ? 0 : 1 << ico->images[i].bits);
+ } else {
+ avio_w8(pb, 0);
+ }
+
+ avio_w8(pb, 0); // reserved
+ avio_wl16(pb, 1); // color planes
+ avio_wl16(pb, ico->images[i].bits);
+ avio_wl32(pb, ico->images[i].size);
+ avio_wl32(pb, ico->images[i].offset);
+ }
+
+ av_freep(&ico->images);
+
+ return 0;
+}
+
+AVOutputFormat ff_ico_muxer = {
+ .name = "ico",
+ .long_name = NULL_IF_CONFIG_SMALL("Microsoft Windows ICO"),
+ .priv_data_size = sizeof(IcoMuxContext),
+ .mime_type = "image/vnd.microsoft.icon",
+ .extensions = "ico",
+ .audio_codec = CODEC_ID_NONE,
+ .video_codec = CODEC_ID_BMP,
+ .write_header = ico_write_header,
+ .write_packet = ico_write_packet,
+ .write_trailer = ico_write_trailer,
+ .flags = AVFMT_NOTIMESTAMPS,
+};