yading@11: /*
yading@11:  * Microsoft Windows ICO muxer
yading@11:  * Copyright (c) 2012 Michael Bradshaw <mjbshaw gmail com>
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: /**
yading@11:  * @file
yading@11:  * Microsoft Windows ICO muxer
yading@11:  */
yading@11: 
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "libavutil/pixdesc.h"
yading@11: #include "avformat.h"
yading@11: 
yading@11: typedef struct {
yading@11:     int offset;
yading@11:     int size;
yading@11:     unsigned char width;
yading@11:     unsigned char height;
yading@11:     short bits;
yading@11: } IcoImage;
yading@11: 
yading@11: typedef struct {
yading@11:     int current_image;
yading@11:     int nb_images;
yading@11:     IcoImage *images;
yading@11: } IcoMuxContext;
yading@11: 
yading@11: static int ico_check_attributes(AVFormatContext *s, const AVCodecContext *c)
yading@11: {
yading@11:     if (c->codec_id == AV_CODEC_ID_BMP) {
yading@11:         if (c->pix_fmt == AV_PIX_FMT_PAL8 && AV_PIX_FMT_RGB32 != AV_PIX_FMT_BGRA) {
yading@11:             av_log(s, AV_LOG_ERROR, "Wrong endianness for bmp pixel format\n");
yading@11:             return AVERROR(EINVAL);
yading@11:         } else if (c->pix_fmt != AV_PIX_FMT_PAL8 &&
yading@11:                    c->pix_fmt != AV_PIX_FMT_RGB555LE &&
yading@11:                    c->pix_fmt != AV_PIX_FMT_BGR24 &&
yading@11:                    c->pix_fmt != AV_PIX_FMT_BGRA) {
yading@11:             av_log(s, AV_LOG_ERROR, "BMP must be 1bit, 4bit, 8bit, 16bit, 24bit, or 32bit\n");
yading@11:             return AVERROR(EINVAL);
yading@11:         }
yading@11:     } else if (c->codec_id == AV_CODEC_ID_PNG) {
yading@11:         if (c->pix_fmt != AV_PIX_FMT_RGBA) {
yading@11:             av_log(s, AV_LOG_ERROR, "PNG in ico requires pixel format to be rgba\n");
yading@11:             return AVERROR(EINVAL);
yading@11:         }
yading@11:     } else {
yading@11:         av_log(s, AV_LOG_ERROR, "Unsupported codec %s\n", c->codec_name);
yading@11:         return AVERROR(EINVAL);
yading@11:     }
yading@11: 
yading@11:     if (c->width > 256 ||
yading@11:         c->height > 256) {
yading@11:         av_log(s, AV_LOG_ERROR, "Unsupported dimensions %dx%d (dimensions cannot exceed 256x256)\n", c->width, c->height);
yading@11:         return AVERROR(EINVAL);
yading@11:     }
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int ico_write_header(AVFormatContext *s)
yading@11: {
yading@11:     IcoMuxContext *ico = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     int ret;
yading@11:     int i;
yading@11: 
yading@11:     if (!pb->seekable) {
yading@11:         av_log(s, AV_LOG_ERROR, "Output is not seekable\n");
yading@11:         return AVERROR(EINVAL);
yading@11:     }
yading@11: 
yading@11:     ico->current_image = 0;
yading@11:     ico->nb_images = s->nb_streams;
yading@11: 
yading@11:     avio_wl16(pb, 0); // reserved
yading@11:     avio_wl16(pb, 1); // 1 == icon
yading@11:     avio_skip(pb, 2); // skip the number of images
yading@11: 
yading@11:     for (i = 0; i < s->nb_streams; i++) {
yading@11:         if (ret = ico_check_attributes(s, s->streams[i]->codec))
yading@11:             return ret;
yading@11: 
yading@11:         // Fill in later when writing trailer...
yading@11:         avio_skip(pb, 16);
yading@11:     }
yading@11: 
yading@11:     ico->images = av_mallocz(ico->nb_images * sizeof(IcoMuxContext));
yading@11:     if (!ico->images)
yading@11:         return AVERROR(ENOMEM);
yading@11: 
yading@11:     avio_flush(pb);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int ico_write_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     IcoMuxContext *ico = s->priv_data;
yading@11:     IcoImage *image;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     AVCodecContext *c = s->streams[pkt->stream_index]->codec;
yading@11:     int i;
yading@11: 
yading@11:     if (ico->current_image >= ico->nb_images) {
yading@11:         av_log(s, AV_LOG_ERROR, "ICO already contains %d images\n", ico->current_image);
yading@11:         return AVERROR(EIO);
yading@11:     }
yading@11: 
yading@11:     image = &ico->images[ico->current_image++];
yading@11: 
yading@11:     image->offset = avio_tell(pb);
yading@11:     image->width = (c->width == 256) ? 0 : c->width;
yading@11:     image->height = (c->height == 256) ? 0 : c->height;
yading@11: 
yading@11:     if (c->codec_id == AV_CODEC_ID_PNG) {
yading@11:         image->bits = c->bits_per_coded_sample;
yading@11:         image->size = pkt->size;
yading@11: 
yading@11:         avio_write(pb, pkt->data, pkt->size);
yading@11:     } else { // BMP
yading@11:         if (AV_RL32(pkt->data + 14) != 40) { // must be BITMAPINFOHEADER
yading@11:             av_log(s, AV_LOG_ERROR, "Invalid BMP\n");
yading@11:             return AVERROR(EINVAL);
yading@11:         }
yading@11: 
yading@11:         image->bits = AV_RL16(pkt->data + 28); // allows things like 1bit and 4bit images to be preserved
yading@11:         image->size = pkt->size - 14 + c->height * (c->width + 7) / 8;
yading@11: 
yading@11:         avio_write(pb, pkt->data + 14, 8); // Skip the BITMAPFILEHEADER header
yading@11:         avio_wl32(pb, AV_RL32(pkt->data + 22) * 2); // rewrite height as 2 * height
yading@11:         avio_write(pb, pkt->data + 26, pkt->size - 26);
yading@11: 
yading@11:         for (i = 0; i < c->height * (c->width + 7) / 8; ++i)
yading@11:             avio_w8(pb, 0x00); // Write bitmask (opaque)
yading@11:     }
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int ico_write_trailer(AVFormatContext *s)
yading@11: {
yading@11:     IcoMuxContext *ico = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     int i;
yading@11: 
yading@11:     avio_seek(pb, 4, SEEK_SET);
yading@11: 
yading@11:     avio_wl16(pb, ico->current_image);
yading@11: 
yading@11:     for (i = 0; i < ico->nb_images; i++) {
yading@11:         avio_w8(pb, ico->images[i].width);
yading@11:         avio_w8(pb, ico->images[i].height);
yading@11: 
yading@11:         if (s->streams[i]->codec->codec_id == AV_CODEC_ID_BMP &&
yading@11:             s->streams[i]->codec->pix_fmt == AV_PIX_FMT_PAL8) {
yading@11:             avio_w8(pb, (ico->images[i].bits >= 8) ? 0 : 1 << ico->images[i].bits);
yading@11:         } else {
yading@11:             avio_w8(pb, 0);
yading@11:         }
yading@11: 
yading@11:         avio_w8(pb, 0); // reserved
yading@11:         avio_wl16(pb, 1); // color planes
yading@11:         avio_wl16(pb, ico->images[i].bits);
yading@11:         avio_wl32(pb, ico->images[i].size);
yading@11:         avio_wl32(pb, ico->images[i].offset);
yading@11:     }
yading@11: 
yading@11:     av_freep(&ico->images);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVOutputFormat ff_ico_muxer = {
yading@11:     .name           = "ico",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("Microsoft Windows ICO"),
yading@11:     .priv_data_size = sizeof(IcoMuxContext),
yading@11:     .mime_type      = "image/vnd.microsoft.icon",
yading@11:     .extensions     = "ico",
yading@11:     .audio_codec    = AV_CODEC_ID_NONE,
yading@11:     .video_codec    = AV_CODEC_ID_BMP,
yading@11:     .write_header   = ico_write_header,
yading@11:     .write_packet   = ico_write_packet,
yading@11:     .write_trailer  = ico_write_trailer,
yading@11:     .flags          = AVFMT_NOTIMESTAMPS,
yading@11: };