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/*

 * Microsoft Windows ICO muxer

 * Copyright (c) 2012 Michael Bradshaw 

 *

 * 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 == AV_CODEC_ID_BMP) {

        if (c->pix_fmt == AV_PIX_FMT_PAL8 && AV_PIX_FMT_RGB32 != AV_PIX_FMT_BGRA) {

            av_log(s, AV_LOG_ERROR, "Wrong endianness for bmp pixel format\n");

            return AVERROR(EINVAL);

        } else if (c->pix_fmt != AV_PIX_FMT_PAL8 &&

                   c->pix_fmt != AV_PIX_FMT_RGB555LE &&

                   c->pix_fmt != AV_PIX_FMT_BGR24 &&

                   c->pix_fmt != AV_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 == AV_CODEC_ID_PNG) {

        if (c->pix_fmt != AV_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 == AV_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)

    }

    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 == AV_CODEC_ID_BMP &&

            s->streams[i]->codec->pix_fmt == AV_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    = AV_CODEC_ID_NONE,

    .video_codec    = AV_CODEC_ID_BMP,

    .write_header   = ico_write_header,

    .write_packet   = ico_write_packet,

    .write_trailer  = ico_write_trailer,

    .flags          = AVFMT_NOTIMESTAMPS,

};