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/*

 * Binary text demuxer

 * eXtended BINary text (XBIN) demuxer

 * Artworx Data Format demuxer

 * iCEDraw File demuxer

 * Copyright (c) 2010 Peter Ross 

 *

 * 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

 * Binary text demuxer

 * eXtended BINary text (XBIN) demuxer

 * Artworx Data Format demuxer

 * iCEDraw File demuxer

 */

#include "libavutil/intreadwrite.h"

#include "libavutil/opt.h"

#include "libavutil/parseutils.h"

#include "avformat.h"

#include "internal.h"

#include "sauce.h"

#include "libavcodec/bintext.h"

typedef struct {

    const AVClass *class;

    int chars_per_frame; /**< characters to send decoder per frame;

                              set by private options as characters per second, and then

                              converted to characters per frame at runtime */

    int width, height;    /**< video size (WxH pixels) (private option) */

    AVRational framerate; /**< frames per second (private option) */

    uint64_t fsize;  /**< file size less metadata buffer */

} BinDemuxContext;

static AVStream * init_stream(AVFormatContext *s)

{

    BinDemuxContext *bin = s->priv_data;

    AVStream *st = avformat_new_stream(s, NULL);

    if (!st)

        return NULL;

    st->codec->codec_tag   = 0;

    st->codec->codec_type  = AVMEDIA_TYPE_VIDEO;

    if (!bin->width) {

        st->codec->width  = (80<<3);

        st->codec->height = (25<<4);

    }

    avpriv_set_pts_info(st, 60, bin->framerate.den, bin->framerate.num);

    /* simulate tty display speed */

    bin->chars_per_frame = av_clip(av_q2d(st->time_base) * bin->chars_per_frame, 1, INT_MAX);

    return st;

}

#if CONFIG_BINTEXT_DEMUXER | CONFIG_ADF_DEMUXER | CONFIG_IDF_DEMUXER

/**

 * Given filesize and width, calculate height (assume font_height of 16)

 */

static void calculate_height(AVCodecContext *avctx, uint64_t fsize)

{

    avctx->height = (fsize / ((avctx->width>>3)*2)) << 4;

}

#endif

#if CONFIG_BINTEXT_DEMUXER

static const uint8_t next_magic[]={

    0x1A, 0x1B, '[', '0', ';', '3', '0', ';', '4', '0', 'm', 'N', 'E', 'X', 'T', 0x00

};

static int next_tag_read(AVFormatContext *avctx, uint64_t *fsize)

{

    AVIOContext *pb = avctx->pb;

    char buf[36];

    int len;

    uint64_t start_pos = avio_size(pb) - 256;

    avio_seek(pb, start_pos, SEEK_SET);

    if (avio_read(pb, buf, sizeof(next_magic)) != sizeof(next_magic))

        return -1;

    if (memcmp(buf, next_magic, sizeof(next_magic)))

        return -1;

    if (avio_r8(pb) != 0x01)

        return -1;

    *fsize -= 256;

#define GET_EFI2_META(name,size) \

    len = avio_r8(pb); \

    if (len < 1 || len > size) \

        return -1; \

    if (avio_read(pb, buf, size) == size && *buf) { \

        buf[len] = 0; \

        av_dict_set(&avctx->metadata, name, buf, 0); \

    }

    GET_EFI2_META("filename",  12)

    GET_EFI2_META("author",    20)

    GET_EFI2_META("publisher", 20)

    GET_EFI2_META("title",     35)

    return 0;

}

static void predict_width(AVCodecContext *avctx, uint64_t fsize, int got_width)

{

    /** attempt to guess width */

    if (!got_width)

        avctx->width = fsize > 4000 ? (160<<3) : (80<<3);

}

static int bintext_read_header(AVFormatContext *s)

{

    BinDemuxContext *bin = s->priv_data;

    AVIOContext *pb = s->pb;

    AVStream *st = init_stream(s);

    if (!st)

        return AVERROR(ENOMEM);

    st->codec->codec_id    = AV_CODEC_ID_BINTEXT;

    if (ff_alloc_extradata(st->codec, 2))

        return AVERROR(ENOMEM);

    st->codec->extradata[0] = 16;

    st->codec->extradata[1] = 0;

    if (pb->seekable) {

        int got_width = 0;

        bin->fsize = avio_size(pb);

        if (ff_sauce_read(s, &bin->fsize, &got_width, 0) < 0)

            next_tag_read(s, &bin->fsize);

        if (!bin->width) {

            predict_width(st->codec, bin->fsize, got_width);

            calculate_height(st->codec, bin->fsize);

        }

        avio_seek(pb, 0, SEEK_SET);

    }

    return 0;

}

#endif /* CONFIG_BINTEXT_DEMUXER */

#if CONFIG_XBIN_DEMUXER

static int xbin_probe(AVProbeData *p)

{

    const uint8_t *d = p->buf;

    if (AV_RL32(d) == MKTAG('X','B','I','N') && d[4] == 0x1A &&

        AV_RL16(d+5) > 0 && AV_RL16(d+5) <= 160 &&

        d[9] > 0 && d[9] <= 32)

        return AVPROBE_SCORE_MAX;

    return 0;

}

static int xbin_read_header(AVFormatContext *s)

{

    BinDemuxContext *bin = s->priv_data;

    AVIOContext *pb = s->pb;

    char fontheight, flags;

    AVStream *st = init_stream(s);

    if (!st)

        return AVERROR(ENOMEM);

    avio_skip(pb, 5);

    st->codec->width   = avio_rl16(pb)<<3;

    st->codec->height  = avio_rl16(pb);

    fontheight         = avio_r8(pb);

    st->codec->height *= fontheight;

    flags              = avio_r8(pb);

    st->codec->extradata_size = 2;

    if ((flags & BINTEXT_PALETTE))

        st->codec->extradata_size += 48;

    if ((flags & BINTEXT_FONT))

        st->codec->extradata_size += fontheight * (flags & 0x10 ? 512 : 256);

    st->codec->codec_id    = flags & 4 ? AV_CODEC_ID_XBIN : AV_CODEC_ID_BINTEXT;

    if (ff_alloc_extradata(st->codec, st->codec->extradata_size))

        return AVERROR(ENOMEM);

    st->codec->extradata[0] = fontheight;

    st->codec->extradata[1] = flags;

    if (avio_read(pb, st->codec->extradata + 2, st->codec->extradata_size - 2) < 0)

        return AVERROR(EIO);

    if (pb->seekable) {

        bin->fsize = avio_size(pb) - 9 - st->codec->extradata_size;

        ff_sauce_read(s, &bin->fsize, NULL, 0);

        avio_seek(pb, 9 + st->codec->extradata_size, SEEK_SET);

    }

    return 0;

}

#endif /* CONFIG_XBIN_DEMUXER */

#if CONFIG_ADF_DEMUXER

static int adf_read_header(AVFormatContext *s)

{

    BinDemuxContext *bin = s->priv_data;

    AVIOContext *pb = s->pb;

    AVStream *st;

    if (avio_r8(pb) != 1)

        return AVERROR_INVALIDDATA;

    st = init_stream(s);

    if (!st)

        return AVERROR(ENOMEM);

    st->codec->codec_id    = AV_CODEC_ID_BINTEXT;

    if (ff_alloc_extradata(st->codec, 2 + 48 + 4096))

        return AVERROR(ENOMEM);

    st->codec->extradata[0] = 16;

    st->codec->extradata[1] = BINTEXT_PALETTE|BINTEXT_FONT;

    if (avio_read(pb, st->codec->extradata + 2, 24) < 0)

        return AVERROR(EIO);

    avio_skip(pb, 144);

    if (avio_read(pb, st->codec->extradata + 2 + 24, 24) < 0)

        return AVERROR(EIO);

    if (avio_read(pb, st->codec->extradata + 2 + 48, 4096) < 0)

        return AVERROR(EIO);

    if (pb->seekable) {

        int got_width = 0;

        bin->fsize = avio_size(pb) - 1 - 192 - 4096;

        st->codec->width = 80<<3;

        ff_sauce_read(s, &bin->fsize, &got_width, 0);

        if (!bin->width)

            calculate_height(st->codec, bin->fsize);

        avio_seek(pb, 1 + 192 + 4096, SEEK_SET);

    }

    return 0;

}

#endif /* CONFIG_ADF_DEMUXER */

#if CONFIG_IDF_DEMUXER

static const uint8_t idf_magic[] = {

    0x04, 0x31, 0x2e, 0x34, 0x00, 0x00, 0x00, 0x00, 0x4f, 0x00, 0x15, 0x00

};

static int idf_probe(AVProbeData *p)

{

    if (p->buf_size < sizeof(idf_magic))

        return 0;

    if (!memcmp(p->buf, idf_magic, sizeof(idf_magic)))

        return AVPROBE_SCORE_MAX;

    return 0;

}

static int idf_read_header(AVFormatContext *s)

{

    BinDemuxContext *bin = s->priv_data;

    AVIOContext *pb = s->pb;

    AVStream *st;

    int got_width = 0;

    if (!pb->seekable)

        return AVERROR(EIO);

    st = init_stream(s);

    if (!st)

        return AVERROR(ENOMEM);

    st->codec->codec_id    = AV_CODEC_ID_IDF;

    if (ff_alloc_extradata(st->codec, 2 + 48 + 4096))

        return AVERROR(ENOMEM);

    st->codec->extradata[0] = 16;

    st->codec->extradata[1] = BINTEXT_PALETTE|BINTEXT_FONT;

    avio_seek(pb, avio_size(pb) - 4096 - 48, SEEK_SET);

    if (avio_read(pb, st->codec->extradata + 2 + 48, 4096) < 0)

        return AVERROR(EIO);

    if (avio_read(pb, st->codec->extradata + 2, 48) < 0)

        return AVERROR(EIO);

    bin->fsize = avio_size(pb) - 12 - 4096 - 48;

    ff_sauce_read(s, &bin->fsize, &got_width, 0);

    if (!bin->width)

        calculate_height(st->codec, bin->fsize);

    avio_seek(pb, 12, SEEK_SET);

    return 0;

}

#endif /* CONFIG_IDF_DEMUXER */

static int read_packet(AVFormatContext *s,

                           AVPacket *pkt)

{

    BinDemuxContext *bin = s->priv_data;

    if (bin->fsize > 0) {

        if (av_get_packet(s->pb, pkt, bin->fsize) < 0)

            return AVERROR(EIO);

        bin->fsize = -1; /* done */

    } else if (!bin->fsize) {

        if (url_feof(s->pb))

            return AVERROR(EIO);

        if (av_get_packet(s->pb, pkt, bin->chars_per_frame) < 0)

            return AVERROR(EIO);

    } else {

        return AVERROR(EIO);

    }

    pkt->flags |= AV_PKT_FLAG_KEY;

    return 0;

}

#define OFFSET(x) offsetof(BinDemuxContext, x)

static const AVOption options[] = {

    { "linespeed", "set simulated line speed (bytes per second)", OFFSET(chars_per_frame), AV_OPT_TYPE_INT, {.i64 = 6000}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM},

    { "video_size", "set video size, such as 640x480 or hd720.", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, AV_OPT_FLAG_DECODING_PARAM },

    { "framerate", "set framerate (frames per second)", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, AV_OPT_FLAG_DECODING_PARAM },

    { NULL },

};

#define CLASS(name) \

(const AVClass[1]){{ \

    .class_name     = name, \

    .item_name      = av_default_item_name, \

    .option         = options, \

    .version        = LIBAVUTIL_VERSION_INT, \

}}

#if CONFIG_BINTEXT_DEMUXER

AVInputFormat ff_bintext_demuxer = {

    .name           = "bin",

    .long_name      = NULL_IF_CONFIG_SMALL("Binary text"),

    .priv_data_size = sizeof(BinDemuxContext),

    .read_header    = bintext_read_header,

    .read_packet    = read_packet,

    .extensions     = "bin",

    .priv_class     = CLASS("Binary text demuxer"),

};

#endif

#if CONFIG_XBIN_DEMUXER

AVInputFormat ff_xbin_demuxer = {

    .name           = "xbin",

    .long_name      = NULL_IF_CONFIG_SMALL("eXtended BINary text (XBIN)"),

    .priv_data_size = sizeof(BinDemuxContext),

    .read_probe     = xbin_probe,

    .read_header    = xbin_read_header,

    .read_packet    = read_packet,

    .priv_class     = CLASS("eXtended BINary text (XBIN) demuxer"),

};

#endif

#if CONFIG_ADF_DEMUXER

AVInputFormat ff_adf_demuxer = {

    .name           = "adf",

    .long_name      = NULL_IF_CONFIG_SMALL("Artworx Data Format"),

    .priv_data_size = sizeof(BinDemuxContext),

    .read_header    = adf_read_header,

    .read_packet    = read_packet,

    .extensions     = "adf",

    .priv_class     = CLASS("Artworx Data Format demuxer"),

};

#endif

#if CONFIG_IDF_DEMUXER

AVInputFormat ff_idf_demuxer = {

    .name           = "idf",

    .long_name      = NULL_IF_CONFIG_SMALL("iCE Draw File"),

    .priv_data_size = sizeof(BinDemuxContext),

    .read_probe     = idf_probe,

    .read_header    = idf_read_header,

    .read_packet    = read_packet,

    .extensions     = "idf",

    .priv_class     = CLASS("iCE Draw File demuxer"),

};

#endif