/*

 * XBM image format

 *

 * Copyright (c) 2012 Paul B Mahol

 *

 * 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

 */

#include "avcodec.h"

#include "codec_internal.h"

#include "encode.h"

#define ANSI_MIN_READLINE 509

static int xbm_encode_frame(AVCodecContext *avctx, AVPacket *pkt,

                            const AVFrame *p, int *got_packet)

{

    int i, j, l, commas, ret, size, linesize, lineout, rowsout;

    const uint8_t *ptr;

    uint8_t *buf;

    linesize = lineout = (avctx->width + 7) / 8;

    commas   = avctx->height * linesize;

    /* ANSI worst case minimum readline is 509 chars. */

    rowsout  = avctx->height;

    if (lineout > (ANSI_MIN_READLINE / 6)) {

        lineout = ANSI_MIN_READLINE / 6;

        rowsout = (commas + lineout - 1) / lineout;

    }

    size     = rowsout * (lineout * 6 + 1) + 106;

    if ((ret = ff_alloc_packet(avctx, pkt, size)) < 0)

        return ret;

    buf = pkt->data;

    ptr = p->data[0];

    buf += snprintf(buf, 32, "#define image_width %u\n", avctx->width);

    buf += snprintf(buf, 33, "#define image_height %u\n", avctx->height);

    buf += snprintf(buf, 39, "static unsigned char image_bits[] = {\n");

    for (i = 0, l = lineout; i < avctx->height; i++) {

        for (j = 0; j < linesize; j++) {

            // 0..15 bitreversed as chars

            static const char lut[] = {

                '0', '8', '4', 'C', '2', 'A', '6', 'E',

                '1', '9', '5', 'D', '3', 'B', '7', 'F'

            };

            buf[0] = ' ';

            buf[1] = '0';

            buf[2] = 'x';

            buf[3] = lut[*ptr & 0xF];

            buf[4] = lut[*ptr >> 4];

            buf += 5;

            ptr++;

            if (--commas <= 0) {

                *buf++ = '\n';

                break;

            }

            *buf++ = ',';

            if (--l <= 0) {

                *buf++ = '\n';

                l = lineout;

            }

        }

        ptr += p->linesize[0] - linesize;

    }

    buf += snprintf(buf, 5, " };\n");

    pkt->size   = buf - pkt->data;

    *got_packet = 1;

    return 0;

}

const FFCodec ff_xbm_encoder = {

    .p.name       = "xbm",

    CODEC_LONG_NAME("XBM (X BitMap) image"),

    .p.type       = AVMEDIA_TYPE_VIDEO,

    .p.id         = AV_CODEC_ID_XBM,

    .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,

    FF_CODEC_ENCODE_CB(xbm_encode_frame),

    CODEC_PIXFMTS(AV_PIX_FMT_MONOWHITE),

};