/*

 * WBMP (Wireless Application Protocol Bitmap) image

 *

 * 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 "bytestream.h"

#include "codec_internal.h"

#include "encode.h"

static void putv(uint8_t ** bufp, unsigned int v)

{

    unsigned int vv = 0;

    int n = 0;

    while (vv != v)

        vv += v & (0x7F << 7 * n++);

    while (--n > 0)

        bytestream_put_byte(bufp, 0x80 | (v & (0x7F << 7 * n)) >> 7 * n);

    bytestream_put_byte(bufp, v & 0x7F);

}

static void writebits(uint8_t ** bufp, const uint8_t * src, int width, int height, int linesize)

{

    int wpad = (width + 7) / 8;

    for (int j = 0; j < height; j++) {

        memcpy(*bufp, src, wpad);

        *bufp += wpad;

        src += linesize;

    }

}

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

                            const AVFrame *frame, int *got_packet)

{

    int64_t size = avctx->height * ((avctx->width + 7) / 8) + 32;

    uint8_t *buf;

    int ret;

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

        return ret;

    buf = pkt->data;

    putv(&buf, 0);

    bytestream_put_byte(&buf, 0);

    putv(&buf, avctx->width);

    putv(&buf, avctx->height);

    if (frame->linesize[0] == (avctx->width + 7) / 8)

        bytestream_put_buffer(&buf, frame->data[0], avctx->height * ((avctx->width + 7) / 8));

    else

        writebits(&buf, frame->data[0], avctx->width, avctx->height, frame->linesize[0]);

    av_shrink_packet(pkt, buf - pkt->data);

    *got_packet = 1;

    return 0;

}

const FFCodec ff_wbmp_encoder = {

    .p.name         = "wbmp",

    CODEC_LONG_NAME("WBMP (Wireless Application Protocol Bitmap) image"),

    .p.type         = AVMEDIA_TYPE_VIDEO,

    .p.id           = AV_CODEC_ID_WBMP,

    .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS |

                      AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,

    FF_CODEC_ENCODE_CB(wbmp_encode_frame),

    CODEC_PIXFMTS(AV_PIX_FMT_MONOBLACK),

};