/*

 * 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 "decode.h"

#include "thread.h"

static unsigned int getv(GetByteContext * gb)

{

    int i;

    unsigned int v = 0;

    do {

        i = bytestream2_get_byte(gb);

        v = (v << 7) | (i & 0x7F);

    } while (i & 0x80);

    return v;

}

static void readbits(uint8_t * dst, int width, int height, int linesize, const uint8_t * src, int size)

{

    int wpad = (width + 7) / 8;

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

        memcpy(dst, src, FFMIN(wpad, size));

        src += wpad;

        size -= wpad;

        dst += linesize;

    }

}

static int wbmp_decode_frame(AVCodecContext *avctx, AVFrame *p,

                            int *got_frame, AVPacket *avpkt)

{

    const uint8_t *buf = avpkt->data;

    int buf_size = avpkt->size, width, height, ret;

    GetByteContext gb;

    bytestream2_init(&gb, buf, buf_size);

    if (getv(&gb))

        return AVERROR_INVALIDDATA;

    bytestream2_skip(&gb, 1);

    width = getv(&gb);

    height = getv(&gb);

    if ((ret = ff_set_dimensions(avctx, width, height)) < 0)

        return ret;

    avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;

    if ((ret = ff_thread_get_buffer(avctx, p, 0)) < 0)

        return ret;

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

        bytestream2_get_buffer(&gb, p->data[0], height * ((width + 7) / 8));

    else

        readbits(p->data[0], width, height, p->linesize[0],

                 gb.buffer, bytestream2_get_bytes_left(&gb));

    *got_frame   = 1;

    return buf_size;

}

const FFCodec ff_wbmp_decoder = {

    .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,

    FF_CODEC_DECODE_CB(wbmp_decode_frame),

};