/*

 * QOI parser

 * Copyright (c) 2022 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

 */

/**

 * @file

 * QOI parser

 */

#include "parser.h"

typedef struct QOIParseContext {

    ParseContext pc;

} QOIParseContext;

static int qoi_parse(AVCodecParserContext *s, AVCodecContext *avctx,

                     const uint8_t **poutbuf, int *poutbuf_size,

                     const uint8_t *buf, int buf_size)

{

    QOIParseContext *ipc = s->priv_data;

    uint64_t state = ipc->pc.state64;

    int next = END_NOT_FOUND, i = 0;

    s->pict_type = AV_PICTURE_TYPE_NONE;

    s->duration  = 1;

    *poutbuf_size = 0;

    *poutbuf = NULL;

    if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {

        next = buf_size;

    } else {

        for (; i < buf_size; i++) {

            state = (state << 8) | buf[i];

            if (state == 0x01LL) {

                next = i + 1;

                break;

            }

        }

        ipc->pc.state64 = state;

        if (ff_combine_frame(&ipc->pc, next, &buf, &buf_size) < 0) {

            *poutbuf = NULL;

            *poutbuf_size = 0;

            return buf_size;

        }

    }

    *poutbuf      = buf;

    *poutbuf_size = buf_size;

    return next;

}

const AVCodecParser ff_qoi_parser = {

    .codec_ids      = { AV_CODEC_ID_QOI },

    .priv_data_size = sizeof(QOIParseContext),

    .parser_parse   = qoi_parse,

    .parser_close   = ff_parse_close,

};