/*

 * 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

 * AHX audio parser

 *

 * Splits packets into individual blocks.

 */

#include "libavutil/intreadwrite.h"

#include "parser.h"

#include "parser_internal.h"

typedef struct AHXParseContext {

    ParseContext pc;

    uint32_t header;

    int size;

} AHXParseContext;

static int ahx_parse(AVCodecParserContext *s1,

                     AVCodecContext *avctx,

                     const uint8_t **poutbuf, int *poutbuf_size,

                     const uint8_t *buf, int buf_size)

{

    AHXParseContext *s = s1->priv_data;

    ParseContext *pc = &s->pc;

    uint32_t state = pc->state;

    int next = END_NOT_FOUND;

    for (int i = 0; i < buf_size; i++) {

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

        s->size++;

        if (s->size == 4 && !s->header)

            s->header = state;

        if (s->size > 4 && state == s->header) {

            next = i - 3;

            s->size = 0;

            break;

        }

    }

    pc->state = state;

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

        *poutbuf      = NULL;

        *poutbuf_size = 0;

        return buf_size;

    }

    s1->duration = 1152;

    s1->key_frame = 1;

    *poutbuf = buf;

    *poutbuf_size = buf_size;

    return next;

}

const FFCodecParser ff_ahx_parser = {

    PARSER_CODEC_LIST(AV_CODEC_ID_AHX),

    .priv_data_size = sizeof(AHXParseContext),

    .parse          = ahx_parse,

    .close          = ff_parse_close,

};