/*

 * 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

 * Sipr audio parser

 */

#include "parser.h"

typedef struct SiprParserContext{

    ParseContext pc;

} SiprParserContext;

static int sipr_split(AVCodecContext *avctx, const uint8_t *buf, int buf_size)

{

    int next;

    switch (avctx->block_align) {

    case 20:

    case 19:

    case 29:

    case 37: next = avctx->block_align; break;

    default:

        if      (avctx->bit_rate > 12200) next = 20;

        else if (avctx->bit_rate > 7500 ) next = 19;

        else if (avctx->bit_rate > 5750 ) next = 29;

        else                              next = 37;

    }

    return FFMIN(next, buf_size);

}

static int sipr_parse(AVCodecParserContext *s1, AVCodecContext *avctx,

                      const uint8_t **poutbuf, int *poutbuf_size,

                      const uint8_t *buf, int buf_size)

{

    SiprParserContext *s = s1->priv_data;

    ParseContext *pc = &s->pc;

    int next;

    next = sipr_split(avctx, buf, buf_size);

    if (ff_combine_frame(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_sipr_parser = {

    .codec_ids      = { AV_CODEC_ID_SIPR },

    .priv_data_size = sizeof(SiprParserContext),

    .parser_parse   = sipr_parse,

    .parser_close   = ff_parse_close,

};