PeerStreamer

/*

 * Audio and Video frame extraction

 * Copyright (c) 2003 Fabrice Bellard

 * Copyright (c) 2003 Michael Niedermayer

 *

 * 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 "parser.h"

#include "aac_ac3_parser.h"

#include "aacadtsdec.h"

#include "get_bits.h"

#include "mpeg4audio.h"

static int aac_sync(uint64_t state, AACAC3ParseContext *hdr_info,

        int *need_next_header, int *new_frame_start)

{

    GetBitContext bits;

    AACADTSHeaderInfo hdr;

    int size;

    union {

        uint64_t u64;

        uint8_t  u8[8];

    } tmp;

    tmp.u64 = av_be2ne64(state);

    init_get_bits(&bits, tmp.u8+8-AAC_ADTS_HEADER_SIZE, AAC_ADTS_HEADER_SIZE * 8);

    if ((size = ff_aac_parse_header(&bits, &hdr)) < 0)

        return 0;

    *need_next_header = 0;

    *new_frame_start  = 1;

    hdr_info->sample_rate = hdr.sample_rate;

    hdr_info->channels    = ff_mpeg4audio_channels[hdr.chan_config];

    hdr_info->samples     = hdr.samples;

    hdr_info->bit_rate    = hdr.bit_rate;

    return size;

}

static av_cold int aac_parse_init(AVCodecParserContext *s1)

{

    AACAC3ParseContext *s = s1->priv_data;

    s->header_size = AAC_ADTS_HEADER_SIZE;

    s->sync = aac_sync;

    return 0;

}

AVCodecParser ff_aac_parser = {

    { CODEC_ID_AAC },

    sizeof(AACAC3ParseContext),

    aac_parse_init,

    ff_aac_ac3_parse,

    ff_parse_close,

};