PeerStreamer

aac_decoder_select="mdct rdft"

OBJS-$(CONFIG_AAC_DECODER)             += aacdec.o aactab.o aacsbr.o aacps.o \

                                          aacadtsdec.o mpeg4audio.o

                                          aacadtsdec.o mpeg4audio.o

OBJS-$(CONFIG_AAC_ADTSTOASC_BSF)          += aac_adtstoasc_bsf.o aacadtsdec.o \

                                             mpeg4audio.o

#include "aacadtsdec.h"

#include "aacadtsdec.h"

/*

 * Audio and Video frame extraction

 * Copyright (c) 2003 Fabrice Bellard

 * Copyright (c) 2003 Michael Niedermayer

 * Copyright (c) 2009 Alex Converse

 *

 * 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 "aac_ac3_parser.h"

#include "aacadtsdec.h"

#include "get_bits.h"

#include "mpeg4audio.h"

int ff_aac_parse_header(GetBitContext *gbc, AACADTSHeaderInfo *hdr)

{

    int size, rdb, ch, sr;

    int aot, crc_abs;

    if(get_bits(gbc, 12) != 0xfff)

        return AAC_AC3_PARSE_ERROR_SYNC;

    skip_bits1(gbc);             /* id */

    skip_bits(gbc, 2);           /* layer */

    crc_abs = get_bits1(gbc);    /* protection_absent */

    aot     = get_bits(gbc, 2);  /* profile_objecttype */

    sr      = get_bits(gbc, 4);  /* sample_frequency_index */

    if(!ff_mpeg4audio_sample_rates[sr])

        return AAC_AC3_PARSE_ERROR_SAMPLE_RATE;

    skip_bits1(gbc);             /* private_bit */

    ch      = get_bits(gbc, 3);  /* channel_configuration */

    skip_bits1(gbc);             /* original/copy */

    skip_bits1(gbc);             /* home */

    /* adts_variable_header */

    skip_bits1(gbc);             /* copyright_identification_bit */

    skip_bits1(gbc);             /* copyright_identification_start */

    size    = get_bits(gbc, 13); /* aac_frame_length */

    if(size < AAC_ADTS_HEADER_SIZE)

        return AAC_AC3_PARSE_ERROR_FRAME_SIZE;

    skip_bits(gbc, 11);          /* adts_buffer_fullness */

    rdb = get_bits(gbc, 2);      /* number_of_raw_data_blocks_in_frame */

    hdr->object_type    = aot + 1;

    hdr->chan_config    = ch;

    hdr->crc_absent     = crc_abs;

    hdr->num_aac_frames = rdb + 1;

    hdr->sampling_index = sr;

    hdr->sample_rate    = ff_mpeg4audio_sample_rates[sr];

    hdr->samples        = (rdb + 1) * 1024;

    hdr->bit_rate       = size * 8 * hdr->sample_rate / hdr->samples;

    return size;

}

/*

 * AAC ADTS header decoding prototypes and structures

 * 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

 */

#ifndef AVCODEC_AACADTSDEC_H

#define AVCODEC_AACADTSDEC_H

#include <stdint.h>

#include "get_bits.h"

#define AAC_ADTS_HEADER_SIZE 7

typedef struct {

    uint32_t sample_rate;

    uint32_t samples;

    uint32_t bit_rate;

    uint8_t  crc_absent;

    uint8_t  object_type;

    uint8_t  sampling_index;

    uint8_t  chan_config;

    uint8_t  num_aac_frames;

} AACADTSHeaderInfo;

/**

 * Parse AAC frame header.

 * Parse the ADTS frame header to the end of the variable header, which is

 * the first 54 bits.

 * @param gbc BitContext containing the first 54 bits of the frame.

 * @param hdr Pointer to struct where header info is written.

 * @return Returns 0 on success, -1 if there is a sync word mismatch,

 * -2 if the version element is invalid, -3 if the sample rate

 * element is invalid, or -4 if the bit rate element is invalid.

 */

int ff_aac_parse_header(GetBitContext *gbc, AACADTSHeaderInfo *hdr);

#endif /* AVCODEC_AACADTSDEC_H */

#include "aacadtsdec.h"

#include "libavcodec/aacadtsdec.h"