/*

 * MPEG-4 Audio PCE copying function

 *

 * 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_MPEG4AUDIO_COPY_PCE_H

#define AVCODEC_MPEG4AUDIO_COPY_PCE_H

#include "libavutil/attributes.h"

#include "get_bits.h"

#include "put_bits.h"

static av_always_inline unsigned int ff_pce_copy_bits(PutBitContext *pb,

                                                      GetBitContext *gb,

                                                      int bits)

{

    unsigned int el = get_bits(gb, bits);

    put_bits(pb, bits, el);

    return el;

}

static inline int ff_copy_pce_data(PutBitContext *pb, GetBitContext *gb)

{

    int five_bit_ch, four_bit_ch, comment_size, bits;

    int offset = put_bits_count(pb);

    ff_pce_copy_bits(pb, gb, 10);               // Tag, Object Type, Frequency

    five_bit_ch  = ff_pce_copy_bits(pb, gb, 4); // Front

    five_bit_ch += ff_pce_copy_bits(pb, gb, 4); // Side

    five_bit_ch += ff_pce_copy_bits(pb, gb, 4); // Back

    four_bit_ch  = ff_pce_copy_bits(pb, gb, 2); // LFE

    four_bit_ch += ff_pce_copy_bits(pb, gb, 3); // Data

    five_bit_ch += ff_pce_copy_bits(pb, gb, 4); // Coupling

    if (ff_pce_copy_bits(pb, gb, 1))            // Mono Mixdown

        ff_pce_copy_bits(pb, gb, 4);

    if (ff_pce_copy_bits(pb, gb, 1))            // Stereo Mixdown

        ff_pce_copy_bits(pb, gb, 4);

    if (ff_pce_copy_bits(pb, gb, 1))            // Matrix Mixdown

        ff_pce_copy_bits(pb, gb, 3);

    for (bits = five_bit_ch*5+four_bit_ch*4; bits > 16; bits -= 16)

        ff_pce_copy_bits(pb, gb, 16);

    if (bits)

        ff_pce_copy_bits(pb, gb, bits);

    align_put_bits(pb);

    align_get_bits(gb);

    comment_size = ff_pce_copy_bits(pb, gb, 8);

    for (; comment_size > 0; comment_size--)

        ff_pce_copy_bits(pb, gb, 8);

    return put_bits_count(pb) - offset;

}

#endif /* AVCODEC_MPEG4AUDIO_COPY_PCE_H */