/*
* 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 */
Messung V0.5 in Prozent C=83 H=79 G=80
¤ Dauer der Verarbeitung: 0.12 Sekunden
(vorverarbeitet am 2026-08-25)
¤
*© Formatika GbR, Deutschland