mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
69 lines
2.5 KiB
69 lines
2.5 KiB
/* |
|
* 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 */
|
|
|