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70 lines
2.5 KiB
70 lines
2.5 KiB
2 years ago
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/*
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* MPEG-4 Audio PCE copying function
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_MPEG4AUDIO_COPY_PCE_H
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#define AVCODEC_MPEG4AUDIO_COPY_PCE_H
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#include "libavutil/attributes.h"
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#include "get_bits.h"
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#include "put_bits.h"
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static av_always_inline unsigned int ff_pce_copy_bits(PutBitContext *pb,
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GetBitContext *gb,
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int bits)
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{
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unsigned int el = get_bits(gb, bits);
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put_bits(pb, bits, el);
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return el;
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}
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static inline int ff_copy_pce_data(PutBitContext *pb, GetBitContext *gb)
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{
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int five_bit_ch, four_bit_ch, comment_size, bits;
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int offset = put_bits_count(pb);
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ff_pce_copy_bits(pb, gb, 10); // Tag, Object Type, Frequency
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five_bit_ch = ff_pce_copy_bits(pb, gb, 4); // Front
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five_bit_ch += ff_pce_copy_bits(pb, gb, 4); // Side
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five_bit_ch += ff_pce_copy_bits(pb, gb, 4); // Back
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four_bit_ch = ff_pce_copy_bits(pb, gb, 2); // LFE
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four_bit_ch += ff_pce_copy_bits(pb, gb, 3); // Data
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five_bit_ch += ff_pce_copy_bits(pb, gb, 4); // Coupling
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if (ff_pce_copy_bits(pb, gb, 1)) // Mono Mixdown
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ff_pce_copy_bits(pb, gb, 4);
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if (ff_pce_copy_bits(pb, gb, 1)) // Stereo Mixdown
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ff_pce_copy_bits(pb, gb, 4);
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if (ff_pce_copy_bits(pb, gb, 1)) // Matrix Mixdown
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ff_pce_copy_bits(pb, gb, 3);
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for (bits = five_bit_ch*5+four_bit_ch*4; bits > 16; bits -= 16)
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ff_pce_copy_bits(pb, gb, 16);
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if (bits)
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ff_pce_copy_bits(pb, gb, bits);
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align_put_bits(pb);
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align_get_bits(gb);
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comment_size = ff_pce_copy_bits(pb, gb, 8);
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for (; comment_size > 0; comment_size--)
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ff_pce_copy_bits(pb, gb, 8);
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return put_bits_count(pb) - offset;
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}
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#endif /* AVCODEC_MPEG4AUDIO_COPY_PCE_H */
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