| /* |
| * 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 */ |