blob: d606494e1e58d7f9c1942d7a76937bf57f84ef87
| 1 | /* |
| 2 | * FLAC common code |
| 3 | * Copyright (c) 2009 Justin Ruggles |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | #include "flac.h" |
| 23 | |
| 24 | int ff_flac_get_max_frame_size(int blocksize, int ch, int bps) |
| 25 | { |
| 26 | /* Technically, there is no limit to FLAC frame size, but an encoder |
| 27 | should not write a frame that is larger than if verbatim encoding mode |
| 28 | were to be used. */ |
| 29 | |
| 30 | int count; |
| 31 | |
| 32 | count = 16; /* frame header */ |
| 33 | count += ch * ((7 + bps + 7) / 8); /* subframe headers */ |
| 34 | if (ch == 2) { |
| 35 | /* for stereo, need to account for using decorrelation */ |
| 36 | count += ((2 * bps + 1) * blocksize + 7) / 8; |
| 37 | } else { |
| 38 | count += (ch * bps * blocksize + 7) / 8; |
| 39 | } |
| 40 | count += 2; /* frame footer */ |
| 41 | |
| 42 | return count; |
| 43 | } |
| 44 |