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 24int 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