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diff --git a/audio_codec/libflac/flac.c b/audio_codec/libflac/flac.c new file mode 100644 index 0000000..d606494 --- a/dev/null +++ b/audio_codec/libflac/flac.c @@ -0,0 +1,43 @@ +/* + * FLAC common code + * Copyright (c) 2009 Justin Ruggles + * + * 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 + */ + +#include "flac.h" + +int ff_flac_get_max_frame_size(int blocksize, int ch, int bps) +{ + /* Technically, there is no limit to FLAC frame size, but an encoder + should not write a frame that is larger than if verbatim encoding mode + were to be used. */ + + int count; + + count = 16; /* frame header */ + count += ch * ((7 + bps + 7) / 8); /* subframe headers */ + if (ch == 2) { + /* for stereo, need to account for using decorrelation */ + count += ((2 * bps + 1) * blocksize + 7) / 8; + } else { + count += (ch * bps * blocksize + 7) / 8; + } + count += 2; /* frame footer */ + + return count; +} |