From 8ca6e523a604db69c151b20627fb3bcc52118392 Mon Sep 17 00:00:00 2001 From: Diego Biurrun Date: Tue, 6 Mar 2012 19:07:10 +0100 Subject: wma: Refactor common code to fix standalone compilation of WMA lossless decoder. --- libavcodec/wma_common.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 libavcodec/wma_common.c (limited to 'libavcodec/wma_common.c') diff --git a/libavcodec/wma_common.c b/libavcodec/wma_common.c new file mode 100644 index 0000000000..6ba5337f6a --- /dev/null +++ b/libavcodec/wma_common.c @@ -0,0 +1,62 @@ +/* + * common code shared by all WMA variants + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "libavutil/attributes.h" +#include "wma_common.h" + +/** + *@brief Get the samples per frame for this stream. + *@param sample_rate output sample_rate + *@param version wma version + *@param decode_flags codec compression features + *@return log2 of the number of output samples per frame + */ +int av_cold ff_wma_get_frame_len_bits(int sample_rate, int version, + unsigned int decode_flags) +{ + + int frame_len_bits; + + if (sample_rate <= 16000) { + frame_len_bits = 9; + } else if (sample_rate <= 22050 || + (sample_rate <= 32000 && version == 1)) { + frame_len_bits = 10; + } else if (sample_rate <= 48000 || version < 3) { + frame_len_bits = 11; + } else if (sample_rate <= 96000) { + frame_len_bits = 12; + } else { + frame_len_bits = 13; + } + + if (version == 3) { + int tmp = decode_flags & 0x6; + if (tmp == 0x2) { + ++frame_len_bits; + } else if (tmp == 0x4) { + --frame_len_bits; + } else if (tmp == 0x6) { + frame_len_bits -= 2; + } + } + + return frame_len_bits; +} -- cgit v1.2.3