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62 lines
1.9 KiB
62 lines
1.9 KiB
/* |
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* common code shared by all WMA variants |
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* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "libavutil/attributes.h" |
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#include "wma_common.h" |
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/** |
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*@brief Get the samples per frame for this stream. |
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*@param sample_rate output sample_rate |
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*@param version wma version |
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*@param decode_flags codec compression features |
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*@return log2 of the number of output samples per frame |
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*/ |
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av_cold int ff_wma_get_frame_len_bits(int sample_rate, int version, |
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unsigned int decode_flags) |
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{ |
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int frame_len_bits; |
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if (sample_rate <= 16000) { |
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frame_len_bits = 9; |
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} else if (sample_rate <= 22050 || |
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(sample_rate <= 32000 && version == 1)) { |
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frame_len_bits = 10; |
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} else if (sample_rate <= 48000 || version < 3) { |
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frame_len_bits = 11; |
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} else if (sample_rate <= 96000) { |
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frame_len_bits = 12; |
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} else { |
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frame_len_bits = 13; |
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} |
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if (version == 3) { |
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int tmp = decode_flags & 0x6; |
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if (tmp == 0x2) { |
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++frame_len_bits; |
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} else if (tmp == 0x4) { |
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--frame_len_bits; |
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} else if (tmp == 0x6) { |
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frame_len_bits -= 2; |
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} |
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} |
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return frame_len_bits; |
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}
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