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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6147 | serge | 1 | /* |
| 2 | * common code shared by all WMA variants |
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| 3 | * |
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| 4 | * This file is part of FFmpeg. |
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| 5 | * |
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| 6 | * FFmpeg is free software; you can redistribute it and/or |
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| 7 | * modify it under the terms of the GNU Lesser General Public |
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| 8 | * License as published by the Free Software Foundation; either |
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| 9 | * version 2.1 of the License, or (at your option) any later version. |
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| 10 | * |
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| 11 | * FFmpeg is distributed in the hope that it will be useful, |
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | * Lesser General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU Lesser General Public |
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| 17 | * License along with FFmpeg; if not, write to the Free Software |
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| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 19 | */ |
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| 20 | |||
| 21 | #include "libavutil/attributes.h" |
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| 22 | |||
| 23 | #include "wma_common.h" |
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| 24 | |||
| 25 | /** |
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| 26 | *@brief Get the samples per frame for this stream. |
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| 27 | *@param sample_rate output sample_rate |
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| 28 | *@param version wma version |
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| 29 | *@param decode_flags codec compression features |
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| 30 | *@return log2 of the number of output samples per frame |
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| 31 | */ |
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| 32 | av_cold int ff_wma_get_frame_len_bits(int sample_rate, int version, |
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| 33 | unsigned int decode_flags) |
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| 34 | { |
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| 35 | int frame_len_bits; |
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| 36 | |||
| 37 | if (sample_rate <= 16000) |
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| 38 | frame_len_bits = 9; |
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| 39 | else if (sample_rate <= 22050 || (sample_rate <= 32000 && version == 1)) |
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| 40 | frame_len_bits = 10; |
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| 41 | else if (sample_rate <= 48000 || version < 3) |
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| 42 | frame_len_bits = 11; |
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| 43 | else if (sample_rate <= 96000) |
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| 44 | frame_len_bits = 12; |
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| 45 | else |
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| 46 | frame_len_bits = 13; |
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| 47 | |||
| 48 | if (version == 3) { |
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| 49 | int tmp = decode_flags & 0x6; |
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| 50 | if (tmp == 0x2) |
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| 51 | ++frame_len_bits; |
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| 52 | else if (tmp == 0x4) |
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| 53 | --frame_len_bits; |
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| 54 | else if (tmp == 0x6) |
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| 55 | frame_len_bits -= 2; |
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| 56 | } |
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| 57 | |||
| 58 | return frame_len_bits; |
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| 59 | } |