repositories / deb_ffmpeg.git / blame
| Commit | Line | Data |
|---|---|---|
| 2ba45a60 DM |
1 | /* |
| 2 | * common code shared by all WMA variants | |
| 3 | * | |
| 4 | * This file is part of FFmpeg. | |
| 5 | * | |
| 6 | * FFmpeg is free software; you can redistribute it and/or | |
| 7 | * modify it under the terms of the GNU Lesser General Public | |
| 8 | * License as published by the Free Software Foundation; either | |
| 9 | * version 2.1 of the License, or (at your option) any later version. | |
| 10 | * | |
| 11 | * FFmpeg is distributed in the hope that it will be useful, | |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 14 | * Lesser General Public License for more details. | |
| 15 | * | |
| 16 | * You should have received a copy of the GNU Lesser General Public | |
| 17 | * License along with FFmpeg; if not, write to the Free Software | |
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| 19 | */ | |
| 20 | ||
| 21 | #include "libavutil/attributes.h" | |
| 22 | ||
| 23 | #include "wma_common.h" | |
| 24 | ||
| 25 | /** | |
| 26 | *@brief Get the samples per frame for this stream. | |
| 27 | *@param sample_rate output sample_rate | |
| 28 | *@param version wma version | |
| 29 | *@param decode_flags codec compression features | |
| 30 | *@return log2 of the number of output samples per frame | |
| 31 | */ | |
| 32 | av_cold int ff_wma_get_frame_len_bits(int sample_rate, int version, | |
| 33 | unsigned int decode_flags) | |
| 34 | { | |
| 35 | int frame_len_bits; | |
| 36 | ||
| 37 | if (sample_rate <= 16000) | |
| 38 | frame_len_bits = 9; | |
| 39 | else if (sample_rate <= 22050 || (sample_rate <= 32000 && version == 1)) | |
| 40 | frame_len_bits = 10; | |
| 41 | else if (sample_rate <= 48000 || version < 3) | |
| 42 | frame_len_bits = 11; | |
| 43 | else if (sample_rate <= 96000) | |
| 44 | frame_len_bits = 12; | |
| 45 | else | |
| 46 | frame_len_bits = 13; | |
| 47 | ||
| 48 | if (version == 3) { | |
| 49 | int tmp = decode_flags & 0x6; | |
| 50 | if (tmp == 0x2) | |
| 51 | ++frame_len_bits; | |
| 52 | else if (tmp == 0x4) | |
| 53 | --frame_len_bits; | |
| 54 | else if (tmp == 0x6) | |
| 55 | frame_len_bits -= 2; | |
| 56 | } | |
| 57 | ||
| 58 | return frame_len_bits; | |
| 59 | } |