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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 | } |