diff options
Diffstat (limited to 'lib/rbcodec/codecs/libopus/silk/control_audio_bandwidth.c')
-rw-r--r-- | lib/rbcodec/codecs/libopus/silk/control_audio_bandwidth.c | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libopus/silk/control_audio_bandwidth.c b/lib/rbcodec/codecs/libopus/silk/control_audio_bandwidth.c new file mode 100644 index 0000000000..f6d22d8395 --- /dev/null +++ b/lib/rbcodec/codecs/libopus/silk/control_audio_bandwidth.c | |||
@@ -0,0 +1,132 @@ | |||
1 | /*********************************************************************** | ||
2 | Copyright (c) 2006-2011, Skype Limited. All rights reserved. | ||
3 | Redistribution and use in source and binary forms, with or without | ||
4 | modification, are permitted provided that the following conditions | ||
5 | are met: | ||
6 | - Redistributions of source code must retain the above copyright notice, | ||
7 | this list of conditions and the following disclaimer. | ||
8 | - Redistributions in binary form must reproduce the above copyright | ||
9 | notice, this list of conditions and the following disclaimer in the | ||
10 | documentation and/or other materials provided with the distribution. | ||
11 | - Neither the name of Internet Society, IETF or IETF Trust, nor the | ||
12 | names of specific contributors, may be used to endorse or promote | ||
13 | products derived from this software without specific prior written | ||
14 | permission. | ||
15 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | ||
16 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
17 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | ||
18 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | ||
19 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | ||
20 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | ||
21 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | ||
22 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | ||
23 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | ||
24 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | ||
25 | POSSIBILITY OF SUCH DAMAGE. | ||
26 | ***********************************************************************/ | ||
27 | |||
28 | #ifdef HAVE_CONFIG_H | ||
29 | #include "config.h" | ||
30 | #endif | ||
31 | |||
32 | #include "main.h" | ||
33 | #include "tuning_parameters.h" | ||
34 | |||
35 | /* Control internal sampling rate */ | ||
36 | opus_int silk_control_audio_bandwidth( | ||
37 | silk_encoder_state *psEncC, /* I/O Pointer to Silk encoder state */ | ||
38 | silk_EncControlStruct *encControl /* I Control structure */ | ||
39 | ) | ||
40 | { | ||
41 | opus_int fs_kHz; | ||
42 | opus_int orig_kHz; | ||
43 | opus_int32 fs_Hz; | ||
44 | |||
45 | orig_kHz = psEncC->fs_kHz; | ||
46 | /* Handle a bandwidth-switching reset where we need to be aware what the last sampling rate was. */ | ||
47 | if( orig_kHz == 0 ) { | ||
48 | orig_kHz = psEncC->sLP.saved_fs_kHz; | ||
49 | } | ||
50 | fs_kHz = orig_kHz; | ||
51 | fs_Hz = silk_SMULBB( fs_kHz, 1000 ); | ||
52 | if( fs_Hz == 0 ) { | ||
53 | /* Encoder has just been initialized */ | ||
54 | fs_Hz = silk_min( psEncC->desiredInternal_fs_Hz, psEncC->API_fs_Hz ); | ||
55 | fs_kHz = silk_DIV32_16( fs_Hz, 1000 ); | ||
56 | } else if( fs_Hz > psEncC->API_fs_Hz || fs_Hz > psEncC->maxInternal_fs_Hz || fs_Hz < psEncC->minInternal_fs_Hz ) { | ||
57 | /* Make sure internal rate is not higher than external rate or maximum allowed, or lower than minimum allowed */ | ||
58 | fs_Hz = psEncC->API_fs_Hz; | ||
59 | fs_Hz = silk_min( fs_Hz, psEncC->maxInternal_fs_Hz ); | ||
60 | fs_Hz = silk_max( fs_Hz, psEncC->minInternal_fs_Hz ); | ||
61 | fs_kHz = silk_DIV32_16( fs_Hz, 1000 ); | ||
62 | } else { | ||
63 | /* State machine for the internal sampling rate switching */ | ||
64 | if( psEncC->sLP.transition_frame_no >= TRANSITION_FRAMES ) { | ||
65 | /* Stop transition phase */ | ||
66 | psEncC->sLP.mode = 0; | ||
67 | } | ||
68 | if( psEncC->allow_bandwidth_switch || encControl->opusCanSwitch ) { | ||
69 | /* Check if we should switch down */ | ||
70 | if( silk_SMULBB( orig_kHz, 1000 ) > psEncC->desiredInternal_fs_Hz ) | ||
71 | { | ||
72 | /* Switch down */ | ||
73 | if( psEncC->sLP.mode == 0 ) { | ||
74 | /* New transition */ | ||
75 | psEncC->sLP.transition_frame_no = TRANSITION_FRAMES; | ||
76 | |||
77 | /* Reset transition filter state */ | ||
78 | silk_memset( psEncC->sLP.In_LP_State, 0, sizeof( psEncC->sLP.In_LP_State ) ); | ||
79 | } | ||
80 | if( encControl->opusCanSwitch ) { | ||
81 | /* Stop transition phase */ | ||
82 | psEncC->sLP.mode = 0; | ||
83 | |||
84 | /* Switch to a lower sample frequency */ | ||
85 | fs_kHz = orig_kHz == 16 ? 12 : 8; | ||
86 | } else { | ||
87 | if( psEncC->sLP.transition_frame_no <= 0 ) { | ||
88 | encControl->switchReady = 1; | ||
89 | /* Make room for redundancy */ | ||
90 | encControl->maxBits -= encControl->maxBits * 5 / ( encControl->payloadSize_ms + 5 ); | ||
91 | } else { | ||
92 | /* Direction: down (at double speed) */ | ||
93 | psEncC->sLP.mode = -2; | ||
94 | } | ||
95 | } | ||
96 | } | ||
97 | else | ||
98 | /* Check if we should switch up */ | ||
99 | if( silk_SMULBB( orig_kHz, 1000 ) < psEncC->desiredInternal_fs_Hz ) | ||
100 | { | ||
101 | /* Switch up */ | ||
102 | if( encControl->opusCanSwitch ) { | ||
103 | /* Switch to a higher sample frequency */ | ||
104 | fs_kHz = orig_kHz == 8 ? 12 : 16; | ||
105 | |||
106 | /* New transition */ | ||
107 | psEncC->sLP.transition_frame_no = 0; | ||
108 | |||
109 | /* Reset transition filter state */ | ||
110 | silk_memset( psEncC->sLP.In_LP_State, 0, sizeof( psEncC->sLP.In_LP_State ) ); | ||
111 | |||
112 | /* Direction: up */ | ||
113 | psEncC->sLP.mode = 1; | ||
114 | } else { | ||
115 | if( psEncC->sLP.mode == 0 ) { | ||
116 | encControl->switchReady = 1; | ||
117 | /* Make room for redundancy */ | ||
118 | encControl->maxBits -= encControl->maxBits * 5 / ( encControl->payloadSize_ms + 5 ); | ||
119 | } else { | ||
120 | /* Direction: up */ | ||
121 | psEncC->sLP.mode = 1; | ||
122 | } | ||
123 | } | ||
124 | } else { | ||
125 | if (psEncC->sLP.mode<0) | ||
126 | psEncC->sLP.mode = 1; | ||
127 | } | ||
128 | } | ||
129 | } | ||
130 | |||
131 | return fs_kHz; | ||
132 | } | ||