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Diffstat (limited to 'lib/rbcodec/codecs/libopus/silk/control_audio_bandwidth.c')
-rw-r--r--lib/rbcodec/codecs/libopus/silk/control_audio_bandwidth.c132
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
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+++ b/lib/rbcodec/codecs/libopus/silk/control_audio_bandwidth.c
@@ -0,0 +1,132 @@
1/***********************************************************************
2Copyright (c) 2006-2011, Skype Limited. All rights reserved.
3Redistribution and use in source and binary forms, with or without
4modification, are permitted provided that the following conditions
5are met:
6- Redistributions of source code must retain the above copyright notice,
7this list of conditions and the following disclaimer.
8- Redistributions in binary form must reproduce the above copyright
9notice, this list of conditions and the following disclaimer in the
10documentation and/or other materials provided with the distribution.
11- Neither the name of Internet Society, IETF or IETF Trust, nor the
12names of specific contributors, may be used to endorse or promote
13products derived from this software without specific prior written
14permission.
15THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
19LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
20CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
21SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25POSSIBILITY 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 */
36opus_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}
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