Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 1 | /*********************************************************************** |
| 2 | Copyright (c) 2006-2011, Skype Limited. All rights reserved. |
| 3 | Redistribution and use in source and binary forms, with or without |
Jean-Marc Valin | ae00e60 | 2012-04-20 16:31:04 -0400 | [diff] [blame] | 4 | modification, are permitted provided that the following conditions |
| 5 | are met: |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 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. |
Ralph Giles | f2446c2 | 2013-09-16 14:40:04 -0700 | [diff] [blame] | 11 | - Neither the name of Internet Society, IETF or IETF Trust, nor the |
Jean-Marc Valin | ae00e60 | 2012-04-20 16:31:04 -0400 | [diff] [blame] | 12 | names of specific contributors, may be used to endorse or promote |
| 13 | products derived from this software without specific prior written |
| 14 | permission. |
Timothy B. Terriberry | 80ad383 | 2013-05-19 18:00:39 -0700 | [diff] [blame] | 15 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
Jean-Marc Valin | ae00e60 | 2012-04-20 16:31:04 -0400 | [diff] [blame] | 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. |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 26 | ***********************************************************************/ |
| 27 | |
Jean-Marc Valin | 5a48412 | 2011-08-15 10:49:53 -0400 | [diff] [blame] | 28 | #ifdef HAVE_CONFIG_H |
| 29 | #include "config.h" |
| 30 | #endif |
| 31 | |
Jean-Marc Valin | 1c2f563 | 2011-09-16 01:16:53 -0700 | [diff] [blame] | 32 | #include "main.h" |
| 33 | #include "tuning_parameters.h" |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 34 | |
| 35 | /* Control internal sampling rate */ |
| 36 | opus_int silk_control_audio_bandwidth( |
Koen Vos | acc7a6c | 2011-10-28 19:44:26 -0400 | [diff] [blame] | 37 | silk_encoder_state *psEncC, /* I/O Pointer to Silk encoder state */ |
| 38 | silk_EncControlStruct *encControl /* I Control structure */ |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 39 | ) |
| 40 | { |
| 41 | opus_int fs_kHz; |
Jean-Marc Valin | cd78f39 | 2018-05-23 16:59:23 -0400 | [diff] [blame^] | 42 | opus_int orig_kHz; |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 43 | opus_int32 fs_Hz; |
| 44 | |
Jean-Marc Valin | cd78f39 | 2018-05-23 16:59:23 -0400 | [diff] [blame^] | 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; |
Jean-Marc Valin | fb3a437 | 2011-09-16 00:58:26 -0700 | [diff] [blame] | 51 | fs_Hz = silk_SMULBB( fs_kHz, 1000 ); |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 52 | if( fs_Hz == 0 ) { |
| 53 | /* Encoder has just been initialized */ |
Jean-Marc Valin | fb3a437 | 2011-09-16 00:58:26 -0700 | [diff] [blame] | 54 | fs_Hz = silk_min( psEncC->desiredInternal_fs_Hz, psEncC->API_fs_Hz ); |
| 55 | fs_kHz = silk_DIV32_16( fs_Hz, 1000 ); |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 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; |
Jean-Marc Valin | fb3a437 | 2011-09-16 00:58:26 -0700 | [diff] [blame] | 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 ); |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 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 | } |
Jean-Marc Valin | 3b2aee0 | 2011-10-21 23:21:34 -0400 | [diff] [blame] | 68 | if( psEncC->allow_bandwidth_switch || encControl->opusCanSwitch ) { |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 69 | /* Check if we should switch down */ |
Jean-Marc Valin | cd78f39 | 2018-05-23 16:59:23 -0400 | [diff] [blame^] | 70 | if( silk_SMULBB( orig_kHz, 1000 ) > psEncC->desiredInternal_fs_Hz ) |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 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 */ |
Jean-Marc Valin | fb3a437 | 2011-09-16 00:58:26 -0700 | [diff] [blame] | 78 | silk_memset( psEncC->sLP.In_LP_State, 0, sizeof( psEncC->sLP.In_LP_State ) ); |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 79 | } |
Koen Vos | acc7a6c | 2011-10-28 19:44:26 -0400 | [diff] [blame] | 80 | if( encControl->opusCanSwitch ) { |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 81 | /* Stop transition phase */ |
| 82 | psEncC->sLP.mode = 0; |
| 83 | |
| 84 | /* Switch to a lower sample frequency */ |
Jean-Marc Valin | cd78f39 | 2018-05-23 16:59:23 -0400 | [diff] [blame^] | 85 | fs_kHz = orig_kHz == 16 ? 12 : 8; |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 86 | } else { |
Jean-Marc Valin | 3b2aee0 | 2011-10-21 23:21:34 -0400 | [diff] [blame] | 87 | if( psEncC->sLP.transition_frame_no <= 0 ) { |
| 88 | encControl->switchReady = 1; |
Jean-Marc Valin | 6b45974 | 2012-09-20 22:00:22 -0400 | [diff] [blame] | 89 | /* Make room for redundancy */ |
| 90 | encControl->maxBits -= encControl->maxBits * 5 / ( encControl->payloadSize_ms + 5 ); |
Jean-Marc Valin | 3b2aee0 | 2011-10-21 23:21:34 -0400 | [diff] [blame] | 91 | } else { |
| 92 | /* Direction: down (at double speed) */ |
| 93 | psEncC->sLP.mode = -2; |
| 94 | } |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 95 | } |
| 96 | } |
| 97 | else |
| 98 | /* Check if we should switch up */ |
Jean-Marc Valin | cd78f39 | 2018-05-23 16:59:23 -0400 | [diff] [blame^] | 99 | if( silk_SMULBB( orig_kHz, 1000 ) < psEncC->desiredInternal_fs_Hz ) |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 100 | { |
| 101 | /* Switch up */ |
Koen Vos | acc7a6c | 2011-10-28 19:44:26 -0400 | [diff] [blame] | 102 | if( encControl->opusCanSwitch ) { |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 103 | /* Switch to a higher sample frequency */ |
Jean-Marc Valin | cd78f39 | 2018-05-23 16:59:23 -0400 | [diff] [blame^] | 104 | fs_kHz = orig_kHz == 8 ? 12 : 16; |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 105 | |
| 106 | /* New transition */ |
| 107 | psEncC->sLP.transition_frame_no = 0; |
| 108 | |
| 109 | /* Reset transition filter state */ |
Jean-Marc Valin | fb3a437 | 2011-09-16 00:58:26 -0700 | [diff] [blame] | 110 | silk_memset( psEncC->sLP.In_LP_State, 0, sizeof( psEncC->sLP.In_LP_State ) ); |
Jean-Marc Valin | 3b2aee0 | 2011-10-21 23:21:34 -0400 | [diff] [blame] | 111 | |
| 112 | /* Direction: up */ |
| 113 | psEncC->sLP.mode = 1; |
| 114 | } else { |
| 115 | if( psEncC->sLP.mode == 0 ) { |
| 116 | encControl->switchReady = 1; |
Jean-Marc Valin | 6b45974 | 2012-09-20 22:00:22 -0400 | [diff] [blame] | 117 | /* Make room for redundancy */ |
| 118 | encControl->maxBits -= encControl->maxBits * 5 / ( encControl->payloadSize_ms + 5 ); |
Jean-Marc Valin | 3b2aee0 | 2011-10-21 23:21:34 -0400 | [diff] [blame] | 119 | } else { |
| 120 | /* Direction: up */ |
| 121 | psEncC->sLP.mode = 1; |
| 122 | } |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 123 | } |
Jean-Marc Valin | 3ecd9c2 | 2013-02-19 00:42:15 -0500 | [diff] [blame] | 124 | } else { |
| 125 | if (psEncC->sLP.mode<0) |
| 126 | psEncC->sLP.mode = 1; |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 127 | } |
| 128 | } |
| 129 | } |
| 130 | |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 131 | return fs_kHz; |
| 132 | } |