Alexandre Lision | 744f742 | 2013-09-25 11:39:37 -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 |
| 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. |
Alexandre Lision | 8538238 | 2014-01-27 15:54:16 -0500 | [diff] [blame] | 11 | - Neither the name of Internet Society, IETF or IETF Trust, nor the |
Alexandre Lision | 744f742 | 2013-09-25 11:39:37 -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. |
Alexandre Lision | 8538238 | 2014-01-27 15:54:16 -0500 | [diff] [blame] | 15 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
Alexandre Lision | 744f742 | 2013-09-25 11:39:37 -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. |
| 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_int32 fs_Hz; |
| 43 | |
| 44 | fs_kHz = psEncC->fs_kHz; |
| 45 | fs_Hz = silk_SMULBB( fs_kHz, 1000 ); |
| 46 | if( fs_Hz == 0 ) { |
| 47 | /* Encoder has just been initialized */ |
| 48 | fs_Hz = silk_min( psEncC->desiredInternal_fs_Hz, psEncC->API_fs_Hz ); |
| 49 | fs_kHz = silk_DIV32_16( fs_Hz, 1000 ); |
| 50 | } else if( fs_Hz > psEncC->API_fs_Hz || fs_Hz > psEncC->maxInternal_fs_Hz || fs_Hz < psEncC->minInternal_fs_Hz ) { |
| 51 | /* Make sure internal rate is not higher than external rate or maximum allowed, or lower than minimum allowed */ |
| 52 | fs_Hz = psEncC->API_fs_Hz; |
| 53 | fs_Hz = silk_min( fs_Hz, psEncC->maxInternal_fs_Hz ); |
| 54 | fs_Hz = silk_max( fs_Hz, psEncC->minInternal_fs_Hz ); |
| 55 | fs_kHz = silk_DIV32_16( fs_Hz, 1000 ); |
| 56 | } else { |
| 57 | /* State machine for the internal sampling rate switching */ |
| 58 | if( psEncC->sLP.transition_frame_no >= TRANSITION_FRAMES ) { |
| 59 | /* Stop transition phase */ |
| 60 | psEncC->sLP.mode = 0; |
| 61 | } |
| 62 | if( psEncC->allow_bandwidth_switch || encControl->opusCanSwitch ) { |
| 63 | /* Check if we should switch down */ |
| 64 | if( silk_SMULBB( psEncC->fs_kHz, 1000 ) > psEncC->desiredInternal_fs_Hz ) |
| 65 | { |
| 66 | /* Switch down */ |
| 67 | if( psEncC->sLP.mode == 0 ) { |
| 68 | /* New transition */ |
| 69 | psEncC->sLP.transition_frame_no = TRANSITION_FRAMES; |
| 70 | |
| 71 | /* Reset transition filter state */ |
| 72 | silk_memset( psEncC->sLP.In_LP_State, 0, sizeof( psEncC->sLP.In_LP_State ) ); |
| 73 | } |
| 74 | if( encControl->opusCanSwitch ) { |
| 75 | /* Stop transition phase */ |
| 76 | psEncC->sLP.mode = 0; |
| 77 | |
| 78 | /* Switch to a lower sample frequency */ |
| 79 | fs_kHz = psEncC->fs_kHz == 16 ? 12 : 8; |
| 80 | } else { |
| 81 | if( psEncC->sLP.transition_frame_no <= 0 ) { |
| 82 | encControl->switchReady = 1; |
| 83 | /* Make room for redundancy */ |
| 84 | encControl->maxBits -= encControl->maxBits * 5 / ( encControl->payloadSize_ms + 5 ); |
| 85 | } else { |
| 86 | /* Direction: down (at double speed) */ |
| 87 | psEncC->sLP.mode = -2; |
| 88 | } |
| 89 | } |
| 90 | } |
| 91 | else |
| 92 | /* Check if we should switch up */ |
| 93 | if( silk_SMULBB( psEncC->fs_kHz, 1000 ) < psEncC->desiredInternal_fs_Hz ) |
| 94 | { |
| 95 | /* Switch up */ |
| 96 | if( encControl->opusCanSwitch ) { |
| 97 | /* Switch to a higher sample frequency */ |
| 98 | fs_kHz = psEncC->fs_kHz == 8 ? 12 : 16; |
| 99 | |
| 100 | /* New transition */ |
| 101 | psEncC->sLP.transition_frame_no = 0; |
| 102 | |
| 103 | /* Reset transition filter state */ |
| 104 | silk_memset( psEncC->sLP.In_LP_State, 0, sizeof( psEncC->sLP.In_LP_State ) ); |
| 105 | |
| 106 | /* Direction: up */ |
| 107 | psEncC->sLP.mode = 1; |
| 108 | } else { |
| 109 | if( psEncC->sLP.mode == 0 ) { |
| 110 | encControl->switchReady = 1; |
| 111 | /* Make room for redundancy */ |
| 112 | encControl->maxBits -= encControl->maxBits * 5 / ( encControl->payloadSize_ms + 5 ); |
| 113 | } else { |
| 114 | /* Direction: up */ |
| 115 | psEncC->sLP.mode = 1; |
| 116 | } |
| 117 | } |
| 118 | } else { |
| 119 | if (psEncC->sLP.mode<0) |
| 120 | psEncC->sLP.mode = 1; |
| 121 | } |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | return fs_kHz; |
| 126 | } |