media/libopus/silk/control_audio_bandwidth.c@ac0c01689b40 (annotated)
media/libopus/silk/control_audio_bandwidth.c
Thu, 15 Jan 2015 15:59:08 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 15 Jan 2015 15:59:08 +0100
- branch
- TOR_BUG_9701
- changeset 10
- ac0c01689b40
- permissions
- -rw-r--r--
Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
| michael@0 | 1 | /*********************************************************************** |
| michael@0 | 2 | Copyright (c) 2006-2011, Skype Limited. All rights reserved. |
| michael@0 | 3 | Redistribution and use in source and binary forms, with or without |
| michael@0 | 4 | modification, are permitted provided that the following conditions |
| michael@0 | 5 | are met: |
| michael@0 | 6 | - Redistributions of source code must retain the above copyright notice, |
| michael@0 | 7 | this list of conditions and the following disclaimer. |
| michael@0 | 8 | - Redistributions in binary form must reproduce the above copyright |
| michael@0 | 9 | notice, this list of conditions and the following disclaimer in the |
| michael@0 | 10 | documentation and/or other materials provided with the distribution. |
| michael@0 | 11 | - Neither the name of Internet Society, IETF or IETF Trust, nor the |
| michael@0 | 12 | names of specific contributors, may be used to endorse or promote |
| michael@0 | 13 | products derived from this software without specific prior written |
| michael@0 | 14 | permission. |
| michael@0 | 15 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| michael@0 | 16 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| michael@0 | 17 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| michael@0 | 18 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| michael@0 | 19 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| michael@0 | 20 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| michael@0 | 21 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| michael@0 | 22 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| michael@0 | 23 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| michael@0 | 24 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| michael@0 | 25 | POSSIBILITY OF SUCH DAMAGE. |
| michael@0 | 26 | ***********************************************************************/ |
| michael@0 | 27 | |
| michael@0 | 28 | #ifdef HAVE_CONFIG_H |
| michael@0 | 29 | #include "config.h" |
| michael@0 | 30 | #endif |
| michael@0 | 31 | |
| michael@0 | 32 | #include "main.h" |
| michael@0 | 33 | #include "tuning_parameters.h" |
| michael@0 | 34 | |
| michael@0 | 35 | /* Control internal sampling rate */ |
| michael@0 | 36 | opus_int silk_control_audio_bandwidth( |
| michael@0 | 37 | silk_encoder_state *psEncC, /* I/O Pointer to Silk encoder state */ |
| michael@0 | 38 | silk_EncControlStruct *encControl /* I Control structure */ |
| michael@0 | 39 | ) |
| michael@0 | 40 | { |
| michael@0 | 41 | opus_int fs_kHz; |
| michael@0 | 42 | opus_int32 fs_Hz; |
| michael@0 | 43 | |
| michael@0 | 44 | fs_kHz = psEncC->fs_kHz; |
| michael@0 | 45 | fs_Hz = silk_SMULBB( fs_kHz, 1000 ); |
| michael@0 | 46 | if( fs_Hz == 0 ) { |
| michael@0 | 47 | /* Encoder has just been initialized */ |
| michael@0 | 48 | fs_Hz = silk_min( psEncC->desiredInternal_fs_Hz, psEncC->API_fs_Hz ); |
| michael@0 | 49 | fs_kHz = silk_DIV32_16( fs_Hz, 1000 ); |
| michael@0 | 50 | } else if( fs_Hz > psEncC->API_fs_Hz || fs_Hz > psEncC->maxInternal_fs_Hz || fs_Hz < psEncC->minInternal_fs_Hz ) { |
| michael@0 | 51 | /* Make sure internal rate is not higher than external rate or maximum allowed, or lower than minimum allowed */ |
| michael@0 | 52 | fs_Hz = psEncC->API_fs_Hz; |
| michael@0 | 53 | fs_Hz = silk_min( fs_Hz, psEncC->maxInternal_fs_Hz ); |
| michael@0 | 54 | fs_Hz = silk_max( fs_Hz, psEncC->minInternal_fs_Hz ); |
| michael@0 | 55 | fs_kHz = silk_DIV32_16( fs_Hz, 1000 ); |
| michael@0 | 56 | } else { |
| michael@0 | 57 | /* State machine for the internal sampling rate switching */ |
| michael@0 | 58 | if( psEncC->sLP.transition_frame_no >= TRANSITION_FRAMES ) { |
| michael@0 | 59 | /* Stop transition phase */ |
| michael@0 | 60 | psEncC->sLP.mode = 0; |
| michael@0 | 61 | } |
| michael@0 | 62 | if( psEncC->allow_bandwidth_switch || encControl->opusCanSwitch ) { |
| michael@0 | 63 | /* Check if we should switch down */ |
| michael@0 | 64 | if( silk_SMULBB( psEncC->fs_kHz, 1000 ) > psEncC->desiredInternal_fs_Hz ) |
| michael@0 | 65 | { |
| michael@0 | 66 | /* Switch down */ |
| michael@0 | 67 | if( psEncC->sLP.mode == 0 ) { |
| michael@0 | 68 | /* New transition */ |
| michael@0 | 69 | psEncC->sLP.transition_frame_no = TRANSITION_FRAMES; |
| michael@0 | 70 | |
| michael@0 | 71 | /* Reset transition filter state */ |
| michael@0 | 72 | silk_memset( psEncC->sLP.In_LP_State, 0, sizeof( psEncC->sLP.In_LP_State ) ); |
| michael@0 | 73 | } |
| michael@0 | 74 | if( encControl->opusCanSwitch ) { |
| michael@0 | 75 | /* Stop transition phase */ |
| michael@0 | 76 | psEncC->sLP.mode = 0; |
| michael@0 | 77 | |
| michael@0 | 78 | /* Switch to a lower sample frequency */ |
| michael@0 | 79 | fs_kHz = psEncC->fs_kHz == 16 ? 12 : 8; |
| michael@0 | 80 | } else { |
| michael@0 | 81 | if( psEncC->sLP.transition_frame_no <= 0 ) { |
| michael@0 | 82 | encControl->switchReady = 1; |
| michael@0 | 83 | /* Make room for redundancy */ |
| michael@0 | 84 | encControl->maxBits -= encControl->maxBits * 5 / ( encControl->payloadSize_ms + 5 ); |
| michael@0 | 85 | } else { |
| michael@0 | 86 | /* Direction: down (at double speed) */ |
| michael@0 | 87 | psEncC->sLP.mode = -2; |
| michael@0 | 88 | } |
| michael@0 | 89 | } |
| michael@0 | 90 | } |
| michael@0 | 91 | else |
| michael@0 | 92 | /* Check if we should switch up */ |
| michael@0 | 93 | if( silk_SMULBB( psEncC->fs_kHz, 1000 ) < psEncC->desiredInternal_fs_Hz ) |
| michael@0 | 94 | { |
| michael@0 | 95 | /* Switch up */ |
| michael@0 | 96 | if( encControl->opusCanSwitch ) { |
| michael@0 | 97 | /* Switch to a higher sample frequency */ |
| michael@0 | 98 | fs_kHz = psEncC->fs_kHz == 8 ? 12 : 16; |
| michael@0 | 99 | |
| michael@0 | 100 | /* New transition */ |
| michael@0 | 101 | psEncC->sLP.transition_frame_no = 0; |
| michael@0 | 102 | |
| michael@0 | 103 | /* Reset transition filter state */ |
| michael@0 | 104 | silk_memset( psEncC->sLP.In_LP_State, 0, sizeof( psEncC->sLP.In_LP_State ) ); |
| michael@0 | 105 | |
| michael@0 | 106 | /* Direction: up */ |
| michael@0 | 107 | psEncC->sLP.mode = 1; |
| michael@0 | 108 | } else { |
| michael@0 | 109 | if( psEncC->sLP.mode == 0 ) { |
| michael@0 | 110 | encControl->switchReady = 1; |
| michael@0 | 111 | /* Make room for redundancy */ |
| michael@0 | 112 | encControl->maxBits -= encControl->maxBits * 5 / ( encControl->payloadSize_ms + 5 ); |
| michael@0 | 113 | } else { |
| michael@0 | 114 | /* Direction: up */ |
| michael@0 | 115 | psEncC->sLP.mode = 1; |
| michael@0 | 116 | } |
| michael@0 | 117 | } |
| michael@0 | 118 | } else { |
| michael@0 | 119 | if (psEncC->sLP.mode<0) |
| michael@0 | 120 | psEncC->sLP.mode = 1; |
| michael@0 | 121 | } |
| michael@0 | 122 | } |
| michael@0 | 123 | } |
| michael@0 | 124 | |
| michael@0 | 125 | return fs_kHz; |
| michael@0 | 126 | } |
