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comparison: media/libopus/silk/control_audio_bandwidth.c
media/libopus/silk/control_audio_bandwidth.c
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:94cadfb6ba40 |
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| 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_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 } |
