1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libopus/silk/control_audio_bandwidth.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,126 @@
1.4 +/***********************************************************************
1.5 +Copyright (c) 2006-2011, Skype Limited. All rights reserved.
1.6 +Redistribution and use in source and binary forms, with or without
1.7 +modification, are permitted provided that the following conditions
1.8 +are met:
1.9 +- Redistributions of source code must retain the above copyright notice,
1.10 +this list of conditions and the following disclaimer.
1.11 +- Redistributions in binary form must reproduce the above copyright
1.12 +notice, this list of conditions and the following disclaimer in the
1.13 +documentation and/or other materials provided with the distribution.
1.14 +- Neither the name of Internet Society, IETF or IETF Trust, nor the
1.15 +names of specific contributors, may be used to endorse or promote
1.16 +products derived from this software without specific prior written
1.17 +permission.
1.18 +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
1.19 +AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1.20 +IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1.21 +ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
1.22 +LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
1.23 +CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
1.24 +SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
1.25 +INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
1.26 +CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
1.27 +ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
1.28 +POSSIBILITY OF SUCH DAMAGE.
1.29 +***********************************************************************/
1.30 +
1.31 +#ifdef HAVE_CONFIG_H
1.32 +#include "config.h"
1.33 +#endif
1.34 +
1.35 +#include "main.h"
1.36 +#include "tuning_parameters.h"
1.37 +
1.38 +/* Control internal sampling rate */
1.39 +opus_int silk_control_audio_bandwidth(
1.40 + silk_encoder_state *psEncC, /* I/O Pointer to Silk encoder state */
1.41 + silk_EncControlStruct *encControl /* I Control structure */
1.42 +)
1.43 +{
1.44 + opus_int fs_kHz;
1.45 + opus_int32 fs_Hz;
1.46 +
1.47 + fs_kHz = psEncC->fs_kHz;
1.48 + fs_Hz = silk_SMULBB( fs_kHz, 1000 );
1.49 + if( fs_Hz == 0 ) {
1.50 + /* Encoder has just been initialized */
1.51 + fs_Hz = silk_min( psEncC->desiredInternal_fs_Hz, psEncC->API_fs_Hz );
1.52 + fs_kHz = silk_DIV32_16( fs_Hz, 1000 );
1.53 + } else if( fs_Hz > psEncC->API_fs_Hz || fs_Hz > psEncC->maxInternal_fs_Hz || fs_Hz < psEncC->minInternal_fs_Hz ) {
1.54 + /* Make sure internal rate is not higher than external rate or maximum allowed, or lower than minimum allowed */
1.55 + fs_Hz = psEncC->API_fs_Hz;
1.56 + fs_Hz = silk_min( fs_Hz, psEncC->maxInternal_fs_Hz );
1.57 + fs_Hz = silk_max( fs_Hz, psEncC->minInternal_fs_Hz );
1.58 + fs_kHz = silk_DIV32_16( fs_Hz, 1000 );
1.59 + } else {
1.60 + /* State machine for the internal sampling rate switching */
1.61 + if( psEncC->sLP.transition_frame_no >= TRANSITION_FRAMES ) {
1.62 + /* Stop transition phase */
1.63 + psEncC->sLP.mode = 0;
1.64 + }
1.65 + if( psEncC->allow_bandwidth_switch || encControl->opusCanSwitch ) {
1.66 + /* Check if we should switch down */
1.67 + if( silk_SMULBB( psEncC->fs_kHz, 1000 ) > psEncC->desiredInternal_fs_Hz )
1.68 + {
1.69 + /* Switch down */
1.70 + if( psEncC->sLP.mode == 0 ) {
1.71 + /* New transition */
1.72 + psEncC->sLP.transition_frame_no = TRANSITION_FRAMES;
1.73 +
1.74 + /* Reset transition filter state */
1.75 + silk_memset( psEncC->sLP.In_LP_State, 0, sizeof( psEncC->sLP.In_LP_State ) );
1.76 + }
1.77 + if( encControl->opusCanSwitch ) {
1.78 + /* Stop transition phase */
1.79 + psEncC->sLP.mode = 0;
1.80 +
1.81 + /* Switch to a lower sample frequency */
1.82 + fs_kHz = psEncC->fs_kHz == 16 ? 12 : 8;
1.83 + } else {
1.84 + if( psEncC->sLP.transition_frame_no <= 0 ) {
1.85 + encControl->switchReady = 1;
1.86 + /* Make room for redundancy */
1.87 + encControl->maxBits -= encControl->maxBits * 5 / ( encControl->payloadSize_ms + 5 );
1.88 + } else {
1.89 + /* Direction: down (at double speed) */
1.90 + psEncC->sLP.mode = -2;
1.91 + }
1.92 + }
1.93 + }
1.94 + else
1.95 + /* Check if we should switch up */
1.96 + if( silk_SMULBB( psEncC->fs_kHz, 1000 ) < psEncC->desiredInternal_fs_Hz )
1.97 + {
1.98 + /* Switch up */
1.99 + if( encControl->opusCanSwitch ) {
1.100 + /* Switch to a higher sample frequency */
1.101 + fs_kHz = psEncC->fs_kHz == 8 ? 12 : 16;
1.102 +
1.103 + /* New transition */
1.104 + psEncC->sLP.transition_frame_no = 0;
1.105 +
1.106 + /* Reset transition filter state */
1.107 + silk_memset( psEncC->sLP.In_LP_State, 0, sizeof( psEncC->sLP.In_LP_State ) );
1.108 +
1.109 + /* Direction: up */
1.110 + psEncC->sLP.mode = 1;
1.111 + } else {
1.112 + if( psEncC->sLP.mode == 0 ) {
1.113 + encControl->switchReady = 1;
1.114 + /* Make room for redundancy */
1.115 + encControl->maxBits -= encControl->maxBits * 5 / ( encControl->payloadSize_ms + 5 );
1.116 + } else {
1.117 + /* Direction: up */
1.118 + psEncC->sLP.mode = 1;
1.119 + }
1.120 + }
1.121 + } else {
1.122 + if (psEncC->sLP.mode<0)
1.123 + psEncC->sLP.mode = 1;
1.124 + }
1.125 + }
1.126 + }
1.127 +
1.128 + return fs_kHz;
1.129 +}
