d9a291f641
Took the opportunity to undo the Godot changed made to the opus source. The opus module should eventually be built in its own environment to avoid polluting others with too many include dirs and defines. TODO: Fix the platform/ stuff for opus.
127 lines
5.6 KiB
C
127 lines
5.6 KiB
C
/***********************************************************************
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Copyright (c) 2006-2011, Skype Limited. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of Internet Society, IETF or IETF Trust, nor the
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names of specific contributors, may be used to endorse or promote
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products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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***********************************************************************/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "main.h"
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#include "tuning_parameters.h"
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/* Control internal sampling rate */
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opus_int silk_control_audio_bandwidth(
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silk_encoder_state *psEncC, /* I/O Pointer to Silk encoder state */
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silk_EncControlStruct *encControl /* I Control structure */
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)
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{
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opus_int fs_kHz;
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opus_int32 fs_Hz;
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fs_kHz = psEncC->fs_kHz;
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fs_Hz = silk_SMULBB( fs_kHz, 1000 );
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if( fs_Hz == 0 ) {
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/* Encoder has just been initialized */
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fs_Hz = silk_min( psEncC->desiredInternal_fs_Hz, psEncC->API_fs_Hz );
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fs_kHz = silk_DIV32_16( fs_Hz, 1000 );
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} else if( fs_Hz > psEncC->API_fs_Hz || fs_Hz > psEncC->maxInternal_fs_Hz || fs_Hz < psEncC->minInternal_fs_Hz ) {
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/* Make sure internal rate is not higher than external rate or maximum allowed, or lower than minimum allowed */
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fs_Hz = psEncC->API_fs_Hz;
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fs_Hz = silk_min( fs_Hz, psEncC->maxInternal_fs_Hz );
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fs_Hz = silk_max( fs_Hz, psEncC->minInternal_fs_Hz );
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fs_kHz = silk_DIV32_16( fs_Hz, 1000 );
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} else {
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/* State machine for the internal sampling rate switching */
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if( psEncC->sLP.transition_frame_no >= TRANSITION_FRAMES ) {
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/* Stop transition phase */
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psEncC->sLP.mode = 0;
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}
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if( psEncC->allow_bandwidth_switch || encControl->opusCanSwitch ) {
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/* Check if we should switch down */
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if( silk_SMULBB( psEncC->fs_kHz, 1000 ) > psEncC->desiredInternal_fs_Hz )
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{
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/* Switch down */
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if( psEncC->sLP.mode == 0 ) {
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/* New transition */
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psEncC->sLP.transition_frame_no = TRANSITION_FRAMES;
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/* Reset transition filter state */
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silk_memset( psEncC->sLP.In_LP_State, 0, sizeof( psEncC->sLP.In_LP_State ) );
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}
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if( encControl->opusCanSwitch ) {
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/* Stop transition phase */
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psEncC->sLP.mode = 0;
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/* Switch to a lower sample frequency */
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fs_kHz = psEncC->fs_kHz == 16 ? 12 : 8;
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} else {
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if( psEncC->sLP.transition_frame_no <= 0 ) {
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encControl->switchReady = 1;
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/* Make room for redundancy */
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encControl->maxBits -= encControl->maxBits * 5 / ( encControl->payloadSize_ms + 5 );
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} else {
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/* Direction: down (at double speed) */
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psEncC->sLP.mode = -2;
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}
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}
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}
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else
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/* Check if we should switch up */
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if( silk_SMULBB( psEncC->fs_kHz, 1000 ) < psEncC->desiredInternal_fs_Hz )
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{
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/* Switch up */
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if( encControl->opusCanSwitch ) {
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/* Switch to a higher sample frequency */
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fs_kHz = psEncC->fs_kHz == 8 ? 12 : 16;
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/* New transition */
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psEncC->sLP.transition_frame_no = 0;
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/* Reset transition filter state */
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silk_memset( psEncC->sLP.In_LP_State, 0, sizeof( psEncC->sLP.In_LP_State ) );
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/* Direction: up */
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psEncC->sLP.mode = 1;
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} else {
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if( psEncC->sLP.mode == 0 ) {
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encControl->switchReady = 1;
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/* Make room for redundancy */
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encControl->maxBits -= encControl->maxBits * 5 / ( encControl->payloadSize_ms + 5 );
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} else {
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/* Direction: up */
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psEncC->sLP.mode = 1;
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}
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}
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} else {
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if (psEncC->sLP.mode<0)
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psEncC->sLP.mode = 1;
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}
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}
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}
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return fs_kHz;
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}
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