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 OPUS_HAVE_CONFIG_H
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#include "opus_config.h"
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#endif
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#include "silk_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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