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