mirror of
https://github.com/Relintai/pandemonium_engine.git
synced 2024-12-23 12:26:59 +01:00
77 lines
3.4 KiB
C
77 lines
3.4 KiB
C
|
/***********************************************************************
|
||
|
|
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 SNR of redidual quantizer */
|
||
|
|
opus_int silk_control_SNR(
|
||
|
|
silk_encoder_state *psEncC, /* I/O Pointer to Silk encoder state */
|
||
|
|
opus_int32 TargetRate_bps /* I Target max bitrate (bps) */
|
||
|
|
)
|
||
|
|
{
|
||
|
|
opus_int k, ret = SILK_NO_ERROR;
|
||
|
|
opus_int32 frac_Q6;
|
||
|
|
const opus_int32 *rateTable;
|
||
|
|
|
||
|
|
/* Set bitrate/coding quality */
|
||
|
|
TargetRate_bps = silk_LIMIT( TargetRate_bps, MIN_TARGET_RATE_BPS, MAX_TARGET_RATE_BPS );
|
||
|
|
if( TargetRate_bps != psEncC->TargetRate_bps ) {
|
||
|
|
psEncC->TargetRate_bps = TargetRate_bps;
|
||
|
|
|
||
|
|
/* If new TargetRate_bps, translate to SNR_dB value */
|
||
|
|
if( psEncC->fs_kHz == 8 ) {
|
||
|
|
rateTable = silk_TargetRate_table_NB;
|
||
|
|
} else if( psEncC->fs_kHz == 12 ) {
|
||
|
|
rateTable = silk_TargetRate_table_MB;
|
||
|
|
} else {
|
||
|
|
rateTable = silk_TargetRate_table_WB;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Reduce bitrate for 10 ms modes in these calculations */
|
||
|
|
if( psEncC->nb_subfr == 2 ) {
|
||
|
|
TargetRate_bps -= REDUCE_BITRATE_10_MS_BPS;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Find bitrate interval in table and interpolate */
|
||
|
|
for( k = 1; k < TARGET_RATE_TAB_SZ; k++ ) {
|
||
|
|
if( TargetRate_bps <= rateTable[ k ] ) {
|
||
|
|
frac_Q6 = silk_DIV32( silk_LSHIFT( TargetRate_bps - rateTable[ k - 1 ], 6 ),
|
||
|
|
rateTable[ k ] - rateTable[ k - 1 ] );
|
||
|
|
psEncC->SNR_dB_Q7 = silk_LSHIFT( silk_SNR_table_Q1[ k - 1 ], 6 ) + silk_MUL( frac_Q6, silk_SNR_table_Q1[ k ] - silk_SNR_table_Q1[ k - 1 ] );
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|