diff options
Diffstat (limited to 'src/opus-1.0.2/silk/control_SNR.c')
| -rw-r--r-- | src/opus-1.0.2/silk/control_SNR.c | 81 |
1 files changed, 0 insertions, 81 deletions
diff --git a/src/opus-1.0.2/silk/control_SNR.c b/src/opus-1.0.2/silk/control_SNR.c deleted file mode 100644 index 08e4e1a1..00000000 --- a/src/opus-1.0.2/silk/control_SNR.c +++ /dev/null @@ -1,81 +0,0 @@ -/*********************************************************************** -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; - } - } - - /* Reduce coding quality whenever LBRR is enabled, to free up some bits */ - if( psEncC->LBRR_enabled ) { - psEncC->SNR_dB_Q7 = silk_SMLABB( psEncC->SNR_dB_Q7, 12 - psEncC->LBRR_GainIncreases, SILK_FIX_CONST( -0.25, 7 ) ); - } - } - - return ret; -} |