Line data    Source code

       1             : /***********************************************************************
       2             : Copyright (c) 2006-2011, Skype Limited. All rights reserved.
       3             : Redistribution and use in source and binary forms, with or without
       4             : modification, are permitted provided that the following conditions
       5             : are met:
       6             : - Redistributions of source code must retain the above copyright notice,
       7             : this list of conditions and the following disclaimer.
       8             : - Redistributions in binary form must reproduce the above copyright
       9             : notice, this list of conditions and the following disclaimer in the
      10             : documentation and/or other materials provided with the distribution.
      11             : - Neither the name of Internet Society, IETF or IETF Trust, nor the
      12             : names of specific contributors, may be used to endorse or promote
      13             : products derived from this software without specific prior written
      14             : permission.
      15             : THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
      16             : AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
      17             : IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
      18             : ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
      19             : LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
      20             : CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
      21             : SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
      22             : INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
      23             : CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
      24             : ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
      25             : POSSIBILITY OF SUCH DAMAGE.
      26             : ***********************************************************************/
      27             : 
      28             : #ifdef HAVE_CONFIG_H
      29             : #include "config.h"
      30             : #endif
      31             : 
      32             : #include "main.h"
      33             : #include "tuning_parameters.h"
      34             : 
      35             : /* Control SNR of redidual quantizer */
      36           0 : opus_int silk_control_SNR(
      37             :     silk_encoder_state          *psEncC,                        /* I/O  Pointer to Silk encoder state               */
      38             :     opus_int32                  TargetRate_bps                  /* I    Target max bitrate (bps)                    */
      39             : )
      40             : {
      41           0 :     opus_int k, ret = SILK_NO_ERROR;
      42             :     opus_int32 frac_Q6;
      43             :     const opus_int32 *rateTable;
      44             : 
      45             :     /* Set bitrate/coding quality */
      46           0 :     TargetRate_bps = silk_LIMIT( TargetRate_bps, MIN_TARGET_RATE_BPS, MAX_TARGET_RATE_BPS );
      47           0 :     if( TargetRate_bps != psEncC->TargetRate_bps ) {
      48           0 :         psEncC->TargetRate_bps = TargetRate_bps;
      49             : 
      50             :         /* If new TargetRate_bps, translate to SNR_dB value */
      51           0 :         if( psEncC->fs_kHz == 8 ) {
      52           0 :             rateTable = silk_TargetRate_table_NB;
      53           0 :         } else if( psEncC->fs_kHz == 12 ) {
      54           0 :             rateTable = silk_TargetRate_table_MB;
      55             :         } else {
      56           0 :             rateTable = silk_TargetRate_table_WB;
      57             :         }
      58             : 
      59             :         /* Reduce bitrate for 10 ms modes in these calculations */
      60           0 :         if( psEncC->nb_subfr == 2 ) {
      61           0 :             TargetRate_bps -= REDUCE_BITRATE_10_MS_BPS;
      62             :         }
      63             : 
      64             :         /* Find bitrate interval in table and interpolate */
      65           0 :         for( k = 1; k < TARGET_RATE_TAB_SZ; k++ ) {
      66           0 :             if( TargetRate_bps <= rateTable[ k ] ) {
      67           0 :                 frac_Q6 = silk_DIV32( silk_LSHIFT( TargetRate_bps - rateTable[ k - 1 ], 6 ), rateTable[ k ] - rateTable[ k - 1 ] );
      68           0 :                 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 ] );
      69           0 :                 break;
      70             :             }
      71             :         }
      72             :     }
      73             : 
      74           0 :     return ret;
      75             : }