| /*********************************************************************** |
| 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" |
| |
| /* These tables hold SNR values divided by 21 (so they fit in 8 bits) |
| for different target bitrates spaced at 400 bps interval. The first |
| 10 values are omitted (0-4 kb/s) because they're all zeros. |
| These tables were obtained by running different SNRs through the |
| encoder and measuring the active bitrate. */ |
| static const unsigned char silk_TargetRate_NB_21[117 - 10] = { |
| 0, 15, 39, 52, 61, 68, |
| 74, 79, 84, 88, 92, 95, 99,102,105,108,111,114,117,119,122,124, |
| 126,129,131,133,135,137,139,142,143,145,147,149,151,153,155,157, |
| 158,160,162,163,165,167,168,170,171,173,174,176,177,179,180,182, |
| 183,185,186,187,189,190,192,193,194,196,197,199,200,201,203,204, |
| 205,207,208,209,211,212,213,215,216,217,219,220,221,223,224,225, |
| 227,228,230,231,232,234,235,236,238,239,241,242,243,245,246,248, |
| 249,250,252,253,255 |
| }; |
| |
| static const unsigned char silk_TargetRate_MB_21[165 - 10] = { |
| 0, 0, 28, 43, 52, 59, |
| 65, 70, 74, 78, 81, 85, 87, 90, 93, 95, 98,100,102,105,107,109, |
| 111,113,115,116,118,120,122,123,125,127,128,130,131,133,134,136, |
| 137,138,140,141,143,144,145,147,148,149,151,152,153,154,156,157, |
| 158,159,160,162,163,164,165,166,167,168,169,171,172,173,174,175, |
| 176,177,178,179,180,181,182,183,184,185,186,187,188,188,189,190, |
| 191,192,193,194,195,196,197,198,199,200,201,202,203,203,204,205, |
| 206,207,208,209,210,211,212,213,214,214,215,216,217,218,219,220, |
| 221,222,223,224,224,225,226,227,228,229,230,231,232,233,234,235, |
| 236,236,237,238,239,240,241,242,243,244,245,246,247,248,249,250, |
| 251,252,253,254,255 |
| }; |
| |
| static const unsigned char silk_TargetRate_WB_21[201 - 10] = { |
| 0, 0, 0, 8, 29, 41, |
| 49, 56, 62, 66, 70, 74, 77, 80, 83, 86, 88, 91, 93, 95, 97, 99, |
| 101,103,105,107,108,110,112,113,115,116,118,119,121,122,123,125, |
| 126,127,129,130,131,132,134,135,136,137,138,140,141,142,143,144, |
| 145,146,147,148,149,150,151,152,153,154,156,157,158,159,159,160, |
| 161,162,163,164,165,166,167,168,169,170,171,171,172,173,174,175, |
| 176,177,177,178,179,180,181,181,182,183,184,185,185,186,187,188, |
| 189,189,190,191,192,192,193,194,195,195,196,197,198,198,199,200, |
| 200,201,202,203,203,204,205,206,206,207,208,209,209,210,211,211, |
| 212,213,214,214,215,216,216,217,218,219,219,220,221,221,222,223, |
| 224,224,225,226,226,227,228,229,229,230,231,232,232,233,234,234, |
| 235,236,237,237,238,239,240,240,241,242,243,243,244,245,246,246, |
| 247,248,249,249,250,251,252,253,255 |
| }; |
| |
| /* 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) */ |
| ) |
| { |
| int id; |
| int bound; |
| const unsigned char *snr_table; |
| |
| psEncC->TargetRate_bps = TargetRate_bps; |
| if( psEncC->nb_subfr == 2 ) { |
| TargetRate_bps -= 2000 + psEncC->fs_kHz/16; |
| } |
| if( psEncC->fs_kHz == 8 ) { |
| bound = sizeof(silk_TargetRate_NB_21); |
| snr_table = silk_TargetRate_NB_21; |
| } else if( psEncC->fs_kHz == 12 ) { |
| bound = sizeof(silk_TargetRate_MB_21); |
| snr_table = silk_TargetRate_MB_21; |
| } else { |
| bound = sizeof(silk_TargetRate_WB_21); |
| snr_table = silk_TargetRate_WB_21; |
| } |
| id = (TargetRate_bps+200)/400; |
| id = silk_min(id - 10, bound-1); |
| if( id <= 0 ) { |
| psEncC->SNR_dB_Q7 = 0; |
| } else { |
| psEncC->SNR_dB_Q7 = snr_table[id]*21; |
| } |
| return SILK_NO_ERROR; |
| } |
