cannam@154: /*********************************************************************** cannam@154: Copyright (c) 2006-2011, Skype Limited. All rights reserved. cannam@154: Redistribution and use in source and binary forms, with or without cannam@154: modification, are permitted provided that the following conditions cannam@154: are met: cannam@154: - Redistributions of source code must retain the above copyright notice, cannam@154: this list of conditions and the following disclaimer. cannam@154: - Redistributions in binary form must reproduce the above copyright cannam@154: notice, this list of conditions and the following disclaimer in the cannam@154: documentation and/or other materials provided with the distribution. cannam@154: - Neither the name of Internet Society, IETF or IETF Trust, nor the cannam@154: names of specific contributors, may be used to endorse or promote cannam@154: products derived from this software without specific prior written cannam@154: permission. cannam@154: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" cannam@154: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE cannam@154: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE cannam@154: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE cannam@154: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR cannam@154: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF cannam@154: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS cannam@154: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN cannam@154: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) cannam@154: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE cannam@154: POSSIBILITY OF SUCH DAMAGE. cannam@154: ***********************************************************************/ cannam@154: cannam@154: #ifdef HAVE_CONFIG_H cannam@154: #include "config.h" cannam@154: #endif cannam@154: cannam@154: #include "main.h" cannam@154: #include "tuning_parameters.h" cannam@154: cannam@154: /* These tables hold SNR values divided by 21 (so they fit in 8 bits) cannam@154: for different target bitrates spaced at 400 bps interval. The first cannam@154: 10 values are omitted (0-4 kb/s) because they're all zeros. cannam@154: These tables were obtained by running different SNRs through the cannam@154: encoder and measuring the active bitrate. */ cannam@154: static const unsigned char silk_TargetRate_NB_21[117 - 10] = { cannam@154: 0, 15, 39, 52, 61, 68, cannam@154: 74, 79, 84, 88, 92, 95, 99,102,105,108,111,114,117,119,122,124, cannam@154: 126,129,131,133,135,137,139,142,143,145,147,149,151,153,155,157, cannam@154: 158,160,162,163,165,167,168,170,171,173,174,176,177,179,180,182, cannam@154: 183,185,186,187,189,190,192,193,194,196,197,199,200,201,203,204, cannam@154: 205,207,208,209,211,212,213,215,216,217,219,220,221,223,224,225, cannam@154: 227,228,230,231,232,234,235,236,238,239,241,242,243,245,246,248, cannam@154: 249,250,252,253,255 cannam@154: }; cannam@154: cannam@154: static const unsigned char silk_TargetRate_MB_21[165 - 10] = { cannam@154: 0, 0, 28, 43, 52, 59, cannam@154: 65, 70, 74, 78, 81, 85, 87, 90, 93, 95, 98,100,102,105,107,109, cannam@154: 111,113,115,116,118,120,122,123,125,127,128,130,131,133,134,136, cannam@154: 137,138,140,141,143,144,145,147,148,149,151,152,153,154,156,157, cannam@154: 158,159,160,162,163,164,165,166,167,168,169,171,172,173,174,175, cannam@154: 176,177,178,179,180,181,182,183,184,185,186,187,188,188,189,190, cannam@154: 191,192,193,194,195,196,197,198,199,200,201,202,203,203,204,205, cannam@154: 206,207,208,209,210,211,212,213,214,214,215,216,217,218,219,220, cannam@154: 221,222,223,224,224,225,226,227,228,229,230,231,232,233,234,235, cannam@154: 236,236,237,238,239,240,241,242,243,244,245,246,247,248,249,250, cannam@154: 251,252,253,254,255 cannam@154: }; cannam@154: cannam@154: static const unsigned char silk_TargetRate_WB_21[201 - 10] = { cannam@154: 0, 0, 0, 8, 29, 41, cannam@154: 49, 56, 62, 66, 70, 74, 77, 80, 83, 86, 88, 91, 93, 95, 97, 99, cannam@154: 101,103,105,107,108,110,112,113,115,116,118,119,121,122,123,125, cannam@154: 126,127,129,130,131,132,134,135,136,137,138,140,141,142,143,144, cannam@154: 145,146,147,148,149,150,151,152,153,154,156,157,158,159,159,160, cannam@154: 161,162,163,164,165,166,167,168,169,170,171,171,172,173,174,175, cannam@154: 176,177,177,178,179,180,181,181,182,183,184,185,185,186,187,188, cannam@154: 189,189,190,191,192,192,193,194,195,195,196,197,198,198,199,200, cannam@154: 200,201,202,203,203,204,205,206,206,207,208,209,209,210,211,211, cannam@154: 212,213,214,214,215,216,216,217,218,219,219,220,221,221,222,223, cannam@154: 224,224,225,226,226,227,228,229,229,230,231,232,232,233,234,234, cannam@154: 235,236,237,237,238,239,240,240,241,242,243,243,244,245,246,246, cannam@154: 247,248,249,249,250,251,252,253,255 cannam@154: }; cannam@154: cannam@154: /* Control SNR of redidual quantizer */ cannam@154: opus_int silk_control_SNR( cannam@154: silk_encoder_state *psEncC, /* I/O Pointer to Silk encoder state */ cannam@154: opus_int32 TargetRate_bps /* I Target max bitrate (bps) */ cannam@154: ) cannam@154: { cannam@154: int id; cannam@154: int bound; cannam@154: const unsigned char *snr_table; cannam@154: cannam@154: psEncC->TargetRate_bps = TargetRate_bps; cannam@154: if( psEncC->nb_subfr == 2 ) { cannam@154: TargetRate_bps -= 2000 + psEncC->fs_kHz/16; cannam@154: } cannam@154: if( psEncC->fs_kHz == 8 ) { cannam@154: bound = sizeof(silk_TargetRate_NB_21); cannam@154: snr_table = silk_TargetRate_NB_21; cannam@154: } else if( psEncC->fs_kHz == 12 ) { cannam@154: bound = sizeof(silk_TargetRate_MB_21); cannam@154: snr_table = silk_TargetRate_MB_21; cannam@154: } else { cannam@154: bound = sizeof(silk_TargetRate_WB_21); cannam@154: snr_table = silk_TargetRate_WB_21; cannam@154: } cannam@154: id = (TargetRate_bps+200)/400; cannam@154: id = silk_min(id - 10, bound-1); cannam@154: if( id <= 0 ) { cannam@154: psEncC->SNR_dB_Q7 = 0; cannam@154: } else { cannam@154: psEncC->SNR_dB_Q7 = snr_table[id]*21; cannam@154: } cannam@154: return SILK_NO_ERROR; cannam@154: }