diff options
Diffstat (limited to 'thirdparty/opus/silk/control_SNR.c')
| -rw-r--r-- | thirdparty/opus/silk/control_SNR.c | 103 |
1 files changed, 33 insertions, 70 deletions
diff --git a/thirdparty/opus/silk/control_SNR.c b/thirdparty/opus/silk/control_SNR.c index 9a6db27543..cee87eb0d8 100644 --- a/thirdparty/opus/silk/control_SNR.c +++ b/thirdparty/opus/silk/control_SNR.c @@ -32,82 +32,45 @@ POSSIBILITY OF SUCH DAMAGE. #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; + opus_int k, ret = SILK_NO_ERROR; + opus_int32 frac_Q6; + const opus_int32 *rateTable; - 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; + /* 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 SILK_NO_ERROR; + + return ret; } |