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3 Redistribution and use in source and binary forms, with or without
4 modification, are permitted provided that the following conditions
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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
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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
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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
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18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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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 /* These tables hold SNR values divided by 21 (so they fit in 8 bits)
36 for different target bitrates spaced at 400 bps interval. The first
37 10 values are omitted (0-4 kb/s) because they're all zeros.
38 These tables were obtained by running different SNRs through the
39 encoder and measuring the active bitrate. */
40 static const unsigned char silk_TargetRate_NB_21[117 - 10] = {
41 0, 15, 39, 52, 61, 68,
42 74, 79, 84, 88, 92, 95, 99,102,105,108,111,114,117,119,122,124,
43 126,129,131,133,135,137,139,142,143,145,147,149,151,153,155,157,
44 158,160,162,163,165,167,168,170,171,173,174,176,177,179,180,182,
45 183,185,186,187,189,190,192,193,194,196,197,199,200,201,203,204,
46 205,207,208,209,211,212,213,215,216,217,219,220,221,223,224,225,
47 227,228,230,231,232,234,235,236,238,239,241,242,243,245,246,248,
48 249,250,252,253,255
49 };
50
51 static const unsigned char silk_TargetRate_MB_21[165 - 10] = {
52 0, 0, 28, 43, 52, 59,
53 65, 70, 74, 78, 81, 85, 87, 90, 93, 95, 98,100,102,105,107,109,
54 111,113,115,116,118,120,122,123,125,127,128,130,131,133,134,136,
55 137,138,140,141,143,144,145,147,148,149,151,152,153,154,156,157,
56 158,159,160,162,163,164,165,166,167,168,169,171,172,173,174,175,
57 176,177,178,179,180,181,182,183,184,185,186,187,188,188,189,190,
58 191,192,193,194,195,196,197,198,199,200,201,202,203,203,204,205,
59 206,207,208,209,210,211,212,213,214,214,215,216,217,218,219,220,
60 221,222,223,224,224,225,226,227,228,229,230,231,232,233,234,235,
61 236,236,237,238,239,240,241,242,243,244,245,246,247,248,249,250,
62 251,252,253,254,255
63 };
64
65 static const unsigned char silk_TargetRate_WB_21[201 - 10] = {
66 0, 0, 0, 8, 29, 41,
67 49, 56, 62, 66, 70, 74, 77, 80, 83, 86, 88, 91, 93, 95, 97, 99,
68 101,103,105,107,108,110,112,113,115,116,118,119,121,122,123,125,
69 126,127,129,130,131,132,134,135,136,137,138,140,141,142,143,144,
70 145,146,147,148,149,150,151,152,153,154,156,157,158,159,159,160,
71 161,162,163,164,165,166,167,168,169,170,171,171,172,173,174,175,
72 176,177,177,178,179,180,181,181,182,183,184,185,185,186,187,188,
73 189,189,190,191,192,192,193,194,195,195,196,197,198,198,199,200,
74 200,201,202,203,203,204,205,206,206,207,208,209,209,210,211,211,
75 212,213,214,214,215,216,216,217,218,219,219,220,221,221,222,223,
76 224,224,225,226,226,227,228,229,229,230,231,232,232,233,234,234,
77 235,236,237,237,238,239,240,240,241,242,243,243,244,245,246,246,
78 247,248,249,249,250,251,252,253,255
79 };
80
81 /* Control SNR of redidual quantizer */
silk_control_SNR(silk_encoder_state * psEncC,opus_int32 TargetRate_bps)82 opus_int silk_control_SNR(
83 silk_encoder_state *psEncC, /* I/O Pointer to Silk encoder state */
84 opus_int32 TargetRate_bps /* I Target max bitrate (bps) */
85 )
86 {
87 int id;
88 int bound;
89 const unsigned char *snr_table;
90
91 psEncC->TargetRate_bps = TargetRate_bps;
92 if( psEncC->nb_subfr == 2 ) {
93 TargetRate_bps -= 2000 + psEncC->fs_kHz/16;
94 }
95 if( psEncC->fs_kHz == 8 ) {
96 bound = sizeof(silk_TargetRate_NB_21);
97 snr_table = silk_TargetRate_NB_21;
98 } else if( psEncC->fs_kHz == 12 ) {
99 bound = sizeof(silk_TargetRate_MB_21);
100 snr_table = silk_TargetRate_MB_21;
101 } else {
102 bound = sizeof(silk_TargetRate_WB_21);
103 snr_table = silk_TargetRate_WB_21;
104 }
105 id = (TargetRate_bps+200)/400;
106 id = silk_min(id - 10, bound-1);
107 if( id <= 0 ) {
108 psEncC->SNR_dB_Q7 = 0;
109 } else {
110 psEncC->SNR_dB_Q7 = snr_table[id]*21;
111 }
112 return SILK_NO_ERROR;
113 }
114