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- #ifdef HAVE_CONFIG_H
- #include "config.h"
- #endif
- #include "SigProc_FIX.h"
- opus_int32 silk_log2lin(
- const opus_int32 inLog_Q7
- )
- {
- opus_int32 out, frac_Q7;
- if( inLog_Q7 < 0 ) {
- return 0;
- } else if ( inLog_Q7 >= 3967 ) {
- return silk_int32_MAX;
- }
- out = silk_LSHIFT( 1, silk_RSHIFT( inLog_Q7, 7 ) );
- frac_Q7 = inLog_Q7 & 0x7F;
- if( inLog_Q7 < 2048 ) {
-
- out = silk_ADD_RSHIFT32( out, silk_MUL( out, silk_SMLAWB( frac_Q7, silk_SMULBB( frac_Q7, 128 - frac_Q7 ), -174 ) ), 7 );
- } else {
-
- out = silk_MLA( out, silk_RSHIFT( out, 7 ), silk_SMLAWB( frac_Q7, silk_SMULBB( frac_Q7, 128 - frac_Q7 ), -174 ) );
- }
- return out;
- }
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