[Opus] Update to v1.2.1

third_party/opus/src/silk/float/pitch_analysis_core_FLP.c

 /***********************************************************************
 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.
@@ skipping 141 matching lines @@
         silk_float2short_array( frame_8_FIX, frame, frame_length_8kHz );
     }
 
     /* Decimate again to 4 kHz */
     silk_memset( filt_state, 0, 2 * sizeof( opus_int32 ) );
     silk_resampler_down2( filt_state, frame_4_FIX, frame_8_FIX, frame_length_8kHz );
     silk_short2float_array( frame_4kHz, frame_4_FIX, frame_length_4kHz );
 
     /* Low-pass filter */
     for( i = frame_length_4kHz - 1; i > 0; i-- ) {
-        frame_4kHz[ i ] += frame_4kHz[ i - 1 ];
+        frame_4kHz[ i ] = silk_ADD_SAT16( frame_4kHz[ i ], frame_4kHz[ i - 1 ] );
     }
 
     /******************************************************************************
     * FIRST STAGE, operating in 4 khz
     ******************************************************************************/
     silk_memset(C, 0, sizeof(silk_float) * nb_subfr * ((PE_MAX_LAG >> 1) + 5));
     target_ptr = &frame_4kHz[ silk_LSHIFT( sf_length_4kHz, 2 ) ];
     for( k = 0; k < nb_subfr >> 1; k++ ) {
         /* Check that we are within range of the array */
         silk_assert( target_ptr >= frame_4kHz );
@@ skipping 448 matching lines @@
             for( j = 0; j < PE_NB_STAGE3_LAGS; j++ ) {
                 silk_assert( idx + j < SCRATCH_SIZE );
                 silk_assert( idx + j < lag_counter );
                 energies_st3[ k ][ i ][ j ] = scratch_mem[ idx + j ];
                 silk_assert( energies_st3[ k ][ i ][ j ] >= 0.0f );
             }
         }
         target_ptr += sf_length;
     }
 }