shithub: opus

Info  •  Files  •  Log  •  Branches

Disable the LPC mode highpass filter when set to APPLICATION_AUDIO.

--- a/silk/silk_enc_API.c

+++ b/silk/silk_enc_API.c

@@ -302,9 +302,11 @@

                 }

             }

-            /* High-pass filter */

-            psEnc->state_Fxx[ 0 ].sCmn.HP_cutoff_Hz = encControl->HP_cutoff_Hz;

-            silk_HP_variable_cutoff( psEnc->state_Fxx, psEnc->nChannelsInternal );

+            /* High-pass filter, deactivated if less than zero */

+            if(encControl->HP_cutoff_Hz>=0) {

+                psEnc->state_Fxx[ 0 ].sCmn.HP_cutoff_Hz = encControl->HP_cutoff_Hz;

+                silk_HP_variable_cutoff( psEnc->state_Fxx, psEnc->nChannelsInternal );

+            }

             /* Total target bits for packet */

             nBits = SKP_DIV32_16( SKP_MUL( encControl->bitRate, encControl->payloadSize_ms ), 1000 );

--- a/src/opus_encoder.c

+++ b/src/opus_encoder.c

@@ -326,7 +326,10 @@

     /* Mode selection depending on application and signal type */

     if (st->application==OPUS_APPLICATION_VOIP)

     {

-        opus_int32 threshold = 20000;

+        opus_int32 threshold;

+        threshold = 20000;

+        /* OPUS_APPLICATION_VOIP default to auto high-pass */

+        st->silk_mode.HP_cutoff_Hz=0;

         /* Hysteresis */

         if (st->prev_mode == MODE_CELT_ONLY)

             threshold -= 4000;

@@ -342,6 +345,8 @@

         opus_int32 threshold;

         /* SILK/CELT threshold is higher for voice than for music */

         threshold = 36000;

+        /* OPUS_APPLICATION_AUDIO disables the high-pass */

+        st->silk_mode.HP_cutoff_Hz=-1;

         if (st->signal_type == OPUS_SIGNAL_MUSIC)

             threshold -= 20000;

         else if (st->signal_type == OPUS_SIGNAL_VOICE)