diff options
| -rw-r--r-- | silk/control_audio_bandwidth.c | 16 | ||||
| -rw-r--r-- | silk/enc_API.c | 10 | ||||
| -rw-r--r-- | silk/structs.h | 1 | ||||
| -rw-r--r-- | src/opus_encoder.c | 7 |
4 files changed, 27 insertions, 7 deletions
diff --git a/silk/control_audio_bandwidth.c b/silk/control_audio_bandwidth.c index 4f9bc5cb..f6d22d83 100644 --- a/silk/control_audio_bandwidth.c +++ b/silk/control_audio_bandwidth.c @@ -39,9 +39,15 @@ opus_int silk_control_audio_bandwidth( ) { opus_int fs_kHz; + opus_int orig_kHz; opus_int32 fs_Hz; - fs_kHz = psEncC->fs_kHz; + orig_kHz = psEncC->fs_kHz; + /* Handle a bandwidth-switching reset where we need to be aware what the last sampling rate was. */ + if( orig_kHz == 0 ) { + orig_kHz = psEncC->sLP.saved_fs_kHz; + } + fs_kHz = orig_kHz; fs_Hz = silk_SMULBB( fs_kHz, 1000 ); if( fs_Hz == 0 ) { /* Encoder has just been initialized */ @@ -61,7 +67,7 @@ opus_int silk_control_audio_bandwidth( } if( psEncC->allow_bandwidth_switch || encControl->opusCanSwitch ) { /* Check if we should switch down */ - if( silk_SMULBB( psEncC->fs_kHz, 1000 ) > psEncC->desiredInternal_fs_Hz ) + if( silk_SMULBB( orig_kHz, 1000 ) > psEncC->desiredInternal_fs_Hz ) { /* Switch down */ if( psEncC->sLP.mode == 0 ) { @@ -76,7 +82,7 @@ opus_int silk_control_audio_bandwidth( psEncC->sLP.mode = 0; /* Switch to a lower sample frequency */ - fs_kHz = psEncC->fs_kHz == 16 ? 12 : 8; + fs_kHz = orig_kHz == 16 ? 12 : 8; } else { if( psEncC->sLP.transition_frame_no <= 0 ) { encControl->switchReady = 1; @@ -90,12 +96,12 @@ opus_int silk_control_audio_bandwidth( } else /* Check if we should switch up */ - if( silk_SMULBB( psEncC->fs_kHz, 1000 ) < psEncC->desiredInternal_fs_Hz ) + if( silk_SMULBB( orig_kHz, 1000 ) < psEncC->desiredInternal_fs_Hz ) { /* Switch up */ if( encControl->opusCanSwitch ) { /* Switch to a higher sample frequency */ - fs_kHz = psEncC->fs_kHz == 8 ? 12 : 16; + fs_kHz = orig_kHz == 8 ? 12 : 16; /* New transition */ psEncC->sLP.transition_frame_no = 0; diff --git a/silk/enc_API.c b/silk/enc_API.c index 7ae31a9e..55a33f37 100644 --- a/silk/enc_API.c +++ b/silk/enc_API.c @@ -200,15 +200,25 @@ opus_int silk_Encode( /* O Returns error co tot_blocks = ( nBlocksOf10ms > 1 ) ? nBlocksOf10ms >> 1 : 1; curr_block = 0; if( prefillFlag ) { + silk_LP_state save_LP; /* Only accept input length of 10 ms */ if( nBlocksOf10ms != 1 ) { celt_assert( 0 ); RESTORE_STACK; return SILK_ENC_INPUT_INVALID_NO_OF_SAMPLES; } + if ( prefillFlag == 2 ) { + save_LP = psEnc->state_Fxx[ 0 ].sCmn.sLP; + /* Save the sampling rate so the bandwidth switching code can keep handling transitions. */ + save_LP.saved_fs_kHz = psEnc->state_Fxx[ 0 ].sCmn.fs_kHz; + } /* Reset Encoder */ for( n = 0; n < encControl->nChannelsInternal; n++ ) { ret = silk_init_encoder( &psEnc->state_Fxx[ n ], psEnc->state_Fxx[ n ].sCmn.arch ); + /* Restore the variable LP state. */ + if ( prefillFlag == 2 ) { + psEnc->state_Fxx[ n ].sCmn.sLP = save_LP; + } celt_assert( !ret ); } tmp_payloadSize_ms = encControl->payloadSize_ms; diff --git a/silk/structs.h b/silk/structs.h index 4ff590b0..3380c757 100644 --- a/silk/structs.h +++ b/silk/structs.h @@ -78,6 +78,7 @@ typedef struct { opus_int32 In_LP_State[ 2 ]; /* Low pass filter state */ opus_int32 transition_frame_no; /* Counter which is mapped to a cut-off frequency */ opus_int mode; /* Operating mode, <0: switch down, >0: switch up; 0: do nothing */ + opus_int32 saved_fs_kHz; /* If non-zero, holds the last sampling rate before a bandwidth switching reset. */ } silk_LP_state; /* Structure containing NLSF codebook */ diff --git a/src/opus_encoder.c b/src/opus_encoder.c index 0be65a3d..e6cca901 100644 --- a/src/opus_encoder.c +++ b/src/opus_encoder.c @@ -1599,7 +1599,8 @@ opus_int32 opus_encode_native(OpusEncoder *st, const opus_val16 *pcm, int frame_ redundancy = 1; celt_to_silk = 1; st->silk_bw_switch = 0; - prefill=1; + /* Do a prefill without reseting the sampling rate control. */ + prefill=2; } /* If we decided to go with CELT, make sure redundancy is off, no matter what @@ -1825,7 +1826,9 @@ opus_int32 opus_encode_native(OpusEncoder *st, const opus_val16 *pcm, int frame_ for (i=0;i<st->encoder_buffer*st->channels;i++) pcm_silk[i] = FLOAT2INT16(st->delay_buffer[i]); #endif - silk_Encode( silk_enc, &st->silk_mode, pcm_silk, st->encoder_buffer, NULL, &zero, 1, activity ); + silk_Encode( silk_enc, &st->silk_mode, pcm_silk, st->encoder_buffer, NULL, &zero, prefill, activity ); + /* Prevent a second switch in the real encode call. */ + st->silk_mode.opusCanSwitch = 0; } #ifdef FIXED_POINT |