diff options
Diffstat (limited to 'silk/PLC.c')
| -rw-r--r-- | silk/PLC.c | 66 |
1 files changed, 44 insertions, 22 deletions
@@ -46,7 +46,8 @@ static OPUS_INLINE void silk_PLC_update( static OPUS_INLINE void silk_PLC_conceal( silk_decoder_state *psDec, /* I/O Decoder state */ silk_decoder_control *psDecCtrl, /* I/O Decoder control */ - opus_int16 frame[] /* O LPC residual signal */ + opus_int16 frame[], /* O LPC residual signal */ + int arch /* I Run-time architecture */ ); @@ -65,7 +66,8 @@ void silk_PLC( silk_decoder_state *psDec, /* I/O Decoder state */ silk_decoder_control *psDecCtrl, /* I/O Decoder control */ opus_int16 frame[], /* I/O signal */ - opus_int lost /* I Loss flag */ + opus_int lost, /* I Loss flag */ + int arch /* I Run-time architecture */ ) { /* PLC control function */ @@ -78,7 +80,7 @@ void silk_PLC( /****************************/ /* Generate Signal */ /****************************/ - silk_PLC_conceal( psDec, psDecCtrl, frame ); + silk_PLC_conceal( psDec, psDecCtrl, frame, arch ); psDec->lossCnt++; } else { @@ -165,10 +167,35 @@ static OPUS_INLINE void silk_PLC_update( psPLC->nb_subfr = psDec->nb_subfr; } +static OPUS_INLINE void silk_PLC_energy(opus_int32 *energy1, opus_int *shift1, opus_int32 *energy2, opus_int *shift2, + const opus_int32 *exc_Q14, const opus_int32 *prevGain_Q10, int subfr_length, int nb_subfr) +{ + int i, k; + VARDECL( opus_int16, exc_buf ); + opus_int16 *exc_buf_ptr; + SAVE_STACK; + ALLOC( exc_buf, 2*subfr_length, opus_int16 ); + /* Find random noise component */ + /* Scale previous excitation signal */ + exc_buf_ptr = exc_buf; + for( k = 0; k < 2; k++ ) { + for( i = 0; i < subfr_length; i++ ) { + exc_buf_ptr[ i ] = (opus_int16)silk_SAT16( silk_RSHIFT( + silk_SMULWW( exc_Q14[ i + ( k + nb_subfr - 2 ) * subfr_length ], prevGain_Q10[ k ] ), 8 ) ); + } + exc_buf_ptr += subfr_length; + } + /* Find the subframe with lowest energy of the last two and use that as random noise generator */ + silk_sum_sqr_shift( energy1, shift1, exc_buf, subfr_length ); + silk_sum_sqr_shift( energy2, shift2, &exc_buf[ subfr_length ], subfr_length ); + RESTORE_STACK; +} + static OPUS_INLINE void silk_PLC_conceal( silk_decoder_state *psDec, /* I/O Decoder state */ silk_decoder_control *psDecCtrl, /* I/O Decoder control */ - opus_int16 frame[] /* O LPC residual signal */ + opus_int16 frame[], /* O LPC residual signal */ + int arch /* I Run-time architecture */ ) { opus_int i, j, k; @@ -177,19 +204,26 @@ static OPUS_INLINE void silk_PLC_conceal( opus_int32 energy1, energy2, *rand_ptr, *pred_lag_ptr; opus_int32 LPC_pred_Q10, LTP_pred_Q12; opus_int16 rand_scale_Q14; - opus_int16 *B_Q14, *exc_buf_ptr; + opus_int16 *B_Q14; opus_int32 *sLPC_Q14_ptr; - VARDECL( opus_int16, exc_buf ); opus_int16 A_Q12[ MAX_LPC_ORDER ]; +#ifdef SMALL_FOOTPRINT + opus_int16 *sLTP; +#else VARDECL( opus_int16, sLTP ); +#endif VARDECL( opus_int32, sLTP_Q14 ); silk_PLC_struct *psPLC = &psDec->sPLC; opus_int32 prevGain_Q10[2]; SAVE_STACK; - ALLOC( exc_buf, 2*psPLC->subfr_length, opus_int16 ); - ALLOC( sLTP, psDec->ltp_mem_length, opus_int16 ); ALLOC( sLTP_Q14, psDec->ltp_mem_length + psDec->frame_length, opus_int32 ); +#ifdef SMALL_FOOTPRINT + /* Ugly hack that breaks aliasing rules to save stack: put sLTP at the very end of sLTP_Q14. */ + sLTP = ((opus_int16*)&sLTP_Q14[psDec->ltp_mem_length + psDec->frame_length])-psDec->ltp_mem_length; +#else + ALLOC( sLTP, psDec->ltp_mem_length, opus_int16 ); +#endif prevGain_Q10[0] = silk_RSHIFT( psPLC->prevGain_Q16[ 0 ], 6); prevGain_Q10[1] = silk_RSHIFT( psPLC->prevGain_Q16[ 1 ], 6); @@ -198,19 +232,7 @@ static OPUS_INLINE void silk_PLC_conceal( silk_memset( psPLC->prevLPC_Q12, 0, sizeof( psPLC->prevLPC_Q12 ) ); } - /* Find random noise component */ - /* Scale previous excitation signal */ - exc_buf_ptr = exc_buf; - for( k = 0; k < 2; k++ ) { - for( i = 0; i < psPLC->subfr_length; i++ ) { - exc_buf_ptr[ i ] = (opus_int16)silk_SAT16( silk_RSHIFT( - silk_SMULWW( psDec->exc_Q14[ i + ( k + psPLC->nb_subfr - 2 ) * psPLC->subfr_length ], prevGain_Q10[ k ] ), 8 ) ); - } - exc_buf_ptr += psPLC->subfr_length; - } - /* Find the subframe with lowest energy of the last two and use that as random noise generator */ - silk_sum_sqr_shift( &energy1, &shift1, exc_buf, psPLC->subfr_length ); - silk_sum_sqr_shift( &energy2, &shift2, &exc_buf[ psPLC->subfr_length ], psPLC->subfr_length ); + silk_PLC_energy(&energy1, &shift1, &energy2, &shift2, psDec->exc_Q14, prevGain_Q10, psDec->subfr_length, psDec->nb_subfr); if( silk_RSHIFT( energy1, shift2 ) < silk_RSHIFT( energy2, shift1 ) ) { /* First sub-frame has lowest energy */ @@ -270,7 +292,7 @@ static OPUS_INLINE void silk_PLC_conceal( /* Rewhiten LTP state */ idx = psDec->ltp_mem_length - lag - psDec->LPC_order - LTP_ORDER / 2; silk_assert( idx > 0 ); - silk_LPC_analysis_filter( &sLTP[ idx ], &psDec->outBuf[ idx ], A_Q12, psDec->ltp_mem_length - idx, psDec->LPC_order ); + silk_LPC_analysis_filter( &sLTP[ idx ], &psDec->outBuf[ idx ], A_Q12, psDec->ltp_mem_length - idx, psDec->LPC_order, arch ); /* Scale LTP state */ inv_gain_Q30 = silk_INVERSE32_varQ( psPLC->prevGain_Q16[ 1 ], 46 ); inv_gain_Q30 = silk_min( inv_gain_Q30, silk_int32_MAX >> 1 ); |