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Fixes two SILK PLC issues

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- Calling the decoder for FEC when there's no LBRR should no longer crash
- There should no longer be an issue with the PLC on frame size switching
This commit is contained in:
Koen Vos 2011-10-28 21:05:22 -04:00 • committed by Jean-Marc Valin
parent acc7a6c78b
commit 0dbd0ca3e6
5 changed files with 25 additions and 18 deletions
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29
silk/PLC.c
View file

@ -54,6 +54,8 @@ void silk_PLC_Reset(
)
{
psDec->sPLC.pitchL_Q8 = silk_RSHIFT( psDec->frame_length, 1 );
psDec->sPLC.prevGain_Q16[ 0 ] = SILK_FIX_CONST( 1, 16 );
psDec->sPLC.prevGain_Q16[ 1 ] = SILK_FIX_CONST( 1, 16 );
}
void silk_PLC(
@ -155,8 +157,11 @@ static inline void silk_PLC_update(
silk_memcpy( psPLC->prevLPC_Q12, psDecCtrl->PredCoef_Q12[ 1 ], psDec->LPC_order * sizeof( opus_int16 ) );
psPLC->prevLTP_scale_Q14 = psDecCtrl->LTP_scale_Q14;
/* Save Gains */
silk_memcpy( psPLC->prevGain_Q16, psDecCtrl->Gains_Q16, psDec->nb_subfr * sizeof( opus_int32 ) );
/* Save last two gains */
silk_memcpy( psPLC->prevGain_Q16, &psDecCtrl->Gains_Q16[ psDec->nb_subfr - 2 ], 2 * sizeof( opus_int32 ) );
psPLC->subfr_length = psDec->subfr_length;
psPLC->nb_subfr = psDec->nb_subfr;
}
static inline void silk_PLC_conceal(
@ -182,23 +187,23 @@ static inline void silk_PLC_conceal(
/* Find random noise component */
/* Scale previous excitation signal */
exc_buf_ptr = exc_buf;
for( k = psDec->nb_subfr - 2; k < psDec->nb_subfr; k++ ) {
for( i = 0; i < psDec->subfr_length; i++ ) {
for( k = 0; k < 2; k++ ) {
for( i = 0; i < psPLC->subfr_length; i++ ) {
exc_buf_ptr[ i ] = ( opus_int16 )silk_RSHIFT(
silk_SMULWW( psDec->exc_Q10[ i + k * psDec->subfr_length ], psPLC->prevGain_Q16[ k ] ), 10 );
silk_SMULWW( psDec->exc_Q10[ i + ( k + psPLC->nb_subfr - 2 ) * psPLC->subfr_length ], psPLC->prevGain_Q16[ k ] ), 10 );
}
exc_buf_ptr += psDec->subfr_length;
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, psDec->subfr_length );
silk_sum_sqr_shift( &energy2, &shift2, &exc_buf[ psDec->subfr_length ], psDec->subfr_length );
silk_sum_sqr_shift( &energy1, &shift1, exc_buf, psPLC->subfr_length );
silk_sum_sqr_shift( &energy2, &shift2, &exc_buf[ psDec->subfr_length ], psPLC->subfr_length );
if( silk_RSHIFT( energy1, shift2 ) < silk_RSHIFT( energy2, shift1 ) ) {
/* First sub-frame has lowest energy */
rand_ptr = &psDec->exc_Q10[ silk_max_int( 0, psDec->frame_length - psDec->subfr_length - RAND_BUF_SIZE ) ];
rand_ptr = &psDec->exc_Q10[ silk_max_int( 0, ( psPLC->nb_subfr - 1 ) * psPLC->subfr_length - RAND_BUF_SIZE ) ];
} else {
/* Second sub-frame has lowest energy */
rand_ptr = &psDec->exc_Q10[ silk_max_int( 0, psDec->frame_length - RAND_BUF_SIZE ) ];
rand_ptr = &psDec->exc_Q10[ silk_max_int( 0, psPLC->nb_subfr * psPLC->subfr_length - RAND_BUF_SIZE ) ];
}
/* Setup Gain to random noise component */
@ -253,7 +258,7 @@ static inline void silk_PLC_conceal(
silk_assert( idx > 0 );
silk_LPC_analysis_filter( &sLTP[ idx ], &psDec->outBuf[ idx ], A_Q12, psDec->ltp_mem_length - idx, psDec->LPC_order );
/* Scale LTP state */
inv_gain_Q16 = silk_INVERSE32_varQ( psPLC->prevGain_Q16[ psDec->nb_subfr - 1 ], 32 );
inv_gain_Q16 = silk_INVERSE32_varQ( psPLC->prevGain_Q16[ 1 ], 32 );
inv_gain_Q16 = silk_min( inv_gain_Q16, silk_int16_MAX );
inv_gain_Q30 = silk_LSHIFT( inv_gain_Q16, 14 );
for( i = idx + psDec->LPC_order; i < psDec->ltp_mem_length; i++ ) {
@ -326,7 +331,7 @@ static inline void silk_PLC_conceal(
sLPC_Q14_ptr[ MAX_LPC_ORDER + i ] = silk_ADD_LSHIFT32( sLPC_Q14_ptr[ MAX_LPC_ORDER + i ], LPC_pred_Q10, 4 );
/* Scale with Gain */
frame[ i ] = ( opus_int16 )silk_SAT16( silk_RSHIFT_ROUND( silk_SMULWW( sLPC_Q14_ptr[ MAX_LPC_ORDER + i ], psPLC->prevGain_Q16[ psDec->nb_subfr - 1 ] ), 14 ) );
frame[ i ] = ( opus_int16 )silk_SAT16( silk_RSHIFT_ROUND( silk_SMULWW( sLPC_Q14_ptr[ MAX_LPC_ORDER + i ], psPLC->prevGain_Q16[ 1 ] ), 14 ) );
}
/* Save LPC state */

0
silk/create_init_destroy.c → silk/init_decoder.c
View file

2
silk/silk_common.vcxproj
View file

@ -97,7 +97,6 @@
<ClCompile Include="control_audio_bandwidth.c" />
<ClCompile Include="control_codec.c" />
<ClCompile Include="control_SNR.c" />
<ClCompile Include="create_init_destroy.c" />
<ClCompile Include="debug.c" />
<ClCompile Include="decoder_set_fs.c" />
<ClCompile Include="decode_core.c" />
@ -112,6 +111,7 @@
<ClCompile Include="enc_API.c" />
<ClCompile Include="gain_quant.c" />
<ClCompile Include="HP_variable_cutoff.c" />
<ClCompile Include="init_decoder.c" />
<ClCompile Include="init_encoder.c" />
<ClCompile Include="inner_prod_aligned.c" />
<ClCompile Include="interpolate.c" />

6
silk/silk_common.vcxproj.filters
View file

@ -51,9 +51,6 @@
<ClCompile Include="control_SNR.c">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="create_init_destroy.c">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="debug.c">
<Filter>Source Files</Filter>
</ClCompile>
@ -246,6 +243,9 @@
<ClCompile Include="VQ_WMat_EC.c">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="init_decoder.c">
<Filter>Source Files</Filter>
</ClCompile>
</ItemGroup>
<ItemGroup>
<ClInclude Include="..\win32\config.h">

4
silk/structs.h
View file

@ -237,8 +237,10 @@ typedef struct {
opus_int32 conc_energy;
opus_int conc_energy_shift;
opus_int16 prevLTP_scale_Q14;
opus_int32 prevGain_Q16[ MAX_NB_SUBFR ];
opus_int32 prevGain_Q16[ 2 ];
opus_int fs_kHz;
opus_int nb_subfr;
opus_int subfr_length;
} silk_PLC_struct;
/* Struct for CNG */