ref: e699c1989c88fcff8c4bcf0f073966094be2d2cc
dir: /silk/dec_API.c/
/***********************************************************************
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are permitted provided that the following conditions are met:
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- Redistributions in binary form must reproduce the above copyright
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BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
***********************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "API.h"
#include "main.h"
/************************/
/* Decoder Super Struct */
/************************/
typedef struct {
silk_decoder_state channel_state[ DECODER_NUM_CHANNELS ];
stereo_dec_state sStereo;
opus_int nChannelsAPI;
opus_int nChannelsInternal;
opus_int prev_decode_only_middle;
} silk_decoder;
/*********************/
/* Decoder functions */
/*********************/
opus_int silk_Get_Decoder_Size( /* O Returns error code */
opus_int *decSizeBytes /* O Number of bytes in SILK decoder state */
)
{
opus_int ret = SILK_NO_ERROR;
*decSizeBytes = sizeof( silk_decoder );
return ret;
}
/* Reset decoder state */
opus_int silk_InitDecoder( /* O Returns error code */
void *decState /* I/O State */
)
{
opus_int n, ret = SILK_NO_ERROR;
silk_decoder_state *channel_state = ((silk_decoder *)decState)->channel_state;
for( n = 0; n < DECODER_NUM_CHANNELS; n++ ) {
ret = silk_init_decoder( &channel_state[ n ] );
}
return ret;
}
/* Decode a frame */
opus_int silk_Decode( /* O Returns error code */
void* decState, /* I/O State */
silk_DecControlStruct* decControl, /* I/O Control Structure */
opus_int lostFlag, /* I 0: no loss, 1 loss, 2 decode fec */
opus_int newPacketFlag, /* I Indicates first decoder call for this packet */
ec_dec *psRangeDec, /* I/O Compressor data structure */
opus_int16 *samplesOut, /* O Decoded output speech vector */
opus_int32 *nSamplesOut /* O Number of samples decoded */
)
{
opus_int i, n, delay, decode_only_middle = 0, ret = SILK_NO_ERROR;
opus_int32 nSamplesOutDec, LBRR_symbol;
opus_int16 samplesOut1_tmp[ 2 ][ MAX_FS_KHZ * MAX_FRAME_LENGTH_MS + 2 + MAX_DECODER_DELAY ];
opus_int16 samplesOut2_tmp[ MAX_API_FS_KHZ * MAX_FRAME_LENGTH_MS ];
opus_int32 MS_pred_Q13[ 2 ] = { 0 };
opus_int16 *resample_out_ptr;
silk_decoder *psDec = ( silk_decoder * )decState;
silk_decoder_state *channel_state = psDec->channel_state;
opus_int has_side;
/**********************************/
/* Test if first frame in payload */
/**********************************/
if( newPacketFlag ) {
for( n = 0; n < decControl->nChannelsInternal; n++ ) {
channel_state[ n ].nFramesDecoded = 0; /* Used to count frames in packet */
}
}
/* If Mono -> Stereo transition in bitstream: init state of second channel */
if( decControl->nChannelsInternal > psDec->nChannelsInternal ) {
ret += silk_init_decoder( &channel_state[ 1 ] );
}
if( channel_state[ 0 ].nFramesDecoded == 0 ) {
for( n = 0; n < decControl->nChannelsInternal; n++ ) {
opus_int fs_kHz_dec;
if( decControl->payloadSize_ms == 0 ) {
/* Assuming packet loss, use 10 ms */
channel_state[ n ].nFramesPerPacket = 1;
channel_state[ n ].nb_subfr = 2;
} else if( decControl->payloadSize_ms == 10 ) {
channel_state[ n ].nFramesPerPacket = 1;
channel_state[ n ].nb_subfr = 2;
} else if( decControl->payloadSize_ms == 20 ) {
channel_state[ n ].nFramesPerPacket = 1;
channel_state[ n ].nb_subfr = 4;
} else if( decControl->payloadSize_ms == 40 ) {
channel_state[ n ].nFramesPerPacket = 2;
channel_state[ n ].nb_subfr = 4;
} else if( decControl->payloadSize_ms == 60 ) {
channel_state[ n ].nFramesPerPacket = 3;
channel_state[ n ].nb_subfr = 4;
} else {
silk_assert( 0 );
return SILK_DEC_INVALID_FRAME_SIZE;
}
fs_kHz_dec = ( decControl->internalSampleRate >> 10 ) + 1;
if( fs_kHz_dec != 8 && fs_kHz_dec != 12 && fs_kHz_dec != 16 ) {
silk_assert( 0 );
return SILK_DEC_INVALID_SAMPLING_FREQUENCY;
}
ret += silk_decoder_set_fs( &channel_state[ n ], fs_kHz_dec, decControl->API_sampleRate );
}
}
delay = channel_state[ 0 ].delay;
if( decControl->nChannelsAPI == 2 && decControl->nChannelsInternal == 2 && ( psDec->nChannelsAPI == 1 || psDec->nChannelsInternal == 1 ) ) {
silk_memset( psDec->sStereo.pred_prev_Q13, 0, sizeof( psDec->sStereo.pred_prev_Q13 ) );
silk_memset( psDec->sStereo.sSide, 0, sizeof( psDec->sStereo.sSide ) );
silk_memcpy( &channel_state[ 1 ].resampler_state, &channel_state[ 0 ].resampler_state, sizeof( silk_resampler_state_struct ) );
silk_memcpy( &channel_state[ 1 ].delayBuf, &channel_state[ 0 ].delayBuf, sizeof(channel_state[ 0 ].delayBuf));
}
psDec->nChannelsAPI = decControl->nChannelsAPI;
psDec->nChannelsInternal = decControl->nChannelsInternal;
if( decControl->API_sampleRate > MAX_API_FS_KHZ * 1000 || decControl->API_sampleRate < 8000 ) {
ret = SILK_DEC_INVALID_SAMPLING_FREQUENCY;
return( ret );
}
if( lostFlag != FLAG_PACKET_LOST && channel_state[ 0 ].nFramesDecoded == 0 ) {
/* First decoder call for this payload */
/* Decode VAD flags and LBRR flag */
for( n = 0; n < decControl->nChannelsInternal; n++ ) {
for( i = 0; i < channel_state[ n ].nFramesPerPacket; i++ ) {
channel_state[ n ].VAD_flags[ i ] = ec_dec_bit_logp(psRangeDec, 1);
}
channel_state[ n ].LBRR_flag = ec_dec_bit_logp(psRangeDec, 1);
}
/* Decode LBRR flags */
for( n = 0; n < decControl->nChannelsInternal; n++ ) {
silk_memset( channel_state[ n ].LBRR_flags, 0, sizeof( channel_state[ n ].LBRR_flags ) );
if( channel_state[ n ].LBRR_flag ) {
if( channel_state[ n ].nFramesPerPacket == 1 ) {
channel_state[ n ].LBRR_flags[ 0 ] = 1;
} else {
LBRR_symbol = ec_dec_icdf( psRangeDec, silk_LBRR_flags_iCDF_ptr[ channel_state[ n ].nFramesPerPacket - 2 ], 8 ) + 1;
for( i = 0; i < channel_state[ n ].nFramesPerPacket; i++ ) {
channel_state[ n ].LBRR_flags[ i ] = silk_RSHIFT( LBRR_symbol, i ) & 1;
}
}
}
}
if( lostFlag == FLAG_DECODE_NORMAL ) {
/* Regular decoding: skip all LBRR data */
for( i = 0; i < channel_state[ 0 ].nFramesPerPacket; i++ ) {
for( n = 0; n < decControl->nChannelsInternal; n++ ) {
if( channel_state[ n ].LBRR_flags[ i ] ) {
opus_int pulses[ MAX_FRAME_LENGTH ];
opus_int condCoding;
if( decControl->nChannelsInternal == 2 && n == 0 ) {
silk_stereo_decode_pred( psRangeDec, MS_pred_Q13 );
if( channel_state[ 1 ].LBRR_flags[ i ] == 0 ) {
silk_stereo_decode_mid_only( psRangeDec, &decode_only_middle );
}
}
/* Use conditional coding if previous frame available */
if( i > 0 && channel_state[ n ].LBRR_flags[ i - 1 ] ) {
condCoding = CODE_CONDITIONALLY;
} else {
condCoding = CODE_INDEPENDENTLY;
}
silk_decode_indices( &channel_state[ n ], psRangeDec, i, 1, condCoding );
silk_decode_pulses( psRangeDec, pulses, channel_state[ n ].indices.signalType,
channel_state[ n ].indices.quantOffsetType, channel_state[ n ].frame_length );
}
}
}
}
}
/* Get MS predictor index */
if( decControl->nChannelsInternal == 2 ) {
if( lostFlag == FLAG_DECODE_NORMAL ||
( lostFlag == FLAG_DECODE_LBRR && channel_state[ 0 ].LBRR_flags[ channel_state[ 0 ].nFramesDecoded ] == 1 ) )
{
silk_stereo_decode_pred( psRangeDec, MS_pred_Q13 );
/* For LBRR data, decode mid-only flag only if side-channel's LBRR flag is false */
if( ( lostFlag == FLAG_DECODE_NORMAL && channel_state[ 1 ].VAD_flags[ channel_state[ 0 ].nFramesDecoded ] == 0 ) ||
( lostFlag == FLAG_DECODE_LBRR && channel_state[ 1 ].LBRR_flags[ channel_state[ 0 ].nFramesDecoded ] == 0 ) )
{
silk_stereo_decode_mid_only( psRangeDec, &decode_only_middle );
} else {
decode_only_middle = 0;
}
} else {
for( n = 0; n < 2; n++ ) {
MS_pred_Q13[ n ] = psDec->sStereo.pred_prev_Q13[ n ];
}
}
}
/* Reset side channel decoder prediction memory for first frame with side coding */
if( decControl->nChannelsInternal == 2 && decode_only_middle == 0 && psDec->prev_decode_only_middle == 1 ) {
silk_memset( psDec->channel_state[ 1 ].outBuf, 0, sizeof(psDec->channel_state[ 1 ].outBuf) );
silk_memset( psDec->channel_state[ 1 ].sLPC_Q14_buf, 0, sizeof(psDec->channel_state[ 1 ].sLPC_Q14_buf) );
psDec->channel_state[ 1 ].lagPrev = 100;
psDec->channel_state[ 1 ].LastGainIndex = 10;
psDec->channel_state[ 1 ].prevSignalType = TYPE_NO_VOICE_ACTIVITY;
psDec->channel_state[ 1 ].first_frame_after_reset = 1;
}
if( lostFlag == FLAG_DECODE_NORMAL ) {
has_side = !decode_only_middle;
} else {
has_side = !psDec->prev_decode_only_middle
|| (decControl->nChannelsInternal == 2 && lostFlag == FLAG_DECODE_LBRR && channel_state[1].LBRR_flags[ channel_state[1].nFramesDecoded ] == 1 );
}
/* Call decoder for one frame */
for( n = 0; n < decControl->nChannelsInternal; n++ ) {
if( n == 0 || has_side ) {
opus_int FrameIndex;
opus_int condCoding;
FrameIndex = channel_state[ 0 ].nFramesDecoded - n;
/* Use independent coding if no previous frame available */
if( FrameIndex <= 0 ) {
condCoding = CODE_INDEPENDENTLY;
} else if( lostFlag == FLAG_DECODE_LBRR ) {
condCoding = channel_state[ n ].LBRR_flags[ FrameIndex - 1 ] ? CODE_CONDITIONALLY : CODE_INDEPENDENTLY;
} else if( n > 0 && psDec->prev_decode_only_middle ) {
/* If we skipped a side frame in this packet, we don't
need LTP scaling; the LTP state is well-defined. */
condCoding = CODE_INDEPENDENTLY_NO_LTP_SCALING;
} else {
condCoding = CODE_CONDITIONALLY;
}
ret += silk_decode_frame( &channel_state[ n ], psRangeDec, &samplesOut1_tmp[ n ][ 2 + delay ], &nSamplesOutDec, lostFlag, condCoding);
} else {
silk_memset( &samplesOut1_tmp[ n ][ 2 + delay ], 0, nSamplesOutDec * sizeof( opus_int16 ) );
}
channel_state[ n ].nFramesDecoded++;
}
if( decControl->nChannelsAPI == 2 && decControl->nChannelsInternal == 2 ) {
/* Convert Mid/Side to Left/Right */
silk_stereo_MS_to_LR( &psDec->sStereo, &samplesOut1_tmp[ 0 ][ delay ], &samplesOut1_tmp[ 1 ][ delay ], MS_pred_Q13, channel_state[ 0 ].fs_kHz, nSamplesOutDec );
} else {
/* Buffering */
silk_memcpy( &samplesOut1_tmp[ 0 ][ delay ], psDec->sStereo.sMid, 2 * sizeof( opus_int16 ) );
silk_memcpy( psDec->sStereo.sMid, &samplesOut1_tmp[ 0 ][ nSamplesOutDec + delay ], 2 * sizeof( opus_int16 ) );
}
/* Number of output samples */
*nSamplesOut = silk_DIV32( nSamplesOutDec * decControl->API_sampleRate, silk_SMULBB( channel_state[ 0 ].fs_kHz, 1000 ) );
/* Set up pointers to temp buffers */
if( decControl->nChannelsAPI == 2 ) {
resample_out_ptr = samplesOut2_tmp;
} else {
resample_out_ptr = samplesOut;
}
for( n = 0; n < silk_min( decControl->nChannelsAPI, decControl->nChannelsInternal ); n++ ) {
silk_memcpy(&samplesOut1_tmp[ n ][ 1 ], &channel_state[ n ].delayBuf[ MAX_DECODER_DELAY - delay ], delay * sizeof(opus_int16));
/* Resample decoded signal to API_sampleRate */
ret += silk_resampler( &channel_state[ n ].resampler_state, resample_out_ptr, &samplesOut1_tmp[ n ][ 1 ], nSamplesOutDec );
silk_memcpy(channel_state[ n ].delayBuf, &samplesOut1_tmp[ n ][ 1 + nSamplesOutDec + delay - MAX_DECODER_DELAY ], MAX_DECODER_DELAY * sizeof(opus_int16));
/* Interleave if stereo output and stereo stream */
if( decControl->nChannelsAPI == 2 && decControl->nChannelsInternal == 2 ) {
for( i = 0; i < *nSamplesOut; i++ ) {
samplesOut[ n + 2 * i ] = resample_out_ptr[ i ];
}
}
}
/* Create two channel output from mono stream */
if( decControl->nChannelsAPI == 2 && decControl->nChannelsInternal == 1 ) {
for( i = 0; i < *nSamplesOut; i++ ) {
samplesOut[ 0 + 2 * i ] = samplesOut[ 1 + 2 * i ] = resample_out_ptr[ i ];
}
}
/* Export pitch lag, measured at 48 kHz sampling rate */
if( channel_state[ 0 ].prevSignalType == TYPE_VOICED ) {
int mult_tab[ 3 ] = { 6, 4, 3 };
decControl->prevPitchLag = channel_state[ 0 ].lagPrev * mult_tab[ ( channel_state[ 0 ].fs_kHz - 8 ) >> 2 ];
} else {
decControl->prevPitchLag = 0;
}
if( lostFlag != FLAG_PACKET_LOST ) {
psDec->prev_decode_only_middle = decode_only_middle;
}
return ret;
}
/* Getting table of contents for a packet */
opus_int silk_get_TOC(
const opus_uint8 *payload, /* I Payload data */
const opus_int nBytesIn, /* I Number of input bytes */
const opus_int nFramesPerPayload, /* I Number of SILK frames per payload */
silk_TOC_struct *Silk_TOC /* O Type of content */
)
{
opus_int i, flags, ret = SILK_NO_ERROR;
if( nBytesIn < 1 ) {
return -1;
}
if( nFramesPerPayload < 0 || nFramesPerPayload > 3 ) {
return -1;
}
silk_memset( Silk_TOC, 0, sizeof( Silk_TOC ) );
/* For stereo, extract the flags for the mid channel */
flags = silk_RSHIFT( payload[ 0 ], 7 - nFramesPerPayload ) & ( silk_LSHIFT( 1, nFramesPerPayload + 1 ) - 1 );
Silk_TOC->inbandFECFlag = flags & 1;
for( i = nFramesPerPayload - 1; i >= 0 ; i-- ) {
flags = silk_RSHIFT( flags, 1 );
Silk_TOC->VADFlags[ i ] = flags & 1;
Silk_TOC->VADFlag |= flags & 1;
}
return ret;
}