ref: 111b23f648a45d3a034050e579a531d0592dc720
dir: /src_common/SKP_Silk_dec_API.c/
/***********************************************************************
Copyright (c) 2006-2010, Skype Limited. All rights reserved.
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modification, (subject to the limitations in the disclaimer below)
are permitted provided that the following conditions are met:
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this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright
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documentation and/or other materials provided with the distribution.
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this software without specific prior written permission.
NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED
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.
***********************************************************************/
#include "SKP_Silk_SDK_API.h"
#include "SKP_Silk_main.h"
/*********************/
/* Decoder functions */
/*********************/
SKP_int SKP_Silk_SDK_Get_Decoder_Size( SKP_int32 *decSizeBytes )
{
SKP_int ret = SKP_SILK_NO_ERROR;
*decSizeBytes = sizeof( SKP_Silk_decoder_state );
return ret;
}
/* Reset decoder state */
SKP_int SKP_Silk_SDK_InitDecoder(
void* decState /* I/O: State */
)
{
SKP_int ret = SKP_SILK_NO_ERROR;
SKP_Silk_decoder_state *struc;
struc = (SKP_Silk_decoder_state *)decState;
ret = SKP_Silk_init_decoder( struc );
return ret;
}
/* Decode a frame */
SKP_int SKP_Silk_SDK_Decode(
void* decState, /* I/O: State */
SKP_SILK_SDK_DecControlStruct* decControl, /* I/O: Control Structure */
SKP_int lostFlag, /* I: 0: no loss, 1 loss */
ec_dec *psRangeDec, /* I/O Compressor data structure */
const SKP_int nBytesIn, /* I: Number of input bytes */
SKP_int16 *samplesOut, /* O: Decoded output speech vector */
SKP_int32 *nSamplesOut /* O: Number of samples decoded */
)
{
SKP_int ret = SKP_SILK_NO_ERROR, used_bytes, prev_fs_kHz;
SKP_Silk_decoder_state *psDec;
psDec = (SKP_Silk_decoder_state *)decState;
/**********************************/
/* Test if first frame in payload */
/**********************************/
if( psDec->moreInternalDecoderFrames == 0 ) {
/* First Frame in Payload */
psDec->nFramesDecoded = 0; /* Used to count frames in packet */
}
if( psDec->moreInternalDecoderFrames == 0 && /* First frame in packet */
lostFlag == 0 && /* Not packet loss */
nBytesIn > MAX_ARITHM_BYTES ) { /* Too long payload */
/* Avoid trying to decode a too large packet */
lostFlag = 1;
return SKP_SILK_DEC_PAYLOAD_TOO_LARGE;
}
/* Save previous sample frequency */
prev_fs_kHz = psDec->fs_kHz;
if( psDec->nFramesDecoded == 0 ) {
SKP_int fs_kHz_dec;
if( decControl->payloadSize_ms == 10 ) {
psDec->nFramesInPacket = 1;
psDec->nb_subfr = 2;
} else if( decControl->payloadSize_ms == 20 ) {
psDec->nFramesInPacket = 1;
psDec->nb_subfr = 4;
} else if( decControl->payloadSize_ms == 40 ) {
psDec->nFramesInPacket = 2;
psDec->nb_subfr = 4;
} else if( decControl->payloadSize_ms == 60 ) {
psDec->nFramesInPacket = 3;
psDec->nb_subfr = 4;
} else {
SKP_assert( 0 );
return SKP_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 ) {
SKP_assert( 0 );
return SKP_SILK_DEC_INVALID_SAMPLING_FREQUENCY;
}
SKP_Silk_decoder_set_fs( psDec, fs_kHz_dec );
}
/* Call decoder for one frame */
ret += SKP_Silk_decode_frame( psDec, psRangeDec, samplesOut, nSamplesOut, nBytesIn, lostFlag, &used_bytes );
if( used_bytes ) { /* Only Call if not a packet loss */
psDec->moreInternalDecoderFrames = psDec->nFramesInPacket - psDec->nFramesDecoded;
if( psDec->nBytesLeft <= 0 || psDec->moreInternalDecoderFrames <= 0 ) {
/* Last frame in Payload */
/* Track inband FEC usage */
if( psDec->vadFlag == VOICE_ACTIVITY ) {
if( psDec->FrameTermination == SKP_SILK_NO_LBRR ) {
psDec->no_FEC_counter++;
if( psDec->no_FEC_counter > NO_LBRR_THRES ) {
psDec->inband_FEC_offset = 0;
}
} else if( psDec->FrameTermination == SKP_SILK_LBRR ) {
psDec->inband_FEC_offset = 1; /* FEC info with 1 packet delay */
psDec->no_FEC_counter = 0;
}
}
}
}
if( decControl->API_sampleRate > MAX_API_FS_KHZ * 1000 || decControl->API_sampleRate < 8000 ) {
ret = SKP_SILK_DEC_INVALID_SAMPLING_FREQUENCY;
return( ret );
}
/* Resample if needed */
if( SKP_SMULBB( psDec->fs_kHz, 1000 ) != decControl->API_sampleRate ) {
SKP_int16 samplesOut_tmp[ MAX_API_FS_KHZ * MAX_FRAME_LENGTH_MS ];
SKP_assert( psDec->fs_kHz <= MAX_API_FS_KHZ );
/* Copy to a tmp buffer as the resampling writes to samplesOut */
SKP_memcpy( samplesOut_tmp, samplesOut, *nSamplesOut * sizeof( SKP_int16 ) );
/* (Re-)initialize resampler state when switching internal sampling frequency */
if( prev_fs_kHz != psDec->fs_kHz || psDec->prev_API_sampleRate != decControl->API_sampleRate ) {
ret = SKP_Silk_resampler_init( &psDec->resampler_state, SKP_SMULBB( psDec->fs_kHz, 1000 ), decControl->API_sampleRate );
}
/* Resample the output to API_sampleRate */
ret += SKP_Silk_resampler( &psDec->resampler_state, samplesOut, samplesOut_tmp, *nSamplesOut );
/* Update the number of output samples */
*nSamplesOut = SKP_DIV32( ( SKP_int32 )*nSamplesOut * decControl->API_sampleRate, SKP_SMULBB( psDec->fs_kHz, 1000 ) );
}
psDec->prev_API_sampleRate = decControl->API_sampleRate;
/* Copy all parameters that are needed out of internal structure to the control stucture */
decControl->frameSize = ( SKP_int )*nSamplesOut;
decControl->framesPerPayload = ( SKP_int )psDec->nFramesInPacket;
decControl->inBandFECOffset = ( SKP_int )psDec->inband_FEC_offset;
decControl->moreInternalDecoderFrames = ( SKP_int )psDec->moreInternalDecoderFrames;
return ret;
}
#if 0
/* Function to find LBRR information in a packet */
void SKP_Silk_SDK_search_for_LBRR(
const SKP_uint8 *inData, /* I: Encoded input vector */
const SKP_int16 nBytesIn, /* I: Number of input Bytes */
SKP_int lost_offset, /* I: Offset from lost packet */
SKP_uint8 *LBRRData, /* O: LBRR payload */
SKP_int16 *nLBRRBytes /* O: Number of LBRR Bytes */
)
{
SKP_int ret = SKP_SILK_NO_ERROR;
SKP_Silk_decoder_state sDec; // Local decoder state to avoid interfering with running decoder */
SKP_Silk_decoder_control sDecCtrl;
SKP_int i, TempQ[ MAX_FRAME_LENGTH ];
if( lost_offset < 1 || lost_offset > MAX_LBRR_DELAY ) {
/* No useful FEC in this packet */
*nLBRRBytes = 0;
return;
}
sDec.nFramesDecoded = 0;
sDec.fs_kHz = 0; /* Force update parameters LPC_order etc */
SKP_memset( sDec.prevNLSF_Q15, 0, MAX_LPC_ORDER * sizeof( SKP_int ) );
/* Decode all parameter indices for the whole packet*/
SKP_Silk_decode_indices( &sDec, psRangeDec );
/* Is there usable LBRR in this packet */
*nLBRRBytes = 0;
if( ( sDec.FrameTermination - 1 ) & lost_offset && sDec.FrameTermination > 0 && sDec.nBytesLeft >= 0 ) {
/* The wanted FEC is present in the packet */
for( i = 0; i < sDec.nFramesInPacket; i++ ) {
SKP_Silk_decode_parameters( &sDec, &sDecCtrl, psRangeDec, TempQ, 0 );
if( sDec.nBytesLeft <= 0 || sDec.sRC.error ) {
/* Corrupt stream */
LBRRData = NULL;
*nLBRRBytes = 0;
break;
} else {
sDec.nFramesDecoded++;
}
}
if( LBRRData != NULL ) {
/* The wanted FEC is present in the packet */
*nLBRRBytes = sDec.nBytesLeft;
SKP_memcpy( LBRRData, &inData[ nBytesIn - sDec.nBytesLeft ], sDec.nBytesLeft * sizeof( SKP_uint8 ) );
}
}
}
#endif
/* Getting type of content for a packet */
void SKP_Silk_SDK_get_TOC(
ec_dec *psRangeDec, /* I/O Compressor data structure */
const SKP_int16 nBytesIn, /* I: Number of input bytes */
SKP_Silk_TOC_struct *Silk_TOC /* O: Type of content */
)
{
SKP_Silk_decoder_state sDec; // Local Decoder state to avoid interfering with running decoder */
SKP_int i, ret = SKP_SILK_NO_ERROR;
sDec.nFramesDecoded = 0;
sDec.fs_kHz = 0; /* Force update parameters LPC_order etc */
/* Decode all parameter indices for the whole packet*/
SKP_Silk_decode_indices( &sDec, psRangeDec );
if( psRangeDec->error ) {
/* Corrupt packet */
SKP_memset( Silk_TOC, 0, sizeof( SKP_Silk_TOC_struct ) );
Silk_TOC->corrupt = 1;
} else {
Silk_TOC->corrupt = 0;
Silk_TOC->framesInPacket = sDec.nFramesInPacket;
Silk_TOC->fs_kHz = sDec.fs_kHz;
if( sDec.FrameTermination == SKP_SILK_LBRR ) {
Silk_TOC->inbandLBRR = 1;
} else {
Silk_TOC->inbandLBRR = 0;
}
/* Copy data */
for( i = 0; i < sDec.nFramesInPacket; i++ ) {
Silk_TOC->signalTypeFlags[ i ] = sDec.signalType[ i ];
}
}
}