ref: bf8577992e69de9182d29fe37739dbd6b5ac7354
dir: /src_common/SKP_Silk_dec_API.c/
/***********************************************************************
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are permitted provided that the following conditions are met:
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BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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***********************************************************************/
#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;
}
/* Prefill LPC synthesis buffer, HP filter and upsampler. Input must be exactly 10 ms of audio. */
SKP_int SKP_Silk_SDK_Decoder_prefill_buffers( /* O: Returns error code */
void* decState, /* I/O: State */
SKP_SILK_SDK_DecControlStruct* decControl, /* I/O: Control Structure */
const SKP_int16 *samplesIn, /* I: Speech sample input vector (10 ms) */
SKP_int nSamplesIn /* I: Number of samples in input vector */
)
{
SKP_int i, nSamples, ret = 0;
SKP_Silk_decoder_state *psDec = ( SKP_Silk_decoder_state *)decState;
SKP_Silk_resampler_state_struct resampler_state;
SKP_int16 buf[ 10 * MAX_FS_KHZ ];
SKP_int16 buf_out[ 10 * MAX_API_FS_KHZ ];
const SKP_int16 *in_ptr;
/* Compute some numbers at API sampling rate */
if( nSamplesIn != SKP_DIV32_16( decControl->API_sampleRate, 100 ) ) {
return -1;
}
/* Resample input if necessary */
if( decControl->API_sampleRate != SKP_SMULBB( 1000, psDec->fs_kHz ) ) {
ret += SKP_Silk_resampler_init( &resampler_state, decControl->API_sampleRate, SKP_SMULBB( 1000, psDec->fs_kHz ) );
ret += SKP_Silk_resampler( &resampler_state, buf, samplesIn, nSamplesIn );
in_ptr = buf;
nSamples = SKP_SMULBB( 10, psDec->fs_kHz );
} else {
in_ptr = samplesIn;
nSamples = nSamplesIn;
}
/* Set synthesis filter state */
for( i = 0; i < psDec->LPC_order; i++ ) {
psDec->sLPC_Q14[ MAX_LPC_ORDER - i ] = SKP_LSHIFT( SKP_SMULWB( psDec->prev_inv_gain_Q16, in_ptr[ nSamples - i ] ), 14 );
}
/* HP filter */
SKP_Silk_biquad_alt( in_ptr, psDec->HP_B, psDec->HP_A, psDec->HPState, buf, nSamples );
/* Output upsampler */
SKP_Silk_resampler( &psDec->resampler_state, buf_out, buf, nSamples );
/* Avoid using LSF interpolation or pitch prediction in first next frame */
psDec->first_frame_after_reset = 1;
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, 2 decode fec */
SKP_int newPacketFlag, /* I: Indicates first decoder call for this packet */
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, prev_fs_kHz;
SKP_Silk_decoder_state *psDec;
psDec = (SKP_Silk_decoder_state *)decState;
/**********************************/
/* Test if first frame in payload */
/**********************************/
if( newPacketFlag ) {
/* First Frame in Payload */
psDec->nFramesDecoded = 0; /* Used to count frames in packet */
}
/* 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->nFramesPerPacket = 1;
psDec->nb_subfr = 2;
} else if( decControl->payloadSize_ms == 20 ) {
psDec->nFramesPerPacket = 1;
psDec->nb_subfr = 4;
} else if( decControl->payloadSize_ms == 40 ) {
psDec->nFramesPerPacket = 2;
psDec->nb_subfr = 4;
} else if( decControl->payloadSize_ms == 60 ) {
psDec->nFramesPerPacket = 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 );
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->nFramesPerPacket;
return ret;
}
/* Getting table of contents for a packet */
SKP_int SKP_Silk_SDK_get_TOC(
const SKP_uint8 *payload, /* I Payload data */
const SKP_int nBytesIn, /* I: Number of input bytes */
const SKP_int nFramesPerPayload, /* I: Number of SILK frames per payload */
SKP_Silk_TOC_struct *Silk_TOC /* O: Type of content */
)
{
SKP_int i, flags, ret = SKP_SILK_NO_ERROR;
if( nBytesIn < 1 ) {
return -1;
}
if( nFramesPerPayload < 0 || nFramesPerPayload > 3 ) {
return -1;
}
SKP_memset( Silk_TOC, 0, sizeof( Silk_TOC ) );
flags = SKP_RSHIFT( payload[ 0 ], 7 - nFramesPerPayload ) & ( SKP_LSHIFT( 1, nFramesPerPayload + 1 ) - 1 );
Silk_TOC->inbandFECFlag = flags & 1;
for( i = nFramesPerPayload - 1; i >= 0 ; i-- ) {
flags = SKP_RSHIFT( flags, 1 );
Silk_TOC->VADFlags[ i ] = flags & 1;
Silk_TOC->VADFlag |= flags & 1;
}
return ret;
}