ref: fe741259c1050baa5c828444dd5a968ed658d1fb
dir: /silk/SKP_Silk_enc_API.c/
/***********************************************************************
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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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this software without specific prior written permission.
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BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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***********************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "SKP_Silk_define.h"
#include "SKP_Silk_SDK_API.h"
#include "SKP_Silk_control.h"
#include "SKP_Silk_typedef.h"
#include "SKP_Silk_structs.h"
#include "SKP_Silk_tuning_parameters.h"
#if FIXED_POINT
#include "SKP_Silk_main_FIX.h"
#define SKP_Silk_encoder_state_Fxx SKP_Silk_encoder_state_FIX
#define SKP_Silk_encode_frame_Fxx SKP_Silk_encode_frame_FIX
#else
#include "SKP_Silk_main_FLP.h"
#define SKP_Silk_encoder_state_Fxx SKP_Silk_encoder_state_FLP
#define SKP_Silk_encode_frame_Fxx SKP_Silk_encode_frame_FLP
#endif
/* Encoder Super Struct */
typedef struct {
SKP_Silk_encoder_state_Fxx state_Fxx[ ENCODER_NUM_CHANNELS ];
stereo_state sStereo;
SKP_int32 nBitsExceeded;
SKP_int nChannels;
SKP_int timeSinceSwitchAllowed_ms;
SKP_int allowBandwidthSwitch;
} SKP_Silk_encoder;
/****************************************/
/* Encoder functions */
/****************************************/
SKP_int SKP_Silk_SDK_Get_Encoder_Size( SKP_int32 *encSizeBytes )
{
SKP_int ret = SKP_SILK_NO_ERROR;
*encSizeBytes = sizeof( SKP_Silk_encoder );
return ret;
}
/*************************/
/* Init or Reset encoder */
/*************************/
SKP_int SKP_Silk_SDK_InitEncoder(
void *encState, /* I/O: State */
SKP_SILK_SDK_EncControlStruct *encStatus /* O: Control structure */
)
{
SKP_Silk_encoder *psEnc;
SKP_int n, ret = SKP_SILK_NO_ERROR;
psEnc = (SKP_Silk_encoder *)encState;
/* Reset encoder */
for( n = 0; n < ENCODER_NUM_CHANNELS; n++ ) {
if( ret += SKP_Silk_init_encoder( &psEnc->state_Fxx[ n ] ) ) {
SKP_assert( 0 );
}
}
SKP_memset( &psEnc->sStereo, 0, sizeof( psEnc->sStereo ) );
psEnc->nBitsExceeded = 0;
psEnc->nChannels = 1;
/* Read control structure */
if( ret += SKP_Silk_SDK_QueryEncoder( encState, encStatus ) ) {
SKP_assert( 0 );
}
return ret;
}
/***************************************/
/* Read control structure from encoder */
/***************************************/
SKP_int SKP_Silk_SDK_QueryEncoder(
const void *encState, /* I: State Vector */
SKP_SILK_SDK_EncControlStruct *encStatus /* O: Control Structure */
)
{
SKP_Silk_encoder_state_Fxx *state_Fxx;
SKP_int ret = SKP_SILK_NO_ERROR;
state_Fxx = ((SKP_Silk_encoder *)encState)->state_Fxx;
encStatus->API_sampleRate = state_Fxx->sCmn.API_fs_Hz;
encStatus->maxInternalSampleRate = state_Fxx->sCmn.maxInternal_fs_Hz;
encStatus->minInternalSampleRate = state_Fxx->sCmn.minInternal_fs_Hz;
encStatus->desiredInternalSampleRate = state_Fxx->sCmn.desiredInternal_fs_Hz;
encStatus->payloadSize_ms = state_Fxx->sCmn.PacketSize_ms;
encStatus->bitRate = state_Fxx->sCmn.TargetRate_bps;
encStatus->packetLossPercentage = state_Fxx->sCmn.PacketLoss_perc;
encStatus->complexity = state_Fxx->sCmn.Complexity;
encStatus->useInBandFEC = state_Fxx->sCmn.useInBandFEC;
encStatus->useDTX = state_Fxx->sCmn.useDTX;
encStatus->useCBR = state_Fxx->sCmn.useCBR;
encStatus->internalSampleRate = SKP_SMULBB( state_Fxx->sCmn.fs_kHz, 1000 );
return ret;
}
/**************************/
/* Encode frame with Silk */
/**************************/
SKP_int SKP_Silk_SDK_Encode(
void *encState, /* I/O: State */
SKP_SILK_SDK_EncControlStruct *encControl, /* I: Control structure */
const SKP_int16 *samplesIn, /* I: Speech sample input vector */
SKP_int nSamplesIn, /* I: Number of samples in input vector */
ec_enc *psRangeEnc, /* I/O Compressor data structure */
SKP_int32 *nBytesOut, /* I/O: Number of bytes in payload (input: Max bytes) */
const SKP_int prefillFlag /* I: Flag to indicate prefilling buffers; no coding */
)
{
SKP_int n, i, nBits, flags, tmp_payloadSize_ms, tmp_complexity, MS_predictorIx = 0, ret = 0;
SKP_int nSamplesToBuffer, nBlocksOf10ms, nSamplesFromInput = 0;
SKP_int speech_act_thr_for_switch_Q8;
SKP_int32 TargetRate_bps, channelRate_bps, LBRR_symbol;
SKP_Silk_encoder *psEnc = ( SKP_Silk_encoder * )encState;
SKP_int16 buf[ MAX_FRAME_LENGTH_MS * MAX_API_FS_KHZ ];
/* Check values in encoder control structure */
if( ( ret = check_control_input( encControl ) != 0 ) ) {
SKP_assert( 0 );
return ret;
}
if( encControl->nChannels > psEnc->nChannels ) {
/* Mono -> Stereo transition: init state of second channel and stereo state */
SKP_memset( &psEnc->sStereo, 0, sizeof( psEnc->sStereo ) );
ret += SKP_Silk_init_encoder( &psEnc->state_Fxx[ 1 ] );
}
psEnc->nChannels = encControl->nChannels;
nBlocksOf10ms = SKP_DIV32( 100 * nSamplesIn, encControl->API_sampleRate );
if( prefillFlag ) {
/* Only accept input length of 10 ms */
if( nBlocksOf10ms != 1 ) {
ret = SKP_SILK_ENC_INPUT_INVALID_NO_OF_SAMPLES;
SKP_assert( 0 );
return ret;
}
/* Reset Encoder */
for( n = 0; n < encControl->nChannels; n++ ) {
if( ret = SKP_Silk_init_encoder( &psEnc->state_Fxx[ n ] ) ) {
SKP_assert( 0 );
}
}
tmp_payloadSize_ms = encControl->payloadSize_ms;
encControl->payloadSize_ms = 10;
tmp_complexity = encControl->complexity;
encControl->complexity = 0;
for( n = 0; n < encControl->nChannels; n++ ) {
psEnc->state_Fxx[ n ].sCmn.controlled_since_last_payload = 0;
psEnc->state_Fxx[ n ].sCmn.prefillFlag = 1;
}
} else {
/* Only accept input lengths that are a multiple of 10 ms */
if( nBlocksOf10ms * encControl->API_sampleRate != 100 * nSamplesIn || nSamplesIn < 0 ) {
ret = SKP_SILK_ENC_INPUT_INVALID_NO_OF_SAMPLES;
SKP_assert( 0 );
return ret;
}
/* Make sure no more than one packet can be produced */
if( 1000 * (SKP_int32)nSamplesIn > encControl->payloadSize_ms * encControl->API_sampleRate ) {
ret = SKP_SILK_ENC_INPUT_INVALID_NO_OF_SAMPLES;
SKP_assert( 0 );
return ret;
}
}
TargetRate_bps = SKP_RSHIFT32( encControl->bitRate, encControl->nChannels - 1 );
for( n = 0; n < encControl->nChannels; n++ ) {
if( ( ret = SKP_Silk_control_encoder( &psEnc->state_Fxx[ n ], encControl, TargetRate_bps, psEnc->allowBandwidthSwitch ) ) != 0 ) {
SKP_assert( 0 );
return ret;
}
}
SKP_assert( encControl->nChannels == 1 || psEnc->state_Fxx[ 0 ].sCmn.fs_kHz == psEnc->state_Fxx[ 1 ].sCmn.fs_kHz );
/* Input buffering/resampling and encoding */
while( 1 ) {
nSamplesToBuffer = psEnc->state_Fxx[ 0 ].sCmn.frame_length - psEnc->state_Fxx[ 0 ].sCmn.inputBufIx;
nSamplesToBuffer = SKP_min( nSamplesToBuffer, 10 * nBlocksOf10ms * psEnc->state_Fxx[ 0 ].sCmn.fs_kHz );
nSamplesFromInput = SKP_DIV32_16( nSamplesToBuffer * psEnc->state_Fxx[ 0 ].sCmn.API_fs_Hz, psEnc->state_Fxx[ 0 ].sCmn.fs_kHz * 1000 );
/* Resample and write to buffer */
if( encControl->nChannels == 2 ) {
for( n = 0; n < nSamplesFromInput; n++ ) {
buf[ n ] = samplesIn[ 2 * n ];
}
ret += SKP_Silk_resampler( &psEnc->state_Fxx[ 0 ].sCmn.resampler_state,
&psEnc->state_Fxx[ 0 ].sCmn.inputBuf[ psEnc->state_Fxx[ 0 ].sCmn.inputBufIx ], buf, nSamplesFromInput );
psEnc->state_Fxx[ 0 ].sCmn.inputBufIx += nSamplesToBuffer;
nSamplesToBuffer = psEnc->state_Fxx[ 1 ].sCmn.frame_length - psEnc->state_Fxx[ 1 ].sCmn.inputBufIx;
nSamplesToBuffer = SKP_min( nSamplesToBuffer, 10 * nBlocksOf10ms * psEnc->state_Fxx[ 1 ].sCmn.fs_kHz );
for( n = 0; n < nSamplesFromInput; n++ ) {
buf[ n ] = samplesIn[ 2 * n + 1 ];
}
ret += SKP_Silk_resampler( &psEnc->state_Fxx[ 1 ].sCmn.resampler_state,
&psEnc->state_Fxx[ 1 ].sCmn.inputBuf[ psEnc->state_Fxx[ 1 ].sCmn.inputBufIx ], buf, nSamplesFromInput );
psEnc->state_Fxx[ 1 ].sCmn.inputBufIx += nSamplesToBuffer;
} else {
SKP_assert( encControl->nChannels == 1 );
ret += SKP_Silk_resampler( &psEnc->state_Fxx[ 0 ].sCmn.resampler_state,
&psEnc->state_Fxx[ 0 ].sCmn.inputBuf[ psEnc->state_Fxx[ 0 ].sCmn.inputBufIx ], samplesIn, nSamplesFromInput );
psEnc->state_Fxx[ 0 ].sCmn.inputBufIx += nSamplesToBuffer;
}
samplesIn += nSamplesFromInput * encControl->nChannels;
nSamplesIn -= nSamplesFromInput;
/* Default */
psEnc->allowBandwidthSwitch = 0;
/* Silk encoder */
if( psEnc->state_Fxx[ 0 ].sCmn.inputBufIx >= psEnc->state_Fxx[ 0 ].sCmn.frame_length ) {
/* Enough data in input buffer, so encode */
SKP_assert( psEnc->state_Fxx[ 0 ].sCmn.inputBufIx == psEnc->state_Fxx[ 0 ].sCmn.frame_length );
SKP_assert( encControl->nChannels == 1 || psEnc->state_Fxx[ 1 ].sCmn.inputBufIx == psEnc->state_Fxx[ 1 ].sCmn.frame_length );
/* Deal with LBRR data */
if( psEnc->state_Fxx[ 0 ].sCmn.nFramesAnalyzed == 0 && !prefillFlag ) {
/* Create space at start of payload for VAD and FEC flags */
SKP_uint8 iCDF[ 2 ] = { 0, 0 };
iCDF[ 0 ] = 256 - SKP_RSHIFT( 256, ( psEnc->state_Fxx[ 0 ].sCmn.nFramesPerPacket + 1 ) * encControl->nChannels );
ec_enc_icdf( psRangeEnc, 0, iCDF, 8 );
/* Encode any LBRR data from previous packet */
/* Encode LBRR flags */
for( n = 0; n < encControl->nChannels; n++ ) {
LBRR_symbol = 0;
for( i = 0; i < psEnc->state_Fxx[ n ].sCmn.nFramesPerPacket; i++ ) {
LBRR_symbol |= SKP_LSHIFT( psEnc->state_Fxx[ n ].sCmn.LBRR_flags[ i ], i );
}
psEnc->state_Fxx[ n ].sCmn.LBRR_flag = LBRR_symbol > 0 ? 1 : 0;
if( LBRR_symbol && psEnc->state_Fxx[ n ].sCmn.nFramesPerPacket > 1 ) {
ec_enc_icdf( psRangeEnc, LBRR_symbol - 1, SKP_Silk_LBRR_flags_iCDF_ptr[ psEnc->state_Fxx[ n ].sCmn.nFramesPerPacket - 2 ], 8 );
}
}
/* Code LBRR indices and excitation signals */
for( i = 0; i < psEnc->state_Fxx[ 0 ].sCmn.nFramesPerPacket; i++ ) {
for( n = 0; n < encControl->nChannels; n++ ) {
if( psEnc->state_Fxx[ n ].sCmn.LBRR_flags[ i ] ) {
SKP_Silk_encode_indices( &psEnc->state_Fxx[ n ].sCmn, psRangeEnc, i, 1 );
SKP_Silk_encode_pulses( psRangeEnc, psEnc->state_Fxx[ n ].sCmn.indices_LBRR[i].signalType, psEnc->state_Fxx[ n ].sCmn.indices_LBRR[i].quantOffsetType,
psEnc->state_Fxx[ n ].sCmn.pulses_LBRR[ i ], psEnc->state_Fxx[ n ].sCmn.frame_length );
}
}
}
/* Reset LBRR flags */
for( n = 0; n < encControl->nChannels; n++ ) {
SKP_memset( psEnc->state_Fxx[ n ].sCmn.LBRR_flags, 0, sizeof( psEnc->state_Fxx[ n ].sCmn.LBRR_flags ) );
}
}
/* Convert Left/Right to Mid/Side */
if( encControl->nChannels == 2 ) {
SKP_Silk_stereo_LR_to_MS( &psEnc->sStereo, psEnc->state_Fxx[ 0 ].sCmn.inputBuf, psEnc->state_Fxx[ 1 ].sCmn.inputBuf,
&MS_predictorIx, psEnc->state_Fxx[ 0 ].sCmn.fs_kHz, psEnc->state_Fxx[ 0 ].sCmn.frame_length );
ec_enc_icdf( psRangeEnc, MS_predictorIx, SKP_Silk_stereo_predictor_iCDF, 8 );
}
/* Total target bits for packet */
nBits = SKP_DIV32_16( SKP_MUL( encControl->bitRate, encControl->payloadSize_ms ), 1000 );
/* Subtract bits already used */
nBits -= ec_tell( psRangeEnc );
/* Divide by number of uncoded frames left in packet */
nBits = SKP_DIV32_16( nBits, psEnc->state_Fxx[ 0 ].sCmn.nFramesPerPacket - psEnc->state_Fxx[ 0 ].sCmn.nFramesAnalyzed );
/* Convert to bits/second */
if( encControl->payloadSize_ms == 10 ) {
TargetRate_bps = SKP_SMULBB( nBits, 100 );
} else {
TargetRate_bps = SKP_SMULBB( nBits, 50 );
}
/* Subtract fraction of bits in excess of target in previous packets */
TargetRate_bps -= SKP_DIV32_16( SKP_MUL( psEnc->nBitsExceeded, 1000 ), BITRESERVOIR_DECAY_TIME_MS );
/* Don't exceed input bitrate */
TargetRate_bps = SKP_min( TargetRate_bps, encControl->bitRate );
/* Encode */
for( n = 0; n < encControl->nChannels; n++ ) {
/* For stereo coding, allocate 60% of the bitrate to mid and 40% to side */
if( encControl->nChannels == 1 ) {
channelRate_bps = TargetRate_bps;
} else if( n == 0 ) {
channelRate_bps = SKP_SMULWW( TargetRate_bps, SKP_FIX_CONST( 0.6, 16 ) );
} else {
channelRate_bps = SKP_SMULWB( TargetRate_bps, SKP_FIX_CONST( 0.4, 16 ) );
}
SKP_Silk_control_SNR( &psEnc->state_Fxx[ n ].sCmn, channelRate_bps );
//SKP_Silk_control_SNR( &psEnc->state_Fxx[ n ].sCmn, TargetRate_bps / 2 );
if( ( ret = SKP_Silk_encode_frame_Fxx( &psEnc->state_Fxx[ n ], nBytesOut, psRangeEnc ) ) != 0 ) {
SKP_assert( 0 );
}
psEnc->state_Fxx[ n ].sCmn.controlled_since_last_payload = 0;
psEnc->state_Fxx[ n ].sCmn.inputBufIx = 0;
}
/* Insert VAD and FEC flags at beginning of bitstream */
if( *nBytesOut > 0 ) {
flags = 0;
for( n = 0; n < encControl->nChannels; n++ ) {
for( i = 0; i < psEnc->state_Fxx[ n ].sCmn.nFramesPerPacket; i++ ) {
flags = SKP_LSHIFT( flags, 1 );
flags |= psEnc->state_Fxx[ n ].sCmn.VAD_flags[ i ];
}
flags = SKP_LSHIFT( flags, 1 );
flags |= psEnc->state_Fxx[ n ].sCmn.LBRR_flag;
}
ec_enc_patch_initial_bits( psRangeEnc, flags, ( psEnc->state_Fxx[ 0 ].sCmn.nFramesPerPacket + 1 ) * encControl->nChannels );
/* Return zero bytes if DTXed */
if( psEnc->state_Fxx[ 0 ].sCmn.inDTX && ( encControl->nChannels == 1 || psEnc->state_Fxx[ 1 ].sCmn.inDTX ) ) {
*nBytesOut = 0;
}
psEnc->nBitsExceeded += *nBytesOut * 8;
psEnc->nBitsExceeded -= SKP_DIV32_16( SKP_MUL( encControl->bitRate, encControl->payloadSize_ms ), 1000 );
psEnc->nBitsExceeded = SKP_LIMIT( psEnc->nBitsExceeded, 0, 10000 );
/* Update flag indicating if bandwidth switching is allowed */
speech_act_thr_for_switch_Q8 = SKP_SMLAWB( SKP_FIX_CONST( SPEECH_ACTIVITY_DTX_THRES, 8 ),
SKP_FIX_CONST( ( 1 - SPEECH_ACTIVITY_DTX_THRES ) / MAX_BANDWIDTH_SWITCH_DELAY_MS, 16 + 8 ), psEnc->timeSinceSwitchAllowed_ms );
if( psEnc->state_Fxx[ 0 ].sCmn.speech_activity_Q8 < speech_act_thr_for_switch_Q8 ) {
psEnc->allowBandwidthSwitch = 1;
psEnc->timeSinceSwitchAllowed_ms = 0;
} else {
psEnc->allowBandwidthSwitch = 0;
psEnc->timeSinceSwitchAllowed_ms += encControl->payloadSize_ms;
}
}
if( nSamplesIn == 0 ) {
break;
}
} else {
break;
}
}
encControl->allowBandwidthSwitch = psEnc->allowBandwidthSwitch;
encControl->inWBmodeWithoutVariableLP = ( psEnc->state_Fxx[ 0 ].sCmn.fs_kHz == 16 ) && ( psEnc->state_Fxx[ 0 ].sCmn.sLP.mode == 0 );
encControl->internalSampleRate = SKP_SMULBB( psEnc->state_Fxx[ 0 ].sCmn.fs_kHz, 1000 );
if( prefillFlag ) {
encControl->payloadSize_ms = tmp_payloadSize_ms;
encControl->complexity = tmp_complexity;
for( n = 0; n < encControl->nChannels; n++ ) {
psEnc->state_Fxx[ n ].sCmn.controlled_since_last_payload = 0;
psEnc->state_Fxx[ n ].sCmn.prefillFlag = 0;
}
}
return ret;
}