ref: fcf95bac9330e8e6db1184496ae33007a7c7a9cf
dir: /src_common/SKP_Silk_enc_API.c/
/***********************************************************************
Copyright (c) 2006-2011, 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:
- Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
- Neither the name of Skype Limited, nor the names of specific
contributors, may be used to endorse or promote products derived from
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
CONTRIBUTORS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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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_define.h"
#include "SKP_Silk_SDK_API.h"
#include "SKP_Silk_control.h"
#include "SKP_Silk_typedef.h"
#include "SKP_Silk_structs.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_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->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_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 ) ) != 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;
/* 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 );
}
if( nSamplesIn == 0 ) {
break;
}
} else {
break;
}
}
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;
}