mirror of
https://github.com/signalwire/freeswitch.git
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247 lines
11 KiB
C
247 lines
11 KiB
C
/***********************************************************************
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Copyright (c) 2006-2011, Skype Limited. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, (subject to the limitations in the disclaimer below)
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are permitted provided that the following conditions are met:
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- Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of Skype Limited, nor the names of specific
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contributors, may be used to endorse or promote products derived from
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this software without specific prior written permission.
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NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED
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BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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CONTRIBUTORS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
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BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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***********************************************************************/
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#include "SKP_Silk_define.h"
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#include "SKP_Silk_main_FIX.h"
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#include "SKP_Silk_SDK_API.h"
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#include "SKP_Silk_control.h"
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#include "SKP_Silk_typedef.h"
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#include "SKP_Silk_structs.h"
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#define SKP_Silk_EncodeControlStruct SKP_SILK_SDK_EncControlStruct
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/****************************************/
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/* Encoder functions */
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/****************************************/
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SKP_int SKP_Silk_SDK_Get_Encoder_Size( SKP_int32 *encSizeBytes )
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{
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SKP_int ret = 0;
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*encSizeBytes = sizeof( SKP_Silk_encoder_state_FIX );
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return ret;
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}
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/***************************************/
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/* Read control structure from encoder */
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/***************************************/
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SKP_int SKP_Silk_SDK_QueryEncoder(
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const void *encState, /* I: State Vector */
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SKP_Silk_EncodeControlStruct *encStatus /* O: Control Structure */
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)
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{
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SKP_Silk_encoder_state_FIX *psEnc;
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SKP_int ret = 0;
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psEnc = ( SKP_Silk_encoder_state_FIX* )encState;
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encStatus->API_sampleRate = psEnc->sCmn.API_fs_Hz;
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encStatus->maxInternalSampleRate = SKP_SMULBB( psEnc->sCmn.maxInternal_fs_kHz, 1000 );
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encStatus->packetSize = ( SKP_int )SKP_DIV32_16( psEnc->sCmn.API_fs_Hz * psEnc->sCmn.PacketSize_ms, 1000 ); /* convert samples -> ms */
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encStatus->bitRate = psEnc->sCmn.TargetRate_bps;
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encStatus->packetLossPercentage = psEnc->sCmn.PacketLoss_perc;
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encStatus->complexity = psEnc->sCmn.Complexity;
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encStatus->useInBandFEC = psEnc->sCmn.useInBandFEC;
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encStatus->useDTX = psEnc->sCmn.useDTX;
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return ret;
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}
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/*************************/
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/* Init or Reset encoder */
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/*************************/
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SKP_int SKP_Silk_SDK_InitEncoder(
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void *encState, /* I/O: State */
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SKP_Silk_EncodeControlStruct *encStatus /* O: Control structure */
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)
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{
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SKP_Silk_encoder_state_FIX *psEnc;
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SKP_int ret = 0;
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psEnc = ( SKP_Silk_encoder_state_FIX* )encState;
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/* Reset Encoder */
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if( ret += SKP_Silk_init_encoder_FIX( psEnc ) ) {
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SKP_assert( 0 );
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}
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/* Read control structure */
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if( ret += SKP_Silk_SDK_QueryEncoder( encState, encStatus ) ) {
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SKP_assert( 0 );
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}
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return ret;
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}
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/**************************/
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/* Encode frame with Silk */
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/**************************/
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SKP_int SKP_Silk_SDK_Encode(
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void *encState, /* I/O: State */
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const SKP_Silk_EncodeControlStruct *encControl, /* I: Control structure */
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const SKP_int16 *samplesIn, /* I: Speech sample input vector */
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SKP_int nSamplesIn, /* I: Number of samples in input vector */
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SKP_uint8 *outData, /* O: Encoded output vector */
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SKP_int16 *nBytesOut /* I/O: Number of bytes in outData (input: Max bytes) */
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)
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{
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SKP_int max_internal_fs_kHz, PacketSize_ms, PacketLoss_perc, UseInBandFEC, UseDTX, ret = 0;
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SKP_int nSamplesToBuffer, Complexity, input_10ms, nSamplesFromInput = 0;
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SKP_int32 TargetRate_bps, API_fs_Hz;
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SKP_int16 MaxBytesOut;
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SKP_Silk_encoder_state_FIX *psEnc = ( SKP_Silk_encoder_state_FIX* )encState;
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SKP_assert( encControl != NULL );
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/* Check sampling frequency first, to avoid divide by zero later */
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if( ( ( encControl->API_sampleRate != 8000 ) &&
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( encControl->API_sampleRate != 12000 ) &&
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( encControl->API_sampleRate != 16000 ) &&
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( encControl->API_sampleRate != 24000 ) &&
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( encControl->API_sampleRate != 32000 ) &&
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( encControl->API_sampleRate != 44100 ) &&
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( encControl->API_sampleRate != 48000 ) ) ||
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( ( encControl->maxInternalSampleRate != 8000 ) &&
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( encControl->maxInternalSampleRate != 12000 ) &&
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( encControl->maxInternalSampleRate != 16000 ) &&
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( encControl->maxInternalSampleRate != 24000 ) ) ) {
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ret = SKP_SILK_ENC_FS_NOT_SUPPORTED;
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SKP_assert( 0 );
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return( ret );
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}
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/* Set encoder parameters from control structure */
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API_fs_Hz = encControl->API_sampleRate;
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max_internal_fs_kHz = (SKP_int)( encControl->maxInternalSampleRate >> 10 ) + 1; /* convert Hz -> kHz */
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PacketSize_ms = SKP_DIV32( 1000 * (SKP_int)encControl->packetSize, API_fs_Hz );
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TargetRate_bps = encControl->bitRate;
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PacketLoss_perc = encControl->packetLossPercentage;
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UseInBandFEC = encControl->useInBandFEC;
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Complexity = encControl->complexity;
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UseDTX = encControl->useDTX;
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/* Save values in state */
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psEnc->sCmn.API_fs_Hz = API_fs_Hz;
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psEnc->sCmn.maxInternal_fs_kHz = max_internal_fs_kHz;
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psEnc->sCmn.useInBandFEC = UseInBandFEC;
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/* Only accept input lengths that are a multiple of 10 ms */
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input_10ms = SKP_DIV32( 100 * nSamplesIn, API_fs_Hz );
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if( input_10ms * API_fs_Hz != 100 * nSamplesIn || nSamplesIn < 0 ) {
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ret = SKP_SILK_ENC_INPUT_INVALID_NO_OF_SAMPLES;
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SKP_assert( 0 );
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return( ret );
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}
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TargetRate_bps = SKP_LIMIT( TargetRate_bps, MIN_TARGET_RATE_BPS, MAX_TARGET_RATE_BPS );
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if( ( ret = SKP_Silk_control_encoder_FIX( psEnc, PacketSize_ms, TargetRate_bps,
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PacketLoss_perc, UseDTX, Complexity) ) != 0 ) {
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SKP_assert( 0 );
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return( ret );
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}
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/* Make sure no more than one packet can be produced */
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if( 1000 * (SKP_int32)nSamplesIn > psEnc->sCmn.PacketSize_ms * API_fs_Hz ) {
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ret = SKP_SILK_ENC_INPUT_INVALID_NO_OF_SAMPLES;
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SKP_assert( 0 );
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return( ret );
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}
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#if MAX_FS_KHZ > 16
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/* Detect energy above 8 kHz */
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if( SKP_min( API_fs_Hz, 1000 * max_internal_fs_kHz ) == 24000 &&
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psEnc->sCmn.sSWBdetect.SWB_detected == 0 &&
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psEnc->sCmn.sSWBdetect.WB_detected == 0 ) {
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SKP_Silk_detect_SWB_input( &psEnc->sCmn.sSWBdetect, samplesIn, ( SKP_int )nSamplesIn );
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}
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#endif
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/* Input buffering/resampling and encoding */
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MaxBytesOut = 0; /* return 0 output bytes if no encoder called */
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while( 1 ) {
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nSamplesToBuffer = psEnc->sCmn.frame_length - psEnc->sCmn.inputBufIx;
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if( API_fs_Hz == SKP_SMULBB( 1000, psEnc->sCmn.fs_kHz ) ) {
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nSamplesToBuffer = SKP_min_int( nSamplesToBuffer, nSamplesIn );
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nSamplesFromInput = nSamplesToBuffer;
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/* Copy to buffer */
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SKP_memcpy( &psEnc->sCmn.inputBuf[ psEnc->sCmn.inputBufIx ], samplesIn, nSamplesFromInput * sizeof( SKP_int16 ) );
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} else {
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nSamplesToBuffer = SKP_min( nSamplesToBuffer, 10 * input_10ms * psEnc->sCmn.fs_kHz );
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nSamplesFromInput = SKP_DIV32_16( nSamplesToBuffer * API_fs_Hz, psEnc->sCmn.fs_kHz * 1000 );
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/* Resample and write to buffer */
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ret += SKP_Silk_resampler( &psEnc->sCmn.resampler_state,
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&psEnc->sCmn.inputBuf[ psEnc->sCmn.inputBufIx ], samplesIn, nSamplesFromInput );
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}
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samplesIn += nSamplesFromInput;
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nSamplesIn -= nSamplesFromInput;
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psEnc->sCmn.inputBufIx += nSamplesToBuffer;
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/* Silk encoder */
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if( psEnc->sCmn.inputBufIx >= psEnc->sCmn.frame_length ) {
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SKP_assert( psEnc->sCmn.inputBufIx == psEnc->sCmn.frame_length );
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/* Enough data in input buffer, so encode */
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if( MaxBytesOut == 0 ) {
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/* No payload obtained so far */
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MaxBytesOut = *nBytesOut;
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if( ( ret = SKP_Silk_encode_frame_FIX( psEnc, outData, &MaxBytesOut, psEnc->sCmn.inputBuf ) ) != 0 ) {
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SKP_assert( 0 );
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}
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} else {
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/* outData already contains a payload */
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if( ( ret = SKP_Silk_encode_frame_FIX( psEnc, outData, nBytesOut, psEnc->sCmn.inputBuf ) ) != 0 ) {
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SKP_assert( 0 );
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}
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/* Check that no second payload was created */
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SKP_assert( *nBytesOut == 0 );
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}
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psEnc->sCmn.inputBufIx = 0;
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psEnc->sCmn.controlled_since_last_payload = 0;
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if( nSamplesIn == 0 ) {
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break;
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}
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} else {
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break;
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}
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}
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*nBytesOut = MaxBytesOut;
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if( psEnc->sCmn.useDTX && psEnc->sCmn.inDTX ) {
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/* DTX simulation */
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*nBytesOut = 0;
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}
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return ret;
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}
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