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- /***********************************************************************
- Copyright (c) 2006-2011, Skype Limited. All rights reserved.
- Redistribution and use in source and binary forms, with or without
- modification, 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 Internet Society, IETF or IETF Trust, nor the
- names of specific contributors, may be used to endorse or promote
- products derived from this software without specific prior written
- permission.
- 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 FITNESS FOR A PARTICULAR PURPOSE
- ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- POSSIBILITY OF SUCH DAMAGE.
- ***********************************************************************/
- #ifdef HAVE_CONFIG_H
- #include "config.h"
- #endif
- #include "main.h"
- #include "stack_alloc.h"
- #include "PLC.h"
- /****************/
- /* Decode frame */
- /****************/
- opus_int silk_decode_frame(
- silk_decoder_state *psDec, /* I/O Pointer to Silk decoder state */
- ec_dec *psRangeDec, /* I/O Compressor data structure */
- opus_int16 pOut[], /* O Pointer to output speech frame */
- opus_int32 *pN, /* O Pointer to size of output frame */
- opus_int lostFlag, /* I 0: no loss, 1 loss, 2 decode fec */
- opus_int condCoding, /* I The type of conditional coding to use */
- int arch /* I Run-time architecture */
- )
- {
- VARDECL( silk_decoder_control, psDecCtrl );
- opus_int L, mv_len, ret = 0;
- SAVE_STACK;
- L = psDec->frame_length;
- ALLOC( psDecCtrl, 1, silk_decoder_control );
- psDecCtrl->LTP_scale_Q14 = 0;
- /* Safety checks */
- celt_assert( L > 0 && L <= MAX_FRAME_LENGTH );
- if( lostFlag == FLAG_DECODE_NORMAL ||
- ( lostFlag == FLAG_DECODE_LBRR && psDec->LBRR_flags[ psDec->nFramesDecoded ] == 1 ) )
- {
- VARDECL( opus_int16, pulses );
- ALLOC( pulses, (L + SHELL_CODEC_FRAME_LENGTH - 1) &
- ~(SHELL_CODEC_FRAME_LENGTH - 1), opus_int16 );
- /*********************************************/
- /* Decode quantization indices of side info */
- /*********************************************/
- silk_decode_indices( psDec, psRangeDec, psDec->nFramesDecoded, lostFlag, condCoding );
- /*********************************************/
- /* Decode quantization indices of excitation */
- /*********************************************/
- silk_decode_pulses( psRangeDec, pulses, psDec->indices.signalType,
- psDec->indices.quantOffsetType, psDec->frame_length );
- /********************************************/
- /* Decode parameters and pulse signal */
- /********************************************/
- silk_decode_parameters( psDec, psDecCtrl, condCoding );
- /********************************************************/
- /* Run inverse NSQ */
- /********************************************************/
- silk_decode_core( psDec, psDecCtrl, pOut, pulses, arch );
- /********************************************************/
- /* Update PLC state */
- /********************************************************/
- silk_PLC( psDec, psDecCtrl, pOut, 0, arch );
- psDec->lossCnt = 0;
- psDec->prevSignalType = psDec->indices.signalType;
- celt_assert( psDec->prevSignalType >= 0 && psDec->prevSignalType <= 2 );
- /* A frame has been decoded without errors */
- psDec->first_frame_after_reset = 0;
- } else {
- /* Handle packet loss by extrapolation */
- silk_PLC( psDec, psDecCtrl, pOut, 1, arch );
- }
- /*************************/
- /* Update output buffer. */
- /*************************/
- celt_assert( psDec->ltp_mem_length >= psDec->frame_length );
- mv_len = psDec->ltp_mem_length - psDec->frame_length;
- silk_memmove( psDec->outBuf, &psDec->outBuf[ psDec->frame_length ], mv_len * sizeof(opus_int16) );
- silk_memcpy( &psDec->outBuf[ mv_len ], pOut, psDec->frame_length * sizeof( opus_int16 ) );
- /************************************************/
- /* Comfort noise generation / estimation */
- /************************************************/
- silk_CNG( psDec, psDecCtrl, pOut, L );
- /****************************************************************/
- /* Ensure smooth connection of extrapolated and good frames */
- /****************************************************************/
- silk_PLC_glue_frames( psDec, pOut, L );
- /* Update some decoder state variables */
- psDec->lagPrev = psDecCtrl->pitchL[ psDec->nb_subfr - 1 ];
- /* Set output frame length */
- *pN = L;
- RESTORE_STACK;
- return ret;
- }
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