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