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https://github.com/xiph/opus.git
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6f2d9f5068
This allows the decoder to be compiled with NONTHREADSAFE_PSEUDOSTACK to move the memory for large buffers off the stack for devices where it is very limited. This patch only attempts to do this for the decoder. The encoder still requires more than 10 kB of stack.
128 lines
5.8 KiB
C
128 lines
5.8 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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)
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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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VARDECL( opus_int, pulses );
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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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ALLOC( pulses, (L + SHELL_CODEC_FRAME_LENGTH - 1) &
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~(SHELL_CODEC_FRAME_LENGTH - 1), opus_int );
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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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/*********************************************/
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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 );
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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 );
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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 );
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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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/* 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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/************************************************/
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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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/* 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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