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annotate src/opus-1.3/silk/decode_frame.c @ 83:ae30d91d2ffe

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Replace these with versions built using an older toolset (so as to avoid ABI compatibilities when linking on Ubuntu 14.04 for packaging purposes)
author Chris Cannam
date Fri, 07 Feb 2020 11:51:13 +0000
parents 7aeed7906520
children
rev   line source
Chris@69 1 /***********************************************************************
Chris@69 2 Copyright (c) 2006-2011, Skype Limited. All rights reserved.
Chris@69 3 Redistribution and use in source and binary forms, with or without
Chris@69 4 modification, are permitted provided that the following conditions
Chris@69 5 are met:
Chris@69 6 - Redistributions of source code must retain the above copyright notice,
Chris@69 7 this list of conditions and the following disclaimer.
Chris@69 8 - Redistributions in binary form must reproduce the above copyright
Chris@69 9 notice, this list of conditions and the following disclaimer in the
Chris@69 10 documentation and/or other materials provided with the distribution.
Chris@69 11 - Neither the name of Internet Society, IETF or IETF Trust, nor the
Chris@69 12 names of specific contributors, may be used to endorse or promote
Chris@69 13 products derived from this software without specific prior written
Chris@69 14 permission.
Chris@69 15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
Chris@69 16 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
Chris@69 17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
Chris@69 18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
Chris@69 19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
Chris@69 20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
Chris@69 21 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
Chris@69 22 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
Chris@69 23 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
Chris@69 24 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
Chris@69 25 POSSIBILITY OF SUCH DAMAGE.
Chris@69 26 ***********************************************************************/
Chris@69 27
Chris@69 28 #ifdef HAVE_CONFIG_H
Chris@69 29 #include "config.h"
Chris@69 30 #endif
Chris@69 31
Chris@69 32 #include "main.h"
Chris@69 33 #include "stack_alloc.h"
Chris@69 34 #include "PLC.h"
Chris@69 35
Chris@69 36 /****************/
Chris@69 37 /* Decode frame */
Chris@69 38 /****************/
Chris@69 39 opus_int silk_decode_frame(
Chris@69 40 silk_decoder_state *psDec, /* I/O Pointer to Silk decoder state */
Chris@69 41 ec_dec *psRangeDec, /* I/O Compressor data structure */
Chris@69 42 opus_int16 pOut[], /* O Pointer to output speech frame */
Chris@69 43 opus_int32 *pN, /* O Pointer to size of output frame */
Chris@69 44 opus_int lostFlag, /* I 0: no loss, 1 loss, 2 decode fec */
Chris@69 45 opus_int condCoding, /* I The type of conditional coding to use */
Chris@69 46 int arch /* I Run-time architecture */
Chris@69 47 )
Chris@69 48 {
Chris@69 49 VARDECL( silk_decoder_control, psDecCtrl );
Chris@69 50 opus_int L, mv_len, ret = 0;
Chris@69 51 SAVE_STACK;
Chris@69 52
Chris@69 53 L = psDec->frame_length;
Chris@69 54 ALLOC( psDecCtrl, 1, silk_decoder_control );
Chris@69 55 psDecCtrl->LTP_scale_Q14 = 0;
Chris@69 56
Chris@69 57 /* Safety checks */
Chris@69 58 celt_assert( L > 0 && L <= MAX_FRAME_LENGTH );
Chris@69 59
Chris@69 60 if( lostFlag == FLAG_DECODE_NORMAL ||
Chris@69 61 ( lostFlag == FLAG_DECODE_LBRR && psDec->LBRR_flags[ psDec->nFramesDecoded ] == 1 ) )
Chris@69 62 {
Chris@69 63 VARDECL( opus_int16, pulses );
Chris@69 64 ALLOC( pulses, (L + SHELL_CODEC_FRAME_LENGTH - 1) &
Chris@69 65 ~(SHELL_CODEC_FRAME_LENGTH - 1), opus_int16 );
Chris@69 66 /*********************************************/
Chris@69 67 /* Decode quantization indices of side info */
Chris@69 68 /*********************************************/
Chris@69 69 silk_decode_indices( psDec, psRangeDec, psDec->nFramesDecoded, lostFlag, condCoding );
Chris@69 70
Chris@69 71 /*********************************************/
Chris@69 72 /* Decode quantization indices of excitation */
Chris@69 73 /*********************************************/
Chris@69 74 silk_decode_pulses( psRangeDec, pulses, psDec->indices.signalType,
Chris@69 75 psDec->indices.quantOffsetType, psDec->frame_length );
Chris@69 76
Chris@69 77 /********************************************/
Chris@69 78 /* Decode parameters and pulse signal */
Chris@69 79 /********************************************/
Chris@69 80 silk_decode_parameters( psDec, psDecCtrl, condCoding );
Chris@69 81
Chris@69 82 /********************************************************/
Chris@69 83 /* Run inverse NSQ */
Chris@69 84 /********************************************************/
Chris@69 85 silk_decode_core( psDec, psDecCtrl, pOut, pulses, arch );
Chris@69 86
Chris@69 87 /********************************************************/
Chris@69 88 /* Update PLC state */
Chris@69 89 /********************************************************/
Chris@69 90 silk_PLC( psDec, psDecCtrl, pOut, 0, arch );
Chris@69 91
Chris@69 92 psDec->lossCnt = 0;
Chris@69 93 psDec->prevSignalType = psDec->indices.signalType;
Chris@69 94 celt_assert( psDec->prevSignalType >= 0 && psDec->prevSignalType <= 2 );
Chris@69 95
Chris@69 96 /* A frame has been decoded without errors */
Chris@69 97 psDec->first_frame_after_reset = 0;
Chris@69 98 } else {
Chris@69 99 /* Handle packet loss by extrapolation */
Chris@69 100 psDec->indices.signalType = psDec->prevSignalType;
Chris@69 101 silk_PLC( psDec, psDecCtrl, pOut, 1, arch );
Chris@69 102 }
Chris@69 103
Chris@69 104 /*************************/
Chris@69 105 /* Update output buffer. */
Chris@69 106 /*************************/
Chris@69 107 celt_assert( psDec->ltp_mem_length >= psDec->frame_length );
Chris@69 108 mv_len = psDec->ltp_mem_length - psDec->frame_length;
Chris@69 109 silk_memmove( psDec->outBuf, &psDec->outBuf[ psDec->frame_length ], mv_len * sizeof(opus_int16) );
Chris@69 110 silk_memcpy( &psDec->outBuf[ mv_len ], pOut, psDec->frame_length * sizeof( opus_int16 ) );
Chris@69 111
Chris@69 112 /************************************************/
Chris@69 113 /* Comfort noise generation / estimation */
Chris@69 114 /************************************************/
Chris@69 115 silk_CNG( psDec, psDecCtrl, pOut, L );
Chris@69 116
Chris@69 117 /****************************************************************/
Chris@69 118 /* Ensure smooth connection of extrapolated and good frames */
Chris@69 119 /****************************************************************/
Chris@69 120 silk_PLC_glue_frames( psDec, pOut, L );
Chris@69 121
Chris@69 122 /* Update some decoder state variables */
Chris@69 123 psDec->lagPrev = psDecCtrl->pitchL[ psDec->nb_subfr - 1 ];
Chris@69 124
Chris@69 125 /* Set output frame length */
Chris@69 126 *pN = L;
Chris@69 127
Chris@69 128 RESTORE_STACK;
Chris@69 129 return ret;
Chris@69 130 }