mirror of
https://github.com/mollyim/webrtc.git
synced 2025-05-13 22:00:47 +01:00
d00ce747c7
Bug: webrtc:12338 Change-Id: I02613d9fca45d00e2477f334b7a0416e7912e26b Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/227037 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Artem Titov <titovartem@webrtc.org> Cr-Commit-Position: refs/heads/master@{#34621}
126 lines
3.7 KiB
C
126 lines
3.7 KiB
C
/*
|
|
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license
|
|
* that can be found in the LICENSE file in the root of the source
|
|
* tree. An additional intellectual property rights grant can be found
|
|
* in the file PATENTS. All contributing project authors may
|
|
* be found in the AUTHORS file in the root of the source tree.
|
|
*/
|
|
|
|
/******************************************************************
|
|
|
|
iLBC Speech Coder ANSI-C Source Code
|
|
|
|
WebRtcIlbcfix_GetCbVec.c
|
|
|
|
******************************************************************/
|
|
|
|
#include "modules/audio_coding/codecs/ilbc/get_cd_vec.h"
|
|
|
|
#include "modules/audio_coding/codecs/ilbc/constants.h"
|
|
#include "modules/audio_coding/codecs/ilbc/create_augmented_vec.h"
|
|
#include "modules/audio_coding/codecs/ilbc/defines.h"
|
|
|
|
/*----------------------------------------------------------------*
|
|
* Construct codebook vector for given index.
|
|
*---------------------------------------------------------------*/
|
|
|
|
bool WebRtcIlbcfix_GetCbVec(
|
|
int16_t *cbvec, /* (o) Constructed codebook vector */
|
|
int16_t *mem, /* (i) Codebook buffer */
|
|
size_t index, /* (i) Codebook index */
|
|
size_t lMem, /* (i) Length of codebook buffer */
|
|
size_t cbveclen /* (i) Codebook vector length */
|
|
){
|
|
size_t k, base_size;
|
|
size_t lag;
|
|
/* Stack based */
|
|
int16_t tempbuff2[SUBL+5];
|
|
|
|
/* Determine size of codebook sections */
|
|
|
|
base_size=lMem-cbveclen+1;
|
|
|
|
if (cbveclen==SUBL) {
|
|
base_size += cbveclen / 2;
|
|
}
|
|
|
|
/* No filter -> First codebook section */
|
|
|
|
if (index<lMem-cbveclen+1) {
|
|
|
|
/* first non-interpolated vectors */
|
|
|
|
k=index+cbveclen;
|
|
/* get vector */
|
|
WEBRTC_SPL_MEMCPY_W16(cbvec, mem+lMem-k, cbveclen);
|
|
|
|
} else if (index < base_size) {
|
|
|
|
/* Calculate lag */
|
|
|
|
k = (2 * (index - (lMem - cbveclen + 1))) + cbveclen;
|
|
|
|
lag = k / 2;
|
|
|
|
WebRtcIlbcfix_CreateAugmentedVec(lag, mem+lMem, cbvec);
|
|
|
|
}
|
|
|
|
/* Higher codebbok section based on filtering */
|
|
|
|
else {
|
|
|
|
size_t memIndTest;
|
|
|
|
/* first non-interpolated vectors */
|
|
|
|
if (index-base_size<lMem-cbveclen+1) {
|
|
|
|
/* Set up filter memory, stuff zeros outside memory buffer */
|
|
|
|
memIndTest = lMem-(index-base_size+cbveclen);
|
|
|
|
WebRtcSpl_MemSetW16(mem-CB_HALFFILTERLEN, 0, CB_HALFFILTERLEN);
|
|
WebRtcSpl_MemSetW16(mem+lMem, 0, CB_HALFFILTERLEN);
|
|
|
|
/* do filtering to get the codebook vector */
|
|
|
|
WebRtcSpl_FilterMAFastQ12(
|
|
&mem[memIndTest+4], cbvec, (int16_t*)WebRtcIlbcfix_kCbFiltersRev,
|
|
CB_FILTERLEN, cbveclen);
|
|
}
|
|
|
|
/* interpolated vectors */
|
|
|
|
else {
|
|
if (cbveclen < SUBL) {
|
|
// We're going to fill in cbveclen + 5 elements of tempbuff2 in
|
|
// WebRtcSpl_FilterMAFastQ12, less than the SUBL + 5 elements we'll be
|
|
// using in WebRtcIlbcfix_CreateAugmentedVec. This error is caused by
|
|
// bad values in `index` (which come from the encoded stream). Tell the
|
|
// caller that things went south, and that the decoder state is now
|
|
// corrupt (because it's half-way through an update that we can't
|
|
// complete).
|
|
return false;
|
|
}
|
|
|
|
/* Stuff zeros outside memory buffer */
|
|
memIndTest = lMem-cbveclen-CB_FILTERLEN;
|
|
WebRtcSpl_MemSetW16(mem+lMem, 0, CB_HALFFILTERLEN);
|
|
|
|
/* do filtering */
|
|
WebRtcSpl_FilterMAFastQ12(
|
|
&mem[memIndTest+7], tempbuff2, (int16_t*)WebRtcIlbcfix_kCbFiltersRev,
|
|
CB_FILTERLEN, cbveclen+5);
|
|
|
|
/* Calculate lag index */
|
|
lag = (cbveclen<<1)-20+index-base_size-lMem-1;
|
|
|
|
WebRtcIlbcfix_CreateAugmentedVec(lag, tempbuff2+SUBL+5, cbvec);
|
|
}
|
|
}
|
|
|
|
return true; // Success.
|
|
}
|