mirror of
https://github.com/mollyim/webrtc.git
synced 2025-05-13 22:00:47 +01:00
06c2aa9f7b
WebRTC internal code should always use include paths that start from the root of the project and that clearly identify the header file. This allows 'gn check' to actually keep dependencies under control because 'gn check' cannot enforce anything if the include path is not fully qualified (starting from the root of the project). Bug: webrtc:8815 Change-Id: I36f01784fa5f5b77eefc02db479b1f7f6ee1a8c3 Reviewed-on: https://webrtc-review.googlesource.com/46263 Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org> Cr-Commit-Position: refs/heads/master@{#21871}
81 lines
3.2 KiB
C
81 lines
3.2 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_CreateAugmentedVec.c
|
|
|
|
******************************************************************/
|
|
|
|
#include "modules/audio_coding/codecs/ilbc/defines.h"
|
|
#include "modules/audio_coding/codecs/ilbc/constants.h"
|
|
#include "rtc_base/sanitizer.h"
|
|
#include "common_audio/signal_processing/include/signal_processing_library.h"
|
|
|
|
/*----------------------------------------------------------------*
|
|
* Recreate a specific codebook vector from the augmented part.
|
|
*
|
|
*----------------------------------------------------------------*/
|
|
|
|
void WebRtcIlbcfix_CreateAugmentedVec(
|
|
size_t index, /* (i) Index for the augmented vector to be
|
|
created */
|
|
const int16_t* buffer, /* (i) Pointer to the end of the codebook memory
|
|
that is used for creation of the augmented
|
|
codebook */
|
|
int16_t* cbVec) { /* (o) The constructed codebook vector */
|
|
size_t ilow;
|
|
const int16_t *ppo, *ppi;
|
|
int16_t cbVecTmp[4];
|
|
/* Interpolation starts 4 elements before cbVec+index, but must not start
|
|
outside |cbVec|; clamping interp_len to stay within |cbVec|.
|
|
*/
|
|
size_t interp_len = WEBRTC_SPL_MIN(index, 4);
|
|
|
|
rtc_MsanCheckInitialized(buffer - index - interp_len, sizeof(buffer[0]),
|
|
index + interp_len);
|
|
|
|
ilow = index - interp_len;
|
|
|
|
/* copy the first noninterpolated part */
|
|
ppo = buffer-index;
|
|
WEBRTC_SPL_MEMCPY_W16(cbVec, ppo, index);
|
|
|
|
/* interpolation */
|
|
ppo = buffer - interp_len;
|
|
ppi = buffer - index - interp_len;
|
|
|
|
/* perform cbVec[ilow+k] = ((ppi[k]*alphaTbl[k])>>15) +
|
|
((ppo[k]*alphaTbl[interp_len-1-k])>>15);
|
|
for k = 0..interp_len-1
|
|
*/
|
|
WebRtcSpl_ElementwiseVectorMult(&cbVec[ilow], ppi, WebRtcIlbcfix_kAlpha,
|
|
interp_len, 15);
|
|
WebRtcSpl_ReverseOrderMultArrayElements(
|
|
cbVecTmp, ppo, &WebRtcIlbcfix_kAlpha[interp_len - 1], interp_len, 15);
|
|
WebRtcSpl_AddVectorsAndShift(&cbVec[ilow], &cbVec[ilow], cbVecTmp, interp_len,
|
|
0);
|
|
|
|
/* copy the second noninterpolated part */
|
|
ppo = buffer - index;
|
|
/* |tempbuff2| is declared in WebRtcIlbcfix_GetCbVec and is SUBL+5 elements
|
|
long. |buffer| points one element past the end of that vector, i.e., at
|
|
tempbuff2+SUBL+5. Since ppo=buffer-index, we cannot read any more than
|
|
|index| elements from |ppo|.
|
|
|
|
|cbVec| is declared to be SUBL elements long in WebRtcIlbcfix_CbConstruct.
|
|
Therefore, we can only write SUBL-index elements to cbVec+index.
|
|
|
|
These two conditions limit the number of elements to copy.
|
|
*/
|
|
WEBRTC_SPL_MEMCPY_W16(cbVec+index, ppo, WEBRTC_SPL_MIN(SUBL-index, index));
|
|
}
|