81 lines
2.9 KiB
C
81 lines
2.9 KiB
C
/*
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* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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/******************************************************************
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iLBC Speech Coder ANSI-C Source Code
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WebRtcIlbcfix_CbConstruct.c
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******************************************************************/
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#include "modules/audio_coding/codecs/ilbc/cb_construct.h"
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#include "modules/audio_coding/codecs/ilbc/defines.h"
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#include "modules/audio_coding/codecs/ilbc/gain_dequant.h"
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#include "modules/audio_coding/codecs/ilbc/get_cd_vec.h"
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#include "rtc_base/sanitizer.h"
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// An arithmetic operation that is allowed to overflow. (It's still undefined
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// behavior, so not a good idea; this just makes UBSan ignore the violation, so
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// that our old code can continue to do what it's always been doing.)
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static inline int32_t RTC_NO_SANITIZE("signed-integer-overflow")
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OverflowingAddS32S32ToS32(int32_t a, int32_t b) {
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return a + b;
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}
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/*----------------------------------------------------------------*
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* Construct decoded vector from codebook and gains.
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*---------------------------------------------------------------*/
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bool WebRtcIlbcfix_CbConstruct(
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int16_t* decvector, /* (o) Decoded vector */
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const int16_t* index, /* (i) Codebook indices */
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const int16_t* gain_index, /* (i) Gain quantization indices */
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int16_t* mem, /* (i) Buffer for codevector construction */
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size_t lMem, /* (i) Length of buffer */
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size_t veclen) { /* (i) Length of vector */
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size_t j;
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int16_t gain[CB_NSTAGES];
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/* Stack based */
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int16_t cbvec0[SUBL];
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int16_t cbvec1[SUBL];
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int16_t cbvec2[SUBL];
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int32_t a32;
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int16_t *gainPtr;
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/* gain de-quantization */
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gain[0] = WebRtcIlbcfix_GainDequant(gain_index[0], 16384, 0);
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gain[1] = WebRtcIlbcfix_GainDequant(gain_index[1], gain[0], 1);
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gain[2] = WebRtcIlbcfix_GainDequant(gain_index[2], gain[1], 2);
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/* codebook vector construction and construction of total vector */
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/* Stack based */
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if (!WebRtcIlbcfix_GetCbVec(cbvec0, mem, (size_t)index[0], lMem, veclen))
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return false; // Failure.
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if (!WebRtcIlbcfix_GetCbVec(cbvec1, mem, (size_t)index[1], lMem, veclen))
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return false; // Failure.
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if (!WebRtcIlbcfix_GetCbVec(cbvec2, mem, (size_t)index[2], lMem, veclen))
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return false; // Failure.
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gainPtr = &gain[0];
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for (j=0;j<veclen;j++) {
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a32 = (*gainPtr++) * cbvec0[j];
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a32 += (*gainPtr++) * cbvec1[j];
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a32 = OverflowingAddS32S32ToS32(a32, (*gainPtr) * cbvec2[j]);
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gainPtr -= 2;
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decvector[j] = (int16_t)((a32 + 8192) >> 14);
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}
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return true; // Success.
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}
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