mirror of
https://github.com/mollyim/webrtc.git
synced 2025-05-13 22:00:47 +01:00
3111783aa1
Prior to this commit, most .c files in modules/audio_coding/codecs/ilbc don't include their corresponding headers, nor do they order #includes as per the Google Style Guide [1]. The former is especially harmful, since in C it can silently allow the function signature to diverge from its prototype, thus causing disaster at runtime. This CL fixes both issues. In effect, this allows the common_audio and modules/audio_coding:ilbc targets to be compiled with Clang's -Wmissing-prototypes, though this CL does not add that change. [1]: https://google.github.io/styleguide/cppguide.html#Names_and_Order_of_Includes Bug: webrtc:12314 Change-Id: I8299968ed3cc86ff35d9de045072b846298043af Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/198362 Reviewed-by: Henrik Lundin <henrik.lundin@webrtc.org> Commit-Queue: Timothy Gu <timothygu@chromium.org> Cr-Commit-Position: refs/heads/master@{#32896}
88 lines
2.3 KiB
C
88 lines
2.3 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_Lsf2Poly.c
|
|
|
|
******************************************************************/
|
|
|
|
#include "modules/audio_coding/codecs/ilbc/lsf_to_poly.h"
|
|
|
|
#include "modules/audio_coding/codecs/ilbc/constants.h"
|
|
#include "modules/audio_coding/codecs/ilbc/defines.h"
|
|
#include "modules/audio_coding/codecs/ilbc/get_lsp_poly.h"
|
|
#include "modules/audio_coding/codecs/ilbc/lsf_to_lsp.h"
|
|
|
|
void WebRtcIlbcfix_Lsf2Poly(
|
|
int16_t *a, /* (o) predictor coefficients (order = 10) in Q12 */
|
|
int16_t *lsf /* (i) line spectral frequencies in Q13 */
|
|
) {
|
|
int32_t f[2][6]; /* f[0][] and f[1][] corresponds to
|
|
F1(z) and F2(z) respectivly */
|
|
int32_t *f1ptr, *f2ptr;
|
|
int16_t *a1ptr, *a2ptr;
|
|
int32_t tmpW32;
|
|
int16_t lsp[10];
|
|
int i;
|
|
|
|
/* Convert lsf to lsp */
|
|
WebRtcIlbcfix_Lsf2Lsp(lsf, lsp, LPC_FILTERORDER);
|
|
|
|
/* Get F1(z) and F2(z) from the lsp */
|
|
f1ptr=f[0];
|
|
f2ptr=f[1];
|
|
WebRtcIlbcfix_GetLspPoly(&lsp[0],f1ptr);
|
|
WebRtcIlbcfix_GetLspPoly(&lsp[1],f2ptr);
|
|
|
|
/* for i = 5 down to 1
|
|
Compute f1[i] += f1[i-1];
|
|
and f2[i] += f2[i-1];
|
|
*/
|
|
f1ptr=&f[0][5];
|
|
f2ptr=&f[1][5];
|
|
for (i=5; i>0; i--)
|
|
{
|
|
(*f1ptr) += (*(f1ptr-1));
|
|
(*f2ptr) -= (*(f2ptr-1));
|
|
f1ptr--;
|
|
f2ptr--;
|
|
}
|
|
|
|
/* Get the A(z) coefficients
|
|
a[0] = 1.0
|
|
for i = 1 to 5
|
|
a[i] = (f1[i] + f2[i] + round)>>13;
|
|
for i = 1 to 5
|
|
a[11-i] = (f1[i] - f2[i] + round)>>13;
|
|
*/
|
|
a[0]=4096;
|
|
a1ptr=&a[1];
|
|
a2ptr=&a[10];
|
|
f1ptr=&f[0][1];
|
|
f2ptr=&f[1][1];
|
|
for (i=5; i>0; i--)
|
|
{
|
|
tmpW32 = (*f1ptr) + (*f2ptr);
|
|
*a1ptr = (int16_t)((tmpW32 + 4096) >> 13);
|
|
|
|
tmpW32 = (*f1ptr) - (*f2ptr);
|
|
*a2ptr = (int16_t)((tmpW32 + 4096) >> 13);
|
|
|
|
a1ptr++;
|
|
a2ptr--;
|
|
f1ptr++;
|
|
f2ptr++;
|
|
}
|
|
|
|
return;
|
|
}
|