1 /*
2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11
12 #include "pcm16b.h"
13
14 #include <stdlib.h>
15
16 #include "typedefs.h"
17
18 #ifdef WEBRTC_ARCH_BIG_ENDIAN
19 #include "signal_processing_library.h"
20 #endif
21
22 #define HIGHEND 0xFF00
23 #define LOWEND 0xFF
24
25
26
27 /* Encoder with int16_t Output */
WebRtcPcm16b_EncodeW16(int16_t * speechIn16b,int16_t len,int16_t * speechOut16b)28 int16_t WebRtcPcm16b_EncodeW16(int16_t *speechIn16b,
29 int16_t len,
30 int16_t *speechOut16b)
31 {
32 #ifdef WEBRTC_ARCH_BIG_ENDIAN
33 WEBRTC_SPL_MEMCPY_W16(speechOut16b, speechIn16b, len);
34 #else
35 int i;
36 for (i=0;i<len;i++) {
37 speechOut16b[i]=(((uint16_t)speechIn16b[i])>>8)|((((uint16_t)speechIn16b[i])<<8)&0xFF00);
38 }
39 #endif
40 return(len<<1);
41 }
42
43
44 /* Encoder with char Output (old version) */
WebRtcPcm16b_Encode(int16_t * speech16b,int16_t len,unsigned char * speech8b)45 int16_t WebRtcPcm16b_Encode(int16_t *speech16b,
46 int16_t len,
47 unsigned char *speech8b)
48 {
49 int16_t samples=len*2;
50 int16_t pos;
51 int16_t short1;
52 int16_t short2;
53 for (pos=0;pos<len;pos++) {
54 short1=HIGHEND & speech16b[pos];
55 short2=LOWEND & speech16b[pos];
56 short1=short1>>8;
57 speech8b[pos*2]=(unsigned char) short1;
58 speech8b[pos*2+1]=(unsigned char) short2;
59 }
60 return(samples);
61 }
62
63
64 /* Decoder with int16_t Input instead of char when the int16_t Encoder is used */
WebRtcPcm16b_DecodeW16(void * inst,int16_t * speechIn16b,int16_t len,int16_t * speechOut16b,int16_t * speechType)65 int16_t WebRtcPcm16b_DecodeW16(void *inst,
66 int16_t *speechIn16b,
67 int16_t len,
68 int16_t *speechOut16b,
69 int16_t* speechType)
70 {
71 #ifdef WEBRTC_ARCH_BIG_ENDIAN
72 WEBRTC_SPL_MEMCPY_W8(speechOut16b, speechIn16b, ((len*sizeof(int16_t)+1)>>1));
73 #else
74 int i;
75 int samples=len>>1;
76
77 for (i=0;i<samples;i++) {
78 speechOut16b[i]=(((uint16_t)speechIn16b[i])>>8)|(((uint16_t)(speechIn16b[i]&0xFF))<<8);
79 }
80 #endif
81
82 *speechType=1;
83
84 // Avoid warning.
85 (void)(inst = NULL);
86
87 return(len>>1);
88 }
89
90 /* "old" version of the decoder that uses char as input (not used in NetEq any more) */
WebRtcPcm16b_Decode(unsigned char * speech8b,int16_t len,int16_t * speech16b)91 int16_t WebRtcPcm16b_Decode(unsigned char *speech8b,
92 int16_t len,
93 int16_t *speech16b)
94 {
95 int16_t samples=len>>1;
96 int16_t pos;
97 int16_t shortval;
98 for (pos=0;pos<samples;pos++) {
99 shortval=((unsigned short) speech8b[pos*2]);
100 shortval=(shortval<<8)&HIGHEND;
101 shortval=shortval|(((unsigned short) speech8b[pos*2+1])&LOWEND);
102 speech16b[pos]=shortval;
103 }
104 return(samples);
105 }
106